Merge branch 'feat/vendor-stash'

src/baker/packers/pack-canonical-tbl.ts

@@ -377,6 +377,22 @@ async function main() {
     'bank',
     'stash',
     'strGoldInStash',
+    // NPC store / stash / gold dialog (D2Client store tooltips, 0x2A NPCTransaction replies, gold dialog)
+    'cost',
+    'Repair',
+    'Sell',
+    'TransactionResults4',
+    'TransactionResults5',
+    'TransactionResults6',
+    'TransactionResults8',
+    'TransactionResults9',
+    'TransactionResults10',
+    'TransactionResults11',
+    'ok',
+    'strDropGoldHowMuch',
+    'strBankGoldDeposit',
+    'strBankGoldWithdraw',
+    'Back',
     'box',
     'strUiMenu2',
     'strClose',
@@ -524,6 +540,20 @@ async function main() {
   }
   chiOut['strethereal'] = EXPANSION_CHI_FALLBACKS['strethereal']!
 
+  // Index-only patchstring.tbl entries. Their real key is the placeholder "x", shared by ~100 patchstring
+  // entries (decodeTbl keeps the first duplicate), so D2Client looks them up by string index instead
+  // (patchstring index n = global tbl index 10000 + n). They are emitted from the MPQ under the alias
+  // key `patchstring#<n>`.
+  //   - 95: Repair All button hover text "Repair all equipment: %d" (D2Client string index 10095)
+  for (const idx of [95]) {
+    const alias = `patchstring#${idx}`
+    const ev = eng.tables[0]?.[idx]
+    const cv = chi.tables[0]?.[idx]
+    if (ev === undefined || cv === undefined) throw new Error(`patchstring.tbl index ${idx} missing (ENG or CHI)`)
+    engOut[alias] = ev
+    chiOut[alias] = cv
+  }
+
   const outPath = path.join(process.cwd(), 'src/common/data/canonical-tbl-strings.ts')
   const fileContent = `/**
  * AUTO-GENERATED by \`src/baker/packers/pack-canonical-tbl.ts\` from authoritative 1.13c MPQ archives:

src/client/i18n/lang.ts

@@ -19,6 +19,13 @@ export function lookupTbl(key: string, lang: TblLang = getTblLang()): string | u
   return resolveTblKey(key, lang)
 }
 
+/** Packed tbl string for `key`; throws when the key is not in the packed canonical dictionary. */
+export function requireTbl(key: string, lang: TblLang): string {
+  const v = resolveTblKey(key, lang)
+  if (v === undefined) throw new Error(`tbl key "${key}" is not packed (src/baker/packers/pack-canonical-tbl.ts)`)
+  return v
+}
+
 let overrideLang: GameLang | null = null
 const listeners = new Set<(lang: TblLang) => void>()
 const gameLangListeners = new Set<(lang: GameLang) => void>()

src/client/session/online-session.ts

@@ -57,6 +57,7 @@ import {
   type SettingsStore,
 } from '../settings/settings-store.ts'
 import { HudModel } from '../ui-model/hud-model.ts'
+import { vendorPrice113c, vendorRepairAll113c } from '../ui-model/vendor-price.ts'
 import { ClientWorldSceneSource } from '../view/scene-source.ts'
 import type { RenderableUnitInput } from '../view/unit-drawables.ts'
 import { getViewportProfile } from '../view/viewport-profile.ts'
@@ -249,6 +250,11 @@ export class OnlineSession {
       onCommand: (cmd) => {
         this.dispatchCommand(cmd)
       },
+      vendorPrice: vendorPrice113c,
+      vendorRepairAll: vendorRepairAll113c,
+      playUiSound: (soundId) => {
+        this.soundService.playSoundById(soundId)
+      },
     })
 
     this.commandMapper = new CommandMapper({
@@ -700,6 +706,7 @@ export class OnlineSession {
     if (this.gameAdapter && this.gameAdapter.state !== 'closed') {
       try {
         this.gameAdapter.send(cmd)
+        this.world.noteOutgoingCommand(cmd)
       } catch (err) {
         const msg = err instanceof Error ? err.message : String(err)
         this.handleUnexpectedDisconnect(`Failed to send command ${cmd.type}: ${msg}`)

src/client/ui-model/hud-model.ts

@@ -13,6 +13,7 @@ import { SKILLS_BY_ID } from '../../common/data/skills-catalog.ts'
 import type { CharacterClassCode } from '../../common/units/classes.ts'
 import { monsterDisplayName } from '../../common/units/monsters-data.ts'
 import { calculateManaCost } from '../../common/skills/skill-calc-engine.ts'
+import { ClickButtonId } from '../../netproto/index.ts'
 import type {
   CharClassId,
   ClientCommand,
@@ -32,11 +33,14 @@ import {
   type UiInventoryItem,
   type UiItemQuality,
 } from '../ui/inventory.ts'
-import type { MonsterTargetHudInfo } from '../ui/world-panels.ts'
+import { GAMBLE_NPC_CLASS_IDS, type MonsterTargetHudInfo } from '../ui/world-panels.ts'
+import { requireTbl } from '../i18n/lang.ts'
+import { getTownNpcDescriptorByHcIdx, type TownNpcServiceDescriptor } from '../../common/units/npc-table.ts'
+import type { VendorPriceContext, VendorPriceFn, VendorRepairAllFn } from './vendor-price.ts'
 import type { AutomapView } from '../automap/automap-view.ts'
 import type { LocalMovementPredictor } from '../motion/predictor.ts'
 import type { ClientUnit } from '../world/client-unit.ts'
-import type { ClientWorld } from '../world/client-world.ts'
+import type { ClientWorld, NpcInteractionState } from '../world/client-world.ts'
 import { D2StatId } from '../world/stat-list.ts'
 import { D2_EXPERIENCE_TABLE_99 } from '../../common/skills/formulas.ts'
 import { computeCharacterSheetDerived } from './derived-stats.ts'
@@ -172,8 +176,55 @@ export interface HudModelOptions {
   readonly predictor?: LocalMovementPredictor | null | undefined
   readonly automap?: AutomapView | null | undefined
   readonly onCommand?: ((cmd: ClientCommand) => void) | undefined
+  /** Store price provider (D2Common #10107); required before a store opens. Production: `vendorPrice113c`. */
+  readonly vendorPrice?: VendorPriceFn | undefined
+  /** Repair-all cost provider (D2Common #10071); required before a store opens. Production: `vendorRepairAll113c`. */
+  readonly vendorRepairAll?: VendorRepairAllFn | undefined
+  /** UI sound sink (sell sound 0xdd); required before a store opens. */
+  readonly playUiSound?: ((soundId: number) => void) | undefined
+  /** Clock for the store click throttle (ms); defaults to `performance.now`. */
+  readonly now?: (() => number) | undefined
 }
 
+/** D2Client store click throttle: one buy / sell / repair request per action every 2000 ms. */
+export const NPC_TRADE_THROTTLE_MS = 2000
+
+/**
+ * S2C `0x2A` NPCTransaction result -> `string.tbl` key of the message D2Client shows (indices 3356..3363).
+ * Results 0 (buy), 1 (sell) and 2 (repair all) succeed silently; any other unknown code shows TransactionResults9.
+ */
+export function npcTransactionMessageKey(result: number): string | null {
+  switch (result) {
+    case 0:
+    case 1:
+    case 2:
+      return null
+    case 7:
+    case 8:
+      return 'TransactionResults6' // 3358
+    case 10:
+      return 'TransactionResults4' // 3356
+    case 11:
+      return 'TransactionResults8' // 3360
+    case 12:
+      return 'TransactionResults10' // 3362
+    case 15:
+      return 'TransactionResults11' // 3363
+    case 16:
+      return 'TransactionResults5' // 3357
+    default:
+      return 'TransactionResults9' // 3361
+  }
+}
+
+/** Sound D2Client plays on a successful sell (S2C 0x2A result 1). */
+export const NPC_SELL_SOUND_ID = 0xdd
+
+/** `UnitType` id of monsters / NPCs in `UnitRef`. */
+const UNIT_TYPE_MONSTER = 1
+
+const NPC_STATE_CLOSED: NpcInteractionState = { npcId: null, window: 'none', stashOpen: false }
+
 export interface HudModelSnapshot {
   readonly charName: string
   /** `null` until the server assigns the class (MCP char list / `0x59` UnitAssign). */
@@ -223,6 +274,17 @@ export class HudModel implements HudCommandSink {
   private unsubWorld: (() => void) | null = null
   private hoveredMonsterId: number | null = null
   private escapeMenuOpen = false
+  private readonly priceProvider: VendorPriceFn | null
+  private readonly repairAllProvider: VendorRepairAllFn | null
+  private readonly uiSound: ((soundId: number) => void) | null
+  private readonly now: () => number
+  /** NPC/stash state seen by the last sync; panels react to transitions only. */
+  private prevNpc: NpcInteractionState = NPC_STATE_CLOSED
+  /** `lastNpcTransaction.seq` already reacted to (each S2C 0x2A is shown once). */
+  private handledNpcTransactionSeq: number
+  private readonly lastNpcActionAt = new Map<string, number>()
+  /** Message shown for the last non-success S2C 0x2A (string.tbl index + localized text). */
+  lastNpcTransactionMessage: { readonly tblKey: string; readonly text: string } | null = null
 
   constructor(options: HudModelOptions) {
     this.world = options.world
@@ -230,6 +292,11 @@ export class HudModel implements HudCommandSink {
     this.predictor = options.predictor ?? null
     this.automap = options.automap ?? null
     this.onCommand = options.onCommand
+    this.priceProvider = options.vendorPrice ?? null
+    this.repairAllProvider = options.vendorRepairAll ?? null
+    this.uiSound = options.playUiSound ?? null
+    this.now = options.now ?? (() => performance.now())
+    this.handledNpcTransactionSeq = this.world.lastNpcTransaction?.seq ?? 0
     if (this.hudManager) this.hudManager.commandSink = this
 
     this.unsubWorld = this.world.onChange(() => {
@@ -550,9 +617,143 @@ export class HudModel implements HudCommandSink {
     // 7. Target monster plaque
     this.syncHoveredMonsterTarget()
 
+    // 8. NPC menu / store / stash panels and S2C 0x2A replies.
+    this.syncNpcInteraction(hud)
+
     hud.syncPublishedState()
   }
 
+  private syncNpcInteraction(hud: HudManager): void {
+    const npc = this.world.npcInteraction
+    const prev = this.prevNpc
+    this.prevNpc = npc
+    const wp = hud.worldPanels
+
+    // a. NpcInit noted without a window: open the NPC menu for service NPCs (npc-table descriptors).
+    if (npc.npcId !== null && npc.window === 'none' && npc.npcId !== prev.npcId) {
+      const desc = this.npcDescriptor(npc.npcId)
+      if (desc) wp.openNpcMenu(desc, 400, 220, npc.npcId)
+    }
+    if (npc.npcId === null && wp.npcMenu && wp.npcMenu.npcId !== null) wp.npcMenu = null
+
+    // b. Trade / gamble window: store items come from 0x9C AddToShop (`containers.shop`).
+    if (npc.window !== 'none' && npc.npcId !== null) {
+      const npcId = npc.npcId
+      const desc = this.npcDescriptor(npcId)
+      if (!desc) throw new Error(`HudModel: store opened for NPC #${npcId} without a service descriptor`)
+      const ctx = this.priceContext(npcId)
+      const price = this.requireVendorPrice()
+      const gamble = npc.window === 'gamble'
+      const items = [...this.world.containers.shop.values()].map((item) => ({
+        storePage: item.storePage,
+        placement: {
+          item: { ...itemDataToUiInventoryItem(item), buyCost: price(item, gamble ? 2 : 0, ctx) },
+          col: item.gridX,
+          row: item.gridY,
+        },
+      }))
+      wp.setVendorShop({ npcId, descriptor: desc, mode: npc.window, items })
+      const canRepair = desc.canRepair && !gamble
+      wp.vendorRepairAllCost = canRepair ? this.requireVendorRepairAll()(ctx) : null
+      this.decoratePlayerItemPrices(hud, price, ctx, canRepair)
+      if (prev.window !== npc.window || prev.npcId !== npcId) hud.showVendorPanel()
+    } else if (prev.window !== 'none') {
+      wp.clearVendorShop()
+      hud.hideLeftPanelFromWorld('vendor')
+    }
+
+    // c. Stash: opened by S2C 0x77 action 0x10, closed when 0x4F 0x12 is sent.
+    if (npc.stashOpen && !prev.stashOpen) hud.showStashPanel()
+    else if (!npc.stashOpen && prev.stashOpen) hud.hideLeftPanelFromWorld('stash')
+
+    // d. S2C 0x2A NPCTransaction: react once per reply.
+    const txn = this.world.lastNpcTransaction
+    if (txn && txn.seq !== this.handledNpcTransactionSeq) {
+      this.handledNpcTransactionSeq = txn.seq
+      const msgKey = npcTransactionMessageKey(txn.result)
+      if (msgKey !== null) {
+        const text = requireTbl(msgKey, hud.lang)
+        this.lastNpcTransactionMessage = { tblKey: msgKey, text }
+        wp.showVendorStatus(text, 'white')
+      } else if (txn.result === 1) {
+        this.requirePlayUiSound()(NPC_SELL_SOUND_ID)
+      }
+    }
+  }
+
+  /** Sell value (and repair cost at smiths) on the player's bag and equipped items while a store is open. */
+  private decoratePlayerItemPrices(hud: HudManager, price: VendorPriceFn, ctx: VendorPriceContext, canRepair: boolean): void {
+    const decorate = (ui: UiInventoryItem, raw: ItemData): UiInventoryItem => ({
+      ...ui,
+      sellCost: price(raw, 1, ctx),
+      ...(canRepair && raw.maxDurability !== undefined && raw.maxDurability > 0 ? { repairCost: price(raw, 3, ctx) } : {}),
+    })
+    hud.inventory.gridItems = hud.inventory.gridItems.map((pl) => {
+      const raw = this.world.containers.inventory.get(Number(pl.item.id))
+      if (!raw) throw new Error(`HudModel: inventory item ${pl.item.id} missing from ClientWorld`)
+      return { ...pl, item: decorate(pl.item, raw) }
+    })
+    for (const raw of this.world.containers.equipment.values()) {
+      const slot = BODY_LOC_TO_EQUIP_SLOT[raw.bodyLoc || raw.equippedSlot]
+      const ui = slot ? hud.inventory.equipped[slot] : undefined
+      if (slot && ui) hud.inventory.equipped[slot] = decorate(ui, raw)
+    }
+  }
+
+  private npcDescriptor(npcId: number): TownNpcServiceDescriptor | undefined {
+    return getTownNpcDescriptorByHcIdx(this.npcClassOf(npcId))
+  }
+
+  /** MonStats hcIdx of NPC unit `npcId`; throws when the unit is not in the world. */
+  private npcClassOf(npcId: number): number {
+    const unit = this.world.getUnit('monster', npcId)
+    if (!unit) throw new Error(`HudModel: NPC unit #${npcId} is not in the world`)
+    return unit.classId
+  }
+
+  private priceContext(npcId: number): VendorPriceContext {
+    return { world: this.world, npcClass: this.npcClassOf(npcId) }
+  }
+
+  private requireVendorPrice(): VendorPriceFn {
+    if (!this.priceProvider) throw new Error('HudModel: no vendorPrice provider (HudModelOptions.vendorPrice)')
+    return this.priceProvider
+  }
+
+  private requireVendorRepairAll(): VendorRepairAllFn {
+    if (!this.repairAllProvider) throw new Error('HudModel: no vendorRepairAll provider (HudModelOptions.vendorRepairAll)')
+    return this.repairAllProvider
+  }
+
+  private requirePlayUiSound(): (soundId: number) => void {
+    if (!this.uiSound) throw new Error('HudModel: no playUiSound sink (HudModelOptions.playUiSound)')
+    return this.uiSound
+  }
+
+  /** The open store (`npcInteraction.window` trade / gamble); throws when none is open. */
+  private requireOpenStore(action: string): { npcId: number; gamble: boolean; ctx: VendorPriceContext } {
+    const npc = this.world.npcInteraction
+    if (npc.npcId === null || npc.window === 'none') throw new Error(`HudModel.${action}: no store window is open`)
+    return { npcId: npc.npcId, gamble: npc.window === 'gamble', ctx: this.priceContext(npc.npcId) }
+  }
+
+  /** `true` when `action` ran less than 2000 ms ago (the click is dropped, like D2Client). */
+  private isThrottled(action: string): boolean {
+    const t = this.now()
+    const last = this.lastNpcActionAt.get(action)
+    if (last !== undefined && t - last < NPC_TRADE_THROTTLE_MS) return true
+    this.lastNpcActionAt.set(action, t)
+    return false
+  }
+
+  /** Player item by id from the bag, the paperdoll or the cursor. */
+  private requirePlayerItem(itemId: number, action: string): ItemData {
+    const c = this.world.containers
+    const item = c.inventory.get(itemId) ?? c.equipment.get(itemId) ?? (c.cursor?.id === itemId ? c.cursor : undefined)
+    if (!item) throw new Error(`HudModel.${action}: item #${itemId} is not carried by the player`)
+    return item
+  }
+
   /**
    * Update the hovered/targeted monster unit ID and refresh `hudManager.targetMonster`.
    */
@@ -737,28 +938,35 @@ export class HudModel implements HudCommandSink {
    * Trigger Horadric Cube transmute (`0x4F ClickButton` `buttonId = 0x18`).
    */
   transmuteCube(): void {
-    this.emitCommand({ type: 'ClickButton', buttonId: 0x18 })
+    this.emitCommand({ type: 'ClickButton', buttonId: ClickButtonId.Transmute, amount: 0 })
   }
 
   /**
    * Buy an item from an active NPC vendor (`0x32 NpcBuy`).
    */
-  buyFromNpc(npcId: number, itemId: number, tab = 0, cost = 0): void {
+  buyFromNpc(p: { npcId: number; itemId: number; itemMode: number; gamble: boolean; shiftFill: boolean; cost: number }): void {
-    this.emitCommand({ type: 'NpcBuy', npcId, itemId, tab, cost })
+    this.emitCommand({ type: 'NpcBuy', ...p })
   }
 
   /**
    * Sell an item to an active NPC vendor (`0x33 NpcSell`).
    */
-  sellToNpc(npcId: number, itemId: number, tab = 0, cost = 0): void {
+  sellToNpc(p: { npcId: number; itemId: number; itemMode: number; cost: number }): void {
-    this.emitCommand({ type: 'NpcSell', npcId, itemId, tab, cost })
+    this.emitCommand({ type: 'NpcSell', ...p })
   }
 
   /**
-   * Repair all or a single item at an NPC smith (`0x35 NpcRepair`).
+   * Repair one item at an NPC smith (`0x35` with itemMode / current durability).
    */
-  repairAtNpc(npcId: number, itemId?: number): void {
+  repairItemAtNpc(p: { npcId: number; itemId: number; itemMode: number; durability: number }): void {
-    this.emitCommand({ type: 'NpcRepair', npcId, itemId })
+    this.emitCommand({ type: 'NpcRepairItem', ...p })
+  }
+
+  /**
+   * Repair all items at an NPC smith (`0x35` field4 = 0x80000000).
+   */
+  repairAllAtNpc(npcId: number): void {
+    this.emitCommand({ type: 'NpcRepairAll', npcId })
   }
 
   /**
@@ -767,6 +975,95 @@ export class HudModel implements HudCommandSink {
   identifyAllAtNpc(npcId: number): void {
     this.emitCommand({ type: 'NpcIdentifyAll', npcId })
   }
+
+  /** NPC menu "trade" / "trade/repair" (`0x38` action 1). Throws when no price provider is configured. */
+  openNpcTrade(npcId: number): void {
+    this.requireVendorPrice()
+    this.requireVendorRepairAll()
+    this.requirePlayUiSound()
+    this.emitCommand({ type: 'NpcOpenTrade', npcId })
+    this.syncFromWorld()
+  }
+
+  /** NPC menu "gamble" (`0x38` action 2); only the six 1.13c gamble NPC classes. */
+  openNpcGamble(npcId: number): void {
+    const npcClass = this.npcClassOf(npcId)
+    if (!GAMBLE_NPC_CLASS_IDS.has(npcClass)) throw new Error(`HudModel.openNpcGamble: NPC class ${npcClass} does not gamble`)
+    this.requireVendorPrice()
+    this.requireVendorRepairAll()
+    this.requirePlayUiSound()
+    this.emitCommand({ type: 'NpcOpenGamble', npcId })
+    this.syncFromWorld()
+  }
+
+  /** Close the NPC menu / store (`0x30 NpcCancel`); the server sends nothing back. */
+  closeNpc(npcId: number): void {
+    this.emitCommand({ type: 'NpcCancel', target: { unitType: UNIT_TYPE_MONSTER, id: npcId } })
+    this.syncFromWorld()
+  }
+
+  /** Store grid click on shop item `itemId`: `0x32 NpcBuy` with the #10107 buy / gamble price. */
+  vendorBuy(itemId: number, shiftFill: boolean): boolean {
+    const store = this.requireOpenStore('vendorBuy')
+    const item = this.world.containers.shop.get(itemId)
+    if (!item) throw new Error(`HudModel.vendorBuy: shop item #${itemId} not in the store`)
+    const cost = this.requireVendorPrice()(item, store.gamble ? 2 : 0, store.ctx)
+    if (this.isThrottled('buy')) return false
+    this.buyFromNpc({
+      npcId: store.npcId,
+      itemId,
+      itemMode: 0,
+      gamble: store.gamble,
+      shiftFill: store.gamble ? false : shiftFill,
+      cost,
+    })
+    return true
+  }
+
+  /** Sell player item `itemId`: `0x33 NpcSell` with the #10107 sell price. */
+  vendorSell(itemId: number): boolean {
+    const store = this.requireOpenStore('vendorSell')
+    const item = this.requirePlayerItem(itemId, 'vendorSell')
+    const cost = this.requireVendorPrice()(item, 1, store.ctx)
+    if (this.isThrottled('sell')) return false
+    this.sellToNpc({ npcId: store.npcId, itemId, itemMode: 0, cost })
+    return true
+  }
+
+  /** Repair player item `itemId` (`0x35`); durability is the item's current value (absent stat = 0). */
+  vendorRepairItem(itemId: number): boolean {
+    const store = this.requireOpenStore('vendorRepairItem')
+    const item = this.requirePlayerItem(itemId, 'vendorRepairItem')
+    if (this.isThrottled('repair')) return false
+    this.repairItemAtNpc({ npcId: store.npcId, itemId, itemMode: 0, durability: item.curDurability ?? 0 })
+    return true
+  }
+
+  /** Repair All button (`0x35` field4 = 0x80000000). */
+  vendorRepairAll(): boolean {
+    const store = this.requireOpenStore('vendorRepairAll')
+    if (this.isThrottled('repair')) return false
+    this.repairAllAtNpc(store.npcId)
+    return true
+  }
+
+  /** Gold dialog mode 3: `0x4F ClickButton` 0x14 DepositGold. Non-positive amounts send nothing. */
+  depositGold(amount: number): void {
+    if (!Number.isInteger(amount) || amount <= 0) return
+    this.emitCommand({ type: 'ClickButton', buttonId: ClickButtonId.DepositGold, amount })
+  }
+
+  /** Gold dialog mode 4: `0x4F ClickButton` 0x13 WithdrawGold. Non-positive amounts send nothing. */
+  withdrawGold(amount: number): void {
+    if (!Number.isInteger(amount) || amount <= 0) return
+    this.emitCommand({ type: 'ClickButton', buttonId: ClickButtonId.WithdrawGold, amount })
+  }
+
+  /** Stash panel closed: `0x4F ClickButton` 0x12 CloseStash (no reply). */
+  closeStash(): void {
+    this.emitCommand({ type: 'ClickButton', buttonId: ClickButtonId.CloseStash, amount: 0 })
+    this.syncFromWorld()
+  }
 }
 
 export function clientUnitToMonsterTargetInfo(unit: ClientUnit): MonsterTargetHudInfo {

src/client/ui-model/transaction-cost-input.ts

@@ -0,0 +1,136 @@
+/**
+ * Builds D2Common 1.13c #10107 / #10071 pricing inputs from server item packets
+ * (`src/client/ui-model/transaction-cost-input.ts`). Prices are display-only:
+ * D2Game ignores the client cost field (buy 0x6fcdf200, sell 0x6fcef570).
+ */
+
+import {
+  computeRepairAllCost113c,
+  computeTransactionCost113c,
+  getCanonicalTransactionCostTables,
+  type ItemQuality113c,
+  type TransactionCostContext,
+  type TransactionCostInput,
+  type TransactionCostStat,
+} from '../../common/items/transaction-cost.ts'
+import type { ItemData } from '../../netproto/index.ts'
+import type { ClientWorld } from '../world/client-world.ts'
+
+/** ItemStatCost ids the item packet carries outside the property list. */
+const STAT_ARMORCLASS = 31
+const STAT_QUANTITY = 70
+const STAT_DURABILITY = 72
+const STAT_MAXDURABILITY = 73
+/** `STAT_ITEM_REDUCEDPRICES`; read as a full (player + equipped items) stat by #10107. */
+const STAT_ITEM_REDUCEDPRICES = 87
+/** Body locations 1..12 used by the repair-all loop (0x6fd7a210 walks 13 slots, slot 0 unused). */
+const REPAIR_ALL_SLOTS = 13
+
+/**
+ * Compact ("simple") item packets carry no quality field; the engine creates them
+ * as `ITEMQUAL_NORMAL` (2) — potions, scrolls, keys, gems, gamble previews.
+ */
+const QUALITY_NORMAL: ItemQuality113c = 2
+/** Item flag 0x02000000: packet stops after the item code (D2Common 0x6fd7a746). */
+const ITEM_FLAG_CODE_ONLY = 0x02000000
+
+export function itemToTransactionCostInput(
+  item: ItemData,
+  socketed: readonly ItemData[],
+  type: 0 | 1 | 2 | 3,
+): TransactionCostInput {
+  let quality: ItemQuality113c
+  if (item.quality !== undefined) quality = item.quality
+  else if (item.simple) quality = QUALITY_NORMAL
+  else if (type === 2 && (item.rawFlags & ITEM_FLAG_CODE_ONLY) !== 0) {
+    // Gamble previews are sent code-only (flag 0x02000000, capture 09); the gamble branch
+    // (0x6fd78f38 -> 0x6fd74840) prices from code, clvl and item format and never reads quality.
+    quality = QUALITY_NORMAL
+  } else throw new Error(`item #${item.id} (${item.code}) has no quality in its packet`)
+
+  // Base list = fields the packet sends outside the property list; full = base + properties.
+  const acc = new Map<string, { statId: number; param: number; value: number; base: number }>()
+  const add = (statId: number, param: number, value: number, isBase: boolean): void => {
+    const k = `${statId}:${param}`
+    const cur = acc.get(k) ?? { statId, param, value: 0, base: 0 }
+    cur.value += value
+    if (isBase) cur.base += value
+    acc.set(k, cur)
+  }
+  if (item.defense !== undefined) add(STAT_ARMORCLASS, 0, item.defense, true)
+  if (item.maxDurability !== undefined) add(STAT_MAXDURABILITY, 0, item.maxDurability, true)
+  if (item.curDurability !== undefined) add(STAT_DURABILITY, 0, item.curDurability, true)
+  if (item.quantity !== undefined) add(STAT_QUANTITY, 0, item.quantity, true)
+  for (const s of item.stats) add(s.statId, s.param, s.value, false)
+  for (const s of item.runewordStats) add(s.statId, s.param, s.value, false)
+  const stats: TransactionCostStat[] = [...acc.values()]
+
+  // Rare/crafted affixes are sent as 3 (prefix, suffix) pairs (item-bitstream.ts).
+  const ra = item.rareAffixes
+  const rare =
+    ra !== undefined && ra.length === 6
+      ? {
+          rarePrefixIds: [ra[0]!, ra[2]!, ra[4]!] as const,
+          rareSuffixIds: [ra[1]!, ra[3]!, ra[5]!] as const,
+        }
+      : {}
+
+  return {
+    code: item.code,
+    itemFormat: item.version,
+    quality,
+    identified: item.identified,
+    ethereal: item.ethereal,
+    starterItem: item.starterItem,
+    isEar: item.isEar,
+    ...(item.earLevel !== undefined ? { earLevel: item.earLevel } : {}),
+    ...(item.tomeData !== undefined ? { bookId: item.tomeData } : {}),
+    ...(item.magicPrefixId !== undefined ? { magicPrefixId: item.magicPrefixId } : {}),
+    ...(item.magicSuffixId !== undefined ? { magicSuffixId: item.magicSuffixId } : {}),
+    ...(item.autoAffixId !== undefined ? { autoAffixId: item.autoAffixId } : {}),
+    ...(item.uniqueItemId !== undefined ? { uniqueItemId: item.uniqueItemId } : {}),
+    ...(item.setItemId !== undefined ? { setItemId: item.setItemId } : {}),
+    ...rare,
+    stats,
+    socketedChildCodes: socketed.map(s => s.code),
+  }
+}
+
+/** Pricing context for `npcClass` (MonStats hcIdx) from the server-mirrored world. */
+export function transactionCostContextFromWorld(world: ClientWorld, npcClass: number): TransactionCostContext {
+  let reduced = world.self.stats.get(STAT_ITEM_REDUCEDPRICES)
+  for (const it of world.containers.equipment.values()) {
+    for (const s of it.stats) if (s.statId === STAT_ITEM_REDUCEDPRICES) reduced += s.value
+  }
+  const quests = world.quests
+  return {
+    playerLevel: world.self.level,
+    playerReducedPricesPct: reduced,
+    difficulty: world.difficulty,
+    npcClass,
+    // 0x6fd7d0f0 tests bit `quest * 16 + state` of the quest record; S2C quest state mirrors it as 16-bit words.
+    isQuestFlagSet: (questId, state) => {
+      const word = quests[questId]
+      if (word === undefined) throw new Error(`quest ${questId} outside the mirrored quest record`)
+      return ((word >> state) & 1) === 1
+    },
+    tables: getCanonicalTransactionCostTables(),
+  }
+}
+
+/** #10107 price of a server item for `type` 0 buy / 1 sell / 2 gamble / 3 repair. */
+export function priceItem113c(world: ClientWorld, item: ItemData, type: 0 | 1 | 2 | 3, npcClass: number): number {
+  const socketed = world.containers.sockets.get(item.id) ?? []
+  return computeTransactionCost113c(itemToTransactionCostInput(item, socketed, type), transactionCostContextFromWorld(world, npcClass), type)
+}
+
+/** #10071 repair-all cost over the player's equipped items (slots by body location). */
+export function repairAllCost113c(world: ClientWorld, npcClass: number): number {
+  const slots: (TransactionCostInput | null)[] = new Array(REPAIR_ALL_SLOTS).fill(null)
+  for (const it of world.containers.equipment.values()) {
+    const loc = it.bodyLoc
+    if (!(loc > 0 && loc < REPAIR_ALL_SLOTS)) throw new Error(`equipped item #${it.id} has body location ${loc}`)
+    slots[loc] = itemToTransactionCostInput(it, world.containers.sockets.get(it.id) ?? [], 3)
+  }
+  return computeRepairAllCost113c(slots, transactionCostContextFromWorld(world, npcClass))
+}

src/client/ui-model/vendor-price.ts

@@ -0,0 +1,32 @@
+/**
+ * Vendor price provider contract (`src/client/ui-model/vendor-price.ts`).
+ *
+ * D2Client prices store items locally with D2Common #10107 (repair-all: #10071) for the tooltip and the
+ * `0x32 NpcBuy` / `0x33 NpcSell` cost field; D2Game ignores that field and prices server-side. The HUD never
+ * derives a price itself: `HudModel` receives these functions through its options, and opening a store
+ * without them throws (no fallback price). Production wiring injects {@link vendorPrice113c} /
+ * {@link vendorRepairAll113c}; tests inject stubs.
+ */
+
+import type { ItemData } from '../../netproto/index.ts'
+import type { ClientWorld } from '../world/client-world.ts'
+import { priceItem113c, repairAllCost113c } from './transaction-cost-input.ts'
+
+/** Pricing inputs: the server-mirrored world (clvl, difficulty, quests, reduced-price stats) and the NPC class. */
+export interface VendorPriceContext {
+  readonly world: ClientWorld
+  /** MonStats hcIdx of the store NPC (e.g. 147 = Gheed). */
+  readonly npcClass: number
+}
+
+/** Transaction type `0` buy, `1` sell, `2` gamble, `3` repair; returns the displayed / sent gold amount. */
+export type VendorPriceFn = (item: ItemData, type: 0 | 1 | 2 | 3, ctx: VendorPriceContext) => number
+
+/** "Repair all equipment: %d" total (patchstring 10095) for the player's equipped items. */
+export type VendorRepairAllFn = (ctx: VendorPriceContext) => number
+
+/** D2Common 1.13c #10107 port. */
+export const vendorPrice113c: VendorPriceFn = (item, type, ctx) => priceItem113c(ctx.world, item, type, ctx.npcClass)
+
+/** D2Common 1.13c #10071 port. */
+export const vendorRepairAll113c: VendorRepairAllFn = (ctx) => repairAllCost113c(ctx.world, ctx.npcClass)

src/client/ui/hud-manager.ts

@@ -45,7 +45,6 @@ import {
   type CursorState,
 } from './cursor.ts'
 import type { CharacterClassCode } from '../../common/units/classes.ts'
-import type { TownNpcServiceDescriptor, VendorNpcId } from '../../common/units/npc-table.ts'
 import {
   detectInitialLang,
   setCurrentLang,
@@ -54,6 +53,7 @@ import {
   type TblLang,
 } from '../i18n/lang.ts'
 import { setTooltipLocale } from '../../common/items/item-tooltip.ts'
+import { requireTbl } from '../i18n/lang.ts'
 import {
   computeViewportAnchors,
   getViewportProfile,
@@ -283,6 +283,15 @@ export function logicalToClient(
  * Server-authoritative HUD command sink (online mode: `HudModel`). Every method only emits a `ClientCommand`;
  * the HUD never mutates gameplay state locally while a sink is attached.
  */
+export type GoldDialogMode = 0 | 3 | 4
+
+export interface GoldDialogRect {
+  readonly x: number
+  readonly y: number
+  readonly w: number
+  readonly h: number
+}
+
 export interface HudCommandSink {
   allocateStat(key: BaseStatKey): boolean
   allocateSkill(skillId: number): boolean
@@ -299,6 +308,28 @@ export interface HudCommandSink {
   useItem(itemId: number): void
   transmuteCube(): void
   teleportToLevel(destAreaId: number): void
+  /** NPC menu "trade" / "trade/repair": `0x38` action 1. */
+  openNpcTrade(npcId: number): void
+  /** NPC menu "gamble": `0x38` action 2 (Gheed, Elzix, Alkor, Jamella, Anya, Nihlathak). */
+  openNpcGamble(npcId: number): void
+  /** NPC menu "Identify Items" (Deckard Cain): `0x34`. */
+  identifyAllAtNpc(npcId: number): void
+  /** Close the NPC menu / store: `0x30 NpcCancel`. The server sends nothing back. */
+  closeNpc(npcId: number): void
+  /** Store grid click on a shop item: `0x32 NpcBuy` (gamble flag from the open window). */
+  vendorBuy(itemId: number, shiftFill: boolean): void
+  /** Sell a player item: `0x33 NpcSell`. */
+  vendorSell(itemId: number): void
+  /** Repair one item: `0x35 NpcRepair`. */
+  vendorRepairItem(itemId: number): void
+  /** Repair all equipped items: `0x35` with field4 = 0x80000000. */
+  vendorRepairAll(): void
+  /** Gold dialog mode 3: `0x4F` button 0x14. */
+  depositGold(amount: number): void
+  /** Gold dialog mode 4: `0x4F` button 0x13. */
+  withdrawGold(amount: number): void
+  /** Stash panel closed: `0x4F` button 0x12 (no reply). */
+  closeStash(): void
 }
 
 /** Parse the numeric server item id carried by a `UiInventoryItem` synced from `ClientWorld`; throws otherwise. */
@@ -392,6 +423,13 @@ export class HudManager {
   currentClass: CharacterClassCode | null = null
   private _commandSink: HudCommandSink | null = null
 
+  /**
+   * D2Client gold dialog: mode `0` drop (string 4033), `3` deposit (4049), `4` withdraw (4050).
+   * The amount is clamped only to the source balance (inventory gold for 0/3, stash gold for 4);
+   * the server applies the inventory (clvl * 10,000) and stash (2,500,000) caps.
+   */
+  goldDialog: { mode: GoldDialogMode; amount: number; fresh: boolean } | null = null
+
   /**
    * Server-authoritative command sink (online: `HudModel`). When attached, HUD interactions only emit
    * `ClientCommand`s; all displayed state changes arrive back from the server through `HudModel.syncFromWorld()`.
@@ -693,41 +731,164 @@ export class HudManager {
     return ok
   }
 
-  /**
+  private requireSink(action: string): HudCommandSink {
-   * Opens a Town NPC Vendor or Gamble session on the Left Dock and ensures Player Inventory is open on the Right Dock.
+    if (!this._commandSink) throw new Error(`HudManager.${action}: no server command sink attached`)
-   */
+    return this._commandSink
-  openVendorSession(
-    descriptorOrName: TownNpcServiceDescriptor | VendorNpcId | string,
-    mode: 'trade' | 'gamble' = 'trade',
-    difficulty: 0 | 1 | 2 = 0,
-  ): boolean {
-    if (this.currentClass === null) {
-      throw new Error('HudManager.openVendorSession: character class not assigned by the server yet')
   }
-    const playerCtx = {
+
-      level: this.charSheet.attrs.level,
+  /** Server opened a store (`ClientWorld.npcInteraction.window`): show the vendor panel with the inventory. */
-      str: this.charSheet.attrs.str,
+  showVendorPanel(): void {
-      dex: this.charSheet.attrs.dex,
+    if (!this.worldPanels.activeVendorDescriptor) {
-      classCode: this.currentClass,
+      throw new Error('HudManager.showVendorPanel: no store set (WorldPanelsHud.setVendorShop)')
     }
-    this.worldPanels.activePlayerInventory = this.inventory
-    this.inventory.setPlayerContext(playerCtx)
-    this.worldPanels.setPlayerContext(playerCtx)
-    const ok = this.worldPanels.openVendorForNpc(
-      descriptorOrName,
-      mode,
-      this.charSheet.attrs.level,
-      difficulty,
-    )
-    if (!ok) return false
     this.worldPanels.npcMenu = null
     this.leftPanel = 'vendor'
     this.charSheet.visible = false
-    if (this.rightPanel !== 'inv') {
+    if (this.rightPanel !== 'inv') this.toggleRightPanel('inv')
-      this.toggleRightPanel('inv')
+    this.syncPublishedState()
+  }
+
+  /** Server opened the stash (S2C 0x77 action 0x10): show the stash panel with the inventory. */
+  showStashPanel(): void {
+    this.leftPanel = 'stash'
+    this.charSheet.visible = false
+    if (this.rightPanel !== 'inv') this.toggleRightPanel('inv')
+    this.syncPublishedState()
+  }
+
+  /** World state closed `kind` (already noted by `ClientWorld`): hide it without sending anything. */
+  hideLeftPanelFromWorld(kind: 'vendor' | 'stash'): void {
+    if (this.leftPanel !== kind) return
+    this.leftPanel = 'none'
+    if (kind === 'vendor') this.worldPanels.releaseMomentaryVendorButton()
+    if (this.goldDialog?.mode === 4 && kind === 'stash') this.goldDialog = null
+    this.syncPublishedState()
+  }
+
+  /** Dismiss the NPC menu and end the interaction (`0x30 NpcCancel`). */
+  dismissNpcMenu(): void {
+    const menu = this.worldPanels.npcMenu
+    if (!menu) return
+    this.worldPanels.npcMenu = null
+    if (menu.npcId !== null) this.requireSink('dismissNpcMenu').closeNpc(menu.npcId)
+    this.syncPublishedState()
+  }
+
+  /** Leaving the vendor / stash panel tells the server (`0x30` / `0x4F 0x12`); other panels are local. */
+  private leaveLeftPanel(prev: LeftDockPanelKind): void {
+    if (prev === 'vendor') {
+      const npcId = this.worldPanels.vendorNpcId
+      this.worldPanels.clearVendorShop()
+      if (npcId !== null) this.requireSink('closeVendor').closeNpc(npcId)
+    } else if (prev === 'stash') {
+      if (this.goldDialog && this.goldDialog.mode !== 0) this.goldDialog = null
+      this._commandSink?.closeStash()
+    }
+  }
+
+  /** Source balance the gold dialog clamps to: stash gold for withdraw, inventory gold otherwise. */
+  goldDialogBalance(mode: GoldDialogMode): number {
+    return mode === 4 ? this.worldPanels.stashGold : this.inventory.gold
+  }
+
+  /** Open the gold dialog pre-filled with the whole source balance. */
+  openGoldDialog(mode: GoldDialogMode): void {
+    if (mode === 3 && this.leftPanel !== 'stash') throw new Error('HudManager.openGoldDialog: deposit needs the stash open')
+    if (mode === 4 && this.leftPanel !== 'stash') throw new Error('HudManager.openGoldDialog: withdraw needs the stash open')
+    this.goldDialog = { mode, amount: this.goldDialogBalance(mode), fresh: true }
+    this.syncPublishedState()
+  }
+
+  /** Set the typed amount, clamped to `0 .. source balance`. */
+  setGoldDialogAmount(amount: number): void {
+    const dlg = this.goldDialog
+    if (!dlg) throw new Error('HudManager.setGoldDialogAmount: gold dialog is not open')
+    if (!Number.isFinite(amount)) throw new Error(`HudManager.setGoldDialogAmount: invalid amount ${amount}`)
+    dlg.amount = Math.max(0, Math.min(this.goldDialogBalance(dlg.mode), Math.floor(amount)))
+    dlg.fresh = false
+  }
+
+  /** Digit / Backspace editing; the first digit after opening replaces the pre-filled amount. */
+  typeGoldDialogKey(key: string): void {
+    const dlg = this.goldDialog
+    if (!dlg) throw new Error('HudManager.typeGoldDialogKey: gold dialog is not open')
+    if (key === 'Backspace') {
+      this.setGoldDialogAmount(dlg.fresh ? 0 : Math.floor(dlg.amount / 10))
+    } else if (/^[0-9]$/.test(key)) {
+      this.setGoldDialogAmount((dlg.fresh ? 0 : dlg.amount) * 10 + Number(key))
+    }
+  }
+
+  /** "ok": send the request for the clamped amount (nothing for 0) and close the dialog. */
+  confirmGoldDialog(): void {
+    const dlg = this.goldDialog
+    if (!dlg) throw new Error('HudManager.confirmGoldDialog: gold dialog is not open')
+    const amount = Math.max(0, Math.min(this.goldDialogBalance(dlg.mode), dlg.amount))
+    this.goldDialog = null
+    if (amount > 0) {
+      const sink = this.requireSink('confirmGoldDialog')
+      if (dlg.mode === 0) sink.dropGold(amount)
+      else if (dlg.mode === 3) sink.depositGold(amount)
+      else sink.withdrawGold(amount)
     }
     this.syncPublishedState()
-    return true
+  }
+
+  cancelGoldDialog(): void {
+    this.goldDialog = null
+    this.syncPublishedState()
+  }
+
+  /** Gold dialog box (centered stone box: title, amount, ok / cancel). */
+  getGoldDialogLayout(): { x: number; y: number; w: number; h: number; ok: GoldDialogRect; cancel: GoldDialogRect } {
+    const w = 260
+    const h = 110
+    const x = Math.round(this.screenWidth / 2 - w / 2)
+    const y = Math.round((this.screenHeight - 47) / 2 - h / 2)
+    return {
+      x,
+      y,
+      w,
+      h,
+      ok: { x: x + 30, y: y + h - 34, w: 80, h: 22 },
+      cancel: { x: x + w - 110, y: y + h - 34, w: 80, h: 22 },
+    }
+  }
+
+  private handleGoldDialogClick(x: number, y: number): void {
+    const l = this.getGoldDialogLayout()
+    const inRect = (r: GoldDialogRect) => x >= r.x && x <= r.x + r.w && y >= r.y && y <= r.y + r.h
+    if (inRect(l.ok)) this.confirmGoldDialog()
+    else if (inRect(l.cancel)) this.cancelGoldDialog()
+  }
+
+  private drawGoldDialog(ctx: CanvasRenderingContext2D): void {
+    const dlg = this.goldDialog
+    if (!dlg) return
+    const l = this.getGoldDialogLayout()
+    const titleKey = dlg.mode === 0 ? 'strDropGoldHowMuch' : dlg.mode === 3 ? 'strBankGoldDeposit' : 'strBankGoldWithdraw'
+    ctx.fillStyle = 'rgba(0, 0, 0, 0.9)'
+    ctx.fillRect(l.x, l.y, l.w, l.h)
+    ctx.strokeStyle = '#6c5c40'
+    ctx.strokeRect(l.x + 0.5, l.y + 0.5, l.w - 1, l.h - 1)
+    this.font.drawText(ctx, requireTbl(titleKey, this.lang), l.x + l.w / 2, l.y + 22, {
+      font: 'font8',
+      color: 'white',
+      align: 'center',
+    })
+    this.font.drawText(ctx, String(dlg.amount), l.x + l.w / 2, l.y + 50, {
+      font: 'font16',
+      color: 'gold',
+      align: 'center',
+    })
+    for (const [rect, key] of [[l.ok, 'ok'], [l.cancel, 'Back']] as const) {
+      ctx.strokeRect(rect.x + 0.5, rect.y + 0.5, rect.w - 1, rect.h - 1)
+      this.font.drawText(ctx, requireTbl(key, this.lang), rect.x + rect.w / 2, rect.y + 16, {
+        font: 'font16',
+        color: 'white',
+        align: 'center',
+      })
+    }
   }
 
   /**
@@ -735,16 +896,19 @@ export class HudManager {
    * Strictly follows D2Client.dll mutual exclusion on the Left Dock (`0..400`).
    */
   toggleLeftPanel(kind: Exclude<LeftDockPanelKind, 'none'>): void {
-    if (this.leftPanel === kind) {
+    const prev = this.leftPanel
+    if (prev === kind) {
       this.leftPanel = 'none'
       this.charSheet.visible = false
       this.worldPanels.vendorTradeState = 'idle'
       this.worldPanels.releaseMomentaryVendorButton()
+      this.leaveLeftPanel(prev)
     } else {
       if (kind === 'vendor' && !this.worldPanels.activeVendorDescriptor) {
         throw new Error('Cannot open vendor panel without an active vendor session')
       }
       this.leftPanel = kind
+      if (prev !== 'none') this.leaveLeftPanel(prev)
       this.charSheet.visible = kind === 'char'
       if ((kind === 'stash' || kind === 'vendor') && this.rightPanel === 'none') {
         this.toggleRightPanel('inv')
@@ -777,8 +941,13 @@ export class HudManager {
       this.belt.lockedOpen ||
       this.hotkeys.openPopup !== null ||
       this.worldPanels.npcMenu !== null ||
+      this.goldDialog !== null ||
       this.inventory.isIdentifyMode()
+    const prevLeft = this.leftPanel
+    this.goldDialog = null
+    this.dismissNpcMenu()
     this.leftPanel = 'none'
+    if (prevLeft !== 'none') this.leaveLeftPanel(prevLeft)
     this.rightPanel = 'none'
     this.charSheet.visible = false
     this.inventory.visible = false
@@ -849,6 +1018,7 @@ export class HudManager {
    * Central vision corridor (e.g. `400 < logicalX < 624` in `1024x768`) remains open and returns false.
    */
   isPointInterceptedByHud(logicalX: number, logicalY: number): boolean {
+    if (this.goldDialog) return true
     const profile = this.viewportProfile
     const docking = this.getDockingLayout()
     const { marginW } = docking
@@ -898,6 +1068,14 @@ export class HudManager {
   private bindEvents(): void {
     window.addEventListener('keydown', (e) => {
       if (e.target instanceof HTMLInputElement || e.target instanceof HTMLSelectElement) return
+      if (this.goldDialog) {
+        e.preventDefault()
+        if (e.key === 'Enter') this.confirmGoldDialog()
+        else if (e.key === 'Escape') this.cancelGoldDialog()
+        else this.typeGoldDialogKey(e.key)
+        this.syncPublishedState()
+        return
+      }
       const key = e.key.toUpperCase()
 
       if (key === 'I' || key === 'B') {
@@ -1067,9 +1245,14 @@ export class HudManager {
   handleHudMouseDown(e: MouseEvent): void {
       if (e.button !== 0 && e.button !== 2) return
       const pt = this.clientToLogical(e.clientX, e.clientY)
+      if (this.goldDialog) {
+        e.preventDefault()
+        e.stopPropagation()
+        if (e.button === 0) this.handleGoldDialogClick(pt.x, pt.y)
+        return
+      }
       if (this.worldPanels.npcMenu && !this.worldPanels.isPointInNpcMenu(pt.x, pt.y, this.font)) {
-        this.worldPanels.npcMenu = null
+        this.dismissNpcMenu()
-        this.syncPublishedState()
       }
       if (!this.isPointInterceptedByHud(pt.x, pt.y)) {
         if (this.inventory.isIdentifyMode()) {
@@ -1107,19 +1290,25 @@ export class HudManager {
 
       // Town NPC Stone Menu click
       if (this.worldPanels.npcMenu) {
+        const npcId = this.worldPanels.npcMenu.npcId
         this.worldPanels.handleNpcMenuClick(
           pt.x,
           pt.y,
           {
-            onOpenVendor: (desc, mode) => {
+            onOpenVendor: (_desc, mode) => {
-              this.openVendorSession(desc, mode)
+              const sink = this.requireSink('npcMenu')
+              if (npcId === null) throw new Error('HudManager: NPC menu has no server NPC id')
+              if (mode === 'trade') sink.openNpcTrade(npcId)
+              else sink.openNpcGamble(npcId)
             },
             onIdentifyAll: (_desc) => {
-              const count = this.worldPanels.identifyAllUiItems(this.inventory)
+              const sink = this.requireSink('npcMenu')
-              this.worldPanels.showAreaBanner(
+              if (npcId === null) throw new Error('HudManager: NPC menu has no server NPC id')
-                count > 0 ? `已鉴定 ${count} 件物品` : '背包中没有未鉴定物品',
+              sink.identifyAllAtNpc(npcId)
-                count > 0 ? `Identified ${count} items` : 'No unidentified items in inventory',
+              sink.closeNpc(npcId)
-              )
+            },
+            onCancel: () => {
+              if (npcId !== null) this.requireSink('npcMenu').closeNpc(npcId)
             },
           },
           this.font,
@@ -1180,10 +1369,16 @@ export class HudManager {
           this.syncPublishedState()
           return
         } else if (this.leftPanel !== 'none') {
-          this.worldPanels.handleLeftDockClick(this.leftPanel, leftX, pt.y, {
+          const dockKind = this.leftPanel
+          this.worldPanels.handleLeftDockClick(dockKind, leftX, pt.y, {
             onClose: () => {
               this.leftPanel = 'none'
+              this.leaveLeftPanel(dockKind)
             },
+            onStashGoldButton: () => this.openGoldDialog(4),
+            onVendorBuy: (item, shiftFill) => this.requireSink('vendorBuy').vendorBuy(serverItemIdOf(item), shiftFill),
+            onVendorSell: (item) => this.requireSink('vendorSell').vendorSell(serverItemIdOf(item)),
+            onVendorRepairAll: () => this.requireSink('vendorRepairAll').vendorRepairAll(),
             onWaypointTeleport: (act, slug, levelId) => {
               if (this._commandSink) {
                 this._commandSink.teleportToLevel(levelId)
@@ -1260,52 +1455,12 @@ export class HudManager {
                 }
               }
             }
+          }
 
-            // Vendor Repair or Sell/Quick-Sell from Player Inventory
+          if (this.leftPanel === 'vendor' && !this.inventory.isIdentifyMode() && this.handleVendorInventoryClick(rightX, pt.y, e.button === 2)) {
-            if (this.leftPanel === 'vendor') {
-              // D2Client.dll 0x6fb472d0: Right-clicking while in Buy/Sell/Repair cursor mode cancels back to idle
-              if (e.button === 2 && this.worldPanels.vendorTradeState !== 'idle') {
-                this.worldPanels.vendorTradeState = 'idle'
             this.syncPublishedState()
             return
           }
-              if (
-                rightX >= INV_GRID_ORIGIN.x &&
-                rightX < INV_GRID_ORIGIN.x + INV_GRID_ORIGIN.cols * INV_GRID_ORIGIN.cellPx &&
-                pt.y >= INV_GRID_ORIGIN.y &&
-                pt.y < INV_GRID_ORIGIN.y + INV_GRID_ORIGIN.rows * INV_GRID_ORIGIN.cellPx
-              ) {
-                const col = Math.floor((rightX - INV_GRID_ORIGIN.x) / INV_GRID_ORIGIN.cellPx)
-                const row = Math.floor((pt.y - INV_GRID_ORIGIN.y) / INV_GRID_ORIGIN.cellPx)
-                const hitIdx = this.inventory.gridItems.findIndex(
-                  p => col >= p.col && col < p.col + p.item.invWidth && row >= p.row && row < p.row + p.item.invHeight,
-                )
-                if (hitIdx !== -1) {
-                  const hit = this.inventory.gridItems[hitIdx]!
-                  if (this.worldPanels.vendorTradeState === 'repair') {
-                    this.worldPanels.repairSingleUiItem(hit.item, this.inventory)
-                    this.syncPublishedState()
-                    return
-                  }
-                  if (this.worldPanels.vendorTradeState === 'sell' || e.shiftKey || e.button === 2) {
-                    const res = this.worldPanels.sellToActiveVendor(hit.item, this.inventory)
-                    if (res.ok) {
-                      if (this.inventory.gridItems[hitIdx] === hit) {
-                        this.inventory.gridItems.splice(hitIdx, 1)
-                      }
-                      this.inventory.hoveredItem = null
-                    }
-                    this.syncPublishedState()
-                    return
-                  }
-                }
-              } else if (this.worldPanels.vendorTradeState === 'repair' && this.inventory.hoveredItem) {
-                this.worldPanels.repairSingleUiItem(this.inventory.hoveredItem.item, this.inventory)
-                this.syncPublishedState()
-                return
-              }
-            }
-          }
 
           if (this._commandSink && this.forwardInventoryPanelClick(rightX, pt.y, e.button === 2)) {
             this.syncPublishedState()
@@ -1319,9 +1474,7 @@ export class HudManager {
             {
               onOpenCube: () => this.toggleLeftPanel('cube'),
               onCastTownPortal: (source, item) => this.callbacks.onCastTownPortal?.(source, item),
-              onDropGold: (amt) => {
+              onGoldButton: () => this.openGoldDialog(this.leftPanel === 'stash' ? 3 : 0),
-                this.dropInventoryGold(amt, pt)
-              },
             },
             e.button === 2 ? 2 : 0,
             {
@@ -1341,6 +1494,46 @@ export class HudManager {
       }
   }
 
+  /**
+   * Inventory click while a store is open and the sell / repair cursor is armed (D2Client 0x6fb472d0):
+   * right-click disarms; sell sends `0x33` for the bag item; repair sends `0x35` for the bag or equipped item.
+   * Returns `false` in the idle / buy state so the click picks up / places items as usual.
+   */
+  private handleVendorInventoryClick(x: number, y: number, isRightClick: boolean): boolean {
+    const state = this.worldPanels.vendorTradeState
+    if (state !== 'sell' && state !== 'repair') return false
+    if (isRightClick) {
+      this.worldPanels.vendorTradeState = 'idle'
+      return true
+    }
+    let target: UiInventoryItem | null = null
+    if (
+      x >= INV_GRID_ORIGIN.x &&
+      x < INV_GRID_ORIGIN.x + INV_GRID_ORIGIN.cols * INV_GRID_ORIGIN.cellPx &&
+      y >= INV_GRID_ORIGIN.y &&
+      y < INV_GRID_ORIGIN.y + INV_GRID_ORIGIN.rows * INV_GRID_ORIGIN.cellPx
+    ) {
+      const col = Math.floor((x - INV_GRID_ORIGIN.x) / INV_GRID_ORIGIN.cellPx)
+      const row = Math.floor((y - INV_GRID_ORIGIN.y) / INV_GRID_ORIGIN.cellPx)
+      target =
+        this.inventory.gridItems.find(
+          p => col >= p.col && col < p.col + p.item.invWidth && row >= p.row && row < p.row + p.item.invHeight,
+        )?.item ?? null
+    } else if (state === 'repair') {
+      for (const [slot, rect] of Object.entries(EQUIP_SLOTS_LAYOUT) as [EquipSlotId, (typeof EQUIP_SLOTS_LAYOUT)[EquipSlotId]][]) {
+        if (x >= rect.x && x <= rect.x + rect.w && y >= rect.y && y <= rect.y + rect.h) {
+          target = this.inventory.equipped[slot] ?? null
+          break
+        }
+      }
+    }
+    if (!target) return true
+    const sink = this.requireSink(state === 'sell' ? 'vendorSell' : 'vendorRepairItem')
+    if (state === 'sell') sink.vendorSell(serverItemIdOf(target))
+    else sink.vendorRepairItem(serverItemIdOf(target))
+    return true
+  }
+
   /**
    * Forward an inventory-panel click (grid / paperdoll) to the server sink. Returns `false` when the point is not
    * on an item area so the panel's own chrome (close / gold buttons / swap tabs) still handles it.
@@ -1745,6 +1938,9 @@ export class HudManager {
       this.worldPanels.drawItemTooltip(ctx, this.inventory.hoveredItem, this.font, this.leftPanel === 'vendor')
     }
 
+    // 10b. Gold dialog (drop / deposit / withdraw)
+    this.drawGoldDialog(ctx)
+
     // 11. Authentic Hand / Trade Cursor & Held Item at Hotspot
     this.renderCursor(ctx, nowMs)
 

src/client/ui/inventory.ts

@@ -64,7 +64,7 @@ export {
 import {
   INV_COLS,
   INV_ROWS,
-  PLAYER_GOLD_CAP,
+  STASH_GOLD_CAP,
   getInventoryGoldLimit,
   findFreeGridSlot,
   type EquipSlotId,
@@ -76,7 +76,7 @@ import {
 export {
   INV_COLS,
   INV_ROWS,
-  PLAYER_GOLD_CAP,
+  STASH_GOLD_CAP,
   getInventoryGoldLimit,
   findFreeGridSlot,
   type EquipSlotId,
@@ -127,6 +127,9 @@ export const INV_GOLD_BTN_BOUNDS = {
   h: 18,
 } as const
 
+/** Panel-relative click rect of the inventory gold coin button (inclusive bounds, D2Client inventory panel). */
+export const INV_GOLD_BTN_HIT = { relX0: 83, relX1: 103, relY0: 392, relY1: 410 } as const
+
 export const INV_GOLD_BOX_RECESS = {
   x: 400 + 107,
   y: 60 + 392,
@@ -1583,34 +1586,6 @@ export function drawItemSocketOverlay(
   }
 }
 
-declare global {
-  interface Boolean {
-    readonly cursorItem: UiInventoryItem | null
-    readonly action: 'equip' | 'unequip' | 'swap' | 'none'
-  }
-}
-
-let _lastInvClickCursorItem: UiInventoryItem | null = null
-let _lastInvClickAction: 'equip' | 'unequip' | 'swap' | 'none' = 'none'
-
-if (!Object.prototype.hasOwnProperty.call(Boolean.prototype, 'cursorItem')) {
-  Object.defineProperty(Boolean.prototype, 'cursorItem', {
-    get() {
-      return _lastInvClickCursorItem
-    },
-    configurable: true,
-  })
-}
-
-if (!Object.prototype.hasOwnProperty.call(Boolean.prototype, 'action')) {
-  Object.defineProperty(Boolean.prototype, 'action', {
-    get() {
-      return _lastInvClickAction
-    },
-    configurable: true,
-  })
-}
-
 function normalizeEquipSlotId(slotId: string): EquipSlotId {
   if (slotId === 'head') return 'helm'
   if (slotId === 'mainHand') return 'weapon1'
@@ -1854,18 +1829,6 @@ export class InventoryPanel {
     return false
   }
 
-  /**
-   * Deduct gold from inventory to drop. Returns actual amount deducted.
-   */
-  dropGold(amount: number): number {
-    if (!Number.isFinite(amount) || amount <= 0) return 0
-    const current = this.gold
-    const toDrop = Math.max(0, Math.min(Math.floor(amount), current))
-    if (toDrop <= 0) return 0
-    this.gold = current - toDrop
-    return toDrop
-  }
-
   /**
    * Handle left-click on a grid cell `(col, row)`:
    * - If `cursorItem` is null: pick up the item at `(col, row)` into `cursorItem`.
@@ -1877,7 +1840,6 @@ export class InventoryPanel {
    */
   clickGridCell(col: number, row: number): boolean {
     if (col < 0 || row < 0 || col >= INV_GRID_ORIGIN.cols || row >= INV_GRID_ORIGIN.rows) {
-      _lastInvClickCursorItem = this.cursorItem
       return false
     }
     if (!this.cursorItem) {
@@ -1885,12 +1847,10 @@ export class InventoryPanel {
         p => col >= p.col && col < p.col + p.item.invWidth && row >= p.row && row < p.row + p.item.invHeight,
       )
       if (!hit) {
-        _lastInvClickCursorItem = null
         return false
       }
       this.gridItems = this.gridItems.filter(p => p !== hit)
       this.cursorItem = hit.item
-      _lastInvClickCursorItem = this.cursorItem
       return true
     }
 
@@ -1910,7 +1870,6 @@ export class InventoryPanel {
         } else {
           this.cursorItem = null
         }
-        _lastInvClickCursorItem = this.cursorItem
         return true
       }
     }
@@ -1922,12 +1881,10 @@ export class InventoryPanel {
       } else {
         this.cursorItem = null
       }
-      _lastInvClickCursorItem = this.cursorItem
       return true
     }
 
     if (!directHit && (col + this.cursorItem.invWidth > INV_GRID_ORIGIN.cols || row + this.cursorItem.invHeight > INV_GRID_ORIGIN.rows)) {
-      _lastInvClickCursorItem = this.cursorItem
       return false
     }
 
@@ -1937,7 +1894,6 @@ export class InventoryPanel {
     if (overlaps.length === 0) {
       this.gridItems.push({ item: this.cursorItem, col: targetCol, row: targetRow })
       this.cursorItem = null
-      _lastInvClickCursorItem = this.cursorItem
       return true
     }
     if (overlaps.length === 1) {
@@ -1954,7 +1910,6 @@ export class InventoryPanel {
           } else {
             this.cursorItem = null
           }
-          _lastInvClickCursorItem = this.cursorItem
           return true
         }
       }
@@ -1966,16 +1921,13 @@ export class InventoryPanel {
         } else {
           this.cursorItem = null
         }
-        _lastInvClickCursorItem = this.cursorItem
         return true
       }
       this.gridItems = this.gridItems.filter(p => p !== single)
       this.gridItems.push({ item: this.cursorItem, col: targetCol, row: targetRow })
       this.cursorItem = single.item
-      _lastInvClickCursorItem = this.cursorItem
       return true
     }
-    _lastInvClickCursorItem = this.cursorItem
     return false
   }
 
@@ -2057,14 +2009,10 @@ export class InventoryPanel {
     const existing = this.equipped[slotId] ?? null
     if (!this.cursorItem) {
       if (!existing) {
-        _lastInvClickAction = 'none'
-        _lastInvClickCursorItem = null
         return false
       }
       delete this.equipped[slotId]
       this.cursorItem = existing
-      _lastInvClickAction = 'unequip'
-      _lastInvClickCursorItem = this.cursorItem
       return true
     }
     if (existing && canSocketUiItem(this.cursorItem, existing)) {
@@ -2075,19 +2023,13 @@ export class InventoryPanel {
       } else {
         this.cursorItem = null
       }
-      _lastInvClickAction = 'equip'
-      _lastInvClickCursorItem = this.cursorItem
       return true
     }
     if (!this.canEquipItemInSlot(this.cursorItem, slotId)) {
-      _lastInvClickAction = 'none'
-      _lastInvClickCursorItem = this.cursorItem
       return false
     }
     this.equipped[slotId] = this.cursorItem
     this.cursorItem = existing
-    _lastInvClickAction = existing ? 'swap' : 'equip'
-    _lastInvClickCursorItem = this.cursorItem
     return true
   }
 
@@ -2194,7 +2136,8 @@ export class InventoryPanel {
     callbacks?: {
       onOpenCube?: () => void
       onCastTownPortal?: (source?: 'tbk' | 'tsc', item?: UiInventoryItem) => boolean | void
-      onDropGold?: (amount: number) => void
+      /** Inventory gold coin button pressed: open the gold dialog (drop, or deposit while the stash is open). */
+      onGoldButton?: () => void
     },
     button: 0 | 2 = 0,
     externalContainers?: {
@@ -2310,12 +2253,15 @@ export class InventoryPanel {
       return true
     }
 
-    // 5. Gold Coin Button (`goldcoinbtn.dc6` at x=484..504) & Readout Area (x: 484..625, y: 450..485)
+    // 5. Gold coin button (D2Client inventory gold button hit rect, panel-relative x 83..103, y 392..410).
-    if (logicalX >= INV_GOLD_BTN_BOUNDS.x && logicalX <= 625 && logicalY >= 450 && logicalY <= 485) {
+    //    D2 never drops/deposits locally: the button only opens the gold dialog; the amount is chosen there.
-      if (this.gold > 0) {
+    if (
-        const dropAmt = Math.min(10_000, this.gold)
+      logicalX >= INV_PANEL_ORIGIN.x + INV_GOLD_BTN_HIT.relX0 &&
-        callbacks?.onDropGold?.(dropAmt)
+      logicalX <= INV_PANEL_ORIGIN.x + INV_GOLD_BTN_HIT.relX1 &&
-      }
+      logicalY >= INV_PANEL_ORIGIN.y + INV_GOLD_BTN_HIT.relY0 &&
+      logicalY <= INV_PANEL_ORIGIN.y + INV_GOLD_BTN_HIT.relY1
+    ) {
+      if (this.gold > 0) callbacks?.onGoldButton?.()
       return true
     }
 

src/client/ui/world-panels.ts

@@ -40,74 +40,10 @@ import {
 import type { Item } from '../../common/items/items.ts'
 import type { CharacterClassCode } from '../../common/units/classes.ts'
 import { D2Rng } from '../../common/rng/d2-rng.ts'
-import { getTblLang, type TblLang } from '../i18n/lang.ts'
+import { getTblLang, requireTbl, type TblLang } from '../i18n/lang.ts'
+import { STASH_GOLD_CAP } from '../../common/items/inventory-model.ts'
 import { BAKED_UI_MANIFEST } from '../../common/items/baked-ui-meta.ts'
 
-let _lastVendorReason: string | undefined = undefined
-let _lastVendorBoughtCount = 0
-let _lastVendorTotalCost = 0
-let _lastVendorGoldReceived = 0
-
-if (!Object.prototype.hasOwnProperty.call(Boolean.prototype, 'ok')) {
-  Object.defineProperty(Boolean.prototype, 'ok', {
-    get() {
-      return this.valueOf()
-    },
-    configurable: true,
-  })
-}
-if (!Object.prototype.hasOwnProperty.call(Boolean.prototype, 'reason')) {
-  Object.defineProperty(Boolean.prototype, 'reason', {
-    get() {
-      return _lastVendorReason
-    },
-    configurable: true,
-  })
-}
-if (!Object.prototype.hasOwnProperty.call(Boolean.prototype, 'boughtCount')) {
-  Object.defineProperty(Boolean.prototype, 'boughtCount', {
-    get() {
-      return _lastVendorBoughtCount
-    },
-    configurable: true,
-  })
-}
-if (!Object.prototype.hasOwnProperty.call(Boolean.prototype, 'totalCost')) {
-  Object.defineProperty(Boolean.prototype, 'totalCost', {
-    get() {
-      return _lastVendorTotalCost
-    },
-    configurable: true,
-  })
-}
-if (!Object.prototype.hasOwnProperty.call(Boolean.prototype, 'goldReceived')) {
-  Object.defineProperty(Boolean.prototype, 'goldReceived', {
-    get() {
-      return _lastVendorGoldReceived
-    },
-    configurable: true,
-  })
-}
-
-function makeVendorBuyResult(
-  ok: boolean,
-  boughtCount: number,
-  totalCost: number,
-  reason?: string,
-): { ok: boolean; reason?: string; boughtCount: number; totalCost: number } & boolean {
-  _lastVendorReason = reason
-  _lastVendorBoughtCount = boughtCount
-  _lastVendorTotalCost = totalCost
-  return ok as any
-}
-
-function makeVendorSellResult(
-  ok: boolean,
-  goldReceived: number,
-): { ok: boolean; goldReceived: number } & boolean {
-  _lastVendorGoldReceived = goldReceived
-  return ok as any
-}
 import {
   type TownNpcServiceDescriptor,
   type VendorNpcId,
@@ -117,9 +53,6 @@ import {
   getLocalizedNpcGreetings,
 } from '../../common/units/npc-table.ts'
 import type { VendorTabId } from '../../common/items/vendor-generator.ts'
-import { VendorSessionManager } from '../../common/items/vendor-service.ts'
-import { getEmbeddedDropTables } from '../../common/items/embedded-drop-tables.ts'
-import { isItemRepairable } from '../../common/items/item-cost.ts'
 import { CANONICAL_CHI_TBL_DICT, CANONICAL_ENG_TBL_DICT } from '../../common/data/canonical-tbl-strings.ts'
 import { CANONICAL_ELITE_MODIFIERS, monsterDisplayName } from '../../common/units/monsters-data.ts'
 import { getSocketableInfo, isJewelCode } from '../../common/items/gems-data.ts'
@@ -129,6 +62,7 @@ import {
 } from '../../common/items/runeword-socket.ts'
 
 export {
+  STASH_GOLD_CAP,
   GRID_ITEM_BG_BLUE,
   GRID_ITEM_BG_GREEN,
   GRID_ITEM_BG_RED,
@@ -141,8 +75,10 @@ export type LeftDockPanelKind = 'none' | 'char' | 'quest' | 'waypoint' | 'stash'
 
 export const STASH_PANEL_ORIGIN = { x: 80, y: 60, width: 320, height: 432, w: 320, h: 432 } as const
 export const STASH_GRID_ORIGIN = { x: 80 + 74, y: 60 + 82, cols: 6, rows: 8, cellPx: 29 } as const
-export const STASH_GOLD_CAP = 2_500_000
+/** Panel-relative click rect of the stash gold coin button (inclusive, D2Client stash panel). */
-export const PLAYER_GOLD_CAP = 2_500_000
+export const STASH_GOLD_BTN_HIT = { relX0: 73, relX1: 150, relY0: 24, relY1: 41 } as const
+
+/** Packed canonical tbl lookup that fails fast when the key was not packed. */
 export const STASH_CLOSE_BTN_BOUNDS = { x: 80 + 272, y: 60 + 388, w: 32, h: 32 } as const
 
 /**
@@ -376,6 +312,12 @@ export const VENDOR_TABS: readonly {
   { id: 'misc', index: 3, xOffset: 240, width: 79, height: 31, centerX: 281, textY: 20, strIdx: 4039, labelZh: '其他', labelEn: 'Misc' },
 ] as const
 
+/**
+ * MonStats classes whose NPC menu offers "gamble" in 1.13c: Gheed (147), Elzix (199), Alkor (254),
+ * Jamella (405), Anya (512), Nihlathak (514); matches `TownNpcServiceDescriptor.canGamble`.
+ */
+export const GAMBLE_NPC_CLASS_IDS: ReadonlySet<number> = new Set([147, 199, 254, 405, 512, 514])
+
 export type NpcMenuActionId = 'talk' | 'trade' | 'gamble' | 'identify' | 'cancel'
 
 export interface NpcMenuOption {
@@ -710,23 +652,15 @@ export class WorldPanelsHud {
   lang: TblLang = getTblLang()
   selectedActTab = 1
   selectedQuestIdx = 0
-  /** Server stat 15 (`goldbank`); 0 until received. */
+  /** Server stat 15 (`goldbank`), written by `HudModel` only; 0 until received (absent stat = 0). */
-  private _stashGold = 0
+  stashGold = 0
-  private _stashGoldExplicitlySet = false
-  get stashGold(): number {
-    return this._stashGold
-  }
-  set stashGold(val: number) {
-    this._stashGold = Math.max(0, Math.floor(Number.isFinite(val) ? val : 0))
-    this._stashGoldExplicitlySet = true
-  }
   private _starterStashCleared = false
-  private readonly vendorRng = new D2Rng(0x56454e44)
-  private vendorBuySeq = 0
   cubeTransmuteCount = 0
   escapeMenuOpen = false
   lastTooltipRect: { bx: number; by: number; boxW: number; boxH: number } | null = null
   npcMenu: {
+    /** Server unit id of the NPC (from `NpcInit`); `null` for menus opened without a server unit. */
+    npcId: number | null
     npcName: string
     x: number
     y: number
@@ -737,14 +671,6 @@ export class WorldPanelsHud {
     hoveredOptionIdx?: number | null | undefined
   } | null = null
 
-  private _vendorSession: VendorSessionManager | null = null
-  get vendorSession(): VendorSessionManager {
-    if (!this._vendorSession) {
-      this._vendorSession = new VendorSessionManager(getEmbeddedDropTables())
-    }
-    return this._vendorSession
-  }
-
   private _clearStarterStashIfRawItem(item: UiInventoryItem | null | undefined): void {
     if (!this._starterStashCleared && item && !Array.isArray((item as any).allowedSlots)) {
       this._starterStashCleared = true
@@ -755,7 +681,13 @@ export class WorldPanelsHud {
   activeVendorDescriptor: TownNpcServiceDescriptor | null = null
   vendorMode: 'trade' | 'gamble' = 'trade'
   activeVendorTab: VendorTabId = 'armor'
-  vendorDifficulty: 0 | 1 | 2 = 0
+  /** Server unit id of the NPC whose store is open (`ClientWorld.npcInteraction.npcId`); `null` when closed. */
+  vendorNpcId: number | null = null
+  /**
+   * "Repair all equipment: %d" total (patchstring 10095), computed by `HudModel` from its injected
+   * `VendorRepairAllFn`; `null` when no repair-capable store is open.
+   */
+  vendorRepairAllCost: number | null = null
   /** Synced from the server character level by `HudManager.syncPlayerContext()`. */
   vendorCharLevel = 0
   vendorPlayerStats: PlayerItemRequirementContext = {
@@ -980,11 +912,13 @@ export class WorldPanelsHud {
     descriptor: TownNpcServiceDescriptor,
     screenX = 400,
     screenY = 220,
+    npcId: number | null = null,
   ): void {
     const options = this.buildNpcMenuOptions(descriptor)
     // D2Client.dll 0x6fb53829 -> 0x6fb53370: first selectable line (option index 0) is selected on open.
     // Box position clamping is performed dynamically in computeNpcDialogLayout (0x6fb53580).
     this.npcMenu = {
+      npcId,
       npcName: descriptor.displayName,
       x: Math.round(screenX),
       y: Math.round(screenY),
@@ -1003,68 +937,80 @@ export class WorldPanelsHud {
     return true
   }
 
-  openVendorForNpc(
+  /**
-    descriptorOrName: TownNpcServiceDescriptor | VendorNpcId | string,
+   * Show the store the server filled with `0x9C AddToShop` items (`ClientWorld.containers.shop`).
-    mode: 'trade' | 'gamble' = 'trade',
+   * `pages`: one entry per shop item with its bitstream `storePage` (1..4 -> tab index 0..3, D2Client
-    cLvl = 85,
+   * 0x6fb91178 tab table). Re-applying the same store keeps the selected tab unless it became empty
-    difficulty: 0 | 1 | 2 | 'normal' | 'nightmare' | 'hell' = 0,
+   * (D2Client 0x6fb3f710 advances to the next non-empty tab).
-  ): boolean {
+   */
-    const descriptor =
+  setVendorShop(p: {
-      typeof descriptorOrName === 'object'
+    readonly npcId: number
-        ? descriptorOrName
+    readonly descriptor: TownNpcServiceDescriptor
-        : typeof descriptorOrName === 'number'
+    readonly mode: 'trade' | 'gamble'
-        ? getTownNpcDescriptorByVendorId(descriptorOrName)
+    readonly items: readonly { readonly storePage: number; readonly placement: GridPlacement }[]
-        : getTownNpcDescriptorByName(descriptorOrName)
+  }): void {
-    if (!descriptor || descriptor.vendorId === null) return false
+    // Fail fast against the D2Client.dll 0x6fb3f430 button layout table.
-
+    resolveVendorButtonLayout(p.descriptor.hcIdx, p.mode)
-    const diffNum: 0 | 1 | 2 =
+    const sameStore =
-      difficulty === 'hell' || difficulty === 2
+      this.vendorNpcId === p.npcId &&
-        ? 2
+      this.vendorMode === p.mode &&
-        : difficulty === 'nightmare' || difficulty === 1
+      this.activeVendorDescriptor?.hcIdx === p.descriptor.hcIdx
-        ? 1
+    if (!sameStore) {
-        : 0
-
-    // Fail-fast validation against D2Client.dll 0x6fb3f430 button layout table
-    resolveVendorButtonLayout(descriptor.hcIdx, mode)
-
-    this.activeVendorDescriptor = descriptor
-    this.vendorMode = mode
-    this.vendorCharLevel = Math.max(1, cLvl)
-    this.vendorDifficulty = diffNum
       this.vendorTradeState = 'idle'
       this.hoveredVendorButtonSlot = null
       this.pressedMomentarySlot = null
       this.hoveredVendorItem = null
-
+    }
-    const tables = getEmbeddedDropTables()
+    this.activeVendorDescriptor = p.descriptor
-    const vendorId = descriptor.vendorId
+    this.vendorNpcId = p.npcId
-
+    this.vendorMode = p.mode
-    if (mode === 'gamble') {
+    const tabs: Record<VendorTabId, GridPlacement[]> = { armor: [], weapons1: [], weapons2: [], misc: [] }
-      const gambleInv = this.vendorSession.getOrCreateGambleStore(vendorId, this.vendorCharLevel)
+    const gamble: GridPlacement[] = []
-      this.gamblePlacements = gambleInv.getAllItems().map(p => {
+    for (const entry of p.items) {
-        const buyCost = this.vendorSession.getBuyPrice(p.item, vendorId, diffNum, this.vendorCharLevel, true)
+      if (p.mode === 'gamble') {
-        const uiItem = itemToUiInventoryItem({ ...(p.item as any), buyCost, isGambleMystery: true }, tables)
+        gamble.push(entry.placement)
-        return { item: uiItem, col: p.x, row: p.y }
+        continue
-      })
+      }
+      const tab = VENDOR_TABS[entry.storePage - 1]
+      if (!tab) throw new Error(`setVendorShop: shop item store page ${entry.storePage} is outside 1..4`)
+      tabs[tab.id].push(entry.placement)
+    }
+    this.vendorTabPlacements = tabs
+    this.gamblePlacements = gamble
+    if (p.mode === 'gamble') {
       this.activeVendorTab = 'armor'
-      return true
+    } else if (!sameStore) {
-    }
+      // D2Client.dll 0x6fb411a0 -> 0x6fb3f710(0): start at tab 0 and cycle to the first non-empty tab.
-
-    const store = this.vendorSession.getOrCreateVendorStore(vendorId, diffNum, this.vendorCharLevel)
-    const tabIds: VendorTabId[] = ['armor', 'weapons1', 'weapons2', 'misc']
-    for (const tabId of tabIds) {
-      const inv = store.tabs[tabId]
-      this.vendorTabPlacements[tabId] = inv.getAllItems().map(p => {
-        const buyCost = this.vendorSession.getBuyPrice(p.item, vendorId, diffNum, this.vendorCharLevel, false)
-        const sellCost = this.vendorSession.getSellPrice(p.item, vendorId, diffNum, this.vendorCharLevel)
-        const uiItem = itemToUiInventoryItem({ ...(p.item as any), buyCost, sellCost }, tables)
-        return { item: uiItem, col: p.x, row: p.y }
-      })
-    }
-
-    // D2Client.dll 0x6fb411a0 -> 0x6fb3f710(0): start at tab 0 ('armor') and cycle to first non-empty tab
       this.selectVendorTab('armor')
-    return true
+    } else if (this.vendorTabPlacements[this.activeVendorTab].length === 0) {
+      this.selectVendorTab(this.activeVendorTab)
+    }
+    if (this.hoveredVendorItem && !this.getActiveVendorPlacements().some(pl => pl.item.id === this.hoveredVendorItem!.item.id)) {
+      this.hoveredVendorItem = null
+    }
+  }
+
+  /** Forget the store (NpcCancel sent: D2Client frees the store units, the server sends no RemoveFromShop). */
+  clearVendorShop(): void {
+    this.activeVendorDescriptor = null
+    this.vendorNpcId = null
+    this.vendorMode = 'trade'
+    this.vendorTradeState = 'idle'
+    this.vendorRepairAllCost = null
+    this.hoveredVendorButtonSlot = null
+    this.pressedMomentarySlot = null
+    this.hoveredVendorItem = null
+    this.vendorTabPlacements = { armor: [], weapons1: [], weapons2: [], misc: [] }
+    this.gamblePlacements = []
+    this.activeVendorTab = 'armor'
+  }
+
+  /** Repair-all total set by `HudModel`; throws when the store has a Repair All button but no cost was provided. */
+  requireRepairAllCost(): number {
+    if (this.vendorRepairAllCost === null) {
+      throw new Error('WorldPanelsHud: Repair All cost not provided (HudModel needs a VendorRepairAllFn)')
+    }
+    return this.vendorRepairAllCost
   }
 
   getActiveVendorPlacements(): GridPlacement[] {
@@ -1074,376 +1020,6 @@ export class WorldPanelsHud {
     return this.vendorTabPlacements[this.activeVendorTab] ?? []
   }
 
-  getPlayerItemSellPrice(item: UiInventoryItem): number {
-    if (item.sellCost !== undefined) return item.sellCost
-    const vendorId = this.activeVendorDescriptor?.vendorId ?? (0 as VendorNpcId)
-    if (item.rawItem) {
-      return this.vendorSession.getSellPrice(item.rawItem, vendorId, this.vendorDifficulty, this.vendorCharLevel)
-    }
-    if ((item as any).baseCost !== undefined && Number.isFinite((item as any).baseCost)) {
-      return Math.max(1, Math.floor((item as any).baseCost / 2))
-    }
-    return Math.max(1, Math.floor(150))
-  }
-
-  getPlayerItemRepairPrice(item: UiInventoryItem): number {
-    if (!item.durability || item.durability.current >= item.durability.max) return 0
-    if (item.ethereal) return 0
-    const vendorId = this.activeVendorDescriptor?.vendorId ?? (2 as VendorNpcId)
-    if (item.rawItem) {
-      const syncedRaw = {
-        ...item.rawItem,
-        durability: item.durability.current,
-        maxDurability: item.durability.max,
-      }
-      if (!isItemRepairable(syncedRaw)) return 0
-      return this.vendorSession.getRepairPrice(syncedRaw, vendorId, this.vendorDifficulty, this.vendorCharLevel)
-    }
-    const lost = Math.max(0, item.durability.max - item.durability.current)
-    return Math.max(1, lost * 12)
-  }
-
-  buyFromActiveVendor(
-    col: number,
-    row: number,
-    playerInventory: InventoryPanel,
-    isShiftClick = false,
-  ): { ok: boolean; reason?: string; boughtCount: number; totalCost: number } {
-    if (!this.activeVendorDescriptor || this.activeVendorDescriptor.vendorId === null) {
-      return makeVendorBuyResult(false, 0, 0, 'no_vendor')
-    }
-    const vendorId = this.activeVendorDescriptor.vendorId
-    const placements = this.getActiveVendorPlacements()
-    const hitIdx = placements.findIndex(
-      p => col >= p.col && col < p.col + p.item.invWidth && row >= p.row && row < p.row + p.item.invHeight,
-    )
-    if (hitIdx === -1) {
-      return makeVendorBuyResult(false, 0, 0, 'empty_cell')
-    }
-    const hit = placements[hitIdx]!
-    const unitCost = hit.item.buyCost ?? 1
-
-    if (playerInventory.gold < unitCost) {
-      this.showVendorStatus(this.lang === 'ENG' ? 'Not enough gold' : '金币不足', 'red')
-      return makeVendorBuyResult(false, 0, 0, 'not_enough_gold')
-    }
-
-    const tables = getEmbeddedDropTables()
-
-    // Gamble Mode: resolve mystery item into concrete rolled item!
-    if (this.vendorMode === 'gamble') {
-      const freeSlot = findFreeGridSlot(playerInventory.gridItems, hit.item.invWidth, hit.item.invHeight)
-      if (!freeSlot) {
-        this.showVendorStatus(this.lang === 'ENG' ? 'Inventory full' : '背包空间不足', 'red')
-        return makeVendorBuyResult(false, 0, 0, 'inventory_full')
-      }
-      const gambleRes = this.vendorSession.buyGambleItem(
-        vendorId,
-        hit.col,
-        hit.row,
-        playerInventory.gold,
-        this.vendorCharLevel,
-      )
-      if (!gambleRes.success || !gambleRes.item) {
-        this.showVendorStatus(this.lang === 'ENG' ? 'Cannot gamble this item' : '无法赌博该物品', 'red')
-        return makeVendorBuyResult(false, 0, 0, gambleRes.error ?? 'gamble_failed')
-      }
-      playerInventory.gold = gambleRes.remainingGold
-      const sellCost = this.vendorSession.getSellPrice(gambleRes.item, vendorId, this.vendorDifficulty, this.vendorCharLevel)
-      const resolvedUi = itemToUiInventoryItem({ ...(gambleRes.item as any), sellCost }, tables)
-      playerInventory.gridItems.push({ item: resolvedUi, col: freeSlot.col, row: freeSlot.row })
-      this.gamblePlacements.splice(hitIdx, 1)
-      this.showVendorStatus(
-        this.lang === 'ENG' ? `Gambled: ${resolvedUi.name}` : `赌博获得: ${resolvedUi.nameZh}`,
-        'gold',
-      )
-      return makeVendorBuyResult(true, 1, gambleRes.goldSpent)
-    }
-
-    // Trade Mode: Shift-Click bulk buy for Scrolls/Potions/Keys
-    const isScrollOrPotionOrKey =
-      hit.item.permStore &&
-      (hit.item.code === 'tsc' ||
-        hit.item.code === 'isc' ||
-        hit.item.code === 'key' ||
-        hit.item.code === 'yps' ||
-        hit.item.code === 'vps' ||
-        hit.item.code === 'wms' ||
-        hit.item.code.startsWith('hp') ||
-        hit.item.code.startsWith('mp'))
-
-    const maxCopies = isShiftClick && isScrollOrPotionOrKey ? 8 : 1
-    let boughtCount = 0
-    let totalCost = 0
-
-    for (let i = 0; i < maxCopies; i++) {
-      if (playerInventory.gold < unitCost) break
-      const freeSlot = findFreeGridSlot(playerInventory.gridItems, hit.item.invWidth, hit.item.invHeight)
-      if (!freeSlot) {
-        if (boughtCount === 0) {
-          this.showVendorStatus(this.lang === 'ENG' ? 'Inventory full' : '背包空间不足', 'red')
-          return makeVendorBuyResult(false, 0, 0, 'inventory_full')
-        }
-        break
-      }
-      playerInventory.gold -= unitCost
-      totalCost += unitCost
-      boughtCount++
-
-      const rawClone = hit.item.rawItem
-        ? { ...hit.item.rawItem, uniqueId: this.vendorRng.randRange(1, 0x7fffffff), permStore: false }
-        : undefined
-      const sellCost = rawClone
-        ? this.vendorSession.getSellPrice(rawClone, vendorId, this.vendorDifficulty, this.vendorCharLevel)
-        : Math.max(1, Math.floor(unitCost / 2))
-
-      const clonedUiItem: UiInventoryItem = {
-        ...hit.item,
-        id: `item-${hit.item.code}-v${++this.vendorBuySeq}-${this.vendorRng.randRange(10000, 99999)}`,
-        ...(rawClone ? { rawItem: rawClone } : {}),
-        sellCost,
-      }
-      delete (clonedUiItem as any).buyCost
-      delete (clonedUiItem as any).permStore
-
-      playerInventory.gridItems.push({ item: clonedUiItem, col: freeSlot.col, row: freeSlot.row })
-
-      if (!hit.item.permStore) {
-        placements.splice(hitIdx, 1)
-        if (this.vendorMode === 'trade' && placements.length === 0) {
-          this.selectVendorTab(this.activeVendorTab)
-        }
-        break
-      }
-    }
-
-    if (boughtCount > 0) {
-      this.showVendorStatus(
-        this.lang === 'ENG'
-          ? `Bought ${hit.item.name}${boughtCount > 1 ? ` x${boughtCount}` : ''} (-${totalCost} Gold)`
-          : `已购买 ${hit.item.nameZh}${boughtCount > 1 ? ` x${boughtCount}` : ''} (-${totalCost} 金币)`,
-        'gold',
-      )
-      return makeVendorBuyResult(true, boughtCount, totalCost)
-    }
-    return makeVendorBuyResult(false, 0, 0, 'purchase_failed')
-  }
-
-  sellToActiveVendor(
-    rawItem: UiInventoryItem | Item,
-    playerInventory: InventoryPanel,
-  ): { ok: boolean; goldReceived: number } {
-    const item = rawItem as UiInventoryItem
-    if (!this.activeVendorDescriptor || this.activeVendorDescriptor.vendorId === null) {
-      return makeVendorSellResult(false, 0)
-    }
-    const vendorId = this.activeVendorDescriptor.vendorId
-    // Quest items cannot be sold
-    if (item.rawItem?.base?.quest && item.rawItem.base.quest > 0) {
-      this.showVendorStatus(
-        this.lang === 'ENG' ? 'Cannot sell quest item' : '任务物品无法出售',
-        'red',
-      )
-      return makeVendorSellResult(false, 0)
-    }
-
-    const sellPrice = this.getPlayerItemSellPrice(item)
-    playerInventory.gold = Math.min(
-      getInventoryGoldLimit(playerInventory.playerLevel),
-      playerInventory.gold + sellPrice,
-    )
-
-    const invIdx = playerInventory.gridItems.findIndex(
-      p => p.item === item || (item.id !== undefined && p.item.id === item.id),
-    )
-    if (invIdx !== -1) {
-      playerInventory.gridItems.splice(invIdx, 1)
-    }
-
-    // Place into vendor store tab for buyback (unless in gamble mode or item is permStore)
-    if (this.vendorMode === 'trade' && !item.permStore) {
-      const allowed = Array.isArray(item.allowedSlots) ? item.allowedSlots : []
-      const kind =
-        item.rawItem?.base?.kind ??
-        (item as any).type ??
-        (allowed.includes('weapon1') ? 'weapon' : allowed.length > 0 ? 'armor' : 'misc')
-      let targetTab: VendorTabId = kind === 'armor' ? 'armor' : kind === 'weapon' ? 'weapons1' : 'misc'
-      let tabPlacements = this.vendorTabPlacements[targetTab]
-      let freeSlot = findFreeGridSlot(tabPlacements, item.invWidth, item.invHeight, 10, 10)
-      if (!freeSlot && targetTab === 'weapons1') {
-        targetTab = 'weapons2'
-        tabPlacements = this.vendorTabPlacements[targetTab]
-        freeSlot = findFreeGridSlot(tabPlacements, item.invWidth, item.invHeight, 10, 10)
-      }
-      while (!freeSlot) {
-        const evictIdx = tabPlacements.findIndex(p => !p.item.permStore)
-        if (evictIdx === -1) break
-        tabPlacements.splice(evictIdx, 1)
-        freeSlot = findFreeGridSlot(tabPlacements, item.invWidth, item.invHeight, 10, 10)
-      }
-      if (freeSlot) {
-        const buybackPrice = item.rawItem
-          ? this.vendorSession.getBuyPrice(item.rawItem, vendorId, this.vendorDifficulty, this.vendorCharLevel, false)
-          : Math.max(sellPrice * 2, 2)
-        const buybackUi: UiInventoryItem = {
-          ...item,
-          buyCost: buybackPrice,
-          sellCost: sellPrice,
-          permStore: false,
-        }
-        tabPlacements.push({ item: buybackUi, col: freeSlot.col, row: freeSlot.row })
-        if (this.vendorTabPlacements[this.activeVendorTab].length === 0) {
-          this.selectVendorTab(targetTab)
-        }
-      }
-    }
-
-    this.showVendorStatus(
-      this.lang === 'ENG'
-        ? `Sold ${item.name} (+${sellPrice} Gold)`
-        : `已出售 ${item.nameZh} (+${sellPrice} 金币)`,
-      'gold',
-    )
-    return makeVendorSellResult(true, sellPrice)
-  }
-
-  repairSingleUiItem(
-    item: UiInventoryItem,
-    playerInventory: InventoryPanel,
-  ): { ok: boolean; cost: number } {
-    if (!this.activeVendorDescriptor?.canRepair) {
-      return { ok: false, cost: 0 }
-    }
-    if (!item.durability || item.durability.current >= item.durability.max) {
-      this.showVendorStatus(
-        this.lang === 'ENG' ? 'Item does not need repair' : '该物品无需修理',
-        'tan',
-      )
-      return { ok: false, cost: 0 }
-    }
-    if (item.ethereal) {
-      this.showVendorStatus(
-        this.lang === 'ENG' ? 'Cannot repair ethereal item' : '无形物品无法修理',
-        'red',
-      )
-      return { ok: false, cost: 0 }
-    }
-    const cost = this.getPlayerItemRepairPrice(item)
-    if (cost <= 0) return { ok: false, cost: 0 }
-    if (playerInventory.gold < cost) {
-      this.showVendorStatus(
-        this.lang === 'ENG' ? 'Not enough gold to repair' : '金币不足，无法修理',
-        'red',
-      )
-      return { ok: false, cost: 0 }
-    }
-    playerInventory.gold -= cost
-    ;(item as { durability: { current: number; max: number } }).durability = {
-      current: item.durability.max,
-      max: item.durability.max,
-    }
-    if (item.rawItem) {
-      item.rawItem.durability = item.durability.max
-    }
-    this.showVendorStatus(
-      this.lang === 'ENG'
-        ? `Repaired ${item.name} (-${cost} Gold)`
-        : `已修理 ${item.nameZh} (-${cost} 金币)`,
-      'gold',
-    )
-    return { ok: true, cost }
-  }
-
-  private collectRepairablePlayerItems(playerInventory: InventoryPanel): { item: UiInventoryItem; cost: number }[] {
-    const allItems: UiInventoryItem[] = [
-      ...(Object.values(playerInventory.equipped).filter(Boolean) as UiInventoryItem[]),
-      ...playerInventory.gridItems.map(p => p.item),
-    ]
-    const result: { item: UiInventoryItem; cost: number }[] = []
-    for (const item of allItems) {
-      if (!item.durability || item.durability.current >= item.durability.max || item.ethereal) continue
-      const cost = this.getPlayerItemRepairPrice(item)
-      if (cost <= 0) continue
-      result.push({ item, cost })
-    }
-    return result
-  }
-
-  /**
-   * D2Client.dll `0x6fb3f260` -> D2Common `0x6fabc99a` (`#10095`):
-   * Computes total repair cost across all damaged repairable equipment and inventory items.
-   */
-  getRepairAllCost(playerInventory?: InventoryPanel | null): number {
-    if (!this.activeVendorDescriptor?.canRepair) return 0
-    const inv = playerInventory ?? this.activePlayerInventory
-    if (!inv) return 0
-    let total = 0
-    for (const entry of this.collectRepairablePlayerItems(inv)) {
-      total += entry.cost
-    }
-    return total
-  }
-
-  repairAllUiItems(playerInventory: InventoryPanel): { repairedCount: number; totalCost: number } {
-    if (!this.activeVendorDescriptor?.canRepair) {
-      return { repairedCount: 0, totalCost: 0 }
-    }
-    let repairedCount = 0
-    let totalCost = 0
-    for (const { item, cost } of this.collectRepairablePlayerItems(playerInventory)) {
-      if ( !item.durability) continue
-      if (playerInventory.gold < cost) break
-      const maxDur = item.durability.max
-      playerInventory.gold -= cost
-      totalCost += cost
-      repairedCount++
-      ;(item as { durability: { current: number; max: number } }).durability = {
-        current: maxDur,
-        max: maxDur,
-      }
-      if (item.rawItem) {
-        item.rawItem.durability = maxDur
-      }
-    }
-    if (repairedCount > 0) {
-      this.showVendorStatus(
-        this.lang === 'ENG'
-          ? `Repaired ${repairedCount} items (-${totalCost} Gold)`
-          : `已修理 ${repairedCount} 件装备 (-${totalCost} 金币)`,
-        'gold',
-      )
-    } else {
-      this.showVendorStatus(
-        this.lang === 'ENG' ? 'All equipment is at full durability' : '所有装备完好，无需修理',
-        'tan',
-      )
-    }
-    return { repairedCount, totalCost }
-  }
-
-  identifyAllUiItems(playerInventory: InventoryPanel): number {
-    let count = 0
-    for (const placed of playerInventory.gridItems) {
-      if (isUiItemUnidentified(placed.item)) {
-        identifyUiItem(placed.item)
-        count++
-      }
-    }
-    for (const placed of this.stashItems) {
-      if (isUiItemUnidentified(placed.item)) {
-        identifyUiItem(placed.item)
-        count++
-      }
-    }
-    for (const placed of this.cubeItems) {
-      if (isUiItemUnidentified(placed.item)) {
-        identifyUiItem(placed.item)
-        count++
-      }
-    }
-    return count
-  }
-
   /** Runtime quest status overrides: questId -> 'completed' | 'active' | 'locked' */
   private questStatuses = new Map<string, 'completed' | 'active' | 'locked'>()
   private cachedQuestsAtlasImg: HTMLImageElement | null = null
@@ -1962,36 +1538,6 @@ export class WorldPanelsHud {
     return true
   }
 
-  depositGold(amount: number, playerInventory: { gold: number }): number {
-    if (amount <= 0) return 0
-    if (!this._stashGoldExplicitlySet) {
-      this._stashGold = 0
-      this._stashGoldExplicitlySet = true
-    }
-    const available = Math.max(0, Math.min(amount, playerInventory.gold, STASH_GOLD_CAP - this._stashGold))
-    if (available <= 0) return 0
-    playerInventory.gold -= available
-    this._stashGold += available
-    return available
-  }
-
-  withdrawGold(
-    amount: number,
-    playerInventory: { gold: number; maxGold?: number; _playerLevelExplicitlySet?: boolean },
-  ): number {
-    if (amount <= 0) return 0
-    const cap =
-      playerInventory._playerLevelExplicitlySet &&
-      playerInventory.maxGold !== undefined
-        ? playerInventory.maxGold
-        : PLAYER_GOLD_CAP
-    const available = Math.max(0, Math.min(amount, this._stashGold, cap - playerInventory.gold))
-    if (available <= 0) return 0
-    this._stashGold -= available
-    playerInventory.gold += available
-    return available
-  }
-
   handleMouseMove(logicalX: number, logicalY: number): void {
     this.hoveredStashItem = null
     this.hoveredCubeItem = null
@@ -2140,6 +1686,8 @@ export class WorldPanelsHud {
     callbacks: {
       onOpenVendor: (descriptor: TownNpcServiceDescriptor, mode: 'trade' | 'gamble') => void
       onIdentifyAll: (descriptor: TownNpcServiceDescriptor) => void
+      /** Menu dismissed (`cancel` option or click outside): the caller sends `NpcCancel` (0x30). */
+      onCancel: () => void
     },
     font?: Pick<D2FontRenderer, 'measureText'> | null,
   ): boolean {
@@ -2165,6 +1713,7 @@ export class WorldPanelsHud {
       logicalY > layout.top + layout.height
     ) {
       this.npcMenu = null
+      callbacks.onCancel()
       return true
     }
 
@@ -2186,6 +1735,7 @@ export class WorldPanelsHud {
         callbacks.onIdentifyAll(desc)
       } else {
         this.npcMenu = null
+        callbacks.onCancel()
       }
       return true
     }
@@ -2219,6 +1769,14 @@ export class WorldPanelsHud {
         hitItem: UiInventoryItem | null,
         isRightClick: boolean,
       ) => void
+      /** Stash gold coin button: open the withdraw gold dialog. */
+      onStashGoldButton?: () => void
+      /** Vendor grid click on a store item (buy / gamble). `shiftFill`: Shift held (0x32 shift-fill flag). */
+      onVendorBuy?: (item: UiInventoryItem, shiftFill: boolean) => void
+      /** Vendor grid click while holding a cursor item: sell it (0x33). */
+      onVendorSell?: (item: UiInventoryItem) => void
+      /** Repair All button (0x35 with field4 = 0x80000000). */
+      onVendorRepairAll?: () => void
     },
   ): boolean {
     if (logicalX > 400) return false
@@ -2358,6 +1916,19 @@ export class WorldPanelsHud {
         return true
       }
     } else if (kind === 'stash') {
+      // Stash gold coin button (panel-relative x 73..150, y 24..41): opens the withdraw dialog.
+      if (
+        logicalX >= ox + STASH_GOLD_BTN_HIT.relX0 &&
+        logicalX <= ox + STASH_GOLD_BTN_HIT.relX1 &&
+        logicalY >= oy + STASH_GOLD_BTN_HIT.relY0 &&
+        logicalY <= oy + STASH_GOLD_BTN_HIT.relY1
+      ) {
+        if (!callbacks.isRightClick && this.stashGold > 0) {
+          if (!callbacks.onStashGoldButton) throw new Error('handleLeftDockClick: stash gold button needs onStashGoldButton')
+          callbacks.onStashGoldButton()
+        }
+        return true
+      }
       // Stash 6x8 Grid
       if (
         logicalX >= STASH_GRID_ORIGIN.x &&
@@ -2453,10 +2024,8 @@ export class WorldPanelsHud {
         } else if (btnKind === 'repairAll') {
           this.vendorTradeState = 'idle'
           this.pressedMomentarySlot = hitSlot
-          const inv = callbacks.inventory ?? this.activePlayerInventory
+          if (!callbacks.onVendorRepairAll) throw new Error('handleLeftDockClick: Repair All needs onVendorRepairAll')
-          if (inv) {
+          callbacks.onVendorRepairAll()
-            this.repairAllUiItems(inv)
-          }
         } else if (btnKind === 'close') {
           this.vendorTradeState = 'idle'
           this.pressedMomentarySlot = hitSlot
@@ -2480,21 +2049,20 @@ export class WorldPanelsHud {
         const row = Math.floor((logicalY - VENDOR_GRID_ORIGIN.y) / VENDOR_GRID_ORIGIN.cellPx)
 
         const inv = callbacks.inventory ?? this.activePlayerInventory
-        if (inv) {
+        // Holding a cursor item over the store grid sells it (server answers with 0x2A + item/stat packets).
-          // If player is holding an item on cursor and clicks inside Vendor grid -> Sell it!
+        if (inv?.cursorItem) {
-          if (inv.cursorItem) {
+          if (!callbacks.onVendorSell) throw new Error('handleLeftDockClick: vendor sell needs onVendorSell')
-            const held = inv.cursorItem
+          callbacks.onVendorSell(inv.cursorItem)
-            const res = this.sellToActiveVendor(held, inv)
-            if (res.ok) {
-              inv.cursorItem = null
-            }
           return true
         }
-
+        // Buy works in 'idle' or 'buy' state; never buy while the sell / repair cursor is armed.
-          // Left-click buy works in 'idle' or 'buy' state; do not accidentally buy when in 'sell' or 'repair' state
         if (this.vendorTradeState === 'idle' || this.vendorTradeState === 'buy') {
-            this.buyFromActiveVendor(col, row, inv, Boolean(callbacks.isShiftClick))
+          const hit = this.getActiveVendorPlacements().find(
-            this.handleMouseMove(logicalX, logicalY)
+            p => col >= p.col && col < p.col + p.item.invWidth && row >= p.row && row < p.row + p.item.invHeight,
+          )
+          if (hit) {
+            if (!callbacks.onVendorBuy) throw new Error('handleLeftDockClick: vendor buy needs onVendorBuy')
+            callbacks.onVendorBuy(hit.item, Boolean(callbacks.isShiftClick))
           }
         }
         return true
@@ -2652,14 +2220,14 @@ export class WorldPanelsHud {
       }
     } else if (kind === 'stash') {
       if (assets.stashBgImg) ctx.drawImage(assets.stashBgImg, ox, oy)
-      font.drawText(ctx, isEn ? 'Private Stash' : '私人储物箱', ox + 172, oy + 35, {
+      font.drawText(ctx, requireTbl('bank', this.lang), ox + 172, oy + 35, {
         font: 'font8',
         color: 'gold',
         align: 'center',
       })
       font.drawText(
         ctx,
-        isEn ? `Stash Gold: ${this.stashGold.toLocaleString()}` : `储物箱金币: ${this.stashGold.toLocaleString()}`,
+        `${requireTbl('strGoldInStash', this.lang)} ${this.stashGold}`,
         ox + 160,
         oy + 61,
         {
@@ -2918,9 +2486,7 @@ export class WorldPanelsHud {
         if (spec.enabled) {
           const hoverText =
             btnKind === 'repairAll'
-              ? isEn
+              ? requireTbl('patchstring#95', this.lang).replace('%d', String(this.requireRepairAllCost()))
-                ? `${spec.labelEn}: ${this.getRepairAllCost(assets.inventory)}`
-                : `${spec.labelZh}：${this.getRepairAllCost(assets.inventory)}`
               : isEn
                 ? spec.labelEn
                 : spec.labelZh
@@ -3290,35 +2856,16 @@ export class WorldPanelsHud {
     }
 
     // Vendor Transaction Cost Line (`ITEMS_CalculateTransactionCost` at 0x6FD9B1C0)
+    // Prices come from HudModel's injected VendorPriceFn (buyCost / sellCost / repairCost on the UI item).
     if (item.buyCost !== undefined) {
-      const label = item.isGambleMystery
+      lines.push({ text: `${requireTbl('cost', this.lang)}${item.buyCost}`, color: 'white', font: 'font8' })
-        ? (isEn ? 'Gamble Cost' : '赌博价格')
-        : (isEn ? 'Buy Cost' : '购买价格')
-      const suffix = isEn ? ' Gold' : ' 金币'
-      lines.push({ text: `${label}: ${item.buyCost.toLocaleString()}${suffix}`, color: 'gold', font: 'font8' })
     } else if (vendorOpen && this.activeVendorDescriptor) {
       if (this.repairCursorMode && this.activeVendorDescriptor.canRepair) {
-        const repPrice = this.getPlayerItemRepairPrice(item)
+        if (item.repairCost !== undefined && item.repairCost > 0) {
-        if (repPrice > 0) {
+          lines.push({ text: `${requireTbl('Repair', this.lang)}${item.repairCost}`, color: 'white', font: 'font8' })
-          lines.push({
-            text: isEn
-              ? `Repair Cost: ${repPrice.toLocaleString()} Gold`
-              : `修理费用: ${repPrice.toLocaleString()} 金币`,
-            color: 'gold',
-            font: 'font8',
-          })
-        }
-      } else {
-        const sellPrice = this.getPlayerItemSellPrice(item)
-        if (sellPrice > 0) {
-          lines.push({
-            text: isEn
-              ? `Sell Value: ${sellPrice.toLocaleString()} Gold`
-              : `出售价格: ${sellPrice.toLocaleString()} 金币`,
-            color: 'gold',
-            font: 'font8',
-          })
         }
+      } else if (item.sellCost !== undefined) {
+        lines.push({ text: `${requireTbl('Sell', this.lang)}${item.sellCost}`, color: 'white', font: 'font8' })
       }
     }
 

src/client/world/client-world.ts

@@ -7,8 +7,10 @@
  */
 
 import {
+  ClickButtonId,
   unitTypeFromId,
   type CharClassId,
+  type ClientCommand,
   type Pt,
   type ServerEvent,
   type SkillLevel,
@@ -70,6 +72,32 @@ export interface PortalState {
   readonly flags?: number | undefined
 }
 
+/**
+ * Local NPC/stash interaction state. D2Client tracks this itself: the server never
+ * reports "window closed" (no RemoveFromShop after 0x30, no reply to 0x4F 0x12;
+ * captures 05 and 08). Stash opening is server-driven (0x77 action 0x10, capture 08).
+ */
+export interface NpcInteractionState {
+  /** NPC unit id from the last `NpcInit` (0x2F); `null` after `NpcCancel` (0x30). */
+  readonly npcId: number | null
+  /** Window opened by 0x38 action 1 (`trade`) or 2 (`gamble`). */
+  readonly window: 'none' | 'trade' | 'gamble'
+  /** Set by S2C 0x77 action 0x10, cleared when the client sends 0x4F button 0x12. */
+  readonly stashOpen: boolean
+}
+
+/** One S2C 0x2A NPCTransaction, numbered so the HUD can react to each reply once. */
+export interface NpcTransactionRecord {
+  readonly seq: number
+  readonly result: number
+  readonly flag: number
+  readonly itemId: number
+  readonly gold: number
+}
+
+/** S2C 0x77 ButtonActions action that opens the stash panel (capture 08; D2Client jump table 0x6fb0a520[0x10]). */
+const BUTTON_ACTION_OPEN_STASH = 0x10
+
 /** Largest 1.13c stat id: stat ids are 9 bits wide in the stat bitstream (ItemStatCost.txt). */
 const MAX_D2_STAT_ID = 0x1ff
 
@@ -107,8 +135,55 @@ export class ClientWorld {
   private readonly _chatLog: ChatLogEntry[] = []
   private readonly _soundQueue: SoundQueueEntry[] = []
   private readonly _portals = new Map<number, PortalState>()
+  private _npcInteraction: NpcInteractionState = { npcId: null, window: 'none', stashOpen: false }
+  private _lastNpcTransaction: NpcTransactionRecord | null = null
+  private _npcTransactionSeq = 0
   private readonly _changeListeners = new Set<(ev: ServerEvent) => void>()
 
+  get npcInteraction(): NpcInteractionState {
+    return this._npcInteraction
+  }
+
+  /** Last S2C 0x2A NPCTransaction; display-only (gold/items come from stat and item packets). */
+  get lastNpcTransaction(): NpcTransactionRecord | null {
+    return this._lastNpcTransaction
+  }
+
+  /**
+   * Records the local side effects of an outgoing command, mirroring what D2Client
+   * does when it sends it: 0x38 opens the trade/gamble window and the store is
+   * refilled by 0x9C AddToShop; 0x30 frees the store units (no RemoveFromShop is
+   * sent, capture 05); 0x4F 0x12 closes the stash (no reply, capture 08).
+   */
+  noteOutgoingCommand(cmd: ClientCommand): void {
+    const cur = this._npcInteraction
+    switch (cmd.type) {
+      case 'NpcInit':
+        this._npcInteraction = { ...cur, npcId: cmd.target.id, window: 'none' }
+        break
+      case 'NpcOpenTrade':
+      case 'NpcOpenGamble':
+        this._containers.clearShop()
+        this._npcInteraction = {
+          ...cur,
+          npcId: cmd.npcId,
+          window: cmd.type === 'NpcOpenTrade' ? 'trade' : 'gamble',
+        }
+        break
+      case 'NpcCancel':
+        this._containers.clearShop()
+        this._npcInteraction = { ...cur, npcId: null, window: 'none' }
+        break
+      case 'ClickButton':
+        if (cmd.buttonId === ClickButtonId.CloseStash) {
+          this._npcInteraction = { ...cur, stashOpen: false }
+        }
+        break
+      default:
+        break
+    }
+  }
+
   onChange(cb: (ev: ServerEvent) => void): () => void {
     this._changeListeners.add(cb)
     return () => {
@@ -585,8 +660,17 @@ export class ClientWorld {
       }
 
       case 'Npc': {
-        if (ev.goldRemaining !== undefined) {
+        break
-          this._self.applyStat(14, ev.goldRemaining)
+      }
+
+      case 'NpcTransaction': {
+        // Gold and items are driven by stat 14 and 0x9C/0x9D only (D2Client 0x6fafbc80 ignores [11..14]).
+        this._lastNpcTransaction = {
+          seq: ++this._npcTransactionSeq,
+          result: ev.result,
+          flag: ev.flag,
+          itemId: ev.itemId,
+          gold: ev.gold,
         }
         break
       }
@@ -633,6 +717,9 @@ export class ClientWorld {
 
       case 'Trade': {
         this._trade.lastAction = ev.action
+        if (ev.action === BUTTON_ACTION_OPEN_STASH) {
+          this._npcInteraction = { ...this._npcInteraction, stashOpen: true }
+        }
         if (ev.partnerId !== undefined) {
           this._trade.partnerId = ev.partnerId
         }

src/client/world/inventory.ts

@@ -92,7 +92,15 @@ export class ClientInventoryManager implements ClientItemContainers {
    * Applies an `ItemEvent` from `0x9C` (`WorldItemAction`) or `0x9D` (`OwnedItemAction`).
    */
   applyItemEvent(action: number, item: ItemData, container: ItemContainer, selfId?: number): void {
-    // Removal-to-cursor or shop removal actions:
+    // 0x05 RemoveFromContainer: the item goes to the cursor only when the packet's
+    // location is the cursor (pickup). Selling to an NPC sends act 0x05 with
+    // location 0 (capture 06-d2gs-vendor-buy-sell: 0x22 -> 0x9D act 5 loc 0 ->
+    // 0x2A result 1 flag 3), and the item simply leaves the player's containers.
+    if (action === 0x05 && container !== 'cursor') {
+      this.removeItemById(item.id)
+      return
+    }
+    // Removal-to-cursor actions:
     // 0x05 RemoveFromContainer (to cursor), 0x08 Unequip (to cursor), 0x0F RemoveFromBelt (to cursor)
     if (action === 0x05 || action === 0x08 || action === 0x0f) {
       this.removeItemById(item.id)
@@ -176,6 +184,18 @@ export class ClientInventoryManager implements ClientItemContainers {
     }
   }
 
+  /**
+   * Drops every store unit. The server sends no RemoveFromShop after C2S 0x30
+   * (capture 05-d2gs-vendor-open), so the client frees the store locally.
+   */
+  clearShop(): void {
+    for (const id of this.shop.keys()) {
+      this.allById.delete(id)
+      this.sockets.delete(id)
+    }
+    this.shop.clear()
+  }
+
   clear(): void {
     this.inventory.clear()
     this.equipment.clear()

src/common/data/canonical-tbl-strings.ts

@@ -295,6 +295,7 @@ export const CANONICAL_ENG_TBL_DICT: Readonly<Record<string, string>> = {
   "Baal Throne": "Baal",
   "BaalColdMage": "Death Mage",
   "Baals Minion": "Minion of Destruction",
+  "Back": "cancel",
   "Baezil's Vortex": "Baezil's Vortex",
   "Bahamut's": "Bahamut's",
   "Balrog": "Balrog",
@@ -1779,6 +1780,7 @@ export const CANONICAL_ENG_TBL_DICT: Readonly<Record<string, string>> = {
   "Realgar": "Realgar",
   "ReanimatedHorde": "Reanimated Horde",
   "Red": "Red",
+  "Repair": "Repair cost: ",
   "Resonant": "Resonant",
   "Returned": "Returned",
   "ReturnedArcher": "Returned Archer",
@@ -2018,6 +2020,7 @@ export const CANONICAL_ENG_TBL_DICT: Readonly<Record<string, string>> = {
   "Scintillating": "Scintillating",
   "Scorching": "Condensing",
   "Screaming": "Screaming",
+  "Sell": "Sell value: ",
   "Sensei's": "Sensei's",
   "Septic": "Septic",
   "Seraph's Hymn": "Seraph's Hymn",
@@ -2647,6 +2650,13 @@ export const CANONICAL_ENG_TBL_DICT: Readonly<Record<string, string>> = {
   "Trang-Oul's Guise": "Trang-Oul's Guise",
   "Trang-Oul's Scales": "Trang-Oul's Scales",
   "Trang-Oul's Wing": "Trang-Oul's Wing",
+  "TransactionResults10": "You do not have enough gold for that.",
+  "TransactionResults11": "She cannot come right now.  Try again later.",
+  "TransactionResults4": "You do not have enough free space to do that.",
+  "TransactionResults5": "You already have the maximum number of Mercenaries.",
+  "TransactionResults6": "That item has just been traded.",
+  "TransactionResults8": "Something tells me that you do not have that item.",
+  "TransactionResults9": "I cannot complete that request.",
   "TrappedSoul": "Trapped Soul",
   "Travincal": "Travincal",
   "Treads of Cthon": "Treads of Cthon",
@@ -2911,6 +2921,7 @@ export const CANONICAL_ENG_TBL_DICT: Readonly<Record<string, string>> = {
   "collar": "Collar",
   "compellingorb": "Compelling Orb",
   "cord": "Cord",
+  "cost": "Cost: ",
   "cowl": "Cowl",
   "cqv": "Bolts",
   "crack": "Crack",
@@ -3471,6 +3482,7 @@ export const CANONICAL_ENG_TBL_DICT: Readonly<Record<string, string>> = {
   "of the Wolf": "of the Wolf",
   "of the Wraith": "of the Wraith",
   "of the Yeti": "of the Yeti",
+  "ok": "ok",
   "opl": "Fulminating Potion",
   "opm": "Exploding Potion",
   "ops": "Oil Potion",
@@ -3782,7 +3794,10 @@ export const CANONICAL_ENG_TBL_DICT: Readonly<Record<string, string>> = {
   "strBSArmor": "Armor",
   "strBSMisc": "Misc",
   "strBSWeapons": "Weapons",
+  "strBankGoldDeposit": "How much Gold would you like to deposit?",
+  "strBankGoldWithdraw": "How much Gold would you like to withdraw?",
   "strClose": "Close",
+  "strDropGoldHowMuch": "How much Gold would you like to drop?",
   "strGoldInStash": "Gold in Stash:",
   "strGoldLabel": "Gold",
   "strModAllResistances": "All Resistances +%d",
@@ -4000,7 +4015,8 @@ export const CANONICAL_ENG_TBL_DICT: Readonly<Record<string, string>> = {
   "uniquestoneskin": "Stone Skin",
   "uniquemultishot": "Multiple Shots",
   "UniqueAuraEnchanted": "Aura Enchanted",
-  "strethereal": "Ethereal (Cannot be Repaired)"
+  "strethereal": "Ethereal (Cannot be Repaired)",
+  "patchstring#95": "Repair all equipment: %d"
 }
 
 export const CANONICAL_CHI_TBL_DICT: Readonly<Record<string, string>> = {
@@ -4261,6 +4277,7 @@ export const CANONICAL_CHI_TBL_DICT: Readonly<Record<string, string>> = {
   "Baal Throne": "巴尔",
   "BaalColdMage": "死亡法师",
   "Baals Minion": "毁灭的仆从",
+  "Back": "取消",
   "Baezil's Vortex": "贝西尔的漩涡",
   "Balrog": "巴羅格",
   "Bane": "剋星",
@@ -5611,6 +5628,7 @@ export const CANONICAL_CHI_TBL_DICT: Readonly<Record<string, string>> = {
   "Razortine": "剃刀之叉",
   "ReanimatedHorde": "                ",
   "Red": "紅之",
+  "Repair": "修復費用： ",
   "Returned": "復活的怪物",
   "ReturnedArcher": "復生的弓箭手",
   "ReturnedMage": "復生的法師",
@@ -5682,6 +5700,7 @@ export const CANONICAL_CHI_TBL_DICT: Readonly<Record<string, string>> = {
   "Sazabi's Mental Sheath": "沙撒璧的精神之鞘",
   "Scarab": "聖甲蟲",
   "Schaefer's Hammer": "史恰佛之锤",
+  "Sell": "出售價格： ",
   "Seraph's Hymn": "炽天使之韵",
   "Serpent Lord": "海蛇之王",
   "Serpent's": "海蛇之",
@@ -6249,6 +6268,13 @@ export const CANONICAL_CHI_TBL_DICT: Readonly<Record<string, string>> = {
   "Trang-Oul's Guise": "塔格奥之外装",
   "Trang-Oul's Scales": "塔格奥之鳞",
   "Trang-Oul's Wing": "塔格奥之翼",
+  "TransactionResults10": "你沒有足夠的金錢。",
+  "TransactionResults11": "她現在無法過來，請等一會再試。",
+  "TransactionResults4": "你沒有足夠的放置空間。",
+  "TransactionResults5": "你的傭兵數量已經到達最高人數。",
+  "TransactionResults6": "這項物品剛剛交易掉了。",
+  "TransactionResults8": "有些事指出你並非擁有該項物品。",
+  "TransactionResults9": "我無法完成那個要求。",
   "TrappedSoul": "被困的靈魂",
   "Travincal": "崔凡克",
   "Treads of Cthon": "凱松的征服",
@@ -6495,6 +6521,7 @@ export const CANONICAL_CHI_TBL_DICT: Readonly<Record<string, string>> = {
   "collar": "項圈",
   "compellingorb": "強制球體",
   "cord": "捆綁",
+  "cost": "花費：",
   "cowl": "蒙頭斗蓬",
   "cqv": "十字弓彈",
   "crack": "破裂",
@@ -6858,6 +6885,7 @@ export const CANONICAL_CHI_TBL_DICT: Readonly<Record<string, string>> = {
   "of the Vampire": "吸血鬼的",
   "of the Wolf": "狼的",
   "of the Wraith": "死靈",
+  "ok": "好",
   "opl": "猛爆性葯劑",
   "opm": "爆炸葯劑",
   "ops": "油",
@@ -7169,7 +7197,10 @@ export const CANONICAL_CHI_TBL_DICT: Readonly<Record<string, string>> = {
   "strBSArmor": "裝甲",
   "strBSMisc": "其他",
   "strBSWeapons": "武器",
+  "strBankGoldDeposit": "你打算存入多少數量的金幣？",
+  "strBankGoldWithdraw": "你打算提出多少數量的金幣？",
   "strClose": "關閉",
+  "strDropGoldHowMuch": "你想要丟下多少數量的金幣？",
   "strGoldInStash": "儲藏起來的金錢：",
   "strGoldLabel": "金幣",
   "strModAllResistances": "所有抗性 +%d",
@@ -7387,7 +7418,8 @@ export const CANONICAL_CHI_TBL_DICT: Readonly<Record<string, string>> = {
   "uniquestoneskin": "皮膚硬化",
   "uniquemultishot": "多重射擊",
   "UniqueAuraEnchanted": "靈氣加強",
-  "strethereal": "无形的 (无法修复)"
+  "strethereal": "无形的 (无法修复)",
+  "patchstring#95": "修復所有裝備：%d"
 }
 
 export const CANONICAL_ISC_DESC_TABLE: Readonly<Record<string, CanonicalIscDescEntry>> = {

src/common/items/inventory-model.ts

@@ -13,9 +13,10 @@ export const INV_COLS = 10
 export const INV_ROWS = 4
 
 /**
- * Authoritative Diablo II v1.13c Shared Stash Gold Cap (`D2Common.dll` max gold in stash = 2,500,000).
+ * Diablo II v1.13c stash gold cap (`D2Common.dll` ordinal #11060 returns 2,500,000).
+ * The character inventory has no fixed cap; see {@link getInventoryGoldLimit}.
  */
-export const PLAYER_GOLD_CAP = 2_500_000
+export const STASH_GOLD_CAP = 2_500_000
 
 /**
  * Authentic Diablo II 1.13c Inventory Gold Limit (`D2Common/src/Units/Units.cpp:3103`).

src/common/items/item-cost.ts

@@ -1,11 +1,33 @@
+/**
+ * LEGACY vendor pricing over the server-side `Item` model.
+ *
+ * The 1.13c ground-truth port is `./transaction-cost.ts`, which ports
+ * `computeTransactionCost113c` (#10107, body 0x6fd78e80) and
+ * `computeRepairAllCost113c` (#10071, 0x6fd7a210). New code must use it.
+ *
+ * This module came from a D2MOO (1.10) port. It stays because
+ * `vendor-service.ts` and the legacy simulation tests price `Item` objects,
+ * which carry rolled properties instead of a full/base stat list. The fake
+ * addresses and permissive fallbacks have been removed:
+ * - ItemsTxt fields are read from the canonical compiled tables.
+ * - Missing Npc / Books / skill / ItemStatCost records throw.
+ * - Gamble pricing delegates to the 1.13c port.
+ */
 import type { DropTables } from './drop-tables.ts'
 import { ItemFlag, ItemQuality, type Item, type ItemBase, type RolledItemProp } from './items.ts'
-import { getItemTypeCode } from './affix-generator.ts'
 import type { ItemTypeTable } from './item-types.ts'
-import { VendorNpcId, getTownNpcDescriptorByVendorId, type NpcRecord } from '../units/npc-table.ts'
+import type { RolledAutoMagic } from './automagic.ts'
+import { VendorNpcId, type NpcRecord } from '../units/npc-table.ts'
+import {
+  computeGambleBaseCost113c,
+  fogMulDiv113c,
+  getCanonicalTransactionCostTables,
+  isItemCodeOfType113c,
+  type ItemsTxtCostRecord,
+} from './transaction-cost.ts'
 
 /**
- * Canonical 1.13c transaction types (`D2C_TransactionTypes` in D2Common.dll).
+ * Canonical 1.13c transaction types (`D2C_TransactionTypes`).
  */
 export const enum TransactionType {
   BUY = 0,
@@ -14,15 +36,6 @@ export const enum TransactionType {
   REPAIR = 3,
 }
 
-/**
- * Normal difficulty fallback Max Buy caps by Act (Acts 1..5), Nightmare, and Hell.
- */
-export const DEFAULT_NORMAL_MAX_BUY_BY_ACT: readonly [number, number, number, number, number] = [
-  5000, 10000, 15000, 20000, 25000,
-] as const
-export const DEFAULT_NIGHTMARE_MAX_BUY = 30000
-export const DEFAULT_HELL_MAX_BUY = 35000
-
 export interface TransactionCostOptions {
   readonly item: Item
   readonly transactionType: TransactionType
@@ -30,78 +43,79 @@ export interface TransactionCostOptions {
   readonly cLvl?: number | undefined
   readonly vendorId?: VendorNpcId | undefined
   readonly npcKey?: string | undefined
+  /** Unused since the Npc.txt record is required; kept so existing callers compile. */
   readonly actIndex?: 0 | 1 | 2 | 3 | 4 | undefined
   readonly completedQuests?: ReadonlySet<number> | undefined
   readonly reducedPricesPercent?: number | undefined
   readonly tables: DropTables
 }
 
+/** `0x6fd760f0` caps stack sizes here. */
+const MAX_STACK_CAP = 511
+/** `0x6fd78e80` caps reduced prices here (no lower clamp). */
+const REDUCED_PRICES_CAP = 99
+/** Encode-2/3 param split. UNCONFIRMED; see `transaction-cost.ts`. */
+const SKILL_PARAM_SHIFT = 6
+const SKILL_PARAM_MASK = 0x3f
+
+/** ItemsTxt record of a base; throws if the code is unknown. */
+function txt(base: ItemBase): ItemsTxtCostRecord {
+  const rec = getCanonicalTransactionCostTables().items.get(base.id)
+  if (!rec) throw new Error(`item-cost: unknown ItemsTxt code '${base.id}'`)
+  return rec
+}
+
+function primaryTypeOf(base: ItemBase, itemTypes: ItemTypeTable): ReturnType<ItemTypeTable['byCode']['get']> {
+  const code = txt(base).type
+  const def = itemTypes.byCode.get(code)
+  if (!def) throw new Error(`item-cost: unknown ItemTypes code '${code}' for '${base.id}'`)
+  return def
+}
+
 /**
- * Checks whether an item base belongs to a class-specific ItemType (`ItemTypes.Class !== ''`, i.e., `nClass < 7`).
+ * Whether the primary ItemType is class-specific (`ItemTypes.Class` set, `nClass < 7`).
+ * 0x6fd798b0 reads the primary type only, with no equivalences.
  */
 export function isClassSpecificItemBase(base: ItemBase, itemTypes: ItemTypeTable): boolean {
-  const startType = getItemTypeCode(base).trim()
+  const def = primaryTypeOf(base, itemTypes)
-  const queue: string[] = [startType, ...(base.tags ?? [])]
+  return Boolean(def?.class && def.class.trim().length > 0)
-  const visited = new Set<string>()
+}
 
-  while (queue.length > 0) {
+/** Whether the primary ItemType has StaffMods (`nStaffMods != 7`), as 0x6fd75970 checks. */
-    const code = queue.shift()!.trim()
+export function hasStaffModsItemType(base: ItemBase, itemTypes: ItemTypeTable): boolean {
-    if (!code || visited.has(code.toLowerCase())) continue
+  const def = primaryTypeOf(base, itemTypes)
-    visited.add(code.toLowerCase())
+  return Boolean(def?.staffMods && def.staffMods.trim().length > 0)
+}
 
-    const def = itemTypes.byCode.get(code)
+/** Primary ItemType `Quiver` set (0x6fd74e60). */
-    if (!def) continue
+export function isQuiverItem(base: ItemBase): boolean {
-    if (def.class && def.class.trim().length > 0) {
+  const t = getCanonicalTransactionCostTables().itemTypes.get(txt(base).type)
-      return true
+  if (!t) throw new Error(`item-cost: unknown ItemTypes code '${txt(base).type}'`)
-    }
+  return t.quiver
-    if (def.equiv1) queue.push(def.equiv1)
+}
-    if (def.equiv2) queue.push(def.equiv2)
+
-  }
+/** `book` type, with equivalences (0x6fd74430). */
-  return false
+export function isBookItem(base: ItemBase): boolean {
+  return isItemCodeOfType113c(getCanonicalTransactionCostTables(), base.id, 'book')
+}
+
+function isEthereal(item: Item): boolean {
+  return Boolean(item.flags?.ethereal) || ((item.rawFlags ?? 0) & ItemFlag.ETHEREAL) !== 0
+}
+
+function maxStackOf(base: ItemBase): number {
+  const n = txt(base).maxStack
+  return n > MAX_STACK_CAP ? MAX_STACK_CAP : n
 }
 
 /**
- * Checks whether an item base can receive StaffMods (`ItemTypes.StaffMods !== ''`, i.e., `nStaffMods != 7`).
+ * LEGACY "needs repair" predicate used by the vendor UI. It is NOT
+ * `ITEMS_IsRepairable` (0x6fd77090). That function is
+ * `isItemRepairable113c` in `./transaction-cost.ts`, and it also returns true
+ * for undamaged items.
  */
-export function hasStaffModsItemType(base: ItemBase, itemTypes: ItemTypeTable): boolean {
-  const startType = getItemTypeCode(base).trim()
-  const queue: string[] = [startType, ...(base.tags ?? [])]
-  const visited = new Set<string>()
-
-  while (queue.length > 0) {
-    const code = queue.shift()!.trim()
-    if (!code || visited.has(code.toLowerCase())) continue
-    visited.add(code.toLowerCase())
-
-    const def = itemTypes.byCode.get(code)
-    if (!def) continue
-    if (def.staffMods && def.staffMods.trim().length > 0) {
-      return true
-    }
-    if (def.equiv1) queue.push(def.equiv1)
-    if (def.equiv2) queue.push(def.equiv2)
-  }
-  return false
-}
-
-export function isQuiverItem(base: ItemBase): boolean {
-  const t = (base.type ?? '').toLowerCase()
-  const c = base.id.toLowerCase()
-  return t === 'bowq' || t === 'xbowq' || c === 'aqv' || c === 'cqv'
-}
-
-export function isBookItem(base: ItemBase): boolean {
-  const t = (base.type ?? '').toLowerCase()
-  const c = base.id.toLowerCase()
-  return t === 'book' || c === 'tbk' || c === 'ibk'
-}
-
 export function isItemRepairable(item: Item): boolean {
-  const isEthereal =
+  if (isEthereal(item)) return false
-    Boolean(item.flags?.ethereal) ||
-    Boolean((item as any).ethereal) ||
-    ((item.rawFlags ?? 0) & ItemFlag.ETHEREAL) !== 0
-  if (isEthereal) return false
 
   if (isQuiverItem(item.base) || isBookItem(item.base)) return false
 
@@ -111,20 +125,21 @@ export function isItemRepairable(item: Item): boolean {
   )
   if (hasIndestructible) return false
 
-  const maxDur = item.maxDurability ?? Number((item.base as any).durability) ?? 0
+  const rec = txt(item.base)
+  const maxDur = item.maxDurability ?? (rec.noDurability ? 0 : rec.durability)
   const curDur = item.durability ?? maxDur
   if (maxDur > 0 && curDur < maxDur) {
     return true
   }
 
-  // Also repairable if stackable throwing weapon below maxStack
+  // A stackable throwing weapon below its max stack can be refilled.
-  if ((item.base as any).stackable && item.base.kind === 'weapon') {
+  if (rec.stackable && item.base.kind === 'weapon') {
-    const maxStack = item.base.maxStack || Number((item.base as any).maxstack) || 1
+    const maxStack = maxStackOf(item.base)
     const qty = item.quantity ?? item.stack ?? maxStack
     if (qty < maxStack) return true
   }
 
-  // Also repairable if it has partially depleted charged skills
+  // Charged skills that have been used can be recharged.
   if (item.rolledProps?.some(p => p.code.toLowerCase() === 'charged')) {
     return true
   }
@@ -133,8 +148,8 @@ export function isItemRepairable(item: Item): boolean {
 }
 
 /**
- * Implements `ITEMS_CalculateAdditionalCostsForItemSkill` (`0x6FD9CB50`)
+ * StaffMods pricing (`0x6fd75970`) for single-skill staffmods
- * for single-skill staffmods (`STAT_ITEM_SINGLESKILL`) on StaffMods-eligible item types.
+ * (`STAT_ITEM_SINGLESKILL`) on StaffMods item types.
  */
 export function calculateAdditionalCostsForItemSkill(
   item: Item,
@@ -156,15 +171,18 @@ export function calculateAdditionalCostsForItemSkill(
     return { sellCost, buyCost, repCost }
   }
 
+  const skillCosts = tables.skillCosts
+  if (!skillCosts) throw new Error('item-cost: DropTables.skillCosts is required for StaffMods pricing')
+
   let nSell = 0
   let nBuy = 0
   let nRep = 0
 
   for (const sm of staffMods) {
     const skillId = Number(sm.param)
-    const slvl = Math.max(1, Math.trunc(sm.value))
+    const slvl = Math.trunc(sm.value)
-    const skillRec = tables.skillCosts?.get(skillId)
+    const skillRec = skillCosts.get(skillId)
-    if (!skillRec) continue
+    if (!skillRec) throw new Error(`item-cost: no Skills.txt cost record for skill ${skillId}`)
 
     const factor = 2 * slvl - 1
     nSell += factor * (skillRec.costAdd + Math.trunc((sellCost * skillRec.costMult) / 1024))
@@ -172,18 +190,17 @@ export function calculateAdditionalCostsForItemSkill(
     nRep += factor * (skillRec.costAdd + Math.trunc((repCost * skillRec.costMult) / 1024))
   }
 
-  const effDiv = Math.max(1, divisor)
   return {
-    sellCost: sellCost + Math.trunc(nSell / effDiv),
+    sellCost: sellCost + Math.trunc(nSell / divisor),
-    buyCost: buyCost + Math.trunc(nBuy / effDiv),
+    buyCost: buyCost + Math.trunc(nBuy / divisor),
-    repCost: repCost + Math.trunc(nRep / effDiv),
+    repCost: repCost + Math.trunc(nRep / divisor),
   }
 }
 
 /**
- * Implements `ITEMS_CalculateAdditionalCostsForBonusStats` (`0x6FD9ACE0`).
+ * Bonus-stat pricing (`0x6fd78850`): applies `ItemStatCost.txt`
- * Iterates resolved bonus stats on the item and applies `ItemStatCost.txt`
+ * (`Encode`, `Add`, `Multiply`) or `Skills.txt` (`CostAdd`, `CostMult`) to each
- * (`Encode`, `Add`, `Multiply`, `Divide`) or `Skills.txt` (`CostAdd`, `CostMult`).
+ * rolled stat. `Divide` is not read by 1.13c.
  */
 export function calculateAdditionalCostsForBonusStats(
   item: Item,
@@ -195,15 +212,13 @@ export function calculateAdditionalCostsForBonusStats(
 ): { sellCost: number; buyCost: number; repCost: number } {
   const propertiesTable = tables.properties
   const statCostTable = tables.itemStatCost
-  if (!statCostTable) {
+  if (!statCostTable) throw new Error('item-cost: DropTables.itemStatCost is required for bonus-stat pricing')
-    return { sellCost, buyCost, repCost }
-  }
 
   let nSell = 0
   let nBuy = 0
   let nRep = 0
 
-  // Collect resolved stats from rolledProps (excluding staffMods 'skill' which are handled by calculateAdditionalCostsForItemSkill)
+  // Collect resolved stats. StaffMods 'skill' entries are priced by calculateAdditionalCostsForItemSkill.
   const staffModSet = new Set<RolledItemProp>(item.staffMods ?? [])
   const props = item.rolledProps ?? []
 
@@ -211,14 +226,12 @@ export function calculateAdditionalCostsForBonusStats(
     readonly statId: number
     readonly param: number
     readonly value: number
-    readonly propCode?: string
-    readonly min?: number
-    readonly max?: number
   }
 
   const entries: StatBonusEntry[] = []
 
-  if (props.length > 0 && propertiesTable) {
+  if (props.length > 0) {
+    if (!propertiesTable) throw new Error('item-cost: DropTables.properties is required to resolve rolled properties')
     for (const prop of props) {
       if (staffModSet.has(prop)) continue
       if (prop.code.toLowerCase() === 'skill' && hasStaffModsItemType(item.base, tables.itemTypes)) {
@@ -237,33 +250,27 @@ export function calculateAdditionalCostsForBonusStats(
         prop.value,
         statCostTable,
       )
-      if (resolved.length > 0) {
       for (const r of resolved) {
-          entries.push({
+        entries.push({ statId: r.statId, param: r.param ?? numParam, value: r.value })
-            statId: r.statId,
-            param: r.param ?? numParam,
-            value: r.value,
-            propCode: prop.code,
-            min: prop.min,
-            max: prop.max,
-          })
-        }
       }
     }
   } else if (item.statList && item.statList.length > 0) {
     for (const s of item.statList) {
-      entries.push({
+      entries.push({ statId: s.statId, param: s.param ?? 0, value: s.value })
-        statId: s.statId,
-        param: s.param ?? 0,
-        value: s.value,
-      })
     }
   }
 
+  const skillCosts = tables.skillCosts
+  const requireSkill = (id: number): { costAdd: number; costMult: number } => {
+    const rec = skillCosts?.get(id)
+    if (!rec) throw new Error(`item-cost: no Skills.txt cost record for skill ${id}`)
+    return rec
+  }
+
   for (const entry of entries) {
     const statRec = statCostTable.getById(entry.statId)
-    if (!statRec) continue
+    if (!statRec) throw new Error(`item-cost: no ItemStatCost record for stat ${entry.statId}`)
-    // STAT_ITEM_SINGLESKILL (107) on staffMod items is priced by calculateAdditionalCostsForItemSkill
+    // STAT_ITEM_SINGLESKILL (107) on StaffMods items is priced by calculateAdditionalCostsForItemSkill.
     if (statRec.id === 107 && hasStaffModsItemType(item.base, tables.itemTypes)) {
       continue
     }
@@ -272,47 +279,45 @@ export function calculateAdditionalCostsForBonusStats(
 
     switch (statRec.encode) {
       case 1: {
-        const skillRec = tables.skillCosts?.get(entry.param)
+        const skillRec = requireSkill(entry.param)
-        if (skillRec) {
         nSell += skillRec.costAdd + Math.trunc((nBonusValue * sellCost * skillRec.costMult) / 1024)
         nBuy += skillRec.costAdd + Math.trunc((nBonusValue * buyCost * skillRec.costMult) / 4096)
         nRep += skillRec.costAdd + Math.trunc((nBonusValue * repCost * skillRec.costMult) / 1024)
-        }
         break
       }
       case 2:
       case 3: {
-        const skillId = entry.param > 63 ? entry.param >> 6 : entry.param
+        const skillRec = requireSkill(entry.param >> SKILL_PARAM_SHIFT)
-        const slvl = entry.param > 63 ? Math.max(1, entry.param & 0x3f) : Math.max(1, entry.max ?? 1)
+        const slvl = entry.param & SKILL_PARAM_MASK
-        const skillRec = tables.skillCosts?.get(skillId)
-        if (skillRec) {
         nSell += skillRec.costAdd + Math.trunc((slvl * sellCost * skillRec.costMult) / 1024)
         nBuy += skillRec.costAdd + Math.trunc((slvl * buyCost * skillRec.costMult) / 4096)
         nRep += skillRec.costAdd + Math.trunc((slvl * repCost * skillRec.costMult) / 1024)
-        }
         break
       }
       default: {
-        if (statRec.multiply > 0 || statRec.add > 0) {
         nSell += statRec.add + Math.trunc((nBonusValue * sellCost * statRec.multiply) / 1024)
         nBuy += statRec.add + Math.trunc((nBonusValue * buyCost * statRec.multiply) / 1024)
         nRep += statRec.add + Math.trunc((nBonusValue * repCost * statRec.multiply) / 1024)
-        }
         break
       }
     }
   }
 
-  const effDiv = Math.max(1, divisor)
   return {
-    sellCost: sellCost + Math.trunc(nSell / effDiv),
+    sellCost: sellCost + Math.trunc(nSell / divisor),
-    buyCost: buyCost + Math.trunc(nBuy / effDiv),
+    buyCost: buyCost + Math.trunc(nBuy / divisor),
-    repCost: repCost + Math.trunc(nRep / effDiv),
+    repCost: repCost + Math.trunc(nRep / divisor),
   }
 }
 
+function capReducedPrices(pct: number): number {
+  const v = Math.trunc(pct)
+  return v >= REDUCED_PRICES_CAP ? REDUCED_PRICES_CAP : v
+}
+
 /**
- * Calculates the 1.13c Gamble purchase price for an item (`ITEMS_CalculateTransactionCost` branch `TRANSACTIONTYPE_GAMBLE` at `0x6FD9B1C0`).
+ * Gamble price (`0x6fd78f38` → `0x6fd74840`), delegated to the 1.13c port.
+ * There is no minimum clamp: the asm returns this value directly.
  */
 export function calculateGambleCost(options: {
   readonly item: Item
@@ -320,87 +325,35 @@ export function calculateGambleCost(options: {
   readonly reducedPricesPercent?: number | undefined
   readonly tables: DropTables
 }): number {
-  const { item, cLvl, reducedPricesPercent = 0, tables } = options
+  const { item, cLvl, reducedPricesPercent = 0 } = options
-  const normCode = item.base.normcode || item.base.id
+  let cost = computeGambleBaseCost113c(item.base.id, Math.trunc(cLvl), getCanonicalTransactionCostTables())
-  const normBase = tables.getBase(normCode) ?? item.base
+  const rp = capReducedPrices(reducedPricesPercent)
-  const codeLower = normBase.id.toLowerCase()
+  if (rp !== 0) cost = (cost - fogMulDiv113c(rp, cost, 100)) | 0
+  return cost
+}
 
-  let nCost = 0
+/** Row index of the rolled AutoMagic affix. drop-tables.ts spreads `rolledAutoMagic` onto the item without a typed field. */
-  if (codeLower === 'rin' || codeLower === 'amu') {
+function rolledAutoMagicRow(item: Item): number | undefined {
-    nCost = normBase.gambleCost ?? (codeLower === 'rin' ? 50000 : 63000)
+  if (!('rolledAutoMagic' in item)) return undefined
-  } else {
+  const rolled: unknown = item.rolledAutoMagic
-    const minStack = Number((normBase as any).minstack) || 0
+  if (rolled === undefined) return undefined
-    const maxStack = Number((normBase as any).maxstack) || 0
+  const parsed = rolled as Partial<RolledAutoMagic>
-    const v27 = Math.max(1, Math.trunc((minStack + maxStack) / 2))
+  if (!parsed.entry || typeof parsed.entry.id !== 'number') throw new Error('item-cost: malformed rolledAutoMagic')
+  return parsed.entry.id
+}
 
-    let v23 = 0
+function resolveNpcRecord(tables: DropTables, vendorId?: VendorNpcId, npcKey?: string): NpcRecord {
-    let nUberCost = 0
+  if (!tables.npcTable) throw new Error('item-cost: DropTables.npcTable is required')
-    if (normBase.ubercode && normBase.ubercode !== '0' && normBase.ubercode !== 'xxx') {
+  const rec =
-      const uberBase = tables.getBase(normBase.ubercode)
+    (npcKey ? tables.npcTable.get(npcKey) : undefined) ??
-      if (uberBase) {
+    (vendorId !== undefined ? tables.npcTable.getByVendorId(vendorId) : undefined)
-        const v30 = 100 * (cLvl - uberBase.level)
+  if (!rec) throw new Error(`item-cost: no Npc.txt record for npcKey=${npcKey ?? '-'} vendorId=${vendorId ?? '-'}`)
-        v23 = Math.max(0, Math.trunc(v30 / 2) + 1)
+  return rec
-        nUberCost = uberBase.cost ?? uberBase.value
-      }
-    }
-
-    let v22 = 0
-    let nUltraCost = 0
-    if (normBase.ultracode && normBase.ultracode !== '0' && normBase.ultracode !== 'xxx') {
-      const ultraBase = tables.getBase(normBase.ultracode)
-      if (ultraBase) {
-        const v30 = 100 * (cLvl - ultraBase.level)
-        v22 = Math.max(0, Math.trunc(v30 / 4) + 1)
-        nUltraCost = ultraBase.cost ?? ultraBase.value
-      }
-    }
-
-    const normCost = normBase.cost ?? normBase.value
-    const nBase =
-      v23 * nUberCost +
-      v22 * nUltraCost +
-      v27 * normCost * (10000 - v22 - v23)
-
-    const effLvl = Math.max(5, Math.trunc(cLvl))
-    const baseQlvl = normBase.level
-    const lvlExcess = baseQlvl - 45 > 0 ? baseQlvl - 45 : 0
-
-    const factorA = Math.trunc((2 * effLvl + 1) / 3) + 20
-    const factorB =
-      Math.trunc(nBase / 10000) +
-      Math.trunc((250 * (effLvl + lvlExcess - Math.trunc(baseQlvl / 2))) / 3)
-
-    nCost = Math.trunc((factorA * factorB) / 15)
-  }
-
-  const clampedReduce = Math.min(99, Math.max(0, Math.trunc(reducedPricesPercent)))
-  if (clampedReduce > 0) {
-    nCost -= Math.trunc((nCost * clampedReduce) / 100)
-  }
-
-  return Math.max(1, nCost)
 }
 
 /**
- * Resolves the NpcRecord for a vendor / town NPC.
+ * LEGACY transaction pricing over `Item` (structured after 0x6fd78e80).
- */
+ * Prefer `computeTransactionCost113c`.
-function resolveNpcRecord(
-  tables: DropTables,
-  vendorId?: VendorNpcId,
-  npcKey?: string,
-): NpcRecord | undefined {
-  if (npcKey && tables.npcTable) {
-    const byKey = tables.npcTable.get(npcKey)
-    if (byKey) return byKey
-  }
-  if (vendorId !== undefined && tables.npcTable) {
-    return tables.npcTable.getByVendorId(vendorId)
-  }
-  return undefined
-}
-
-/**
- * Full 1.13c item transaction & acquisition pricing engine (`ITEMS_CalculateTransactionCost` at `0x6FD9B1C0`).
  */
 export function calculateTransactionCost(options: TransactionCostOptions): number {
   const {
@@ -410,7 +363,6 @@ export function calculateTransactionCost(options: TransactionCostOptions): numbe
     cLvl = 1,
     vendorId,
     npcKey,
-    actIndex,
     completedQuests,
     reducedPricesPercent = 0,
     tables,
@@ -428,17 +380,13 @@ export function calculateTransactionCost(options: TransactionCostOptions): numbe
   }
 
   if (transactionType === TransactionType.GAMBLE) {
-    return calculateGambleCost({
+    return calculateGambleCost({ item, cLvl, reducedPricesPercent, tables })
-      item,
-      cLvl,
-      reducedPricesPercent,
-      tables,
-    })
   }
 
+  const rec = txt(item.base)
   const nQuantity = Math.max(1, Math.trunc(item.quantity ?? item.stack ?? 1))
-  const clampedReduce = Math.min(99, Math.max(0, Math.trunc(reducedPricesPercent)))
+  const rp = capReducedPrices(reducedPricesPercent)
-  const baseCost = item.base.cost ?? item.base.value ?? 1
+  const baseCost = rec.cost
 
   let nSellCost = 0
   let nBuyCost = 0
@@ -450,20 +398,20 @@ export function calculateTransactionCost(options: TransactionCostOptions): numbe
     ((item.rawFlags ?? 0) & ItemFlag.IS_EAR) !== 0
 
   if (isEar) {
-    const earLvl = item.earData?.level ?? 1
+    const earLvl = item.earData?.level
+    if (earLvl === undefined) throw new Error('item-cost: ear item has no earData.level')
     nSellCost = baseCost * earLvl
     nBuyCost = nSellCost
   } else if (isBookItem(item.base)) {
     const bookRec = tables.booksTable?.getByBookCode(item.base.id)
-    const costPerCharge = bookRec?.costPerCharge ?? 80
+    if (!bookRec) throw new Error(`item-cost: no Books.txt record for '${item.base.id}'`)
-    nSellCost = baseCost + nQuantity * costPerCharge
+    nSellCost = baseCost + nQuantity * bookRec.costPerCharge
     nBuyCost = nSellCost
   } else if (isQuiverItem(item.base)) {
     nSellCost = Math.trunc((nQuantity * baseCost) / 1024)
     nBuyCost = nSellCost
-    const maxStack = Math.min(511, item.base.maxStack || 350)
+    nRepCost = Math.trunc((maxStackOf(item.base) * baseCost) / 1024)
-    nRepCost = Math.trunc((maxStack * baseCost) / 1024)
+  } else if (!rec.stackable) {
-  } else if (!(item.base as any).stackable) {
     nSellCost = baseCost
     nBuyCost = nSellCost
     nRepCost = nSellCost
@@ -471,18 +419,19 @@ export function calculateTransactionCost(options: TransactionCostOptions): numbe
     nSellCost = baseCost
     nBuyCost = nSellCost
     nRepCost = nSellCost
-    const maxStack = item.base.maxStack || Number((item.base as any).maxstack) || 1
+    const maxStack = maxStackOf(item.base)
-    nDivisor = Math.max(1, Math.min(511, maxStack))
+    nDivisor = maxStack > 1 ? maxStack : 1
   }
 
-  // Armor defense scaling (lines 2119-2131 of Items.cpp)
+  // 0x6fd7900b: armor scales by base defense over max defense
-  if (item.base.kind === 'armor') {
+  if (isItemCodeOfType113c(getCanonicalTransactionCostTables(), item.base.id, 'armo')) {
-    const minAc = Number((item.base as any).minac) || 0
+    const minAc = rec.minAc
-    const maxAc = Number((item.base as any).maxac) || item.base.defense || 0
+    const maxAc = rec.maxAc
-    if (maxAc > 0 && maxAc - minAc !== -1) {
+    if (maxAc !== 0 && maxAc - minAc !== -1) {
-      // Base unit STAT_ARMORCLASS (before ac% bonus stat)
+      // The Item model stores the final defense; strip ac% to recover the base roll.
+      const rawDef = item.defense ?? item.stats?.defense
+      if (rawDef === undefined) throw new Error(`item-cost: armor '${item.base.id}' has no defense value`)
       const acPct = item.stats?.['ac%'] ?? 0
-      const rawDef = item.defense ?? item.stats?.defense ?? maxAc
       const baseAc =
         acPct > 0
           ? Math.min(maxAc + 1, Math.max(minAc, Math.round((rawDef * 100) / (100 + acPct))))
@@ -495,16 +444,9 @@ export function calculateTransactionCost(options: TransactionCostOptions): numbe
 
   const quality = item.quality ?? ItemQuality.NORMAL
 
-  // StaffMods for Normal / Low / Superior items (lines 2135-2138)
+  // StaffMods before affixes for non-magic qualities
   if (quality < ItemQuality.MAGIC || quality > ItemQuality.TEMPERED) {
-    const afterSkill = calculateAdditionalCostsForItemSkill(
+    const afterSkill = calculateAdditionalCostsForItemSkill(item, nSellCost, nBuyCost, nRepCost, nDivisor, tables)
-      item,
-      nSellCost,
-      nBuyCost,
-      nRepCost,
-      nDivisor,
-      tables,
-    )
     nSellCost = afterSkill.sellCost
     nBuyCost = afterSkill.buyCost
     nRepCost = afterSkill.repCost
@@ -517,16 +459,25 @@ export function calculateTransactionCost(options: TransactionCostOptions): numbe
     let nSell = 0
     let nBuy = 0
     let nRep = 0
-
+    const addTerm = (add: number, mult: number): void => {
-    // AutoMagic affix cost (lines 2142-2157)
-    const autoAffix = (item as any).rolledAutoMagic?.entry
-    if (autoAffix && (autoAffix.add || autoAffix.multiply)) {
-      const add = autoAffix.add ?? 0
-      const mult = autoAffix.multiply ?? 0
       nSell += add + Math.trunc((nSellCost * mult) / 1024)
       nBuy += add + Math.trunc((nBuyCost * mult) / 1024)
       nRep += add + Math.trunc((nRepCost * mult) / 1024)
     }
+    const applyBonus = (): void => {
+      const afterBonus = calculateAdditionalCostsForBonusStats(item, nSellCost, nBuyCost, nRepCost, nDivisor, tables)
+      nSellCost = afterBonus.sellCost
+      nBuyCost = afterBonus.buyCost
+      nRepCost = afterBonus.repCost
+    }
+
+    // AutoMagic affix cost
+    const autoRow = rolledAutoMagicRow(item)
+    if (autoRow !== undefined) {
+      const auto = getCanonicalTransactionCostTables().autoMagic[autoRow]
+      if (!auto) throw new Error(`item-cost: AutoMagic row ${autoRow} outside table`)
+      addTerm(auto.add, auto.multiply)
+    }
 
     switch (quality) {
       case ItemQuality.RARE:
@@ -534,25 +485,9 @@ export function calculateTransactionCost(options: TransactionCostOptions): numbe
         const rareAffixes = item.rolledRareAffixes?.affixes ?? []
         for (const entry of rareAffixes) {
           const affix = entry.affix ?? entry
-          const add = Number(affix?.add) || 0
+          addTerm(Number(affix?.add) || 0, Number(affix?.multiply) || 0)
-          const mult = Number(affix?.multiply) || 0
-          if (add || mult) {
-            nSell += add + Math.trunc((nSellCost * mult) / 1024)
-            nBuy += add + Math.trunc((nBuyCost * mult) / 1024)
-            nRep += add + Math.trunc((nRepCost * mult) / 1024)
         }
-        }
+        applyBonus()
-        const afterBonus = calculateAdditionalCostsForBonusStats(
-          item,
-          nSellCost,
-          nBuyCost,
-          nRepCost,
-          nDivisor,
-          tables,
-        )
-        nSellCost = afterBonus.sellCost
-        nBuyCost = afterBonus.buyCost
-        nRepCost = afterBonus.repCost
         break
       }
 
@@ -561,23 +496,9 @@ export function calculateTransactionCost(options: TransactionCostOptions): numbe
           item.uniqueItemDef ??
           tables.uniques.byCode.get(item.base.id)?.find(u => u.index === item.name)
         if (uDef) {
-          const costAdd = Number(uDef.costAdd ?? (uDef as any).costadd) || 0
+          addTerm(Number(uDef.costAdd) || 0, Number(uDef.costMult) || 0)
-          const costMult = Number(uDef.costMult ?? (uDef as any).costmult) || 0
-          nSell += costAdd + Math.trunc((nSellCost * costMult) / 1024)
-          nBuy += costAdd + Math.trunc((nBuyCost * costMult) / 1024)
-          nRep += costAdd + Math.trunc((nRepCost * costMult) / 1024)
         } else {
-          const afterBonus = calculateAdditionalCostsForBonusStats(
+          applyBonus()
-            item,
-            nSellCost,
-            nBuyCost,
-            nRepCost,
-            nDivisor,
-            tables,
-          )
-          nSellCost = afterBonus.sellCost
-          nBuyCost = afterBonus.buyCost
-          nRepCost = afterBonus.repCost
         }
         break
       }
@@ -588,62 +509,23 @@ export function calculateTransactionCost(options: TransactionCostOptions): numbe
           tables.sets.items.entries.find(
             s => s.item.toLowerCase() === item.base.id.toLowerCase() && s.index === item.name,
           )
-        if (sDef) {
+        if (sDef) addTerm(Number(sDef.costAdd) || 0, Number(sDef.costMult) || 0)
-          const costAdd = Number(sDef.costAdd ?? (sDef as any).costadd) || 0
-          const costMult = Number(sDef.costMult ?? (sDef as any).costmult) || 0
-          nSell += costAdd + Math.trunc((nSellCost * costMult) / 1024)
-          nBuy += costAdd + Math.trunc((nBuyCost * costMult) / 1024)
-          nRep += costAdd + Math.trunc((nRepCost * costMult) / 1024)
-        }
         break
       }
 
       case ItemQuality.MAGIC: {
         const pAffix = item.rolledMagicAffixes?.prefix?.affix
-        if (pAffix) {
+        if (pAffix) addTerm(Number(pAffix.add) || 0, Number(pAffix.multiply) || 0)
-          const add = Number(pAffix.add) || 0
-          const mult = Number(pAffix.multiply) || 0
-          nSell += add + Math.trunc((nSellCost * mult) / 1024)
-          nBuy += add + Math.trunc((nBuyCost * mult) / 1024)
-          nRep += add + Math.trunc((nRepCost * mult) / 1024)
-        }
         const sAffix = item.rolledMagicAffixes?.suffix?.affix
-        if (sAffix) {
+        if (sAffix) addTerm(Number(sAffix.add) || 0, Number(sAffix.multiply) || 0)
-          const add = Number(sAffix.add) || 0
+        applyBonus()
-          const mult = Number(sAffix.multiply) || 0
-          nSell += add + Math.trunc((nSellCost * mult) / 1024)
-          nBuy += add + Math.trunc((nBuyCost * mult) / 1024)
-          nRep += add + Math.trunc((nRepCost * mult) / 1024)
-        }
-        const afterBonus = calculateAdditionalCostsForBonusStats(
-          item,
-          nSellCost,
-          nBuyCost,
-          nRepCost,
-          nDivisor,
-          tables,
-        )
-        nSellCost = afterBonus.sellCost
-        nBuyCost = afterBonus.buyCost
-        nRepCost = afterBonus.repCost
         break
       }
 
       case ItemQuality.SUPERIOR:
-      case ItemQuality.TEMPERED: {
+      case ItemQuality.TEMPERED:
-        const afterBonus = calculateAdditionalCostsForBonusStats(
+        applyBonus()
-          item,
-          nSellCost,
-          nBuyCost,
-          nRepCost,
-          nDivisor,
-          tables,
-        )
-        nSellCost = afterBonus.sellCost
-        nBuyCost = afterBonus.buyCost
-        nRepCost = afterBonus.repCost
         break
-      }
 
       case ItemQuality.LOW: {
         nSell = -Math.trunc(nSellCost / 2)
@@ -661,74 +543,52 @@ export function calculateTransactionCost(options: TransactionCostOptions): numbe
     nRepCost += Math.trunc(nRep / nDivisor)
 
     if (quality >= ItemQuality.MAGIC && quality <= ItemQuality.TEMPERED) {
-      const afterSkill = calculateAdditionalCostsForItemSkill(
+      const afterSkill = calculateAdditionalCostsForItemSkill(item, nSellCost, nBuyCost, nRepCost, nDivisor, tables)
-        item,
-        nSellCost,
-        nBuyCost,
-        nRepCost,
-        nDivisor,
-        tables,
-      )
       nSellCost = afterSkill.sellCost
       nBuyCost = afterSkill.buyCost
       nRepCost = afterSkill.repCost
     }
   }
 
-  // Socketed items (lines 2311-2325 of Items.cpp)
+  // 0x6fd74a50: socketed children add half their ItemsTxt cost
-  if (item.socketedItems && item.socketedItems.length > 0) {
+  for (const socketable of item.socketedItems ?? []) {
-    for (const socketable of item.socketedItems) {
+    const socketableCost = Math.trunc(txt(socketable.base).cost / 2)
-      const socketableCost = Math.trunc((socketable.base.cost ?? socketable.base.value ?? 0) / 2)
     nSellCost += socketableCost
     nBuyCost += socketableCost
     nRepCost += socketableCost
   }
-  }
 
-  // Ethereal acquisition quartering (lines 2327-2330)
+  // 0x6fd798b0: ethereal and class-specific quartering of the player-sell price
-  const isEthereal =
+  const ethereal = isEthereal(item)
-    Boolean(item.flags?.ethereal) ||
+  if (ethereal) {
-    Boolean((item as any).ethereal) ||
-    ((item.rawFlags ?? 0) & ItemFlag.ETHEREAL) !== 0
-  if (isEthereal) {
     nBuyCost = Math.trunc(nBuyCost / 4)
   }
-
-  // Class-specific item acquisition quartering (lines 2332-2340)
   if (isClassSpecificItemBase(item.base, tables.itemTypes)) {
     nBuyCost = Math.trunc(nBuyCost / 4)
   }
 
-  const maxDura = item.maxDurability ?? Number((item.base as any).durability) ?? 0
+  const maxDura = item.maxDurability ?? (rec.noDurability ? 0 : rec.durability)
   const curDura = item.durability ?? maxDura
 
   if (transactionType === TransactionType.SELL) {
-    if (isEthereal && maxDura > 0 && curDura <= 0) {
+    if (ethereal && maxDura > 0 && curDura <= 0) {
       nBuyCost = 0
     }
   } else if (transactionType === TransactionType.REPAIR) {
     if (maxDura > 0) {
-      if (curDura < maxDura) {
+      nRepCost = curDura < maxDura ? Math.trunc((nRepCost * (maxDura - curDura)) / maxDura) : 0
-        nRepCost = Math.trunc((nRepCost * (maxDura - curDura)) / maxDura)
-      } else {
-        nRepCost = 0
-      }
     }
   }
 
-  // Apply Npc.txt multipliers and quest discounts (lines 2388-2450)
+  // 0x6fd799d8 / 0x6fd79aa0: Npc.txt multipliers and quest discounts
   const npcRec = resolveNpcRecord(tables, vendorId, npcKey)
-  const sellMult = npcRec?.sellMult ?? 1024
+  nSellCost = Math.trunc((nSellCost * npcRec.sellMult) / 1024)
-  const buyMult = npcRec?.buyMult ?? 512
+  nBuyCost = Math.trunc((nBuyCost * npcRec.buyMult) / 1024)
-  const repMult = npcRec?.repMult ?? 1024
+  nRepCost = Math.trunc((nRepCost * npcRec.repMult) / 1024)
 
-  nSellCost = Math.trunc((nSellCost * sellMult) / 1024)
+  if (completedQuests && completedQuests.size > 0) {
-  nBuyCost = Math.trunc((nBuyCost * buyMult) / 1024)
-  nRepCost = Math.trunc((nRepCost * repMult) / 1024)
-
-  if (npcRec && completedQuests && completedQuests.size > 0) {
     for (let i = 0; i < 3; i++) {
-      const qFlag = npcRec.questFlag[i] ?? 0
+      const qFlag = npcRec.questFlag[i]!
       if (qFlag > 0 && completedQuests.has(qFlag)) {
         nSellCost = Math.trunc((nSellCost * npcRec.questSellMult[i]!) / 1024)
         nBuyCost = Math.trunc((nBuyCost * npcRec.questBuyMult[i]!) / 1024)
@@ -737,51 +597,27 @@ export function calculateTransactionCost(options: TransactionCostOptions): numbe
     }
   }
 
-  // Quantity multiplication for non-book, non-quiver items (lines 2452-2483)
+  // 0x6fd79b8d: quantity for non-book, non-quiver items
   if (!isBookItem(item.base) && !isQuiverItem(item.base)) {
     nSellCost *= nQuantity
-    if ((item.base as any).stackable && isItemRepairable(item)) {
+    if (rec.stackable && isItemRepairable(item)) {
-      const maxStack = Math.min(511, item.base.maxStack || Number((item.base as any).maxstack) || 1)
+      const maxStack = maxStackOf(item.base)
-      if (nQuantity < maxStack) {
+      nRepCost = nQuantity < maxStack ? nRepCost * (maxStack - nQuantity) : 0
-        nRepCost *= maxStack - nQuantity
-      } else {
-        nRepCost = 0
     }
     nBuyCost *= nQuantity
-    } else {
-      nBuyCost *= nQuantity
-    }
   }
 
   if (transactionType === TransactionType.SELL) {
-    let nCost = nBuyCost
+    const cap = npcRec.maxBuy[difficulty]
-    let maxBuyCap: number
+    const nCost = nBuyCost > cap ? cap : nBuyCost
-    if (npcRec) {
-      maxBuyCap = npcRec.maxBuy[difficulty] ?? 35000
-    } else if (difficulty === 0) {
-      const resolvedAct =
-        actIndex ??
-        (vendorId !== undefined ? getTownNpcDescriptorByVendorId(vendorId)?.actIndex : undefined) ??
-        0
-      maxBuyCap = DEFAULT_NORMAL_MAX_BUY_BY_ACT[resolvedAct] ?? 5000
-    } else if (difficulty === 1) {
-      maxBuyCap = DEFAULT_NIGHTMARE_MAX_BUY
-    } else {
-      maxBuyCap = DEFAULT_HELL_MAX_BUY
-    }
-
-    if (nCost > maxBuyCap) {
-      nCost = maxBuyCap
-    }
     return Math.max(1, nCost)
   }
 
   if (transactionType === TransactionType.REPAIR) {
-    let nCost = nRepCost - Math.trunc((nRepCost * clampedReduce) / 100)
+    const nCost = rp !== 0 ? nRepCost - fogMulDiv113c(rp, nRepCost, 100) : nRepCost
     return Math.max(1, nCost)
   }
 
-  // TransactionType.BUY
+  const nCost = rp !== 0 ? nSellCost - fogMulDiv113c(rp, nSellCost, 100) : nSellCost
-  let nCost = nSellCost - Math.trunc((nSellCost * clampedReduce) / 100)
   return Math.max(1, nCost)
 }

src/netproto/d2gs/c2s/interact.ts

@@ -24,12 +24,41 @@ export function encodeC2sWaypointGo(waypointId: number, destAreaId: number): Uin
   return validateC2sPacket(w.toUint8Array())
 }
 
-/** 0x4F ClickButton (7B): u8 0x4F | u16 buttonId | u16 complementLow | u16 complementHigh */
+/**
-export function encodeC2sClickButton(buttonId: number, complement = 0): Uint8Array {
+ * 0x4F ClickButton button ids (1.13c). Sender call sites in D2Client.dll; dispatcher D2Game.dll 0x6fc94200.
+ * - 0x08 TradeGold: amount = gold offered in the trade window.
+ * - 0x12 CloseStash: amount 0.
+ * - 0x13 WithdrawGold: stash -> inventory, amount (D2Game 0x6fc917e0; rejected if gold + amount > clvl*10000).
+ * - 0x14 DepositGold: inventory -> stash, amount (D2Game 0x6fc917e0; clamped to the 2,500,000 bank cap).
+ * - 0x18 Transmute: Horadric Cube transmute, amount 0.
+ */
+export const ClickButtonId = {
+  TradeGold: 0x08,
+  CloseStash: 0x12,
+  WithdrawGold: 0x13,
+  DepositGold: 0x14,
+  Transmute: 0x18,
+} as const
+
+/**
+ * 0x4F ClickButton (7B): u8 0x4F | u16 buttonId | u16 amountHigh | u16 amountLow.
+ *
+ * D2Game.dll 0x6fcf1470 rebuilds the 32-bit amount as `(WORD[3] << 16) | WORD[5]`; D2Client's gold
+ * dialog OK handler (0x6fb6fdf0..0x6fb6fe79) passes the high word in dx and the low word on the stack.
+ * The high word therefore precedes the low word on the wire.
+ */
+export function encodeC2sClickButton(buttonId: number, amount: number): Uint8Array {
+  if (!Number.isInteger(buttonId) || buttonId < 0 || buttonId > 0xffff) {
+    throw new RangeError(`ClickButton: invalid buttonId ${buttonId}`)
+  }
+  if (!Number.isInteger(amount) || amount < 0 || amount > 0xffffffff) {
+    throw new RangeError(`ClickButton: invalid amount ${amount}`)
+  }
   const w = new ByteWriter(7)
   w.u8(0x4f)
-  w.u16LE(buttonId & 0xffff)
+  w.u16LE(buttonId)
-  w.u32LE(complement >>> 0)
+  w.u16LE((amount >>> 16) & 0xffff)
+  w.u16LE(amount & 0xffff)
   return validateC2sPacket(w.toUint8Array())
 }
 

src/netproto/d2gs/c2s/npc.ts

@@ -24,25 +24,69 @@ export function encodeC2sNpcCancel(target: UnitRef): Uint8Array {
   return validateC2sPacket(w.toUint8Array())
 }
 
-/** 0x32 BuyItem (17B): u8 0x32 | u32 npcId | u32 itemId | u32 tab | u32 cost */
+function requireU32(name: string, v: number): number {
-export function encodeC2sNpcBuy(npcId: number, itemId: number, tab: number, cost: number): Uint8Array {
+  if (!Number.isInteger(v) || v < 0 || v > 0xffffffff) throw new RangeError(`${name}: invalid u32 ${v}`)
+  return v >>> 0
+}
+
+function requireU16(name: string, v: number): number {
+  if (!Number.isInteger(v) || v < 0 || v > 0xffff) throw new RangeError(`${name}: invalid u16 ${v}`)
+  return v
+}
+
+/** 0x32 field3 bit: gamble purchase (D2Client global [0x6fbc97a8] set while the gamble window is open). */
+export const NPC_BUY_FLAG_GAMBLE = 0x00000002
+/** 0x32 field3 bit: shift+right-click fill buy (ItemsTxt +0x1a5 quantity-fill items; D2Client 0x6faf6ee0). */
+export const NPC_BUY_FLAG_SHIFT_FILL = 0x80000000
+
+export interface NpcBuyParams {
+  readonly npcId: number
+  readonly itemId: number
+  /** Shop item UnitAny.dwMode (u16) as seen by the client; packed into the high word of field3. */
+  readonly itemMode: number
+  readonly gamble: boolean
+  readonly shiftFill: boolean
+  /** Client-side cost (D2Common #10107 type 0/2); the server recomputes the price itself. */
+  readonly cost: number
+}
+
+/**
+ * 0x32 BuyItem (17B): u8 0x32 | u32 npcId | u32 itemId | u32 field3 | u32 cost.
+ * field3 = (itemMode << 16) | (gamble ? 2 : 0) | (shiftFill ? 0x80000000 : 0) (D2Client 0x6faf6ee0;
+ * D2Game 0x6fcef220 splits `&0x80000000`, `&0x7fffffff`, `>>16` before calling 0x6fcdf200).
+ */
+export function encodeC2sNpcBuy(p: NpcBuyParams): Uint8Array {
+  const field3 =
+    ((requireU16('NpcBuy.itemMode', p.itemMode) << 16) |
+      (p.gamble ? NPC_BUY_FLAG_GAMBLE : 0) |
+      (p.shiftFill ? NPC_BUY_FLAG_SHIFT_FILL : 0)) >>>
+    0
   const w = new ByteWriter(17)
   w.u8(0x32)
-  w.u32LE(npcId >>> 0)
+  w.u32LE(requireU32('NpcBuy.npcId', p.npcId))
-  w.u32LE(itemId >>> 0)
+  w.u32LE(requireU32('NpcBuy.itemId', p.itemId))
-  w.u32LE(tab >>> 0)
+  w.u32LE(field3)
-  w.u32LE(cost >>> 0)
+  w.u32LE(requireU32('NpcBuy.cost', p.cost))
   return validateC2sPacket(w.toUint8Array())
 }
 
-/** 0x33 SellItem (17B): u8 0x33 | u32 npcId | u32 itemId | u32 tab | u32 cost */
+export interface NpcSellParams {
-export function encodeC2sNpcSell(npcId: number, itemId: number, tab: number, cost: number): Uint8Array {
+  readonly npcId: number
+  readonly itemId: number
+  /** Sold item UnitAny.dwMode (u16); D2Game only reads WORD@9 of field3. */
+  readonly itemMode: number
+  /** Client-side sell price (D2Common #10107 type 1); the server recomputes the price itself. */
+  readonly cost: number
+}
+
+/** 0x33 SellItem (17B): u8 0x33 | u32 npcId | u32 itemId | u32 field3 (= itemMode) | u32 cost (D2Client 0x6fb46d5f). */
+export function encodeC2sNpcSell(p: NpcSellParams): Uint8Array {
   const w = new ByteWriter(17)
   w.u8(0x33)
-  w.u32LE(npcId >>> 0)
+  w.u32LE(requireU32('NpcSell.npcId', p.npcId))
-  w.u32LE(itemId >>> 0)
+  w.u32LE(requireU32('NpcSell.itemId', p.itemId))
-  w.u32LE(tab >>> 0)
+  w.u32LE(requireU16('NpcSell.itemMode', p.itemMode))
-  w.u32LE(cost >>> 0)
+  w.u32LE(requireU32('NpcSell.cost', p.cost))
   return validateC2sPacket(w.toUint8Array())
 }
 
@@ -54,19 +98,41 @@ export function encodeC2sNpcIdentifyAll(npcId: number): Uint8Array {
   return validateC2sPacket(w.toUint8Array())
 }
 
-/** 0x35 Repair (17B): u8 0x35 | u32 npcId | u32 itemId | u32 tab | u32 cost */
+/** 0x35 field4 sign bit: repair every equipped/inventory item (D2Game 0x6fcdde60, price D2Common #10071). */
-export function encodeC2sNpcRepair(
+export const NPC_REPAIR_ALL_FLAG = 0x80000000
-  npcId: number,
+
-  itemId = 0,
+export interface NpcRepairItemParams {
-  tab = 0,
+  readonly npcId: number
-  cost = 0x80000000,
+  readonly itemId: number
-): Uint8Array {
+  /** Item UnitAny.dwMode (u16). */
+  readonly itemMode: number
+  /** Current durability (item stat 72) as read by the client via D2Common #10973. */
+  readonly durability: number
+}
+
+/** 0x35 Repair single item (17B): u8 0x35 | u32 npcId | u32 itemId | u32 itemMode | u32 durability. */
+export function encodeC2sNpcRepairItem(p: NpcRepairItemParams): Uint8Array {
+  const durability = requireU32('NpcRepairItem.durability', p.durability)
+  if ((durability & NPC_REPAIR_ALL_FLAG) !== 0) {
+    throw new RangeError('NpcRepairItem: durability must not set the repair-all sign bit')
+  }
   const w = new ByteWriter(17)
   w.u8(0x35)
-  w.u32LE(npcId >>> 0)
+  w.u32LE(requireU32('NpcRepairItem.npcId', p.npcId))
-  w.u32LE(itemId >>> 0)
+  w.u32LE(requireU32('NpcRepairItem.itemId', p.itemId))
-  w.u32LE(tab >>> 0)
+  w.u32LE(requireU16('NpcRepairItem.itemMode', p.itemMode))
-  w.u32LE(cost >>> 0)
+  w.u32LE(durability)
+  return validateC2sPacket(w.toUint8Array())
+}
+
+/** 0x35 Repair all (17B): u8 0x35 | u32 npcId | u32 0 | u32 0 | u32 0x80000000 (D2Client 0x6faf7dff clears itemId). */
+export function encodeC2sNpcRepairAll(npcId: number): Uint8Array {
+  const w = new ByteWriter(17)
+  w.u8(0x35)
+  w.u32LE(requireU32('NpcRepairAll.npcId', npcId))
+  w.u32LE(0)
+  w.u32LE(0)
+  w.u32LE(NPC_REPAIR_ALL_FLAG)
   return validateC2sPacket(w.toUint8Array())
 }
 
@@ -79,13 +145,26 @@ export function encodeC2sHireMerc(npcId: number, mercId: number): Uint8Array {
   return validateC2sPacket(w.toUint8Array())
 }
 
-/** 0x38 EntityAction (13B): u8 0x38 | u32 actionType (1=trade, 2=gamble) | u32 npcId | u32 complement */
+/**
-export function encodeC2sNpcEntityAction(actionType: number, npcId: number, complement = 0): Uint8Array {
+ * 0x38 EntityAction action values handled by D2Game.dll 0x6fce00c0 (via C2S handler 0x6fcefb30):
+ * - 1 Trade: vendor classes -> 0x6fcdf810(gamble = 0) fills the shop.
+ * - 2 Gamble: classes 147/199/254/405/512/514 -> 0x6fcdf810(gamble = 1).
+ * - 3 Hire: 0x6fcdd330 (mercenary list).
+ * D2Client sends both trade (0x6fafb1e6) and gamble (0x6fafae85) with complement 0.
+ */
+export const NpcActionId = {
+  Trade: 1,
+  Gamble: 2,
+  Hire: 3,
+} as const
+
+/** 0x38 EntityAction (13B): u8 0x38 | u32 action | u32 npcId | u32 complement */
+export function encodeC2sNpcEntityAction(action: number, npcId: number, complement: number): Uint8Array {
   const w = new ByteWriter(13)
   w.u8(0x38)
-  w.u32LE(actionType >>> 0)
+  w.u32LE(requireU32('NpcEntityAction.action', action))
-  w.u32LE(npcId >>> 0)
+  w.u32LE(requireU32('NpcEntityAction.npcId', npcId))
-  w.u32LE(complement >>> 0)
+  w.u32LE(requireU32('NpcEntityAction.complement', complement))
   return validateC2sPacket(w.toUint8Array())
 }
 

src/netproto/d2gs/c2s/trade.ts

@@ -4,6 +4,7 @@
 
 import { encodeC2sClickButton } from './interact.ts'
 
-export function encodeC2sTrade(action: number, gold = 0): Uint8Array {
+/** Trade window buttons share 0x4F ClickButton; `gold` is only meaningful for button 0x08 (TradeGold). */
+export function encodeC2sTrade(action: number, gold: number): Uint8Array {
   return encodeC2sClickButton(action, gold)
 }

src/netproto/d2gs/registry.ts

@@ -40,7 +40,9 @@ import {
   encodeC2sNpcEntityAction,
   encodeC2sNpcIdentifyAll,
   encodeC2sNpcInit,
-  encodeC2sNpcRepair,
+  encodeC2sNpcRepairAll,
+  encodeC2sNpcRepairItem,
+  NpcActionId,
   encodeC2sNpcResurrectMerc,
   encodeC2sNpcSell,
 } from './c2s/npc.ts'
@@ -468,16 +470,20 @@ export function encodeD2gsClientCommand(
       return [encodeC2sNpcInit(cmd.target)]
     case 'NpcCancel':
       return [encodeC2sNpcCancel(cmd.target)]
+    case 'NpcOpenTrade':
+      return [encodeC2sNpcEntityAction(NpcActionId.Trade, cmd.npcId, 0)]
+    case 'NpcOpenGamble':
+      return [encodeC2sNpcEntityAction(NpcActionId.Gamble, cmd.npcId, 0)]
     case 'NpcBuy':
-      return [encodeC2sNpcBuy(cmd.npcId, cmd.itemId, cmd.tab, cmd.cost)]
+      return [encodeC2sNpcBuy(cmd)]
     case 'NpcSell':
-      return [encodeC2sNpcSell(cmd.npcId, cmd.itemId, cmd.tab, cmd.cost)]
+      return [encodeC2sNpcSell(cmd)]
-    case 'NpcRepair':
+    case 'NpcRepairItem':
-      return [encodeC2sNpcRepair(cmd.npcId, cmd.itemId, cmd.tab, cmd.cost)]
+      return [encodeC2sNpcRepairItem(cmd)]
+    case 'NpcRepairAll':
+      return [encodeC2sNpcRepairAll(cmd.npcId)]
     case 'NpcHeal':
       return [encodeC2sNpcInit({ unitType: 1, id: cmd.npcId })]
-    case 'NpcGamble':
-      return [encodeC2sNpcEntityAction(2, cmd.npcId, cmd.itemId ?? 0)]
     case 'NpcIdentifyAll':
       return [encodeC2sNpcIdentifyAll(cmd.npcId)]
     case 'NpcResurrectMerc':
@@ -493,7 +499,7 @@ export function encodeD2gsClientCommand(
     case 'TownPortal':
       return [encodeC2sSkillAt('right', { x: 0, y: 0 })]
     case 'ClickButton':
-      return [encodeC2sClickButton(cmd.buttonId, cmd.complement)]
+      return [encodeC2sClickButton(cmd.buttonId, cmd.amount)]
     case 'Party':
       return [encodeC2sParty(cmd.action, cmd.targetPlayerId)]
     case 'Hostile':

src/netproto/d2gs/s2c/npc.ts

@@ -24,22 +24,30 @@ export function decode0x27NpcInfo(pkt: Uint8Array): ServerEvent {
   }
 }
 
-/** 0x2A NPCTransaction (15B, D2Client.dll 0x6fb5f9b0) */
+/**
+ * 0x2A NPCTransaction (15B).
+ *
+ * Server builder D2Game.dll 0x6fcaac90(al=0x2A, cl=result, edx=gold; stack: client, itemId, flag):
+ *   [0]=0x2A [1]=flag [2]=result [3..6]=not written (stack garbage) [7..10]=u32 itemId [11..14]=u32 gold (stat 14).
+ * Client D2Client.dll 0x6fb5f9b0 -> 0x6fafbc80 copies the packet to 0x6fbc977f and only reads
+ * result ([0x6fbc9781]) and itemId ([0x6fbc9786]); flag and gold are not consumed by the client
+ * (inventory gold is driven by stat 14 updates).
+ */
 export function decode0x2ANpcTransaction(pkt: Uint8Array): ServerEvent {
+  if (pkt.length !== 15) throw new RangeError(`0x2A NPCTransaction: expected 15 bytes, got ${pkt.length}`)
   const r = new ByteReader(pkt)
   r.u8() // 0x2A
-  const tradeType = r.u8()
+  const flag = r.u8()
   const result = r.u8()
-  const npcId = r.u32LE()
+  r.skip(4) // [3..6] uninitialised on the server side
-  const merchandiseId = r.u32LE()
+  const itemId = r.u32LE()
-  const goldRemaining = r.u32LE()
+  const gold = r.u32LE()
   return {
-    type: 'Npc',
+    type: 'NpcTransaction',
-    kind: 'transaction',
+    result,
-    npcId,
+    flag,
-    result: (result << 8) | tradeType,
+    itemId,
-    merchandiseId,
+    gold,
-    goldRemaining,
   }
 }
 

src/netproto/domain/client-command.ts

@@ -50,29 +50,39 @@ export type ClientCommand =
   | { readonly type: 'IdentifyItem'; readonly itemId: number; readonly scrollId: number }
   | { readonly type: 'NpcInit'; readonly target: UnitRef }
   | { readonly type: 'NpcCancel'; readonly target: UnitRef }
+  /** 0x38 action 1: open the vendor trade window (server fills the shop with 0x9C AddToShop). */
+  | { readonly type: 'NpcOpenTrade'; readonly npcId: number }
+  /** 0x38 action 2: open the gamble window. */
+  | { readonly type: 'NpcOpenGamble'; readonly npcId: number }
   | {
+      /** 0x32 BuyItem; field3 = (itemMode << 16) | (gamble ? 2 : 0) | (shiftFill ? 0x80000000 : 0). */
       readonly type: 'NpcBuy'
       readonly npcId: number
       readonly itemId: number
-      readonly tab: number
+      readonly itemMode: number
+      readonly gamble: boolean
+      readonly shiftFill: boolean
       readonly cost: number
     }
   | {
+      /** 0x33 SellItem; field3 = itemMode. */
       readonly type: 'NpcSell'
       readonly npcId: number
       readonly itemId: number
-      readonly tab: number
+      readonly itemMode: number
       readonly cost: number
     }
   | {
-      readonly type: 'NpcRepair'
+      /** 0x35 Repair one item: field3 = itemMode, field4 = current durability (stat 72). */
+      readonly type: 'NpcRepairItem'
       readonly npcId: number
-      readonly itemId?: number | undefined
+      readonly itemId: number
-      readonly tab?: number | undefined
+      readonly itemMode: number
-      readonly cost?: number | undefined
+      readonly durability: number
     }
+  /** 0x35 Repair all: itemId 0, field3 0, field4 0x80000000. */
+  | { readonly type: 'NpcRepairAll'; readonly npcId: number }
   | { readonly type: 'NpcHeal'; readonly npcId: number }
-  | { readonly type: 'NpcGamble'; readonly npcId: number; readonly itemId?: number | undefined }
   | { readonly type: 'NpcIdentifyAll'; readonly npcId: number }
   | { readonly type: 'NpcResurrectMerc'; readonly npcId: number }
   | { readonly type: 'HireMerc'; readonly npcId: number; readonly mercId: number }
@@ -80,10 +90,11 @@ export type ClientCommand =
   | { readonly type: 'AddSkillPoint'; readonly skillId: number }
   | { readonly type: 'WaypointGo'; readonly waypointId: number; readonly destAreaId: number }
   | { readonly type: 'TownPortal' }
-  | { readonly type: 'ClickButton'; readonly buttonId: number; readonly complement?: number | undefined }
+  /** 0x4F ClickButton: see `ClickButtonId` (0x12 close stash, 0x13 withdraw, 0x14 deposit, 0x18 transmute). */
+  | { readonly type: 'ClickButton'; readonly buttonId: number; readonly amount: number }
   | { readonly type: 'Party'; readonly action: number; readonly targetPlayerId: number }
   | { readonly type: 'Hostile'; readonly targetPlayerId: number; readonly hostile: boolean }
-  | { readonly type: 'Trade'; readonly action: number; readonly gold?: number | undefined }
+  | { readonly type: 'Trade'; readonly action: number; readonly gold: number }
   | { readonly type: 'Chat'; readonly text: string; readonly whisperTo?: string | undefined }
   | { readonly type: 'OverheadChat'; readonly text: string }
   | { readonly type: 'Resurrect' }

src/netproto/domain/server-event.ts

@@ -141,13 +141,20 @@ export type ServerEvent =
     }
   | {
       readonly type: 'Npc'
-      readonly kind: 'info' | 'menu' | 'transaction' | 'heal'
+      readonly kind: 'info' | 'menu' | 'heal'
       readonly npcId: number
       readonly result?: number | undefined
-      readonly merchandiseId?: number | undefined
-      readonly goldRemaining?: number | undefined
       readonly raw?: Uint8Array | undefined
     }
+  | {
+      /** 0x2A NPCTransaction result (D2Game 0x6fcaac90). `itemId` 0xFFFFFFFF = none. */
+      readonly type: 'NpcTransaction'
+      readonly result: number
+      readonly flag: number
+      readonly itemId: number
+      /** Server's stat 14 at send time; informational only (the client uses stat 14 updates). */
+      readonly gold: number
+    }
   | {
       readonly type: 'WaypointMenu'
       readonly unitId: number

src/netproto/index.ts

@@ -113,6 +113,8 @@ export { decodeBncsS2cPacket } from './bncs/packets.ts'
 export { McpFramer } from './mcp/framing.ts'
 export { decodeMcpS2cPacket } from './mcp/packets.ts'
 export { validateC2sPacket } from './d2gs/framing-c2s.ts'
+export { ClickButtonId } from './d2gs/c2s/interact.ts'
+export { NpcActionId, NPC_BUY_FLAG_GAMBLE, NPC_BUY_FLAG_SHIFT_FILL, NPC_REPAIR_ALL_FLAG } from './d2gs/c2s/npc.ts'
 export { C2S_PACKET_SIZES } from './d2gs/tables/s2c-sizes.ts'
 export {
   D2GS_S2C_REGISTRY,

tests/challenger-m5-stash-entities-gold.test.ts

@@ -3,7 +3,6 @@ import { CANONICAL_TOWN_STASHES, type TownStashEntity } from '../src/common/worl
 import {
   WorldPanelsHud,
   STASH_GOLD_CAP,
-  PLAYER_GOLD_CAP,
 } from '../src/client/ui/world-panels.ts'
 import { HudManager } from '../src/client/ui/hud-manager.ts'
 import { GameEngine } from '../src/server/engine/engine.ts'
@@ -130,181 +129,12 @@ describe('Challenger M5 Empirical Stress Test: Town Stash Entities, Interaction
       panels.stashGold = 100_000
     })
 
-    it('deposit and withdraw valid amounts: character gold + stash gold remains strictly constant', () => {
+    it('stash gold cap is the D2Common #11060 constant (2,500,000); gold transfers are server-driven', () => {
-      const initialTotal = inv.gold + panels.stashGold // 600,000
-
-      const transferSequence = [10_000, 50_000, 100_000, 25_000, 1_000, 777]
-      for (const amt of transferSequence) {
-        const deposited = panels.depositGold(amt, inv)
-        expect(deposited).toBe(amt)
-        expect(inv.gold + panels.stashGold).toBe(initialTotal)
-      }
-
-      const withdrawSequence = [5_000, 20_000, 80_000, 500, 123]
-      for (const amt of withdrawSequence) {
-        const withdrawn = panels.withdrawGold(amt, inv)
-        expect(withdrawn).toBe(amt)
-        expect(inv.gold + panels.stashGold).toBe(initialTotal)
-      }
-    })
-
-    it('stress tests 100 random valid transactions preserving gold conservation law', () => {
-      const initialTotal = inv.gold + panels.stashGold // 600,000
-      let seed = 123456789
-      const nextRand = () => {
-        seed = (seed * 1664525 + 1013904223) >>> 0
-        return seed / 4294967296
-      }
-
-      for (let i = 0; i < 100; i++) {
-        if (nextRand() > 0.5) {
-          // Deposit random amount up to player's current gold
-          const amt = Math.floor(nextRand() * (inv.gold + 1))
-          panels.depositGold(amt, inv)
-        } else {
-          // Withdraw random amount up to stash's current gold
-          const amt = Math.floor(nextRand() * (panels.stashGold + 1))
-          panels.withdrawGold(amt, inv)
-        }
-        // Strict conservation invariant:
-        expect(inv.gold + panels.stashGold).toBe(initialTotal)
-        expect(inv.gold).toBeGreaterThanOrEqual(0)
-        expect(panels.stashGold).toBeGreaterThanOrEqual(0)
-      }
-    })
-
-    it('negative values (e.g. -500 gold): must be rejected or no-op without balance mutation', () => {
-      const initialInv = inv.gold
-      const initialStash = panels.stashGold
-
-      const negativeAmounts = [-1, -500, -10_000, -2_500_000, -1e9, Number.MIN_SAFE_INTEGER]
-      for (const neg of negativeAmounts) {
-        expect(panels.depositGold(neg, inv)).toBe(0)
-        expect(inv.gold).toBe(initialInv)
-        expect(panels.stashGold).toBe(initialStash)
-
-        expect(panels.withdrawGold(neg, inv)).toBe(0)
-        expect(inv.gold).toBe(initialInv)
-        expect(panels.stashGold).toBe(initialStash)
-      }
-    })
-
-    it('zero and -0 value transfers: must be rejected as no-op', () => {
-      expect(panels.depositGold(0, inv)).toBe(0)
-      expect(panels.depositGold(-0, inv)).toBe(0)
-      expect(panels.withdrawGold(0, inv)).toBe(0)
-      expect(panels.withdrawGold(-0, inv)).toBe(0)
-      expect(inv.gold).toBe(500_000)
-      expect(panels.stashGold).toBe(100_000)
-    })
-
-    it('exceeding player gold on deposit: deposits max available without creating negative player gold', () => {
-      inv.gold = 35_000
-      panels.stashGold = 50_000
-
-      const deposited = panels.depositGold(100_000, inv)
-      expect(deposited).toBe(35_000)
-      expect(inv.gold).toBe(0)
-      expect(panels.stashGold).toBe(85_000)
-
-      // Further deposit when player gold is 0 yields 0
-      expect(panels.depositGold(10_000, inv)).toBe(0)
-      expect(inv.gold).toBe(0)
-      expect(panels.stashGold).toBe(85_000)
-    })
-
-    it('exceeding stash gold on withdraw: withdraws max available without creating negative stash gold', () => {
-      panels.stashGold = 42_000
-      inv.gold = 10_000
-
-      const withdrawn = panels.withdrawGold(100_000, inv)
-      expect(withdrawn).toBe(42_000)
-      expect(panels.stashGold).toBe(0)
-      expect(inv.gold).toBe(52_000)
-
-      // Further withdrawal when stash gold is 0 yields 0
-      expect(panels.withdrawGold(10_000, inv)).toBe(0)
-      expect(panels.stashGold).toBe(0)
-      expect(inv.gold).toBe(52_000)
-    })
-
-    it('gold cap enforcement: character and stash gold cannot exceed 2,500,000', () => {
       expect(STASH_GOLD_CAP).toBe(2_500_000)
-      expect(PLAYER_GOLD_CAP).toBe(2_500_000)
+      // WorldPanelsHud no longer mutates gold locally: deposit/withdraw are sent as
-
+      // ClickButton commands by HudModel and the balance arrives via server stat updates.
-      // Stash cap clamping on deposit
+      expect((panels as unknown as Record<string, unknown>)['depositGold']).toBeUndefined()
-      panels.stashGold = 2_450_000
+      expect((panels as unknown as Record<string, unknown>)['withdrawGold']).toBeUndefined()
-      inv.gold = 200_000
-      const dep1 = panels.depositGold(100_000, inv)
-      expect(dep1).toBe(50_000)
-      expect(panels.stashGold).toBe(2_500_000)
-      expect(inv.gold).toBe(150_000)
-
-      // Further deposits clamped to 0
-      expect(panels.depositGold(50_000, inv)).toBe(0)
-      expect(panels.stashGold).toBe(2_500_000)
-      expect(inv.gold).toBe(150_000)
-
-      // Player cap clamping on withdrawal
-      inv.gold = 2_480_000
-      panels.stashGold = 500_000
-      const w1 = panels.withdrawGold(100_000, inv)
-      expect(w1).toBe(20_000)
-      expect(inv.gold).toBe(2_500_000)
-      expect(panels.stashGold).toBe(480_000)
-
-      // Further withdrawals clamped to 0
-      expect(panels.withdrawGold(10_000, inv)).toBe(0)
-      expect(inv.gold).toBe(2_500_000)
-      expect(panels.stashGold).toBe(480_000)
-    })
-
-    it('boundary caps: handles both character and stash at 2,500,000 or both at 0', () => {
-      // Both at zero
-      inv.gold = 0
-      panels.stashGold = 0
-      expect(panels.depositGold(10_000, inv)).toBe(0)
-      expect(panels.withdrawGold(10_000, inv)).toBe(0)
-      expect(inv.gold).toBe(0)
-      expect(panels.stashGold).toBe(0)
-
-      // Both at maximum 2,500,000
-      inv.gold = 2_500_000
-      panels.stashGold = 2_500_000
-      expect(panels.depositGold(10_000, inv)).toBe(0)
-      expect(panels.withdrawGold(10_000, inv)).toBe(0)
-      expect(inv.gold).toBe(2_500_000)
-      expect(panels.stashGold).toBe(2_500_000)
-    })
-
-    it('infinity and extreme numbers: safely clamps or rejects without corrupting finite state', () => {
-      inv.gold = 300_000
-      panels.stashGold = 100_000
-
-      // Deposit Infinity: clamped to player's entire available gold
-      const depInf = panels.depositGold(Infinity, inv)
-      expect(depInf).toBe(300_000)
-      expect(inv.gold).toBe(0)
-      expect(panels.stashGold).toBe(400_000)
-
-      // Withdraw Infinity: clamped to stash's entire available gold
-      const wInf = panels.withdrawGold(Infinity, inv)
-      expect(wInf).toBe(400_000)
-      expect(inv.gold).toBe(400_000)
-      expect(panels.stashGold).toBe(0)
-
-      // Negative infinity: rejected as <= 0
-      expect(panels.depositGold(-Infinity, inv)).toBe(0)
-      expect(panels.withdrawGold(-Infinity, inv)).toBe(0)
-      expect(inv.gold).toBe(400_000)
-      expect(panels.stashGold).toBe(0)
-
-      // Number.MAX_SAFE_INTEGER
-      inv.gold = 50_000
-      const depMaxSafe = panels.depositGold(Number.MAX_SAFE_INTEGER, inv)
-      expect(depMaxSafe).toBe(50_000)
-      expect(inv.gold).toBe(0)
-      expect(panels.stashGold).toBe(50_000)
     })
 
     it('does not intercept bottom keyhole ornament clicks as non-authentic deposit/withdraw buttons', () => {

tests/client/gamble-replay-ui.test.ts

@@ -0,0 +1,117 @@
+/**
+ * Gamble UI over live capture 09 (Gheed, WebBotThree with 2 gold): the menu sends 0x38 action 2,
+ * the gamble grid is exactly the server's 0x9C AddToShop items, clicking a ring sends a gamble
+ * 0x32 NpcBuy, and the server's rejection (0x2A result 12) shows tbl string 3362.
+ */
+import path from 'node:path'
+import { describe, expect, it } from 'vitest'
+import { replayD2CapFile } from '../../tools/netproto-replay.ts'
+import type { ClientCommand, ServerEvent } from '../../src/netproto/index.ts'
+import { ClientWorld } from '../../src/client/world/client-world.ts'
+import { HudManager } from '../../src/client/ui/hud-manager.ts'
+import { VENDOR_GRID_ORIGIN } from '../../src/client/ui/world-panels.ts'
+import { requireTbl } from '../../src/client/i18n/lang.ts'
+import { HudModel } from '../../src/client/ui-model/hud-model.ts'
+import type { VendorPriceFn } from '../../src/client/ui-model/vendor-price.ts'
+
+const GAMBLE_CAPTURE = path.resolve(__dirname, '../fixtures/netproto/09-d2gs-gamble.d2cap')
+/** Gheed (MonStats hcIdx 147) is unit #4 in capture 09. */
+const GHEED_ID = 4
+const GHEED_CLASS = 147
+const MONSTER = 1
+
+const stubPrice: VendorPriceFn = (item, type) => 1000 * (type + 1) + item.id
+
+describe('gamble capture 09 -> HudModel / HudManager', () => {
+  it('menu -> NpcOpenGamble, server grid shown, ring click -> gamble NpcBuy, result 12 -> TransactionResults10', () => {
+    const r = replayD2CapFile(GAMBLE_CAPTURE, { strict: true })
+    expect(r.unknownPackets).toBe(0)
+    const world = new ClientWorld()
+    const hud = new HudManager()
+    const commands: ClientCommand[] = []
+    const model = new HudModel({
+      world,
+      hudManager: hud,
+      onCommand: (c) => {
+        commands.push(c)
+        world.noteOutgoingCommand(c)
+      },
+      vendorPrice: stubPrice,
+      vendorRepairAll: () => {
+        throw new Error('gamble stores have no Repair All')
+      },
+      playUiSound: () => {},
+      now: () => 10_000,
+    })
+
+    const firstShop = r.events.findIndex((e) => e.type === 'ItemEvent' && e.container === 'shop')
+    expect(firstShop).toBeGreaterThan(0)
+    for (const e of r.events.slice(0, firstShop)) world.apply(e)
+    model.syncFromWorld()
+    expect(world.getUnit('monster', GHEED_ID)?.classId).toBe(GHEED_CLASS)
+
+    // Click Gheed (C2S 0x13) -> NPC menu with "gamble".
+    world.noteOutgoingCommand({ type: 'NpcInit', target: { unitType: MONSTER, id: GHEED_ID } })
+    model.syncFromWorld()
+    const menu = hud.worldPanels.npcMenu!
+    expect(menu.npcId).toBe(GHEED_ID)
+    const gambleIdx = menu.options!.findIndex((o) => o.id === 'gamble')
+    expect(gambleIdx).toBeGreaterThanOrEqual(0)
+    const layout = hud.worldPanels.getNpcMenuLayout(hud.font)!
+    const down = (x: number, y: number, shiftKey = false) =>
+      hud.handleHudMouseDown({
+        clientX: x,
+        clientY: y,
+        button: 0,
+        shiftKey,
+        preventDefault: () => {},
+        stopPropagation: () => {},
+      } as unknown as MouseEvent)
+    down(layout.left + Math.trunc(layout.width / 2), layout.optionYs[gambleIdx]! - 3)
+    expect(commands).toEqual([{ type: 'NpcOpenGamble', npcId: GHEED_ID }])
+    expect(hud.leftPanel).toBe('vendor')
+
+    // Server fills the gamble grid; hold back the 0x2A reply until the click.
+    const rest = r.events.slice(firstShop)
+    const reply = rest.filter((e): e is Extract<ServerEvent, { type: 'NpcTransaction' }> => e.type === 'NpcTransaction')
+    expect(reply.map((e) => e.result)).toEqual([12])
+    for (const e of rest) if (e.type !== 'NpcTransaction') world.apply(e)
+    model.syncFromWorld()
+
+    const wp = hud.worldPanels
+    expect(wp.vendorMode).toBe('gamble')
+    expect(wp.gamblePlacements.length).toBe(world.containers.shop.size)
+    expect(wp.vendorRepairAllCost).toBeNull()
+    for (const pl of wp.gamblePlacements) {
+      const raw = world.containers.shop.get(Number(pl.item.id))!
+      expect(pl.item.buyCost).toBe(stubPrice(raw, 2, { world, npcClass: GHEED_CLASS }))
+    }
+
+    const ring = wp.gamblePlacements.find((pl) => pl.item.code === 'rin')!
+    expect(ring).toBeDefined()
+    const ringId = Number(ring.item.id)
+    const ringRaw = world.containers.shop.get(ringId)!
+    // Shift is ignored for gamble buys (D2Client sends shiftFill 0 in gamble mode).
+    down(
+      VENDOR_GRID_ORIGIN.x + ring.col * VENDOR_GRID_ORIGIN.cellPx + 5,
+      VENDOR_GRID_ORIGIN.y + ring.row * VENDOR_GRID_ORIGIN.cellPx + 5,
+      true,
+    )
+    expect(commands.at(-1)).toEqual({
+      type: 'NpcBuy',
+      npcId: GHEED_ID,
+      itemId: ringId,
+      itemMode: 0,
+      gamble: true,
+      shiftFill: false,
+      cost: stubPrice(ringRaw, 2, { world, npcClass: GHEED_CLASS }),
+    })
+    expect(world.self.gold).toBe(2)
+
+    for (const e of reply) world.apply(e)
+    model.syncFromWorld()
+    expect(model.lastNpcTransactionMessage).toEqual({ tblKey: 'TransactionResults10', text: requireTbl('TransactionResults10', 'CHI') })
+    expect(world.self.gold).toBe(2)
+    expect(world.containers.shop.has(ringId)).toBe(true)
+  })
+})

tests/client/transaction-cost-input.test.ts

@@ -0,0 +1,37 @@
+/**
+ * Display prices for real server items (captures 05-09) through the 1.13c #10107/#10071 port.
+ */
+import path from 'node:path'
+import { describe, expect, it } from 'vitest'
+import { replayD2CapFile } from '../../tools/netproto-replay.ts'
+import { priceItem113c, repairAllCost113c } from '../../src/client/ui-model/transaction-cost-input.ts'
+
+const FIXTURES = path.resolve(__dirname, '../fixtures/netproto')
+const CHARSI = 154
+const GHEED = 147
+
+describe('1.13c prices for captured server items', () => {
+  it('prices every Charsi shop item (capture 05) without missing data', () => {
+    const { world } = replayD2CapFile(path.join(FIXTURES, '05-d2gs-vendor-open.d2cap'))
+    const shop = [...world.containers.shop.values()]
+    expect(shop.length).toBe(46)
+    for (const it of shop) {
+      const p = priceItem113c(world, it, 0, CHARSI)
+      expect(Number.isInteger(p)).toBe(true)
+      expect(p).toBeGreaterThan(0)
+    }
+  })
+
+  it('every gamble preview (capture 09) costs more than the 2 gold that made the server reject it (0x2A result 12)', () => {
+    const { world } = replayD2CapFile(path.join(FIXTURES, '09-d2gs-gamble.d2cap'))
+    const shop = [...world.containers.shop.values()]
+    expect(shop.length).toBe(14)
+    for (const it of shop) expect(priceItem113c(world, it, 2, GHEED)).toBeGreaterThan(2)
+  })
+
+  it('repair-all costs 0 with full durability (capture 07: server answered result 2 flag 1, gold unchanged)', () => {
+    const { world } = replayD2CapFile(path.join(FIXTURES, '07-d2gs-vendor-repair.d2cap'))
+    expect(world.containers.equipment.size).toBe(2)
+    expect(repairAllCost113c(world, CHARSI)).toBe(0)
+  })
+})

tests/client/vendor-stash-replay.test.ts

@@ -0,0 +1,92 @@
+/**
+ * Vendor / stash / gamble ClientWorld replay over live 1.13c captures 05-09
+ * (WebBotThree, clvl 1, 2 gold). Everything asserted here is what the server sent.
+ */
+import path from 'node:path'
+import { describe, expect, it } from 'vitest'
+import { replayD2CapFile, type ReplayResult } from '../../tools/netproto-replay.ts'
+import { ClickButtonId, type ServerEvent } from '../../src/netproto/index.ts'
+
+const FIXTURES = path.resolve(__dirname, '../fixtures/netproto')
+const replay = (name: string): ReplayResult => {
+  const r = replayD2CapFile(path.join(FIXTURES, name), { strict: true })
+  expect(r.unknownPackets).toBe(0)
+  expect(r.opaquePackets).toBe(0)
+  expect(r.protocolErrors).toBe(0)
+  return r
+}
+type Tx = Extract<ServerEvent, { type: 'NpcTransaction' }>
+const txs = (r: ReplayResult): Tx[] => r.events.filter((e): e is Tx => e.type === 'NpcTransaction')
+const MONSTER = 1
+
+describe('vendor/stash captures -> ClientWorld', () => {
+  it('05 vendor-open: Charsi store arrives only as 0x9C AddToShop and is freed locally on 0x30', () => {
+    const r = replay('05-d2gs-vendor-open.d2cap')
+    const shop = [...r.world.containers.shop.values()]
+    expect(shop.length).toBe(46)
+    for (const it of shop) {
+      expect(it.action).toBe(0x0b)
+      expect([1, 2, 3, 4]).toContain(it.storePage)
+      expect(it.gridX).toBeGreaterThanOrEqual(0)
+      expect(it.gridX).toBeLessThan(10)
+      expect(it.gridY).toBeGreaterThanOrEqual(0)
+      expect(it.gridY).toBeLessThan(10)
+    }
+    expect(txs(r)).toEqual([])
+    // The capture ends after C2S 0x30 with no RemoveFromShop; the client frees the store itself.
+    const npcId = r.world.npcInteraction.npcId
+    r.world.noteOutgoingCommand({ type: 'NpcCancel', target: { unitType: MONSTER, id: 6 } })
+    expect(npcId).toBeNull() // replay feeds S2C only; NpcInit was never noted
+    expect(r.world.containers.shop.size).toBe(0)
+    expect(r.world.npcInteraction.window).toBe('none')
+  })
+
+  it('06 vendor-buy-sell: sells remove the item (act 5 loc 0), buys without gold are rejected with result 12', () => {
+    const r = replay('06-d2gs-vendor-buy-sell.d2cap')
+    const t = txs(r)
+    const sells = t.filter(x => x.flag === 3)
+    expect(sells.length).toBe(2)
+    for (const s of sells) {
+      expect(s.result).toBe(1)
+      expect(s.itemId).not.toBe(0xffffffff)
+    }
+    const rejects = t.filter(x => x.result === 12)
+    expect(rejects.length).toBeGreaterThan(0)
+    for (const x of rejects) {
+      expect(x.flag).toBe(0)
+      expect(x.itemId).toBe(0xffffffff)
+    }
+    // Sold items must not reappear on the cursor (0x9D act 5 with location 0).
+    expect(r.world.containers.cursor).toBeNull()
+    expect(r.world.containers.inventory.size).toBe(0)
+    expect(r.world.self.gold).toBe(sells[sells.length - 1]!.gold)
+    expect(r.world.lastNpcTransaction?.seq).toBe(t.length)
+  })
+
+  it('07 vendor-repair: undamaged repair -> result 9, repair-all with nothing damaged -> result 2 flag 1', () => {
+    const r = replay('07-d2gs-vendor-repair.d2cap')
+    expect(txs(r).map(x => [x.result, x.flag, x.itemId])).toEqual([
+      [9, 0, 0xffffffff],
+      [2, 1, 0xffffffff],
+    ])
+    expect(r.world.self.gold).toBe(2)
+  })
+
+  it('08 stash-gold: 0x77 0x10 opens the stash; deposit/withdraw update stats 15/14; close is local', () => {
+    const r = replay('08-d2gs-stash-gold.d2cap')
+    expect(r.events.some(e => e.type === 'Trade' && e.action === 0x10)).toBe(true)
+    expect(r.world.npcInteraction.stashOpen).toBe(true)
+    expect(r.world.self.gold).toBe(2)
+    expect(r.world.self.stashGold).toBe(0)
+    r.world.noteOutgoingCommand({ type: 'ClickButton', buttonId: ClickButtonId.CloseStash, amount: 0 })
+    expect(r.world.npcInteraction.stashOpen).toBe(false)
+  })
+
+  it('09 gamble: Gheed gamble store fills via 0x9C; gambling a ring with 2 gold is rejected (result 12)', () => {
+    const r = replay('09-d2gs-gamble.d2cap')
+    const codes = [...r.world.containers.shop.values()].map(i => i.code)
+    expect(codes).toContain('rin')
+    expect(codes).toContain('amu')
+    expect(txs(r).map(x => [x.result, x.flag, x.itemId])).toEqual([[12, 0, 0xffffffff]])
+  })
+})

tests/client/vendor-stash-ui.test.ts

@@ -0,0 +1,357 @@
+/**
+ * Server-driven store / stash / gold UI (D2Client 1.13c): every click becomes a `ClientCommand`,
+ * nothing is bought, sold, repaired or moved locally. World state comes from the live captures
+ * 05 (Charsi store), 06 (sells + rejected buys) and 08 (stash) replayed into a fresh `ClientWorld`.
+ */
+import path from 'node:path'
+import { describe, expect, it } from 'vitest'
+import { replayD2CapFile } from '../../tools/netproto-replay.ts'
+import { ClickButtonId, type ClientCommand, type ServerEvent } from '../../src/netproto/index.ts'
+import { ClientWorld } from '../../src/client/world/client-world.ts'
+import { D2StatId } from '../../src/client/world/stat-list.ts'
+import { HudManager } from '../../src/client/ui/hud-manager.ts'
+import { STASH_GOLD_BTN_HIT, VENDOR_BUTTON_TABLE_X, VENDOR_GRID_ORIGIN } from '../../src/client/ui/world-panels.ts'
+import { requireTbl } from '../../src/client/i18n/lang.ts'
+import {
+  HudModel,
+  NPC_SELL_SOUND_ID,
+  NPC_TRADE_THROTTLE_MS,
+  npcTransactionMessageKey,
+} from '../../src/client/ui-model/hud-model.ts'
+import type { VendorPriceFn, VendorRepairAllFn } from '../../src/client/ui-model/vendor-price.ts'
+
+const FIXTURES = path.resolve(__dirname, '../fixtures/netproto')
+/** Charsi (MonStats hcIdx 154) is unit #6 in captures 05-07. */
+const CHARSI_ID = 6
+/** Akara (hcIdx 148) is unit #5 in capture 06 (Charsi #6 leaves the client view first). */
+const AKARA_ID = 5
+const MONSTER = 1
+const REPAIR_ALL_STUB = 777
+/** Left-dock panel origin (WorldPanelsHud ox / oy). */
+const STASH_X = 80
+const STASH_Y = 60
+
+/** Display-only price stub (D2Game ignores the client cost): distinct per item and transaction type. */
+const stubPrice: VendorPriceFn = (item, type) => 1000 * (type + 1) + item.id
+const stubRepairAll: VendorRepairAllFn = () => REPAIR_ALL_STUB
+
+function createSession() {
+  const world = new ClientWorld()
+  const hud = new HudManager()
+  const commands: ClientCommand[] = []
+  const sounds: number[] = []
+  const clock = { t: 50_000 }
+  const model = new HudModel({
+    world,
+    hudManager: hud,
+    // OnlineSession.forwardCommandToAdapter notes every sent command on the world.
+    onCommand: (c) => {
+      commands.push(c)
+      world.noteOutgoingCommand(c)
+    },
+    vendorPrice: stubPrice,
+    vendorRepairAll: stubRepairAll,
+    playUiSound: (id) => sounds.push(id),
+    now: () => clock.t,
+  })
+  return { world, hud, model, commands, sounds, clock }
+}
+
+function loadCapture(name: string): readonly ServerEvent[] {
+  const r = replayD2CapFile(path.join(FIXTURES, name), { strict: true })
+  expect(r.unknownPackets).toBe(0)
+  return r.events
+}
+
+const isShopItem = (e: ServerEvent): boolean => e.type === 'ItemEvent' && e.container === 'shop'
+
+/** Replay up to the store contents, click the NPC (C2S 0x13 NpcInit) and return the remaining events. */
+function walkUpToNpc(s: ReturnType<typeof createSession>, events: readonly ServerEvent[], npcId: number): ServerEvent[] {
+  const firstShop = events.findIndex(isShopItem)
+  expect(firstShop).toBeGreaterThan(0)
+  for (const e of events.slice(0, firstShop)) s.world.apply(e)
+  s.model.syncFromWorld()
+  s.world.noteOutgoingCommand({ type: 'NpcInit', target: { unitType: MONSTER, id: npcId } })
+  s.model.syncFromWorld()
+  return events.slice(firstShop)
+}
+
+function mouseDown(hud: HudManager, x: number, y: number, opts: { button?: number; shiftKey?: boolean } = {}): void {
+  hud.handleHudMouseDown({
+    clientX: x,
+    clientY: y,
+    button: opts.button ?? 0,
+    shiftKey: opts.shiftKey ?? false,
+    preventDefault: () => {},
+    stopPropagation: () => {},
+  } as unknown as MouseEvent)
+}
+
+function clickNpcOption(hud: HudManager, optionId: string): void {
+  const menu = hud.worldPanels.npcMenu
+  if (!menu?.options) throw new Error('no NPC menu')
+  const idx = menu.options.findIndex((o) => o.id === optionId)
+  expect(idx).toBeGreaterThanOrEqual(0)
+  const layout = hud.worldPanels.getNpcMenuLayout(hud.font)!
+  mouseDown(hud, layout.left + Math.trunc(layout.width / 2), layout.optionYs[idx]! - 3)
+}
+
+function openCharsiStore(capture: string, keep: (e: ServerEvent) => boolean = () => true) {
+  const s = createSession()
+  const rest = walkUpToNpc(s, loadCapture(capture), CHARSI_ID)
+  s.model.openNpcTrade(CHARSI_ID)
+  for (const e of rest) if (keep(e)) s.world.apply(e)
+  s.model.syncFromWorld()
+  return s
+}
+
+describe('NPC menu -> server store', () => {
+  it('NpcInit opens the descriptor menu; "trade/repair" sends 0x38 and the 0x9C store fills the panel with display prices', () => {
+    const s = createSession()
+    const rest = walkUpToNpc(s, loadCapture('05-d2gs-vendor-open.d2cap'), CHARSI_ID)
+    const menu = s.hud.worldPanels.npcMenu
+    expect(menu?.npcId).toBe(CHARSI_ID)
+    expect(menu?.options?.map((o) => o.id)).toContain('trade')
+
+    clickNpcOption(s.hud, 'trade')
+    expect(s.commands).toEqual([{ type: 'NpcOpenTrade', npcId: CHARSI_ID }])
+    expect(s.hud.leftPanel).toBe('vendor')
+    expect(s.world.npcInteraction.window).toBe('trade')
+
+    for (const e of rest) s.world.apply(e)
+    s.model.syncFromWorld()
+    const wp = s.hud.worldPanels
+    const shown = Object.values(wp.vendorTabPlacements).flat()
+    expect(shown.length).toBe(s.world.containers.shop.size)
+    expect(shown.length).toBe(46)
+    for (const pl of shown) {
+      const raw = s.world.containers.shop.get(Number(pl.item.id))!
+      expect(pl.item.buyCost).toBe(stubPrice(raw, 0, { world: s.world, npcClass: 154 }))
+      expect(pl.col).toBe(raw.gridX)
+      expect(pl.row).toBe(raw.gridY)
+    }
+    expect(wp.vendorRepairAllCost).toBe(REPAIR_ALL_STUB)
+    // Player items carry the sell value (type 1) and, at a smith, the repair cost (type 3).
+    for (const pl of s.hud.inventory.gridItems) {
+      expect(pl.item.sellCost).toBe(1000 * 2 + Number(pl.item.id))
+    }
+    const axeRaw = [...s.world.containers.equipment.values()].find((i) => i.code === 'hax')!
+    const axe = s.hud.inventory.equipped.weapon1
+    expect(axe?.id).toBe(String(axeRaw.id))
+    expect(axe?.repairCost).toBe(1000 * 4 + axeRaw.id)
+
+    // Closing the panel sends 0x30 and frees the store locally (no RemoveFromShop arrives).
+    s.hud.closeAllPanels()
+    expect(s.commands.at(-1)).toEqual({ type: 'NpcCancel', target: { unitType: MONSTER, id: CHARSI_ID } })
+    expect(s.world.containers.shop.size).toBe(0)
+    expect(s.hud.leftPanel).toBe('none')
+    expect(wp.activeVendorDescriptor).toBeNull()
+  })
+
+  it('"cancel" and clicks outside the menu send NpcCancel', () => {
+    const s = createSession()
+    walkUpToNpc(s, loadCapture('05-d2gs-vendor-open.d2cap'), CHARSI_ID)
+    clickNpcOption(s.hud, 'cancel')
+    expect(s.commands).toEqual([{ type: 'NpcCancel', target: { unitType: MONSTER, id: CHARSI_ID } }])
+    expect(s.hud.worldPanels.npcMenu).toBeNull()
+
+    s.world.noteOutgoingCommand({ type: 'NpcInit', target: { unitType: MONSTER, id: CHARSI_ID } })
+    s.model.syncFromWorld()
+    expect(s.hud.worldPanels.npcMenu?.npcId).toBe(CHARSI_ID)
+    mouseDown(s.hud, 20, 20)
+    expect(s.commands.at(-1)).toEqual({ type: 'NpcCancel', target: { unitType: MONSTER, id: CHARSI_ID } })
+    expect(s.hud.worldPanels.npcMenu).toBeNull()
+  })
+
+  it('Charsi does not gamble: openNpcGamble fails fast', () => {
+    const s = createSession()
+    walkUpToNpc(s, loadCapture('05-d2gs-vendor-open.d2cap'), CHARSI_ID)
+    expect(() => s.model.openNpcGamble(CHARSI_ID)).toThrow(/does not gamble/)
+    expect(s.commands).toEqual([])
+  })
+
+  it('a store needs price providers: without them openNpcTrade throws before sending', () => {
+    const world = new ClientWorld()
+    const commands: ClientCommand[] = []
+    const model = new HudModel({ world, hudManager: new HudManager(), onCommand: (c) => commands.push(c) })
+    expect(() => model.openNpcTrade(CHARSI_ID)).toThrow(/vendorPrice/)
+    expect(commands).toEqual([])
+  })
+})
+
+describe('store actions are commands only', () => {
+  it('buy / shift-buy click the store grid -> 0x32 with itemMode 0 and the #10107 price, throttled to one per 2000 ms', () => {
+    const s = openCharsiStore('05-d2gs-vendor-open.d2cap')
+    const before = s.commands.length
+    const pl = s.hud.worldPanels.getActiveVendorPlacements()[0]!
+    const x = VENDOR_GRID_ORIGIN.x + pl.col * VENDOR_GRID_ORIGIN.cellPx + 5
+    const y = VENDOR_GRID_ORIGIN.y + pl.row * VENDOR_GRID_ORIGIN.cellPx + 5
+    const itemId = Number(pl.item.id)
+    const raw = s.world.containers.shop.get(itemId)!
+    const shopSize = s.world.containers.shop.size
+    const gold = s.world.self.gold
+
+    mouseDown(s.hud, x, y)
+    expect(s.commands.slice(before)).toEqual([
+      { type: 'NpcBuy', npcId: CHARSI_ID, itemId, itemMode: 0, gamble: false, shiftFill: false, cost: stubPrice(raw, 0, { world: s.world, npcClass: 154 }) },
+    ])
+    // Second click inside the throttle window is dropped.
+    mouseDown(s.hud, x, y, { shiftKey: true })
+    expect(s.commands.length).toBe(before + 1)
+    s.clock.t += NPC_TRADE_THROTTLE_MS
+    mouseDown(s.hud, x, y, { shiftKey: true })
+    expect(s.commands.at(-1)).toMatchObject({ type: 'NpcBuy', itemId, shiftFill: true, gamble: false })
+
+    // Nothing changed locally: the server answers with 0x2A / 0x9C / stat 14.
+    expect(s.world.containers.shop.size).toBe(shopSize)
+    expect(s.world.self.gold).toBe(gold)
+    expect(s.hud.inventory.cursorItem).toBeNull()
+  })
+
+  it('sell / repair / repair-all send 0x33 / 0x35 with the current durability; repair and repair-all share one throttle', () => {
+    const s = openCharsiStore('05-d2gs-vendor-open.d2cap')
+    const before = s.commands.length
+    const scroll = [...s.world.containers.inventory.values()].find((i) => i.code === 'tsc')!
+    const axe = [...s.world.containers.equipment.values()].find((i) => i.code === 'hax')!
+
+    expect(s.model.vendorSell(scroll.id)).toBe(true)
+    expect(s.model.vendorSell(scroll.id)).toBe(false)
+    expect(s.model.vendorRepairItem(axe.id)).toBe(true)
+    expect(s.model.vendorRepairAll()).toBe(false)
+    s.clock.t += NPC_TRADE_THROTTLE_MS
+    expect(s.model.vendorRepairAll()).toBe(true)
+
+    expect(s.commands.slice(before)).toEqual([
+      { type: 'NpcSell', npcId: CHARSI_ID, itemId: scroll.id, itemMode: 0, cost: stubPrice(scroll, 1, { world: s.world, npcClass: 154 }) },
+      { type: 'NpcRepairItem', npcId: CHARSI_ID, itemId: axe.id, itemMode: 0, durability: 28 },
+      { type: 'NpcRepairAll', npcId: CHARSI_ID },
+    ])
+    expect(s.world.containers.inventory.has(scroll.id)).toBe(true)
+    expect(s.world.containers.equipment.get(axe.id)?.curDurability).toBe(28)
+  })
+
+  it('Repair All button and holding a cursor item over the store grid go through the command sink', () => {
+    const s = openCharsiStore('05-d2gs-vendor-open.d2cap')
+    const before = s.commands.length
+    const wp = s.hud.worldPanels
+    // Charsi button table [buy, sell, repair, repairAll]; slot 3 = Repair All.
+    wp.handleLeftDockClick('vendor', 80 + VENDOR_BUTTON_TABLE_X[3] + 20, 60 + 390, {
+      onClose: () => {},
+      onWaypointTeleport: () => {},
+      onVendorRepairAll: () => s.model.vendorRepairAll(),
+    })
+    expect(s.commands.slice(before)).toEqual([{ type: 'NpcRepairAll', npcId: CHARSI_ID }])
+  })
+
+  it('a store action with no store open fails fast', () => {
+    const s = createSession()
+    expect(() => s.model.vendorBuy(1, false)).toThrow(/no store window/)
+    expect(() => s.model.vendorRepairAll()).toThrow(/no store window/)
+  })
+})
+
+describe('S2C 0x2A NpcTransaction feedback', () => {
+  it('successful sells (result 1) play UI sound 0xdd; rejected buys (result 12) show TransactionResults10 (tbl 3362)', () => {
+    const s = createSession()
+    const rest = walkUpToNpc(s, loadCapture('06-d2gs-vendor-buy-sell.d2cap'), AKARA_ID)
+    s.model.openNpcTrade(AKARA_ID)
+    expect(s.hud.worldPanels.vendorRepairAllCost).toBeNull()
+    for (const e of rest) {
+      s.world.apply(e)
+      s.model.syncFromWorld()
+    }
+    expect(s.sounds).toEqual([NPC_SELL_SOUND_ID, NPC_SELL_SOUND_ID])
+    expect(s.model.lastNpcTransactionMessage).toEqual({ tblKey: 'TransactionResults10', text: requireTbl('TransactionResults10', 'CHI') })
+    // Gold comes only from stat 14 (2 gold after the two sells).
+    expect(s.hud.inventory.gold).toBe(s.world.self.gold)
+  })
+})
+
+describe('NPC store tbl strings', () => {
+  it('every 0x2A message key and store/gold-dialog key is packed in both languages', () => {
+    const keys = new Set<string>()
+    for (let result = 0; result <= 20; result++) {
+      const k = npcTransactionMessageKey(result)
+      if (k !== null) keys.add(k)
+    }
+    expect([...keys].sort()).toEqual([
+      'TransactionResults10',
+      'TransactionResults11',
+      'TransactionResults4',
+      'TransactionResults5',
+      'TransactionResults6',
+      'TransactionResults8',
+      'TransactionResults9',
+    ])
+    for (const k of [...keys, 'cost', 'Repair', 'Sell', 'ok', 'Back', 'strDropGoldHowMuch', 'strBankGoldDeposit', 'strBankGoldWithdraw']) {
+      expect(requireTbl(k, 'ENG').length).toBeGreaterThan(0)
+      expect(requireTbl(k, 'CHI').length).toBeGreaterThan(0)
+    }
+    expect(requireTbl('patchstring#95', 'ENG')).toBe('Repair all equipment: %d')
+    expect(requireTbl('patchstring#95', 'CHI')).toBe('修復所有裝備：%d')
+    expect(() => requireTbl('notAPackedKey', 'ENG')).toThrow(/not packed/)
+  })
+})
+
+describe('stash and gold dialog', () => {
+  function openStash() {
+    const s = createSession()
+    for (const e of loadCapture('08-d2gs-stash-gold.d2cap')) s.world.apply(e)
+    s.model.syncFromWorld()
+    expect(s.hud.leftPanel).toBe('stash')
+    s.world.apply({ type: 'StatSet', stat: D2StatId.Gold, value: 5000 })
+    s.world.apply({ type: 'StatSet', stat: D2StatId.GoldBank, value: 1200 })
+    s.model.syncFromWorld()
+    expect(s.hud.inventory.gold).toBe(5000)
+    expect(s.hud.worldPanels.stashGold).toBe(1200)
+    return s
+  }
+
+  it('deposit (mode 3) is pre-filled with the bag gold; typed digits replace it; ok sends 0x4F 0x14', () => {
+    const s = openStash()
+    s.hud.openGoldDialog(3)
+    expect(s.hud.goldDialog).toEqual({ mode: 3, amount: 5000, fresh: true })
+    s.hud.typeGoldDialogKey('7')
+    s.hud.typeGoldDialogKey('5')
+    s.hud.confirmGoldDialog()
+    expect(s.commands).toEqual([{ type: 'ClickButton', buttonId: ClickButtonId.DepositGold, amount: 75 }])
+    expect(s.hud.inventory.gold).toBe(5000)
+    expect(s.hud.worldPanels.stashGold).toBe(1200)
+  })
+
+  it('withdraw (mode 4) clamps to the stash balance; 0 sends nothing; drop (mode 0) sends 0x15 DropGold', () => {
+    const s = openStash()
+    s.hud.openGoldDialog(4)
+    s.hud.setGoldDialogAmount(99_999)
+    expect(s.hud.goldDialog?.amount).toBe(1200)
+    s.hud.confirmGoldDialog()
+    s.hud.openGoldDialog(4)
+    s.hud.setGoldDialogAmount(0)
+    s.hud.confirmGoldDialog()
+    s.hud.openGoldDialog(0)
+    s.hud.setGoldDialogAmount(10)
+    s.hud.confirmGoldDialog()
+    expect(s.commands).toEqual([
+      { type: 'ClickButton', buttonId: ClickButtonId.WithdrawGold, amount: 1200 },
+      { type: 'DropGold', unitId: s.world.selfId, amount: 10 },
+    ])
+    expect(s.hud.goldDialog).toBeNull()
+  })
+
+  it('the stash gold button opens the withdraw dialog; cancel sends nothing; closing the stash sends 0x4F 0x12', () => {
+    const s = openStash()
+    s.hud.worldPanels.handleLeftDockClick('stash', STASH_X + STASH_GOLD_BTN_HIT.relX0 + 10, STASH_Y + STASH_GOLD_BTN_HIT.relY0 + 5, {
+      onClose: () => {},
+      onWaypointTeleport: () => {},
+      onStashGoldButton: () => s.hud.openGoldDialog(4),
+    })
+    expect(s.hud.goldDialog?.mode).toBe(4)
+    s.hud.cancelGoldDialog()
+    expect(s.commands).toEqual([])
+
+    s.hud.closeAllPanels()
+    expect(s.commands).toEqual([{ type: 'ClickButton', buttonId: ClickButtonId.CloseStash, amount: 0 }])
+    expect(s.world.npcInteraction.stashOpen).toBe(false)
+    expect(() => s.hud.openGoldDialog(3)).toThrow(/stash open/)
+  })
+})

tests/cursor.test.ts

@@ -31,7 +31,8 @@ import {
   type CursorFrameMeta,
 } from '../src/common/items/cursor-meta.ts'
 import { BAKED_UI_MANIFEST } from '../src/common/items/baked-ui-meta.ts'
-import { HudManager } from '../src/client/ui/hud-manager.ts'
+import { HudManager, type HudCommandSink } from '../src/client/ui/hud-manager.ts'
+import { openGeneratedVendorShop } from './helpers/vendor-shop-fixture.ts'
 import { VENDOR_BUTTON_TABLE_X } from '../src/client/ui/world-panels.ts'
 import { seedDemoHud } from './fixtures/hud-demo-state.ts'
 
@@ -460,13 +461,14 @@ describe('Diablo II v1.13c Dynamic Cursor System (Issue #148 & #491)', () => {
     it('switches cursor to buysell.dc6 frame 3 (Buy), frame 4 (Sell), and frame 1 (Repair) when clicking vendor buttons, and resets on toggle/right-click/close', () => {
       const { hud, clickAt } = createTestHud()
 
-      // Server-not-ready HUD (no class assigned) refuses to open a vendor session
-      expect(() => hud.openVendorSession('Charsi', 'trade', 0)).toThrow(/character class/)
       // Explicitly seed the legacy demo Sorceress state (class, level, gold, inventory)
       seedDemoHud(hud)
+      const closeNpc = vi.fn()
+      hud.commandSink = { closeNpc } as unknown as HudCommandSink
 
-      // Open Charsi vendor panel
+      // Server opened Charsi's store (0x9C AddToShop items + NpcOpenTrade): HudModel fills and shows it
-      expect(hud.openVendorSession('Charsi', 'trade', 0)).toBe(true)
+      openGeneratedVendorShop(hud.worldPanels, 'Charsi', 'trade', 24, 0, 7)
+      hud.showVendorPanel()
       expect(hud.state.leftPanel).toBe('vendor')
       expect(hud.state.vendorTradeState).toBe('idle')
       expect(hud.state.cursorTradeMode).toBeNull()
@@ -512,6 +514,7 @@ describe('Diablo II v1.13c Dynamic Cursor System (Issue #148 & #491)', () => {
       expect(hud.state.cursorTradeMode).toBe('sell')
       hud.closeAllPanels()
       expect(hud.state.leftPanel).toBe('none')
+      expect(closeNpc).toHaveBeenCalledWith(7)
       expect(hud.state.cursorTradeMode).toBeNull()
       expect(hud.state.cursorAnimation).toBe('protate')
     })

tests/e2e-netproto/tier5-adversarial-coverage.test.ts

@@ -1213,9 +1213,16 @@ describe('Tier 5 Adversarial Coverage — F5–F8 D2GS Framing, Huffman, Tables
       { cmd: { type: 'Interact', target: { unitType: 'object', id: asUnitId(100) } }, expectedOpcodes: [0x13] },
       { cmd: { type: 'NpcInit', target: { unitType: 'monster', id: asUnitId(200) } }, expectedOpcodes: [0x2f] },
       { cmd: { type: 'NpcCancel', target: { unitType: 'monster', id: asUnitId(200) } }, expectedOpcodes: [0x30] },
-      { cmd: { type: 'NpcBuy', npcId: asUnitId(200), itemId: asUnitId(300), tab: 0, cost: 500 }, expectedOpcodes: [0x32] },
+      {
-      { cmd: { type: 'NpcSell', npcId: asUnitId(200), itemId: asUnitId(301), tab: 0, cost: 250 }, expectedOpcodes: [0x33] },
+        cmd: { type: 'NpcBuy', npcId: asUnitId(200), itemId: asUnitId(300), itemMode: 0, gamble: false, shiftFill: false, cost: 500 },
-      { cmd: { type: 'NpcRepair', npcId: asUnitId(200), itemId: asUnitId(302), tab: 0, cost: 100 }, expectedOpcodes: [0x35] },
+        expectedOpcodes: [0x32],
+      },
+      { cmd: { type: 'NpcSell', npcId: asUnitId(200), itemId: asUnitId(301), itemMode: 0, cost: 250 }, expectedOpcodes: [0x33] },
+      {
+        cmd: { type: 'NpcRepairItem', npcId: asUnitId(200), itemId: asUnitId(302), itemMode: 1, durability: 10 },
+        expectedOpcodes: [0x35],
+      },
+      { cmd: { type: 'NpcRepairAll', npcId: asUnitId(200) }, expectedOpcodes: [0x35] },
       { cmd: { type: 'WaypointGo', waypointId: asUnitId(400), destAreaId: 3 }, expectedOpcodes: [0x49] },
       { cmd: { type: 'ItemPickup', itemId: asUnitId(500), toCursor: false }, expectedOpcodes: [0x16] },
       { cmd: { type: 'ItemPickup', itemId: asUnitId(500), toCursor: true }, expectedOpcodes: [0x16] },

tests/fixtures/netproto/05-d2gs-vendor-open.d2cap

@@ -0,0 +1,266 @@
+{"format":"d2cap-v1","createdAt":"2026-10-01T09:50:38.057Z","server":"101.37.117.183 (via=mixed)","account":"<redacted>","character":"WebBotThree","scenario":"vendor-open"}
+{"t":1790848223242,"conn":"bnet","dir":"c2s","hex":"01","packetName":"BNCS_GREETING"}
+{"t":1790848223243,"conn":"bnet","dir":"c2s","hex":"ff503a000000000036385849505832440d000000090400007f000001e0010000090400000904000055534100556e697465642053746174657300","packetId":80,"packetName":"SID_AUTH_INFO"}
+{"t":1790848223289,"conn":"bnet","dir":"s2c","hex":"ff25080070ab8909","packetId":37,"packetName":"SID_PING"}
+{"t":1790848223289,"conn":"bnet","dir":"c2s","hex":"ff25080070ab8909","packetId":37,"packetName":"SID_PING"}
+{"t":1790848223333,"conn":"bnet","dir":"s2c","hex":"ff5065000000000015d5e7567200000000d8b1d80027dd0149583836766572312e6d707100413d3338343535383136333420423d38383038323335383020433d31333633393337313033203420413d412d5320423d422d4320433d432d4120413d412d4200","packetId":80,"packetName":"SID_AUTH_INFO"}
+{"t":1790848223334,"conn":"bnet","dir":"c2s","hex":"ff518b001dd6e3ac000d0001cabe867602000000000000001000000006000000cbba0000000000005e34a0be62533f73a5eba13ffc99572a3693cab9100000000a000000f015eb00000000008692ec8d918f275af4efedfef5db36ba24df014a47616d652e6578652030332f30392f31302030343a31303a353120363134343000576562506c6179657200","packetId":81,"packetName":"SID_AUTH_CHECK"}
+{"t":1790848223379,"conn":"bnet","dir":"s2c","hex":"ff5109000000000000","packetId":81,"packetName":"SID_AUTH_CHECK"}
+{"t":1790848223381,"conn":"bnet","dir":"c2s","hex":"ff3a2a001dd6e3ac15d5e756e73b5092f33177f5e41fe489a7e1a152761fc6a76432776562626f743300","packetId":58,"packetName":"SID_LOGONRESPONSE2"}
+{"t":1790848223425,"conn":"bnet","dir":"s2c","hex":"ff590400","packetId":89,"packetName":"SID_SETEMAIL"}
+{"t":1790848223516,"conn":"bnet","dir":"s2c","hex":"ff3a080000000000","packetId":58,"packetName":"SID_LOGONRESPONSE2"}
+{"t":1790848223517,"conn":"bnet","dir":"c2s","hex":"ff3e26001dd6e3ac3df8a4d24c1491bc6668260c1ab6a97b45355d3153616e63747561727900","packetId":62,"packetName":"SID_LOGONREALMEX"}
+{"t":1790848223563,"conn":"bnet","dir":"s2c","hex":"ff3e56001dd6e3ac000000000000000072000000652575b717e1000015d5e7560000000000000000505832440d00000000000000000000002df7d7a23de439c2be489f4ce012ebabbe6404f26432776562626f743300","packetId":62,"packetName":"SID_LOGONREALMEX"}
+{"t":1790848223956,"conn":"realm","dir":"c2s","hex":"01","packetName":"MCP_GREETING"}
+{"t":1790848223957,"conn":"realm","dir":"c2s","hex":"4d00011dd6e3ac00000000000000007200000015d5e7560000000000000000505832440d00000000000000000000002df7d7a23de439c2be489f4ce012ebabbe6404f26432776562626f743300","packetId":1,"packetName":"MCP_STARTUP"}
+{"t":1790848224006,"conn":"realm","dir":"s2c","hex":"07000100000000","packetId":1,"packetName":"MCP_STARTUP"}
+{"t":1790848224006,"conn":"realm","dir":"c2s","hex":"07001908000000","packetId":25,"packetName":"MCP_CHARLIST2"}
+{"t":1790848224054,"conn":"realm","dir":"s2c","hex":"3d00190800010000000100ffffff7f576562426f745468726565008d80ffffffffff04ff4fffffff05ffffffffffffffffffffff01e080808001ffff00","packetId":25,"packetName":"MCP_CHARLIST2"}
+{"t":1790848224054,"conn":"realm","dir":"c2s","hex":"0f0007576562426f74546872656500","packetId":7,"packetName":"MCP_CHARLOGON"}
+{"t":1790848224101,"conn":"realm","dir":"s2c","hex":"07000700000000","packetId":7,"packetName":"MCP_CHARLOGON"}
+{"t":1790848224103,"conn":"realm","dir":"c2s","hex":"23000301000000000001ff0877626d38336330000064322d626f74207265636f726400","packetId":3,"packetName":"MCP_CREATEGAME"}
+{"t":1790848224151,"conn":"realm","dir":"s2c","hex":"0d000301000100010000000000","packetId":3,"packetName":"MCP_CREATEGAME"}
+{"t":1790848224701,"conn":"realm","dir":"c2s","hex":"0e0004020077626d383363300000","packetId":4,"packetName":"MCP_JOINGAME"}
+{"t":1790848224752,"conn":"realm","dir":"s2c","hex":"150004020044000000652575b785f9f10b00000000","packetId":4,"packetName":"MCP_JOINGAME"}
+{"t":1790848224924,"conn":"game","dir":"s2c","hex":"af01","packetId":175}
+{"t":1790848224924,"conn":"game","dir":"c2s","hex":"6885f9f10b4400040d000000ed4d5650b453354200576562426f7454687265650000000000","packetId":104}
+{"t":1790848224974,"conn":"game","dir":"s2c","hex":"0100040030000101","packetId":1}
+{"t":1790848224975,"conn":"game","dir":"s2c","hex":"00","packetId":0}
+{"t":1790848225055,"conn":"game","dir":"s2c","hex":"02","packetId":2}
+{"t":1790848225055,"conn":"game","dir":"c2s","hex":"6b","packetId":107}
+{"t":1790848225055,"conn":"game","dir":"c2s","hex":"6d1f4fdff60000000000000000","packetId":109}
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+{"t":1790848225137,"conn":"game","dir":"s2c","hex":"22000001000000db0001cd00","packetId":34}
+{"t":1790848225137,"conn":"game","dir":"s2c","hex":"22000001000000d90001cd00","packetId":34}
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tests/fixtures/netproto/06-d2gs-vendor-buy-sell.d2cap

@@ -0,0 +1,336 @@
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tests/fixtures/netproto/07-d2gs-vendor-repair.d2cap

@@ -0,0 +1,294 @@
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tests/fixtures/netproto/08-d2gs-stash-gold.d2cap

@@ -0,0 +1,212 @@
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tests/fixtures/netproto/09-d2gs-gamble.d2cap

@@ -0,0 +1,248 @@
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+{"t":1790848614953,"conn":"game","dir":"s2c","hex":"aa01020000000c6959f9ff1f","packetId":170}
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+{"t":1790848614953,"conn":"game","dir":"s2c","hex":"1d0c01","packetId":29}
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+{"t":1790848614954,"conn":"game","dir":"s2c","hex":"4800000100000000000000","packetId":72}
+{"t":1790848614954,"conn":"game","dir":"s2c","hex":"5b24000100000004576562426f74546872656500000000000100ffff0000000000000000","packetId":91}
+{"t":1790848614954,"conn":"game","dir":"s2c","hex":"65010000000000","packetId":101}
+{"t":1790848614954,"conn":"game","dir":"s2c","hex":"8d01000000ffff","packetId":141}
+{"t":1790848614954,"conn":"game","dir":"s2c","hex":"5a02040000000000576562426f74546872656500000000006432776562626f743300000000000000","packetId":90}
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+{"t":1790848615427,"conn":"game","dir":"s2c","hex":"260400020000000001005b61646d696e6973747261746f725d00ff633954686520576f726c64204576656e7420656e61626c6573206f6e2074686973207365727665722e20546865206b6579206974656d20697320224b6579222eff633100","packetId":38}
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+{"t":1790848616955,"conn":"game","dir":"c2s","hex":"03d6103915","packetId":3}
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+{"t":1790848617400,"conn":"game","dir":"c2s","hex":"03d4103b15","packetId":3}
+{"t":1790848617666,"conn":"game","dir":"s2c","hex":"8a0107000000","packetId":138}
+{"t":1790848617796,"conn":"game","dir":"c2s","hex":"03d2103e15","packetId":3}
+{"t":1790848618303,"conn":"game","dir":"c2s","hex":"03d1104015","packetId":3}
+{"t":1790848618466,"conn":"game","dir":"s2c","hex":"8a0107000000","packetId":138}
+{"t":1790848618466,"conn":"game","dir":"s2c","hex":"670700000001d41039150100074b0005","packetId":103}
+{"t":1790848618466,"conn":"game","dir":"s2c","hex":"075003480401","packetId":7}
+{"t":1790848618466,"conn":"game","dir":"s2c","hex":"075803480401","packetId":7}
+{"t":1790848618466,"conn":"game","dir":"s2c","hex":"076003480401","packetId":7}
+{"t":1790848618466,"conn":"game","dir":"s2c","hex":"085003300401","packetId":8}
+{"t":1790848618466,"conn":"game","dir":"s2c","hex":"085803300401","packetId":8}
+{"t":1790848618466,"conn":"game","dir":"s2c","hex":"086003300401","packetId":8}
+{"t":1790848618545,"conn":"game","dir":"s2c","hex":"5102130000002500af106d150200","packetId":81}
+{"t":1790848618545,"conn":"game","dir":"s2c","hex":"0e0213000000030002000000","packetId":14}
+{"t":1790848618545,"conn":"game","dir":"s2c","hex":"ac08000000b30001117315800e01","packetId":172}
+{"t":1790848618546,"conn":"game","dir":"s2c","hex":"aa01080000000c6959f5ff1f","packetId":170}
+{"t":1790848618546,"conn":"game","dir":"s2c","hex":"6d080000000111731580","packetId":109}
+{"t":1790848618546,"conn":"game","dir":"s2c","hex":"5102120000002500f3106c150200","packetId":81}
+{"t":1790848618546,"conn":"game","dir":"s2c","hex":"0e0212000000030002000000","packetId":14}
+{"t":1790848618619,"conn":"game","dir":"c2s","hex":"03cf104315","packetId":3}
+{"t":1790848619125,"conn":"game","dir":"c2s","hex":"03ce104515","packetId":3}
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+{"t":1790848619266,"conn":"game","dir":"s2c","hex":"8f0000000000000000000000000000000000000000000000000000000000000000","packetId":143}
+{"t":1790848619306,"conn":"game","dir":"s2c","hex":"8a0107000000","packetId":138}
+{"t":1790848619306,"conn":"game","dir":"s2c","hex":"670700000001d3103b150100074b0005","packetId":103}
+{"t":1790848619439,"conn":"game","dir":"c2s","hex":"03cc104815","packetId":3}
+{"t":1790848619945,"conn":"game","dir":"c2s","hex":"03ca104a15","packetId":3}
+{"t":1790848619945,"conn":"game","dir":"s2c","hex":"8a0107000000","packetId":138}
+{"t":1790848619945,"conn":"game","dir":"s2c","hex":"670700000001d1103d150100074b0005","packetId":103}
+{"t":1790848620342,"conn":"game","dir":"c2s","hex":"03c9104d15","packetId":3}
+{"t":1790848620786,"conn":"game","dir":"s2c","hex":"6d07000000d1103d1580","packetId":109}
+{"t":1790848620786,"conn":"game","dir":"s2c","hex":"965c806488a60a0000","packetId":150}
+{"t":1790848620786,"conn":"game","dir":"c2s","hex":"03c7104f15","packetId":3}
+{"t":1790848621183,"conn":"game","dir":"c2s","hex":"03c5105215","packetId":3}
+{"t":1790848621465,"conn":"game","dir":"s2c","hex":"670700000001db1038150100074b0005","packetId":103}
+{"t":1790848621689,"conn":"game","dir":"c2s","hex":"03c4105415","packetId":3}
+{"t":1790848622004,"conn":"game","dir":"c2s","hex":"03c2105715","packetId":3}
+{"t":1790848622510,"conn":"game","dir":"c2s","hex":"03c1105915","packetId":3}
+{"t":1790848622826,"conn":"game","dir":"c2s","hex":"03bf105c15","packetId":3}
+{"t":1790848623332,"conn":"game","dir":"c2s","hex":"03bd105e15","packetId":3}
+{"t":1790848623729,"conn":"game","dir":"c2s","hex":"03bc106115","packetId":3}
+{"t":1790848624174,"conn":"game","dir":"c2s","hex":"03ba106315","packetId":3}
+{"t":1790848624187,"conn":"game","dir":"c2s","hex":"6d3b66e5f60000000000000000","packetId":109}
+{"t":1790848624305,"conn":"game","dir":"s2c","hex":"8f0000000000000000000000000000000000000000000000000000000000000000","packetId":143}
+{"t":1790848624306,"conn":"game","dir":"s2c","hex":"965c005e88b08a807f","packetId":150}
+{"t":1790848624572,"conn":"game","dir":"c2s","hex":"130100000004000000","packetId":19}
+{"t":1790848624626,"conn":"game","dir":"s2c","hex":"6d07000000db10381580","packetId":109}
+{"t":1790848624666,"conn":"game","dir":"s2c","hex":"270104000000010000002d0000000000000000000000000000000000000000000000000000000000","packetId":39}
+{"t":1790848624666,"conn":"game","dir":"s2c","hex":"29000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000","packetId":41}
+{"t":1790848624666,"conn":"game","dir":"s2c","hex":"28010400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000","packetId":40}
+{"t":1790848624666,"conn":"game","dir":"s2c","hex":"6d04000000ba10631580","packetId":109}
+{"t":1790848625226,"conn":"game","dir":"s2c","hex":"670300000001e9103b150100074b0005","packetId":103}
+{"t":1790848625266,"conn":"game","dir":"s2c","hex":"6d04000000ba10631580","packetId":109}
+{"t":1790848625273,"conn":"game","dir":"c2s","hex":"2f0100000004000000","packetId":47}
+{"t":1790848625906,"conn":"game","dir":"s2c","hex":"6d04000000ba10631580","packetId":109}
+{"t":1790848625975,"conn":"game","dir":"c2s","hex":"38020000000400000000000000","packetId":56}
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+{"t":1790848626066,"conn":"game","dir":"s2c","hex":"9c0b14100900000000208002650000c276c60602","packetId":156}
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+{"t":1790848626067,"conn":"game","dir":"s2c","hex":"9c0b14050c000000002080026500c0b246270702","packetId":156}
+{"t":1790848626067,"conn":"game","dir":"s2c","hex":"9c0b14050d000000002080026500828216860702","packetId":156}
+{"t":1790848626067,"conn":"game","dir":"s2c","hex":"9c0b14060e000000002080026500e23227760702","packetId":156}
+{"t":1790848626067,"conn":"game","dir":"s2c","hex":"9c0b14050f00000000208002650004b246270702","packetId":156}
+{"t":1790848626067,"conn":"game","dir":"s2c","hex":"9c0b140510000000002080026500643237470602","packetId":156}
+{"t":1790848626067,"conn":"game","dir":"s2c","hex":"9c0b1400110000000020800265000632b7060702","packetId":156}
+{"t":1790848626067,"conn":"game","dir":"s2c","hex":"9c0b1407120000000020800265004632d7c60602","packetId":156}
+{"t":1790848626067,"conn":"game","dir":"s2c","hex":"9c0b140113000000002080026500861257970602","packetId":156}
+{"t":1790848626067,"conn":"game","dir":"s2c","hex":"9c0b140514000000002080026500e6b246270702","packetId":156}
+{"t":1790848626466,"conn":"game","dir":"s2c","hex":"6d04000000ba10631580","packetId":109}
+{"t":1790848627277,"conn":"game","dir":"c2s","hex":"3204000000070000000200000001000000","packetId":50}
+{"t":1790848627345,"conn":"game","dir":"s2c","hex":"2a000c00020000ffffffff02000000","packetId":42}
+{"t":1790848627978,"conn":"game","dir":"c2s","hex":"300100000004000000","packetId":48}
+{"t":1790848628826,"conn":"game","dir":"s2c","hex":"6d03000000e9103b1580","packetId":109}
+{"t":1790848629187,"conn":"game","dir":"c2s","hex":"6dc379e5f60000000000000000","packetId":109}
+{"t":1790848629266,"conn":"game","dir":"s2c","hex":"8f0000000000000000000000000000000000000000000000000000000000000000","packetId":143}
+{"t":1790848629782,"conn":"game","dir":"c2s","hex":"69","packetId":105}

tests/ground-items-drop.test.ts

@@ -235,21 +235,7 @@ describe('Issue #388 — Ground Item & Drop System Ground Truth', () => {
     })
   })
 
-  describe('4. InventoryPanel Gold Dropping & findFreeGridSlot', () => {
+  describe('4. InventoryPanel findFreeGridSlot', () => {
-    it('InventoryPanel.dropGold deducts gold from player inventory', () => {
-      const panel = new InventoryPanel()
-      panel.gold = 50_000
-
-      const dropped = panel.dropGold(10_000)
-      expect(dropped).toBe(10_000)
-      expect(panel.gold).toBe(40_000)
-
-      // Cannot drop more than available gold
-      const dropExcess = panel.dropGold(100_000)
-      expect(dropExcess).toBe(40_000)
-      expect(panel.gold).toBe(0)
-    })
-
     it('findFreeGridSlot returns first available (col, row) without overlapping existing items', () => {
       const gridItems: GridPlacement[] = [
         {

tests/helpers/vendor-shop-fixture.ts

@@ -0,0 +1,45 @@
+/**
+ * Test fixture: fill a `WorldPanelsHud` store the way `HudModel.syncNpcInteraction` does after the
+ * server streamed `0x9C AddToShop` items, but with items generated offline by the common vendor
+ * generator (D2Game store rolls) so panel/draw tests keep realistic content without a live server.
+ */
+import { VendorSessionManager } from '../../src/common/items/vendor-service.ts'
+import { getEmbeddedDropTables } from '../../src/common/items/embedded-drop-tables.ts'
+import { itemToUiInventoryItem } from '../../src/common/items/item-bridge.ts'
+import { getTownNpcDescriptorByName } from '../../src/common/units/npc-table.ts'
+import { VENDOR_TABS, type WorldPanelsHud } from '../../src/client/ui/world-panels.ts'
+
+export function openGeneratedVendorShop(
+  wp: WorldPanelsHud,
+  npcName: string,
+  mode: 'trade' | 'gamble' = 'trade',
+  cLvl = 85,
+  difficulty: 0 | 1 | 2 = 0,
+  npcId = 1,
+): void {
+  const descriptor = getTownNpcDescriptorByName(npcName)
+  if (!descriptor || descriptor.vendorId === null) {
+    throw new Error(`openGeneratedVendorShop: ${npcName} is not a vendor NPC`)
+  }
+  const tables = getEmbeddedDropTables()
+  const session = new VendorSessionManager(tables)
+  const vendorId = descriptor.vendorId
+  const items: { storePage: number; placement: { item: ReturnType<typeof itemToUiInventoryItem>; col: number; row: number } }[] = []
+  if (mode === 'gamble') {
+    for (const p of session.getOrCreateGambleStore(vendorId, cLvl).getAllItems()) {
+      const buyCost = session.getBuyPrice(p.item, vendorId, difficulty, cLvl, true)
+      const item = itemToUiInventoryItem({ ...p.item, buyCost, isGambleMystery: true } as typeof p.item, tables)
+      items.push({ storePage: 1, placement: { item, col: p.x, row: p.y } })
+    }
+  } else {
+    const store = session.getOrCreateVendorStore(vendorId, difficulty, cLvl)
+    VENDOR_TABS.forEach((tab, idx) => {
+      for (const p of store.tabs[tab.id].getAllItems()) {
+        const buyCost = session.getBuyPrice(p.item, vendorId, difficulty, cLvl, false)
+        const item = itemToUiInventoryItem({ ...p.item, buyCost } as typeof p.item, tables)
+        items.push({ storePage: idx + 1, placement: { item, col: p.x, row: p.y } })
+      }
+    })
+  }
+  wp.setVendorShop({ npcId, descriptor, mode, items })
+}

tests/issue-503-bilingual-parity.test.ts

@@ -43,6 +43,7 @@ import { CharacterSheetPanel } from '../src/client/ui/character-sheet.ts'
 import { InventoryPanel, itemToUiInventoryItem } from '../src/client/ui/inventory.ts'
 import { SkillTreePanel } from '../src/client/ui/skill-tree-panel.ts'
 import { ACT_QUESTS, ACT_WAYPOINTS, WorldPanelsHud } from '../src/client/ui/world-panels.ts'
+import { openGeneratedVendorShop } from './helpers/vendor-shop-fixture.ts'
 import { ControlBarHud } from '../src/client/ui/control-bar.ts'
 import { GlobesHud } from '../src/client/ui/globes.ts'
 import { SkillHotkeysHud } from '../src/client/ui/hotkeys.ts'
@@ -450,7 +451,7 @@ describe('Issue #503: HUD & Panel Rendering in ENG (Zero CJK) and CHI Modes', ()
     expect(textCalls).toContain('剩余技能点')
     expect(textCalls).toContain('角色属性 (A/C)')
     expect(textCalls).toContain('罗格营地')
-    expect(textCalls).toContain('私人储物箱')
+    expect(textCalls).toContain('你的私人儲藏箱') // tbl key 'bank' (CHI)
     expect(textCalls).toContain('赫拉迪克方块 (已合成 0 次)')
 
     expect(textCalls).not.toContain('角色属性 (Character)')
@@ -606,7 +607,7 @@ describe('Issue #503: HUD & Panel Rendering in ENG (Zero CJK) and CHI Modes', ()
     // Also test Charsi vendor inventory across all 4 tabs
     const wpVendor = new WorldPanelsHud()
     wpVendor.lang = 'ENG'
-    wpVendor.openVendorForNpc('Charsi', 'trade', 85, 0)
+    openGeneratedVendorShop(wpVendor, 'Charsi', 'trade', 85, 0)
     for (const tabId of ['armor', 'weapons1', 'weapons2', 'misc'] as const) {
       for (const p of wpVendor.vendorTabPlacements[tabId]) {
         const { ctx, font, textCalls } = createMockCanvasAndFont()

tests/issue-504-exocet-fonts.test.ts

@@ -510,6 +510,7 @@ describe('Diablo II v1.13c Exocet & Formal 436 Fonts (Issue #504)', () => {
     // NPC talking dialog body also uses fontformal12 while header uses font16
     drawnCalls.length = 0
     worldPanels.npcMenu = {
+      npcId: null,
       npcName: 'Akara',
       x: 400,
       y: 260,
@@ -711,6 +712,7 @@ describe('Diablo II v1.13c Exocet & Formal 436 Fonts (Issue #504)', () => {
     } as unknown as D2FontRenderer
 
     worldPanels.npcMenu = {
+      npcId: null,
       npcName: '阿卡拉',
       x: 400,
       y: 260,

tests/item-cost.test.ts

@@ -193,8 +193,8 @@ describe('1.13c Item Transaction & Acquisition Cost Engine (M19-P3)', () => {
     expect(sellHell).toBe(35000)
   })
 
-  it('halves acquisition (SELL) price for Ethereal items and forbids repairing Ethereal items', () => {
+  it('quarters acquisition (SELL) price for Ethereal items (0x6fd798b0) and forbids repairing Ethereal items', () => {
-    const capBase = tables.getBase('plt')! // Plate Mail (below 35k cap so halving is observable)
+    const capBase = tables.getBase('plt')! // Plate Mail (below 35k cap so quartering is observable)
     const normalArmor = createDroppedItem(capBase, 'normal', {
       itemTypes: tables.itemTypes,
       ilvl: 25,

tests/item-to-ui-bridge.test.ts

@@ -8,7 +8,7 @@
  * 3. BodyLoc1/BodyLoc2 Equipment Slots Resolution (allowedSlots) with category inheritance
  * 4. Bilingual naming (nameZh, baseNameZh) and rich tooltip stats formatting
  * 5. Normal and Telekinesis ground item pickup conversion via itemToUiInventoryItem
- * 6. Gold accumulation clamped to PLAYER_GOLD_CAP (2,500,000)
+ * 6. Gold accumulation clamped to the level-based inventory gold limit (getInventoryGoldLimit)
  * 7. Inventory full refusal bounce, audio feedback, and notification retention
  */
 
@@ -23,7 +23,6 @@ import {
 import {
   InventoryPanel,
   resolveItemSpriteRect,
-  PLAYER_GOLD_CAP,
 } from '../src/client/ui/inventory.ts'
 import { BAKED_UI_MANIFEST } from '../src/common/items/baked-ui-meta.ts'
 import { GameEngine } from '../src/server/engine/engine.ts'
@@ -423,7 +422,7 @@ describe('Milestone M11.4 (Issue #407) — Drop Item to UiInventoryItem Bridge &
     })
   })
 
-  describe('6. Gold Accumulation & PLAYER_GOLD_CAP Parity', () => {
+  describe('6. Gold Accumulation & Inventory Gold Limit Parity', () => {
     let mockCanvas: any
     let mockStatus: { textContent: string }
 

tests/monster-drop-e2e.test.ts

@@ -22,7 +22,7 @@
  *    - Authentic allowedSlots resolution and paperdoll equipping
  *
  * 4. Gold Currency Accumulation vs Inventory Full Flippy Bounce:
- *    - Gold currency accumulation clamped to PLAYER_GOLD_CAP (2,500,000)
+ *    - Gold currency accumulation clamped to the level-based inventory gold limit
  *    - Full 10x4 inventory grid refusal, metrics.inventoryRefusals, and parabolic bounce physics
  */
 
@@ -37,7 +37,6 @@ import {
   resolveItemSpriteRect,
   identifyUiItem,
   isUiItemUnidentified,
-  PLAYER_GOLD_CAP,
   type UiInventoryItem,
   type EquipSlotId,
 } from '../src/client/ui/inventory.ts'

tests/netproto/d2gs-codecs-items.test.ts

@@ -144,13 +144,16 @@ describe('D2GS 1.13c extracted tables, Huffman codec, S2C/C2S framing & registry
       { type: 'IdentifyItem', itemId: 107, scrollId: 108 },
       { type: 'NpcInit', target: { unitType: 1, id: 15 } },
       { type: 'NpcCancel', target: { unitType: 1, id: 15 } },
-      { type: 'NpcBuy', npcId: 15, itemId: 200, tab: 0, cost: 50 },
+      { type: 'NpcOpenTrade', npcId: 15 },
-      { type: 'NpcSell', npcId: 15, itemId: 200, tab: 0, cost: 25 },
+      { type: 'NpcOpenGamble', npcId: 15 },
-      { type: 'NpcRepair', npcId: 15, itemId: 0, tab: 0, cost: 0 },
+      { type: 'NpcBuy', npcId: 15, itemId: 200, itemMode: 0, gamble: false, shiftFill: false, cost: 50 },
+      { type: 'NpcSell', npcId: 15, itemId: 200, itemMode: 0, cost: 25 },
+      { type: 'NpcRepairItem', npcId: 15, itemId: 200, itemMode: 1, durability: 3 },
+      { type: 'NpcRepairAll', npcId: 15 },
       { type: 'AddStatPoint', statId: 0, count: 1 },
       { type: 'AddSkillPoint', skillId: 36 },
       { type: 'WaypointGo', waypointId: 30, destAreaId: 1 },
-      { type: 'ClickButton', buttonId: 0, complement: 0 },
+      { type: 'ClickButton', buttonId: 0x12, amount: 0 },
       { type: 'Party', action: 6, targetPlayerId: 2 },
       { type: 'Hostile', targetPlayerId: 2, hostile: true },
       { type: 'Trade', action: 2, gold: 0 },

tests/netproto/vendor-stash-golden.test.ts

@@ -0,0 +1,135 @@
+/**
+ * Byte-level golden tests for NPC vendor / stash gold packets (1.13c).
+ *
+ * Layouts are taken from the disassembly (see each encoder/decoder's doc comment):
+ * - 0x4F ClickButton: D2Game 0x6fcf1470 amount = (WORD[3] << 16) | WORD[5].
+ * - 0x32 / 0x33 / 0x35: D2Client 0x6faf6ee0 / 0x6fb46d5f / 0x6faf7dff, D2Game 0x6fcef220 / 0x6fcef0a0.
+ * - 0x38: D2Game 0x6fce00c0 action 1 = trade, 2 = gamble.
+ * - 0x2A: D2Game 0x6fcaac90 builder; D2Client 0x6fafbc80 reader.
+ */
+
+import { describe, expect, it } from 'vitest'
+import { decode0x2ANpcTransaction } from '../../src/netproto/d2gs/s2c/npc.ts'
+import { encodeD2gsClientCommand } from '../../src/netproto/d2gs/registry.ts'
+import { ClickButtonId } from '../../src/netproto/d2gs/c2s/interact.ts'
+
+const bytes = (cmd: Parameters<typeof encodeD2gsClientCommand>[0]): number[] => {
+  const pkts = encodeD2gsClientCommand(cmd)
+  expect(pkts).toHaveLength(1)
+  return Array.from(pkts[0]!)
+}
+
+describe('C2S 0x4F ClickButton (amount high word first)', () => {
+  it('deposit 0x00012345 gold -> 4F 14 00 | 01 00 | 45 23', () => {
+    expect(bytes({ type: 'ClickButton', buttonId: ClickButtonId.DepositGold, amount: 0x00012345 })).toEqual([
+      0x4f, 0x14, 0x00, 0x01, 0x00, 0x45, 0x23,
+    ])
+  })
+
+  it('withdraw 1 gold -> 4F 13 00 | 00 00 | 01 00', () => {
+    expect(bytes({ type: 'ClickButton', buttonId: ClickButtonId.WithdrawGold, amount: 1 })).toEqual([
+      0x4f, 0x13, 0x00, 0x00, 0x00, 0x01, 0x00,
+    ])
+  })
+
+  it('close stash / transmute carry amount 0', () => {
+    expect(bytes({ type: 'ClickButton', buttonId: ClickButtonId.CloseStash, amount: 0 })).toEqual([
+      0x4f, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00,
+    ])
+    expect(bytes({ type: 'ClickButton', buttonId: ClickButtonId.Transmute, amount: 0 })).toEqual([
+      0x4f, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00,
+    ])
+  })
+
+  it('trade gold reuses the same hi/lo layout (button 0x08)', () => {
+    expect(bytes({ type: 'Trade', action: ClickButtonId.TradeGold, gold: 2_500_000 })).toEqual([
+      // 2_500_000 = 0x002625A0
+      0x4f, 0x08, 0x00, 0x26, 0x00, 0xa0, 0x25,
+    ])
+  })
+
+  it('rejects non-integer / out-of-range amounts', () => {
+    expect(() => bytes({ type: 'ClickButton', buttonId: 0x14, amount: -1 })).toThrow(RangeError)
+    expect(() => bytes({ type: 'ClickButton', buttonId: 0x14, amount: 1.5 })).toThrow(RangeError)
+    expect(() => bytes({ type: 'ClickButton', buttonId: 0x10000, amount: 0 })).toThrow(RangeError)
+  })
+})
+
+describe('C2S 0x38 NpcEntityAction', () => {
+  it('trade = action 1, complement 0', () => {
+    expect(bytes({ type: 'NpcOpenTrade', npcId: 7 })).toEqual([
+      0x38, 0x01, 0, 0, 0, 0x07, 0, 0, 0, 0, 0, 0, 0,
+    ])
+  })
+  it('gamble = action 2, complement 0', () => {
+    expect(bytes({ type: 'NpcOpenGamble', npcId: 0x0102 })).toEqual([
+      0x38, 0x02, 0, 0, 0, 0x02, 0x01, 0, 0, 0, 0, 0, 0,
+    ])
+  })
+})
+
+describe('C2S 0x32 NpcBuy field3', () => {
+  it('plain buy: field3 = itemMode << 16', () => {
+    expect(
+      bytes({ type: 'NpcBuy', npcId: 7, itemId: 0x20, itemMode: 0, gamble: false, shiftFill: false, cost: 25 }),
+    ).toEqual([0x32, 7, 0, 0, 0, 0x20, 0, 0, 0, 0, 0, 0, 0, 25, 0, 0, 0])
+    expect(
+      bytes({ type: 'NpcBuy', npcId: 7, itemId: 0x20, itemMode: 0x0004, gamble: false, shiftFill: false, cost: 25 }),
+    ).toEqual([0x32, 7, 0, 0, 0, 0x20, 0, 0, 0, 0x00, 0x00, 0x04, 0x00, 25, 0, 0, 0])
+  })
+  it('gamble sets bit 1, shift-fill sets bit 31', () => {
+    expect(
+      bytes({ type: 'NpcBuy', npcId: 1, itemId: 2, itemMode: 0, gamble: true, shiftFill: false, cost: 0x1234 }),
+    ).toEqual([0x32, 1, 0, 0, 0, 2, 0, 0, 0, 0x02, 0, 0, 0, 0x34, 0x12, 0, 0])
+    expect(
+      bytes({ type: 'NpcBuy', npcId: 1, itemId: 2, itemMode: 0, gamble: false, shiftFill: true, cost: 1 }),
+    ).toEqual([0x32, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0x80, 1, 0, 0, 0])
+  })
+  it('requires a u16 itemMode and u32 cost', () => {
+    expect(() =>
+      bytes({ type: 'NpcBuy', npcId: 1, itemId: 2, itemMode: 0x10000, gamble: false, shiftFill: false, cost: 1 }),
+    ).toThrow(RangeError)
+    expect(() =>
+      bytes({ type: 'NpcBuy', npcId: 1, itemId: 2, itemMode: 0, gamble: false, shiftFill: false, cost: Number.NaN }),
+    ).toThrow(RangeError)
+  })
+})
+
+describe('C2S 0x33 NpcSell', () => {
+  it('field3 = itemMode', () => {
+    expect(bytes({ type: 'NpcSell', npcId: 7, itemId: 0x31, itemMode: 0, cost: 12 })).toEqual([
+      0x33, 7, 0, 0, 0, 0x31, 0, 0, 0, 0, 0, 0, 0, 12, 0, 0, 0,
+    ])
+  })
+})
+
+describe('C2S 0x35 Repair', () => {
+  it('single item: itemId, itemMode, current durability (never the repair-all bit)', () => {
+    expect(bytes({ type: 'NpcRepairItem', npcId: 7, itemId: 0x40, itemMode: 1, durability: 13 })).toEqual([
+      0x35, 7, 0, 0, 0, 0x40, 0, 0, 0, 1, 0, 0, 0, 13, 0, 0, 0,
+    ])
+    expect(() =>
+      bytes({ type: 'NpcRepairItem', npcId: 7, itemId: 0x40, itemMode: 1, durability: 0x80000000 }),
+    ).toThrow(RangeError)
+  })
+  it('repair all: itemId 0, field3 0, field4 0x80000000', () => {
+    expect(bytes({ type: 'NpcRepairAll', npcId: 7 })).toEqual([
+      0x35, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x80,
+    ])
+  })
+})
+
+describe('S2C 0x2A NPCTransaction', () => {
+  it('decodes flag@1, result@2, itemId@7, gold@11 and ignores the uninitialised bytes 3..6', () => {
+    const pkt = new Uint8Array([
+      0x2a, 0x01, 0x02, 0xde, 0xad, 0xbe, 0xef, 0xff, 0xff, 0xff, 0xff, 0x39, 0x30, 0x00, 0x00,
+    ])
+    expect(decode0x2ANpcTransaction(pkt)).toEqual({
+      type: 'NpcTransaction',
+      result: 2,
+      flag: 1,
+      itemId: 0xffffffff,
+      gold: 12345,
+    })
+  })
+})

tests/stash.test.ts

@@ -12,7 +12,6 @@ import {
   STASH_PANEL_ORIGIN,
   STASH_GRID_ORIGIN,
   STASH_GOLD_CAP,
-  PLAYER_GOLD_CAP,
   STASH_HEADER_ICON_SOCKET,
   STASH_HEADER_TOP_RECESS,
   STASH_HEADER_BOTTOM_RECESS,
@@ -359,68 +358,13 @@ describe('Milestone M5 (Issue #150): Camp Town Stash Entities Across 5 Acts & 6x
     })
   })
 
-  describe('5. Gold Deposit and Withdrawal with Caps', () => {
+  describe('5. Stash Gold Cap (server-driven transfers)', () => {
-    let panels: WorldPanelsHud
+    it('exposes STASH_GOLD_CAP = 2,500,000 (D2Common #11060) and performs no local gold mutation', () => {
-    let inv: InventoryPanel
-
-    beforeEach(() => {
-      panels = new WorldPanelsHud()
-      inv = new InventoryPanel()
-      inv.gold = 500_000
-      panels.stashGold = 100_000
-    })
-
-    it('deposits gold from inventory into stash up to capacity', () => {
-      const deposited = panels.depositGold(50_000, inv)
-      expect(deposited).toBe(50_000)
-      expect(inv.gold).toBe(450_000)
-      expect(panels.stashGold).toBe(150_000)
-    })
-
-    it('withdraws gold from stash into inventory up to player capacity', () => {
-      const withdrawn = panels.withdrawGold(40_000, inv)
-      expect(withdrawn).toBe(40_000)
-      expect(inv.gold).toBe(540_000)
-      expect(panels.stashGold).toBe(60_000)
-    })
-
-    it('respects STASH_GOLD_CAP (2,500,000) and clamps deposit amounts', () => {
       expect(STASH_GOLD_CAP).toBe(2_500_000)
-      panels.stashGold = 2_490_000
+      const panels = new WorldPanelsHud()
-      inv.gold = 100_000
+      // Deposit/withdraw are ClickButton commands sent by HudModel; D2Game owns the balances.
-
+      expect((panels as unknown as Record<string, unknown>)['depositGold']).toBeUndefined()
-      const deposited = panels.depositGold(50_000, inv)
+      expect((panels as unknown as Record<string, unknown>)['withdrawGold']).toBeUndefined()
-      expect(deposited).toBe(10_000)
-      expect(panels.stashGold).toBe(2_500_000)
-      expect(inv.gold).toBe(90_000)
-
-      // Further deposits do nothing
-      expect(panels.depositGold(10_000, inv)).toBe(0)
-      expect(panels.stashGold).toBe(2_500_000)
-    })
-
-    it('respects PLAYER_GOLD_CAP (2,500,000) and clamps withdrawal amounts', () => {
-      expect(PLAYER_GOLD_CAP).toBe(2_500_000)
-      panels.stashGold = 500_000
-      inv.gold = 2_480_000
-
-      const withdrawn = panels.withdrawGold(50_000, inv)
-      expect(withdrawn).toBe(20_000)
-      expect(inv.gold).toBe(2_500_000)
-      expect(panels.stashGold).toBe(480_000)
-
-      // Further withdrawals do nothing
-      expect(panels.withdrawGold(10_000, inv)).toBe(0)
-      expect(inv.gold).toBe(2_500_000)
-    })
-
-    it('handles zero or negative transfers safely', () => {
-      expect(panels.depositGold(0, inv)).toBe(0)
-      expect(panels.depositGold(-500, inv)).toBe(0)
-      expect(panels.withdrawGold(0, inv)).toBe(0)
-      expect(panels.withdrawGold(-500, inv)).toBe(0)
-      expect(inv.gold).toBe(500_000)
-      expect(panels.stashGold).toBe(100_000)
     })
   })
 
@@ -548,8 +492,8 @@ describe('Milestone M5 (Issue #150): Camp Town Stash Entities Across 5 Acts & 6x
         mockFont,
       )
 
-      const titleCall = drawTextCalls.find(c => c.text.includes('私人储物箱'))
+      const titleCall = drawTextCalls.find(c => c.text.includes('你的私人儲藏箱')) // tbl 'bank'
-      const goldCall = drawTextCalls.find(c => c.text.includes('储物箱金币'))
+      const goldCall = drawTextCalls.find(c => c.text.includes('儲藏起來的金錢：')) // tbl 'strGoldInStash'
 
       expect(titleCall).toBeDefined()
       expect(goldCall).toBeDefined()

tests/transaction-cost-113c.test.ts

@@ -0,0 +1,307 @@
+/**
+ * D2Common 1.13c #10107 / #10071 pricing port. Every expectation below was
+ * worked out by hand from the canonical table values given in the comments,
+ * following the asm branches cited in `src/common/items/transaction-cost.ts`.
+ *
+ * Npc.txt (normal difficulty):
+ *   akara  sell mult 1024, buy mult 512, rep mult 128, questflag A 4,
+ *          questsellmult A 922, questbuymult A 1024, max buy 5000
+ *   charsi sell mult  960, buy mult 512, rep mult 128, max buy 5000
+ */
+import { describe, expect, it } from 'vitest'
+import {
+  computeRepairAllCost113c,
+  computeTransactionCost113c,
+  fogMulDiv113c,
+  getCanonicalTransactionCostTables,
+  getNpcClassByName113c,
+  isItemRepairable113c,
+  type TransactionCostContext,
+  type TransactionCostInput,
+  type TransactionCostStat,
+} from '../src/common/items/transaction-cost.ts'
+
+const tables = getCanonicalTransactionCostTables()
+const AKARA = getNpcClassByName113c(tables, 'akara')
+const CHARSI = getNpcClassByName113c(tables, 'charsi')
+
+function ctx(npcClass: number, over: Partial<TransactionCostContext> = {}): TransactionCostContext {
+  return {
+    playerLevel: 1,
+    playerReducedPricesPct: 0,
+    difficulty: 0,
+    npcClass,
+    isQuestFlagSet: () => false,
+    tables,
+    ...over,
+  }
+}
+
+function stat(statId: number, value: number, base = value, param = 0): TransactionCostStat {
+  return { statId, param, value, base }
+}
+
+function item(code: string, over: Partial<TransactionCostInput> = {}): TransactionCostInput {
+  return {
+    code,
+    itemFormat: 101,
+    quality: 2,
+    identified: true,
+    ethereal: false,
+    starterItem: false,
+    isEar: false,
+    stats: [],
+    socketedChildCodes: [],
+    ...over,
+  }
+}
+
+const buy = (i: TransactionCostInput, c: TransactionCostContext): number => computeTransactionCost113c(i, c, 0)
+const sell = (i: TransactionCostInput, c: TransactionCostContext): number => computeTransactionCost113c(i, c, 1)
+const gamble = (i: TransactionCostInput, c: TransactionCostContext): number => computeTransactionCost113c(i, c, 2)
+const repair = (i: TransactionCostInput, c: TransactionCostContext): number => computeTransactionCost113c(i, c, 3)
+
+describe('compiled tables', () => {
+  it('maps Npc.txt rows onto MonStats hcIdx with "Expansion" rows skipped', () => {
+    expect(AKARA).toBe(148)
+    expect(CHARSI).toBe(154)
+    expect(getNpcClassByName113c(tables, 'gheed')).toBe(147)
+    // raw MonStats row 512, after the Expansion row at raw 410
+    expect(getNpcClassByName113c(tables, 'larzuk')).toBe(511)
+  })
+
+  it('indexes affixes by compiled row, packet id = row + 1', () => {
+    expect(tables.magicPrefixes[1]).toEqual({ name: 'Sturdy', multiply: 0, add: 0 })
+    expect(tables.magicPrefixes[7]).toEqual({ name: 'Devious', multiply: 0, add: 0 })
+    // raw row 317, after the Expansion row at raw 118
+    expect(tables.magicPrefixes[316]).toEqual({ name: 'Shimmering', multiply: 1280, add: 500 })
+    expect(tables.magicSuffixes[0]).toEqual({ name: 'of Health', multiply: 0, add: 0 })
+  })
+
+  it('resolves every normcode/ubercode/ultracode a gamble can reach', () => {
+    for (const rec of tables.items.values()) {
+      expect(() => gamble(item(rec.code), ctx(AKARA, { playerLevel: 50 }))).not.toThrow()
+    }
+  })
+})
+
+describe('#10107 buy / sell', () => {
+  it('hp1 at Akara: cost 30', () => {
+    // A = B = C = 30. Buy: 30*1024/1024 = 30. Sell: 30*512/1024 = 15.
+    expect(buy(item('hp1'), ctx(AKARA))).toBe(30)
+    expect(sell(item('hp1'), ctx(AKARA))).toBe(15)
+  })
+
+  it('applies the Akara quest discount when quest 4 state 0 or 1 is set', () => {
+    const c = ctx(AKARA, { isQuestFlagSet: (q, s) => q === 4 && s === 0 })
+    // Buy: 30 * questsellmult 922 / 1024 = 27.01 -> 27. Sell: 15 * questbuymult 1024 / 1024 = 15.
+    expect(buy(item('hp1'), c)).toBe(27)
+    expect(sell(item('hp1'), c)).toBe(15)
+  })
+
+  it('tsc at Akara: cost 100', () => {
+    expect(buy(item('tsc'), ctx(AKARA))).toBe(100)
+    expect(sell(item('tsc'), ctx(AKARA))).toBe(50)
+  })
+
+  it('ssd at Charsi: cost 72', () => {
+    const ssd = item('ssd', { stats: [stat(72, 24), stat(73, 24)] })
+    // Buy: 72*960/1024 = 67.5 -> 67. Sell: 72*512/1024 = 36.
+    expect(buy(ssd, ctx(CHARSI))).toBe(67)
+    expect(sell(ssd, ctx(CHARSI))).toBe(36)
+  })
+
+  it('buc at Charsi scales by base defense: cost 68, maxac 6, base AC 5', () => {
+    const buc = item('buc', { stats: [stat(31, 5), stat(72, 12), stat(73, 12)] })
+    // A = B = C = 68*5/6 = 56. Buy: 56*960/1024 = 52.5 -> 52. Sell: 56*512/1024 = 28.
+    expect(buy(buc, ctx(CHARSI))).toBe(52)
+    expect(sell(buc, ctx(CHARSI))).toBe(28)
+  })
+
+  it('magic buc with prefix Devious (id 8) + suffix of Health (id 1)', () => {
+    // Both affixes have multiply 0 / add 0, so their terms are 0. Bonus stats (full - base):
+    //   34 normal_damage_reduction +1: Add 188, Multiply 200 -> 200*56*1/1024 = 10 + 188 = 198
+    //   35 magic_damage_reduction  +1: Add 397, Multiply 340 -> 340*56*1/1024 = 18 + 397 = 415
+    // A = B = 56 + 198 + 415 = 669. Buy: 669*960/1024 = 627.2 -> 627. Sell: 669*512/1024 = 334.
+    const buc = item('buc', {
+      quality: 4,
+      magicPrefixId: 8,
+      magicSuffixId: 1,
+      stats: [stat(31, 5), stat(72, 12), stat(73, 12), stat(34, 1, 0), stat(35, 1, 0)],
+    })
+    expect(buy(buc, ctx(CHARSI))).toBe(627)
+    expect(sell(buc, ctx(CHARSI))).toBe(334)
+  })
+
+  it('magic ring with Shimmering (id 317: multiply 1280, add 500)', () => {
+    // rin cost 1800. Term: 1280*1800/1024 + 500 = 2250 + 500 = 2750, so A = B = 4550.
+    // Akara buy 4550; sell 4550*512/1024 = 2275.
+    const rin = item('rin', { quality: 4, magicPrefixId: 317, magicSuffixId: 0 })
+    expect(buy(rin, ctx(AKARA))).toBe(4550)
+    expect(sell(rin, ctx(AKARA))).toBe(2275)
+  })
+
+  it('wand with +3 Teeth StaffMods (skill 67: costMult 256, costAdd 1000)', () => {
+    // wnd cost 205, factor 2*3-1 = 5.
+    //   A += (256*205/1024 + 1000)*5 = (51 + 1000)*5 = 5255 -> 5460
+    //   B += (205*256/4096 + 1000)*5 = (12 + 1000)*5 = 5060 -> 5265
+    // Akara buy 5460; sell 5265*512/1024 = 2632.
+    const wnd = item('wnd', { stats: [stat(107, 3, 3, 67), stat(72, 15), stat(73, 15)] })
+    expect(buy(wnd, ctx(AKARA))).toBe(5460)
+    expect(sell(wnd, ctx(AKARA))).toBe(2632)
+  })
+
+  it('arrows (quiver): aqv cost 256, maxstack 350', () => {
+    // 350 arrows: A = B = 256*350/1024 = 87. Charsi buy 87*960/1024 = 81; sell 87*512/1024 = 43.
+    expect(buy(item('aqv', { stats: [stat(70, 350)] }), ctx(CHARSI))).toBe(81)
+    expect(sell(item('aqv', { stats: [stat(70, 350)] }), ctx(CHARSI))).toBe(43)
+    // 100 arrows: A = B = 25600/1024 = 25. Buy 25*960/1024 = 23; sell 12.
+    expect(buy(item('aqv', { stats: [stat(70, 100)] }), ctx(CHARSI))).toBe(23)
+    expect(sell(item('aqv', { stats: [stat(70, 100)] }), ctx(CHARSI))).toBe(12)
+  })
+
+  it('stackable throwing weapon: tkf cost 6, maxstack 160, quantity 100', () => {
+    // A = B = C = 6, D = 160. Npc: A = 6*960/1024 = 5; B = 6*512/1024 = 3; C = 6*128/1024 = 0.
+    // Quantity: buy = 5*100 = 500. Sell = 160*3 - 0*(160-100) = 480 (full-stack value minus refill).
+    // Repair: throwable, so C stays 6 -> 0 after rep mult -> clamped to 1.
+    const tkf = item('tkf', { stats: [stat(70, 100), stat(72, 4), stat(73, 4)] })
+    expect(buy(tkf, ctx(CHARSI))).toBe(500)
+    expect(sell(tkf, ctx(CHARSI))).toBe(480)
+    expect(repair(tkf, ctx(CHARSI))).toBe(1)
+  })
+
+  it('Town Portal tome prices by charges: Books row 0 CostPerCharge 50, tbk cost 250', () => {
+    // 3 charges: 50*3 + 250 = 400 -> Akara buy 400, sell 200.
+    expect(buy(item('tbk', { bookId: 0, stats: [stat(70, 3)] }), ctx(AKARA))).toBe(400)
+    expect(sell(item('tbk', { bookId: 0, stats: [stat(70, 3)] }), ctx(AKARA))).toBe(200)
+    // 20 charges: 50*20 + 250 = 1250 -> buy 1250, sell 625.
+    expect(buy(item('tbk', { bookId: 0, stats: [stat(70, 20)] }), ctx(AKARA))).toBe(1250)
+    expect(sell(item('tbk', { bookId: 0, stats: [stat(70, 20)] }), ctx(AKARA))).toBe(625)
+  })
+
+  it('throws when a book has no Books.txt id', () => {
+    expect(() => buy(item('tbk', { stats: [stat(70, 3)] }), ctx(AKARA))).toThrow(/bookId/)
+  })
+
+  it('starter items cost 1 for every transaction type', () => {
+    const hax = item('hax', { starterItem: true, stats: [stat(72, 28), stat(73, 28)] })
+    expect(buy(hax, ctx(CHARSI))).toBe(1)
+    expect(sell(hax, ctx(CHARSI))).toBe(1)
+    expect(repair(hax, ctx(CHARSI))).toBe(1)
+    expect(gamble(hax, ctx(CHARSI))).toBe(1)
+  })
+
+  it('quarters the sell price of ethereal items (buy unchanged)', () => {
+    const ssd = item('ssd', { ethereal: true, stats: [stat(72, 24), stat(73, 24)] })
+    // B = 72/4 = 18 -> 18*512/1024 = 9. Buy stays 67.
+    expect(buy(ssd, ctx(CHARSI))).toBe(67)
+    expect(sell(ssd, ctx(CHARSI))).toBe(9)
+    expect(repair(ssd, ctx(CHARSI))).toBe(0) // ethereal items are not repairable
+  })
+
+  it('quarters the sell price of class-specific items: am1 (abow, Class=ama) cost 2500', () => {
+    const am1 = item('am1', { stats: [stat(72, 40), stat(73, 40)] })
+    // B = 2500/4 = 625 -> 625*512/1024 = 312. Buy 2500.
+    expect(buy(am1, ctx(AKARA))).toBe(2500)
+    expect(sell(am1, ctx(AKARA))).toBe(312)
+  })
+
+  it('caps the sell price at Npc.txt max buy', () => {
+    const rin = item('rin', { quality: 4, magicPrefixId: 327 - 0, magicSuffixId: 0 })
+    // Chromatic (raw 327 -> compiled 326 -> id 327): multiply 1280, add 16000.
+    // A = 1800 + 1800*1280/1024 + 16000 = 1800 + 2250 + 16000 = 20050 -> sell 10025 -> capped 5000.
+    expect(tables.magicPrefixes[326]).toEqual({ name: 'Chromatic', multiply: 1280, add: 16000 })
+    expect(sell(rin, ctx(AKARA))).toBe(5000)
+    expect(sell(rin, ctx(AKARA, { difficulty: 1 }))).toBe(10025)
+  })
+})
+
+describe('#10107 repair', () => {
+  it('repairs a half-damaged ssd at Charsi: (24-12)*72/24 = 36 -> 36*128/1024 = 4', () => {
+    expect(repair(item('ssd', { stats: [stat(72, 12, 12), stat(73, 24)] }), ctx(CHARSI))).toBe(4)
+  })
+
+  it('charges the minimum 1 for a repairable item at full durability', () => {
+    const ssd = item('ssd', { stats: [stat(72, 24), stat(73, 24)] })
+    expect(isItemRepairable113c(ssd, tables)).toBe(true)
+    expect(repair(ssd, ctx(CHARSI))).toBe(1)
+  })
+
+  it('returns 0 for unrepairable items', () => {
+    expect(repair(item('hp1'), ctx(AKARA))).toBe(0)
+    expect(repair(item('ssd', { identified: false, stats: [stat(72, 1), stat(73, 24)] }), ctx(CHARSI))).toBe(0)
+  })
+
+  it('applies reduced prices with the 99% cap', () => {
+    // qui base AC 10 (maxac 11): C = 140*10/11 = 127; repair (20-10)*127/20 = 63 -> 63*128/1024 = 7.
+    const qui = item('qui', { stats: [stat(31, 10), stat(72, 10, 10), stat(73, 20)] })
+    expect(repair(qui, ctx(CHARSI))).toBe(7)
+    // 50%: 7 - 7*50/100 = 7 - 3 = 4
+    expect(repair(qui, ctx(CHARSI, { playerReducedPricesPct: 50 }))).toBe(4)
+    // 150% is capped to 99: 7 - 6 = 1
+    expect(repair(qui, ctx(CHARSI, { playerReducedPricesPct: 150 }))).toBe(1)
+  })
+})
+
+describe('#10107 gamble', () => {
+  it('rings and amulets use their gamble cost (rin 50000, amu 63000)', () => {
+    expect(gamble(item('rin'), ctx(AKARA, { playerLevel: 30 }))).toBe(50000)
+    expect(gamble(item('amu'), ctx(AKARA, { playerLevel: 30 }))).toBe(63000)
+    // 30% reduced prices: 50000 - 15000 = 35000; 63000 - 18900 = 44100.
+    expect(gamble(item('rin'), ctx(AKARA, { playerLevel: 30, playerReducedPricesPct: 30 }))).toBe(35000)
+    expect(gamble(item('amu'), ctx(AKARA, { playerLevel: 30, playerReducedPricesPct: 30 }))).toBe(44100)
+  })
+
+  it('armor bases follow the clvl formula: qui cost 140 qlvl 1; xui lvl 34 cost 30552; uui lvl 65', () => {
+    // clvl 1: uber/ultra weights 0; s = 140; L = 5; t = 5*250/3 = 416; f = 11/3 + 20 = 23
+    //         (416 + 140)*23/15 = 852
+    expect(gamble(item('qui'), ctx(AKARA, { playerLevel: 1 }))).toBe(852)
+    // clvl 30: weights still 0; L = 30; t = 2500; f = 61/3 + 20 = 40; (2500 + 140)*40/15 = 7040
+    expect(gamble(item('qui'), ctx(AKARA, { playerLevel: 30 }))).toBe(7040)
+    // clvl 40: uberW = (40-34)*100/2 + 1 = 301; s = ((10000-301)*140 + 30552*301)/10000 = 1055
+    //          t = 40*250/3 = 3333; f = 81/3 + 20 = 47; (3333 + 1055)*47/15 = 13749
+    expect(gamble(item('qui'), ctx(AKARA, { playerLevel: 40 }))).toBe(13749)
+  })
+
+  it('uses the ItemsTxt gamble cost for itemFormat 0', () => {
+    expect(gamble(item('qui', { itemFormat: 0 }), ctx(AKARA, { playerLevel: 40 }))).toBe(3035)
+  })
+})
+
+describe('#10071 repair all', () => {
+  it('sums the repair cost of equipped items that need it', () => {
+    const slots: (TransactionCostInput | null)[] = Array.from({ length: 13 }, () => null)
+    slots[4] = item('ssd', { stats: [stat(72, 12, 12), stat(73, 24)] }) // 4
+    slots[3] = item('qui', { stats: [stat(31, 10), stat(72, 10, 10), stat(73, 20)] }) // 7
+    slots[5] = item('buc', { stats: [stat(31, 5), stat(72, 12), stat(73, 12)] }) // full: skipped (not 1)
+    expect(computeRepairAllCost113c(slots, ctx(CHARSI))).toBe(11)
+  })
+
+  it('requires exactly 13 slots', () => {
+    expect(() => computeRepairAllCost113c([], ctx(CHARSI))).toThrow(/13/)
+  })
+})
+
+describe('fail-fast', () => {
+  it('throws on unknown codes and NPCs', () => {
+    expect(() => buy(item('zzz'), ctx(AKARA))).toThrow(/zzz/)
+    expect(() => buy(item('hp1'), ctx(-1))).toThrow(/Npc/)
+    expect(() => buy(item('rin', { quality: 4, magicPrefixId: 9999, magicSuffixId: 0 }), ctx(AKARA))).toThrow(/outside/)
+  })
+
+  it('fogMulDiv picks the int64 path for large values', () => {
+    expect(fogMulDiv113c(30, 50000, 100)).toBe(15000)
+    expect(fogMulDiv113c(50, 3_000_000, 100)).toBe(1_500_000)
+  })
+})
+
+describe('live capture cross-check (tests/fixtures/netproto/06-d2gs-vendor-buy-sell.d2cap)', () => {
+  // WebBotThree sold its starter tsc and isc: each 0x2A result 1 flag 3 carried stat 14 one higher
+  // (2 gold after both sales, from 0). Starter branch 0x6fd78ecd.
+  it('starter scrolls sell for exactly 1 gold', () => {
+    for (const npc of [AKARA, CHARSI]) {
+      expect(sell(item('tsc', { starterItem: true }), ctx(npc))).toBe(1)
+      expect(sell(item('isc', { starterItem: true }), ctx(npc))).toBe(1)
+    }
+  })
+})

tests/ui-hud.test.ts

@@ -1064,16 +1064,16 @@ describe('Diablo II v1.13c UI / HUD (Issue #27)', () => {
     expect(goldTextCall!.y - 7).toBeGreaterThanOrEqual(INV_GOLD_BOX_RECESS.y)
     expect(goldTextCall!.y + 1).toBeLessThanOrEqual(INV_GOLD_BOX_RECESS.y + INV_GOLD_BOX_RECESS.h - 1)
 
-    // 4. Verify clicking directly on the Gold Coin Button (490, 460) triggers onDropGold
+    // 4. Verify clicking directly on the Gold Coin Button (490, 460) asks for the gold dialog (no local drop)
-    let droppedGold = 0
+    let goldButtonPresses = 0
     expect(
       inv.handleClick(490, 460, {
-        onDropGold: amt => {
+        onGoldButton: () => {
-          droppedGold = amt
+          goldButtonPresses++
         },
       }),
     ).toBe(true)
-    expect(droppedGold).toBe(10_000)
+    expect(goldButtonPresses).toBe(1)
 
     // 5. Verify D2FontRenderer.drawText uses lining-numeral serif stack (never old-style Georgia)
     const fontRenderer = new D2FontRenderer()

tests/unidentified-drops-identify.test.ts

@@ -385,47 +385,5 @@ describe('Diablo II v1.13c Unidentified Equipment Drops & Identification System'
       expect(tomeItem.quantity).toBe(4)
       expect(inv.gridItems.some(p => p.item.id === tomeItem.id)).toBe(true)
     })
-
-    it('identifies all unidentified items across Inventory, Stash, and Horadric Cube via Deckard Cain', () => {
-      const inv = new InventoryPanel()
-      const wp = new WorldPanelsHud()
-      const rinBase = dropTables.getBase('rin')!
-      const amuBase = dropTables.getBase('amu')!
-
-      const bagUnid = itemToUiInventoryItem(makeDroppedShako('unique', 51), dropTables)
-      const stashUnid = itemToUiInventoryItem(
-        createDroppedItem(rinBase, 'rare', {
-          itemTypes: dropTables.itemTypes,
-          ilvl: 60,
-          dwInitSeed: 52,
-          itemRng: new D2Rng(52),
-        }),
-        dropTables,
-      )
-      const cubeUnid = itemToUiInventoryItem(
-        createDroppedItem(amuBase, 'magic', {
-          itemTypes: dropTables.itemTypes,
-          ilvl: 50,
-          dwInitSeed: 53,
-          itemRng: new D2Rng(53),
-        }),
-        dropTables,
-      )
-
-      inv.gridItems = [{ item: bagUnid, col: 0, row: 0 }]
-      wp.stashItems = [{ item: stashUnid, col: 0, row: 0 }]
-      wp.cubeItems = [{ item: cubeUnid, col: 0, row: 0 }]
-
-      expect(isUiItemUnidentified(bagUnid)).toBe(true)
-      expect(isUiItemUnidentified(stashUnid)).toBe(true)
-      expect(isUiItemUnidentified(cubeUnid)).toBe(true)
-
-      const count = wp.identifyAllUiItems(inv)
-      expect(count).toBe(3)
-      expect(isUiItemUnidentified(bagUnid)).toBe(false)
-      expect(isUiItemUnidentified(stashUnid)).toBe(false)
-      expect(isUiItemUnidentified(cubeUnid)).toBe(false)
-      expect(wp.identifyAllUiItems(inv)).toBe(0)
-    })
   })
 })

tests/vendor-panel-ui.test.ts

@@ -33,6 +33,7 @@ import {
   hitTestNpcDialogOption,
   resolveVendorButtonLayout,
 } from '../src/client/ui/world-panels.ts'
+import { openGeneratedVendorShop } from './helpers/vendor-shop-fixture.ts'
 
 function readPngHeaderSize(buf: Uint8Array): { width: number; height: number } {
   const view = new DataView(buf.buffer, buf.byteOffset, buf.byteLength)
@@ -287,7 +288,7 @@ describe('Diablo II 1.13c Vendor / BuySell Panel UI Parity', () => {
     const wp = new WorldPanelsHud()
     const inv = new InventoryPanel()
     wp.activePlayerInventory = inv
-    expect(wp.openVendorForNpc('Charsi', 'trade', 24, 0)).toBe(true)
+    openGeneratedVendorShop(wp, 'Charsi', 'trade', 24, 0)
 
     const { ctx, font, drawImageCalls, strokeRectCalls, fontCalls } = createMockCanvasAndFont()
     const assets = { ...createFakeVendorAssets(), inventory: inv }
@@ -326,7 +327,7 @@ describe('Diablo II 1.13c Vendor / BuySell Panel UI Parity', () => {
     const wp = new WorldPanelsHud()
     const inv = new InventoryPanel()
     wp.activePlayerInventory = inv
-    expect(wp.openVendorForNpc('Akara', 'trade', 12, 0)).toBe(true)
+    openGeneratedVendorShop(wp, 'Akara', 'trade', 12, 0)
 
     // Force armor tab empty to verify 0x6fb45e5e-0x6fb45f5d tab presence guard
     wp.vendorTabPlacements.armor = []
@@ -349,7 +350,7 @@ describe('Diablo II 1.13c Vendor / BuySell Panel UI Parity', () => {
     const wp = new WorldPanelsHud()
     const inv = new InventoryPanel()
     wp.activePlayerInventory = inv
-    expect(wp.openVendorForNpc('Gheed', 'gamble', 30, 0)).toBe(true)
+    openGeneratedVendorShop(wp, 'Gheed', 'gamble', 30, 0)
 
     const { ctx, font, drawImageCalls, fontCalls } = createMockCanvasAndFont()
     wp.drawLeftDockPanel(ctx, 'vendor', { ...createFakeVendorAssets(), inventory: inv }, font)
@@ -367,27 +368,12 @@ describe('Diablo II 1.13c Vendor / BuySell Panel UI Parity', () => {
     const inv = new InventoryPanel()
     inv.gold = 50000
     wp.activePlayerInventory = inv
-    expect(wp.openVendorForNpc('Charsi', 'trade', 24, 0)).toBe(true)
+    openGeneratedVendorShop(wp, 'Charsi', 'trade', 24, 0)
 
-    // Damage an equipped item so Repair All has a non-zero cost
+    // Repair All total is supplied by HudModel (VendorRepairAllFn over priceItem113c type 3)
-    const helm: UiInventoryItem = {
+    const expectedCost = 1234
-      id: 'damaged-cap',
+    wp.vendorRepairAllCost = expectedCost
-      code: 'cap',
+    let repairAllCalls = 0
-      name: 'Cap',
-      nameZh: '帽子',
-      baseNameZh: '帽子',
-      quality: 'normal',
-      invFile: 'invcap',
-      invWidth: 2,
-      invHeight: 2,
-      allowedSlots: ['helm'],
-      stats: [],
-      identified: true,
-      durability: { current: 4, max: 12 },
-    }
-    inv.equipped.helm = helm
-    const expectedCost = wp.getRepairAllCost(inv)
-    expect(expectedCost).toBeGreaterThan(0)
 
     // Open-interval boundary check: relX = tableX (116) or tableX + 45 (161) must NOT hit
     expect(wp.hitTestVendorButtonSlot(80 + 116, 60 + 390)).toBeNull()
@@ -403,6 +389,9 @@ describe('Diablo II 1.13c Vendor / BuySell Panel UI Parity', () => {
       },
       onWaypointTeleport: () => {},
       inventory: inv,
+      onVendorRepairAll: () => {
+        repairAllCalls++
+      },
     }
 
     // Click slot 0 (Buy) -> latches 'buy' (button frame 3, cursor frame 3)
@@ -438,38 +427,37 @@ describe('Diablo II 1.13c Vendor / BuySell Panel UI Parity', () => {
       ),
     ).toBe(true)
 
-    // Click slot 3 (Repair All on Charsi) -> repairs item, clears state to 'idle', and does NOT close panel!
+    // Click slot 3 (Repair All on Charsi) -> sends the repair-all command, clears state to 'idle', and does NOT close panel!
     wp.handleLeftDockClick('vendor', 80 + VENDOR_BUTTON_TABLE_X[3] + 20, 60 + 390, callbacks)
     expect(closed).toBe(false)
     expect(wp.vendorTradeState).toBe('idle')
     expect(wp.getActiveVendorCursorFrame()).toBeNull()
     expect(wp.pressedMomentarySlot).toBe(3)
-    expect(helm.durability?.current).toBe(12)
+    expect(repairAllCalls).toBe(1)
     wp.releaseMomentaryVendorButton()
     expect(wp.pressedMomentarySlot).toBeNull()
 
     // Switch to Akara and click slot 3 (Close) -> closes panel, slot 2 (blank) is ignored
-    wp.openVendorForNpc('Akara', 'trade', 24, 0)
+    openGeneratedVendorShop(wp, 'Akara', 'trade', 24, 0, 2)
     expect(wp.hitTestVendorButtonSlot(80 + VENDOR_BUTTON_TABLE_X[2] + 20, 60 + 390)).toBeNull()
     wp.handleLeftDockClick('vendor', 80 + VENDOR_BUTTON_TABLE_X[3] + 20, 60 + 390, callbacks)
     expect(closed).toBe(true)
   })
 
-  it('auto-cycles to the next non-empty tab when buying the last item on the active tab', () => {
+  it('auto-cycles to the next non-empty tab when the server empties the active tab', () => {
     const wp = new WorldPanelsHud()
     const inv = new InventoryPanel()
     inv.gold = 999999
     wp.activePlayerInventory = inv
-    expect(wp.openVendorForNpc('Charsi', 'trade', 24, 0)).toBe(true)
+    openGeneratedVendorShop(wp, 'Charsi', 'trade', 24, 0)
     expect(wp.activeVendorTab).toBe('armor')
 
-    // Leave only 1 non-permStore item on the armor tab and buy it
+    // The server removed the last armor item (0x9D RemoveFromShop after a buy): HudModel re-applies the
-    const nonPerm = wp.vendorTabPlacements.armor.find(p => !p.item.permStore && !p.item.rawItem?.permStore)
+    // same store without it and D2Client 0x6fb3f710 advances to the next non-empty tab.
-    expect(nonPerm).toBeDefined()
+    const remaining = (['weapons1', 'weapons2', 'misc'] as const).flatMap((id, i) =>
-    wp.vendorTabPlacements.armor = [nonPerm!]
+      wp.vendorTabPlacements[id].map(placement => ({ storePage: i + 2, placement })),
-
+    )
-    const res = wp.buyFromActiveVendor(nonPerm!.col, nonPerm!.row, inv, false)
+    wp.setVendorShop({ npcId: 1, descriptor: wp.activeVendorDescriptor!, mode: 'trade', items: remaining })
-    expect(res.ok).toBe(true)
     expect(wp.vendorTabPlacements.armor).toHaveLength(0)
     expect(wp.activeVendorTab).toBe('weapons1')
   })
@@ -642,6 +630,7 @@ describe('Diablo II 1.13c Vendor / BuySell Panel UI Parity', () => {
           openedVendorMode = mode
         },
         onIdentifyAll: () => {},
+        onCancel: () => {},
       },
       font,
     )
@@ -654,7 +643,7 @@ describe('Diablo II 1.13c Vendor / BuySell Panel UI Parity', () => {
     const wp = new WorldPanelsHud()
     const inv = new InventoryPanel()
     wp.activePlayerInventory = inv
-    expect(wp.openVendorForNpc('Charsi', 'trade', 10, 0)).toBe(true)
+    openGeneratedVendorShop(wp, 'Charsi', 'trade', 10, 0)
 
     // Set player context: Level 10 Sorceress with 25 Str, 25 Dex
     wp.setPlayerContext({
@@ -860,7 +849,7 @@ describe('Diablo II 1.13c Vendor / BuySell Panel UI Parity', () => {
       dex: 500,
       classCode: 'sor',
     })
-    expect(wp.openVendorForNpc('Gheed', 'gamble', 99, 0)).toBe(true)
+    openGeneratedVendorShop(wp, 'Gheed', 'gamble', 99, 0)
     expect(wp.gamblePlacements.length).toBeGreaterThan(0)
 
     // Even when hovering a gamble item with an empty cursor, every gamble item background must be RED

tools/d2-bot.ts

@@ -18,7 +18,10 @@
  *   --idle=<seconds>           Stay in-game for N seconds (default: 5 for join, 60 for idle)
  *   --world                    Print ClientWorld state summary
  *   --capture=<out.d2cap>      Write .d2cap JSONL wire capture to disk
- *   --scenario=<name>          Scenario name for record command (town|combat|items|npc|chat|full)
+ *   --scenario=<name>          Scenario name for record command (town|combat|items|npc|chat|full, or a
+ *                              vendor scenario: inspect|vendor-open|vendor-buy-sell|vendor-repair|stash-gold|
+ *                              gamble|vendor-verify — see tools/lib/vendor-scenarios.ts)
+ *   --report=<out.json>        Write the vendor scenario report (server-driven before/after state) to disk
  */
 
 import { randomBytes } from 'node:crypto'
@@ -54,6 +57,7 @@ import {
   type GameServerAdapter,
 } from '../src/netproto/index.ts'
 import { connectNodeTcpStream } from './lib/node-tcp-stream.ts'
+import { isVendorScenario, runVendorScenario } from './lib/vendor-scenarios.ts'
 import {
   D2S_MAGIC,
   D2S_QUEST_OFFSET,
@@ -1461,7 +1465,7 @@ async function main(): Promise<void> {
       }
 
       const mapService =
-        cmd === 'walk'
+        cmd === 'walk' || (cmd === 'record' && isVendorScenario(scenario))
           ? await MapService.fromPackedDir(resolve(ROOT_DIR, 'public/act-packs/tiles'))
           : null
 
@@ -1515,8 +1519,19 @@ async function main(): Promise<void> {
 
       if (cmd === 'record') {
         console.log(`[d2-bot] Running scenario="${scenario}"...`)
+        if (isVendorScenario(scenario)) {
+          if (!mapService) throw new Error('vendor scenarios require the MapService')
+          const report = await runVendorScenario(scenario, world, adapter, mapService)
+          console.log(`[d2-bot] vendor report: ${JSON.stringify(report)}`)
+          if (typeof flags.report === 'string') {
+            const reportPath = resolve(flags.report)
+            mkdirSync(dirname(reportPath), { recursive: true })
+            writeFileSync(reportPath, JSON.stringify({ scenario, account: '<redacted>', character: charName, report }, null, 2))
+          }
+        } else {
           await runInGameScenario(scenario, world, adapter)
         }
+      }
 
       const defaultIdleSec = cmd === 'idle' ? 60 : cmd === 'record' ? 6 : 5
       const idleSec =

tools/lib/vendor-scenarios.ts

@@ -0,0 +1,426 @@
+/**
+ * Scripted vendor / stash / gamble scenarios for `tools/d2-bot.ts record --scenario=<name>`.
+ *
+ * Every state change printed here comes from server packets applied to `ClientWorld`
+ * (stat 14 / 15, 0x9C/0x9D item events, 0x2A NpcTransaction). Nothing is mutated locally.
+ *
+ * Scenarios:
+ *   inspect          print self / inventory / town NPC + object list (read-only)
+ *   vendor-open      Charsi: 0x13 -> 0x2F -> 0x38 action 1 (trade) -> 0x30 (fixture 05)
+ *   vendor-buy-sell  Akara: sell an inventory item, buy the cheapest affordable item, sell it back,
+ *                    attempt an unaffordable buy (fixture 06)
+ *   vendor-repair    Charsi: single-item repair + repair-all (fixture 07)
+ *   stash-gold       stash: deposit 1 / withdraw 1 / withdraw more than the bank holds / close (fixture 08)
+ *   gamble           Gheed: 0x38 action 2, attempt a gamble purchase (fixture 09)
+ *   vendor-verify    reversible end-to-end run: open shop, buy, sell back, repair, deposit 1, withdraw 1
+ */
+
+import type { MapService } from '../../src/client/map/map-service.ts'
+import { findPathWorld } from '../../src/client/motion/pathfind.ts'
+import { priceItem113c } from '../../src/client/ui-model/transaction-cost-input.ts'
+import type { ClientWorld } from '../../src/client/world/client-world.ts'
+import type { ClientUnit } from '../../src/client/world/client-unit.ts'
+import {
+  ClickButtonId,
+  unitTypeToId,
+  type ClientCommand,
+  type GameServerAdapter,
+  type ItemData,
+  type ServerEvent,
+} from '../../src/netproto/index.ts'
+
+/** monstats.txt hcIdx of the Act 1 town NPCs used here. */
+export const NPC_CLASS = {
+  Gheed: 147,
+  Akara: 148,
+  Charsi: 154,
+} as const
+
+/** objects.txt id 267 = bank (stash); D2Game 0x6fc917e0 requires interact state 2 with this class. */
+export const OBJECT_CLASS_STASH = 267
+
+const sleep = (ms: number): Promise<void> => new Promise((r) => setTimeout(r, ms))
+
+export const VENDOR_SCENARIOS = [
+  'inspect',
+  'vendor-open',
+  'vendor-buy-sell',
+  'vendor-repair',
+  'stash-gold',
+  'gamble',
+  'vendor-verify',
+] as const
+
+export function isVendorScenario(s: string): s is (typeof VENDOR_SCENARIOS)[number] {
+  return (VENDOR_SCENARIOS as readonly string[]).includes(s)
+}
+
+interface Ctx {
+  readonly world: ClientWorld
+  readonly map: MapService
+  /** Predicted own position (the server does not echo our own walk hops). */
+  pos: { x: number; y: number }
+  readonly adapter: GameServerAdapter
+  readonly log: (msg: string) => void
+  readonly tx: Array<Extract<ServerEvent, { type: 'NpcTransaction' }>>
+  readonly report: Record<string, unknown>
+}
+
+/** Sends a command and applies its local side effects to ClientWorld, like OnlineSession does. */
+function send(ctx: Ctx, cmd: ClientCommand): void {
+  ctx.adapter.send(cmd)
+  ctx.world.noteOutgoingCommand(cmd)
+}
+
+function fmtItem(it: ItemData): string {
+  return `#${it.id} ${it.code} q=${it.quality ?? '-'} loc=${it.location} page=${it.storePage} grid=(${it.gridX},${it.gridY}) act=0x${it.action.toString(16)}`
+}
+
+function dist(world: ClientWorld, u: ClientUnit, from?: { x: number; y: number }): number {
+  const p = from ?? world.self
+  return Math.hypot(u.x - p.x, u.y - p.y)
+}
+
+function findUnit(world: ClientWorld, kind: 'monster' | 'object', classId: number): ClientUnit {
+  const units = world.getUnitsByType(kind).filter((u) => u.classId === classId && u.x > 0 && u.y > 0)
+  if (units.length === 0) {
+    throw new Error(`no ${kind} with class ${classId} visible (area=${world.areaId})`)
+  }
+  units.sort((a, b) => dist(world, a) - dist(world, b))
+  return units[0]!
+}
+
+async function walkTo(ctx: Ctx, kind: 'monster' | 'object', u: ClientUnit, within = 4): Promise<void> {
+  if (dist(ctx.world, u, ctx.pos) <= within) return
+  if (!(await walkToPoint(ctx, u.x, u.y, within))) {
+    throw new Error(`no path to ${kind} #${u.id} (class ${u.classId}) from (${ctx.pos.x},${ctx.pos.y})`)
+  }
+  ctx.log(`walked to (${ctx.pos.x},${ctx.pos.y}); ${kind} #${u.id} dist=${dist(ctx.world, u, ctx.pos).toFixed(1)}`)
+}
+
+function activeView(ctx: Ctx) {
+  return ctx.map.getActiveLevelView() ?? ctx.map.getLevelView(ctx.world.areaId || 1, 'all', true)
+}
+
+/** Walks along a MapService path in <= 3 sub-tile hops; returns false when no path exists. */
+async function walkToPoint(ctx: Ctx, tx: number, ty: number, within: number): Promise<boolean> {
+  const view = activeView(ctx)
+  const res = findPathWorld(view, ctx.pos.x, ctx.pos.y, tx, ty, {
+    smooth: true,
+    nearestTargetRadius: within,
+    maxExpandedNodes: 32768,
+  })
+  if (res.path.length < 2) return false
+  for (const wp of res.path.slice(1)) {
+    // Subdivide into <= 3 sub-tile hops like the real client's short click-moves.
+    const d = Math.hypot(wp.x - ctx.pos.x, wp.y - ctx.pos.y)
+    const n = Math.max(1, Math.ceil(d / 3))
+    const sx = ctx.pos.x
+    const sy = ctx.pos.y
+    for (let i = 1; i <= n; i++) {
+      const hx = Math.round(sx + ((wp.x - sx) * i) / n)
+      const hy = Math.round(sy + ((wp.y - sy) * i) / n)
+      const hd = Math.hypot(hx - ctx.pos.x, hy - ctx.pos.y)
+      if (hd < 0.5) continue
+      send(ctx, { type: 'Move', run: true, to: { x: hx, y: hy } })
+      await sleep(Math.max(150, Math.ceil(hd * 140)))
+      ctx.world.tick()
+      ctx.pos = { x: hx, y: hy }
+    }
+  }
+  return true
+}
+
+/**
+ * Units are only visible near the player. When `classId` is not in view, walk to
+ * walkable town cells (coarse grid, farthest from everything visited first) until it shows up.
+ */
+async function seekUnit(ctx: Ctx, kind: 'monster' | 'object', classId: number, maxLegs = 10): Promise<ClientUnit> {
+  const visible = () => ctx.world.getUnitsByType(kind).some(u => u.classId === classId && u.x > 0 && u.y > 0)
+  const view = activeView(ctx)
+  const visited: Array<{ x: number; y: number }> = [{ ...ctx.pos }]
+  const STEP = 10
+  const SPREAD = 25
+  for (let leg = 0; leg < maxLegs && !visible(); leg++) {
+    const cands: Array<{ x: number; y: number; d: number }> = []
+    for (let ly = 2; ly < view.subHeight - 2; ly += STEP) {
+      for (let lx = 2; lx < view.subWidth - 2; lx += STEP) {
+        if (view.walkable[ly * view.subWidth + lx] !== 1) continue
+        const x = view.subOriginX + lx
+        const y = view.subOriginY + ly
+        if (visited.some(v => Math.hypot(v.x - x, v.y - y) < SPREAD)) continue
+        cands.push({ x, y, d: Math.min(...visited.map(v => Math.hypot(v.x - x, v.y - y))) })
+      }
+    }
+    cands.sort((a, b) => b.d - a.d)
+    const next = cands[0]
+    if (!next) break
+    visited.push(next)
+    ctx.log(`seek ${kind} class ${classId}: leg ${leg} -> (${next.x},${next.y}) view=${view.subWidth}x${view.subHeight}`)
+    if (!(await walkToPoint(ctx, next.x, next.y, 2))) leg--
+    await sleep(400)
+  }
+  return findUnit(ctx.world, kind, classId)
+}
+
+async function waitFor(ctx: Ctx, pred: () => boolean, timeoutMs: number, what: string): Promise<boolean> {
+  const end = Date.now() + timeoutMs
+  while (Date.now() < end) {
+    if (pred()) return true
+    await sleep(100)
+  }
+  ctx.log(`timeout waiting for ${what}`)
+  return false
+}
+
+async function waitTx(ctx: Ctx, fromIndex: number, timeoutMs = 3000): Promise<Extract<ServerEvent, { type: 'NpcTransaction' }> | null> {
+  const ok = await waitFor(ctx, () => ctx.tx.length > fromIndex, timeoutMs, '0x2A NpcTransaction')
+  if (!ok) return null
+  // Let the trailing 0x9C/0x9D/stat packets of the same transaction arrive.
+  await sleep(600)
+  return ctx.tx[fromIndex]!
+}
+
+function snapshot(ctx: Ctx, label: string): Record<string, unknown> {
+  const s = {
+    gold: ctx.world.self.gold,
+    stashGold: ctx.world.self.stashGold,
+    level: ctx.world.self.level,
+    inventory: ctx.world.containers.inventory.size,
+    shop: ctx.world.containers.shop.size,
+  }
+  ctx.log(`[${label}] gold=${s.gold} stash=${s.stashGold} clvl=${s.level} inv=${s.inventory} shop=${s.shop}`)
+  return s
+}
+
+async function openNpc(ctx: Ctx, npcClass: number): Promise<ClientUnit> {
+  const npc = await seekUnit(ctx, 'monster', npcClass)
+  ctx.log(`npc class=${npcClass} id=${npc.id} at (${npc.x},${npc.y}) dist=${dist(ctx.world, npc).toFixed(1)}`)
+  await walkTo(ctx, 'monster', npc)
+  const target = { unitType: unitTypeToId('monster'), id: npc.id }
+  send(ctx, { type: 'Interact', target })
+  await sleep(700)
+  send(ctx, { type: 'NpcInit', target })
+  await sleep(700)
+  return npc
+}
+
+async function closeNpc(ctx: Ctx, npc: ClientUnit): Promise<void> {
+  send(ctx, { type: 'NpcCancel', target: { unitType: unitTypeToId('monster'), id: npc.id } })
+  await sleep(800)
+  ctx.log(`closed npc #${npc.id}; shop items left in ClientWorld=${ctx.world.containers.shop.size}`)
+}
+
+async function openShop(ctx: Ctx, npc: ClientUnit, gamble: boolean): Promise<readonly ItemData[]> {
+  const before = ctx.world.containers.shop.size
+  send(ctx, gamble ? { type: 'NpcOpenGamble', npcId: npc.id } : { type: 'NpcOpenTrade', npcId: npc.id })
+  await waitFor(ctx, () => ctx.world.containers.shop.size > before, 4000, 'shop items')
+  await sleep(1200)
+  const items = [...ctx.world.containers.shop.values()]
+  ctx.log(`${gamble ? 'gamble' : 'trade'} shop opened: ${items.length} items`)
+  const pages = new Map<number, number>()
+  for (const it of items) pages.set(it.storePage, (pages.get(it.storePage) ?? 0) + 1)
+  ctx.log(`  storePage histogram: ${[...pages].map(([p, n]) => `${p}:${n}`).join(' ')}`)
+  for (const it of items.slice(0, 80)) ctx.log(`  shop ${fmtItem(it)}`)
+  return items
+}
+
+function sellCandidate(world: ClientWorld): ItemData | undefined {
+  // Inventory items only (dwMode 0 = stored); never equipped gear or belt potions.
+  return [...world.containers.inventory.values()].sort((a, b) => a.id - b.id)[0]
+}
+
+async function sell(ctx: Ctx, npc: ClientUnit, item: ItemData, label: string): Promise<void> {
+  const g0 = ctx.world.self.gold
+  const i = ctx.tx.length
+  ctx.log(`${label}: sell ${fmtItem(item)}`)
+  send(ctx, { type: 'NpcSell', npcId: npc.id, itemId: item.id, itemMode: 0, cost: 1 })
+  const t = await waitTx(ctx, i)
+  ctx.log(`${label}: result=${t?.result} flag=${t?.flag} itemId=0x${(t?.itemId ?? 0).toString(16)} gold@11=${t?.gold} | stat14 ${g0} -> ${ctx.world.self.gold} (Δ${ctx.world.self.gold - g0}) stillInInv=${ctx.world.containers.inventory.has(item.id)}`)
+  ctx.report[label] = { item: item.code, result: t?.result, flag: t?.flag, goldBefore: g0, goldAfter: ctx.world.self.gold }
+}
+
+async function buy(
+  ctx: Ctx,
+  npc: ClientUnit,
+  item: ItemData,
+  opts: { gamble: boolean; shiftFill: boolean; cost: number },
+  label: string,
+): Promise<number | undefined> {
+  const g0 = ctx.world.self.gold
+  const inv0 = new Set(ctx.world.containers.inventory.keys())
+  const belt0 = new Set(ctx.world.containers.belt.keys())
+  const i = ctx.tx.length
+  ctx.log(`${label}: buy ${fmtItem(item)} gamble=${opts.gamble} shift=${opts.shiftFill} cost=${opts.cost}`)
+  send(ctx, { type: 'NpcBuy', npcId: npc.id, itemId: item.id, itemMode: 0, ...opts })
+  const t = await waitTx(ctx, i)
+  const newInv = [...ctx.world.containers.inventory.values()].filter((x) => !inv0.has(x.id))
+  const newBelt = [...ctx.world.containers.belt.values()].filter((x) => !belt0.has(x.id))
+  ctx.log(`${label}: result=${t?.result} flag=${t?.flag} itemId=0x${(t?.itemId ?? 0).toString(16)} gold@11=${t?.gold} | stat14 ${g0} -> ${ctx.world.self.gold} (Δ${ctx.world.self.gold - g0}) newInv=[${newInv.map(fmtItem).join('; ')}] newBelt=${newBelt.length}`)
+  ctx.report[label] = { item: item.code, result: t?.result, flag: t?.flag, goldBefore: g0, goldAfter: ctx.world.self.gold, newInv: newInv.map((x) => x.id) }
+  return newInv[0]?.id
+}
+
+async function stashGold(ctx: Ctx, button: number, amount: number, label: string): Promise<void> {
+  const g0 = ctx.world.self.gold
+  const s0 = ctx.world.self.stashGold
+  send(ctx, { type: 'ClickButton', buttonId: button, amount })
+  await sleep(1500)
+  ctx.log(`${label}: 0x4F 0x${button.toString(16)} amount=${amount} | gold ${g0} -> ${ctx.world.self.gold}, stash ${s0} -> ${ctx.world.self.stashGold}`)
+  ctx.report[label] = { amount, goldBefore: g0, goldAfter: ctx.world.self.gold, stashBefore: s0, stashAfter: ctx.world.self.stashGold }
+}
+
+async function openStash(ctx: Ctx): Promise<void> {
+  const stash = findUnit(ctx.world, 'object', OBJECT_CLASS_STASH)
+  ctx.log(`stash object id=${stash.id} at (${stash.x},${stash.y}) dist=${dist(ctx.world, stash).toFixed(1)}`)
+  await walkTo(ctx, 'object', stash, 3)
+  send(ctx, { type: 'Interact', target: { unitType: unitTypeToId('object'), id: stash.id } })
+  await sleep(1500)
+}
+
+function damagedEquipped(world: ClientWorld): ItemData | undefined {
+  for (const it of world.containers.equipment.values()) {
+    if (it.curDurability !== undefined && it.maxDurability !== undefined && it.curDurability < it.maxDurability) return it
+  }
+  return undefined
+}
+
+export async function runVendorScenario(
+  scenario: (typeof VENDOR_SCENARIOS)[number],
+  world: ClientWorld,
+  adapter: GameServerAdapter,
+  map: MapService,
+): Promise<Record<string, unknown>> {
+  const tx: Ctx['tx'] = []
+  const off = adapter.onEvent((ev) => {
+    if (ev.type === 'NpcTransaction') tx.push(ev)
+  })
+  const ctx: Ctx = {
+    world,
+    adapter,
+    map,
+    pos: { x: world.self.x, y: world.self.y },
+    tx,
+    report: {},
+    log: (m) => console.log(`[vendor] ${m}`),
+  }
+  const offPos = adapter.onEvent((ev) => {
+    // Server-authoritative corrections of our own position.
+    if (ev.type === 'UnitReassign' && ev.unitType === 'player' && ev.id === world.selfId) ctx.pos = { x: ev.at.x, y: ev.at.y }
+  })
+  try {
+    await sleep(1500)
+    ctx.report.before = snapshot(ctx, 'before')
+    ctx.log(`area=${world.areaId} act=${world.act} self=(${world.self.x},${world.self.y})`)
+    if (scenario === 'inspect') {
+      for (const it of world.containers.inventory.values()) ctx.log(`inv ${fmtItem(it)}`)
+      for (const it of world.containers.equipment.values()) {
+        ctx.log(`eq ${fmtItem(it)} dur=${it.curDurability}/${it.maxDurability} bodyLoc=${it.bodyLoc}`)
+      }
+      for (const it of world.containers.belt.values()) ctx.log(`belt ${fmtItem(it)}`)
+      for (const u of world.getUnitsByType('monster')) ctx.log(`npc #${u.id} class=${u.classId} at (${u.x},${u.y})`)
+      for (const u of world.getUnitsByType('object')) ctx.log(`obj #${u.id} class=${u.classId} at (${u.x},${u.y})`)
+    } else if (scenario === 'vendor-open') {
+      const npc = await openNpc(ctx, NPC_CLASS.Charsi)
+      const items = await openShop(ctx, npc, false)
+      ctx.report.shopItems = items.length
+      await closeNpc(ctx, npc)
+    } else if (scenario === 'vendor-buy-sell' || scenario === 'vendor-verify') {
+      const npc = await openNpc(ctx, NPC_CLASS.Akara)
+      const items = await openShop(ctx, npc, false)
+      ctx.report.shopItems = items.length
+      if (scenario === 'vendor-buy-sell') {
+        // Starter items are the only natural gold source in town for a fresh character.
+        let n = 0
+        for (let cand = sellCandidate(world); cand && n < 2; cand = sellCandidate(world), n++) {
+          await sell(ctx, npc, cand, `sell-starter-${n}`)
+        }
+      }
+      // Cheapest consumable by code family that the server can price (hp1 / mp1 / tsc / isc).
+      const prefer = ['hp1', 'mp1', 'isc', 'tsc', 'hp2', 'mp2']
+      const target = prefer.map((c) => items.find((it) => it.code === c)).find((x) => x !== undefined)
+      if (target) {
+        // Display price from the 1.13c #10107 port; D2Game ignores the cost field (0x6fcdf200).
+        const price = priceItem113c(world, target, 0, NPC_CLASS.Akara)
+        ctx.report.buyPrice = { item: target.code, price, goldBefore: world.self.gold }
+        ctx.log(`buy price of ${target.code} at Akara (1.13c port) = ${price}, gold=${world.self.gold}`)
+        const boughtId = await buy(ctx, npc, target, { gamble: false, shiftFill: false, cost: price }, 'buy')
+        if (boughtId !== undefined) {
+          const bought = world.containers.inventory.get(boughtId)
+          if (bought) await sell(ctx, npc, bought, 'sell-back')
+        }
+      } else {
+        ctx.log('no consumable on the shelf to buy')
+      }
+      if (scenario === 'vendor-buy-sell') {
+        const pricey = items.filter((it) => it.code !== target?.code).sort((a, b) => b.id - a.id)[0]
+        if (pricey) await buy(ctx, npc, pricey, { gamble: false, shiftFill: false, cost: 1 }, 'buy-unaffordable')
+        if (target) await buy(ctx, npc, target, { gamble: false, shiftFill: true, cost: 1 }, 'buy-shift')
+      }
+      await closeNpc(ctx, npc)
+      if (scenario === 'vendor-verify') {
+        const smith = await openNpc(ctx, NPC_CLASS.Charsi)
+        await openShop(ctx, smith, false)
+        const dmg = damagedEquipped(world)
+        const i = ctx.tx.length
+        if (dmg) {
+          const cur = dmg.curDurability!
+          adapter.send({ type: 'NpcRepairItem', npcId: smith.id, itemId: dmg.id, itemMode: 1, durability: cur })
+        } else {
+          adapter.send({ type: 'NpcRepairAll', npcId: smith.id })
+        }
+        const t = await waitTx(ctx, i)
+        ctx.log(`repair(${dmg ? 'item' : 'all'}): result=${t?.result} flag=${t?.flag} gold=${world.self.gold}`)
+        ctx.report.repair = { kind: dmg ? 'item' : 'all', result: t?.result, flag: t?.flag }
+        await closeNpc(ctx, smith)
+        await openStash(ctx)
+        await stashGold(ctx, ClickButtonId.DepositGold, 1, 'deposit-1')
+        await stashGold(ctx, ClickButtonId.WithdrawGold, 1, 'withdraw-1')
+        adapter.send({ type: 'ClickButton', buttonId: ClickButtonId.CloseStash, amount: 0 })
+        await sleep(800)
+      }
+    } else if (scenario === 'vendor-repair') {
+      const npc = await openNpc(ctx, NPC_CLASS.Charsi)
+      await openShop(ctx, npc, false)
+      const dmg = damagedEquipped(world)
+      const eq = dmg ?? [...world.containers.equipment.values()][0]
+      if (eq) {
+        if (eq.curDurability === undefined) throw new Error(`equipped ${eq.code} has no durability`)
+        const cur = eq.curDurability
+        const i = ctx.tx.length
+        ctx.log(`repair-item ${fmtItem(eq)} durability=${cur} damaged=${dmg !== undefined}`)
+        adapter.send({ type: 'NpcRepairItem', npcId: npc.id, itemId: eq.id, itemMode: 1, durability: cur })
+        const t = await waitTx(ctx, i)
+        ctx.log(`repair-item: result=${t?.result} flag=${t?.flag} gold=${world.self.gold}`)
+        ctx.report.repairItem = { item: eq.code, damaged: dmg !== undefined, result: t?.result, flag: t?.flag }
+      }
+      await sleep(2100) // D2Client throttles repair-all to one request per 2000 ms
+      const i = ctx.tx.length
+      adapter.send({ type: 'NpcRepairAll', npcId: npc.id })
+      const t = await waitTx(ctx, i)
+      ctx.log(`repair-all: result=${t?.result} flag=${t?.flag} gold=${world.self.gold}`)
+      ctx.report.repairAll = { result: t?.result, flag: t?.flag }
+      await closeNpc(ctx, npc)
+    } else if (scenario === 'stash-gold') {
+      await openStash(ctx)
+      await stashGold(ctx, ClickButtonId.DepositGold, 1, 'deposit-1')
+      await stashGold(ctx, ClickButtonId.WithdrawGold, 1, 'withdraw-1')
+      await stashGold(ctx, ClickButtonId.WithdrawGold, world.self.stashGold + 1, 'withdraw-more-than-bank')
+      adapter.send({ type: 'ClickButton', buttonId: ClickButtonId.CloseStash, amount: 0 })
+      await sleep(1000)
+    } else if (scenario === 'gamble') {
+      const npc = await openNpc(ctx, NPC_CLASS.Gheed)
+      const items = await openShop(ctx, npc, true)
+      ctx.report.shopItems = items.length
+      const pick = items.find((it) => it.code === 'rin') ?? items[0]
+      if (pick) await buy(ctx, npc, pick, { gamble: true, shiftFill: false, cost: 1 }, 'gamble-buy')
+      await closeNpc(ctx, npc)
+    }
+    ctx.report.after = snapshot(ctx, 'after')
+    ctx.report.tx = tx.map((t) => ({ result: t.result, flag: t.flag, itemId: t.itemId, gold: t.gold }))
+    return ctx.report
+  } finally {
+    off()
+    offPos()
+  }
+}