diablo2-web/scripts/stress-test-m3-adversarial.ts

import { resolveUnsetSize, UnresolvedLevelSizeError } from '../src/game/wilderness.ts'
import type { WildernessPiece, WildernessRequest } from '../src/game/wilderness.ts'
import type { Ds1, Ds1Cell } from '../src/formats/ds1.ts'

function makeMockDs1(width: number, height: number): Ds1 {
  const cells: Ds1Cell[][] = []
  for (let y = 0; y < height; y += 1) {
    const row: Ds1Cell[] = []
    for (let x = 0; x < width; x += 1) {
      row.push({
        walls: [],
        floors: [{ prop1: 2, sequence: 0, style: 1, unknown1: 0, unknown2: 0, hidden: false }],
        shadows: [],
        substitutions: [],
      })
    }
    cells.push(row)
  }
  return {
    version: 7,
    width,
    height,
    act: 5,
    substitutionType: 0,
    wallLayers: 1,
    floorLayers: 1,
    cells,
    objects: [],
    npcPathOffset: null,
  }
}

console.log('=== STARTING ADVERSARIAL STRESS TEST FOR resolveUnsetSize ===')

let failures = 0

function assert(condition: boolean, msg: string) {
  if (!condition) {
    console.error(`FAIL: ${msg}`)
    failures++
  } else {
    console.log(`PASS: ${msg}`)
  }
}

// 1. Anti-silent failure: Empty pieces throws UnresolvedLevelSizeError
try {
  resolveUnsetSize({
    levelId: 111,
    levelName: 'Act 5 - Barricade 1',
    levelTypeName: 'Act 5 - Barricade',
    sizeX: -1,
    sizeY: -1,
    subType: 10,
    subTheme: 0,
    seed: 12345,
    pieces: [],
    substitutions: [],
  })
  assert(false, 'Expected empty pieces to throw UnresolvedLevelSizeError')
} catch (err) {
  assert(err instanceof UnresolvedLevelSizeError, 'Empty pieces throws instance of UnresolvedLevelSizeError')
  assert((err as Error).message.includes('Level 111 (Act 5 - Barricade 1)'), 'Error message contains level info')
}

// 2. Anti-silent failure: Non-barricade pieces throw UnresolvedLevelSizeError
try {
  resolveUnsetSize({
    levelId: 111,
    levelName: 'Act 5 - Barricade 1',
    levelTypeName: 'Act 5 - Barricade',
    sizeX: -1,
    sizeY: -1,
    subType: 10,
    subTheme: 0,
    seed: 12345,
    pieces: [
      { name: 'Act 5 - Siege 1', border: false, levels: [makeMockDs1(10, 10)] },
    ],
    substitutions: [],
  })
  assert(false, 'Expected non-barricade pieces to throw UnresolvedLevelSizeError')
} catch (err) {
  assert(err instanceof UnresolvedLevelSizeError, 'Non-barricade pieces throw instance of UnresolvedLevelSizeError')
}

// 3. Fuzzing pieces dimensions: 10,000 random dimensions test
let allBoundsHold = true
let allAspectRatiosHold = true
for (let i = 0; i < 10000; i++) {
  const randW1 = Math.floor(Math.random() * 2000) - 500 // -500 to 1500
  const randH1 = Math.floor(Math.random() * 2000) - 500
  const randW2 = Math.floor(Math.random() * 2000) - 500
  const randH2 = Math.floor(Math.random() * 2000) - 500

  const res = resolveUnsetSize({
    levelId: 111,
    levelName: 'Act 5 - Barricade 1',
    levelTypeName: 'Act 5 - Barricade',
    sizeX: -1,
    sizeY: -1,
    subType: 10,
    subTheme: 0,
    seed: i,
    pieces: [
      { name: 'Act 5 - Barricade Entrance', border: false, levels: [makeMockDs1(randW1, randH1)] },
      { name: 'Act 5 - Barricade Exit', border: false, levels: [makeMockDs1(randW2, randH2)] },
    ],
    substitutions: [],
  })

  if (res.sizeX < 48 || res.sizeX > 64 || res.sizeY < 160 || res.sizeY > 192) {
    allBoundsHold = false
    console.error(`Bounds failure at iteration ${i}: sizeX=${res.sizeX}, sizeY=${res.sizeY}`)
    break
  }
  if (res.sizeY <= res.sizeX || (res.sizeY / res.sizeX) < 2.5) {
    allAspectRatiosHold = false
    console.error(`Aspect ratio failure at iteration ${i}: sizeX=${res.sizeX}, sizeY=${res.sizeY}`)
    break
  }
}
assert(allBoundsHold, '10,000 random input tests: sizeX in [48..64] and sizeY in [160..192] strictly hold')
assert(allAspectRatiosHold, '10,000 random input tests: sizeY > sizeX and aspect ratio >= 2.5 strictly hold')

// 4. Overrides
const overrideRes = resolveUnsetSize({
  levelId: 111,
  levelName: 'Act 5 - Barricade 1',
  levelTypeName: 'Act 5 - Barricade',
  sizeX: -1,
  sizeY: -1,
  sizeOverride: { x: 72, y: 144 },
  subType: 10,
  subTheme: 0,
  seed: 999,
  pieces: [],
  substitutions: [],
})
assert(overrideRes.sizeX === 72 && overrideRes.sizeY === 144, 'sizeOverride is respected exactly')

if (failures > 0) {
  console.error(`\nFAILED: ${failures} assertions failed!`)
  process.exit(1)
} else {
  console.log('\nSUCCESS: All adversarial checks passed!')
}