diablo2-web/tests/skills/ama/skill-016-exploding-arrow.test.ts

/**
 * 1.13c Numerical & Runtime Verification Suite — Skill #016: Exploding Arrow (AMA)
 * Gitea Tracking Issue: #170
 */
import { describe, expect, it } from 'vitest'
import { getSharedDataRegistry } from '../../../src/game/engine/data-registry.ts'
import { UnitStatList } from '../../../src/game/engine/stat-list.ts'
import { WorldArena } from '../../../src/game/engine/world-arena.ts'
import { skillModule } from '../../../src/game/skills/impl/ama/skill-016-exploding-arrow.ts'
import { calculateExplodingArrowStats } from '../../../src/game/skills/amazon-bow.ts'

describe('[Skill #016] Exploding Arrow (AMA) — 1.13c Parity (Issue #170)', () => {
  it('evaluates exact 1.13c Skills.txt / Missiles.txt formulas at slvl 1, 10, and 20', async () => {
    const registry = await getSharedDataRegistry()
    const skillRec = registry.getSkillById(16)!
    expect(skillRec).toBeDefined()
    expect(skillModule.skillId).toBe(16)
    expect(skillModule.name).toBe("Exploding Arrow")
    expect(skillModule.charClass).toBe("ama")

    const stats1 = new UnitStatList()
    stats1.setBaseSkillLevel(16, 1)
    const r1 = skillModule.evaluate!({ registry, skill: skillRec, slvl: 1, blvl: 1, statList: stats1 })
    expect(r1.manaCost).toBe(5)
    expect(r1.manaCost256).toBe(1280)
    expect(r1.minPhysDmg).toBe(0)
    expect(r1.maxPhysDmg).toBe(0)
    expect(r1.minElemDmg256).toBe(512)
    expect(r1.maxElemDmg256).toBe(1536)

    const stats10 = new UnitStatList()
    stats10.setBaseSkillLevel(16, 10)
    const r10 = skillModule.evaluate!({ registry, skill: skillRec, slvl: 10, blvl: 10, statList: stats10 })
    expect(r10.manaCost).toBe(9)
    expect(r10.manaCost256).toBe(2432)
    expect(r10.minPhysDmg).toBe(0)
    expect(r10.maxPhysDmg).toBe(0)
    expect(r10.minElemDmg256).toBe(13056)
    expect(r10.maxElemDmg256).toBe(14592)

    const stats20 = new UnitStatList()
    stats20.setBaseSkillLevel(16, 20)
    const r20 = skillModule.evaluate!({ registry, skill: skillRec, slvl: 20, blvl: 20, statList: stats20 })
    expect(r20.manaCost).toBe(14)
    expect(r20.manaCost256).toBe(3712)
    expect(r20.minPhysDmg).toBe(0)
    expect(r20.maxPhysDmg).toBe(0)
    expect(r20.minElemDmg256).toBe(33024)
    expect(r20.maxElemDmg256).toBe(38144)
    expect(r20.durationFrames).toBe(0)
    expect(r20.radiusSubtiles).toBe(0)
    expect(r20.petMax).toBe(0)
    expect(r20.cooldownFrames).toBe(0)
  })

  it('enforces 1.13c blvl synergy rule (hard points boost synergy; +skills and item charges do NOT)', async () => {
    const registry = await getSharedDataRegistry()
    const skillRec = registry.getSkillById(16)!
    const synId = 7

    const statsBase = new UnitStatList()
    statsBase.setBaseSkillLevel(16, 20)
    if (synId !== null) {
      statsBase.setBaseSkillLevel(synId, 20)
    }
    const withHardPoints = skillModule.evaluate!({
      registry,
      skill: skillRec,
      slvl: 20,
      blvl: 20,
      statList: statsBase,
    })
    expect(withHardPoints.synergyBonusPct).toBe(240)

    // +20 allskills and +33 Marrowwalk charges without hard points must yield 0 synergy
    const statsSoftOnly = new UnitStatList()
    statsSoftOnly.setBaseSkillLevel(16, 20)
    statsSoftOnly.addStat('item_allskills', 20)
    if (synId !== null) {
      statsSoftOnly.setChargedSkillLevel(synId, 33)
    }
    const withSoftOnly = skillModule.evaluate!({
      registry,
      skill: skillRec,
      slvl: 20,
      blvl: 20,
      statList: statsSoftOnly,
    })
    expect(withSoftOnly.synergyBonusPct).toBe(0)
  })

  it('executes runtime skill effect in WorldArena (castCount, action frame, and combat/state/missile/summon outcome)', async () => {
    const registry = await getSharedDataRegistry()
    const arena = new WorldArena({
      registry,
      classCode: "ama",
      skillId: 16,
      slvl: 20,
    })
    const outcome = arena.triggerCast()
    arena.stepTicks(15)
    const dbg = arena.getDebugState()

    expect(dbg.ready).toBe(true)
    expect(dbg.skillId).toBe(16)
    expect(dbg.castCount).toBeGreaterThanOrEqual(1)
    expect(dbg.actionFrameTriggered).toBe(true)
    expect(outcome?.executed).toBe(true)
  })

  it('validates 1.13c calculateExplodingArrowStats pure calculations and AoE invariants', () => {
    // Level 1: 2-6 blast fire dmg, 80 sub-pixel AoE, +20% AR, 5.0 mana
    const s1 = calculateExplodingArrowStats(1)
    expect(s1.minBlastDamage).toBe(2)
    expect(s1.maxBlastDamage).toBe(6)
    expect(s1.radiusPx).toBe(80)
    expect(s1.toHitBonusPct).toBe(20)
    expect(s1.manaCost).toBe(5.0)

    // Level 10: 51-57 blast fire dmg, +101% AR, 9.5 mana
    const s10 = calculateExplodingArrowStats(10)
    expect(s10.minBlastDamage).toBe(51)
    expect(s10.maxBlastDamage).toBe(57)
    expect(s10.toHitBonusPct).toBe(101)
    expect(s10.manaCost).toBe(9.5)

    // Level 20: 129-149 blast fire dmg, +191% AR, 14.5 mana
    const s20 = calculateExplodingArrowStats(20)
    expect(s20.minBlastDamage).toBe(129)
    expect(s20.maxBlastDamage).toBe(149)
    expect(s20.toHitBonusPct).toBe(191)
    expect(s20.manaCost).toBe(14.5)

    // Synergy test: Fire Arrow +12%/level
    const s20Syn = calculateExplodingArrowStats(20, { fireArrow: 20 })
    expect(s20Syn.synergyBonusPct).toBe(240)
    expect(s20Syn.synergyMultiplier).toBe(3.4)
    expect(s20Syn.minBlastDamage).toBe(Math.floor(129 * 3.4))
    expect(s20Syn.maxBlastDamage).toBe(Math.floor(149 * 3.4))

    // Monotonicity checks
    for (let lvl = 1; lvl < 30; lvl++) {
      const cur = calculateExplodingArrowStats(lvl)
      const nxt = calculateExplodingArrowStats(lvl + 1)
      expect(nxt.minBlastDamage).toBeGreaterThanOrEqual(cur.minBlastDamage)
      expect(nxt.maxBlastDamage).toBeGreaterThanOrEqual(cur.maxBlastDamage)
      expect(nxt.toHitBonusPct).toBeGreaterThan(cur.toHitBonusPct)
      expect(nxt.manaCost).toBeGreaterThan(cur.manaCost)
    }

    // Boundary resilience
    const sZero = calculateExplodingArrowStats(0)
    expect(sZero.minBlastDamage).toBe(2)
    expect(sZero.manaCost).toBe(5.0)

    const sNeg = calculateExplodingArrowStats(-3)
    expect(sNeg.minBlastDamage).toBe(2)

    const sNan = calculateExplodingArrowStats(NaN)
    expect(sNan.minBlastDamage).toBe(2)

    const sFrac = calculateExplodingArrowStats(8.6)
    expect(sFrac.minBlastDamage).toBe(calculateExplodingArrowStats(8).minBlastDamage)
  })
})