import { describe, it, expect } from 'vitest'
import { MONSTER_COMPONENTS, findMonsterLayerSprite } from '../src/game/monster-art.ts'

describe('monster-art', () => {
  it('covers all 16 monster composite component folders', () => {
    expect(MONSTER_COMPONENTS.length).toBe(16)
    expect(MONSTER_COMPONENTS[0]).toBe('hd')
    expect(MONSTER_COMPONENTS[1]).toBe('tr')
    expect(MONSTER_COMPONENTS[8]).toBe('s1')
    expect(MONSTER_COMPONENTS[15]).toBe('s8')
  })

  it('finds monster layer sprites by convention', () => {
    const names = [
      'data\\global\\monsters\\fa\\tr\\fatrlitwlhth.dcc',
      'data\\global\\monsters\\fa\\s1\\fas1litwlhth.dcc',
      'data\\global\\monsters\\fa\\rh\\farhaxewlhth.dcc',
      'data\\global\\monsters\\fa\\sh\\fashbucwlhth.dcc',
    ]
    const root = 'data\\global\\monsters\\fa\\'
    const hit = findMonsterLayerSprite(names, root, 'fa', 'wl', 'hth', 'tr')
    expect(hit).toBe('data\\global\\monsters\\fa\\tr\\fatrlitwlhth.dcc')

    const missing = findMonsterLayerSprite(names, root, 'fa', 'wl', 'hth', 'hd')
    expect(missing).toBeUndefined()
  })

  it('correctly maps 8 COF directions to permuted DCC directions via dir64ToDcc', async () => {
    const { dir64ToDcc } = await import('../src/game/character.ts')
    // In D2 DCC files with 8 directions, order is permuted: [4, 0, 5, 1, 6, 2, 7, 3]
    const cofDirections = 8
    const dccDirs = Array.from({ length: cofDirections }, (_, dir) => {
      const dir64 = Math.round((dir * 64) / cofDirections)
      return dir64ToDcc(dir64, 8)
    })
    expect(dccDirs).toEqual([4, 0, 5, 1, 6, 2, 7, 3])
  })

  it('calculates 8-direction facing correctly from dx, dy in combat.ts', async () => {
    const { facingOf } = await import('../src/game/combat.ts')
    // 0: South (dx=0, dy>0)
    expect(facingOf(0, 10)).toBe(0)
    // 1: South-West (dx<0, dy>0)
    expect(facingOf(-10, 10)).toBe(1)
    // 2: West (dx<0, dy=0)
    expect(facingOf(-10, 0)).toBe(2)
    // 3: North-West (dx<0, dy<0)
    expect(facingOf(-10, -10)).toBe(3)
    // 4: North (dx=0, dy<0)
    expect(facingOf(0, -10)).toBe(4)
    // 5: North-East (dx>0, dy<0)
    expect(facingOf(10, -10)).toBe(5)
    // 6: East (dx>0, dy=0)
    expect(facingOf(10, 0)).toBe(6)
    // 7: South-East (dx>0, dy>0)
    expect(facingOf(10, 10)).toBe(7)
    // Stationary
    expect(facingOf(0, 0)).toBe(0)
  })
})