/**
 * Decode a sprite whose frames each have their own width.
 *
 * Diablo I's tile and cursor sheets are the case single-width auto-detection
 * cannot serve: the inventory cursor sheet is paired with a sidecar list of
 * per-frame widths, and dungeon tile sheets take their widths from the tile
 * definitions. This drives the decoder with such a list against a real member,
 * which is the only way to show the per-frame path actually matches shipped
 * data.
 *
 * Usage: node scripts/verify-widths.ts <archive> <member> <widths-file>
 */
import { readFile } from 'node:fs/promises'
import { MpqArchive } from '../src/mpq/archive.ts'
import { fileSource } from '../src/mpq/file-source.ts'
import { decodeSpriteFile } from '../src/formats/cel.ts'

const [path, member, widthsPath] = process.argv.slice(2)
if (path === undefined || member === undefined || widthsPath === undefined) {
  console.error('usage: node scripts/verify-widths.ts <archive> <member> <widths-file>')
  process.exit(2)
}

const widths = (await readFile(widthsPath, 'utf8'))
  .split(/\s+/)
  .filter(part => part !== '')
  .map(part => Number.parseInt(part, 10))
if (widths.some(width => !Number.isFinite(width) || width <= 0)) {
  console.error('widths file has a non-positive or unparsable entry')
  process.exit(1)
}

const archive = await MpqArchive.open(await fileSource(path))
const mode = member.toLowerCase().endsWith('.cl2') ? 'cl2' : 'cel'
const file = archive.find(member)
if (file === undefined) {
  console.error(`no such member: ${member}`)
  process.exit(1)
}

const data = await archive.read(file)
const sheet = decodeSpriteFile(data, mode, { widths })
const frames = sheet.groups.flatMap(group => group.frames)
const heights = frames.map(frame => frame.height)
const coverage = frames.map(frame => {
  let opaque = 0
  for (const value of frame.mask) if (value !== 0) opaque += 1
  return opaque
})
const empty = coverage.filter(count => count === 0).length

console.log(`archive    ${path}`)
console.log(`member     ${member} (${String(data.byteLength)} bytes, ${mode})`)
console.log(`widths     ${String(widths.length)} entries from ${widthsPath}`)
console.log(`groups     ${String(sheet.groups.length)}`)
console.log(`frames     ${String(frames.length)} decoded`)
console.log(`heights    ${String(Math.min(...heights))}..${String(Math.max(...heights))}`)
console.log(`pixels     ${String(Math.min(...coverage))}..${String(Math.max(...coverage))} opaque per frame`)
console.log(`empty      ${String(empty)} frames with no opaque pixels`)
console.log(empty === 0 && frames.length === widths.length
  ? 'RESULT     every frame decoded and matched its width entry exactly'
  : 'RESULT     mismatch — check the width list against the frame count')