import { test } from 'node:test'
import assert from 'node:assert/strict'
import { mkdtemp, rm, writeFile } from 'node:fs/promises'
import { tmpdir } from 'node:os'
import { resolve } from 'node:path'
import { PNG } from 'pngjs'
import { scanCardCatalog } from './card-catalog.mjs'

function png(width, height, pixel) {
  const image = new PNG({ width, height })
  for (let offset = 0; offset < image.data.length; offset += 4) {
    image.data.set(pixel, offset)
  }
  return PNG.sync.write(image)
}

test('catalog pairs filename-based card art with validated masks', async (t) => {
  const root = await mkdtemp(resolve(tmpdir(), 'card-catalog-'))
  t.after(() => rm(root, { recursive: true }))
  await Promise.all([
    writeFile(resolve(root, 'david.png'), png(10, 14, [20, 40, 60, 255])),
    writeFile(resolve(root, 'david-mask.png'), png(10, 14, [128, 128, 128, 255])),
  ])
  const catalog = await scanCardCatalog(root)
  assert.deepEqual(catalog.errors, [])
  assert.equal(catalog.cards.length, 1)
  assert.equal(catalog.cards[0].name, 'david')
  assert.match(catalog.cards[0].artwork, /^\/card-art\/david\.png\?v=[0-9a-f]{16}$/)
  assert.equal(catalog.cards[0].width, 10)
  assert.equal(catalog.cards[0].height, 14)
})

test('catalog reports missing pairs and invalid runtime images explicitly', async (t) => {
  const root = await mkdtemp(resolve(tmpdir(), 'card-catalog-invalid-'))
  t.after(() => rm(root, { recursive: true }))
  await Promise.all([
    writeFile(resolve(root, 'orphan.png'), png(10, 14, [20, 40, 60, 255])),
    writeFile(resolve(root, 'mask-only-mask.png'), png(10, 14, [0, 0, 0, 255])),
    writeFile(resolve(root, 'bad.png'), png(10, 14, [20, 40, 60, 254])),
    writeFile(resolve(root, 'bad-mask.png'), png(10, 14, [20, 21, 20, 255])),
  ])
  const catalog = await scanCardCatalog(root)
  assert.deepEqual(catalog.cards, [])
  assert.ok(catalog.errors.some(error => error.includes('Missing orphan-mask.png')))
  assert.ok(catalog.errors.some(error => error.includes('Missing mask-only.png')))
  assert.ok(catalog.errors.some(error => error.includes('bad.png must be fully opaque')))
})