import { test } from 'node:test';
import assert from 'node:assert/strict';
import { join } from 'node:path';
import { mkdirSync, writeFileSync, rmSync, mkdtempSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { deflateSync } from 'node:zlib';
import { checkSkin } from '../check-skin.mjs';

function crc32(buf) {
  let c = ~0;
  for (const x of buf) { c ^= x; for (let i = 0; i < 8; i++) c = (c >>> 1) ^ (0xEDB88320 & -(c & 1)); }
  return ~c >>> 0;
}
function chunk(type, data) {
  const len = Buffer.alloc(4); len.writeUInt32BE(data.length);
  const td = Buffer.concat([Buffer.from(type, 'ascii'), data]);
  const c = Buffer.alloc(4); c.writeUInt32BE(crc32(td));
  return Buffer.concat([len, td, c]);
}
function makePng(w, h) {
  const ihdr = Buffer.alloc(13);
  ihdr.writeUInt32BE(w, 0); ihdr.writeUInt32BE(h, 4); ihdr[8] = 8; ihdr[9] = 2;
  const raw = Buffer.alloc(h * (1 + w * 3));
  return Buffer.concat([
    Buffer.from([137, 80, 78, 71, 13, 10, 26, 10]),
    chunk('IHDR', ihdr), chunk('IDAT', deflateSync(raw)), chunk('IEND', Buffer.alloc(0)),
  ]);
}
function put(dir, rel, content) {
  const p = join(dir, ...rel.split('/'));
  mkdirSync(join(p, '..'), { recursive: true });
  writeFileSync(p, content);
}

function scaffold() {
  const root = mkdtempSync(join(tmpdir(), 'youle-checkskin-'));
  const frameworkUiDir = join(root, 'ui');
  const gamesDir = join(root, 'games');
  mkdirSync(frameworkUiDir, { recursive: true });
  mkdirSync(join(gamesDir, 'demo', 'assets', 'game', 'override'), { recursive: true });
  put(frameworkUiDir, 'atlas-hall/btn.png', makePng(64, 64));
  put(frameworkUiDir, 'atlas-hall/bg.png', makePng(64, 64));
  return { root, frameworkUiDir, gamesDir, overrideDir: join(gamesDir, 'demo', 'assets', 'game', 'override') };
}

test('checkSkin 统计命中数与框架资源总数', () => {
  const s = scaffold();
  try {
    put(s.overrideDir, 'atlas-hall/btn.png', makePng(64, 64));
    const r = checkSkin('demo', { gamesDir: s.gamesDir, frameworkUiDir: s.frameworkUiDir });
    assert.deepEqual(r.errors, []);
    assert.deepEqual(r.matched, ['atlas-hall/btn.png']);
    assert.equal(r.frameworkTotal, 2);
  } finally { rmSync(s.root, { recursive: true, force: true }); }
});

test('checkSkin 报出孤儿 override', () => {
  const s = scaffold();
  try {
    put(s.overrideDir, 'atlas-hall/nope.png', makePng(64, 64));
    const r = checkSkin('demo', { gamesDir: s.gamesDir, frameworkUiDir: s.frameworkUiDir });
    assert.equal(r.errors.length, 1);
    assert.equal(r.errors[0].code, 'orphan');
  } finally { rmSync(s.root, { recursive: true, force: true }); }
});

test('checkSkin 对不存在的子游戏抛错', () => {
  const s = scaffold();
  try {
    assert.throws(
      () => checkSkin('nosuch', { gamesDir: s.gamesDir, frameworkUiDir: s.frameworkUiDir }),
      /找不到子游戏工程/,
    );
  } finally { rmSync(s.root, { recursive: true, force: true }); }
});

test('checkSkin 对没有 override 目录的子游戏返回零命中而非报错', () => {
  const s = scaffold();
  try {
    rmSync(s.overrideDir, { recursive: true, force: true });
    const r = checkSkin('demo', { gamesDir: s.gamesDir, frameworkUiDir: s.frameworkUiDir });
    assert.deepEqual(r.matched, []);
    assert.deepEqual(r.errors, []);
  } finally { rmSync(s.root, { recursive: true, force: true }); }
});