#!/usr/bin/env node
/**
 * scripts/vendor.mjs —— 把 lit 系依赖 vendor 到 lib/vendor/（方案 B：本地兜底）。
 *
 * 为什么 vendor：Repose 依赖仓（/npm/importmap/lit-v3.json）在 repose.fmode.cn /
 * kangshifu.fmode.cn / app.fmode.cn 三个域名实测都是 404，见 README「依赖走哪条路」。
 *
 * 做的事：
 *   1. npm pack 每个包（不 npm install，不留 node_modules）
 *   2. 解到 lib/vendor/<name>/v<version>/，去掉 .ts / .js.map / src / development / node 等非运行时目录
 *   3. 校验每个包的 package.json main 指向的入口文件真实存在
 *
 * 可重复执行：先删后写，结果由 VENDOR 表唯一决定。
 * 用法：node scripts/vendor.mjs [--offline <tgz目录>]
 */
import { execFileSync } from 'node:child_process';
import { mkdtempSync, rmSync, mkdirSync, readFileSync, existsSync, cpSync, readdirSync, statSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';

export const VENDOR = [
  { name: 'lit', version: '3.3.3' },
  { name: 'lit-html', version: '3.3.3' },
  { name: 'lit-element', version: '4.2.2' },
  { name: '@lit/reactive-element', version: '2.1.2' },
  { name: '@lit/context', version: '1.1.6' },
  { name: '@lit-labs/signals', version: '0.3.0' },
  { name: 'signal-polyfill', version: '0.2.2' },
];

const ROOT = join(dirname(fileURLToPath(import.meta.url)), '..');
const OUT = join(ROOT, 'lib/vendor');
/** 运行时用不到的目录/文件：源码、类型、调试版、Node 专用实现 */
const DROP = [
  /\/development\//, /\/node\//, /\/src\//, /\/decorators\//, /\/test\//,
  /\.ts$/, /\.d\.ts$/, /\.js\.map$/, /\.tsbuildinfo$/, /\/cjs\//,
];
const offlineIdx = process.argv.indexOf('--offline');
const offlineDir = offlineIdx > -1 ? process.argv[offlineIdx + 1] : null;

function tgzName(name, version) {
  return `${name.replace('/', '-').replace('@', '')}-${version}.tgz`;
}

function findTgz(name, version, dir) {
  const direct = join(dir, `${name.replace(/^@/, '').replace('/', '-')}-${version}.tgz`);
  if (existsSync(direct)) return direct;
  const fallback = join(dir, tgzName(name, version));
  if (existsSync(fallback)) return fallback;
  return null;
}

const work = mkdtempSync(join(tmpdir(), 'kf-vendor-'));
let failed = 0;
rmSync(OUT, { recursive: true, force: true });
mkdirSync(OUT, { recursive: true });

for (const pkg of VENDOR) {
  const id = `${pkg.name}@${pkg.version}`;
  let tgz = offlineDir ? findTgz(pkg.name, pkg.version, offlineDir) : null;
  if (!tgz) {
    // 不带路径输出，避免把文件落在 cwd
    const fetched = execFileSync('npm', ['pack', id, '--silent', '--pack-destination', work], { encoding: 'utf8' }).trim().split('\n').pop();
    tgz = join(work, fetched);
  }
  const stage = join(work, pkg.name.replace(/[/@]/g, '_') + '-' + pkg.version);
  mkdirSync(stage, { recursive: true });
  execFileSync('tar', ['xzf', tgz, '-C', stage]);

  const dest = join(OUT, pkg.name, `v${pkg.version}`);
  mkdirSync(dest, { recursive: true });
  cpSync(join(stage, 'package'), dest, {
    recursive: true,
    filter: (src) => {
      if (!src.startsWith(stage)) return true;
      const rel = '/' + src.slice(join(stage, 'package').length).replace(/^[/\\]/, '').replace(/\\/g, '/');
      return !DROP.some((re) => re.test(rel + '/'));
    },
  });

  const pj = JSON.parse(readFileSync(join(dest, 'package.json'), 'utf8'));
  if (pj.version !== pkg.version) {
    console.error(`✗ ${id}: 包内版本是 ${pj.version}`);
    failed++;
    continue;
  }
  // 入口文件必须存在（importmap 指向的就是它）
  const entries = new Set();
  const ex = pj.exports?.['.'];
  if (typeof ex === 'string') entries.add(ex);
  else if (ex?.import?.default) entries.add(ex.import.default);
  else if (ex?.default) entries.add(ex.default);
  if (pj.main) entries.add(pj.main);
  const missing = [...entries].filter((e) => !existsSync(join(dest, e)));
  if (missing.length) {
    console.error(`✗ ${id}: 入口不存在 ${missing.join(', ')}`);
    failed++;
    continue;
  }
  const size = du(dest);
  console.log(`✓ ${id} → lib/vendor/${pkg.name}/v${pkg.version}/ (${entries.values().next().value}, ${size})`);
}

rmSync(work, { recursive: true, force: true });
console.log(failed ? `\nVENDOR FAILED（${failed}）` : '\nVENDOR OK');
process.exit(failed ? 1 : 0);

function du(dir) {
  let n = 0;
  for (const e of readdirSync(dir)) {
    const p = join(dir, e);
    const s = statSync(p);
    n += s.isDirectory() ? du(p) : s.size;
  }
  return `${Math.round(n / 1024) || "<1"} KB`;
}