/*
 * 构建脚本
 * 功能：
 *   1. 使用 terser 将 ckplayer/js/ckplayer.js 压缩为 ckplayer.min.js
 *   2. 从 node_modules 拷贝运行时依赖(hls.js/flv.js/mpegts.js)到 ckplayer/ 对应目录
 *      播放器运行时会按需动态加载这些文件,目录结构需与 getPath() 的约定保持一致
 * 用法：npm run build
 */
const fs = require('fs');
const path = require('path');
const terser = require('terser');

const root = path.resolve(__dirname, '..');

// 运行时依赖拷贝清单：[npm包名, 产物目录, 需要拷贝的文件]
const libs = [
  ['hls.js', 'hls.js', ['hls.min.js', 'hls.min.js.map', 'LICENSE']],
  ['flv.js', 'flv.js', ['flv.min.js', 'flv.min.js.map', 'LICENSE']],
  ['mpegts.js', 'mpegts.js', ['mpegts.js', 'mpegts.js.map', 'LICENSE']]
];

async function minifyCore() {
  const src = path.join(root, 'ckplayer/js/ckplayer.js');
  const dist = path.join(root, 'ckplayer/js/ckplayer.min.js');
  const code = fs.readFileSync(src, 'utf8');
  const result = await terser.minify(code, {
    output: {
      // 保留文件头部的版权注释
      comments: /^!|软件名称|版权/
    }
  });
  if (result.error) {
    throw result.error;
  }
  fs.writeFileSync(dist, result.code, 'utf8');
  console.log('压缩完成: ckplayer/js/ckplayer.min.js (' + result.code.length + ' bytes)');
}

function copyLibs() {
  for (const [pkg, dir, files] of libs) {
    const pkgRoot = path.dirname(require.resolve(pkg + '/package.json'));
    const targetDir = path.join(root, 'ckplayer', dir);
    // 清空旧的 vendored 文件,只保留构建拷贝的产物
    fs.rmSync(targetDir, { recursive: true, force: true });
    fs.mkdirSync(targetDir, { recursive: true });
    for (const file of files) {
      const from = path.join(pkgRoot, 'dist', file);
      // LICENSE 在包根目录而非 dist 目录
      const fromAlt = path.join(pkgRoot, file);
      const src = fs.existsSync(from) ? from : fromAlt;
      fs.copyFileSync(src, path.join(targetDir, file));
    }
    const version = require(pkg + '/package.json').version;
    console.log('拷贝完成: ckplayer/' + dir + '/ (' + pkg + '@' + version + ')');
  }
}

(async () => {
  await minifyCore();
  copyLibs();
  console.log('构建完成');
})().catch(err => {
  console.error('构建失败:', err);
  process.exit(1);
});