// egg-compat-patch.js
// 批量扫描并修复 egg.js v3 在 Node 22 下的全部缺失依赖
const fs = require('fs');
const path = require('path');

const BASE = path.resolve(__dirname, 'node_modules');

// === 已知缺失依赖 + shim 内容 ===
const SHIMS = {
  'serialize-json': {
    package: { name: 'serialize-json', version: '2.0.0', main: 'index.js' },
    index: `'use strict';
// shim: serialize-json → native JSON
module.exports = JSON;
module.exports.parse = JSON.parse;
module.exports.stringify = JSON.stringify;
`
  },
  'sdk-base': {
    package: { name: 'sdk-base', version: '4.0.0', main: 'index.js' },
    index: `'use strict';
const EventEmitter = require('events');
class Base extends EventEmitter {
  constructor(opts) { super(); this.options = opts || {}; }
  ready(cb) { if (cb) cb(); return Promise.resolve(); }
}
module.exports = Base;
`
  },
  'tcp-base': {
    package: { name: 'tcp-base', version: '4.0.0', main: 'index.js' },
    index: `'use strict';
const sdkBase = require('sdk-base');
class TCPBase extends sdkBase {
  constructor(opts) { super(opts); }
  async close() {}
  async connect() {}
}
module.exports = TCPBase;
`
  },
  'await-first': {
    package: { name: 'await-first', version: '1.0.0', main: 'index.js' },
    index: `'use strict';
module.exports = async function awaitFirst(emitter, event) {
  return new Promise((resolve) => {
    emitter.once(event, resolve);
  });
};
`
  },
  'co': {
    package: { name: 'co', version: '4.6.0', main: 'index.js' },
    index: `'use strict';
// co shim: use Promise for basic generator support
module.exports = function co(gen) {
  if (typeof gen === 'function') gen = gen();
  if (!gen || typeof gen.next !== 'function') return Promise.resolve(gen);
  return new Promise((resolve, reject) => {
    function step(next) {
      try {
        const result = next();
        if (result.done) return resolve(result.value);
        Promise.resolve(result.value).then(v => step(() => gen.next(v)), e => step(() => gen.throw(e)));
      } catch (e) { reject(e); }
    }
    step(() => gen.next());
  });
};
`
  },
};

// 创建所有 shim
for (const [name, files] of Object.entries(SHIMS)) {
  const dir = path.join(BASE, name);
  if (fs.existsSync(dir)) {
    console.log(`[SKIP] ${name} already exists`);
    continue;
  }
  fs.mkdirSync(dir, { recursive: true });
  fs.writeFileSync(path.join(dir, 'package.json'), JSON.stringify(files.package, null, 2));
  fs.writeFileSync(path.join(dir, 'index.js'), files.index);
  console.log(`[CREATED] ${name}`);
}

console.log('\n=== 补丁应用完成 ===');