const fs = require('fs');
const path = require('path');

const ROOT = __dirname;
const pkg = require('./package.json');
const OUT = process.env.PEOPLELIB_OUT_DIR
  ? path.resolve(process.env.PEOPLELIB_OUT_DIR)
  : path.join(ROOT, 'dist', `PeopleLib-${pkg.version}`);
const APP = path.join(OUT, 'resources', 'app');
const PRODUCT = 'PeopleLib';

function rimraf(p) { if (fs.existsSync(p)) fs.rmSync(p, { recursive: true, force: true }); }
function copyDir(src, dst, skip) {
  fs.mkdirSync(dst, { recursive: true });
  for (const e of fs.readdirSync(src, { withFileTypes: true })) {
    if (skip && skip(e)) continue;
    const s = path.join(src, e.name);
    const d = path.join(dst, e.name);
    if (e.isDirectory()) copyDir(s, d, skip);
    else fs.copyFileSync(s, d);
  }
}

function pruneLocales(dir) {
  const keep = new Set(['zh-CN.pak', 'en-US.pak']);
  for (const name of fs.readdirSync(dir)) {
    if (!keep.has(name)) fs.unlinkSync(path.join(dir, name));
  }
}

function skipDevFiles(e) {
  const name = e.name.toLowerCase();
  if (e.isDirectory()) return false;
  if (/\.(d\.ts|d\.ts\.map|ts|tsx|map|flow)$/.test(name)) return true;
  if (/^(readme|changelog|history|license|licence|notice|authors|contributing|security)/.test(name)) return true;
  if (/\.(md|markdown)$/.test(name)) return true;
  return false;
}

function copyUndici(dst) {
  const src = path.join(ROOT, 'node_modules', 'undici');
  fs.mkdirSync(dst, { recursive: true });
  for (const name of ['package.json', 'index.js', 'index-fetch.js', 'LICENSE']) {
    const file = path.join(src, name);
    if (fs.existsSync(file)) fs.copyFileSync(file, path.join(dst, name));
  }
  copyDir(path.join(src, 'lib'), path.join(dst, 'lib'), skipDevFiles);
}

console.log('清理输出目录...');
rimraf(OUT);

console.log('复制 Electron 运行时...');
copyDir(path.join(ROOT, 'node_modules', 'electron', 'dist'), OUT);

console.log('精简语言包...');
pruneLocales(path.join(OUT, 'locales'));

console.log('重命名可执行文件...');
fs.renameSync(path.join(OUT, 'electron.exe'), path.join(OUT, PRODUCT + '.exe'));
rimraf(path.join(OUT, 'resources', 'default_app.asar'));

console.log('组装 app 源码...');
fs.mkdirSync(APP, { recursive: true });
fs.copyFileSync(path.join(ROOT, 'main.js'), path.join(APP, 'main.js'));
fs.copyFileSync(path.join(ROOT, 'preload.js'), path.join(APP, 'preload.js'));
copyDir(path.join(ROOT, 'src'), path.join(APP, 'src'), (e) => e.name.startsWith('_test'));
copyUndici(path.join(APP, 'node_modules', 'undici'));

fs.writeFileSync(path.join(APP, 'package.json'), JSON.stringify({
  name: pkg.name, version: pkg.version, description: pkg.description,
  main: 'main.js', author: pkg.author, license: pkg.license,
  dependencies: { undici: pkg.dependencies.undici }
}, null, 2));

console.log('\n构建完成:');
console.log('  目录:', OUT);
console.log('  可执行文件:', path.join(OUT, PRODUCT + '.exe'));