import fs from 'node:fs/promises';
import path from 'node:path';

const projectRoot = process.cwd();

const distDir = path.join(projectRoot, 'dist');
const deployDir = path.join(projectRoot, 'deploy_bundle');
const deployWebDir = path.join(deployDir, 'web');
const deployServerDir = path.join(deployDir, 'server');

const exists = async (p) => {
  try {
    await fs.access(p);
    return true;
  } catch {
    return false;
  }
};

const ensureDir = async (p) => {
  await fs.mkdir(p, { recursive: true });
};

const emptyDir = async (p) => {
  await fs.rm(p, { recursive: true, force: true });
  await fs.mkdir(p, { recursive: true });
};

const copyDir = async (src, dest) => {
  await fs.cp(src, dest, { recursive: true });
};

const copyFile = async (src, dest) => {
  await ensureDir(path.dirname(dest));
  await fs.copyFile(src, dest);
};

if (!(await exists(distDir))) {
  throw new Error('未找到 dist/。请先执行：npm run build');
}

// 1) web: dist/ 下除 api/ 之外所有内容
await emptyDir(deployWebDir);

const distEntries = await fs.readdir(distDir, { withFileTypes: true });
for (const entry of distEntries) {
  if (entry.name === 'api') continue;
  const src = path.join(distDir, entry.name);
  const dest = path.join(deployWebDir, entry.name);
  if (entry.isDirectory()) {
    await copyDir(src, dest);
  } else {
    await copyFile(src, dest);
  }
}

// 2) server: dist/api -> deploy_bundle/server/dist/api
await ensureDir(deployServerDir);
await ensureDir(path.join(deployServerDir, 'dist'));

const distApiDir = path.join(distDir, 'api');
if (!(await exists(distApiDir))) {
  throw new Error('未找到 dist/api/。请确认 npm run build 已成功执行（包含 scripts/build-api.mjs）。');
}

await emptyDir(path.join(deployServerDir, 'dist', 'api'));
await copyDir(distApiDir, path.join(deployServerDir, 'dist', 'api'));

// 3) 同步 server 运行所需文件
await copyFile(path.join(projectRoot, 'package.json'), path.join(deployServerDir, 'package.json'));
if (await exists(path.join(projectRoot, 'package-lock.json'))) {
  await copyFile(path.join(projectRoot, 'package-lock.json'), path.join(deployServerDir, 'package-lock.json'));
}

// ecosystem.config.cjs：以仓库根目录为准同步（如需环境差异，可在服务器上覆盖 env/cwd）
if (await exists(path.join(projectRoot, 'ecosystem.config.cjs'))) {
  await copyFile(path.join(projectRoot, 'ecosystem.config.cjs'), path.join(deployServerDir, 'ecosystem.config.cjs'));
}

// sanity check
const initSql = path.join(deployServerDir, 'dist', 'api', 'database', 'init.sql');
if (!(await exists(initSql))) {
  throw new Error('缺少 deploy_bundle/server/dist/api/database/init.sql（postbuild 应该会复制）。');
}

console.log('deploy_bundle 已生成：');
console.log('- deploy_bundle/web');
console.log('- deploy_bundle/server');