// 本地预览 dist/：按线上路径挂在 /app 下（/app 和 /app/ 都返回首页）
import http from 'node:http';
import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const DIST = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..', 'dist');
const PORT = Number(process.env.PORT) || 8080;
const TYPES = {
  '.html': 'text/html; charset=utf-8', '.css': 'text/css; charset=utf-8', '.js': 'text/javascript; charset=utf-8',
  '.svg': 'image/svg+xml', '.webp': 'image/webp', '.png': 'image/png', '.jpg': 'image/jpeg',
  '.apk': 'application/vnd.android.package-archive',
};

http.createServer((req, res) => {
  const url = decodeURIComponent(req.url.split('?')[0]);
  if (url === '/') { res.writeHead(302, { Location: '/app' }); return res.end(); }
  if (url !== '/app' && !url.startsWith('/app/')) {
    res.writeHead(404, { 'Content-Type': 'text/plain; charset=utf-8' });
    return res.end(`本地预览只包含 /app，${url} 属于线上商城`);
  }
  let file = path.join(DIST, url.slice(4));
  if (!file.startsWith(DIST)) { res.writeHead(403); return res.end(); }
  if (fs.existsSync(file) && fs.statSync(file).isDirectory()) file = path.join(file, 'index.html');
  if (!fs.existsSync(file)) { res.writeHead(404); return res.end('Not Found'); }
  res.writeHead(200, { 'Content-Type': TYPES[path.extname(file)] || 'application/octet-stream' });
  fs.createReadStream(file).pipe(res);
}).listen(PORT, () => console.log(`本地预览：http://localhost:${PORT}/app`));