// 临时静态服务器（仅用于本机预览 _design-test 产物）
// 用法: node _design-test/serve.js [port]
const http = require('http');
const fs = require('fs');
const path = require('path');

const ROOT = path.resolve(__dirname, '..');
const PORT = Number(process.argv[2] || 55501);
const MIME = {
  '.html': 'text/html; charset=utf-8', '.js': 'text/javascript; charset=utf-8',
  '.css': 'text/css; charset=utf-8', '.json': 'application/json; charset=utf-8',
  '.svg': 'image/svg+xml', '.png': 'image/png', '.jpg': 'image/jpeg', '.woff2': 'font/woff2'
};

http.createServer((req, res) => {
  // 供浏览器栅格化后回传 PNG 落盘（仅允许写入 _design-test/logo/ 下）
  if (req.method === 'POST' && req.url.indexOf('/__save') === 0) {
    const rel = decodeURIComponent((req.url.split('path=')[1] || ''));
    const base = path.join(ROOT, '_design-test', 'logo');
    const dest = path.join(base, rel);
    if (!dest.startsWith(base)) { res.writeHead(403).end('forbidden'); return; }
    const chunks = [];
    req.on('data', c => chunks.push(c));
    req.on('end', () => {
      fs.mkdirSync(path.dirname(dest), { recursive: true });
      fs.writeFileSync(dest, Buffer.concat(chunks));
      res.writeHead(200, { 'Content-Type': 'text/plain' });
      res.end('ok ' + rel + ' ' + Buffer.concat(chunks).length + 'B');
    });
    return;
  }
  let p = decodeURIComponent(req.url.split('?')[0]);
  if (p === '/') p = '/_design-test/zhenfang-logo-picker.html';
  let file = path.join(ROOT, p);
  if (!fs.existsSync(file) && fs.existsSync(path.join(ROOT, '_design-test', p))) {
    file = path.join(ROOT, '_design-test', p); // 允许直接用 /xxx.html 访问 _design-test 下的产物
  }
  if (!file.startsWith(ROOT)) { res.writeHead(403).end('forbidden'); return; }
  fs.readFile(file, (err, buf) => {
    if (err) { res.writeHead(404).end('not found: ' + p); return; }
    res.writeHead(200, { 'Content-Type': MIME[path.extname(file).toLowerCase()] || 'application/octet-stream' });
    res.end(buf);
  });
}).listen(PORT, () => console.log('serving ' + ROOT + ' at http://localhost:' + PORT + '/'));