import http from 'http';
import fs from 'fs';
import path from 'path';

const port = process.env.PORT ? Number(process.env.PORT) : 5174;
const staticDir = path.resolve(process.cwd(), './static');

const mime = {
  '.html': 'text/html',
  '.js': 'application/javascript',
  '.css': 'text/css',
  '.json': 'application/json',
  '.png': 'image/png',
};

const server = http.createServer((req, res) => {
  try {
    const reqPath = req.url === '/' ? '/sender.html' : req.url;
    const filePath = path.join(staticDir, decodeURIComponent(reqPath));
    if (!filePath.startsWith(staticDir)) {
      res.writeHead(403); res.end('Forbidden'); return;
    }
    if (fs.existsSync(filePath) && fs.statSync(filePath).isFile()) {
      const ext = path.extname(filePath);
      res.writeHead(200, { 'Content-Type': mime[ext] || 'text/plain' });
      fs.createReadStream(filePath).pipe(res);
    } else {
      res.writeHead(404); res.end('Not found');
    }
  } catch (e) {
    res.writeHead(500); res.end('Server error');
  }
});

server.listen(port, () => {
  console.log(`Static server running on http://localhost:${port}`);
});

// Graceful shutdown
process.on('SIGINT', () => server.close(() => process.exit(0)));
process.on('SIGTERM', () => server.close(() => process.exit(0)));