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

const PORT = 3000;
const PUBLIC_DIR = path.join(__dirname, 'public');

const server = http.createServer((req, res) => {
  let filePath = path.join(PUBLIC_DIR, req.url === '/' ? 'index.html' : req.url);
  
  // Set CORS headers for PWA
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS');
  res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
  
  // Set cache headers for icons and manifest
  if (req.url.includes('.png') || req.url.includes('.json') || req.url.includes('.svg')) {
    res.setHeader('Cache-Control', 'public, max-age=31536000');
  }
  
  const ext = path.extname(filePath);
  const contentTypes = {
    '.html': 'text/html',
    '.js': 'text/javascript',
    '.css': 'text/css',
    '.json': 'application/json',
    '.png': 'image/png',
    '.jpg': 'image/jpeg',
    '.svg': 'image/svg+xml',
    '.ico': 'image/x-icon',
    '.woff': 'font/woff',
    '.woff2': 'font/woff2',
  };
  
  const contentType = contentTypes[ext] || 'application/octet-stream';
  
  fs.readFile(filePath, (err, content) => {
    if (err) {
      if (err.code === 'ENOENT') {
        res.writeHead(404, { 'Content-Type': 'text/html' });
        res.end('<h1>404 Not Found</h1>');
      } else {
        res.writeHead(500);
        res.end(`Server Error: ${err.code}`);
      }
    } else {
      res.writeHead(200, { 'Content-Type': contentType });
      res.end(content, 'utf-8');
    }
  });
});

server.listen(PORT, () => {
  console.log(`PWA Server running at http://localhost:${PORT}`);
});