const http = require('http');
const fs = require('fs');
const path = require('path');
const port = process.env.PORT || 5000;

const mimeTypes = {
  '.html': 'text/html',
  '.js': 'text/javascript',
  '.css': 'text/css',
  '.json': 'application/json',
  '.png': 'image/png',
  '.jpg': 'image/jpeg',
  '.gif': 'image/gif',
  '.svg': 'image/svg+xml',
  '.ico': 'image/x-icon'
};

const server = http.createServer((req, res) => {
  let filePath = '.' + req.url;
  if (filePath === './') filePath = './index.html';
  
  const extname = path.extname(filePath).toLowerCase();
  const contentType = mimeTypes[extname] || 'application/octet-stream';
  
  fs.readFile(filePath, (error, content) => {
    if (error) {
      if (error.code === 'ENOENT') {
        res.writeHead(404);
        res.end('File not found');
      } else {
        res.writeHead(500);
        res.end('Server error');
      }
    } else {
      res.writeHead(200, { 'Content-Type': contentType });
      res.end(content, 'utf-8');
    }
  });
});

server.listen(port, '0.0.0.0', () => {
  console.log(`Server running at http://localhost:${port}/`);
});