const http = require('http');

// Create an HTTP server
const server = http.createServer((req, res) => {
  // 'req' is the IncomingMessage object (request)
  console.log('Request URL:', req.url);
  console.log('Request Method:', req.method);
  console.log('HTTP Version:', req.httpVersion);
  
  // Headers
  console.log('Headers:', req.headers);
  console.log('User-Agent:', req.headers['user-agent']);
  
  // Raw headers with keys and values as separate array elements
  console.log('Raw Headers:', req.rawHeaders);
  
  // Socket information
  console.log('Remote Address:', req.socket.remoteAddress);
  console.log('Remote Port:', req.socket.remotePort);
  
  // Reading the message body (if any)
  let body = [];
  req.on('data', (chunk) => {
    body.push(chunk);
  });
  
  req.on('end', () => {
    body = Buffer.concat(body).toString();
    console.log('Request body:', body);
    
    // Now that we have the body, send a response
    res.writeHead(200, { 'Content-Type': 'application/json' });
    res.end(JSON.stringify({
      httpVersion: req.httpVersion,
      method: req.method,
      url: req.url,
      headers: req.headers,
      body: body || null
    }));
  });
  
  // Handle errors
  req.on('error', (err) => {
    console.error('Request error:', err);
    res.statusCode = 400;
    res.end('Error: ' + err.message);
  });
});

// Start server
const PORT = 8080;
server.listen(PORT, () => {
  console.log(`Server running at http://localhost:${PORT}/`);
  
  // Make a test request
  const testReq = http.request({
    hostname: 'localhost',
    port: PORT,
    path: '/test?param1=value1¶m2=value2',
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Custom-Header': 'Custom Value'
    }
  }, (res) => {
    let responseData = '';
    
    res.on('data', (chunk) => {
      responseData += chunk;
    });
    
    res.on('end', () => {
      console.log('Test request response:', JSON.parse(responseData));
      server.close();
    });
  });
  
  testReq.on('error', (err) => {
    console.error('Test request error:', err);
    server.close();
  });
  
  testReq.end('{"message":"Hello from the client!"}');
});

// Handle server errors
server.on('error', (err) => {
  console.error('Server error:', err);
});