const http = require('http');
const https = require('https');

// Get the default global agents
const defaultHttpAgent = http.globalAgent;
const defaultHttpsAgent = https.globalAgent;

// Create a custom HTTP agent
const customHttpAgent = new http.Agent({
  keepAlive: true,
  maxSockets: 25,
  keepAliveMsecs: 10000, // Keep sockets around for 10 seconds (default: 1000)
  maxFreeSockets: 10,   // Maximum number of free sockets to keep open
  timeout: 60000        // Socket timeout in milliseconds
});

// Create a custom HTTPS agent
const customHttpsAgent = new https.Agent({
  keepAlive: true,
  maxSockets: 25,
  rejectUnauthorized: true, // Reject unauthorized TLS certificates
  // Additional TLS options can be specified here
  // e.g., key, cert, ca, etc.
});

// Log agent configurations
console.log('=== Default HTTP Agent ===');
console.log('maxSockets:', defaultHttpAgent.maxSockets);
console.log('maxFreeSockets:', defaultHttpAgent.maxFreeSockets);
console.log('keepAlive:', defaultHttpAgent.keepAlive);

console.log('\n=== Custom HTTP Agent ===');
console.log('maxSockets:', customHttpAgent.maxSockets);
console.log('maxFreeSockets:', customHttpAgent.maxFreeSockets);
console.log('keepAliveMsecs:', customHttpAgent.keepAliveMsecs);
console.log('timeout:', customHttpAgent.timeout);

console.log('\n=== Default HTTPS Agent ===');
console.log('maxSockets:', defaultHttpsAgent.maxSockets);
console.log('rejectUnauthorized:', defaultHttpsAgent.options.rejectUnauthorized);

// Example of using the custom agent with a request
console.log('\n=== Example: Using Custom Agent ===');

// Create a test server to demonstrate agent usage
const server = http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.end('Hello from the test server!');
});

// Start the server on a random port
server.listen(0, 'localhost', () => {
  const port = server.address().port;
  const url = `http://localhost:${port}`;
  
  console.log(`\nTest server running at ${url}`);
  
  // Make a request using the custom agent
  const req = http.get({
    hostname: 'localhost',
    port: port,
    path: '/',
    agent: customHttpAgent // Use our custom agent
  }, (res) => {
    console.log(`\nResponse status: ${res.statusCode}`);
    console.log('Response headers:', JSON.stringify(res.headers, null, 2));
    
    let data = '';
    res.on('data', (chunk) => {
      data += chunk;
    });
    
    res.on('end', () => {
      console.log('Response body:', data);
      
      // Check agent stats
      console.log('\nAgent stats after request:');
      console.log('Free sockets:', Object.keys(customHttpAgent.freeSockets).length);
      console.log('Active sockets:', Object.keys(customHttpAgent.sockets).length);
      
      // Close the server and destroy the agent
      server.close(() => {
        customHttpAgent.destroy();
        console.log('\nTest server closed and agent destroyed');
      });
    });
  });
  
  // Handle request errors
  req.on('error', (err) => {
    console.error('Request error:', err);
    server.close();
    customHttpAgent.destroy();
  });
});

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