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

// Create a test server to demonstrate POST requests
const server = http.createServer((req, res) => {
  if (req.method === 'POST') {
    let body = [];
    
    // Collect request data
    req.on('data', (chunk) => {
      body.push(chunk);
    }).on('end', () => {
      body = Buffer.concat(body).toString();
      
      // Parse the request body based on content type
      let parsedBody = {};
      const contentType = req.headers['content-type'] || '';
      
      try {
        if (contentType.includes('application/json')) {
          parsedBody = JSON.parse(body);
        } else if (contentType.includes('application/x-www-form-urlencoded')) {
          parsedBody = querystring.parse(body);
        } else {
          parsedBody = { raw: body };
        }
      } catch (e) {
        parsedBody = { error: 'Failed to parse request body', raw: body };
      }
      
      // Prepare response
      const responseData = {
        status: 'success',
        method: req.method,
        url: req.url,
        headers: req.headers,
        body: parsedBody
      };
      
      // Send JSON response
      res.writeHead(200, { 'Content-Type': 'application/json' });
      res.end(JSON.stringify(responseData, null, 2));
    });
  } else {
    res.writeHead(405, { 'Content-Type': 'application/json' });
    res.end(JSON.stringify({ 
      status: 'error',
      message: 'Method Not Allowed. Use POST.' 
    }));
  }
});

// Start the server
const PORT = 3005;
server.listen(PORT, () => {
  console.log(`Test server running at http://localhost:${PORT}`);
  
  // Test data
  const postData = {
    name: 'John Doe',
    email: 'john@example.com',
    message: 'This is a test message from the demo',
    timestamp: new Date().toISOString()
  };
  
  // Convert data to JSON string
  const jsonData = JSON.stringify(postData);
  
  // Make a POST request with JSON data
  console.log('\nMaking a POST request with JSON data...');
  
  const options = {
    hostname: 'localhost',
    port: PORT,
    path: '/api/data',
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Content-Length': Buffer.byteLength(jsonData),
      'X-Request-ID': 'demo-12345'
    }
  };
  
  const req = http.request(options, (res) => {
    console.log(`\nResponse Status: ${res.statusCode} ${res.statusMessage}`);
    console.log('Response Headers:', JSON.stringify(res.headers, null, 2));
    
    let responseData = '';
    res.setEncoding('utf8');
    
    res.on('data', (chunk) => {
      responseData += chunk;
    });
    
    res.on('end', () => {
      console.log('\nResponse Body:');
      console.log(responseData);
      
      // Close the server after receiving the response
      server.close(() => {
        console.log('\nTest server closed');
      });
    });
  });
  
  // Handle request errors
  req.on('error', (e) => {
    console.error(`Request error: ${e.message}`);
    server.close();
  });
  
  // Write data to request body
  req.write(jsonData);
  req.end();
});

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