server.js

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

const PORT = 5000;
const HOST = '0.0.0.0';

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

const server = http.createServer((req, res) => {
  // Parse URL and remove query params
  let filePath = req.url.split('?')[0];
  
  // Default to index.html for root
  if (filePath === '/') {
    filePath = '/index.html';
  }
  
  // Remove leading slash and resolve path
  const fullPath = path.join(__dirname, filePath.substring(1));
  
  // Get file extension
  const ext = path.extname(fullPath).toLowerCase();
  const contentType = mimeTypes[ext] || 'text/plain';
  
  // Check if file exists
  fs.access(fullPath, fs.constants.F_OK, (err) => {
    if (err) {
      // File not found - try serving index.html for SPA routing
      const indexPath = path.join(__dirname, 'index.html');
      fs.readFile(indexPath, (err, content) => {
        if (err) {
          res.writeHead(404, { 'Content-Type': 'text/plain' });
          res.end('404 Not Found');
        } else {
          res.writeHead(200, { 
            'Content-Type': 'text/html',
            'Cache-Control': 'no-cache, no-store, must-revalidate',
            'Pragma': 'no-cache',
            'Expires': '0'
          });
          res.end(content);
        }
      });
      return;
    }
    
    // File exists, serve it
    fs.readFile(fullPath, (err, content) => {
      if (err) {
        res.writeHead(500, { 'Content-Type': 'text/plain' });
        res.end('500 Internal Server Error');
        return;
      }
      
      // Set headers with cache control
      res.writeHead(200, { 
        'Content-Type': contentType,
        'Cache-Control': 'no-cache, no-store, must-revalidate',
        'Pragma': 'no-cache',
        'Expires': '0'
      });
      res.end(content);
    });
  });
});

server.listen(PORT, HOST, () => {
  console.log(`Marcus Savings Tracker server running at http://${HOST}:${PORT}/`);
  console.log('Serving static files with cache disabled for development');
});

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

// Graceful shutdown
process.on('SIGTERM', () => {
  console.log('Received SIGTERM, shutting down gracefully');
  server.close(() => {
    console.log('Server closed');
    process.exit(0);
  });
});

process.on('SIGINT', () => {
  console.log('Received SIGINT, shutting down gracefully');
  server.close(() => {
    console.log('Server closed');
    process.exit(0);
  });
});