// Simple Express server for more reliable deployment
const express = require('express');
const next = require('next');
const path = require('path');

// Set up environment variables with defaults
const dev = process.env.NODE_ENV !== 'production';
const port = parseInt(process.env.PORT || '3000', 10);

// Create the Next.js app instance with minimal configuration
const app = next({ dev });
const handle = app.getRequestHandler();

// Log memory usage for debugging
const logMemoryUsage = () => {
  const memoryUsage = process.memoryUsage();
  console.log('Memory usage:');
  console.log(`  RSS: ${Math.round(memoryUsage.rss / 1024 / 1024)} MB`);
  console.log(`  Heap total: ${Math.round(memoryUsage.heapTotal / 1024 / 1024)} MB`);
  console.log(`  Heap used: ${Math.round(memoryUsage.heapUsed / 1024 / 1024)} MB`);
};

// Handle uncaught exceptions
process.on('uncaughtException', (err) => {
  console.error('Uncaught exception:', err);
  logMemoryUsage();
});

process.on('unhandledRejection', (reason, promise) => {
  console.error('Unhandled Rejection at:', promise, 'reason:', reason);
  logMemoryUsage();
});

// Simple health check response
const healthCheck = (req, res) => {
  res.status(200).json({ status: 'ok', timestamp: new Date().toISOString() });
};

app.prepare()
  .then(() => {
    const server = express();
    
    // Add health check endpoint
    server.get('/health', healthCheck);
    server.get('/api/health', healthCheck);
    
    // Serve static files from the public directory
    server.use(express.static(path.join(__dirname, 'public')));
    
    // Let Next.js handle all other routes
    server.all('*', (req, res) => {
      return handle(req, res);
    });
    
    // Start the server
    server.listen(port, '0.0.0.0', (err) => {
      if (err) throw err;
      console.log(`> Ready on port ${port} - env ${process.env.NODE_ENV || 'development'}`);
      logMemoryUsage();
    });
  })
  .catch((ex) => {
    console.error('An error occurred starting the app:', ex);
    logMemoryUsage();
    process.exit(1);
  });