app.js

const express = require('express');
const helmet = require('helmet');
const path = require('path');

const app = express();
const PORT = process.env.PORT || 3000;

// Security middleware
app.use(helmet());

// Middleware
app.use(express.static('public'));
app.use(express.json());

// Routes
app.get('/', (req, res) => {
  res.sendFile(path.join(__dirname, 'public', 'index.html'));
});

app.get('/health', (req, res) => {
  res.status(200).json({
    status: 'healthy',
    timestamp: new Date().toISOString(),
    version: process.env.npm_package_version || '1.0.0'
  });
});

app.get('/api/info', (req, res) => {
  res.json({
    message: 'DevOps Portfolio Application',
    environment: process.env.NODE_ENV || 'development',
    version: process.env.npm_package_version || '1.0.0',
    hostname: require('os').hostname()
  });
});

// Error handling
app.use((req, res) => {
  res.status(404).json({ error: 'Route not found' });
});

app.use((err, req, res, _next) => {
  console.error(err.stack);
  res.status(500).json({ error: 'Something went wrong!' });
});

// Only start server if this file is run directly
if (require.main === module) {
  const server = app.listen(PORT, () => {
    console.log(`Server running on port ${PORT}`);
    console.log(`Environment: ${process.env.NODE_ENV || 'development'}`);
  });

  // Graceful shutdown
  process.on('SIGTERM', () => {
    console.log('SIGTERM received, shutting down gracefully');
    server.close(() => {
      console.log('Process terminated');
    });
  });
}

module.exports = app;