// server.js - IIS Node.js Proxy for React + .NET Backend
const express = require('express');
const path = require('path');
const { createProxyMiddleware } = require('http-proxy-middleware');

const app = express();
const PORT = process.env.PORT || 3001;
const isProduction = process.env.NODE_ENV === 'production';

// Configuration
const config = {
  distPath: path.join(__dirname, 'Update Common - Vignesh', 'dist'),
  dotnetApiUrl: process.env.DOTNET_API_URL || 'http://localhost:5000'
};

console.log('🚀 Starting PozoApp Server...');
console.log('📦 Environment:', isProduction ? 'Production' : 'Development');
console.log('📁 Serving React from:', config.distPath);

// Middleware - Serve static files from React build
app.use(express.static(config.distPath, {
  maxAge: isProduction ? '1d' : 0,
  etag: true
}));

// Proxy .NET API calls
app.use('/api', createProxyMiddleware({
  target: config.dotnetApiUrl,
  changeOrigin: true,
  pathRewrite: {
    '^/api': '/api'  // Keep /api prefix
  },
  onProxyReq: (proxyReq, req, res) => {
    console.log('🔗 API Proxy:', req.method, req.url, '→', config.dotnetApiUrl);
  },
  onError: (err, req, res) => {
    console.error('❌ Proxy error:', err.message);
    res.status(500).send('Backend API unavailable');
  }
}));

// Health check endpoint
app.get('/health', (req, res) => {
  res.json({ 
    status: 'OK', 
    environment: process.env.NODE_ENV,
    timestamp: new Date().toISOString()
  });
});

// React SPA - Handle all frontend routes
// Clean URLs without /home/ prefix
const reactRoutes = [
  '/',
  '/blog',
  '/pricing',
  '/contact-us',
  '/signin',
  '/faq',
  '/testimonials',
  '/privacy-policy',
  '/cookie-policy',
  '/about-us',
  '/live-session',
  '/adminpanel',
  '/landing-page/*',
  '/setting/*',
  '/:appName'  // Dynamic app routes (bakery, restaurant, etc.)
];

// Serve index.html for all non-API routes
app.get('*', (req, res) => {
  const indexPath = path.join(config.distPath, 'index.html');
  
  // Log for debugging
  console.log('📄 Serving React SPA for:', req.url);
  
  res.sendFile(indexPath, (err) => {
    if (err) {
      console.error('❌ Error serving index.html:', err);
      res.status(500).send('Error loading application');
    }
  });
});

// Error handling
app.use((err, req, res, next) => {
  console.error('❌ Server Error:', err);
  res.status(500).send('Internal Server Error');
});

// Start server
app.listen(PORT, () => {
  console.log(`✅ PozoApp Server listening on port ${PORT}`);
  console.log(`🌐 Access at: http://localhost:${PORT}`);
  console.log(`📊 Clean URLs enabled (no /home/ prefix)`);
});

// Graceful shutdown
process.on('SIGTERM', () => {
  console.log('🛑 SIGTERM received, shutting down gracefully...');
  process.exit(0);
});