const express = require('express');
const cors = require('cors');
const { createClient } = require('redis');
const analyticsRoutes = require('./routes/analytics.routes');

const app = express();
const port = process.env.GOOGLE_ANALYTICS_PORT || 3007;

// Redis client setup
const redisClient = createClient({
  url: process.env.REDIS_URL || 'redis://localhost:6379'
});

redisClient.on('error', (err) => console.error('Redis Client Error:', err));
redisClient.on('connect', () => console.log('Redis Client Connected'));

// Connect to Redis
(async () => {
  try {
    await redisClient.connect();
  } catch (err) {
    console.error('Redis connection error:', err);
  }
})();

// Middleware
app.use(cors());
app.use(express.json());

// Make Redis client available in requests
app.use((req, res, next) => {
  req.redisClient = redisClient;
  next();
});

// Routes
app.use('/api/analytics', analyticsRoutes);

// Error handling middleware
app.use((err, req, res, next) => {
  console.error('Server error:', err);
  res.status(err.status || 500).json({
    success: false,
    message: err.message || 'Internal server error',
    error: process.env.NODE_ENV === 'production' ? err : {}
  });
});

// Start server
app.listen(port, () => {
  console.log(`Google Analytics server running on port ${port}`);
});

// Handle graceful shutdown
process.on('SIGTERM', async () => {
  console.log('SIGTERM received. Shutting down gracefully...');
  await redisClient.quit();
  process.exit(0);
});

process.on('SIGINT', async () => {
  console.log('SIGINT received. Shutting down gracefully...');
  await redisClient.quit();
  process.exit(0);
});