const express = require('express');
const { Pool } = require('pg');
const redis = require('redis');
const path = require('path');

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

// PostgreSQL connection
const pool = new Pool({
  host: process.env.POSTGRES_HOST || 'postgres',
  port: process.env.POSTGRES_PORT || 5432,
  user: process.env.POSTGRES_USER || 'postgres',
  password: process.env.POSTGRES_PASSWORD || 'postgres',
  database: process.env.POSTGRES_DB || 'postgres'
});

// Redis connection
const redisClient = redis.createClient({
  socket: {
    host: process.env.REDIS_HOST || 'redis',
    port: process.env.REDIS_PORT || 6379
  }
});

// Connect to Redis
redisClient.connect().catch(console.error);

// Test database connections
pool.query('SELECT NOW()', (err, res) => {
  if (err) {
    console.error('PostgreSQL connection error:', err);
  } else {
    console.log('PostgreSQL connected successfully at:', res.rows[0].now);
  }
});

redisClient.on('connect', () => {
  console.log('Redis connected successfully');
});

redisClient.on('error', (err) => {
  console.error('Redis connection error:', err);
});

// Serve static files
app.use(express.static('public'));

// Health check endpoint
app.get('/health', async (req, res) => {
  try {
    const pgResult = await pool.query('SELECT NOW()');
    await redisClient.ping();
    res.json({
      status: 'healthy',
      postgres: 'connected',
      redis: 'connected',
      timestamp: pgResult.rows[0].now,
      git_commit: process.env.GIT_COMMIT || 'unknown',
      version: process.env.APP_VERSION || '1.0.0'
    });
  } catch (error) {
    res.status(500).json({
      status: 'unhealthy',
      error: error.message,
      git_commit: process.env.GIT_COMMIT || 'unknown',
      version: process.env.APP_VERSION || '1.0.0'
    });
  }
});

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

app.listen(PORT, '0.0.0.0', () => {
  console.log(`Server running on port ${PORT}`);
});