const express = require('express');
const router = express.Router();

// Health check endpoint
router.get('/', (req, res) => {
  const healthcheck = {
    status: 'ok',
    uptime: process.uptime(),
    message: 'OK',
    timestamp: Date.now(),
    environment: process.env.NODE_ENV || 'development',
    version: process.env.npm_package_version || '1.0.0',
    service: 'UAM-ILS Drone Detection System'
  };

  try {
    res.status(200).json(healthcheck);
  } catch (error) {
    healthcheck.status = 'error';
    healthcheck.message = error;
    res.status(503).json(healthcheck);
  }
});

// Detailed health check with database connection
router.get('/detailed', async (req, res) => {
  const healthcheck = {
    uptime: process.uptime(),
    message: 'OK',
    timestamp: Date.now(),
    environment: process.env.NODE_ENV || 'development',
    version: process.env.npm_package_version || '1.0.0',
    services: {}
  };

  try {
    // Check database connection
    const { sequelize } = require('../models');
    await sequelize.authenticate();
    healthcheck.services.database = 'connected';

    // Check Redis connection (if configured)
    if (process.env.REDIS_HOST) {
      // Add Redis check if implemented
      healthcheck.services.redis = 'not_implemented';
    }

    res.status(200).json(healthcheck);
  } catch (error) {
    healthcheck.message = 'Service Unavailable';
    healthcheck.services.database = 'disconnected';
    healthcheck.error = error.message;
    res.status(503).json(healthcheck);
  }
});

module.exports = router;