// Example: How to integrate the logging client in your service

import express from 'express';
import { createLoggingClient } from '../src/client/index.js';

// Initialize logging client
const logger = createLoggingClient({
  serviceName: 'api-gateway',
  redisHost: 'localhost',
  redisPort: 6379,
  logLevel: 'info'
});

// Create Express app
const app = express();

// Use logging middleware
app.use(logger.expressMiddleware());

// Example route with logging
app.get('/api/users/:id', async (req, res) => {
  try {
    // Log the operation
    await logger.info('Fetching user', {
      userId: req.params.id,
      requestedBy: req.user?.id
    });

    // Simulate fetching user
    const user = { id: req.params.id, name: 'John Doe' };

    // Send metric
    await logger.metric('user_fetch_success', 1, {
      userId: req.params.id
    });

    res.json(user);
  } catch (error) {
    // Log error
    await logger.error(error, {
      userId: req.params.id,
      operation: 'user_fetch'
    });

    res.status(500).json({ error: 'Internal server error' });
  }
});

// Example of logging different levels
async function exampleLogging() {
  // Debug logging
  await logger.debug('Debug message', { detail: 'some debug info' });

  // Info logging
  await logger.info('User logged in', { userId: 'user123' });

  // Warning logging
  await logger.warn('API rate limit approaching', {
    userId: 'user123',
    current: 95,
    limit: 100
  });

  // Error logging
  try {
    throw new Error('Database connection failed');
  } catch (error) {
    await logger.error(error, {
      database: 'mongodb',
      host: 'localhost'
    });
  }

  // Metrics
  await logger.metric('api_requests', 1, {
    endpoint: '/api/users',
    method: 'GET'
  });

  await logger.metric('response_time', 234.5, {
    endpoint: '/api/users',
    method: 'GET'
  });

  await logger.metric('memory_usage', process.memoryUsage().heapUsed / 1024 / 1024, {
    unit: 'MB'
  });
}

// Run examples
exampleLogging();

// Start server
app.listen(3000, () => {
  logger.info('API Gateway started', { port: 3000 });
});

// Graceful shutdown
process.on('SIGTERM', async () => {
  await logger.info('Shutting down service');
  await logger.close();
  process.exit(0);
});