import { HttpApp } from '../src/infra/http/http-app';
import { MetricsPlugin, MetricsPluginOptions } from '../src/infra/http/metrics';
import { GetRoute } from '../src/infra/http/route';

// Example usage of MetricsPlugin
async function metricsPluginExample() {
  // Create HTTP app
  const app = new HttpApp();
  
  // Configure metrics plugin options
  const metricsOptions: MetricsPluginOptions = {
    enabled: true,
    exposeEndpoint: true,
    metricsPath: '/metrics',
    metricsFormat: 'prometheus', // or 'json' or 'text'
    includeSystemMetrics: true,
    metrics: {
      responseTime: true,
      requestCount: true,
      errorRate: true,
      memoryUsage: true,
      cpuUsage: true
    },
    collectInterval: 30000, // 30 seconds
    includeRouteParams: false,
    customLabels: {
      environment: 'development',
      service: 'example-app'
    }
  };
  
  // Create and install metrics plugin
  const metricsPlugin = new MetricsPlugin(metricsOptions);
  
  // Install the plugin
  app.usePlugin(metricsPlugin);
  
  // Add some test routes
  app.mount(new GetRoute('/api/users', async (req, res) => {
    res.json({ users: ['user1', 'user2', 'user3'] });
  }));
  
  app.mount(new GetRoute('/api/posts', async (req, res) => {
    res.json({ posts: ['post1', 'post2'] });
  }));
  
  // Add a route that might cause errors for testing error metrics
  app.mount(new GetRoute('/api/error', async (req, res) => {
    res.status(500).json({ error: 'Internal server error' });
  }));
  
  // Start the server
  await app.start(3000);
  
  console.log('Server started on port 3000');
  console.log('Available endpoints:');
  console.log('  GET /api/users - Get users');
  console.log('  GET /api/posts - Get posts');
  console.log('  GET /api/error - Test error metrics');
  console.log('  GET /metrics - View collected metrics (Prometheus format)');
  
  // Example of custom metrics
  const collector = metricsPlugin.getCollector();
  
  // Record custom business metrics
  collector.counter('business_operations_total', 1, { operation: 'user_login' });
  collector.histogram('business_operation_duration_seconds', 0.5, { operation: 'user_login' });
  collector.gauge('active_users', 42);
  
  console.log('\nCustom metrics recorded:');
  console.log('- business_operations_total');
  console.log('- business_operation_duration_seconds');
  console.log('- active_users');
  
  // Graceful shutdown
  process.on('SIGINT', async () => {
    console.log('\nShutting down server...');
    await app.stop();
    process.exit(0);
  });
}

// Run the example
if (require.main === module) {
  metricsPluginExample().catch(console.error);
}

export { metricsPluginExample };