import express from 'express';
import cors from 'cors';
import helmet from 'helmet';
import morgan from 'morgan';
import { mastra } from '../mastra';
import { agentRouter } from './routes/agent-routes';
import { responseFormatter } from './middleware/response-formatter';
import { errorHandler, notFoundHandler } from './middleware/error-handler';

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

// Security middleware
app.use(helmet());

// CORS configuration
app.use(cors({
  origin: process.env.CORS_ORIGIN || '*',
  methods: ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'],
  allowedHeaders: ['Content-Type', 'Authorization'],
}));

// Logging middleware
app.use(morgan('combined'));

// Body parsing middleware
app.use(express.json({ limit: '10mb' }));
app.use(express.urlencoded({ extended: true, limit: '10mb' }));

// Response formatting middleware
app.use(responseFormatter);

// Routes
app.use('/api/agent', agentRouter);

// Health check endpoint
app.get('/health', (req, res) => {
  res.json({
    status: 'ok',
    timestamp: new Date().toISOString(),
    service: 'Multi-Function Agent API',
    version: '1.0.0'
  });
});

// Root endpoint
app.get('/', (req, res) => {
  res.json({
    message: 'Multi-Function Agent API',
    endpoints: {
      health: '/health',
      agentInfo: '/api/agent',
      generate: '/api/agent/generate',
      stream: '/api/agent/stream',
      testTools: '/api/agent/test-tools'
    },
    documentation: 'See API documentation for usage details'
  });
});

// 404 handler - catch all unmatched routes
app.use(notFoundHandler);

// Error handling middleware - must be last
app.use(errorHandler);

// Start server
const server = app.listen(PORT, () => {
  console.log(`🚀 Express server listening on port ${PORT}`);
  console.log(`📡 Health check: http://localhost:${PORT}/health`);
  console.log(`🤖 Agent API: http://localhost:${PORT}/api/agent`);
});

// Graceful shutdown
process.on('SIGTERM', () => {
  console.log('SIGTERM received, shutting down gracefully');
  server.close(() => {
    console.log('Server closed');
    process.exit(0);
  });
});

process.on('SIGINT', () => {
  console.log('SIGINT received, shutting down gracefully');
  server.close(() => {
    console.log('Server closed');
    process.exit(0);
  });
});

export default app;