const express = require('express');
const cors = require('cors');
const helmet = require('helmet');
const morgan = require('morgan');
const http = require('http');
const socketIo = require('socket.io');
require('dotenv').config();

const connectDB = require('./config/database');
const authRoutes = require('./routes/auth');
const chatRoutes = require('./routes/chat');
const conversationRoutes = require('./routes/conversations');
const { initializeSocket } = require('./services/socketService');
const rateLimitMiddleware = require('./middleware/rateLimit');

// Connect to database
connectDB();

const app = express();
const server = http.createServer(app);
const io = socketIo(server, {
  cors: {
    origin: process.env.CORS_ORIGIN || "http://localhost:3000",
    methods: ["GET", "POST"]
  }
});

// Initialize Socket.IO
initializeSocket(io);

// Middleware
app.use(helmet());
app.use(cors({
  origin: process.env.CORS_ORIGIN || "http://localhost:3000",
  credentials: true
}));
app.use(morgan('combined'));
app.use(express.json({ limit: '10mb' }));
app.use(express.urlencoded({ extended: true }));
app.use(rateLimitMiddleware);

// Routes
app.use('/api/auth', authRoutes);
app.use('/api/chat', chatRoutes);
app.use('/api/conversations', conversationRoutes);

// Health check
app.get('/api/health', (req, res) => {
  res.json({ status: 'OK', timestamp: new Date().toISOString() });
});

// Error handling middleware
app.use((err, req, res, next) => {
  console.error(err.stack);
  res.status(500).json({ 
    error: 'Something went wrong!',
    message: process.env.NODE_ENV === 'development' ? err.message : 'Internal server error'
  });
});

// 404 handler
app.use('*', (req, res) => {
  res.status(404).json({ error: 'Route not found' });
});

const PORT = process.env.PORT || 5000;

server.listen(PORT, () => {
  console.log(`🚀 Server running on port ${PORT}`);
  console.log(`📱 Environment: ${process.env.NODE_ENV}`);
});

module.exports = { app, server };