const path = require('path');
const express = require('express');
const dotenv = require('dotenv');
const cors = require('cors');
const morgan = require('morgan');
const fs = require('fs');
const { connectDB, sequelize } = require('./config/db');

// Load env variables
dotenv.config();

// Import route files
const userRoutes = require('./routes/userRoutes');
const gymClassRoutes = require('./routes/gymClassRoutes');
const bookingRoutes = require('./routes/bookingRoutes');
const uploadRoutes = require('./routes/uploadRoutes');

// Initialize express app
const app = express();

// Middleware
app.use(express.json());
app.use(cors());

// Dev logging middleware
if (process.env.NODE_ENV === 'development') {
  app.use(morgan('dev'));
}

// Create uploads directory if it doesn't exist
const uploadsDir = path.join(__dirname, 'uploads');
if (!fs.existsSync(uploadsDir)) {
  fs.mkdirSync(uploadsDir, { recursive: true });
}

// Set static folder for uploads
app.use('/uploads', express.static(path.join(__dirname, 'uploads')));

// Mount routers
app.use('/api/users', userRoutes);
app.use('/api/classes', gymClassRoutes);
app.use('/api/bookings', bookingRoutes);
app.use('/api/upload', uploadRoutes);

// Root route
app.get('/', (req, res) => {
  res.json({ message: 'Welcome to Gym API' });
});

// Error handling middleware
app.use((err, req, res, next) => {
  console.error(err.stack);
  res.status(500).json({
    message: 'Server Error',
    error: err.message
  });
});

// Define port
const PORT = process.env.PORT || 3000;

// Connect to database and start server
const startServer = async () => {
  try {
    // Connect to database
    await connectDB();
    
    await sequelize.sync();
    console.log('Database synchronized');
    
    // Start server
    app.listen(PORT, () => {
      console.log(`Server running in ${process.env.NODE_ENV} mode on port ${PORT}`);
    });
  } catch (error) {
    console.error('Unable to start server:', error);
    process.exit(1);
  }
};

startServer();

// Handle unhandled promise rejections
process.on('unhandledRejection', (err) => {
  console.log(`Error: ${err.message}`);
  // Close server & exit process
  process.exit(1);
});