server.js

const express = require('express');
const cors = require('cors');
const helmet = require('helmet');
const morgan = require('morgan');
const dotenv = require('dotenv');
const { connectDB } = require('./config/database');

// Load environment variables
dotenv.config();

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

// Connect to database
connectDB();

// Security Middleware
app.use(cors({
  origin: '*', // Allows access from all origins

}));

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

// Logging Middleware
if (process.env.NODE_ENV === 'development') {
  app.use(morgan('dev'));
}



// Import Routes
const authRoutes = require('./routes/auth');
const vendorRoutes = require('./routes/vendor');
const contractRoutes = require('./routes/contract');
const purchaseOrderRoutes = require('./routes/purchaseOrder');
const budgetRoutes = require('./routes/budget');
const performanceRoutes = require('./routes/performance');
// const departmentRoutes = require('./routes/department');

// API Routes
app.use('/api/auth', authRoutes);
app.use('/api/vendors', vendorRoutes);
app.use('/api/contracts', contractRoutes);
app.use('/api/purchase-orders', purchaseOrderRoutes);
app.use('/api/budgets', budgetRoutes);
app.use('/api/performance', performanceRoutes);
// app.use('/api/departments', departmentRoutes);



// Global Error Handler
app.use((err, req, res, next) => {
  console.error(err.stack);
  
  const statusCode = err.statusCode || 500;
  const status = err.status || 'error';
  
  res.status(statusCode).json({
    status: status,
    message: err.message,
    ...(process.env.NODE_ENV === 'development' && { stack: err.stack })
  });
});

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

// Graceful shutdown handling
process.on('SIGTERM', () => {
  console.log('SIGTERM received. Shutting down gracefully...');
  server.close(() => {
    console.log('Process terminated!');
  });
});

// Start server
const PORT = process.env.PORT || 5000;
const server = app.listen(PORT, () => {
  console.log(`
    ================================================
    🚀 Server running in ${process.env.NODE_ENV} mode on port ${PORT}
    ================================================
  `);
});

// Handle unhandled promise rejections
process.on('unhandledRejection', (err) => {
  console.log('UNHANDLED REJECTION! 💥 Shutting down...');
  console.error(err);
  server.close(() => {
    process.exit(1);
  });
});

module.exports = app; // For testing purposes