server.js

const express = require('express');
const mongoose = require('mongoose');
const cors = require('cors');
const path = require('path');
require('dotenv').config();

const app = express();

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

// MongoDB Connection
const MONGODB_URI = process.env.MONGODB_URI || 'mongodb://localhost:27017/student_feedback';

mongoose.connect(MONGODB_URI, {
  useNewUrlParser: true,
  useUnifiedTopology: true,
})
.then(() => console.log('MongoDB connected successfully'))
.catch(err => console.log('MongoDB connection error:', err));

// Routes
app.use('/api/students', require('./routes/students'));
app.use('/api/feedback', require('./routes/feedback'));
app.use('/api/ai', require('./routes/ai'));

// Serve static assets in production
if (process.env.NODE_ENV === 'production') {
  app.use(express.static('client/build'));
  
  app.get('*', (req, res) => {
    res.sendFile(path.resolve(__dirname, 'client', 'build', 'index.html'));
  });
}

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

app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});