server.js

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

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

app.use(express.json());

// Logging middleware
app.use((req, res, next) => {
  console.log(`[${new Date().toISOString()}] ${req.method} ${req.url}`);
  next();
});

// Connect to MongoDB
mongoose.connect(process.env.MONGODB_URI, {
  useNewUrlParser: true,
  useUnifiedTopology: true,
  serverSelectionTimeoutMS: 5000,
  socketTimeoutMS: 45000,
})
.then(() => console.log('Connected to MongoDB'))
.catch(err => {
  console.error('MongoDB connection error:', err);
  process.exit(1);
});

// Routes
app.use('/api/users', require('./routes/userRoutes'));
app.use('/api/folders', require('./routes/folderRoutes'));
app.use('/api/notes', require('./routes/noteRoutes'));

// Error handling middleware
app.use((err, req, res, next) => {
  console.error(`[${new Date().toISOString()}] Error:`, err);
  res.status(500).json({ message: 'An unexpected error occurred' });
});

function startServer(port) {
  app.listen(port, () => console.log(`Server running on port ${port}`))
    .on('error', (err) => {
      if (err.code === 'EADDRINUSE') {
        console.log(`Port ${port} is busy, trying ${port + 1}`);
        startServer(port + 1);
      } else {
        console.error(err);
      }
    });
}

startServer(PORT);
module.exports = app;