app.js

// Import dependencies
const express = require('express');
const bodyParser = require('body-parser');
const cookieParser = require('cookie-parser');
const dotenv = require('dotenv');
const mongoose = require('mongoose');
const path = require('path');
const session = require('express-session');
const MongoStore = require('connect-mongo');
const cors = require('cors');
const helmet = require('helmet');

// Load environment variables
dotenv.config();

const COOKIE_TIME = parseInt(process.env.MAX_AGE, 10);

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

// Middleware setup
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(cookieParser());
app.use(cors());
app.use(helmet());

//url 
app.use((req,res,next)=>{
  console.log(req.url)
  next();
});

// View engine setup
app.set('view engine', 'ejs');
app.set('views', path.join(__dirname, 'views'));

// Database connection
mongoose.connect(process.env.MONGO_URI)
  .then(() => console.log('Connected to MongoDB'))
  .catch(err => console.error('Database connection error:', err));

// Session setup
app.use(
  session({
    secret: process.env.SESSION_SECRET,
    resave: false,
    saveUninitialized: false,
    store: MongoStore.create({
      mongoUrl: process.env.MONGO_URI,
      collectionName: 'sessions',
      ttl:  COOKIE_TIME/1000, 
      stringify: false,
    }),
    cookie: {
      secure: process.env.NODE_ENV === 'production',
      httpOnly: true,
      maxAge:  COOKIE_TIME, 
      sameSite: 'lax',
    },
  })
);

// Import routes
const authRoutes = require('./routes/authRoutes');

// Mount routes
app.use('/auth', authRoutes);       

// Default route
app.get('/', (req, res) => {
  res.send('Welcome to the Authentication Project');
});

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

// Start the server
app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});