app.js

const express = require('express');
const mongoose = require('mongoose');
const bodyparser = require('body-parser');
const session = require('express-session');
const mongoDbStore = require('connect-mongodb-session')(session);
require('dotenv').config();


const uri = process.env.MONGO_URI;
const secret_key = process.env.SESSION_SECRET ; 

const User = require('./models/user');
const authRoutes = require('./routes/auth');
const noteRoutes = require('./routes/notes');
const is_auth = require('./middlewares/is_auth');
const STATUS_CODES = require('./utils/status_codes');

const app = express();

app.use(express.json());

if (!uri) {
    console.error('MONGO_URI is not set. Add it to your .env file.');
    process.exit(1);
}

const store = new mongoDbStore({
    uri: uri,
    collection: 'sessions'
});

app.use(session({
    secret: secret_key,
    resave: false,
    saveUninitialized: false,
    store: store
}));


app.use((req, res, next) => {
    if (req.session.isLoggedIn) {
        User.findById(req.session.userId._id).then(
            user => {
                if (user) req.user = user;
            }
        ).then(
            _ => next()
        ).catch( err => next(err) );
    } else {
        next();
    }


})


app.use(authRoutes);
app.use(is_auth, noteRoutes)
app.use((err, req, res, next) => {
  console.error('ERROR:', err);

  const status = err.status || STATUS_CODES.INTERNAL_SERVER_ERROR;
  const message = err.message || 'Internal Server Error';

  res.status(status).json({
    message
  });
});


mongoose.connect(uri)
    .then(
        () => {
            console.log("Connection established ");
            app.listen(process.env.PORT || 3000 );
        }
    ).catch(err => console.log(err));