register new user

// register a new user
router.post('/register', async (req, res) => {
    console.log(req.body);
    const { fullname, email, password, password2 } = req.body;
    const errors = [];

    // check for required fields
    if (!fullname || !email || !password || !password2) {
        errors.push({ message: 'Please fill in all fields!' });
    }

    // check passwords match
    if (password !== password2) {
        errors.push({ message: 'The passwords do not match!' });
    }

    // check if password isn't too short
    if (password.length < 8) {
        errors.push({ message: 'Password must be at least 8 characters long!' });
    }

    if (errors.length > 0) {
        res.render('register', { errors, fullname, email, password, password2 });
    } else {
        let user;
        // check if user already exists
        user = await User.findOne({ email: email });
        if (user) {
            errors.push({ message: 'User already exists. Please login.' });
            // redirect to login page
            res.redirect('/login');
        } else {
            // register new user
            user = new User({ fullname, email, password });
        }

        console.log(user);
        res.send('registration is done!');

    }

});