unction validateInput(data, otherValidation) {
    let { errors } = otherValidation(data);
    console.log(errors);
    console.log('sprawdzam');
    const {
        username,
        firstName,
        lastName,
        email,
        password,
        passwordConfirmation,
    } = data;

    return User.find({
        $or: [
            {
                userName: username,
            },
            {
                email: email,
            },
        ],
    }).then(user => {
        console.log(user);
        if (user.length) {
            if (user[0].userName === username) {
                errors.username = 'Przepraszamy, Login jest już zajęty.';
                console.log('Login zajety');
            }
            if (user[0].email === email) {
                errors.email = 'E-mail został juz wykorzystany';
                console.log('email zajety');
            }
        }
        console.log('nie ma takiego usera');
        return {
            errors,
            isValid: isEmpty(errors),
        };
    });
}



passport.use(
    'local-signup',
    new LocalStrategy(
        {
            usernameField: 'email',
            passwordField: 'password',
            passReqToCallback: true,
        },
        function(req, email, password, done) {
            process.nextTick(function() {

                validateInput(req.body, validator.validateInput).then(
                    ({ errors, isValid }) => {
                        //tu mi nie wchodzi w ogóle
                        console.log(isValid);
                        if (isValid) {
                            const {
                                username,
                                firstName,
                                lastName,
                                email,
                                password,
                                passwordConfirmation,
                            } = req.body;

                            const user = new User({
                                email: email,
                                password: user.generateHash(password),
                                firstName: firstName,
                                lastName: lastName,
                                userName: username,
                                role: 'student',
                            });

                            user.save(function(err) {
                                if (err) {
                                    console.log(err);
                                }

                                return done(null, user);
                            });
                        } else {
                            return done(errors);
                        }
                    }
                );
            });
        }
    )
);