var userList = (function () {

    function User(username, password) {
        if (((typeof username === 'string') && (username.length > 1)) && ((password.match(/\d+/)) && (password.match(/[A-Z]/)) && (password.match(/[a-z]/)))) {
            this.username = username;
            this.password = password;
            this.watchedMovies = [];
            this.likedMovies = [];
        } else {
            $('#pas').css('display', 'inline');
        }
    }


    function UserList() {
        if (localStorage.getItem('users') != null) {
            this._users = JSON.parse(localStorage.getItem('users'));
        } else {
            this._users = [new User('ponko', 'Ponko1234')];
            localStorage.setItem('users', JSON.stringify(this._users));
        }
    }

    UserList.prototype.addUser = function (username, password) {
        if (!(this._users.find(function (user) {
            if ((user.username === username) && (Object.keys(user).length > 0)) {
                this._users.push(new User(username, password));
                localStorage.setItem('users', JSON.stringify(this._users));
            }
        })));
    }

    UserList.prototype.login = function (username, password) {
        return this._users.find(user => username === user.username && password === user.password);
    }
    return new UserList();
})();