var App = App || {};
App.Presenters = App.Presenters || {};

App.Presenters.RegistrationPresenter = function(
    jQuery,
    util,
    promise,
    api,
    topNavigationPresenter,
    messagePresenter) {

    var $el = jQuery('#content');
    var templates = {};
    var $messages;

    function init(params, loaded) {
        topNavigationPresenter.select('register');
        topNavigationPresenter.changeTitle('Registration');
        promise.wait(util.promiseTemplate('registration-form'))
            .then(function(template) {
                templates.registration = template;
                render();
                loaded();
            }).fail(function() {
                console.log(arguments);
                loaded();
            });
    }

    function render() {
        $el.html(templates.registration());
        $el.find('form').submit(registrationFormSubmitted);
        $messages = $el.find('.messages');
        $messages.width($el.find('form').width());
    }

    function registrationFormSubmitted(e) {
        e.preventDefault();
        messagePresenter.hideMessages($messages);

        var formData = {
            userName: $el.find('[name=userName]').val(),
            password: $el.find('[name=password]').val(),
            passwordConfirmation: $el.find('[name=passwordConfirmation]').val(),
            email: $el.find('[name=email]').val(),
        };

        if (!validateRegistrationFormData(formData)) {
            return;
        }

        promise.wait(api.post('/users', formData))
            .then(function(response) {
                registrationSuccess(response);
            }).fail(function(response) {
                registrationFailure(response);
            });
    }

    function registrationSuccess(apiResponse) {
        $el.find('form').slideUp(function() {
            var message = 'Registration complete! ';
            if (!apiResponse.json.user.confirmed) {
                message += '<br/>Check your inbox for activation e-mail.<br/>If e-mail doesn\'t show up, check your spam folder.';
            } else {
                message += '<a href="#/login">Click here</a> to login.';
            }
            messagePresenter.showInfo($messages, message);
        });
    }

    function registrationFailure(apiResponse) {
        messagePresenter.showError($messages, apiResponse.json && apiResponse.json.error || apiResponse);
    }

    function validateRegistrationFormData(formData) {
        if (formData.userName.length === 0) {
            messagePresenter.showError($messages, 'User name cannot be empty.');
            return false;
        }

        if (formData.password.length === 0) {
            messagePresenter.showError($messages, 'Password cannot be empty.');
            return false;
        }

        if (formData.password !== formData.passwordConfirmation) {
            messagePresenter.showError($messages, 'Passwords must be the same.');
            return false;
        }

        return true;
    }

    return {
        init: init,
        render: render,
    };

};

App.DI.register('registrationPresenter', ['jQuery', 'util', 'promise', 'api', 'topNavigationPresenter', 'messagePresenter'], App.Presenters.RegistrationPresenter);
