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

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

	var $el = jQuery('#content');
	var template;

	function init() {
		topNavigationPresenter.select('register');
		util.loadTemplate('registration-form').then(function(html) {
			template = _.template(html);
			render();
		});
	}

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

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

		registrationData = {
			userName: $el.find('[name=user]').val(),
			password: $el.find('[name=password1]').val(),
			passwordConfirmation: $el.find('[name=password2]').val(),
			email: $el.find('[name=email]').val(),
		};

		if (!validateRegistrationData(registrationData))
			return;

		api.post('/users', registrationData)
			.then(function(response) {
				registrationSuccess(response);
			}).catch(function(response) {
				registrationFailure(response);
			});
	}

	function registrationSuccess(apiResponse) {
		//todo: tell user if it turned out that he needs to confirm his e-mail
		$el.find('form').slideUp(function() {
			var message = 'Registration complete! ';
			message += '<a href="#/login">Click here</a> to login.';
			messagePresenter.showInfo($messages, message);
		});
	}

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

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

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

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

		return true;
	};

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

};

App.DI.register('registrationPresenter', App.Presenters.RegistrationPresenter);