/**
 * Wrapper for the notifications widget, for view outside the popup.
 *
 * @class
 * @extends OO.ui.Widget
 * @mixes OO.ui.mixin.PendingElement
 *
 * @constructor
 * @param {mw.echo.Controller} controller Echo controller
 * @param {mw.echo.dm.ModelManager} model Notifications model manager
 * @param {Object} [config={}]
 * @param {jQuery} [config.$overlay] A jQuery element functioning as an overlay
 *  for popups.
 */
mw.echo.ui.NotificationsWrapper = function MwEchoUiNotificationsWrapper( controller, model, config ) {
	config = config || {};

	// Parent constructor
	mw.echo.ui.NotificationsWrapper.super.call( this, config );

	// Mixin constructor
	OO.ui.mixin.PendingElement.call( this, config );

	this.controller = controller;
	this.model = model;

	this.notificationsWidget = new mw.echo.ui.NotificationsListWidget(
		this.controller,
		this.model,
		{
			$overlay: config.$overlay,
			types: this.controller.getTypes(),
			label: mw.msg( 'notifications' ),
			icon: 'bell'
		}
	);

	// Initialize
	this.$element
		.addClass( 'mw-echo-notificationsWrapper skin-invert' )
		.append( this.notificationsWidget.$element );
};

/* Initialization */

OO.inheritClass( mw.echo.ui.NotificationsWrapper, OO.ui.Widget );
OO.mixinClass( mw.echo.ui.NotificationsWrapper, OO.ui.mixin.PendingElement );

/* Events */

/**
 * Notifications have successfully finished being processed and are fully loaded
 *
 * @event mw.echo.ui.NotificationsWrapper#finishLoading
 */

/* Methods */

/**
 * Populate the notifications panel
 *
 * @return {jQuery.Promise} A promise that is resolved when all notifications
 *  were fetched from the API and added to the model and UI.
 * @fires mw.echo.ui.NotificationsWrapper#finishLoading
 */
mw.echo.ui.NotificationsWrapper.prototype.populate = function () {
	this.pushPending();
	return this.controller.fetchLocalNotifications( true )
		.catch( ( errorObj ) => {
			if ( errorObj.errCode === 'notlogin-required' ) {
				// Login required message
				this.notificationsWidget.resetLoadingOption( mw.msg( 'echo-notification-loginrequired' ) );
			} else {
				// Generic API failure message
				this.notificationsWidget.resetLoadingOption( mw.msg( 'echo-api-failure' ) );
			}
		} )
		.always( () => {
			this.popPending();
			this.emit( 'finishLoading' );
			this.promiseRunning = false;
		} );
};
