/*
 * This code loads the necessary modules for the notifications overlay, not to be confused
 * with the Toast notifications defined by common/toast.js.
 */
( function ( M ) {
	var mainMenu = M.require( 'skins.minerva.scripts.top/mainMenu' ),
		router = require( 'mediawiki.router' ),
		NotificationBadge = M.require( 'skins.minerva.notifications/NotificationBadge' ),
		overlayManager = M.require( 'skins.minerva.scripts/overlayManager' ),
		initialized = false;

	// Once the DOM is loaded hijack the notifications button to display an overlay rather
	// than linking to Special:Notifications.
	$( function () {
		// eslint-disable-next-line no-new
		new NotificationBadge( {
			overlayManager: overlayManager,
			router: router,
			mainMenu: mainMenu,
			el: $( '#secondary-button.user-button' ).parent()
		} );

		/**
		 * Adds a filter button to the UI inside notificationsInboxWidget
		 * @method
		 * @ignore
		 */
		function addFilterButton() {
			// Create filter button once the notifications overlay has been loaded
			var filterStatusButton = new OO.ui.ButtonWidget(
				{
					href: '#/notifications-filter',
					classes: [ 'mw-echo-ui-notificationsInboxWidget-main-toolbar-nav-filter-placeholder' ],
					icon: 'funnel',
					label: mw.msg( 'mobile-frontend-notifications-filter' )
				} );

			$( '.mw-echo-ui-notificationsInboxWidget-cell-placeholder' ).append(
				$( '<div>' )
					.addClass( 'mw-echo-ui-notificationsInboxWidget-main-toolbar-nav-filter' )
					.addClass( 'mw-echo-ui-notificationsInboxWidget-cell' )
					.append( filterStatusButton.$element )
			);
		}

		// This code will currently only be invoked on Special:Notifications
		// The code is bundled here since it makes use of loadModuleScript. This also allows
		// the possibility of invoking the filter from outside the Special page in future.
		// Once the 'ext.echo.special.onInitialize' hook has fired, load notification filter.
		mw.hook( 'ext.echo.special.onInitialize' ).add( function () {
			// The 'ext.echo.special.onInitialize' hook is fired whenever special page notification
			// changes display on click of a filter.
			// Hence the hook is restricted from firing more than once.
			if ( initialized ) {
				return;
			}

			// Load the notification filter overlay
			mw.loader.using( 'mobile.notifications.filter.overlay' ).then( function () {
				var $crossWikiUnreadFilter = $( '.mw-echo-ui-crossWikiUnreadFilterWidget' ),
					$notifReadState = $( '.mw-echo-ui-notificationsInboxWidget-main-toolbar-readState' ),
					NotificationsFilterOverlay = M.require( 'mobile.notifications.filter.overlay/NotificationsFilterOverlay' );

				// setup the filter button (now we have OOjs UI)
				addFilterButton();

				// setup route
				overlayManager.add( /^\/notifications-filter$/, function () {
					mainMenu.openNavigationDrawer( 'secondary' );
					return new NotificationsFilterOverlay( {
						$notifReadState: $notifReadState,
						mainMenu: mainMenu,
						$crossWikiUnreadFilter: $crossWikiUnreadFilter
					} );
				} );
			} );
			initialized = true;
		} );
	} );

}( mw.mobileFrontend ) );