( function ( M, $ ) {

	( function () {
		var overlayManager = M.require( 'skins.minerva.scripts/overlayManager' ),
			CleanupOverlay = M.require( 'mobile.issues/CleanupOverlay' );

		/**
		 * Extract a summary message from a cleanup template generated element that is
		 * friendly for mobile display.
		 * @param {Object} $box element to extract the message from
		 * @ignore
		 * @return {string} html of message.
		 */
		function extractMessage( $box ) {
			var selector = '.mbox-text, .ambox-text',
				$container = $( '<div>' );

			$box.find( selector ).each( function () {
				var contents,
					$this = $( this );
				// Clean up talk page boxes
				$this.find( 'table, .noprint' ).remove();
				contents = $this.html();

				if ( contents ) {
					$( '<p>' ).html( contents ).appendTo( $container );
				}
			} );
			return $container.html();
		}

		/**
		 * Create a link element that opens the issues overlay.
		 *
		 * @ignore
		 *
		 * @param {string} labelText The text value of the element
		 * @return {jQuery}
		 */
		function createLinkElement( labelText ) {
			return $( '<a class="cleanup mw-mf-cleanup"></a>' )
				.text( labelText );
		}

		/**
		 * Render a banner in a containing element.
		 * @param {jQuery.Object} $container to render the page issues banner inside.
		 * @param {string} labelText what the label of the page issues banner should say
		 * @param {string} headingText the heading of the overlay that is created when the page issues banner is clicked
		 * @ignore
		 */
		function createBanner( $container, labelText, headingText ) {
			var selector = 'table.ambox, table.tmbox, table.cmbox',
				$metadata = $container.find( selector ),
				issues = [],
				$link;

			// clean it up a little
			$metadata.find( '.NavFrame' ).remove();

			$metadata.each( function () {
				var content,
					$this = $( this );

				if ( $this.find( selector ).length === 0 ) {
					content = extractMessage( $this );
					if ( content ) {
						issues.push( {
							text: content
						} );
					}
				}
			} );

			$link = createLinkElement( labelText );
			$link.attr( 'href', '#/issues' );

			overlayManager.add( /^\/issues$/, function () {
				return new CleanupOverlay( {
					issues: issues,
					headingText: headingText
				} );
			} );

			if ( $metadata.length ) {
				$link.insertAfter( $( 'h1#section_0' ) );

				$metadata.remove();
			}
		}

		/**
		 * Scan an element for any known cleanup templates and replace them with a button
		 * that opens them in a mobile friendly overlay.
		 * @ignore
		 */
		function initPageIssues() {
			var ns = mw.config.get( 'wgNamespaceNumber' ),
				// Categories have no lead section
				$container = ns === 14 ? $( '#bodyContent' ) :
					M.getCurrentPage().getLeadSectionElement();

			if ( $container === null ) {
				return;
			}

			if ( ns === 0 ) {
				createBanner( $container, mw.msg( 'mobile-frontend-meta-data-issues' ),
					mw.msg( 'mobile-frontend-meta-data-issues-header' ) );
			// Create a banner for talk pages (namespace 1) in beta mode to make them more readable.
			} else if ( ns === 1 ) {
				createBanner( $container, mw.msg( 'mobile-frontend-meta-data-issues-talk' ),
					mw.msg( 'mobile-frontend-meta-data-issues-header-talk' ) );
			} else if ( ns === 14 ) {
				createBanner( $container, mw.msg( 'mobile-frontend-meta-data-issues-categories' ),
					mw.msg( 'mobile-frontend-meta-data-issues-header-talk' ) );
			}
		}

		// Setup the issues banner on the page
		initPageIssues();
	}() );

}( mw.mobileFrontend, jQuery ) );