( function () {
	var settings = new mw.libs.revisionSlider.Settings(),
		autoExpand = settings.shouldAutoExpand(),
		expanded = autoExpand,
		autoExpandButton,
		toggleButton = OO.ui.ButtonWidget.static.infuse( $( '.mw-revslider-toggle-button' ) ),
		initialize = function () {
			var startTime = mw.now(),
				api = new mw.libs.revisionSlider.Api( mw.util.wikiScript( 'api' ) ),
				changeTags = [];

			toggleButton.$element.children().attr( {
				'aria-expanded': autoExpand,
				'aria-controls': 'mw-revslider-slider-wrapper'
			} );

			mw.track( 'counter.MediaWiki.RevisionSlider.event.init' );
			mw.libs.revisionSlider.userOffset = mw.user.options.get( 'timecorrection' ) ? mw.user.options.get( 'timecorrection' ).split( '|' )[ 1 ] : mw.config.get( 'extRevisionSliderTimeOffset' );

			mw.libs.revisionSlider.HelpDialog.init();

			api.fetchAvailableChangeTags().then( function ( data ) {
				if ( typeof data === 'object' &&
					data.query &&
					data.query.tags &&
					data.query.tags.length > 0
				) {
					changeTags = data.query.tags;
				}
				api.fetchRevisionData( mw.config.get( 'wgPageName' ), {
					startId: mw.config.get( 'wgDiffNewId' ),
					limit: mw.libs.revisionSlider.calculateRevisionsPerWindow( 160, 16 ),
					changeTags: changeTags
				} ).then( function ( data ) {
					var revs,
						revisionList,
						$container,
						slider;

					mw.track( 'timing.MediaWiki.RevisionSlider.timing.initFetchRevisionData', mw.now() - startTime );

					try {
						revs = data.revisions;
						revs.reverse();

						$container = $( '.mw-revslider-slider-wrapper' );
						$container.attr( 'id', 'mw-revslider-slider-wrapper' );

						revisionList = new mw.libs.revisionSlider.RevisionList( mw.libs.revisionSlider.makeRevisions( revs ) );
						revisionList.getView().setDir( $container.css( 'direction' ) || 'ltr' );

						slider = new mw.libs.revisionSlider.Slider( revisionList );
						slider.getView().render( $container );

						$( window ).on( 'resize', OO.ui.throttle( function () {
							slider.getView().render( $container );
						}, 250 ) );

						if ( !settings.shouldHideHelpDialogue() ) {
							mw.libs.revisionSlider.HelpDialog.show();
							settings.setHideHelpDialogue( true );
						}

						$( '.mw-revslider-placeholder' ).remove();
						mw.track( 'timing.MediaWiki.RevisionSlider.timing.init', mw.now() - startTime );
					} catch ( err ) {
						$( '.mw-revslider-placeholder' )
							.text( mw.message( 'revisionslider-loading-failed' ).text() );
						mw.log.error( err );
						mw.track( 'counter.MediaWiki.RevisionSlider.error.init' );
					}
				}, function ( err ) {
					$( '.mw-revslider-placeholder' )
						.text( mw.message( 'revisionslider-loading-failed' ).text() );
					mw.log.error( err );
					mw.track( 'counter.MediaWiki.RevisionSlider.error.init' );
				} );
			} );
		},

		expand = function () {
			toggleButton.setTitle( mw.message( 'revisionslider-toggle-title-collapse' ).text() );
			$( '.mw-revslider-container' ).removeClass( 'mw-revslider-container-collapsed' )
				.addClass( 'mw-revslider-container-expanded' );
			$( '.mw-revslider-slider-wrapper' ).show();
			$( '.mw-revslider-auto-expand-button' ).show();
			toggleButton.$element.children().attr( 'aria-expanded', 'true' );
			expanded = true;
		},

		collapse = function () {
			toggleButton.setTitle( mw.message( 'revisionslider-toggle-title-expand' ).text() );
			$( '.mw-revslider-container' ).removeClass( 'mw-revslider-container-expanded' )
				.addClass( 'mw-revslider-container-collapsed' );
			$( '.mw-revslider-slider-wrapper' ).hide();
			$( '.mw-revslider-auto-expand-button' ).hide();
			toggleButton.$element.children().attr( 'aria-expanded', 'false' );
		};

	autoExpandButton = new OO.ui.ToggleButtonWidget( {
		icon: 'pushPin',
		classes: [ 'mw-revslider-auto-expand-button' ],
		title: mw.msg( autoExpand ?
			'revisionslider-turn-off-auto-expand-title' :
			'revisionslider-turn-on-auto-expand-title'
		),
		value: autoExpand
	} );

	autoExpandButton.$element.children().attr(
		'aria-label',
		mw.msg( autoExpand ?
			'revisionslider-turn-off-auto-expand-title' :
			'revisionslider-turn-on-auto-expand-title'
		)
	);

	autoExpandButton.connect( this, {
		click: function () {
			autoExpand = !autoExpand;
			settings.setAutoExpand( autoExpand );
			if ( autoExpand ) {
				autoExpandButton.setTitle( mw.msg( 'revisionslider-turn-off-auto-expand-title' ) );
				autoExpandButton.$element.children().attr(
					'aria-label', mw.msg( 'revisionslider-turn-off-auto-expand-title' )
				);
				expand();
				mw.track( 'counter.MediaWiki.RevisionSlider.event.autoexpand_on' );
			} else {
				autoExpandButton.setTitle( mw.msg( 'revisionslider-turn-on-auto-expand-title' ) );
				autoExpandButton.$element.children().attr(
					'aria-label', mw.msg( 'revisionslider-turn-on-auto-expand-title' )
				);
				mw.track( 'counter.MediaWiki.RevisionSlider.event.autoexpand_off' );
			}
		}
	} );

	$( '.mw-revslider-container' ).append( autoExpandButton.$element );

	toggleButton.connect( this, {
		click: function () {
			expanded = !expanded;
			if ( expanded ) {
				expand();
				mw.track( 'counter.MediaWiki.RevisionSlider.event.expand' );
				mw.hook( 'revslider.expand' ).fire();
			} else {
				collapse();
				mw.track( 'counter.MediaWiki.RevisionSlider.event.collapse' );
				mw.hook( 'revslider.collapse' ).fire();
			}
		}
	} );

	expand();
	initialize();

}() );