mediawiki-extensions-VisualEditor/modules/ve/init/mw/targets/ve.init.mw.ViewPageTarget.js

/*!
 * VisualEditor MediaWiki Initialization ViewPageTarget class.
 *
 * @copyright 2011-2013 VisualEditor Team and others; see AUTHORS.txt
 * @license The MIT License (MIT); see LICENSE.txt
 */

/*global mw, confirm, alert */

/**
 * Initialization MediaWiki view page target.
 *
 * @class
 * @extends ve.init.mw.Target
 *
 * @constructor
 */
ve.init.mw.ViewPageTarget = function VeInitMwViewPageTarget() {
	var browserWhitelisted,
		browserBlacklisted,
		currentUri = new mw.Uri(),
		supportsES5subset = (
			// It would be much easier to do a quick inline function that asserts "use strict"
			// works, but since IE9 doesn't support strict mode (and we don't use strict mode) we
			// have to instead list all the ES5 features we use.
			Array.isArray &&
			Array.prototype.filter &&
			Array.prototype.indexOf &&
			Array.prototype.map &&
			Date.prototype.toJSON &&
			Function.prototype.bind &&
			Object.create &&
			Object.keys &&
			String.prototype.trim &&
			window.JSON &&
			JSON.parse &&
			JSON.stringify
		),
		supportsContentEditable = 'contentEditable' in document.createElement( 'div' );

	// Parent constructor
	ve.init.mw.Target.call(
		this, $( '#content' ),
		mw.config.get( 'wgRelevantPageName' ),
		currentUri.query.oldid
	);

	// Properties
	this.$document = null;
	this.$spinner = $( '<div class="ve-init-mw-viewPageTarget-loading"></div>' );
	this.$toolbarTracker = $( '<div class="ve-init-mw-viewPageTarget-toolbarTracker"></div>' );
	this.toolbarCancelButton = null;
	this.toolbarSaveButton = null;
	this.saveDialogSlideHistory = [];
	this.saveDialogSaveButton = null;
	this.saveDialogReviewGoodButton = null;

	this.$toolbarEditNotices = $( '<div>' )
		.addClass( 've-init-mw-viewPageTarget-toolbar-editNotices' );
	this.$toolbarEditNoticesTool = $( '<div>' )
		.addClass( 've-init-mw-viewPageTarget-tool' );

	this.$toolbarFeedbackTool = $( '<div>' )
		.addClass( 've-init-mw-viewPageTarget-tool' );

	this.$toolbarBetaNotice = $( '<div>' )
		.addClass( 've-init-mw-viewPageTarget-toolbar-betaNotice' );
	this.$toolbarBetaNoticeTool = $( '<div>' )
		.addClass( 've-init-mw-viewPageTarget-tool' );

	this.$toolbarMwMetaButton = $( '<div>' )
		.addClass( 've-init-mw-viewPageTarget-tool' );
	this.$saveDialog = $( '<div>' )
		.addClass( 've-init-mw-viewPageTarget-saveDialog' );

	this.onBeforeUnloadFallback = null;
	this.onBeforeUnloadHandler = null;
	this.active = false;
	this.edited = false;
	this.activating = false;
	this.deactivating = false;
	// If this is true then #transformPage / #restorePage will not call pushState
	// This is to avoid adding a new history entry for the url we just got from onpopstate
	// (which would mess up with the expected order of Back/Forwards browsing)
	this.actFromPopState = false;
	this.scrollTop = null;
	this.currentUri = currentUri;
	this.warnings = {};
	this.restoring = this.oldid !== mw.config.get( 'wgCurRevisionId' );
	this.section = currentUri.query.vesection || null;
	this.namespaceName = mw.config.get( 'wgCanonicalNamespace' );
	this.viewUri = new mw.Uri( mw.util.wikiGetlink( this.pageName ) );
	this.veEditUri = this.viewUri.clone().extend( { 'veaction': 'edit' } );
	this.isViewPage = (
		mw.config.get( 'wgAction' ) === 'view' &&
		currentUri.query.diff === undefined
	);
	this.originalDocumentTitle = document.title;
	this.editSummaryByteLimit = 255;
	this.tabLayout = mw.config.get( 'wgVisualEditorConfig' ).tabLayout;

	browserWhitelisted = (
		'vewhitelist' in currentUri.query ||
		$.client.test( ve.init.mw.ViewPageTarget.compatibility.whitelist, null, true )
	);
	browserBlacklisted = (
		!( 'vewhitelist' in currentUri.query ) &&
		$.client.test( ve.init.mw.ViewPageTarget.compatibility.blacklist, null, true )
	);

	if ( mw.config.get( 'wgVisualEditorConfig' ).enableEventLogging ) {
		this.setUpEventLogging();
	} else {
		this.logEvent = $.noop;
	}

	// Events
	this.connect( this, {
		'load': 'onLoad',
		'save': 'onSave',
		'loadError': 'onLoadError',
		'tokenError': 'onTokenError',
		'saveError': 'onSaveError',
		'editConflict': 'onEditConflict',
		'showChanges': 'onShowChanges',
		'showChangesError': 'onShowChangesError',
		'noChanges': 'onNoChanges',
		'serializeError': 'onSerializeError'
	} );

	if ( !supportsES5subset || !supportsContentEditable || browserBlacklisted ) {
		// Don't initialise in browsers that are broken
		return;
	}

	if ( !browserWhitelisted ) {
		// Show warning in unknown browsers that pass the support test
		// Continue at own risk.
		this.localNoticeMessages.push( 'visualeditor-browserwarning' );
	}

	if ( currentUri.query.venotify ) {
		// The following messages can be used here:
		// visualeditor-notification-saved
		// visualeditor-notification-created
		// visualeditor-notification-restored
		mw.notify(
			ve.msg( 'visualeditor-notification-' + currentUri.query.venotify,
				new mw.Title( this.pageName ).toText()
			)
		);
		if ( window.history.replaceState ) {
			delete currentUri.query.venotify;
			window.history.replaceState( null, document.title, currentUri );
		}
	}

	this.setupSkinTabs();
	this.setupSectionEditLinks();
	if ( this.isViewPage ) {
		if ( currentUri.query.veaction === 'edit' ) {
			this.activate();
		}
	}

	window.addEventListener( 'popstate', ve.bind( this.onWindowPopState, this ) ) ;
};

/* Inheritance */

ve.inheritClass( ve.init.mw.ViewPageTarget, ve.init.mw.Target );

/* Static Properties */

/**
 * Compatibility map used with jQuery.client to black-list incompatible browsers.
 *
 * @static
 * @property
 */
ve.init.mw.ViewPageTarget.compatibility = {
	// The key is the browser name returned by jQuery.client
	// The value is either null (match all versions) or a list of tuples
	// containing an inequality (<,>,<=,>=) and a version number
	'whitelist': {
		'firefox': [['>=', 11]],
		'iceweasel': [['>=', 10]],
		'safari': [['>=', 5]],
		'chrome': [['>=', 19]]
	},
	'blacklist': {
		// IE <= 8 has various incompatibilities in layout and feature support
		// IE9 and IE10 generally work but fail in ajax handling when making POST
		// requests to the VisualEditor/Parsoid API which is causing silent failures
		// when trying to save a page (bug 49187)
		'msie': [['<=', 10]],
		'android': [['<', 3]],
		// Blacklist all versions:
		'opera': null,
		'blackberry': null
	}
};

ve.init.mw.ViewPageTarget.static.toolbarTools = [
	{ 'items': [ 'undo', 'redo' ] },
	{ 'items': [ 'mwFormat' ] },
	{ 'items': [ 'bold', 'italic', 'mwLink', 'clear' ] },
	{ 'items': [ 'number', 'bullet', 'outdent', 'indent' ] },
	{ 'items': [ 'mwMediaInsert', 'mwReference', 'mwReferenceList', 'mwTransclusion' ] }
];

ve.init.mw.ViewPageTarget.static.surfaceCommands = [
	'bold', 'italic', 'mwLink', 'undo', 'redo', 'indent', 'outdent'
];

// TODO: Accessibility tooltips and logical tab order for prevButton and closeButton.
ve.init.mw.ViewPageTarget.saveDialogTemplate = '\
	<div class="ve-init-mw-viewPageTarget-saveDialog-head">\
		<div class="ve-init-mw-viewPageTarget-saveDialog-prevButton"></div>\
		<div class="ve-init-mw-viewPageTarget-saveDialog-closeButton"></div>\
		<div class="ve-init-mw-viewPageTarget-saveDialog-title"></div>\
	</div>\
	<div class="ve-init-mw-viewPageTarget-saveDialog-body">\
		<div class="ve-init-mw-viewPageTarget-saveDialog-slide ve-init-mw-viewPageTarget-saveDialog-slide-save">\
			<div class="ve-init-mw-viewPageTarget-saveDialog-summary">\
				<textarea name="editSummary" class="ve-init-mw-viewPageTarget-saveDialog-editSummary"\
					id="ve-init-mw-viewPageTarget-saveDialog-editSummary" type="text"\
					rows="4"></textarea>\
			</div>\
			<div class="ve-init-mw-viewPageTarget-saveDialog-options">\
				<input type="checkbox" name="minorEdit" \
					id="ve-init-mw-viewPageTarget-saveDialog-minorEdit">\
				<label class="ve-init-mw-viewPageTarget-saveDialog-minorEdit-label"\
					for="ve-init-mw-viewPageTarget-saveDialog-minorEdit"></label>\
				<input type="checkbox" name="watchList"\
					id="ve-init-mw-viewPageTarget-saveDialog-watchList">\
				<label class="ve-init-mw-viewPageTarget-saveDialog-watchList-label"\
					for="ve-init-mw-viewPageTarget-saveDialog-watchList"></label>\
				<label class="ve-init-mw-viewPageTarget-saveDialog-editSummaryCount"></label>\
			</div>\
			<div class="ve-init-mw-viewPageTarget-saveDialog-warnings"></div>\
			<div class="ve-init-mw-viewPageTarget-saveDialog-actions">\
				<div class="ve-init-mw-viewPageTarget-saveDialog-working"></div>\
			</div>\
			<div style="clear: both;"></div>\
			<div class="ve-init-mw-viewPageTarget-saveDialog-foot">\
				<p class="ve-init-mw-viewPageTarget-saveDialog-license"></p>\
			</div>\
		</div>\
		<div class="ve-init-mw-viewPageTarget-saveDialog-slide ve-init-mw-viewPageTarget-saveDialog-slide-review">\
			<div class="ve-init-mw-viewPageTarget-saveDialog-viewer"></div>\
			<div class="ve-init-mw-viewPageTarget-saveDialog-actions">\
				<div class="ve-init-mw-viewPageTarget-saveDialog-working"></div>\
			</div>\
			<div style="clear: both;"></div>\
		</div>\
		<div class="ve-init-mw-viewPageTarget-saveDialog-slide ve-init-mw-viewPageTarget-saveDialog-slide-conflict">\
			<div class="ve-init-mw-viewPageTarget-saveDialog-conflict">\
			</div>\
			<div class="ve-init-mw-viewPageTarget-saveDialog-actions">\
				<div class="ve-init-mw-viewPageTarget-saveDialog-working"></div>\
			</div>\
			<div style="clear: both;"></div>\
		</div>\
		<div class="ve-init-mw-viewPageTarget-saveDialog-slide ve-init-mw-viewPageTarget-saveDialog-slide-nochanges">\
			<div class="ve-init-mw-viewPageTarget-saveDialog-nochanges">\
			</div>\
		</div>\
	</div>';

/* Methods */

/**
 * Switch to edit mode.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.activate = function () {
	if ( !this.active && !this.activating ) {
		this.activating = true;

		// User interface changes
		this.transformPage();
		this.showSpinner();
		this.hideTableOfContents();
		this.mutePageContent();
		this.mutePageTitle();
		this.saveScrollPosition();
		this.load();
	}
};

/**
 * Switch to view mode.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.deactivate = function ( override ) {
	if ( override || ( this.active && !this.deactivating ) ) {
		if (
			override ||
			!this.edited ||
			confirm( ve.msg( 'visualeditor-viewpage-savewarning' ) )
		) {
			this.deactivating = true;
			// User interface changes
			this.restorePage();
			this.hideSpinner();

			if ( this.toolbarCancelButton ) {
				// If deactivate is called before a successful load, then
				// setupToolbarButtons has not been called yet and as such tearDownToolbarButtons
				// would throw an error when trying call methods on the button property (bug 46456)
				this.tearDownToolbarButtons();
				this.detachToolbarButtons();
			}

			this.resetSaveDialog();
			this.hideSaveDialog();
			this.detachSaveDialog();
			// Check we got as far as setting up the surface
			if ( this.active ) {
				this.tearDownSurface();
			} else {
				this.showPageContent();
			}
			// If there is a load in progress, abort it
			if ( this.loading ) {
				this.loading.abort();
			}
			this.showTableOfContents();
			this.deactivating = false;
		}
	}
};

/**
 * Handle successful DOM load event.
 *
 * @method
 * @param {HTMLDocument} doc Parsed DOM from server
 */
ve.init.mw.ViewPageTarget.prototype.onLoad = function ( doc ) {
	if ( this.activating ) {
		this.logEvent( 'Edit', { action: 'page-edit-impression' } );
		this.edited = false;
		this.doc = doc;
		this.setUpSurface( doc );
		this.setupToolbarEditNotices();
		this.setupToolbarBetaNotice();
		this.setupToolbarButtons();
		this.setupSaveDialog();
		this.attachToolbarButtons();
		this.attachSaveDialog();
		this.restoreScrollPosition();
		this.restoreEditSection();
		this.setupBeforeUnloadHandler();
		this.$document[0].focus();
		this.activating = false;
	}
};

/**
 * Handle failed DOM load event.
 *
 * @method
 * @param {Object} response HTTP Response object
 * @param {string} status Text status message
 * @param {Mixed} error Thrown exception or HTTP error string
 */
ve.init.mw.ViewPageTarget.prototype.onLoadError = function ( response, status ) {
	// Don't show an error if the load was manually aborted
	if ( status !== 'abort' && confirm( ve.msg( 'visualeditor-loadwarning', status ) ) ) {
		this.load();
	} else {
		this.activating = false;
		// User interface changes
		this.deactivate( true );
	}
};

/**
 * Handle failed token refresh event.
 *
 * @method
 * @param {Object} response Response object
 * @param {string} status Text status message
 * @param {Mixed} error Thrown exception or HTTP error string
 */
ve.init.mw.ViewPageTarget.prototype.onTokenError = function ( response, status ) {
	if ( confirm( ve.msg( 'visualeditor-loadwarning-token', status ) ) ) {
		this.load();
	} else {
		this.activating = false;
		// User interface changes
		this.deactivate( true );
	}
};

/**
 * Handle successful DOM save event.
 *
 * @method
 * @param {HTMLElement} html Rendered HTML from server
 * @param {number} [newid] New revision id, undefined if unchanged
 */
ve.init.mw.ViewPageTarget.prototype.onSave = function ( html, newid ) {
	this.logEvent( 'Edit', {
		action: 'page-save-success',
		latency: this.saveStart ? new Date() - this.saveStart : 0
	} );
	delete this.saveStart;

	if ( !this.pageExists || this.restoring ) {
		// This is a page creation or restoration, refresh the page
		this.tearDownBeforeUnloadHandler();
		window.location.href = this.viewUri.extend( {
			'venotify': this.restoring ? 'restored' : 'created'
		} );
	} else {
		// Update watch link to match 'watch checkbox' in save dialog.
		// User logged in if module loaded.
		// Just checking for mw.page.watch is not enough because in Firefox
		// there is Object.prototype.watch...
		if ( mw.page.watch && mw.page.watch.updateWatchLink ) {
			var watchChecked = this.$saveDialog
				.find( '#ve-init-mw-viewPageTarget-saveDialog-watchList')
				.prop( 'checked' );
			mw.page.watch.updateWatchLink(
				$( '#ca-watch a, #ca-unwatch a' ),
				watchChecked ? 'unwatch': 'watch'
			);
		}
		if ( newid !== undefined ) {
			this.oldid = newid;
		}
		this.hideSaveDialog();
		this.resetSaveDialog();
		this.replacePageContent( html );
		this.setupSectionEditLinks();
		this.tearDownBeforeUnloadHandler();
		this.deactivate( true );
		mw.util.jsMessage(
			ve.msg( 'visualeditor-notification-saved',
				new mw.Title( this.pageName ).toText()
			)
		);
	}
};

/**
 * Handle failed DOM save event.
 *
 * @method
 * @param {Object} jqXHR
 * @param {string} status Text status message
 * @param {Mixed} error Thrown exception or HTTP error string
 */
ve.init.mw.ViewPageTarget.prototype.onSaveError = function ( jqXHR, status ) {
	// TODO: Don't use alert.
	alert( ve.msg( 'visualeditor-saveerror', status ) );
	this.saveDialogSaveButton.setDisabled( false );
	this.$saveDialogLoadingIcon.hide();
};

/**
 * Handle Show changes event.
 *
 * @method
 * @param {string} diffHtml
 */
ve.init.mw.ViewPageTarget.prototype.onShowChanges = function ( diffHtml ) {
	// Invalidate the viewer diff on next change
	this.surface.getModel().connect( this, { 'transact': 'onSurfaceModelTransact' } );

	mw.loader.using( 'mediawiki.action.history.diff', ve.bind( function () {
		this.$saveDialog
			.find( '.ve-init-mw-viewPageTarget-saveDialog-viewer' )
				.empty().append( diffHtml );

		this.$saveDialogLoadingIcon.hide();
		this.saveDialogReviewGoodButton.setDisabled( false );

	}, this ), ve.bind( function () {
		this.onSaveError( null, 'Module load failed' );
	}, this ) );
};

/**
 * Handle Serialize event.
 *
 * @method
 * @param {string} wikitext
 */
ve.init.mw.ViewPageTarget.prototype.onSerialize = function ( wikitext ) {
	// Invalidate the viewer wikitext on next change
	this.surface.getModel().connect( this, { 'transact': 'onSurfaceModelTransact' } );

	this.$saveDialog
		.find( '.ve-init-mw-viewPageTarget-saveDialog-viewer' )
			.empty().append( $( '<pre>' ).text( wikitext ) );

		this.$saveDialogLoadingIcon.hide();
		this.saveDialogReviewGoodButton.setDisabled( false );
};

/**
 * Handle failed show changes event.
 *
 * @method
 * @param {Object} jqXHR
 * @param {string} status Text status message
 */
ve.init.mw.ViewPageTarget.prototype.onShowChangesError = function ( jqXHR, status ) {
	alert( ve.msg( 'visualeditor-differror', status ) );
	this.$saveDialogLoadingIcon.hide();
};

/**
 * Called if a call to target.serialize() failed.
 *
 * @method
 * @param {jqXHR|null} jqXHR
 * @param {string} status Text status message
 */
ve.init.mw.ViewPageTarget.prototype.onSerializeError = function ( jqXHR, status ) {
	alert( ve.msg( 'visualeditor-serializeerror', status ) );
	this.$saveDialogLoadingIcon.hide();
};

/**
 * Handle edit conflict event.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.onEditConflict = function () {
	this.$saveDialogLoadingIcon.hide();
	this.swapSaveDialog( 'conflict' );
};

/**
 * Handle failed show changes event.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.onNoChanges = function () {
	this.$saveDialogLoadingIcon.hide();
	this.swapSaveDialog( 'nochanges' );
};

/**
 * Handle clicks on the edit tab.
 *
 * @method
 * @param {jQuery.Event} e Mouse click event
 */
ve.init.mw.ViewPageTarget.prototype.onEditTabClick = function ( e ) {
	this.logEvent( 'Edit', { action: 'edit-link-click' } );
	this.activate();
	// Prevent the edit tab's normal behavior
	e.preventDefault();
};

/**
 * Handle clicks on a section edit link.
 *
 * @method
 * @param {jQuery.Event} e Mouse click event
 */
ve.init.mw.ViewPageTarget.prototype.onEditSectionLinkClick = function ( e ) {
	this.logEvent( 'Edit', { action: 'section-edit-link-click' } );
	this.saveEditSection( $( e.target ).closest( 'h1, h2, h3, h4, h5, h6' ).get( 0 ) );
	this.activate();
	// Prevent the edit tab's normal behavior
	e.preventDefault();
};

/**
 * Handle clicks on the view tab.
 *
 * @method
 * @param {jQuery.Event} e Mouse click event
 */
ve.init.mw.ViewPageTarget.prototype.onViewTabClick = function ( e ) {
	if ( this.active ) {
		this.deactivate();
		// Prevent the edit tab's normal behavior
		e.preventDefault();
	} else if ( this.activating ) {
		this.deactivate( true );
		this.activating = false;
		e.preventDefault();
	}
};

/**
 * Handle clicks on the save button in the toolbar.
 *
 * @method
 * @param {jQuery.Event} e Mouse click event
 */
ve.init.mw.ViewPageTarget.prototype.onToolbarSaveButtonClick = function () {
	this.logEvent( 'Edit', { action: 'page-save-attempt' } );
	if ( this.edited || this.restoring ) {
		this.showSaveDialog();
	}
};

/**
 * Handle clicks on the save button in the toolbar.
 *
 * @method
 * @param {jQuery.Event} e Mouse click event
 */
ve.init.mw.ViewPageTarget.prototype.onToolbarCancelButtonClick = function () {
	this.deactivate();
};

/**
 * Handle clicks on the MwMeta button in the toolbar.
 *
 * @method
 * @param {jQuery.Event} e Mouse click event
 */
ve.init.mw.ViewPageTarget.prototype.onToolbarMwMetaButtonClick = function () {
	this.surface.getDialogs().open( 'mwMeta' );
};


/**
 * Handle clicks on the edit notices tool in the toolbar.
 *
 * @method
 * @param {jQuery.Event} e Mouse click event
 */
ve.init.mw.ViewPageTarget.prototype.onToolbarEditNoticesToolClick = function () {
	this.$toolbarEditNotices.fadeToggle( 'fast' );
	this.$toolbarBetaNotice.fadeOut( 'fast' );
	this.$document[0].focus();
};

/**
 * Handle clicks on the beta notices tool in the toolbar.
 *
 * @method
 * @param {jQuery.Event} e Mouse click event
 */
ve.init.mw.ViewPageTarget.prototype.onToolbarBetaNoticeToolClick = function () {
	this.$toolbarBetaNotice.fadeToggle( 'fast' );
	this.$toolbarEditNotices.fadeOut( 'fast' );
	this.$document[0].focus();
};

/**
 * Handle clicks on the feedback tool in the toolbar.
 *
 * @method
 * @param {jQuery.Event} e Mouse click event
 */
ve.init.mw.ViewPageTarget.prototype.onToolbarFeedbackToolClick = function () {
	this.$toolbarEditNotices.fadeOut( 'fast' );
	if ( !this.feedback ) {
		// This can't be constructed until the editor has loaded as it uses special messages
		this.feedback = new mw.Feedback( {
			'title': new mw.Title( ve.msg( 'visualeditor-feedback-link' ) ),
			'bugsLink': new mw.Uri( 'https://bugzilla.wikimedia.org/enter_bug.cgi?product=VisualEditor&component=General' ),
			'bugsListLink': new mw.Uri( 'https://bugzilla.wikimedia.org/buglist.cgi?query_format=advanced&resolution=---&resolution=LATER&resolution=DUPLICATE&product=VisualEditor&list_id=166234' )
		} );
	}
	this.feedback.launch();
};

/**
 * Handle the first transaction in the surface model.
 *
 * This handler is removed the first time it's used, but added each time the surface is set up.
 *
 * @method
 * @param {ve.dm.Transaction} tx Processed transaction
 */
ve.init.mw.ViewPageTarget.prototype.onSurfaceModelTransact = function () {
	// Clear the diff
	this.$saveDialog
		.find( '.ve-init-mw-viewPageTarget-saveDialog-slide-review .ve-init-mw-viewPageTarget-saveDialog-viewer' )
			.empty();

	this.surface.getModel().disconnect( this, { 'transact': 'onSurfaceModelTransact' } );
};

/**
 * Handle history events in the surface model.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.onSurfaceModelHistory = function () {
	this.edited = this.surface.getModel().hasPastState();
	// Disable the save button if we have no history
	this.toolbarSaveButton.setDisabled( !this.edited && !this.restoring );
};

/**
 * Handle clicks on the review button in the save dialog.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.onSaveDialogReviewButtonClick = function () {
	this.swapSaveDialog( 'review' );
};

/**
 * Handle clicks on the save button in the save dialog.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.onSaveDialogSaveButtonClick = function () {
	var doc = this.surface.getModel().getDocument(),
		saveOptions = this.getSaveOptions();
	this.saveStart = +new Date();
	if (
		+mw.user.options.get( 'forceeditsummary' ) &&
		saveOptions.summary === '' &&
		!this.warnings.missingsummary
	) {
		this.showWarning( 'missingsummary', ve.init.platform.getParsedMessage( 'missingsummary' ) );
	} else {
		this.saveDialogSaveButton.setDisabled( true );
		this.$saveDialogLoadingIcon.show();
		this.save(
			ve.dm.converter.getDomFromData( doc.getFullData(), doc.getStore(), doc.getInternalList() ),
			saveOptions
		);
	}
};

/**
 * Handle clicks on the review "Good" button in the save dialog.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.onSaveDialogReviewGoodButtonClick = function () {
	this.swapSaveDialog( 'save' );
};

/**
 * Handle clicks on the resolve conflict button in the conflict dialog.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.onSaveDialogResolveConflictButtonClick = function () {
	var doc = this.surface.getModel().getDocument();
	// Get Wikitext from the DOM, and set up a submit call when it's done
	this.serialize(
		ve.dm.converter.getDomFromData( doc.getFullData(), doc.getStore(), doc.getInternalList() ),
		ve.bind( function ( wikitext ) {
			this.submit( wikitext, this.getSaveOptions() );
		}, this )
	);
};

/**
 * Get save options from the save dialog form.
 *
 * @method
 * @returns {Object} Save options, including summary, minor and watch properties
 */
ve.init.mw.ViewPageTarget.prototype.getSaveOptions = function () {
	return {
		'summary': $( '#ve-init-mw-viewPageTarget-saveDialog-editSummary' ).val(),
		'minor': $( '#ve-init-mw-viewPageTarget-saveDialog-minorEdit' ).prop( 'checked' ),
		'watch': $( '#ve-init-mw-viewPageTarget-saveDialog-watchList' ).prop( 'checked' )
	};
};

/**
 * Handle clicks on the close button in the save dialog.
 *
 * @method
 * @param {jQuery.Event} e Mouse click event
 */
ve.init.mw.ViewPageTarget.prototype.onSaveDialogCloseButtonClick = function () {
	this.hideSaveDialog();
};

/**
 * Handle clicks on the previous view button in the save dialog.
 *
 * @method
 * @param {jQuery.Event} e Mouse click event
 */
ve.init.mw.ViewPageTarget.prototype.onSaveDialogPrevButtonClick = function () {
	var history = this.saveDialogSlideHistory;
	if ( history.length < 2  ) {
		throw new Error( 'PrevButton was triggered without a history' );
	}
	// Pop off current slide
	history.pop();
	// Navigate to last slide
	this.swapSaveDialog( history[ history.length -1 ], { fromHistory: true } );
};

/**
 * Set up the list of edit notices.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.setupToolbarEditNotices = function () {
	var key;
	this.$toolbarEditNotices.empty();
	for ( key in this.editNotices ) {
		this.$toolbarEditNotices.append( this.editNotices[key] );
	}
};

/**
 * Set up the beta notices panel.
 *
 * @method
 * @returns {string[]} HTML strings for each edit notice
 */
ve.init.mw.ViewPageTarget.prototype.setupToolbarBetaNotice = function () {
	this.$toolbarBetaNotice.empty();
	this.$toolbarBetaNotice
		.append( $( '<span>' ).text( ve.msg( 'visualeditor-beta-warning' ) ) );
};

/**
 * Switch to editing mode.
 *
 * @method
 * @param {HTMLDocument} doc HTML DOM to edit
 */
ve.init.mw.ViewPageTarget.prototype.setUpSurface = function ( doc ) {
	// Initialize surface
	this.surface = new ve.ui.Surface( doc, this.surfaceOptions );
	this.surface.connect( this, { 'toolbarPosition': 'onSurfaceToolbarPosition' } );
	this.surface.getContext().hide();
	this.$document = this.surface.$.find( '.ve-ce-documentNode' );
	this.surface.getModel().connect( this, { 'transact': 'onSurfaceModelTransact' } );
	this.surface.getModel().connect( this, { 'history': 'onSurfaceModelHistory' } );
	this.$.append( this.surface.$ );
	this.surface.initialize();
	this.setUpToolbar();
	this.transformPageTitle();
	this.changeDocumentTitle();

	// Update UI
	this.hidePageContent();
	this.hideSpinner();
	this.active = true;
	this.$document.attr( {
		'lang': mw.config.get( 'wgVisualEditor' ).pageLanguageCode,
		'dir': mw.config.get( 'wgVisualEditor' ).pageLanguageDir
	} );

	// Add appropriately mw-content-ltr or mw-content-rtl class
	this.surface.$.addClass( 'mw-content-' + mw.config.get( 'wgVisualEditor' ).pageLanguageDir );
};

/**
 * The toolbar has updated its position.
 * @param {jQuery} $bar
 */
ve.init.mw.ViewPageTarget.prototype.onSurfaceToolbarPosition = function ( $bar ) {
	var css, offset, startProp, startOffset,
		dir = mw.config.get( 'wgVisualEditor' ).pageLanguageDir,
		type = $bar.css( 'position' );

	// It's important that the toolbar tracker has 0 height. Else it will block events on the
	// toolbar (e.g. clicking "Save page") as it would overlap that space. The save dialog
	// will remain visible for the same reason elsewhere: As long as we don't have overflow:hidden,
	// the save dialog will stick out of the tracker in the right place without the tracker itself
	// blocking the toolbar.

	if ( type === 'relative' ) {
		offset = $bar.offset();

		css = {
			'position': 'absolute',
			'top': offset.top
		};

		if ( dir === 'ltr' ) {
			startProp = 'left';
			startOffset = offset.left;
		} else {
			startProp = 'right';
			startOffset = $( window ).width() - ( offset.left + $bar.outerWidth() );

		}

		css[ startProp ] = startOffset;

	} else if ( type === 'absolute' || type === 'fixed' ) {
		css = {
			'position': type,
			'top': $bar.css( 'top' ),
			'left': $bar.css( 'left' )
		};
	} else {
		return;
	}
	this.$toolbarTracker.css( css );
};

/**
 * Set up the logging of analytic edit events using EventLogging.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.setUpEventLogging = function () {
	mw.loader.using( 'schema.Edit', function () {
		mw.eventLog.setDefaults( 'Edit', {
			version: 0,
			editor: 'visualeditor',
			pageId: mw.config.get( 'wgArticleId' ),
			pageNs: mw.config.get( 'wgNamespaceNumber' ),
			pageName: mw.config.get( 'wgPageName' ),
			pageViewSessionId: mw.user.generateRandomSessionId(),
			revId: function () {
				return mw.config.get( 'wgCurRevisionId' );
			},
			userId: +mw.config.get( 'wgUserId' )
		} );
	} );
};

/**
 * Thin wrapper around EventLogging's 'logEvent' method which ensures the
 * relevant schema module has been loaded.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.logEvent = function ( schemaName, event ) {
	mw.loader.using( 'schema.' + schemaName, function () {
		mw.eventLog.logEvent( schemaName, event );
	} );
};

/**
 * Switch to viewing mode.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.tearDownSurface = function () {
	// Update UI
	if ( this.$document ) {
		this.$document.blur();
		this.$document = null;
	}
	this.tearDownToolbar();
	this.hideSpinner();
	this.showPageContent();
	this.restorePageTitle();
	this.restoreDocumentTitle();
	this.showTableOfContents();
	// Destroy surface
	if ( this.surface ) {
		this.surface.destroy();
		this.surface = null;
	}
	this.active = false;
};

/**
 * Modify tabs in the skin to support in-place editing.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.setupSkinTabs = function () {
	var caVeEdit, caVeEditSource,
		action = this.pageExists ? 'edit' : 'create',
		pTabsId = $( '#p-views' ).length ? 'p-views' : 'p-cactions',
		$caSource = $( '#ca-viewsource' ),
		$caEdit = $( '#ca-edit' ),
		$caEditLink = $caEdit.find( 'a' ),
		reverseTabOrder = $( 'body' ).hasClass( 'rtl' ) && pTabsId === 'p-views',
		caVeEditNextnode = reverseTabOrder ? $caEdit.get( 0 ) : $caEdit.next().get( 0 );

	if ( !$caEdit.length || $caSource.length ) {
		// If there is no edit tab or a view-source tab,
		// the user doesn't have permission to edit.
		return;
	}

	// Add independent "VisualEditor" tab (#ca-ve-edit).
	if ( this.tabLayout === 'add' ) {

		caVeEdit = mw.util.addPortletLink(
			pTabsId,
			// Use url instead of '#'.
			// So that 1) one can always open it in a new tab, even when
			// onEditTabClick is bound.
			// 2) when onEditTabClick is not bound (!isViewPage) it will
			// just work.
			this.veEditUri,
			// Message: 'visualeditor-ca-ve-edit' or 'visualeditor-ca-ve-create'
			ve.msg( 'visualeditor-ca-ve-' + action ),
			'ca-ve-edit',
			ve.msg( 'tooltip-ca-ve-edit' ),
			ve.msg( 'accesskey-ca-ve-edit' ),
			caVeEditNextnode
		);

	// Replace "Edit" tab with a veEditUri version, add "Edit source" tab.
	} else {
		// Create "Edit source" link.
		// Re-create instead of convert ca-edit since we don't want to copy over accesskey etc.
		caVeEditSource = mw.util.addPortletLink(
			pTabsId,
			// Use original href to preserve oldid etc. (bug 38125)
			$caEditLink.attr( 'href' ),
			// Message: 'visualeditor-ca-editsource' or 'visualeditor-ca-createsource'
			ve.msg( 'visualeditor-ca-' + action + 'source' ),
			'ca-editsource',
			// Message: 'tooltip-ca-editsource' or 'tooltip-ca-createsource'
			ve.msg( 'tooltip-ca-' + action + 'source' ),
			ve.msg( 'accesskey-ca-editsource' ),
			caVeEditNextnode
		);
		// Copy over classes (e.g. 'selected')
		$( caVeEditSource ).addClass( $caEdit.attr( 'class' ) );

		// Create "Edit" tab.
		$caEdit.remove();
		caVeEdit = mw.util.addPortletLink(
			pTabsId,
			// Use url instead of '#'.
			// So that 1) one can always open it in a new tab, even when
			// onEditTabClick is bound.
			// 2) when onEditTabClick is not bound (!isViewPage) it will
			// just work.
			this.veEditUri,
			$caEditLink.text(),
			$caEdit.attr( 'id' ),
			$caEditLink.attr( 'title' ),
			ve.msg( 'accesskey-ca-ve-edit' ),
			reverseTabOrder ? caVeEditSource.nextSibling : caVeEditSource
		);
	}

	if ( this.isViewPage ) {
		// Allow instant switching to edit mode, without refresh
		$( caVeEdit ).click( ve.bind( this.onEditTabClick, this ) );
		// Allow instant switching back to view mode, without refresh
		$( '#ca-view a, #ca-nstab-visualeditor a' )
			.click( ve.bind( this.onViewTabClick, this ) );
	}
};

/**
 * Modify page content to make section edit links activate the editor.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.setupSectionEditLinks = function () {
	var veEditUri = this.veEditUri,
		$editsections = $( '#mw-content-text .mw-editsection' ),
		handler = ve.bind( this.onEditSectionLinkClick, this );

	$editsections.each( function () {
		var $brackets, $expandedOnly, $middleBracket, $hiddenBracket, closingBracketSymbol,
			expandTimeout, contractTimeout,
			$this = $( this ),
			$heading = $this.closest( 'h1,h2,h3,h4,h5,h6' ),
			$edit = $this.find( 'a' ).eq( 0 ),
			$editSource = $edit.clone(),
			$links = $edit.add( $editSource ),
			$divider = $( '<span>' ),
			dividerSymbol = $.trim( ve.msg( 'pipe-separator' ) ),
			veSectionEditUri = new mw.Uri( veEditUri.toString() ),
			sectionEditUri = new mw.Uri( $edit.attr( 'href' ) );

		function expandSoon() {
			clearTimeout( contractTimeout );
			expandTimeout = setTimeout( expand, 100 );
		}

		function contractSoon() {
			clearTimeout( expandTimeout );
			contractTimeout = setTimeout( contract, 100 );
		}

		function expand() {
			clearTimeout( contractTimeout );
			$middleBracket.css( 'visibility', 'hidden' );
			$expandedOnly.css( 'visibility', 'visible' );
			$heading.addClass( 'mw-editsection-expanded' );
		}

		function contract() {
			clearTimeout( expandTimeout );
			if ( !$links.is( ':focus' ) ) {
				$middleBracket.css( 'visibility', 'visible' );
				$expandedOnly.css( 'visibility', 'hidden' );
				$heading.removeClass( 'mw-editsection-expanded' );
			}
		}

		$brackets = $( [ this.firstChild, this.lastChild ] );
		// @until Id27555c6 - essentially does this for us
		if ( !$brackets.hasClass( 'mw-editsection-bracket' ) ) {
			$brackets = $brackets
				.wrap( $( '<span>' ).addClass( 'mw-editsection-bracket' ) )
				.parent();
		}
		closingBracketSymbol = $brackets.eq( 1 ).text();
		$expandedOnly = $divider.add( $editSource ).add( $brackets.last() );
		$middleBracket = $brackets.last().clone();
		$hiddenBracket = $brackets.last().clone().css( 'visibility', 'hidden' );

		// Events
		$heading.on( { 'mouseenter': expandSoon, 'mouseleave': contractSoon } );
		$links.on( { 'focus': expand, 'blur': contract } );
		$edit.attr( 'href', veSectionEditUri.extend( {
			'vesection': sectionEditUri.query.section
		} ) );
		$edit.click( handler );

		// Initialization
		$expandedOnly.css( 'visibility', 'hidden' );
		$editSource
			.addClass( 'mw-editsection-link-secondary' )
			.text( mw.msg( 'visualeditor-ca-editsource-section' ) );
		$divider
			.addClass( 'mw-editsection-divider' )
			.text( dividerSymbol );
		$edit
			.addClass( 'mw-editsection-link-primary' )
			.after( $middleBracket, $divider, $hiddenBracket, $editSource );
	} );
};

/**
 * Add content and event bindings to toolbar buttons.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.setupToolbarButtons = function () {
	var editNoticeCount = ve.getObjectKeys( this.editNotices ).length;

	this.toolbarCancelButton = new ve.ui.ButtonWidget( { 'label': ve.msg( 'visualeditor-toolbar-cancel' ) } );
	this.toolbarSaveButton = new ve.ui.ButtonWidget( {
		'label': ve.msg( 'visualeditor-toolbar-savedialog' ),
		'flags': ['constructive'],
		'disabled': !this.restoring
	} );

	this.toolbarCancelButton.connect( this, { 'click': 'onToolbarCancelButtonClick' } );
	this.toolbarSaveButton.connect( this, { 'click': 'onToolbarSaveButtonClick' } );

	this.$toolbarMwMetaButton
		.addClass( 've-ui-icon-settings' )
		.append(
			$( '<span>' )
				.addClass( 've-init-mw-viewPageTarget-tool-label' )
				.text( ve.msg( 'visualeditor-meta-tool' ) )
		)
		.click( ve.bind( this.onToolbarMwMetaButtonClick, this ) );


	if ( editNoticeCount ) {
		this.$toolbarEditNoticesTool
			.addClass( 've-ui-icon-alert' )
			.append(
				$( '<span>' )
					.addClass( 've-init-mw-viewPageTarget-tool-label' )
					.text( ve.msg( 'visualeditor-editnotices-tool', editNoticeCount ) )
			)
			.append( this.$toolbarEditNotices )
			.click( ve.bind( this.onToolbarEditNoticesToolClick, this ) );
		this.$toolbarEditNotices.fadeIn( 'fast' );
	}

	this.$toolbarBetaNoticeTool
		.append(
			$( '<span>' )
				.addClass( 've-init-mw-viewPageTarget-tool-label ve-init-mw-viewPageTarget-tool-beta-label' )
				.text( ve.msg( 'visualeditor-beta-label' ) )
		)
		.append( this.$toolbarBetaNotice )
		.click( ve.bind( this.onToolbarBetaNoticeToolClick, this ) );

	this.$toolbarFeedbackTool
		.addClass( 've-ui-icon-comment' )
		.append(
			$( '<span>' )
				.addClass( 've-init-mw-viewPageTarget-tool-label' )
				.text( ve.msg( 'visualeditor-feedback-tool' ) )
		)
		.click( ve.bind( this.onToolbarFeedbackToolClick, this ) );
};

/**
 * Remove content and event bindings from toolbar buttons.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.tearDownToolbarButtons = function () {
	this.toolbarCancelButton.disconnect( this );
	this.toolbarSaveButton.disconnect( this );
	this.$toolbarMwMetaButton.empty().off( 'click' );
	this.$toolbarEditNoticesTool.empty().off( 'click' );
	this.$toolbarBetaNoticeTool.empty().off( 'click' );
	this.$toolbarFeedbackTool.empty().off( 'click' );
};

/**
 * Add the save button to the user interface.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.attachToolbarButtons = function () {
	var $target = this.toolbar.$actions;
	$target.append( this.$toolbarBetaNoticeTool );
	this.$toolbarBetaNotice.append( this.$toolbarFeedbackTool );

	if ( !ve.isEmptyObject( this.editNotices ) ) {
		$target.append( this.$toolbarEditNoticesTool );
	}
	$target.append(
		this.$toolbarMwMetaButton,
		this.toolbarCancelButton.$,
		this.toolbarSaveButton.$
	);
};

/**
 * Remove the save button from the user interface.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.detachToolbarButtons = function () {
	this.toolbarCancelButton.$.detach();
	this.toolbarSaveButton.$.detach();
	this.$toolbarMwMetaButton.detach();
	this.$toolbarEditNoticesTool.detach();
	this.$toolbarFeedbackTool.detach();
	this.$toolbarBetaNoticeTool.detach();
};

/**
 * Get a template for the save dialog.
 *
 * The result of this function depends on an API call, so the result it provided asynchronously.
 * The template will be wrapped in a plain `<div>` jQuery collection.
 *
 * @method
 * @param {Function} callback
 */
ve.init.mw.ViewPageTarget.prototype.getSaveDialogHtml = function ( callback ) {
	var viewPage = this,
		$wrap = $( '<div>' ).html( this.constructor.saveDialogTemplate );

	// Based on EditPage::getCheckboxes and EditPage::initialiseForm

	mw.user.getRights( function ( rights ) {
		// MediaWiki only allows usage of minor flag when editing an existing page
		// and the user has the right to use the feature.
		// If either is not the case, remove it from the form.
		if ( !viewPage.pageExists || ve.indexOf( 'minoredit', rights ) === -1 ) {
			$wrap
				.find( '.ve-init-mw-viewPageTarget-saveDialog-minorEdit-label, #ve-init-mw-viewPageTarget-saveDialog-minorEdit' )
				.remove();
		}

		if ( mw.user.isAnon() ) {
			$wrap
				.find( '.ve-init-mw-viewPageTarget-saveDialog-watchList-label, #ve-init-mw-viewPageTarget-saveDialog-watchList' )
				.remove();
		} else if (
			mw.user.options.get( 'watchdefault' ) ||
			( mw.user.options.get( 'watchcreations' ) && !viewPage.pageExists ) ||
			mw.config.get( 'wgVisualEditor' ).isPageWatched
		) {
			$wrap
				.find( '#ve-init-mw-viewPageTarget-saveDialog-watchList' )
				.prop( 'checked', true );
		}

		callback( $wrap );
	} );
};

/**
 * Add content and event bindings to the save dialog.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.setupSaveDialog = function () {
	var viewPage = this;

	// Save button on "save" slide
	this.saveDialogSaveButton = new ve.ui.ButtonWidget( {
		'label': ve.msg(
			 // visualeditor-savedialog-label-restore, visualeditor-savedialog-label-save
			'visualeditor-savedialog-label-' + ( viewPage.restoring ? 'restore' : 'save' )
		),
		'flags': ['constructive']
	} );
	this.saveDialogSaveButton.connect( this, { 'click': 'onSaveDialogSaveButtonClick' } );

	// Review button on "save" slide
	this.saveDialogReviewButton = new ve.ui.ButtonWidget( {
		'label': ve.msg(
			'visualeditor-savedialog-label-review'
		)
	} );
	this.saveDialogReviewButton.connect( this, { 'click': 'onSaveDialogReviewButtonClick' } );

	this.saveDialogReviewGoodButton = new ve.ui.ButtonWidget( {
		'label': ve.msg( 'visualeditor-savedialog-label-review-good' ),
		'flags': ['constructive']
	} );
	this.saveDialogReviewGoodButton.connect(
		this, { 'click': 'onSaveDialogReviewGoodButtonClick' }
	);

	this.saveDialogResolveConflictButton = new ve.ui.ButtonWidget( {
		'label': ve.msg( 'visualeditor-savedialog-label-resolve-conflict' ),
		'flags': ['constructive']
	} );
	this.saveDialogResolveConflictButton.connect( this, { 'click': 'onSaveDialogResolveConflictButtonClick' } );

	this.getSaveDialogHtml( function ( $wrap ) {
		viewPage.$saveDialog
			// Must not use replaceWith because that can't be used on fragement roots,
			// plus, we want to preserve the reference and class names of the wrapper.
			.empty().append( $wrap.contents() )
			// Attach buttons
			.find( '.ve-init-mw-viewPageTarget-saveDialog-slide-save' )
				.find( '.ve-init-mw-viewPageTarget-saveDialog-actions' )
					.prepend( viewPage.saveDialogSaveButton.$, viewPage.saveDialogReviewButton.$ )
					.end()
			.end()
			.find( '.ve-init-mw-viewPageTarget-saveDialog-slide-review' )
				.find( '.ve-init-mw-viewPageTarget-saveDialog-actions' )
					.prepend( viewPage.saveDialogReviewGoodButton.$ )
					.end()
			.end()
			.find( '.ve-init-mw-viewPageTarget-saveDialog-slide-conflict' )
				.find( '.ve-init-mw-viewPageTarget-saveDialog-actions' )
					.prepend( viewPage.saveDialogResolveConflictButton.$ )
					.end()
			.end()
			.find( '.ve-init-mw-viewPageTarget-saveDialog-closeButton' )
				.click( ve.bind( viewPage.onSaveDialogCloseButtonClick, viewPage ) )
				.end()
			.find( '.ve-init-mw-viewPageTarget-saveDialog-prevButton' )
				.click( ve.bind( viewPage.onSaveDialogPrevButtonClick, viewPage ) )
				.end()
			// Attach contents
			.find( '#ve-init-mw-viewPageTarget-saveDialog-editSummary' )
				.attr( {
					'placeholder': ve.msg( 'visualeditor-editsummary' )
				} )
				.placeholder()
				.byteLimit( viewPage.editSummaryByteLimit )
				.on( {
					'focus': function () {
						$( this ).parent().addClass(
							've-init-mw-viewPageTarget-saveDialog-summary-focused'
						);
					},
					'blur': function () {
						$( this ).parent().removeClass(
							've-init-mw-viewPageTarget-saveDialog-summary-focused'
						);
					},
					'keyup keydown mouseup cut paste change focus blur': function () {
						var $textarea = $( this ),
							$editSummaryCount = $textarea
								.closest( '.ve-init-mw-viewPageTarget-saveDialog-slide-save' )
									.find( '.ve-init-mw-viewPageTarget-saveDialog-editSummaryCount' );
						// TODO: This looks a bit weird, there is no unit in the UI, just numbers
						// Users likely assume characters but then it seems to count down quicker
						// than expected. Facing users with the word "byte" is bad? (bug 40035)
						setTimeout( function () {
							$editSummaryCount.text(
								viewPage.editSummaryByteLimit - $.byteLength( $textarea.val() )
							);
						} );
					}
				} )
				.end()
			.find( '.ve-init-mw-viewPageTarget-saveDialog-editSummaryCount' )
				.text( viewPage.editSummaryByteLimit )
				.end()
			.find( '.ve-init-mw-viewPageTarget-saveDialog-minorEdit-label' )
				.html( ve.init.platform.getParsedMessage( 'minoredit' ) )
				.find( 'a' )
					.attr( 'target', '_blank' )
					.end()
				.end()
			.find( '#ve-init-mw-viewPageTarget-saveDialog-minorEdit' )
				.prop( 'checked', +mw.user.options.get( 'minordefault' ) )
				.end()
			.find( '.ve-init-mw-viewPageTarget-saveDialog-watchList-label' )
				.html( ve.init.platform.getParsedMessage( 'watchthis' ) )
				.end()
			.find( '.ve-init-mw-viewPageTarget-saveDialog-license' )
				.html( ve.init.platform.getParsedMessage( 'copyrightwarning' ) )
				.end()
			.find( '.ve-init-mw-viewPageTarget-saveDialog-conflict' )
				.html( ve.init.platform.getParsedMessage( 'visualeditor-editconflict' ) )
				.end()
			.find( '.ve-init-mw-viewPageTarget-saveDialog-nochanges' )
				.html( ve.init.platform.getParsedMessage( 'visualeditor-diff-nochanges' ) )
		;
		// Get reference to loading icon
		viewPage.$saveDialogLoadingIcon = viewPage.$saveDialog
			.find( '.ve-init-mw-viewPageTarget-saveDialog-working' );
	} );
	// Hook onto the 'watch' event on by mediawiki.page.watch.ajax.js
	// Triggered when mw.page.watch.updateWatchLink(link, action) is called
	$( '#ca-watch, #ca-unwatch' )
		.on(
			'watchpage.mw',
			function ( e, action ) {
				viewPage.$saveDialog
					.find( '#ve-init-mw-viewPageTarget-saveDialog-watchList' )
					.prop( 'checked', ( action === 'watch' ) );
			}
		);
};

/**
 * Show the save dialog.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.showSaveDialog = function () {
	var viewPage = this;

	viewPage.surface.disable();

	viewPage.$toolbarBetaNotice.fadeOut( 'fast' );
	viewPage.$toolbarEditNotices.fadeOut( 'fast' );

	viewPage.swapSaveDialog( 'save' );

	viewPage.$saveDialog.fadeIn( 'fast', function () {
		// Initial size
		viewPage.onResizeSaveDialog();
	} );

	$( document ).on( 'keydown.ve-savedialog', function ( e ) {
		// Escape
		if ( e.which === 27 ) {
			viewPage.onSaveDialogCloseButtonClick();
		}
	} );

	$( window ).on( 'resize.ve-savedialog', ve.bind( viewPage.onResizeSaveDialog, viewPage ) );
};

/**
 * Update window-size related aspects of the save dialog
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.onResizeSaveDialog = function () {
	var $d = this.$saveDialog, $w = $( window );

	// Available space for css-height is window height,
	// without the space between the dialog and the window top,
	// without the space above/below between css-height and outerHeight.
	$d.css( 'max-height',
		$w.height() -
			( $d.offset().top - $w.scrollTop() ) -
			( $d.outerHeight( true ) - $d.height() ) -
			20 // shadow
	);
};

/**
 * Hide the save dialog
 */
ve.init.mw.ViewPageTarget.prototype.hideSaveDialog = function () {
	// Reset history on close (bug 49481)
	this.saveDialogSlideHistory.length = 0;
	this.$saveDialog.fadeOut( 'fast' );
	if ( this.$document ) {
		this.$document.focus();
	}
	$( document ).off( 'keydown.ve-savedialog' );
	$( window ).off( 'resize', this.onResizeSaveDialog );

	if ( this.surface ) {
		this.surface.enable();
	}
};

/**
 * Reset the fields of the save dialog.
 *
 * TODO: Maybe call this more cleverly only when the document changes, so that closing and
 * re-opening the saveDialog doesn't remove the user input and the diff cache.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.resetSaveDialog = function () {
	this.$saveDialog
		.find( '#ve-init-mw-viewPageTarget-saveDialog-editSummary' )
			.val( '' )
			.end()
		.find( '#ve-init-mw-viewPageTarget-saveDialog-minorEdit' )
			.prop( 'checked', false )
			.end()
		// Clear the diff
		.find( '.ve-init-mw-viewPageTarget-saveDialog-viewer' )
			.empty();
};

/**
 * Swap state in the save dialog.
 *
 * @method
 * @param {string} slide One of 'save', 'review', 'conflict' or 'nochanges'
 * @param {Object} [options]
 * @param {boolean} [options.fromHistory] Whether this swap was triggered from interaction
 *  with the slide history (e.g. surpresses pushing of target slide in the history again).
 * @returns {jQuery} The now active slide.
 * @throws {Error} Unknown saveDialog slide
 */
ve.init.mw.ViewPageTarget.prototype.swapSaveDialog = function ( slide, options ) {
	var $slide, $viewer,
		doc = this.surface.getModel().getDocument();

	if ( ve.indexOf( slide, [ 'save', 'review', 'conflict', 'nochanges' ] ) === -1 ) {
		throw new Error( 'Unknown saveDialog slide: ' + slide );
	}

	options = options || {};

	if ( !options.fromHistory ) {
		this.saveDialogSlideHistory.push( slide );
	}

	$slide = this.$saveDialog.find( '.ve-init-mw-viewPageTarget-saveDialog-slide-' + slide );

	this.$saveDialog
		// Hide "prev" button when (back) on the first slide
		.find( '.ve-init-mw-viewPageTarget-saveDialog-prevButton' )
			.toggle( this.saveDialogSlideHistory.length >= 2 )
			.end()
		// Update title to one of:
		// - visualeditor-savedialog-title-save
		// - visualeditor-savedialog-title-review
		// - visualeditor-savedialog-title-conflict
		// - visualeditor-savedialog-title-nochanges
		.find( '.ve-init-mw-viewPageTarget-saveDialog-title' )
			.text( ve.msg( 'visualeditor-savedialog-title-' + slide ) )
			.end()
		// Hide other slides
		.find( '.ve-init-mw-viewPageTarget-saveDialog-slide' )
			.not( $slide )
				.hide();

	if ( slide === 'review' ) {
		$viewer = $slide.find( '.ve-init-mw-viewPageTarget-saveDialog-viewer' );
		if ( !$viewer.find( 'table, pre' ).length ) {
			this.saveDialogReviewGoodButton.setDisabled( true );
			this.$saveDialogLoadingIcon.show();
			if ( this.pageExists ) {
				// Has no callback, handled via target.onShowChanges
				this.showChanges(
					ve.dm.converter.getDomFromData( doc.getFullData(), doc.getStore(), doc.getInternalList() )
				);
			} else {
				this.serialize(
					ve.dm.converter.getDomFromData( doc.getFullData(), doc.getStore(), doc.getInternalList() ),
					ve.bind( this.onSerialize, this )
				);
			}
		}
		this.$saveDialog.css( 'width', '100%' );
	} else {
		this.$saveDialog.css( 'width', '' );
	}

	// Warnings should not persist after slide changes
	this.clearAllWarnings();

	// Show the target slide
	$slide.show();

	if ( slide === 'save' ) {
		setTimeout( function () {
			$slide.find( 'textarea' ).eq( 0 ).focus();
		} );
	}

	return $slide;
};

/**
 * Add the save dialog to the user interface.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.attachSaveDialog = function () {
	this.surface.$globalOverlay.append(
		this.$toolbarTracker.append(
			this.$saveDialog
		)
	);
};

/**
 * Remove the save dialog from the user interface.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.detachSaveDialog = function () {
	this.$saveDialog.detach();
};

/**
 * Remember the window's scroll position.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.saveScrollPosition = function () {
	this.scrollTop = $( window ).scrollTop();
};

/**
 * Restore the window's scroll position.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.restoreScrollPosition = function () {
	if ( this.scrollTop ) {
		$( window ).scrollTop( this.scrollTop );
		this.scrollTop = null;
	}
};

/**
 * Show the loading spinner.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.showSpinner = function () {
	$( '#firstHeading' ).prepend( this.$spinner );
};

/**
 * Hide the loading spinner.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.hideSpinner = function () {
	this.$spinner.detach();
};

/**
 * Show the page content.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.showPageContent = function () {
	$( '#bodyContent > .ve-init-mw-viewPageTarget-content' )
		.removeClass( 've-init-mw-viewPageTarget-content' )
		.show()
		.fadeTo( 0, 1 );
};

/**
 * Mute the page content.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.mutePageContent = function () {
	$( '#bodyContent > :visible:not(#siteSub, #contentSub)' )
		.addClass( 've-init-mw-viewPageTarget-content' )
		.fadeTo( 'fast', 0.6 );
};

/**
 * Hide the page content.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.hidePageContent = function () {
	$( '#bodyContent > :visible:not(#siteSub, #contentSub)' )
		.addClass( 've-init-mw-viewPageTarget-content' )
		.hide();
};

/**
 * Show the table of contents in the view mode.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.showTableOfContents = function () {
	var $toc = $( '#toc' ),
		$wrap = $toc.parent();
	if ( $wrap.data( 've.hideTableOfContents' ) ) {
		$wrap.slideDown( function () {
			$toc.unwrap();
		} );
	}
};

/**
 * Hide the table of contents in the view mode.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.hideTableOfContents = function () {
	$( '#toc' )
		.wrap( '<div>' )
		.parent()
			.data( 've.hideTableOfContents', true )
			.slideUp();
};

/**
 * Show the toolbar.
 *
 * This also transplants the toolbar to a new location.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.setUpToolbar = function () {
	this.toolbar = new ve.ui.Toolbar( this.surface, { 'shadow': true, 'actions': true } );
	this.toolbar.addTools( this.constructor.static.toolbarTools );
	this.surface.addCommands( this.constructor.static.surfaceCommands );
	if ( !this.isMobileDevice ) {
		this.toolbar.enableFloating();
	}
	this.toolbar.$
		.addClass( 've-init-mw-viewPageTarget-toolbar' )
		.insertBefore( '#firstHeading' );
	this.toolbar.$bar.slideDown( 'fast', ve.bind( function () {
		// Check the surface wasn't torn down while the toolbar was animating
		if ( this.surface ) {
			this.surface.getContext().update();

			// Emit event for initial position. Must be done here after the
			// slide down instead of in ve.ui.Toolbar#constructor because
			// back there it'll still be out of view.
			this.surface.emit( 'toolbarPosition', this.toolbar.$bar );
		}
	}, this ) );
};

/**
 * Hide the toolbar.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.tearDownToolbar = function () {
	this.toolbar.$bar.slideUp( 'fast', ve.bind( function () {
		this.toolbar.destroy();
		this.toolbar = null;
	}, this ) );
};

/**
 * Transform the page title into a VE-style title.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.transformPageTitle = function () {
	$( '#firstHeading' ).addClass( 've-init-mw-viewPageTarget-pageTitle' );
};

/**
 * Fade the page title to indicate it is not editable.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.mutePageTitle = function () {
	$( '#firstHeading, #siteSub:visible, #contentSub:visible' ).fadeTo( 'fast', 0.6 );
};

/**
 * Restore the page title to its original style.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.restorePageTitle = function () {
	$( '#firstHeading, #siteSub:visible, #contentSub:visible' ).fadeTo( 'fast', 1 );
	setTimeout( function () {
		$( '#firstHeading' ).removeClass( 've-init-mw-viewPageTarget-pageTitle' );
	}, 1000 );
};

/**
 * Change the document title to state that we are now editing.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.changeDocumentTitle = function () {
	document.title = ve.msg(
		this.pageExists ? 'editing' : 'creating',
		mw.config.get( 'wgTitle' )
	) + ' - ' + mw.config.get( 'wgSiteName' );
};

/**
 * Restore the original document title.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.restoreDocumentTitle = function () {
	document.title = this.originalDocumentTitle;
};

/**
 * Page modifications for switching to edit mode.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.transformPage = function () {
	var uri;

	// Put skin tabs in "edit" mode
	$( $( '#p-views' ).length ? '#p-views' : '#p-cactions' )
		.find( 'li.selected' ).removeClass( 'selected' );
	$( this.tabLayout === 'add' ? '#ca-ve-edit' : '#ca-edit' )
		.addClass( 'selected' );

	// Hide site notice (if present)
	$( '#siteNotice:visible' )
		.addClass( 've-hide' )
		.slideUp( 'fast' );

	// Push veaction=edit url in history (if not already. If we got here by a veaction=edit
	// permalink then it will be there already and the constructor called #activate)
	if ( !this.actFromPopState && window.history.pushState && this.currentUri.query.veaction !== 'edit' ) {
		// Set the veaction query parameter
		uri = this.currentUri;
		uri.query.veaction = 'edit';

		window.history.pushState( null, document.title, uri );
	}
	this.actFromPopState = false;
};

/**
 * Page modifications for switching back to view mode.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.restorePage = function () {
	var uri;

	// Put skin tabs back in "view" mode
	$( $( '#p-views' ).length ? '#p-views' : '#p-cactions' )
		.find( 'li.selected' ).removeClass( 'selected' );
	$( '#ca-view' ).addClass( 'selected' );


	// Make site notice visible again (if present)
	$( '#siteNotice.ve-hide' )
		.slideDown( 'fast' );

	// Push non-veaction=edit url in history
	if ( !this.actFromPopState && window.history.pushState ) {
		// Remove the veaction query parameter
		uri = this.currentUri;
		if ( 'veaction' in uri.query ) {
			delete uri.query.veaction;
		}

		// If there are other query parameters, set the url to the current url (with veaction removed).
		// Otherwise use the canonical style view url (bug 42553).
		if ( ve.getObjectValues( uri.query ).length ) {
			window.history.pushState( null, document.title, uri );
		} else {
			window.history.pushState( null, document.title, this.viewUri );
		}
	}
	this.actFromPopState = false;
};

/**
 * @param {Event} e Native event object
 */
ve.init.mw.ViewPageTarget.prototype.onWindowPopState = function () {
	var newUri = this.currentUri = new mw.Uri( document.location.href );
	if ( !this.active && newUri.query.veaction === 'edit' ) {
		this.actFromPopState = true;
		this.activate();
	}
	if ( this.active && newUri.query.veaction !== 'edit' ) {
		this.actFromPopState = true;
		this.deactivate();
	}
};

/**
 * Replace the page content with new HTML.
 *
 * @method
 * @param {HTMLElement} html Rendered HTML from server
 */
ve.init.mw.ViewPageTarget.prototype.replacePageContent = function ( html ) {
	$( '#mw-content-text' ).html( html );
};

/**
 * Get the numeric index of a section in the page.
 *
 * @method
 * @param {HTMLElement} heading Heading element of section
 */
ve.init.mw.ViewPageTarget.prototype.getEditSection = function ( heading ) {
	var $page = $( '#mw-content-text' ),
		section = 0;
	$page.find( 'h1, h2, h3, h4, h5, h6' ).not( '#toc h2' ).each( function () {
		section++;
		if ( this === heading ) {
			return false;
		}
	} );
	return section;
};

/**
 * Get the numeric index of a section in the page.
 *
 * @method
 * @param {HTMLElement} heading Heading element of section
 */
ve.init.mw.ViewPageTarget.prototype.saveEditSection = function ( heading ) {
	this.section = this.getEditSection( heading );
};

/**
 * Move the cursor in the editor to a given section.
 *
 * @method
 * @param {number} section Section to move cursor to
 */
ve.init.mw.ViewPageTarget.prototype.restoreEditSection = function () {
	if ( this.section !== null ) {
		var offset,
			target = this,
			surfaceView = this.surface.getView(),
			surfaceModel = surfaceView.getModel();
		this.$document.find( 'h1, h2, h3, h4, h5, h6' ).eq( this.section - 1 ).each( function () {
			var offsetNode, nextNode,
				headingNode = $( this ).data( 'view' ),
				lastHeadingLevel = -1;

			if ( headingNode ) {
				// Find next sibling which isn't a heading
				offsetNode = headingNode;
				while ( offsetNode instanceof ve.ce.HeadingNode && offsetNode.getModel().getAttribute( 'level' ) > lastHeadingLevel ) {
					lastHeadingLevel = offsetNode.getModel().getAttribute( 'level' );
					// Next sibling
					nextNode = offsetNode.parent.children[ve.indexOf( offsetNode, offsetNode.parent.children ) + 1];
					if ( !nextNode ) {
						break;
					}
					offsetNode = nextNode;
				}
				offset = surfaceModel.getDocument().data.getNearestContentOffset(
					offsetNode.getModel().getOffset(), 1
				);
				surfaceModel.change( null, new ve.Range( offset ) );
				// Scroll to heading:
				// Wait for toolbar to animate in so we can account for its height
				setTimeout( function () {
					var $window = $( ve.Element.static.getWindow( target.$ ) );
					$window.scrollTop( headingNode.$.offset().top - target.toolbar.$.height() );
				}, 200 );
			}
		} );
		this.section = null;
	}
};

/**
 * Show an inline warning.
 * @param {string} name Warning's unique name
 * @param {string} messageHtml Warning message HTML
 */
ve.init.mw.ViewPageTarget.prototype.showWarning = function ( name, messageHtml ) {
	if ( !this.warnings[name] ) {
		var warning = $(
			'<p class="ve-init-mw-viewPageTarget-saveDialog-warning">' + messageHtml + '</p>'
		);
		this.$saveDialog
			.find( '.ve-init-mw-viewPageTarget-saveDialog-warnings' )
				.append( warning );
		this.warnings[name] = warning;
	}
};

/**
 * Remove an inline warning.
 * @param {string} name Warning's unique name
 */
ve.init.mw.ViewPageTarget.prototype.clearWarning = function ( name ) {
	if ( this.warnings[name] ) {
		this.warnings[name].remove();
		delete this.warnings[name];
	}
};

/**
 * Remove all inline warnings.
 */
ve.init.mw.ViewPageTarget.prototype.clearAllWarnings = function () {
	this.$saveDialog
		.find( '.ve-init-mw-viewPageTarget-saveDialog-warnings' )
			.empty();
	this.warnings = {};
};

/**
 * Add onbeforunload handler.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.setupBeforeUnloadHandler = function () {
	// Remember any already set on before unload handler
	this.onBeforeUnloadFallback = window.onbeforeunload;
	// Attach before unload handler
	window.onbeforeunload = this.onBeforeUnloadHandler = ve.bind( this.onBeforeUnload, this );
	// Attach page show handlers
	if ( window.addEventListener ) {
		window.addEventListener( 'pageshow', ve.bind( this.onPageShow, this ), false );
	} else if ( window.attachEvent ) {
		window.attachEvent( 'pageshow', ve.bind( this.onPageShow, this ) );
	}
};

/**
 * Remove onbeforunload handler.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.tearDownBeforeUnloadHandler = function () {
	// Restore whatever previous onbeforeload hook existed
	window.onbeforeunload = this.onBeforeUnloadFallback;
};

/**
 * Handle page show event.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.onPageShow = function () {
	// Re-add onbeforeunload handler
	window.onbeforeunload = this.onBeforeUnloadHandler;
};

/**
 * Handle before unload event.
 *
 * @method
 */
ve.init.mw.ViewPageTarget.prototype.onBeforeUnload = function () {
	var fallbackResult,
		message,
		onBeforeUnloadHandler = this.onBeforeUnloadHandler;
	// Check if someone already set on onbeforeunload hook
	if ( this.onBeforeUnloadFallback ) {
		// Get the result of their onbeforeunload hook
		fallbackResult = this.onBeforeUnloadFallback();
	}
	// Check if their onbeforeunload hook returned something
	if ( fallbackResult !== undefined ) {
		// Exit here, returning their message
		message = fallbackResult;
	} else {
		// Override if submitting
		if ( this.submitting ) {
			return null;
		}
		// Check if there's been an edit
		if ( this.surface && this.edited ) {
			// Return our message
			message = ve.msg( 'visualeditor-viewpage-savewarning' );
		}
	}
	// Unset the onbeforeunload handler so we don't break page caching in Firefox
	window.onbeforeunload = null;
	if ( message !== undefined ) {
		// ...but if the user chooses not to leave the page, we need to rebind it
		setTimeout( function () {
			window.onbeforeunload = onBeforeUnloadHandler;
		} );
		return message;
	}
};

/* Initialization */

ve.init.mw.targets.push( new ve.init.mw.ViewPageTarget() );