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 * @file Revisions interface functions, Backbone classes and
 * the revisions.php document.ready bootstrap.
 *
 * @output wp-admin/js/revisions.js
 */

/* global isRtl */

window.wp = window.wp || {};

(function($) {
	var revisions;
	/**
	 * Expose the module in window.wp.revisions.
	 */
	revisions = wp.revisions = { model: {}, view: {}, controller: {} };

	// Link post revisions data served from the back end.
	revisions.settings = window._wpRevisionsSettings || {};

	// For debugging.
	revisions.debug = false;

	/**
	 * wp.revisions.log
	 *
	 * A debugging utility for revisions. Works only when a
	 * debug flag is on and the browser supports it.
	 */
	revisions.log = function() {
		if ( window.console && revisions.debug ) {
			window.console.log.apply( window.console, arguments );
		}
	};

	// Handy functions to help with positioning.
	$.fn.allOffsets = function() {
		var offset = this.offset() || {top: 0, left: 0}, win = $(window);
		return _.extend( offset, {
			right:  win.width()  - offset.left - this.outerWidth(),
			bottom: win.height() - offset.top  - this.outerHeight()
		});
	};

	$.fn.allPositions = function() {
		var position = this.position() || {top: 0, left: 0}, parent = this.parent();
		return _.extend( position, {
			right:  parent.outerWidth()  - position.left - this.outerWidth(),
			bottom: parent.outerHeight() - position.top  - this.outerHeight()
		});
	};

	/**
	 * ========================================================================
	 * MODELS
	 * ========================================================================
	 */
	revisions.model.Slider = Backbone.Model.extend({
		defaults: {
			value: null,
			values: null,
			min: 0,
			max: 1,
			step: 1,
			range: false,
			compareTwoMode: false
		},

		initialize: function( options ) {
			this.frame = options.frame;
			this.revisions = options.revisions;

			// Listen for changes to the revisions or mode from outside.
			this.listenTo( this.frame, 'update:revisions', this.receiveRevisions );
			this.listenTo( this.frame, 'change:compareTwoMode', this.updateMode );

			// Listen for internal changes.
			this.on( 'change:from', this.handleLocalChanges );
			this.on( 'change:to', this.handleLocalChanges );
			this.on( 'change:compareTwoMode', this.updateSliderSettings );
			this.on( 'update:revisions', this.updateSliderSettings );

			// Listen for changes to the hovered revision.
			this.on( 'change:hoveredRevision', this.hoverRevision );

			this.set({
				max:   this.revisions.length - 1,
				compareTwoMode: this.frame.get('compareTwoMode'),
				from: this.frame.get('from'),
				to: this.frame.get('to')
			});
			this.updateSliderSettings();
		},

		getSliderValue: function( a, b ) {
			return isRtl ? this.revisions.length - this.revisions.indexOf( this.get(a) ) - 1 : this.revisions.indexOf( this.get(b) );
		},

		updateSliderSettings: function() {
			if ( this.get('compareTwoMode') ) {
				this.set({
					values: [
						this.getSliderValue( 'to', 'from' ),
						this.getSliderValue( 'from', 'to' )
					],
					value: null,
					range: true // Ensures handles cannot cross.
				});
			} else {
				this.set({
					value: this.getSliderValue( 'to', 'to' ),
					values: null,
					range: false
				});
			}
			this.trigger( 'update:slider' );
		},

		// Called when a revision is hovered.
		hoverRevision: function( model, value ) {
			this.trigger( 'hovered:revision', value );
		},

		// Called when `compareTwoMode` changes.
		updateMode: function( model, value ) {
			this.set({ compareTwoMode: value });
		},

		// Called when `from` or `to` changes in the local model.
		handleLocalChanges: function() {
			this.frame.set({
				from: this.get('from'),
				to: this.get('to')
			});
		},

		// Receives revisions changes from outside the model.
		receiveRevisions: function( from, to ) {
			// Bail if nothing changed.
			if ( this.get('from') === from && this.get('to') === to ) {
				return;
			}

			this.set({ from: from, to: to }, { silent: true });
			this.trigge