/**

 * @output wp-includes/js/wp-backbone.js

 */

/** @namespace wp */

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

(function ($) {

	/**

	 * Create the WordPress Backbone namespace.

	 *

	 * @namespace wp.Backbone

	 */

	wp.Backbone = {};

	/**

	 * A backbone subview manager.

	 *

	 * @since 3.5.0

	 * @since 3.6.0 Moved wp.media.Views to wp.Backbone.Subviews.

	 *

	 * @memberOf wp.Backbone

	 *

	 * @class

	 *

	 * @param {wp.Backbone.View} view  The main view.

	 * @param {Array|Object}     views The subviews for the main view.

	 */

	wp.Backbone.Subviews = function( view, views ) {

		this.view = view;

		this._views = _.isArray( views ) ? { '': views } : views || {};

	};

	wp.Backbone.Subviews.extend = Backbone.Model.extend;

	_.extend( wp.Backbone.Subviews.prototype, {

		/**

		 * Fetches all of the subviews.

		 *

		 * @since 3.5.0

		 *

		 * @return {Array} All the subviews.

		 */

		all: function() {

			return _.flatten( _.values( this._views ) );

		},

		/**

		 * Fetches all subviews that match a given `selector`.

		 *

		 * If no `selector` is provided, it will grab all subviews attached

		 * to the view's root.

		 *

		 * @since 3.5.0

		 *

		 * @param {string} selector A jQuery selector.

		 *

		 * @return {Array} All the subviews that match the selector.

		 */

		get: function( selector ) {

			selector = selector || '';

			return this._views[ selector ];

		},

		/**

		 * Fetches the first subview that matches a given `selector`.

		 *

		 * If no `selector` is provided, it will grab the first subview attached to the

		 * view's root.

		 *

		 * Useful when a selector only has one subview at a time.

		 *

		 * @since 3.5.0

		 *

		 * @param {string} selector A jQuery selector.

		 *

		 * @return {Backbone.View} The view.

		 */

		first: function( selector ) {

			var views = this.get( selector );

			return views && views.length ? views[0] : null;

		},

		/**

		 * Registers subview(s).

		 *

		 * Registers any number of `views` to a `selector`.

		 *

		 * When no `selector` is provided, the root selector (the empty string)

		 * is used. `views` accepts a `Backbone.View` instance or an array of

		 * `Backbone.View` instances.

		 *

		 * ---

		 *

		 * Accepts an `options` object, which has a significant effect on the

		 * resulting behavior.

		 *

		 * `options.silent` - *boolean, `false`*

		 * If `options.silent` is true, no DOM modifications will be made.

		 *

		 * `options.add` - *boolean, `false`*

		 * Use `Views.add()` as a shortcut for setting `options.add` to true.

		 *

		 * By default, the provided `views` will replace any existing views

		 * associated with the selector. If `options.add` is true, the provided

		 * `views` will be added to the existing views.

		 *

		 * `options.at` - *integer, `undefined`*

		 * When adding, to insert `views` at a specific index, use `options.at`.

		 * By default, `views` are added to the end of the array.

		 *

		 * @since 3.5.0

		 *

		 * @param {string}       selector A jQuery selector.

		 * @param {Array|Object} views    The subviews for the main view.

		 * @param {Object}       options  Options for call. If `options.silent` is true,

		 *                                no DOM  modifications will be made. Use

		 *                                `Views.add()` as a shortcut for setting

		 *                                `options.add` to true. If `options.add` is

		 *                                true, the provided `views` will be added to

		 *                                the existing views. When adding, to insert

		 *                                `views` at a specific index, use `options.at`.

		 *

		 * @return {wp.Backbone.Subviews} The current Subviews instance.

		 */

		set: function( selector, views, options ) {

			var existing, next;

			if ( ! _.isString( selector ) ) {

				options  = views;

				views    = selector;

				selector = '';

			}

			options  = options || {};

			views    = _.isArray( views ) ? views : [ views ];

			existing = this.get( selector );

			next     = views;

			if ( existing ) {

				if ( options.add ) {

					if ( _.isUndefined( options.at ) ) {

						next = existing.concat( views );

					} else {

						next = existing;

						next.splice.apply( next, [ options.at, 0 ].concat( views ) );

					}

				} else {

					_.each( next, function( view ) {

						view.__detach = true;

					});

					_.each( existing, function( view ) {

						if ( view.__detach )

							view.$el.detach();

						else

							view.remove();

					});

					_.each( next, function( view ) {

						delete view.__detach;

					});

				}

			}

			this._views[ selector ] = next;

			_.each( views, function( subview ) {

				var constructor = subview.Views || wp.Backbone.Subviews,

					subviews = subview.views = subview.views || new constructor( subview );

				subviews.parent   = this.view;

				subviews.selector = selector;

			}, this );

			if ( ! options.silent )

				this._attach( selector, views, _.extend({ ready: this._isReady() }, options ) );

			return this;

		},

		/**

		 * Add subview(s) to existing subviews.

		 *

		 * An alias to `Views.set()`, which defaults `options.add` to true.

		 *

		 * Adds any number of `views` to a `selector`.

		 *

		 * When no `selector` is provided, the root selector (the empty string)

		 * is used. `views` accepts a `Backbone.View` instance or an array of

		 * `Backbone.View` instances.

		 *

		 * Uses `Views.set()` when setting `options.add` to `false`.

		 *

		 * Accepts an `options` object. By default, provided `views` will be

		 * inserted at the end of the array of existing views. To insert

		 * `views` at a specific index, use `options.at`. If `options.silent`

		 * is true, no DOM modifications will be made.

		 *

		 * For more information on the `options` object, see `Views.set()`.

		 *

		 * @since 3.5.0

		 *

		 * @param {string}       selector A jQuery selector.

		 * @param {Array|Object} views    The subviews for the main view.

		 * @param {Object}       options  Options for call.  To insert `views` at a

		 *                                specific index, use `options.at`. If

		 *                                `options.silent` is true, no DOM modifications

		 *                                will be made.

		 *

		 * @return {wp.Backbone.Subviews} The current subviews instance.

		 */

		add: function( selector, views, options ) {

			if ( ! _.isString( selector ) ) {

				options  = views;

				views    = selector;

				selector = '';

			}

			return this.set( selector, views, _.extend({ add: true }, options ) );

		},

		/**

		 * Removes an added subview.

		 *

		 * Stops tracking `views` registered to a `selector`. If no `views` are

		 * set, then all of the `selector`'s subviews will be unregistered and

		 * removed.

		 *

		 * Accepts an `options` object. If `options.silent` is set, `remove`

		 * will *not* be triggered on the unregistered views.

		 *

		 * @since 3.5.0

		 *

		 * @param {string}       selector A jQuery selector.

		 * @param {Array|Object} views    The subviews for the main view.

		 * @param {Object}       options  Options for call. If `options.silent` is set,

		 *                                `remove` will *not* be triggered on the

		 *                                unregistered views.

		 *

		 * @return {wp.Backbone.Subviews} The current Subviews instance.

		 */

		unset: function( selector, views, options ) {

			var existing;

			if ( ! _.isString( selector ) ) {

				options = views;

				views = selector;

				selector = '';

			}

			views = views || [];

			if ( existing = this.get( selector ) ) {

				views = _.isArray( views ) ? views : [ views ];

				this._views[ selector ] = views.length ? _.difference( existing, views ) : [];

			}

			if ( ! options || ! options.silent )

				_.invoke( views, 'remove' );

			return this;

		},

		/**

		 * Detaches all subviews.

		 *

		 * Helps to preserve all subview events when re-rendering the master

		 * view. Used in conjunction with `Views.render()`.

		 *

		 * @since 3.5.0

		 *

		 * @return {wp.Backbone.Subviews} The current Subviews instance.

		 */

		detach: function() {

			$( _.pluck( this.all(), 'el' ) ).detach();

			return this;

		},

		/**

		 * Renders all subviews.

		 *

		 * Used in conjunction with `Views.detach()`.

		 *

		 * @since 3.5.0

		 *

		 * @return {wp.Backbone.Subviews} The current Subviews instance.

		*/

		render: function() {

			var options = {

					ready: this._isReady()

				};

			_.each( this._views, function( views, selector ) {

				this._attach( selector, views, options );

			}, this );

			this.rendered = true;

			return this;

		},

		/**

		 * Removes all subviews.

		 *

		 * Triggers the `remove()` method on all subviews. Detaches the master

		 * view from its parent. Resets the internals of the views manager.

		 *

		 * Accepts an `options` object. If `options.silent` is set, `unset`

		 * will *not* be triggered on the master view's parent.

		 *

		 * @since 3.6.0

		 *

		 * @param {Object}  options        Options for call.

		 *                                 the master views' parent.

		 *

		 * @return {wp.Backbone.Subviews} The current Subviews instance.

		*/

		remove: function( options ) {

			if ( ! options || ! options.silent ) {

				if ( this.parent && this.parent.views )

					this.parent.views.unset( this.selector, this.view, { silent: true });

				delete this.parent;

				delete this.selector;

			}

			_.invoke( this.all(), 'remove' );

			this._views = [];

			return this;

		},

		/**

		 * Replaces a selector's subviews

		 *

		 * By default, sets the `$target` selector's html to the subview `els`.

		 *

		 * Can be overridden in subclasses.

		 *

		 * @since 3.5.0

		 *

		 * @param {string} $target Selector where to put the elements.

		 * @param {*} els HTML or elements to put into the selector's HTML.

		 *

		 * @return {wp.Backbone.Subviews} The current Subviews instance.

		 */

		replace: function( $target, els ) {

			$target.html( els );

			return this;

		},

		/**

		 * Insert subviews into a selector.

		 *

		 * By default, appends the subview `els` to the end of the `$target`

		 * selector. If `options.at` is set, inserts the subview `els` at the

		 * provided index.

		 *

		 * Can be overridden in subclasses.

		 *

		 * @since 3.5.0

		 *

		 * @param {string}  $target    Selector where to put the elements.

		 * @param {*}       els        HTML or elements to put at the end of the

		 *                             $target.

		 * @param {?Object} options    Options for call.

		 * @param {?number} options.at At which index to put the elements.

		 *

		 * @return {wp.Backbone.Subviews} The current Subviews instance.

		 */

		insert: function( $target, els, options ) {

			var at = options && options.at,

				$children;

			if ( _.isNumber( at ) && ($children = $target.children()).length > at )

				$children.eq( at ).before( els );

			else

				$target.append( els );

			return this;

		},

		/**

		 * Triggers the ready event.

		 *

		 * Only use this method if you know what you're doing. For performance reasons,

		 * this method does not check if the view is actually attached to the DOM. It's

		 * taking your word for it.

		 *

		 * Fires the ready event on the current view and all attached subviews.

		 *

		 * @since 3.5.0

		 */

		ready: function() {

			this.view.trigger('ready');

			// Find all attached subviews, and call ready on them.

			_.chain( this.all() ).map( function( view ) {

				return view.views;

			}).flatten().where({ attached: true }).invoke('ready');