/**
 * wp.media.view.AttachmentsBrowser
 *
 * @class
 * @augments wp.media.View
 * @augments wp.Backbone.View
 * @augments Backbone.View
 *
 * @param {object}         [options]               The options hash passed to the view.
 * @param {boolean|string} [options.filters=false] Which filters to show in the browser's toolbar.
 *                                                 Accepts 'uploaded' and 'all'.
 * @param {boolean}        [options.search=true]   Whether to show the search interface in the
 *                                                 browser's toolbar.
 * @param {boolean}        [options.date=true]     Whether to show the date filter in the
 *                                                 browser's toolbar.
 * @param {boolean}        [options.display=false] Whether to show the attachments display settings
 *                                                 view in the sidebar.
 * @param {boolean|string} [options.sidebar=true]  Whether to create a sidebar for the browser.
 *                                                 Accepts true, false, and 'errors'.
 */
var View = wp.media.View,
	mediaTrash = wp.media.view.settings.mediaTrash,
	l10n = wp.media.view.l10n,
	$ = jQuery,
	AttachmentsBrowser;

AttachmentsBrowser = View.extend({
	tagName:   'div',
	className: 'attachments-browser',

	initialize: function() {
		_.defaults( this.options, {
			filters: false,
			search:  true,
			date:    true,
			display: false,
			sidebar: true,
			AttachmentView: wp.media.view.Attachment.Library
		});

		this.controller.on( 'toggle:upload:attachment', this.toggleUploader, this );
		this.controller.on( 'edit:selection', this.editSelection );
		this.createToolbar();
		this.createUploader();
		this.createAttachments();
		if ( this.options.sidebar ) {
			this.createSidebar();
		}
		this.updateContent();

		if ( ! this.options.sidebar || 'errors' === this.options.sidebar ) {
			this.$el.addClass( 'hide-sidebar' );

			if ( 'errors' === this.options.sidebar ) {
				this.$el.addClass( 'sidebar-for-errors' );
			}
		}

		this.collection.on( 'add remove reset', this.updateContent, this );
	},

	editSelection: function( modal ) {
		modal.$( '.media-button-backToLibrary' ).focus();
	},

	/**
	 * @returns {wp.media.view.AttachmentsBrowser} Returns itself to allow chaining
	 */
	dispose: function() {
		this.options.selection.off( null, null, this );
		View.prototype.dispose.apply( this, arguments );
		return this;
	},

	createToolbar: function() {
		var LibraryViewSwitcher, Filters, toolbarOptions;

		toolbarOptions = {
			controller: this.controller
		};

		if ( this.controller.isModeActive( 'grid' ) ) {
			toolbarOptions.className = 'media-toolbar wp-filter';
		}

		/**
		* @member {wp.media.view.Toolbar}
		*/
		this.toolbar = new wp.media.view.Toolbar( toolbarOptions );

		this.views.add( this.toolbar );

		this.toolbar.set( 'spinner', new wp.media.view.Spinner({
			priority: -60
		}) );

		if ( -1 !== $.inArray( this.options.filters, [ 'uploaded', 'all' ] ) ) {
			// "Filters" will return a <select>, need to render
			// screen reader text before
			this.toolbar.set( 'filtersLabel', new wp.media.view.Label({
				value: l10n.filterByType,
				attributes: {
					'for':  'media-attachment-filters'
				},
				priority:   -80
			}).render() );

			if ( 'uploaded' === this.options.filters ) {
				this.toolbar.set( 'filters', new wp.media.view.AttachmentFilters.Uploaded({
					controller: this.controller,
					model:      this.collection.props,
					priority:   -80
				}).render() );
			} else {
				Filters = new wp.media.view.AttachmentFilters.All({
					controller: this.controller,
					model:      this.collection.props,
					priority:   -80
				});

				this.toolbar.set( 'filters', Filters.render() );
			}
		}

		// Feels odd to bring the global media library switcher into the Attachment
		// browser view. Is this a use case for doAction( 'add:toolbar-items:attachments-browser', this.toolbar );
		// which the controller can tap into and add this view?
		if ( this.controller.isModeActive( 'grid' ) ) {
			LibraryViewSwitcher = View.extend({
				className: 'view-switch media-grid-view-switch',
				template: wp.template( 'media-library-view-switcher')
			});

			this.toolbar.set( 'libraryViewSwitcher', new LibraryViewSwitcher({
				controller: this.controller,
				priority: -90
			}).render() );

			// DateFilter is a <select>, screen reader text needs to be rendered before
			this.toolbar.set( 'dateFilterLabel', new wp.media.view.Label({
				value: l10n.filterByDate,
				attributes: {
					'for': 'media-attachment-date-filters'
				},
				priority: -75
			}).render() );
			this.toolbar.set( 'dateFilter', new wp.media.view.DateFilter({
				controller: this.controller,
				model:      this.collection.props,
				priority: -75
			}).render() );

			// BulkSelection is a <div> with subviews, including screen reader text
			this.toolbar.set( 'selectModeToggleButton', new wp.media.view.SelectModeToggleButton({
				text: l10n.bulkSelect,
				controller: this.controller,
				priority: -70
			}).render() );

			this.toolbar.set( 'deleteSelectedButton', new wp.media.view.DeleteSelectedButton({
				filters: Filters,
				style: 'primary',
				disabled: true,
				text: mediaTrash ? l10n.trashSelected : l10n.deleteSelected,
				controller: this.controller,
				priority: -60,
				click: function() {
					var changed = [], removed = [],
						selection = this.controller.state().get( 'selection' ),
						library = this.controller.state().get( 'library' );

					if ( ! selection.length ) {
						return;
					}

					if ( ! mediaTrash && ! window.confirm( l10n.warnBulkDelete ) ) {
						return;
					}

					if ( mediaTrash &&
						'trash' !== selection.at( 0 ).get( 'status' ) &&
						! window.confirm( l10n.warnBulkTrash ) ) {

						return;
					}

					selection.each( function( model ) {
						if ( ! model.get( 'nonces' )['delete'] ) {
							removed.push( model );
							return;
						}

						if ( mediaTrash && 'trash' === model.get( 'status' ) ) {
							model.set( 'status', 'inherit' );
							changed.push( model.save() );
							removed.push( model );
						} else if ( mediaTrash ) {
							model.set( 'status', 'trash' );
							changed.push( model.save() );
							removed.push( model );
						} else {
							model.destroy({wait: true});
						}
					} );

					if ( changed.length ) {
						selection.remove( removed );

						$.when.apply( null, changed ).then( _.bind( function() {
							library._requery( true );
							this.controller.trigger( 'selection:action:done' );
						}, this ) );
					} else {
						this.controller.trigger( 'selection:action:done' );
					}
				}
			}).render() );

			if ( mediaTrash ) {
				this.toolbar.set( 'deleteSelectedPermanentlyButton', new wp.media.view.DeleteSelectedPermanentlyButton({
					filters: Filters,
					style: 'primary',
					disabled: true,
					text: l10n.deleteSelected,
					controller: this.controller,
					priority: -55,
					click: function() {
						var removed = [], selection = this.controller.state().get( 'selection' );

						if ( ! selection.length || ! window.confirm( l10n.warnBulkDelete ) ) {
							return;
						}

						selection.each( function( model ) {
							if ( ! model.get( 'nonces' )['delete'] ) {
								removed.push( model );
								return;
							}

							model.destroy();
						} );

						selection.remove( removed );
						this.controller.trigger( 'selection:action:done' );
					}
				}).render() );
			}

		} else if ( this.options.date ) {
			// DateFilter is a <select>, screen reader text needs to be rendered before
			this.toolbar.set( 'dateFilterLabel', new wp.media.view.Label({
				value: l10n.filterByDate,
				attributes: {
					'for': 'media-attachment-date-filters'
				},
				priority: -75
			}).render() );
			this.toolbar.set( 'dateFilter', new wp.media.view.DateFilter({
				controller: this.controller,
				model:      this.collection.props,
				priority: -75
			}).render() );
		}

		if ( this.options.search ) {
			// Search is an input, screen reader text needs to be rendered before
			this.toolbar.set( 'searchLabel', new wp.media.view.Label({
				value: l10n.searchMediaLabel,
				attributes: {
					'for': 'media-search-input'
				},
				priority:   60
			}).render() );
			this.toolbar.set( 'search', new wp.media.view.Search({
				controller: this.controller,
				model:      this.collection.props,
				priority:   60
			}).render() );
		}

		if ( this.options.dragInfo ) {
			this.toolbar.set( 'dragInfo', new View({
				el: $( '<div class="instructions">' + l10n.dragInfo + '</div>' )[0],
				priority: -40
			}) );
		}

		if ( this.options.suggestedWidth && this.options.suggestedHeight ) {
			this.toolbar.set( 'suggestedDimensions', new View({
				el: $( '<div class="instructions">' + l10n.suggestedDimensions + ' ' + this.options.suggestedWidth + ' &times; ' + this.options.suggestedHeight + '</div>' )[0],
				priority: -40
			}) );
		}
	},

	updateContent: function() {
		var view = this,
			noItemsView;

		if ( this.controller.isModeActive( 'grid' ) ) {
			noItemsView = view.attachmentsNoResults;
		} else {
			noItemsView = view.uploader;
		}

		if ( ! this.collection.length ) {
			this.toolbar.get( 'spinner' ).show();
			this.dfd = this.collection.more().done( function() {
				if ( ! view.collection.length ) {
					noItemsView.$el.removeClass( 'hidden' );
				} else {
					noItemsView.$el.addClass( 'hidden' );
				}
				view.toolbar.get( 'spinner' ).hide();
			} );
		} else {
			noItemsView.$el.addClass( 'hidden' );
			view.toolbar.get( 'spinner' ).hide();
		}
	},

	createUploader: function() {
		this.uploader = new wp.media.view.UploaderInline({
			controller: this.controller,
			status:     false,
			message:    this.controller.isModeActive( 'grid' ) ? '' : l10n.noItemsFound,
			canClose:   this.controller.isModeActive( 'grid' )
		});

		this.uploader.hide();
		this.views.add( this.uploader );
	},

	toggleUploader: function() {
		if ( this.uploader.$el.hasClass( 'hidden' ) ) {
			this.uploader.show();
		} else {
			this.uploader.hide();
		}
	},

	createAttachments: function() {
		this.attachments = new wp.media.view.Attachments({
			controller:           this.controller,
			collection:           this.collection,
			selection:            this.options.selection,
			model:                this.model,
			sortable:             this.options.sortable,
			scrollElement:        this.options.scrollElement,
			idealColumnWidth:     this.options.idealColumnWidth,

			// The single `Attachment` view to be used in the `Attachments` view.
			AttachmentView: this.options.AttachmentView
		});

		// Add keydown listener to the instance of the Attachments view
		this.controller.on( 'attachment:keydown:arrow',     _.bind( this.attachments.arrowEvent, this.attachments ) );
		this.controller.on( 'attachment:details:shift-tab', _.bind( this.attachments.restoreFocus, this.attachments ) );

		this.views.add( this.attachments );


		if ( this.controller.isModeActive( 'grid' ) ) {
			this.attachmentsNoResults = new View({
				controller: this.controller,
				tagName: 'p'
			});

			this.attachmentsNoResults.$el.addClass( 'hidden no-media' );
			this.attachmentsNoResults.$el.html( l10n.noMedia );

			this.views.add( this.attachmentsNoResults );
		}
	},

	createSidebar: function() {
		var options = this.options,
			selection = options.selection,
			sidebar = this.sidebar = new wp.media.view.Sidebar({
				controller: this.controller
			});

		this.views.add( sidebar );

		if ( this.controller.uploader ) {
			sidebar.set( 'uploads', new wp.media.view.UploaderStatus({
				controller: this.controller,
				priority:   40
			}) );
		}

		selection.on( 'selection:single', this.createSingle, this );
		selection.on( 'selection:unsingle', this.disposeSingle, this );

		if ( selection.single() ) {
			this.createSingle();
		}
	},

	createSingle: function() {
		var sidebar = this.sidebar,
			single = this.options.selection.single();

		sidebar.set( 'details', new wp.media.view.Attachment.Details({
			controller: this.controller,
			model:      single,
			priority:   80
		}) );

		sidebar.set( 'compat', new wp.media.view.AttachmentCompat({
			controller: this.controller,
			model:      single,
			priority:   120
		}) );

		if ( this.options.display ) {
			sidebar.set( 'display', new wp.media.view.Settings.AttachmentDisplay({
				controller:   this.controller,
				model:        this.model.display( single ),
				attachment:   single,
				priority:     160,
				userSettings: this.model.get('displayUserSettings')
			}) );
		}

		// Show the sidebar on mobile
		if ( this.model.id === 'insert' ) {
			sidebar.$el.addClass( 'visible' );
		}
	},

	disposeSingle: function() {
		var sidebar = this.sidebar;
		sidebar.unset('details');
		sidebar.unset('compat');
		sidebar.unset('display');
		// Hide the sidebar on mobile
		sidebar.$el.removeClass( 'visible' );
	}
});

module.exports = AttachmentsBrowser;
