window.rwmb = window.rwmb || {};

jQuery( function ( $ ) {
	'use strict';

	var views = rwmb.views = rwmb.views || {},
		models = rwmb.models = rwmb.models || {},
		Controller, MediaField, MediaList, MediaItem, MediaButton, MediaStatus;

	/***
	 * Controller Model
	 * Manages data of media field and media models.  Most of the media views will use this to manage the media
	 */
	Controller = models.Controller = Backbone.Model.extend( {
		//Default options
		defaults: {
			maxFiles: 0,
			ids: [],
			mimeType: '',
			forceDelete: false,
			showStatus: true,
			length: 0
		},

		//Initialize Controller model
		initialize: function ( options ) {
			var that = this;
			// All numbers, no 0 ids
			this.set( 'ids', _.without( _.map( this.get( 'ids' ), Number ), 0, - 1 ) );

			// Create items collection
			this.set( 'items', new wp.media.model.Attachments() );

			this.listenTo( this.get( 'items' ), 'add remove reset', function () {
				var items = this.get( 'items' ),
					length = items.length,
					max = this.get( 'maxFiles' );

				this.set( 'length', length );
				this.set( 'full', max > 0 && length >= max );
			} );

			// Listen for destroy event on controller, delete all models when triggered
			this.on( 'destroy', function ( e ) {
				if ( this.get( 'forceDelete' ) ) {
					this.get( 'items' ).each( function ( item ) {
						item.destroy();
					} );
				}
			} );
		},


		// Method to load media
		load: function () {
			var that = this;
			// Load initial media
			if ( ! _.isEmpty( this.get( 'ids' ) ) ) {
				this.get( 'items' ).props.set( {
					query: true,
					include: this.get( 'ids' ),
					orderby: 'post__in',
					order: 'ASC',
					type: this.get( 'mimeType' ),
					perPage: this.get( 'maxFiles' ) || - 1
				} );
				// Get more then trigger ready
				this.get( 'items' ).more();
			}
		},

		// Method to remove media items
		removeItem: function ( item ) {
			this.get( 'items' ).remove( item );
			if ( this.get( 'forceDelete' ) ) {
				item.destroy();
			}
		},

		// Method to add items
		addItems: function ( items ) {
			if ( this.get( 'maxFiles' ) ) {
				var left = this.get( 'maxFiles' ) - this.get( 'items' ).length;
				if ( left <= 0 ) {
					return this;
				}

				items = _.difference( items, this.get( 'items' ).models );
				items = _.first( items, left );
			}
			this.get( 'items' ).add( items );
		}
	} );

	/***
	 * MediaField
	 * Sets up media field view and subviews
	 */
	MediaField = views.MediaField = Backbone.View.extend( {
		initialize: function ( options ) {
			var that = this;
			this.$input = $( options.input );
			this.controller = new Controller( _.extend(
				{
					fieldName: this.$input.attr( 'name' ),
					ids: this.$input.val().split( ',' )
				},
				this.$el.data()
			) );

			// Create views
			this.createList();
			this.createAddButton();
			this.createStatus();

			// Render
			this.render();

			// Load media
			this.controller.load();

			// Listen for destroy event on input
			this.$input.on( 'remove', function () {
				this.controller.destroy();
			} );

			this.controller.on( 'change:length', function ( e ) {
				that.$input.trigger( 'change' );
			} );
		},

		// Creates media list
		createList: function () {
			this.list = new MediaList( {controller: this.controller} );
		},

		// Creates button that adds media
		createAddButton: function () {
			this.addButton = new MediaButton( {controller: this.controller} );
		},

		// Creates status
		createStatus: function () {
			this.status = new MediaStatus( {controller: this.controller} );
		},

		// Render field and adds sub fields
		render: function () {
			// Empty then add parts
			this.$el.empty().append(
				this.list.el,
				this.addButton.el,
				this.status.el
			);
		}
	} );

	/***
	 * Media List
	 * lists media
	 */
	MediaList = views.MediaList = Backbone.View.extend( {
		tagName: 'ul',
		className: 'rwmb-media-list',

		//Add item view
		addItemView: function ( item ) {
			var view = this._views[item.cid] = new this.itemView( {
				model: item,
				controller: this.controller
			} );

			this.$el.append( view.el );
		},

		//Remove item view
		removeItemView: function ( item ) {
			if ( this._views[item.cid] ) {
				this._views[item.cid].remove();
				delete this._views[item.cid];
			}
		},

		initialize: function ( options ) {
			this._views = {};
			this.controller = options.controller;
			this.itemView = options.itemView || MediaItem;

			this.setEvents();

			// Sort media using sortable
			this.initSortable();
		},

		setEvents: function () {
			this.listenTo( this.controller.get( 'items' ), 'add', this.addItemView );
			this.listenTo( this.controller.get( 'items' ), 'remove', this.removeItemView );
		},

		initSortable: function () {
			var collection = this.controller.get( 'items' );
			this.$el.sortable( {
				// Change the position of the attachment as soon as the
				// mouse pointer overlaps a thumbnail.
				tolerance: 'pointer',

				// Record the initial `index` of the dragged model.
				start: function ( event, ui ) {
					ui.item.data( 'sortableIndexStart', ui.item.index() );
				},

				// Update the model's index in the collection.
				// Do so silently, as the view is already accurate.
				update: function ( event, ui ) {
					var model = collection.at( ui.item.data( 'sortableIndexStart' ) );

					// Silently shift the model to its new index.
					collection.remove( model, {
						silent: true
					} );
					collection.add( model, {
						silent: true,
						at: ui.item.index()
					} );

					// Fire the `reset` event to ensure other collections sync.
					collection.trigger( 'reset', collection );
				}
			} );
		}
	} );

	/***
	 * MediaStatus
	 * Tracks status of media field if maxStatus is greater than 0
	 */
	MediaStatus = views.MediaStatus = Backbone.View.extend( {
		tagName: 'span',
		className: 'rwmb-media-status',
		template: wp.template( 'rwmb-media-status' ),

		//Initialize
		initialize: function ( options ) {
			this.controller = options.controller;

			//Auto hide if showStatus is false
			if ( ! this.controller.get( 'showStatus' ) ) {
				this.$el.hide();
			}

			//Rerender if changes happen in controller
			this.listenTo( this.controller, 'change:length', this.render );

			//Render
			this.render();
		},

		render: function () {
			var attrs = _.clone( this.controller.attributes );
			this.$el.html( this.template( attrs ) );
		}
	} );

	/***
	 * Media Button
	 * Selects and adds ,edia to controller
	 */
	MediaButton = views.MediaButton = Backbone.View.extend( {
		className: 'rwmb-add-media button',
		tagName: 'a',
		events: {
			click: function () {
				// Destroy the previous collection frame.
				if ( this._frame ) {
					//this.stopListening( this._frame );
					this._frame.dispose();
				}

				this._frame = wp.media( {
					className: 'media-frame rwmb-media-frame',
					multiple: true,
					title: i18nRwmbMedia.select,
					editing: true,
					library: {
						type: this.controller.get( 'mimeType' )
					}
				} );

				this._frame.on( 'select', function () {
					var selection = this._frame.state().get( 'selection' );
					this.controller.addItems( selection.models );
				}, this );

				this._frame.open();
			}
		},
		render: function () {
			this.$el.text( i18nRwmbMedia.add );
			return this;
		},

		initialize: function ( options ) {
			this.controller = options.controller;

			// Auto hide if you reach the max number of media
			this.listenTo( this.controller, 'change:full', function () {
				this.$el.toggle( ! this.controller.get( 'full' ) );
			} );

			this.render();
		}
	} );

	/***
	 * MediaItem
	 * View for individual media items
	 */
	MediaItem = views.MediaItem = Backbone.View.extend( {
		tagName: 'li',
		className: 'rwmb-media-item',
		template: wp.template( 'rwmb-media-item' ),
		initialize: function ( options ) {
			this.controller = options.controller;
			this.render();
			this.listenTo( this.model, 'change', function () {
				this.render();
			} );

			this.$el.data( 'id', this.model.cid );
		},


		events: {
			// Event when remove button clicked
			'click .rwmb-remove-media': function ( e ) {
				this.controller.removeItem( this.model );
				return false;
			},

			'click .rwmb-edit-media': function ( e ) {
				// Destroy the previous collection frame.
				if ( this._frame ) {
					//this.stopListening( this._frame );
					this._frame.dispose();
				}

				// Trigger the media frame to open the correct item
				this._frame = wp.media( {
					frame: 'edit-attachments',
					controller: {
						// Needed to trick Edit modal to think there is a gridRouter
						gridRouter: {
							navigate: function ( destination ) {
							},
							baseUrl: function ( url ) {
							}
						}
					},
					library: this.controller.get( 'items' ),
					model: this.model
				} );

				this._frame.open();

				return false;
			}
		},

		render: function () {
			var attrs = _.clone( this.model.attributes );
			attrs.fieldName = this.controller.get( 'fieldName' );
			this.$el.html( this.template( attrs ) );
			return this;
		}
	} );

	/**
	 * Initialize media fields
	 * @return void
	 */
	function initMediaField() {
		new MediaField( {input: this, el: $( this ).siblings( 'div.rwmb-media-view' )} );
	}


	$( ':input.rwmb-file_advanced' ).each( initMediaField );
	$( '.rwmb-input' )
		.on( 'clone', ':input.rwmb-file_advanced', initMediaField );
} );