/* eslint consistent-this: [ "error", "control" ] */

(function( component, $ ) {

	'use strict';

	var ImageWidgetModel, ImageWidgetControl;

	/**

	 * Image widget model.

	 *

	 * See WP_Widget_Media_Image::enqueue_admin_scripts() for amending prototype from PHP exports.

	 *

	 * @class ImageWidgetModel

	 * @constructor

	 */

	ImageWidgetModel = component.MediaWidgetModel.extend({});

	/**

	 * Image widget control.

	 *

	 * See WP_Widget_Media_Image::enqueue_admin_scripts() for amending prototype from PHP exports.

	 *

	 * @class ImageWidgetModel

	 * @constructor

	 */

	ImageWidgetControl = component.MediaWidgetControl.extend({

		/**

		 * View events.

		 *

		 * @type {object}

		 */

		events: _.extend( {}, component.MediaWidgetControl.prototype.events, {

			'click .media-widget-preview.populated': 'editMedia'

		} ),

		/**

		 * Render preview.

		 *

		 * @returns {void}

		 */

		renderPreview: function renderPreview() {

			var control = this, previewContainer, previewTemplate, fieldsContainer, fieldsTemplate, linkInput;

			if ( ! control.model.get( 'attachment_id' ) && ! control.model.get( 'url' ) ) {

				return;

			}

			previewContainer = control.$el.find( '.media-widget-preview' );

			previewTemplate = wp.template( 'wp-media-widget-image-preview' );

			previewContainer.html( previewTemplate( control.previewTemplateProps.toJSON() ) );

			previewContainer.addClass( 'populated' );

			linkInput = control.$el.find( '.link' );

			if ( ! linkInput.is( document.activeElement ) ) {

				fieldsContainer = control.$el.find( '.media-widget-fields' );

				fieldsTemplate = wp.template( 'wp-media-widget-image-fields' );

				fieldsContainer.html( fieldsTemplate( control.previewTemplateProps.toJSON() ) );

			}

		},

		/**

		 * Open the media image-edit frame to modify the selected item.

		 *

		 * @returns {void}

		 */

		editMedia: function editMedia() {

			var control = this, mediaFrame, updateCallback, defaultSync, metadata;

			metadata = control.mapModelToMediaFrameProps( control.model.toJSON() );

			// Needed or else none will not be selected if linkUrl is not also empty.

			if ( 'none' === metadata.link ) {

				metadata.linkUrl = '';

			}

			// Set up the media frame.

			mediaFrame = wp.media({

				frame: 'image',

				state: 'image-details',

				metadata: metadata

			});

			mediaFrame.$el.addClass( 'media-widget' );

			updateCallback = function() {

				var mediaProps, linkType;

				// Update cached attachment object to avoid having to re-fetch. This also triggers re-rendering of preview.

				mediaProps = mediaFrame.state().attributes.image.toJSON();

				linkType = mediaProps.link;

				mediaProps.link = mediaProps.linkUrl;

				control.selectedAttachment.set( mediaProps );

				control.displaySettings.set( 'link', linkType );

				control.model.set( _.extend(

					control.mapMediaToModelProps( mediaProps ),

					{ error: false }

				) );

			};

			mediaFrame.state( 'image-details' ).on( 'update', updateCallback );

			mediaFrame.state( 'replace-image' ).on( 'replace', updateCallback );

			// Disable syncing of attachment changes back to server. See <https://core.trac.wordpress.org/ticket/40403>.

			defaultSync = wp.media.model.Attachment.prototype.sync;

			wp.media.model.Attachment.prototype.sync = function rejectedSync() {

				return $.Deferred().rejectWith( this ).promise();

			};

			mediaFrame.on( 'close', function onClose() {

				mediaFrame.detach();

				wp.media.model.Attachment.prototype.sync = defaultSync;

			});

			mediaFrame.open();

		},

		/**

		 * Get props which are merged on top of the model when an embed is chosen (as opposed to an attachment).

		 *

		 * @returns {Object} Reset/override props.

		 */

		getEmbedResetProps: function getEmbedResetProps() {

			return _.extend(

				component.MediaWidgetControl.prototype.getEmbedResetProps.call( this ),

				{

					size: 'full',

					width: 0,

					height: 0

				}

			);

		},

		/**

		 * Get the instance props from the media selection frame.

		 *

		 * Prevent the image_title attribute from being initially set when adding an image from the media library.

		 *

		 * @param {wp.media.view.MediaFrame.Select} mediaFrame - Select frame.

		 * @returns {Object} Props.

		 */

		getModelPropsFromMediaFrame: function getModelPropsFromMediaFrame( mediaFrame ) {

			var control = this;

			return _.omit(

				component.MediaWidgetControl.prototype.getModelPropsFromMediaFrame.call( control, mediaFrame ),

				'image_title'

			);

		},

		/**

		 * Map model props to preview template props.

		 *

		 * @returns {Object} Preview template props.

		 */

		mapModelToPreviewTemplateProps: function mapModelToPreviewTemplateProps() {

			var control = this, previewTemplateProps, url;

			url = control.model.get( 'url' );

			previewTemplateProps = component.MediaWidgetControl.prototype.mapModelToPreviewTemplateProps.call( control );

			previewTemplateProps.currentFilename = url ? url.replace( /\?.*$/, '' ).replace( /^.+\//, '' ) : '';

			previewTemplateProps.link_url = control.model.get( 'link_url' );

			return previewTemplateProps;

		}

	});

	// Exports.

	component.controlConstructors.media_image = ImageWidgetControl;

	component.modelConstructors.media_image = ImageWidgetModel;

})( wp.mediaWidgets, jQuery );