text: /**
   * @output wp-admin/js/widgets/custom-html-widgets.js
   */
  
  /* global wp */
  /* eslint consistent-this: [ "error", "control" ] */
  /* eslint no-magic-numbers: ["error", { "ignore": [0,1,-1] }] */
  
  /**
   * @namespace wp.customHtmlWidget
   * @memberOf wp
   */
  wp.customHtmlWidgets = ( function( $ ) {
  	'use strict';
  
  	var component = {
  		idBases: [ 'custom_html' ],
  		codeEditorSettings: {},
  		l10n: {
  			errorNotice: {
  				singular: '',
  				plural: ''
  			}
  		}
  	};
  
  	component.CustomHtmlWidgetControl = Backbone.View.extend(/** @lends wp.customHtmlWidgets.CustomHtmlWidgetControl.prototype */{
  
  		/**
  		 * View events.
  		 *
  		 * @type {Object}
  		 */
  		events: {},
  
  		/**
  		 * Text widget control.
  		 *
  		 * @constructs wp.customHtmlWidgets.CustomHtmlWidgetControl
  		 * @augments Backbone.View
  		 * @abstract
  		 *
  		 * @param {Object} options - Options.
  		 * @param {jQuery} options.el - Control field container element.
  		 * @param {jQuery} options.syncContainer - Container element where fields are synced for the server.
  		 *
  		 * @returns {void}
  		 */
  		initialize: function initialize( options ) {
  			var control = this;
  
  			if ( ! options.el ) {
  				throw new Error( 'Missing options.el' );
  			}
  			if ( ! options.syncContainer ) {
  				throw new Error( 'Missing options.syncContainer' );
  			}
  
  			Backbone.View.prototype.initialize.call( control, options );
  			control.syncContainer = options.syncContainer;
  			control.widgetIdBase = control.syncContainer.parent().find( '.id_base' ).val();
  			control.widgetNumber = control.syncContainer.parent().find( '.widget_number' ).val();
  			control.customizeSettingId = 'widget_' + control.widgetIdBase + '[' + String( control.widgetNumber ) + ']';
  
  			control.$el.addClass( 'custom-html-widget-fields' );
  			control.$el.html( wp.template( 'widget-custom-html-control-fields' )( { codeEditorDisabled: component.codeEditorSettings.disabled } ) );
  
  			control.errorNoticeContainer = control.$el.find( '.code-editor-error-container' );
  			control.currentErrorAnnotations = [];
  			control.saveButton = control.syncContainer.add( control.syncContainer.parent().find( '.widget-control-actions' ) ).find( '.widget-control-save, #savewidget' );
  			control.saveButton.addClass( 'custom-html-widget-save-button' ); // To facilitate style targeting.
  
  			control.fields = {
  				title: control.$el.find( '.title' ),
  				content: control.$el.find( '.content' )
  			};
  
  			// Sync input fields to hidden sync fields which actually get sent to the server.
  			_.each( control.fields, function( fieldInput, fieldName ) {
  				fieldInput.on( 'input change', function updateSyncField() {
  					var syncInput = control.syncContainer.find( '.sync-input.' + fieldName );
  					if ( syncInput.val() !== fieldInput.val() ) {
  						syncInput.val( fieldInput.val() );
  						syncInput.trigger( 'change' );
  					}
  				});
  
  				// Note that syncInput cannot be re-used because it will be destroyed with each widget-updated event.
  				fieldInput.val( control.syncContainer.find( '.sync-input.' + fieldName ).val() );
  			});
  		},
  
  		/**
  		 * Update input fields from the sync fields.
  		 *
  		 * This function is called at the widget-updated and widget-synced events.
  		 * A field will only be updated if it is not currently focused, to avoid
  		 * overwriting content that the user is entering.
  		 *
  		 * @returns {void}
  		 */
  		updateFields: function updateFields() {
  			var control = this, syncInput;
  
  			if ( ! control.fields.title.is( document.activeElement ) ) {
  				syncInput = control.syncContainer.find( '.sync-input.title' );
  				control.fields.title.val( syncInput.val() );
  			}
  
  			/*
  			 * Prevent updating content when the editor is focused or if there are current error annotations,
  			 * to prevent the editor's contents from getting sanitized as soon as a user removes focus from
  			 * the editor. This is particularly important for users who cannot unfiltered_html.
  			 */
  			control.contentUpdateBypassed = control.fields.content.is( document.activeElement ) || control.editor && control.editor.codemirror.state.focused || 0 !== control.currentErrorAnnotations.length;
  			if ( ! control.contentUpdateBypassed ) {
  				syncInput = control.syncContainer.find( '.sync-input.content' );
  				control.fields.content.val( syncInput.val() );
  			}
  		},
  
  		/**
  		 * Show linting error notice.
  		 *
  		 * @param {Array} errorAnnotations - Error annotations.
  		 * @returns {void}
  		 */
  		updateErrorNotice: function( errorAnnotations ) {
  			var control = this, errorNotice, message = '', customizeSetting;
  
  			if ( 1 === errorAnnotations.length ) {
  				message = component.l10n.errorNotice.singular.replace( '%d', '1' );
  			} else if ( errorAnnotations.length > 1 ) {
  				message = component.l10n.errorNotice.plural.replace( '%d', String( errorAnnotations.length ) );
  			}
  
  			if ( control.fields.content[0].setCustomValidity ) {
  				control.fields.content[0].setCustomValidity( message );
  			}
  
  			if ( wp.customize && wp.customize.has( control.customizeSettingId ) ) {
  				customizeSetting = wp.customize( control.customizeSettingId );
  				customizeSetting.notifications.remove( 'htmlhint_error' );
  				if ( 0 !== errorAnnotations.length ) {
  					customizeSetting.notifications.add( 'htmlhint_error', new wp.customize.Notification( 'htmlhint_error', {
  						message: message,
  						type: 'error'
  					} ) );
  				}
  			} else if ( 0 !== errorAnnotations.length ) {
  				errorNotice = $( '<div class="inline notice notice-error notice-alt"></div>' );
  				errorNotice.append( $( '<p></p>', {
  					text: message
  				} ) );
  				control.errorNoticeContainer.empty();
  				control.errorNoticeContainer.append( errorNotice );
  				control.errorNoticeContainer.slideDown( 'fast' );
  				wp.a11y.speak( message );
  			} else {
  				control.errorNoticeContainer.slideUp( 'fast' );
  			}
  		},
  
  		/**
  		 * Initialize editor.
  		 *
  		 * @returns {void}
  		 */
  		initializeEditor: function initializeEditor() {
  			var control = this, settings;
  
  			if ( component.codeEditorSettings.disabled ) {
  				return;
  			}
  
  			settings = _.extend( {}, component.codeEditorSettings, {
  
  				/**
  				 * Handle tabbing to the field before the editor.
  				 *
  				 * @ignore
  				 *
  				 * @returns {void}
  				 */
  				onTabPrevious: function onTabPrevious() {
  					control.fields.title.focus();
  				},
  
  				/**
  				 * Handle tabbing to the field after the editor.
  				 *
  				 * @ignore
  				 *
  				 * @returns {void}
  				 */
  				onTabNext: function onTabNext() {
  					var tabbables = control.syncContainer.add( control.syncContainer.parent().find( '.widget-position, .widget-control-actions' ) ).find( ':tabbable' );
  					tabbables.first().focus();
  				},
  
  				/**
  				 * Disable save button and store linting errors for use in updateFields.
  				 *
  				 * @ignore
  				 *
  				 * @param {Array} errorAnnotations - Error notifications.
  				 * @returns {void}
  				 */
  				onChangeLintingErrors: function onChangeLintingErrors( errorAnnotations ) {
  					control.currentErrorAnnotations = errorAnnotations;
  				},
  
  				/**
  				 * Update error notice.
  				 *
  				 * @ignore
  				 *
  				 * @param {Array} errorAnnotations - Error annotations.
  				 * @returns {void}
  				 */
  				onUpdateErrorNotice: function onUpdateErrorNotice( errorAnnotations ) {
  					control.saveButton.toggleClass( 'validation-blocked disabled', errorAnnotations.length > 0 );
  					control.updateErrorNotice( errorAnnotations );
  				}
  			});
  
  			control.editor = wp.codeEditor.initialize( control.fields.content, settings );
  
  			// Improve the editor accessibility.
  			$( control.editor.codemirror.display.lineDiv )
  				.attr({
  					role: 'textbox',
  					'aria-multiline': 'true',
  					'aria-labelledby': control.fields.content[0].id + '-label',
  					'aria-describedby': 'editor-keyboard-trap-help-1 editor-keyboard-trap-help-2 editor-keyboard-trap-help-3 editor-keyboard-trap-help-4'
  				});
  
  			// Focus the editor when clicking on its label.
  			$( '#' + control.fields.content[0].id + '-label' ).on( 'click', function() {
  				control.editor.codemirror.focus();
  			});
  
  			control.fields.content.on( 'change', function() {
  				if ( this.value !== control.editor.codemirror.getValue() ) {
  					control.editor.codemirror.setValue( this.value );
  				}
  			});
  			control.editor.codemirror.on( 'change', function() {
  				var value = control.editor.codemirror.getValue();
  				if ( value !== control.fields.content.val() ) {
  					control.fields.content.val( value ).trigger( 'change' );
  				}
  			});
  
  			// Make sure the editor gets updated if the content was updated on the server (sanitization) but not updated in the editor since it was focused.
  			control.editor.codemirror.on( 'blur', function() {
  				if ( control.contentUpdateBypassed ) {
  					control.syncContainer.find( '.sync-input.content' ).trigger( 'change' );
  				}
  			});
  
  			// Prevent hitting Esc from collapsing the widget control.
  			if ( wp.customize ) {
  				control.editor.codemirror.on( 'keydown', function onKeydown( codemirror, event ) {
  					var escKeyCode = 27;
  					if ( escKeyCode === event.keyCode ) {
  						event.stopPropagation();
  					}
  				});
  			}
  		}
  	});
  
  	/**
  	 * Mapping of widget ID to instances of CustomHtmlWidgetControl subclasses.
  	 *
  	 * @alias wp.customHtmlWidgets.widgetControls
  	 *
  	 * @type {Object.<string, wp.textWidgets.CustomHtmlWidgetControl>}
  	 */
  	component.widgetControls = {};
  
  	/**
  	 * Handle widget being added or initialized for the first time at the widget-added event.
  	 *
  	 * @alias wp.customHtmlWidgets.handleWidgetAdded
  	 *
  	 * @param {jQuery.Event} event - Event.
  	 * @param {jQuery}       widgetContainer - Widget container element.
  	 *
  	 * @returns {void}
  	 */
  	component.handleWidgetAdded = function handleWidgetAdded( event, widgetContainer ) {
  		var widgetForm, idBase, widgetControl, widgetId, animatedCheckDelay = 50, renderWhenAnimationDone, fieldContainer, syncContainer;
  		widgetForm = widgetContainer.find( '> .widget-inside > .form, > .widget-inside > form' ); // Note: '.form' appears in the customizer, whereas 'form' on the widgets admin screen.
  
  		idBase = widgetForm.find( '> .id_base' ).val();
  		if ( -1 === component.idBases.indexOf( idBase ) ) {
  			return;
  		}
  
  		// Prevent initializing already-added widgets.
  		widgetId = widgetForm.find( '.widget-id' ).val();
  		if ( component.widgetControls[ widgetId ] ) {
  			return;
  		}
  
  		/*
  		 * Create a container element for the widget control fields.
  		 * This is inserted into the DOM immediately before the the .widget-content
  		 * element because the contents of this element are essentially "managed"
  		 * by PHP, where each widget update cause the entire element to be emptied
  		 * and replaced with the rendered output of WP_Widget::form() which is
  		 * sent back in Ajax request made to save/update the widget instance.
  		 * To prevent a "flash of replaced DOM elements and re-initialized JS
  		 * components", the JS template is rendered outside of the normal form
  		 * container.
  		 */
  		fieldContainer = $( '<div></div>' );
  		syncContainer = widgetContainer.find( '.widget-content:first' );
  		syncContainer.before( fieldContainer );
  
  		widgetControl = new component.CustomHtmlWidgetControl({
  			el: fieldContainer,
  			syncContainer: syncContainer
  		});
  
  		component.widgetControls[ widgetId ] = widgetControl;
  
  		/*
  		 * Render the widget once the widget parent's container finishes animating,
  		 * as the widget-added event fires with a slideDown of the container.
  		 * This ensures that the textarea is visible and the editor can be initialized.
  		 */
  		renderWhenAnimationDone = function() {
  			if ( ! ( wp.customize ? widgetContainer.parent().hasClass( 'expanded' ) : widgetContainer.hasClass( 'open' ) ) ) { // Core merge: The wp.customize condition can be eliminated with this change being in core: https://github.com/xwp/wordpress-develop/pull/247/commits/5322387d
  				setTimeout( renderWhenAnimationDone, animatedCheckDelay );
  			} else {
  				widgetControl.initializeEditor();
  			}
  		};
  		renderWhenAnimationDone();
  	};
  
  	/**
  	 * Setup widget in accessibility mode.
  	 *
  	 * @alias wp.customHtmlWidgets.setupAccessibleMode
  	 *
  	 * @returns {void}
  	 */
  	component.setupAccessibleMode = function setupAccessibleMode() {
  		var widgetForm, idBase, widgetControl, fieldContainer, syncContainer;
  		widgetForm = $( '.editwidget > form' );
  		if ( 0 === widgetForm.length ) {
  			return;
  		}
  
  		idBase = widgetForm.find( '> .widget-control-actions > .id_base' ).val();
  		if ( -1 === component.idBases.indexOf( idBase ) ) {
  			return;
  		}
  
  		fieldContainer = $( '<div></div>' );
  		syncContainer = widgetForm.find( '> .widget-inside' );
  		syncContainer.before( fieldContainer );
  
  		widgetControl = new component.CustomHtmlWidgetControl({
  			el: fieldContainer,
  			syncContainer: syncContainer
  		});
  
  		widgetControl.initializeEditor();
  	};
  
  	/**
  	 * Sync widget instance data sanitized from server back onto widget model.
  	 *
  	 * This gets called via the 'widget-updated' event when saving a widget from
  	 * the widgets admin screen and also via the 'widget-synced' event when making
  	 * a change to a widget in the customizer.
  	 *
  	 * @alias wp.customHtmlWidgets.handleWidgetUpdated
  	 *
  	 * @param {jQuery.Event} event - Event.
  	 * @param {jQuery}       widgetContainer - Widget container element.
  	 * @returns {void}
  	 */
  	component.handleWidgetUpdated = function handleWidgetUpdated( event, widgetContainer ) {
  		var widgetForm, widgetId, widgetControl, idBase;
  		widgetForm = widgetContainer.find( '> .widget-inside > .form, > .widget-inside > form' );
  
  		idBase = widgetForm.find( '> .id_base' ).val();
  		if ( -1 === component.idBases.indexOf( idBase ) ) {
  			return;
  		}
  
  		widgetId = widgetForm.find( '> .widget-id' ).val();
  		widgetControl = component.widgetControls[ widgetId ];
  		if ( ! widgetControl ) {
  			return;
  		}
  
  		widgetControl.updateFields();
  	};
  
  	/**
  	 * Initialize functionality.
  	 *
  	 * This function exists to prevent the JS file from having to boot itself.
  	 * When WordPress enqueues this script, it should have an inline script
  	 * attached which calls wp.textWidgets.init().
  	 *
  	 * @alias wp.customHtmlWidgets.init
  	 *
  	 * @param {object} settings - Options for code editor, exported from PHP.
  	 *
  	 * @returns {void}
  	 */
  	component.init = function init( settings ) {
  		var $document = $( document );
  		_.extend( component.codeEditorSettings, settings );
  
  		$document.on( 'widget-added', component.handleWidgetAdded );
  		$document.on( 'widget-synced widget-updated', component.handleWidgetUpdated );
  
  		/*
  		 * Manually trigger widget-added events for media widgets on the admin
  		 * screen once they are expanded. The widget-added event is not triggered
  		 * for each pre-existing widget on the widgets admin screen like it is
  		 * on the customizer. Likewise, the customizer only triggers widget-added
  		 * when the widget is expanded to just-in-time construct the widget form
  		 * when it is actually going to be displayed. So the following implements
  		 * the same for the widgets admin screen, to invoke the widget-added
  		 * handler when a pre-existing media widget is expanded.
  		 */
  		$( function initializeExistingWidgetContainers() {
  			var widgetContainers;
  			if ( 'widgets' !== window.pagenow ) {
  				return;
  			}
  			widgetContainers = $( '.widgets-holder-wrap:not(#available-widgets)' ).find( 'div.widget' );
  			widgetContainers.one( 'click.toggle-widget-expanded', function toggleWidgetExpanded() {
  				var widgetContainer = $( this );
  				component.handleWidgetAdded( new jQuery.Event( 'widget-added' ), widgetContainer );
  			});
  
  			// Accessibility mode.
  			$( window ).on( 'load', function() {
  				component.setupAccessibleMode();
  			});
  		});
  	};
  
  	return component;
  })( jQuery );
  