/**
 * Registers blocks in the Gutenberg editor.
 *
 * @since   1.9.6.5
 *
 * @package ConvertKit
 * @author ConvertKit
 */

// Register Gutenberg Blocks if the Gutenberg Editor is loaded on screen.
// This prevents JS errors if this script is accidentally enqueued on a non-
// Gutenberg editor screen, or the Classic Editor Plugin is active.
if ( typeof wp !== 'undefined' &&
	typeof wp.blocks !== 'undefined' ) {

	// Register each ConvertKit Block in Gutenberg.
	for ( const block in convertkit_blocks ) {
		convertKitGutenbergRegisterBlock( convertkit_blocks[ block ] );
	}

	// Register ConvertKit Pre-publish actions in Gutenberg.
	if ( typeof convertkit_pre_publish_actions !== 'undefined' ) {
		convertKitGutenbergRegisterPrePublishActions( convertkit_pre_publish_actions );
	}

}

/**
 * Registers the given block in Gutenberg.
 *
 * @since 	1.9.6.5
 *
 * @param 	object 	block 	Block
 */
function convertKitGutenbergRegisterBlock( block ) {

	( function ( blocks, editor, element, components ) {

		// Define some constants for the various items we'll use.
		const el                    = element.createElement;
		const { registerBlockType } = blocks;
		const { InspectorControls } = editor;
		const {
			Fragment,
			useState
		}                           = element;
		const {
			Button,
			Dashicon,
			TextControl,
			SelectControl,
			ToggleControl,
			Panel,
			PanelBody,
			PanelRow
		}                           = components;

		/**
		 * Returns the icon to display for this block, depending
		 * on the supplied block's configuration.
		 *
		 * @since   2.2.0
		 *
		 * @return  element|string
		 */
		const getIcon = function () {

			// Return a fallback default icon if none is specified for this block.
			if ( typeof block.gutenberg_icon === 'undefined' ) {
				return 'dashicons-tablet';
			}

			// Return HTML element if the icon is an SVG string.
			if ( block.gutenberg_icon.search( 'svg' ) >= 0 ) {
				return element.RawHTML(
					{
						children: block.gutenberg_icon
					}
				);
			}

			// Just return the string, as it's a dashicon CSS class.
			return block.gutenberg_icon;

		}

		/**
		 * Return a field element for the block sidebar, which is displayed in a panel's row
		 * when this block is being edited.
		 *
		 * @since   2.2.0
		 *
		 * @param   object  props           Block properties.
		 * @param   object  field      		Field attributes.
		 * @param 	string 	attribute 		Attribute name to store the field's data in.
		 * @return  array                   Field element
		 */
		const getField = function ( props, field, attribute ) {

			// Define some field properties shared across all field types.
			let fieldProperties = {
				id:  		'convertkit_' + block.name + '_' + attribute,
				label: 		field.label,
				help: 		field.description,
				value: 		props.attributes[ attribute ],
				onChange: 	function ( value ) {
					if ( field.type === 'number' ) {
						// If value is a blank string i.e. no attribute value was provided,
						// cast it to the field's minimum number setting.
						// This prevents WordPress' block renderer API returning a 400 error
						// because a blank value will be passed as a string, when WordPress
						// expects it to be a numerical value.
						if ( value === '' ) {
							value = field.min;
						}

						// Cast value to integer if a value exists.
						if ( value.length > 0 ) {
							value = Number( value );
						}
					}

					let newValue          = {};
					newValue[ attribute ] = value;
					props.setAttributes( newValue );
				}
			};

			// Define additional Field Properties and the Field Element,
			// depending on the Field Type (select, textarea, text etc).
			switch ( field.type ) {

				case 'select':
					// Build options for <select> input.
					let fieldOptions = [];
					fieldOptions.push(
						{
							label: '(None)',
							value: '',
						}
					);
					for ( let value in field.values ) {
						fieldOptions.push(
							{
								label: field.values[ value ],
								value: value
							}
						);
					}

					// Sort field's options alphabetically by label.
					fieldOptions.sort(
						function ( x, y ) {

							let a = x.label.toUpperCase(),
							b     = y.label.toUpperCase();
							return a.localeCompare( b );

						}
					);

					// Assign options to field.
					fieldProperties.options = fieldOptions;

					// Return field element.
					return el(
						SelectControl,
						fieldProperties
					);
					break;

				case 'toggle':
					// Define field properties.
					fieldProperties.checked = props.attributes[ attribute ];

					// Return field element.
					return el(
						ToggleControl,
						fieldProperties
					);
					break;

				case 'number':
					// Define field properties.
					fieldProperties.type = field.type;
					fieldProperties.min  = field.min;
					fieldProperties.max  = field.max;
					fieldProperties.step = field.step;

					// Return field element.
					return el(
						TextControl,
						fieldProperties
					);
					break;

				default:
					// Return field element.
					return el(
						TextControl,
						fieldProperties
					);
					break;
			}

		}

		/**
		 * Return an array of rows to display in the given block sidebar's panel when
		 * this block is being edited.
		 *
		 * @since   2.2.0
		 *
		 * @param   object  props   Block properties.
		 * @param   string  panel 	Panel name.
		 * @return  array           Panel rows
		 */
		const getPanelRows = function ( props, panel ) {

			// Build Inspector Control Panel Rows, one for each Field.
			let rows = [];
			for ( let i in block.panels[ panel ].fields ) {
				const attribute = block.panels[ panel ].fields[ i ], // e.g. 'term'.
					field       = block.fields[ attribute ]; // field array.

				// If this field doesn't exist as an attribute in the block's get_attributes(),
				// this is a non-Gutenberg field (such as a color picker for shortcodes),
				// which should be ignored.
				if ( typeof block.attributes[ attribute ] === 'undefined' ) {
					continue;
				}

				rows.push(
					el(
						PanelRow,
						{
							key: attribute
						},
						getField( props, field, attribute )
					)
				);
			}

			return rows;

		}

		/**
		 * Return an array of panels to display in the block's sidebar when the block
		 * is being edited.
		 *
		 * @since   2.2.0
		 *
		 * @param   object  props 	Block formatter properties.
		 * @return 	array 			Block sidebar panels.
		 */
		const getPanels = function ( props ) {

			let panels      = [],
				initialOpen = true;

			// Build Inspector Control Panels.
			for ( const panel in block.panels ) {
				let panelRows = getPanelRows( props, panel );

				// If no panel rows exist (e.g. this is a shortcode only panel,
				// for styles, which Gutenberg registers in its own styles tab),
				// don't add this panel.
				if ( ! panelRows.length ) {
					continue;
				}

				panels.push(
					el(
						PanelBody,
						{
							title: block.panels[ panel ].label,
							key: panel,
							initialOpen: initialOpen
						},
						panelRows
					)
				);

				// Don't open any further panels.
				initialOpen = false;
			}

			return panels;

		}

		/**
		 * Display settings sidebar when the block is being edited, and save
		 * changes that are made.
		 *
		 * @since   2.2.0
		 *
		 * @param   object  props   Block properties.
		 * @return  object          Block settings sidebar elements
		 */
		const editBlock = function ( props ) {

			// If requesting an example of how this block looks (which is requested
			// when the user adds a new block and hovers over this block's icon),
			// show the preview image.
			if ( props.attributes.is_gutenberg_example === true ) {
				return (
					Fragment,
					{},
					el(
						'img',
						{
							src: block.gutenberg_example_image,
						}
					)
				);
			}

			// Build Inspector Control Panels, which will appear in the Sidebar when editing the Block.
			let panels = getPanels( props );

			// Generate Block Preview.
			let preview = '';

			// If no API Key has been defined in the Plugin, or no resources exist in ConvertKit
			// for this block, show a message in the block to tell the user what to do.
			if ( ! block.has_api_key || ! block.has_resources ) {
				return displayNoticeWithLink( props );
			}

			if ( typeof block.gutenberg_preview_render_callback !== 'undefined' ) {
				// Use a custom callback function to render this block's preview in the Gutenberg Editor.
				// This doesn't affect the output for this block on the frontend site, which will always
				// use the block's PHP's render() function.
				preview = window[ block.gutenberg_preview_render_callback ]( block, props );
			}

			// Return settings sidebar panel with fields and the block preview.
			return (
				el(
					// Sidebar Panel with Fields.
					Fragment,
					{},
					el(
						InspectorControls,
						{},
						panels
					),
					// Block Preview.
					preview
				)
			);

		}

		/**
		 * Display a notice in the block with a clickable link to perform an action, and a refresh
		 * button to trigger editBlock().  Typically used when no API key exists in the Plugin,
		 * or no resources (forms, products) exist in ConvertKit.
		 *
		 * @since 	2.2.5
		 *
		 * @param   object  props   Block properties.
		 * @return  object          Notice.
		 */
		const displayNoticeWithLink = function ( props ) {

			// useState to toggle the refresh button's disabled state.
			const [ buttonDisabled, setButtonDisabled ] = useState( false );

			// Holds the array of elements to display in the notice component.
			let elements;

			// Define elements to display, based on whether the refresh button is disabled.
			if ( buttonDisabled ) {
				// Refresh button disabled; display a spinner and the button.
				elements = [
					spinner( props ),
					refreshButton( props, buttonDisabled, setButtonDisabled )
				];
			} else {
				// Refresh button enabled; display the notice, link and button.
				elements = [
					( ! block.has_api_key ? block.no_api_key.notice : block.no_resources.notice ),
					noticeLink( props, setButtonDisabled ),
					refreshButton( props, buttonDisabled, setButtonDisabled )
				];
			}

			// Return the element.
			return el(
				'div',
				{
					// convertkit-no-content class allows resources/backend/css/gutenberg.css
					// to apply styling/branding to the block.
					className: 'convertkit-' + block.name + ' convertkit-no-content'
				},
				elements
			);

		}

		/**
		 * Returns a spinner element, to show that a block is loading / refreshing.
		 *
		 * @since 	2.2.6
		 *
		 * @param   object  props   			Block properties.
		 * @return  object          			Spinner.
		 */
		const spinner = function ( props ) {

			return el(
				'span',
				{
					key: props.clientId + '-spinner',
					className: 'spinner is-active'
				}
			);

		}

		/**
		 * Returns a WordPress Dashicon element.
		 *
		 * @since 	2.2.6
		 *
		 * @param   string 	iconName 	Dashicon Name.
		 * @return  object 				Dashicon.
		 */
		const dashIcon = function ( iconName ) {

			return el(
				Dashicon,
				{
					icon: iconName
				}
			);

		}

		/**
		 * Returns the notice link for the displayNoticeWithLink element.
		 *
		 * @since 	2.2.6
		 *
		 * @param   object  props   			Block properties.
		 * @param 	object 	setButtonDisabled 	Function to enable or disable the refresh button.
		 * @return  object          			Notice Link.
		 */
		const noticeLink = function ( props, setButtonDisabled ) {

			return el(
				'a',
				{
					key: props.clientId + '-notice-link',
					href: ( ! block.has_api_key ? block.no_api_key.link : block.no_resources.link ),
					className: ( ! block.has_api_key ? 'convertkit-block-modal' : '' ),
					target: '_blank',
					onClick: function ( e ) {

						// Show popup window with setup wizard if we need to define an API Key.
						if ( ! block.has_api_key ) {
							e.preventDefault();
							showConvertKitPopupWindow( props, e.target, setButtonDisabled );
						}

						// Allow the link to load, as it's likely a link to the ConvertKit site.
					}
				},
				( ! block.has_api_key ? block.no_api_key.link_text : block.no_resources.link_text )
			);

		}

		/**
		 * Returns a refresh button, used to refresh a block when it has no API Keys
		 * or resources.
		 *
		 * @since 	2.2.6
		 *
		 * @param 	object 	props 				Block properties.
		 * @param 	bool 	buttonDisabled 		Whether the refresh button is disabled (true) or enabled (false)/
		 * @param 	object 	setButtonDisabled 	Function to enable or disable the refresh button.
		 * @return 	object 						Button.
		 */
		const refreshButton = function ( props, buttonDisabled, setButtonDisabled ) {

			return el(
				Button,
				{
					key: props.clientId + '-refresh-button',
					className: 'button button-secondary convertkit-block-refresh',
					disabled: buttonDisabled,
					text: 'Refresh',
					icon: dashIcon( 'update' ),
					onClick: function () {

						// Refresh block definitions.
						refreshBlocksDefinitions( props, setButtonDisabled );

					}
				}
			)

		}

		/**
		 * Displays a new window with a given width and height to display the given URL.
		 *
		 * Typically used for displaying a modal version of the Setup Wizard, where the
		 * user clicks the 'click here to add your API Key' link in a block, and then
		 * enters their API Key and Secret.  Will be used to show the ConvertKit
		 * oAuth window in the future.
		 *
		 * @since 	2.2.6
		 *
		 * @param 	object 	props 				Block properties.
		 * @param 	object 	link 				Link that was clicked.
		 * @param 	object 	setButtonDisabled 	Function to enable or disable the refresh button.
		 */
		const showConvertKitPopupWindow = function ( props, link, setButtonDisabled ) {

			// Define popup width, height and positioning.
			const 	width  = 640,
					height = 520,
					top    = ( window.screen.height - height ) / 2,
					left   = ( window.screen.width - width ) / 2;

			// Open popup.
			const convertKitPopup = window.open(
				link.href + '&convertkit-modal=1',
				'convertkit_popup_window',
				'toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=' + width + ',height=' + height + ',top=' + top + ',left=' + left
			);

			// Center popup and focus.
			convertKitPopup.moveTo( left, top );
			convertKitPopup.focus();

			// Refresh the block when the popup is closed using self.close().
			// Won't fire if the user closes the popup manually, which is fine because that means
			// they didn't complete the steps, so refreshing wouldn't show anything new.
			// The onbeforeunload would seem suitable here, but it fires whenever the popup window's
			// document changes (e.g. as the user steps through a wizard), and doesn't fire when
			// the window is closed.
			// See https://stackoverflow.com/questions/9388380/capture-the-close-event-of-popup-window-in-javascript/48240128#48240128.
			var convertKitPopupTimer = setInterval(
				function () {
					if ( convertKitPopup.closed ) {
						clearInterval( convertKitPopupTimer );

						// Refresh block.
						refreshBlocksDefinitions( props, setButtonDisabled );
					}
				},
				1000
			);

		}

		/**
		 * Refreshes this block's properties by:
		 * - making an AJAX call to fetch all registered blocks via convertkit_get_blocks(),
		 * - storing the registered blocks in the `convertkit_blocks` global object,
		 * - updating this block's properties by updating the `block` object.
		 *
		 * @since 	2.2.6
		 *
		 * @param   object  props   			Block properties.
		 * @param 	object 	setButtonDisabled 	Function to enable or disable the refresh button.
		 * @return  object          			Notice.
		 */
		const refreshBlocksDefinitions = function ( props, setButtonDisabled ) {

			// Define data for WordPress AJAX request.
			let data = new FormData();
			data.append( 'action', 'convertkit_get_blocks' );
			data.append( 'nonce', convertkit_gutenberg.get_blocks_nonce );

			// Disable the button.
			setButtonDisabled( true );

			// Send AJAX request.
			fetch(
				ajaxurl,
				{
					method: 'POST',
					credentials: 'same-origin',
					body: data
				}
			)
			.then(
				function ( response ) {

					// Convert response JSON string to object.
					return response.json();

				}
			)
			.then(
				function ( response ) {

					// Update global ConvertKit Blocks object, so that any updated resources
					// are reflected when adding new ConvertKit Blocks.
					convertkit_blocks = response.data;

					// Update this block's properties, so that has_api_key, has_resources
					// and the resources properties are updated.
					block = convertkit_blocks[ block.name ];

					// Call setAttributes on props to trigger the editBlock() function, which will re-render
					// the block, reflecting any changes to its properties.
					props.setAttributes(
						{
							refresh: Date.now()
						}
					);

					// Enable refresh button.
					setButtonDisabled( false );

				}
			)
			.catch(
				function ( error ) {

					// Show an error in the Gutenberg editor.
					wp.data.dispatch( 'core/notices' ).createErrorNotice(
						'ConvertKit: ' + error,
						{
							id: 'convertkit-error'
						}
					);

					// Enable refresh button.
					setButtonDisabled( false );

				}
			);

		}

		// Register Block.
		registerBlockType(
			'convertkit/' + block.name,
			{
				title:      block.title,
				description:block.description,
				category:   block.category,
				icon:       getIcon,
				keywords: 	block.keywords,
				attributes: block.attributes,
				supports: 	block.supports,
				example: 	{
					attributes: {
						is_gutenberg_example: true,
					}
				},

				// Editor.
				edit: editBlock,

				// Output.
				save: function ( props ) {

					// Deliberate; preview in the editor is determined by the return statement in `edit` above.
					// On the frontend site, the block's render() PHP class is always called, so we dynamically
					// fetch the content.
					return null;

				},
			}
		);

	} (
		window.wp.blocks,
		window.wp.blockEditor,
		window.wp.element,
		window.wp.components
	) );

}

/**
 * Registers pre-publish actions in Gutenberg's pre-publish checks panel.
 *
 * @since 	2.4.0
 *
 * @param 	object 	actions 	Pre-publish actions.
 */
function convertKitGutenbergRegisterPrePublishActions( actions ) {

	( function ( plugins, editPost, element, components, data ) {

		// Define some constants for the various items we'll use.
		const el                                 = element.createElement;
		const { ToggleControl }                  = components;
		const { registerPlugin }                 = plugins;
		const { PluginPrePublishPanel }          = editPost;
		const { useSelect, useDispatch, select } = data;

		/**
		 * Returns a PluginPrePublishPanel for this Plugin, comprising of all
		 * pre-publish actions.
		 *
		 * @since   2.4.0
		 *
		 * @return  PluginPrePublishPanel
		 */
		const renderPanel = function () {

			// Bail if the Post Type isn't a Post.
			if ( select( 'core/editor' ).getCurrentPostType() !== 'post' ) {
				return;
			}

			// Build rows.
			let rows = [];
			for ( const [ name, action ] of Object.entries( actions ) ) {

				const key          = '_convertkit_action_' + action.name;
				const { meta }     = useSelect(
					function ( select ) {
						return {
							meta: select( 'core/editor' ).getEditedPostAttribute( 'meta' ),
						};
					}
				);
				const { editPost } = useDispatch( 'core/editor', [ meta[ key ] ] );

				// Add row.
				rows.push(
					el(
						ToggleControl,
						{
							id:  		'convertkit_action_' + action.name,
							label: 		action.label,
							help: 		action.description,
							value:      true,
							checked: 	meta[ key ],
							onChange: 	function ( value ) {
								editPost(
									{
										meta: { [ key ]: value },
									}
								);
							}
						}
					)
				);
			}

			// Return actions in the pre-publish panel.
			return el(
				PluginPrePublishPanel,
				{
					className: 'convertkit-pre-publish-actions',
					title: 'ConvertKit',
					initialOpen: true,
				},
				rows
			);

		}

		// Register pre-publish actions.
		registerPlugin(
			'convertkit-pre-publish-actions',
			{
				render: renderPanel
			}
		);

	} (
		window.wp.plugins,
		window.wp.editPost,
		window.wp.element,
		window.wp.components,
		window.wp.data
	) );

}

/**
 * Outputs a notice for the block.  Typically used when a block's settings
 * have not been defined, no API key exists in the Plugin or no resources
 * (forms, products) exist in ConvertKit, and the user adds an e.g.
 * Form / Product block.
 *
 * @since 	2.2.3
 *
 * @param 	string 	block_name 	Block Name.
 * @param 	string 	notice 		Notice to display.
 * @return 	object 				HTMLElement
 */
function convertKitGutenbergDisplayBlockNotice( block_name, notice ) {

	return wp.element.createElement(
		'div',
		{
			// convertkit-no-content class allows resources/backend/css/gutenberg.css
			// to apply styling/branding to the block.
			className: 'convertkit-' + block_name + ' convertkit-no-content'
		},
		notice
	);

}