/**
 * Registers formatters in the Block Toolbar in the Gutenberg editor.
 *
 * @since   2.2.0
 *
 * @package ConvertKit
 * @author ConvertKit
 */

// Register Gutenberg Block Toolbar formatters 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 formatter in Gutenberg.
	for ( const formatter in convertkit_block_formatters ) {
		convertKitGutenbergRegisterBlockFormatter( convertkit_block_formatters[ formatter ] );
	}

}

/**
 * Registers the given formatter in Gutenberg.
 *
 * @since   2.2.0
 *
 * @param   object  formatter   Block formatter.
 */
function convertKitGutenbergRegisterBlockFormatter( formatter ) {

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

		// Define the Gutenberg/React components to use.
		const {
			Fragment,
			useState,
			createElement
		} = element;
		const {
			registerFormatType,
			toggleFormat,
			applyFormat,
			useAnchorRef,
			useAnchor
		} = richText;
		const {
			BlockControls,
			RichTextToolbarButton,
		} = editor;
		const {
			Button,
			Popover,
			SelectControl
		} = components;

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

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

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

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

		}

		/**
		 * Returns an object of this formatter's attributes if this formatter
		 * has been used on the selected text.
		 *
		 * Returns blank attributes if this formatter has not been used on the
		 * selected text.
		 *
		 * @since   2.2.0
		 *
		 * @param   object  activeFormats   All active formatters applied to the selected text.
		 * @return  object
		 */
		const getAttributes = function ( activeFormats ) {

			// Define the attribute object.
			let attributes = {};
			for ( let attribute in formatter.attributes ) {
				attributes[ attribute ] = '';
			}

			// Return if no active formats have been applied to the selected text.
			if ( typeof activeFormats === 'undefined' ) {
				return attributes;
			}

			// Return if this formatter has not been used on the selected text.
			const formats = activeFormats.filter( format => 'convertkit/' + formatter.name === format['type'] );
			if ( formats.length === 0 ) {
				return attributes;
			}

			// This formatter has been applied to the selected text.
			// Build the object of attributes and return.
			for ( let attribute in formatter.attributes ) {
				if ( typeof formats[0].unregisteredAttributes !== 'undefined' ) {
					attributes[ attribute ] = formats[0].unregisteredAttributes[ attribute ];
				} else if ( typeof formats[0].attributes !== 'undefined' ) {
					attributes[ attribute ] = formats[0].attributes[ attribute ];
				}
			}

			return attributes;

		}

		/**
		 * Updates the block formatter's attributes when a field in the
		 * formatter's popover modal has its value changed.
		 *
		 * @since   2.2.0
		 *
		 * @param   object  props         Block formatter properties.
		 * @param   array   field         Field definition.
		 * @param   string  newValue      New value
		 */
		const setAttributes = function ( props, field, newValue ) {

			// Define properties and functions to use.
			const { onChange, value } = props;

			// If no value exists, remove the formatter.
			if ( newValue === '' ) {
				return onChange(
					toggleFormat(
						value,
						{
							type: 'convertkit/' + formatter.name
						}
					)
				);
			}

			// Build object of new attributes.
			let attributes = {};
			for ( let attribute in formatter.attributes ) {
				// If 'None' selected, blank the attribute's value.
				if ( newValue === '' ) {
					attributes[ attribute ] = '';
				} else {
					attributes[ attribute ] = field.data[ newValue ][ attribute ];
				}
			}

			// Apply formatter with new attributes.
			return onChange(
				applyFormat(
					value,
					{
						type: 'convertkit/' + formatter.name,
						attributes: attributes
					}
				)
			);

		}

		/**
		 * Return an array of field elements to display in the popover modal when
		 * this formatter is active.
		 *
		 * @since   2.2.0
		 *
		 * @param   object  props           Block formatter properties.
		 * @param   object  setShowPopover  Function to toggle showing/hiding the popover.
		 * @param   object  attributes      Field attributes.
		 * @return  array                   Field elements
		 */
		const getFields = function ( props, setShowPopover, attributes ) {

			// Define array of field elements.
			let elements = [];

			// Return if no fields exist.
			if ( formatter.fields.length === 0 ) {
				return elements;
			}

			// Iterate through the formatter's fields, adding a field element for each.
			for ( let fieldName in formatter.fields ) {
				const field = formatter.fields[ fieldName ];

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

				// 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 );

					}
				);

				// Add field to array.
				elements.push(
					createElement(
						SelectControl,
						{
							key:        'convertkit_' + formatter.name + '_' + fieldName,
							id:         'convertkit-' + formatter.name + '-' + fieldName,
							label:      field.label,
							value:      attributes[ fieldName ],
							help:       field.description,
							options:    fieldOptions,
							onChange:   function ( newValue ) {

								// Hide popover.
								setShowPopover( false );

								// Update and apply attributes to the selected text.
								setAttributes( props, field, newValue );

							}
						}
					)
				);
			}

			// Return elements.
			return elements;

		}

		/**
		 * Display modal when the formatter's button is clicked, and save
		 * changes that are made.
		 *
		 * @since   2.2.0
		 *
		 * @param   object  props   Block formatter properties.
		 * @return  object          Block formatter button and modal elements
		 */
		const editFormatType = function ( props ) {

			// Get props.
			const { contentRef, isActive, value } = props;
			const { activeFormats }               = value;
			let anchorRef;

			// Get anchor reference to the text.
			if ( typeof useAnchor === 'undefined' ) {
				// Use WordPress 6.0 and lower useAnchorRef(), as useAnchor() isn't available.
				anchorRef = useAnchorRef( { ref: contentRef, value } );
			} else {
				// Use WordPress 6.1+ useAnchor(), as useAnchorRef() is deprecated in 6.2+.
				anchorRef = useAnchor( { editableContentElement: contentRef.current, value } );
			}

			// State to show popover.
			const [ showPopover, setShowPopover ] = useState( false );

			// Get attributes.
			let attributes = getAttributes( activeFormats );

			// Define fields to display in the popover modal.
			let popoverModalElements = getFields( props, setShowPopover, attributes );

			// Return block toolbar button and its modal.
			return (
				createElement(
					Fragment,
					{
						key:  'convertkit_' + formatter.name + '_rich_text_toolbar_fragment'
					},
					// Register the button in the rich text toolbar.
					createElement(
						RichTextToolbarButton,
						{
							key:      'convertkit_' + formatter.name + '_rich_text_toolbar_button',
							icon:     getIcon( formatter ),
							title:    formatter.title,
							isActive: isActive,
							onClick:  function () {
								setShowPopover( true );
							}
						},
					),
					// Popover which displays fields when the button is active.
					showPopover && ( createElement(
						Popover,
						{
							key:        'convertkit_' + formatter.name + '_popover',
							className:  'convertkit-popover',
							anchor:     anchorRef,
							onClose:    function () {
								setShowPopover( false );
							}
						},
						popoverModalElements
					) )
				)
			);

		}

		// Register Format Type.
		registerFormatType(
			'convertkit/' + formatter.name,
			{
				title:      formatter.title,

				// The tagName and className combination allow Gutenberg to uniquely identify
				// whether this formatter has been used on the selected text.
				tagName:    formatter.tag,
				className:  'convertkit-' + formatter.name,
				attributes: formatter.attributes,
				edit:       editFormatType,
			}
		);

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

}