<?php
namespace Affilizz\Editor;

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

class Gutenberg {
	/**
	 * Hooks to the default WordPress hooks to enable custom features.
	 * @author Affilizz <wordpress@affilizz.com>
	 * @return void
	 */
	public function __construct() {
		// Invite WordPress to register the custom Gutenberg blocks
		add_action( 'init', array( $this, 'register_blocks' ) );

		// In apiVersion 3 the block's editor script runs inside an iframe.
		// Localize affilizz_l10n on the block's own handle so the data is
		// available there (the global localized for `affilizz-admin` lives in
		// the parent frame and is not visible from inside the iframe).
		add_action( 'enqueue_block_editor_assets', array( $this, 'localize_block_editor_data' ) );
		add_action( 'enqueue_block_editor_assets', array( $this, 'enqueue_legacy_shortcode_migration' ) );
		add_action( 'enqueue_block_assets', array( $this, 'enqueue_rendering_assets' ) );
	}

	/**
	 * Registers the Affilizz publication gutenberg block
	 */
	public function register_blocks() {
		register_block_type( AFFILIZZ_DIRECTORY . 'assets/dist/blocks/publication' );
	}

	/**
	 * Localizes affilizz_l10n on the block's editor script so the iframe sees it.
	 */
	public function localize_block_editor_data() {
		$core = \Affilizz\Core::get_instance();
		$core->load_translations();
		wp_localize_script(
			'affilizz-publication-editor-script',
			'affilizz_l10n',
			$core->get_javascript_l10n()
		);
	}

	/**
	 * Enqueues the Affilizz rendering web component runtime in the block editor iframe.
	 */
	public function enqueue_rendering_assets() {
		if ( ! is_admin() || ! function_exists( 'get_current_screen' ) ) {
			return;
		}

		$screen = get_current_screen();
		if ( empty( $screen ) || ! method_exists( $screen, 'is_block_editor' ) || ! $screen->is_block_editor() ) {
			return;
		}

		wp_enqueue_script(
			'affilizz-rendering',
			( \Affilizz\Util\Assets::get_instance() )->get_diverted_js_file_url(),
			array(),
			AFFILIZZ_VERSION,
			array( 'strategy' => 'defer' )
		);
	}

	/**
	 * Converts legacy raw Affilizz shortcode blocks to the dedicated block in the parent editor frame.
	 */
	public function enqueue_legacy_shortcode_migration() {
		wp_register_script(
			'affilizz-legacy-shortcode-migration',
			false,
			array( 'wp-blocks', 'wp-data', 'wp-dom-ready' ),
			AFFILIZZ_ASSETS_BUILD_VERSION,
			true
		);
		wp_enqueue_script( 'affilizz-legacy-shortcode-migration' );
		wp_add_inline_script(
			'affilizz-legacy-shortcode-migration',
			"( function( wp ) {
	if ( ! wp || ! wp.blocks || ! wp.data || ! wp.domReady ) {
		return;
	}

	var singleShortcodePattern = /^\\s*(?:<p[^>]*>\\s*)?\\[affilizz-publication\\b([^\\]]*)\\]\\s*(?:<\\/p>)?\\s*$/i;
	var paragraphShortcodePattern = /(?:<p[^>]*>\\s*)?\\[affilizz-publication\\b([^\\]]*)\\]\\s*(?:<\\/p>)?/gi;
	var attempts = 0;
	var isConverting = false;
	var unsubscribe = null;

	function decodeHtmlEntities( value ) {
		var textarea = document.createElement( 'textarea' );
		textarea.innerHTML = value;
		return textarea.value;
	}

	function getIdFromAttributes( attributes ) {
		var idMatch = attributes.match( /\\bid\\s*=\\s*(?:\"([^\"]+)\"|'([^']+)'|([^\\s\\]]+))/i );
		return idMatch ? ( idMatch[1] || idMatch[2] || idMatch[3] || '' ) : '';
	}

	function getSingleShortcodeId( value ) {
		var shortcode = decodeHtmlEntities( String( value || '' ) );
		var shortcodeMatch = shortcode.match( singleShortcodePattern );

		if ( ! shortcodeMatch ) {
			return false;
		}

		return getIdFromAttributes( shortcodeMatch[1] );
	}

	function getFreeformShortcodeIds( block ) {
		if ( block.name !== 'core/freeform' && block.name !== 'core/html' ) {
			return false;
		}

		var content = decodeHtmlEntities( String( ( block.attributes && block.attributes.content ) || '' ) );
		var remainingContent = content.replace( paragraphShortcodePattern, '' ).trim();
		var ids = [];
		var match;

		if ( remainingContent ) {
			return false;
		}

		paragraphShortcodePattern.lastIndex = 0;

		while ( ( match = paragraphShortcodePattern.exec( content ) ) !== null ) {
			ids.push( getIdFromAttributes( match[1] ) );
		}

		paragraphShortcodePattern.lastIndex = 0;

		return ids.length ? ids : false;
	}

	function getSingleBlockShortcodeId( block ) {
		if ( block.name === 'core/paragraph' ) {
			return getSingleShortcodeId( block.attributes && block.attributes.content );
		}

		if ( block.name === 'core/shortcode' ) {
			return getSingleShortcodeId( block.attributes && ( block.attributes.text || block.attributes.content ) );
		}

		return false;
	}

	function collectLegacyBlocks( blocks ) {
		return blocks.reduce( function( legacyBlocks, block ) {
			var ids = getFreeformShortcodeIds( block );
			var id = getSingleBlockShortcodeId( block );

			if ( ids !== false ) {
				legacyBlocks.push( { clientId: block.clientId, ids: ids } );
			}

			if ( id !== false ) {
				legacyBlocks.push( { clientId: block.clientId, ids: [ id ] } );
			}

			if ( block.innerBlocks && block.innerBlocks.length ) {
				legacyBlocks = legacyBlocks.concat( collectLegacyBlocks( block.innerBlocks ) );
			}

			return legacyBlocks;
		}, [] );
	}

	function convertLegacyBlocks() {
		var blocks = wp.data.select( 'core/block-editor' ).getBlocks();
		var legacyBlocks = collectLegacyBlocks( blocks );

		legacyBlocks.forEach( function( legacyBlock ) {
			wp.data.dispatch( 'core/block-editor' ).replaceBlocks(
				legacyBlock.clientId,
				legacyBlock.ids.map( function( id ) {
					return wp.blocks.createBlock( 'affilizz/publication', { id: id } );
				} )
			);
		} );

		return legacyBlocks.length > 0;
	}

	function runMigration() {
		if ( isConverting ) {
			return;
		}

		attempts += 1;
		isConverting = true;

		var converted = convertLegacyBlocks();

		isConverting = false;

		if ( unsubscribe && ( converted || attempts > 200 ) ) {
			unsubscribe();
		}
	}

	wp.domReady( function() {
		unsubscribe = wp.data.subscribe( runMigration );
		window.setTimeout( runMigration, 0 );
		window.setTimeout( runMigration, 1000 );
		window.setTimeout( runMigration, 3000 );
	} );
}( window.wp ) );"
		);
	}
}