<?php
/**
 * Facilitates force migration of certain blocks into core blocks.
 *
 * @package CoBlocks
 */

/**
 * Require needed classes.
 */
require_once COBLOCKS_PLUGIN_DIR . 'includes/block-migrate/class-coblocks-block-migration-runner.php';
require_once COBLOCKS_PLUGIN_DIR . 'includes/block-migrate/class-coblocks-block-migration.php';

/**
 * Require migration classes.
 */
require_once COBLOCKS_PLUGIN_DIR . 'includes/block-migrate/class-coblocks-alert-migration.php';
require_once COBLOCKS_PLUGIN_DIR . 'includes/block-migrate/class-coblocks-author-migration.php';

/**
 * Hook into the post object before it's returned to the editor.
 *
 * This allows us to "force migrate" our blocks by removing and parsing the
 * previous output for attributes and re-serializing the block to
 * only include its comment delimiters.
 */
add_action(
	'the_post',
	function( WP_Post &$post ) {
		if ( ! function_exists( 'is_admin' ) || ! function_exists( 'get_current_screen' ) || is_null( get_current_screen() ) ) {
			return;
		}

		if ( ! is_admin() || ! get_current_screen()->is_block_editor ) {
			return;
		}

		// Bail if DOMDocument is not available.
		if ( ! class_exists( 'DOMDocument' ) ) {
			return;
		}

		// Parse the blocks so we can search them in a standard way.
		$parsed_blocks = parse_blocks( $post->post_content );

		// Load our available migrations.
		$migration_runner = new CoBlocks_Block_Migration_Runner();

		array_map(
			array( $migration_runner, 'register' ),
			array(
				CoBlocks_Alert_Migration::class,
				CoBlocks_Author_Migration::class,
			)
		);

		$parsed_blocks = array_map( array( $migration_runner, 'migrate_block' ), $parsed_blocks );

		// re-serialize the blocks so WordPress can continue processing as usual.
		$post->post_content = serialize_blocks( $parsed_blocks );
	}
);