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<?php
/**
 * /lib/compatibility/gutenberg.php
 *
 * Gutenberg compatibility features.
 *
 * @package Relevanssi
 * @author  Mikko Saari
 * @license https://wordpress.org/about/gpl/ GNU General Public License
 * @see     https://www.relevanssi.com/
 */

add_filter( 'relevanssi_post_content', 'relevanssi_gutenberg_block_rendering', 10, 2 );

/**
 * Registers rest_after_insert_{post_type} actions for all indexed post types.
 *
 * Runs on `admin_init` action hook and registers the function
 * `relevanssi_save_gutenberg_postdata` for all indexed post types.
 *
 * @see relevanssi_save_gutenberg_postdata
 */
function relevanssi_register_gutenberg_actions() {
	if ( ! RELEVANSSI_PREMIUM ) {
		return;
	}
	$index_post_types = get_option( 'relevanssi_index_post_types', array() );
	array_walk(
		$index_post_types,
		function ( $post_type ) {
			if ( 'bogus' !== $post_type ) {
				add_action(
					'rest_after_insert_' . $post_type,
					'relevanssi_save_gutenberg_postdata'
				);
			}
		}
	);
}

/**
 * Renders Gutenberg blocks.
 *
 * Renders all sorts of Gutenberg blocks, including reusable blocks and ACF
 * blocks. Also enables basic Gutenberg deindexing: you can add an extra CSS
 * class 'relevanssi_noindex' to a block to stop it from being indexed by
 * Relevanssi. This function is essentially the same as core do_blocks().
 *
 * @see do_blocks()
 *
 * @param string $content     The post content.
 * @param object $post_object The post object.
 *
 * @return string The post content with the rendered content added.
 */
function relevanssi_gutenberg_block_rendering( $content, $post_object ) {
	/**
	 * Filters whether the blocks are rendered or not.
	 *
	 * If this filter returns false, the blocks in this post are not rendered,
	 * and the post content is returned as such.
	 *
	 * @param boolean If true, render the blocks. Default true.
	 * @param object  The post object.
	 */
	if ( ! apply_filters( 'relevanssi_render_blocks', true, $post_object ) ) {
		return $content;
	}
	$blocks = parse_blocks( $content );
	$output = '';

	foreach ( $blocks as $block ) {
		/**
		 * Filters the Gutenberg block before it is rendered.
		 *
		 * If the block is non-empty after the filter and it's className
		 * parameter is not 'relevanssi_noindex', it will be passed on to the
		 * render_block() function for rendering.
		 *
		 * @see render_block
		 *
		 * @param array $block The Gutenberg block element.
		 */
		$block = apply_filters( 'relevanssi_block_to_render', $block );

		if ( ! $block ) {
			continue;
		}

		if (
			isset( $block['attrs']['className'] )
			&& false !== strstr( $block['attrs']['className'], 'relevanssi_noindex' )
			) {
			continue;
		}

		$block = relevanssi_process_inner_blocks( $block );

		/**
		 * Filters the Gutenberg block after it is rendered.
		 *
		 * The value is the output from render_block( $block ). Feel free to
		 * modify it as you wish.
		 *
		 * @see render_block
		 *
		 * @param string The rendered block content.
		 * @param array  $block The Gutenberg block being rendered.
		 *
		 * @return string The filtered block content.
		 */
		$output .= apply_filters( 'relevanssi_rendered_block', render_block( $block ), $block );

	}

	// If there are blocks in this content, we shouldn't run wpautop() on it later.
	$priority = has_filter( 'the_content', 'wpautop' );
	if ( false !== $priority && doing_filter( 'the_content' ) && has_blocks( $content ) ) {
		remove_filter( 'the_content', 'wpautop', $priority );
		add_filter( 'the_content', '_restore_wpautop_hook', $priority + 1 );
	}

	return $output;
}

/**
 * Runs recursively through inner blocks to filter them.
 *
 * Runs relevanssi_block_to_render and the relevanssi_noindex CSS class check
 * on all inner blocks. If inner blocks are filtered out, they will be removed
 * with empty blocks of the type "core/fake". Removing the inner blocks causes
 * problems; that's why they are replaced. The blocks are rendered here;
 * everything will be rendered once at the top level.
 *
 * @param array $block A Gutenberg block.
 *
 * @return array The filtered block.
 */
function relevanssi_process_inner_blocks( $block ) {
	$innerblocks_to_keep = array();

	$empty_block = array(
		'blockName'   => 'core/fake',
		'attrs'       => array(),
		'innerHTML'   => '',
		'innerBlocks' => array(),
	);

	foreach ( $block['innerBlocks'] as $inner_block ) {
		/* Filter documented in /lib/compatibility/gutenberg.php. */
		$inner_block = apply_filters( 'relevanssi_block_to_render', $inner_block );

		if ( ! $inner_block ) {
			$innerblocks_to_keep[] = $empty_block;
			continue;
		}

		if (
			isset( $inner_block['attrs']['className'] )
			&& false !== strstr( $inner_block['attrs']['className'], 'relevanssi_noindex' )
			) {
			$innerblocks_to_keep[] = $empty_block;
			continue;
		}

		$inner_block = relevanssi_process_inner_blocks( $inner_block );

		$innerblocks_to_keep[] = $inner_block;
	}

	$block['innerBlocks'] = $innerblocks_to_keep;
	return $block;
}