<?php

/**

 * Server-side rendering of the `core/post-template` block.

 *

 * @package WordPress

 */

/**

 * Determines whether a block list contains a block that uses the featured image.

 *

 * @since 6.0.0

 *

 * @param WP_Block_List $inner_blocks Inner block instance.

 *

 * @return bool Whether the block list contains a block that uses the featured image.

 */

function block_core_post_template_uses_featured_image( $inner_blocks ) {

	foreach ( $inner_blocks as $block ) {

		if ( 'core/post-featured-image' === $block->name ) {

			return true;

		}

		if (

			'core/cover' === $block->name &&

			! empty( $block->attributes['useFeaturedImage'] )

		) {

			return true;

		}

		if ( $block->inner_blocks && block_core_post_template_uses_featured_image( $block->inner_blocks ) ) {

			return true;

		}

	}

	return false;

}

/**

 * Renders the `core/post-template` block on the server.

 *

 * @since 6.3.0 Changed render_block_context priority to `1`.

 *

 * @global WP_Query $wp_query WordPress Query object.

 *

 * @param array    $attributes Block attributes.

 * @param string   $content    Block default content.

 * @param WP_Block $block      Block instance.

 *

 * @return string Returns the output of the query, structured using the layout defined by the block's inner blocks.

 */

function render_block_core_post_template( $attributes, $content, $block ) {

	$page_key            = isset( $block->context['queryId'] ) ? 'query-' . $block->context['queryId'] . '-page' : 'query-page';

	$enhanced_pagination = isset( $block->context['enhancedPagination'] ) && $block->context['enhancedPagination'];

	$page                = empty( $_GET[ $page_key ] ) ? 1 : (int) $_GET[ $page_key ];

	// Use global query if needed.

	$use_global_query = ( isset( $block->context['query']['inherit'] ) && $block->context['query']['inherit'] );

	if ( $use_global_query ) {

		global $wp_query;

		/*

		 * If already in the main query loop, duplicate the query instance to not tamper with the main instance.

		 * Since this is a nested query, it should start at the beginning, therefore rewind posts.

		 * Otherwise, the main query loop has not started yet and this block is responsible for doing so.

		 */

		if ( in_the_loop() ) {

			$query = clone $wp_query;

			$query->rewind_posts();

		} else {

			$query = $wp_query;

		}

	} else {

		$query_args = build_query_vars_from_query_block( $block, $page );

		$query      = new WP_Query( $query_args );

	}

	if ( ! $query->have_posts() ) {

		return '';

	}

	if ( block_core_post_template_uses_featured_image( $block->inner_blocks ) ) {

		update_post_thumbnail_cache( $query );

	}

	$classnames = '';

	if ( isset( $block->context['displayLayout'] ) && isset( $block->context['query'] ) ) {

		if ( isset( $block->context['displayLayout']['type'] ) && 'flex' === $block->context['displayLayout']['type'] ) {

			$classnames = "is-flex-container columns-{$block->context['displayLayout']['columns']}";

		}

	}

	if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {

		$classnames .= ' has-link-color';

	}

	// Ensure backwards compatibility by flagging the number of columns via classname when using grid layout.

	if ( isset( $attributes['layout']['type'] ) && 'grid' === $attributes['layout']['type'] && ! empty( $attributes['layout']['columnCount'] ) ) {

		$classnames .= ' ' . sanitize_title( 'columns-' . $attributes['layout']['columnCount'] );

	}

	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => trim( $classnames ) ) );

	$content = '';

	while ( $query->have_posts() ) {

		$query->the_post();

		// Get an instance of the current Post Template block.

		$block_instance = $block->parsed_block;

		// Set the block name to one that does not correspond to an existing registered block.

		// This ensures that for the inner instances of the Post Template block, we do not render any block supports.

		$block_instance['blockName'] = 'core/null';

		$post_id              = get_the_ID();

		$post_type            = get_post_type();

		$filter_block_context = static function ( $context ) use ( $post_id, $post_type ) {

			$context['postType'] = $post_type;

			$context['postId']   = $post_id;

			return $context;

		};

		// Use an early priority to so that other 'render_block_context' filters have access to the values.

		add_filter( 'render_block_context', $filter_block_context, 1 );

		// Render the inner blocks of the Post Template block with `dynamic` set to `false` to prevent calling

		// `render_callback` and ensure that no wrapper markup is included.

		$block_content = ( new WP_Block( $block_instance ) )->render( array( 'dynamic' => false ) );

		remove_filter( 'render_block_context', $filter_block_context, 1 );

		// Wrap the render inner blocks in a `li` element with the appropriate post classes.

		$post_classes = implode( ' ', get_post_class( 'wp-block-post' ) );

		$inner_block_directives = $enhanced_pagination ? ' data-wp-key="post-template-item-' . $post_id . '"' : '';

		$content .= '<li' . $inner_block_directives . ' class="' . esc_attr( $post_classes ) . '">' . $block_content . '</li>';

	}

	/*

	 * Use this function to restore the context of the template tags

	 * from a secondary query loop back to the main query loop.

	 * Since we use two custom loops, it's safest to always restore.

	*/

	wp_reset_postdata();

	return sprintf(

		'<ul %1$s>%2$s</ul>',

		$wrapper_attributes,

		$content

	);

}

/**

 * Registers the `core/post-template` block on the server.

 *

 * @since 5.8.0

 */

function register_block_core_post_template() {

	register_block_type_from_metadata(

		__DIR__ . '/post-template',

		array(

			'render_callback'   => 'render_block_core_post_template',

			'skip_inner_blocks' => true,

		)

	);

}

add_action( 'init', 'register_block_core_post_template' );