<?php

/**

 * Server-side rendering of the `core/query-no-results` block.

 *

 * @package WordPress

 */

/**

 * Renders the `core/query-no-results` block on the server.

 *

 * @param array    $attributes Block attributes.

 * @param string   $content    Block default content.

 * @param WP_Block $block      Block instance.

 *

 * @return string Returns the wrapper for the no results block.

 */

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

	if ( empty( trim( $content ) ) ) {

		return '';

	}

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

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

	// Override the custom query with the global query if needed.

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

	if ( $use_global_query ) {

		global $wp_query;

		$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 ( ! $use_global_query ) {

		wp_reset_postdata();

	}

	return sprintf(

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

		get_block_wrapper_attributes(),

		$content

	);

}

/**

 * Registers the `core/query-no-results` block on the server.

 */

function register_block_core_query_no_results() {

	register_block_type_from_metadata(

		__DIR__ . '/query-no-results',

		array(

			'render_callback' => 'render_block_core_query_no_results',

		)

	);

}

add_action( 'init', 'register_block_core_query_no_results' );