<?php

/**

 * Server-side rendering of the `core/query-pagination-previous` block.

 *

 * @package WordPress

 */

/**

 * Renders the `core/query-pagination-previous` 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 previous posts link for the query.

 */

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

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

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

	$wrapper_attributes = get_block_wrapper_attributes();

	$default_label      = __( '« Previous Page' );

	$label              = isset( $attributes['label'] ) && ! empty( $attributes['label'] ) ? $attributes['label'] : $default_label;

	$content            = '';

	// Check if the pagination is for Query that inherits the global context

	// and handle appropriately.

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

		$filter_link_attributes = function() use ( $wrapper_attributes ) {

			return $wrapper_attributes;

		};

		add_filter( 'previous_posts_link_attributes', $filter_link_attributes );

		$content = get_previous_posts_link( $label );

		remove_filter( 'previous_posts_link_attributes', $filter_link_attributes );

	} elseif ( 1 !== $page ) {

		$content = sprintf(

			'<a href="%1$s" %2$s>%3$s</a>',

			esc_url( add_query_arg( $page_key, $page - 1 ) ),

			$wrapper_attributes,

			$label

		);

	}

	return $content;

}

/**

 * Registers the `core/query-pagination-previous` block on the server.

 */

function register_block_core_query_pagination_previous() {

	register_block_type_from_metadata(

		__DIR__ . '/query-pagination-previous',

		array(

			'render_callback' => 'render_block_core_query_pagination_previous',

		)

	);

}

add_action( 'init', 'register_block_core_query_pagination_previous' );