<?php

/**

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

 *

 * @package WordPress

 */

/**

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

 *

 * @since 5.8.0

 *

 * @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';

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

	$max_page            = isset( $block->context['query']['pages'] ) ? (int) $block->context['query']['pages'] : 0;

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

	$wrapper_attributes  = get_block_wrapper_attributes();

	$show_label          = isset( $block->context['showLabel'] ) ? (bool) $block->context['showLabel'] : true;

	$default_label       = __( 'Previous Page' );

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

	$label               = $show_label ? $label_text : '';

	$pagination_arrow    = get_query_pagination_arrow( $block, false );

	if ( ! $label ) {

		$wrapper_attributes .= ' aria-label="' . $label_text . '"';

	}

	if ( $pagination_arrow ) {

		$label = $pagination_arrow . $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 = static 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 );

	} else {

		$block_query     = new WP_Query( build_query_vars_from_query_block( $block, $page ) );

		$block_max_pages = $block_query->max_num_pages;

		$total           = ! $max_page || $max_page > $block_max_pages ? $block_max_pages : $max_page;

		wp_reset_postdata();

		if ( 1 < $page && $page <= $total ) {

			$content = sprintf(

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

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

				$wrapper_attributes,

				$label

			);

		}

	}

	if ( $enhanced_pagination && isset( $content ) ) {

		$p = new WP_HTML_Tag_Processor( $content );

		if ( $p->next_tag(

			array(

				'tag_name'   => 'a',

				'class_name' => 'wp-block-query-pagination-previous',

			)

		) ) {

			$p->set_attribute( 'data-wp-key', 'query-pagination-previous' );

			$p->set_attribute( 'data-wp-on--click', 'core/query::actions.navigate' );

			$p->set_attribute( 'data-wp-on-async--mouseenter', 'core/query::actions.prefetch' );

			$p->set_attribute( 'data-wp-watch', 'core/query::callbacks.prefetch' );

			$content = $p->get_updated_html();

		}

	}

	return $content;

}

/**

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

 *

 * @since 5.8.0

 */

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' );