<?php

/**

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

 *

 * @package WordPress

 */

/**

 * Renders the `core/comments-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 comments pagination.

 */

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

	$default_label    = __( 'Older Comments' );

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

	$pagination_arrow = get_comments_pagination_arrow( $block, 'previous' );

	if ( $pagination_arrow ) {

		$label = $pagination_arrow . $label;

	}

	$filter_link_attributes = function() {

		return get_block_wrapper_attributes();

	};

	add_filter( 'previous_comments_link_attributes', $filter_link_attributes );

	$previous_comments_link = get_previous_comments_link( $label );

	remove_filter( 'previous_comments_link_attributes', $filter_link_attributes );

	if ( ! isset( $previous_comments_link ) ) {

		return '';

	}

	return $previous_comments_link;

}

/**

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

 */

function register_block_core_comments_pagination_previous() {

	register_block_type_from_metadata(

		__DIR__ . '/comments-pagination-previous',

		array(

			'render_callback' => 'render_block_core_comments_pagination_previous',

		)

	);

}

add_action( 'init', 'register_block_core_comments_pagination_previous' );