<?php

/**

 * Server-side rendering of the `core/comment-reply-link` block.

 *

 * @package WordPress

 */

/**

 * Renders the `core/comment-reply-link` block on the server.

 *

 * @param array    $attributes Block attributes.

 * @param string   $content    Block default content.

 * @param WP_Block $block      Block instance.

 * @return string Return the post comment's reply link.

 */

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

	if ( ! isset( $block->context['commentId'] ) ) {

		return '';

	}

	$thread_comments = get_option( 'thread_comments' );

	if ( ! $thread_comments ) {

		return '';

	}

	$comment = get_comment( $block->context['commentId'] );

	if ( empty( $comment ) ) {

		return '';

	}

	$depth     = 1;

	$max_depth = get_option( 'thread_comments_depth' );

	$parent_id = $comment->comment_parent;

	// Compute comment's depth iterating over its ancestors.

	while ( ! empty( $parent_id ) ) {

		$depth++;

		$parent_id = get_comment( $parent_id )->comment_parent;

	}

	$comment_reply_link = get_comment_reply_link(

		array(

			'depth'     => $depth,

			'max_depth' => $max_depth,

		),

		$comment

	);

	// Render nothing if the generated reply link is empty.

	if ( empty( $comment_reply_link ) ) {

		return;

	}

	$classes = '';

	if ( isset( $attributes['textAlign'] ) ) {

		$classes .= 'has-text-align-' . $attributes['textAlign'];

	}

	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $classes ) );

	return sprintf(

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

		$wrapper_attributes,

		$comment_reply_link

	);

}

/**

 * Registers the `core/comment-reply-link` block on the server.

 */

function register_block_core_comment_reply_link() {

	register_block_type_from_metadata(

		__DIR__ . '/comment-reply-link',

		array(

			'render_callback' => 'render_block_core_comment_reply_link',

		)

	);

}

add_action( 'init', 'register_block_core_comment_reply_link' );