<?php
/**
 * Server-side rendering of the `core/comment-reply-link` block.
 *
 * @package WordPress
 */

/**
 * Renders the `core/comment-reply-link` block on the server.
 *
 * @since 6.0.0
 *
 * @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 = array();
    if ( isset( $attributes['textAlign'] ) ) {
        $classes[] = 'has-text-align-' . $attributes['textAlign'];
    }
    if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {
        $classes[] = 'has-link-color';
    }

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

    return sprintf(
        '<div %1$s>%2$s</div>',
        $wrapper_attributes,
        $comment_reply_link
    );
}

/**
 * Registers the `core/comment-reply-link` block on the server.
 *
 * @since 6.0.0
 */
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' );