<?php
/**
 * Server-side rendering of the `core/comments-title` block.
 *
 * @package WordPress
 */

/**
 * Renders the `core/comments-title` block on the server.
 *
 * @since 6.0.0
 *
 * @param array $attributes Block attributes.
 *
 * @return string Return the post comments title.
 */
function render_block_core_comments_title( $attributes ) {

    if ( post_password_required() ) {
        return;
    }

    $align_class_name    = empty( $attributes['textAlign'] ) ? '' : "has-text-align-{$attributes['textAlign']}";
    $show_post_title     = ! empty( $attributes['showPostTitle'] ) && $attributes['showPostTitle'];
    $show_comments_count = ! empty( $attributes['showCommentsCount'] ) && $attributes['showCommentsCount'];
    $wrapper_attributes  = get_block_wrapper_attributes( array( 'class' => $align_class_name ) );
    $comments_count      = get_comments_number();
    $post_title          = get_the_title();
    $tag_name            = 'h2';
    if ( isset( $attributes['level'] ) ) {
        $tag_name = 'h' . $attributes['level'];
    }

    if ( '0' === $comments_count ) {
        return;
    }

    if ( $show_comments_count ) {
        if ( $show_post_title ) {
            if ( '1' === $comments_count ) {
                /* translators: %s: Post title. */
                $comments_title = sprintf( __( 'One response to &#8220;%s&#8221;' ), $post_title );
            } else {
                $comments_title = sprintf(
                    /* translators: 1: Number of comments, 2: Post title. */
                    _n(
                        '%1$s response to &#8220;%2$s&#8221;',
                        '%1$s responses to &#8220;%2$s&#8221;',
                        $comments_count
                    ),
                    number_format_i18n( $comments_count ),
                    $post_title
                );
            }
        } elseif ( '1' === $comments_count ) {
            $comments_title = __( 'One response' );
        } else {
            $comments_title = sprintf(
                /* translators: %s: Number of comments. */
                _n( '%s response', '%s responses', $comments_count ),
                number_format_i18n( $comments_count )
            );
        }
    } elseif ( $show_post_title ) {
        if ( '1' === $comments_count ) {
            /* translators: %s: Post title. */
            $comments_title = sprintf( __( 'Response to &#8220;%s&#8221;' ), $post_title );
        } else {
            /* translators: %s: Post title. */
            $comments_title = sprintf( __( 'Responses to &#8220;%s&#8221;' ), $post_title );
        }
    } elseif ( '1' === $comments_count ) {
        $comments_title = __( 'Response' );
    } else {
        $comments_title = __( 'Responses' );
    }

    return sprintf(
        '<%1$s id="comments" %2$s>%3$s</%1$s>',
        $tag_name,
        $wrapper_attributes,
        $comments_title
    );
}

/**
 * Registers the `core/comments-title` block on the server.
 *
 * @since 6.0.0
 */
function register_block_core_comments_title() {
    register_block_type_from_metadata(
        __DIR__ . '/comments-title',
        array(
            'render_callback' => 'render_block_core_comments_title',
        )
    );
}

add_action( 'init', 'register_block_core_comments_title' );