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

/**
 * Get the post title.
 *
 * The post title is fetched and if it is blank then a default string is
 * returned.
 *
 * Copied from `wp-admin/includes/template.php`, but we can't include that
 * file because:
 *
 * 1. It causes bugs with test fixture generation and strange Docker 255 error
 *    codes.
 * 2. It's in the admin; ideally we *shouldn't* be including files from the
 *    admin for a block's output. It's a very small/simple function as well,
 *    so duplicating it isn't too terrible.
 *
 * @since 3.3.0
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return string The post title if set; "(no title)" if no title is set.
 */
function wp_latest_comments_draft_or_post_title( $post = 0 ) {
    $title = get_the_title( $post );
    if ( empty( $title ) ) {
        $title = __( '(no title)' );
    }
    return $title;
}

/**
 * Renders the `core/latest-comments` block on server.
 *
 * @since 5.1.0
 *
 * @param array $attributes The block attributes.
 *
 * @return string Returns the post content with latest comments added.
 */
function render_block_core_latest_comments( $attributes ) {
    // Handle backward compatibility: check for old displayExcerpt attribute
    if ( isset( $attributes['displayExcerpt'] ) ) {
        $display_content = $attributes['displayExcerpt'] ? 'excerpt' : 'none';
    } else {
        $display_content = $attributes['displayContent'] ?? 'excerpt';
    }

    $comments = get_comments(
        /** This filter is documented in wp-includes/widgets/class-wp-widget-recent-comments.php */
        apply_filters(
            'widget_comments_args',
            array(
                'number'      => $attributes['commentsToShow'],
                'status'      => 'approve',
                'post_status' => 'publish',
            ),
            array()
        )
    );

    $list_items_markup = '';
    if ( ! empty( $comments ) ) {
        // Prime the cache for associated posts. This is copied from \WP_Widget_Recent_Comments::widget().
        $post_ids = array_unique( wp_list_pluck( $comments, 'comment_post_ID' ) );
        _prime_post_caches( $post_ids, strpos( get_option( 'permalink_structure' ), '%category%' ), false );

        foreach ( $comments as $comment ) {
            $list_items_markup .= '<li class="wp-block-latest-comments__comment">';
            if ( $attributes['displayAvatar'] ) {
                $avatar = get_avatar(
                    $comment,
                    48,
                    '',
                    '',
                    array(
                        'class' => 'wp-block-latest-comments__comment-avatar',
                    )
                );
                if ( $avatar ) {
                    $list_items_markup .= $avatar;
                }
            }

            $list_items_markup .= '<article>';
            $list_items_markup .= '<footer class="wp-block-latest-comments__comment-meta">';
            $author_url         = get_comment_author_url( $comment );
            if ( empty( $author_url ) && ! empty( $comment->user_id ) ) {
                $author_url = get_author_posts_url( $comment->user_id );
            }

            $author_markup = '';
            if ( $author_url ) {
                $author_markup .= '<a class="wp-block-latest-comments__comment-author" href="' . esc_url( $author_url ) . '">' . get_comment_author( $comment ) . '</a>';
            } else {
                $author_markup .= '<span class="wp-block-latest-comments__comment-author">' . get_comment_author( $comment ) . '</span>';
            }

            // `_draft_or_post_title` calls `esc_html()` so we don't need to wrap that call in
            // `esc_html`.
            $post_title = '<a class="wp-block-latest-comments__comment-link" href="' . esc_url( get_comment_link( $comment ) ) . '">' . wp_latest_comments_draft_or_post_title( $comment->comment_post_ID ) . '</a>';

            $list_items_markup .= sprintf(
                /* translators: 1: author name (inside <a> or <span> tag, based on if they have a URL), 2: post title related to this comment */
                __( '%1$s on %2$s' ),
                $author_markup,
                $post_title
            );

            if ( $attributes['displayDate'] ) {
                $list_items_markup .= sprintf(
                    '<time datetime="%1$s" class="wp-block-latest-comments__comment-date">%2$s</time>',
                    esc_attr( get_comment_date( 'c', $comment ) ),
                    date_i18n( get_option( 'date_format' ), get_comment_date( 'U', $comment ) )
                );
            }
            $list_items_markup .= '</footer>';
            if ( 'full' === $display_content ) {
                $list_items_markup .= '<div class="wp-block-latest-comments__comment-excerpt">' . wpautop( get_comment_text( $comment ) ) . '</div>';
            } elseif ( 'excerpt' === $display_content ) {
                $list_items_markup .= '<div class="wp-block-latest-comments__comment-excerpt">' . wpautop( get_comment_excerpt( $comment ) ) . '</div>';
            }
            $list_items_markup .= '</article></li>';
        }
    }

    $classnames = array();
    if ( $attributes['displayAvatar'] ) {
        $classnames[] = 'has-avatars';
    }
    if ( $attributes['displayDate'] ) {
        $classnames[] = 'has-dates';
    }
    if ( 'none' !== $display_content ) {
        $classnames[] = 'has-excerpts';
    }
    if ( empty( $comments ) ) {
        $classnames[] = 'no-comments';
    }
    $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classnames ) ) );

    return ! empty( $comments ) ? sprintf(
        '<ol %1$s>%2$s</ol>',
        $wrapper_attributes,
        $list_items_markup
    ) : sprintf(
        '<div %1$s>%2$s</div>',
        $wrapper_attributes,
        __( 'No comments to show.' )
    );
}

/**
 * Registers the `core/latest-comments` block.
 *
 * @since 5.3.0
 */
function register_block_core_latest_comments() {
    register_block_type_from_metadata(
        __DIR__ . '/latest-comments',
        array(
            'render_callback' => 'render_block_core_latest_comments',
        )
    );
}

add_action( 'init', 'register_block_core_latest_comments' );