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

/**
 * Renders the `core/post-comments-link` block on the server.
 *
 * @since 6.9.0
 *
 * @param  array    $attributes Block attributes.
 * @param  string   $content    Block default content.
 * @param  WP_Block $block      Block instance.
 * @return string   Returns the rendered link.
 */
function render_block_core_post_comments_link( $attributes, $content, $block ) {
    if (
        ! isset( $block->context['postId'] ) ||
        isset( $block->context['postId'] ) &&
        ! comments_open( $block->context['postId'] )
    ) {
        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 ) ) );
    $comments_number    = (int) get_comments_number( $block->context['postId'] );
    $comments_link      = get_comments_link( $block->context['postId'] );
    $post_title         = get_the_title( $block->context['postId'] );
    $comment_html       = '';

    if ( 0 === $comments_number ) {
        $comment_html = sprintf(
            /* translators: %s post title */
            __( 'No comments<span class="screen-reader-text"> on %s</span>' ),
            $post_title
        );
    } else {
        $comment_html = sprintf(
            /* translators: 1: Number of comments, 2: post title */
            _n(
                '%1$s comment<span class="screen-reader-text"> on %2$s</span>',
                '%1$s comments<span class="screen-reader-text"> on %2$s</span>',
                $comments_number
            ),
            esc_html( number_format_i18n( $comments_number ) ),
            $post_title
        );
    }

    return '<div ' . $wrapper_attributes . '><a href=' . esc_url( $comments_link ) . '>' . $comment_html . '</a></div>';
}

/**
 * Registers the `core/post-comments-link` block on the server.
 *
 * @since 6.9.0
 */
function register_block_core_post_comments_link() {
    register_block_type_from_metadata(
        __DIR__ . '/post-comments-link',
        array(
            'render_callback' => 'render_block_core_post_comments_link',
        )
    );
}
add_action( 'init', 'register_block_core_post_comments_link' );