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

/**
 * Renders the `core/site-title` block on the server.
 *
 * @since 5.8.0
 *
 * @param array $attributes The block attributes.
 *
 * @return string The render.
 */
function render_block_core_site_title( $attributes ) {
    $site_title = get_bloginfo( 'name' );
    if ( ! trim( $site_title ) ) {
        return '';
    }

    $tag_name = 'h1';
    $classes  = empty( $attributes['textAlign'] ) ? '' : "has-text-align-{$attributes['textAlign']}";
    if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {
        $classes .= ' has-link-color';
    }

    if ( isset( $attributes['level'] ) ) {
        $tag_name = 0 === $attributes['level'] ? 'p' : 'h' . (int) $attributes['level'];
    }

    if ( $attributes['isLink'] ) {
        $aria_current = ! is_paged() && ( is_front_page() || is_home() && ( (int) get_option( 'page_for_posts' ) !== get_queried_object_id() ) ) ? ' aria-current="page"' : '';
        $link_target  = ! empty( $attributes['linkTarget'] ) ? $attributes['linkTarget'] : '_self';

        $site_title = sprintf(
            '<a href="%1$s" target="%2$s" rel="home"%3$s>%4$s</a>',
            esc_url( home_url() ),
            esc_attr( $link_target ),
            $aria_current,
            esc_html( $site_title )
        );
    }
    $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => trim( $classes ) ) );

    return sprintf(
        '<%1$s %2$s>%3$s</%1$s>',
        $tag_name,
        $wrapper_attributes,
        // already pre-escaped if it is a link.
        $attributes['isLink'] ? $site_title : esc_html( $site_title )
    );
}

/**
 * Registers the `core/site-title` block on the server.
 *
 * @since 5.8.0
 */
function register_block_core_site_title() {
    register_block_type_from_metadata(
        __DIR__ . '/site-title',
        array(
            'render_callback' => 'render_block_core_site_title',
        )
    );
}
add_action( 'init', 'register_block_core_site_title' );