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

/**
 * Renders the `core/site-logo` block on the server.
 *
 * @since 5.8.0
 *
 * @param array $attributes The block attributes.
 *
 * @return string The render.
 */
function render_block_core_site_logo( $attributes ) {
    $adjust_width_height_filter = static function ( $image ) use ( $attributes ) {
        if ( empty( $attributes['width'] ) || empty( $image ) || ! $image[1] || ! $image[2] ) {
            return $image;
        }
        $height = (float) $attributes['width'] / ( (float) $image[1] / (float) $image[2] );
        return array( $image[0], (int) $attributes['width'], (int) $height );
    };

    add_filter( 'wp_get_attachment_image_src', $adjust_width_height_filter );

    $custom_logo = get_custom_logo();

    remove_filter( 'wp_get_attachment_image_src', $adjust_width_height_filter );

    if ( empty( $custom_logo ) ) {
        return ''; // Return early if no custom logo is set, avoiding extraneous wrapper div.
    }

    if ( ! $attributes['isLink'] ) {
        // Remove the link.
        $custom_logo = preg_replace( '#<a.*?>(.*?)</a>#i', '\1', $custom_logo );
    }

    if ( $attributes['isLink'] && '_blank' === $attributes['linkTarget'] ) {
        // Add the link target after the rel="home".
        // Add an aria-label for informing that the page opens in a new tab.
        $processor = new WP_HTML_Tag_Processor( $custom_logo );
        $processor->next_tag( 'a' );
        if ( 'home' === $processor->get_attribute( 'rel' ) ) {
            $processor->set_attribute( 'aria-label', __( '(Home link, opens in a new tab)' ) );
            $processor->set_attribute( 'target', $attributes['linkTarget'] );
        }
        $custom_logo = $processor->get_updated_html();
    }

    $classnames = array();
    if ( empty( $attributes['width'] ) ) {
        $classnames[] = 'is-default-size';
    }

    $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classnames ) ) );
    $html               = sprintf( '<div %s>%s</div>', $wrapper_attributes, $custom_logo );
    return $html;
}

/**
 * Register a core site setting for a site logo
 *
 * @since 5.8.0
 */
function register_block_core_site_logo_setting() {
    register_setting(
        'general',
        'site_logo',
        array(
            'show_in_rest' => array(
                'name' => 'site_logo',
            ),
            'type'         => 'integer',
            'label'        => __( 'Logo' ),
            'description'  => __( 'Site logo.' ),
        )
    );
}

add_action( 'rest_api_init', 'register_block_core_site_logo_setting', 10 );

/**
 * Register a core site setting for a site icon
 *
 * @since 5.9.0
 */
function register_block_core_site_icon_setting() {
    register_setting(
        'general',
        'site_icon',
        array(
            'show_in_rest' => true,
            'type'         => 'integer',
            'label'        => __( 'Icon' ),
            'description'  => __( 'Site icon.' ),
        )
    );
}

add_action( 'rest_api_init', 'register_block_core_site_icon_setting', 10 );

/**
 * Registers the `core/site-logo` block on the server.
 *
 * @since 5.8.0
 */
function register_block_core_site_logo() {
    register_block_type_from_metadata(
        __DIR__ . '/site-logo',
        array(
            'render_callback' => 'render_block_core_site_logo',
        )
    );
}

add_action( 'init', 'register_block_core_site_logo' );

/**
 * Overrides the custom logo with a site logo, if the option is set.
 *
 * @since 5.8.0
 *
 * @param string $custom_logo The custom logo set by a theme.
 *
 * @return string The site logo if set.
 */
function _override_custom_logo_theme_mod( $custom_logo ) {
    $site_logo = get_option( 'site_logo' );
    return false === $site_logo ? $custom_logo : $site_logo;
}

add_filter( 'theme_mod_custom_logo', '_override_custom_logo_theme_mod' );

/**
 * Updates the site_logo option when the custom_logo theme-mod gets updated.
 *
 * @since 5.8.0
 *
 * @param  mixed $value Attachment ID of the custom logo or an empty value.
 * @return mixed
 */
function _sync_custom_logo_to_site_logo( $value ) {
    if ( empty( $value ) ) {
        delete_option( 'site_logo' );
    } else {
        update_option( 'site_logo', $value );
    }

    return $value;
}

add_filter( 'pre_set_theme_mod_custom_logo', '_sync_custom_logo_to_site_logo' );

/**
 * Deletes the site_logo when the custom_logo theme mod is removed.
 *
 * @since 5.8.0
 *
 * @global array $_ignore_site_logo_changes
 *
 * @param array $old_value Previous theme mod settings.
 * @param array $value     Updated theme mod settings.
 */
function _delete_site_logo_on_remove_custom_logo( $old_value, $value ) {
    global $_ignore_site_logo_changes;

    if ( $_ignore_site_logo_changes ) {
        return;
    }

    // If the custom_logo is being unset, it's being removed from theme mods.
    if ( isset( $old_value['custom_logo'] ) && ! isset( $value['custom_logo'] ) ) {
        delete_option( 'site_logo' );
    }
}

/**
 * Deletes the site logo when all theme mods are being removed.
 *
 * @since 5.8.0
 *
 * @global array $_ignore_site_logo_changes
 */
function _delete_site_logo_on_remove_theme_mods() {
    global $_ignore_site_logo_changes;

    if ( $_ignore_site_logo_changes ) {
        return;
    }

    if ( false !== get_theme_support( 'custom-logo' ) ) {
        delete_option( 'site_logo' );
    }
}

/**
 * Hooks `_delete_site_logo_on_remove_custom_logo` in `update_option_theme_mods_$theme`.
 * Hooks `_delete_site_logo_on_remove_theme_mods` in `delete_option_theme_mods_$theme`.
 *
 * Runs on `setup_theme` to account for dynamically-switched themes in the Customizer.
 *
 * @since 5.8.0
 */
function _delete_site_logo_on_remove_custom_logo_on_setup_theme() {
    $theme = get_option( 'stylesheet' );
    add_action( "update_option_theme_mods_$theme", '_delete_site_logo_on_remove_custom_logo', 10, 2 );
    add_action( "delete_option_theme_mods_$theme", '_delete_site_logo_on_remove_theme_mods' );
}
add_action( 'setup_theme', '_delete_site_logo_on_remove_custom_logo_on_setup_theme', 11 );

/**
 * Removes the custom_logo theme-mod when the site_logo option gets deleted.
 *
 * @since 5.9.0
 *
 * @global array $_ignore_site_logo_changes
 */
function _delete_custom_logo_on_remove_site_logo() {
    global $_ignore_site_logo_changes;

    // Prevent _delete_site_logo_on_remove_custom_logo and
    // _delete_site_logo_on_remove_theme_mods from firing and causing an
    // infinite loop.
    $_ignore_site_logo_changes = true;

    // Remove the custom logo.
    remove_theme_mod( 'custom_logo' );

    $_ignore_site_logo_changes = false;
}
add_action( 'delete_option_site_logo', '_delete_custom_logo_on_remove_site_logo' );