/
    public static function productsUseGlobalUniqueId() {
        global $wpdb;
        $result = $wpdb->get_var( "\n\t\t\t\tSELECT COUNT(*)\n\t\t\t\tFROM {$wpdb->posts} as posts\n\t\t\t\tINNER JOIN {$wpdb->wc_product_meta_lookup} AS lookup ON posts.ID = lookup.product_id\n\t\t\t\tWHERE\n\t\t\t\tposts.post_type IN ( 'product', 'product_variation' )\n\t\t\t\tAND posts.post_status != 'trash'\n\t\t\t\tAND lookup.global_unique_id <> ''\n\t\t\t\t" );
        return intval( $result ) > 0;
    }

    /**
     * Get BCP 47 language code
     *
     * This is used in speech recognition: https://developer.mozilla.org/en-US/docs/Web/API/SpeechRecognition/lang
     * List of BCP 47 language codes: https://learn.microsoft.com/en-us/openspecs/office_standards/ms-oe376/6c085406-a698-4e12-9d4d-c3b0ee3dbc4a
     */
    public static function getBCP47LangCode( $language ) {
        $bcp47Map = [
            'en' => 'en-US',
            'de' => 'de-DE',
            'fr' => 'fr-FR',
            'es' => 'es-ES',
            'it' => 'it-IT',
            'pt' => 'pt-PT',
            'pl' => 'pl-PL',
            'ru' => 'ru-RU',
            'nl' => 'nl-NL',
            'sv' => 'sv-SE',
            'tr' => 'tr-TR',
            'ar' => 'ar-SA',
            'ja' => 'ja-JP',
            'cs' => 'cs-CZ',
            'da' => 'da-DK',
            'fi' => 'fi-FI',
            'no' => 'no-NO',
            'fa' => 'fa-IR',
            'el' => 'el-GR',
            'vi' => 'vi-VN',
            'hu' => 'hu-HU',
            'uk' => 'uk-UA',
        ];
        if ( isset( $bcp47Map[$language] ) ) {
            return $bcp47Map[$language];
        }
        return str_replace( '_', '-', $language );
    }

    /**
     * Calculates the Levenshtein distance for multibyte (UTF-8) strings.
     *
     * @param string $s1
     * @param string $s2
     * @return int
     */
    public static function levenshteinUtf8( $s1, $s2 ) {
        $charMap = [];
        $s1 = self::utf8ToExtendedAscii( $s1, $charMap );
        $s2 = self::utf8ToExtendedAscii( $s2, $charMap );
        return levenshtein( $s1, $s2 );
    }

    /**
     * Check if "nofibosearch" mode is active
     *
     * @return bool
     */
    public static function isNoFiboSearchModeActive() {
        return isset( $_GET['nofibosearch'] ) && $_GET['nofibosearch'] === '1' || apply_filters( 'dgwt/wcas/nofibosearch', '' ) === '1';
    }

    /**
     * Check if FiboDebug mode is enabled for a specific key
     *
     * @param string $key
     *
     * @return bool
     */
    public static function isFiboDebugEnabled( string $key ) : bool {
        // phpcs:disable WordPress.Security.NonceVerification.Recommended
        if ( !isset( $_GET['fibodebug'] ) ) {
            return false;
        }
        $debugFlags = array_map( 'trim', explode( ',', $_GET['fibodebug'] ) );
        //phpcs:enable
        return in_array( $key, $debugFlags, true );
    }

    /**
     * Maybe enable FiboDebug mode for a specific debug key (e.g. 'score', 'nofuzzy').
     *
     * This will add a hidden input field to the search form and a custom parameter to search requests.
     */
    public static function maybeInjectFiboDebugFields( string $key ) : void {
        if ( !self::isFiboDebugEnabled( $key ) ) {
            return;
        }
        // phpcs:disable WordPress.Security.NonceVerification.Recommended
        add_action( 'dgwt/wcas/form', function () {
            printf( '<input type="hidden" name="fibodebug" value="%s"/>', esc_attr( $_GET['fibodebug'] ) );
        } );
        add_filter( 'dgwt/wcas/search_bar/custom_params', function ( $params ) {
            $params['fibodebug'] = $_GET['fibodebug'];
            return $params;
        } );
        // phpcs:enable
    }

    /**
     * Converts multibyte characters to single-byte for use in levenshtein().
     *
     * @param string $str
     * @param array  $map
     * @return string
     */
    private static function utf8ToExtendedAscii( $str, &$map ) {
        if ( !preg_match_all( '/[\\xC0-\\xF7][\\x80-\\xBF]+/', $str, $matches ) ) {
            return $str;
        }
        foreach ( $matches[0] as $mbc ) {
            if ( !isset( $map[$mbc] ) ) {
                $map[$mbc] = chr( 128 + count( $map ) );
            }
        }
        return strtr( $str, $map );
    }

}