import { UNICODE_EXTENSION_SEQUENCE_REGEX } from './utils';
import { BestAvailableLocale } from './BestAvailableLocale';
/**
 * https://tc39.es/ecma402/#sec-lookupmatcher
 * @param availableLocales
 * @param requestedLocales
 * @param getDefaultLocale
 */
export function LookupMatcher(availableLocales, requestedLocales, getDefaultLocale) {
    var result = { locale: '' };
    for (var _i = 0, requestedLocales_1 = requestedLocales; _i < requestedLocales_1.length; _i++) {
        var locale = requestedLocales_1[_i];
        var noExtensionLocale = locale.replace(UNICODE_EXTENSION_SEQUENCE_REGEX, '');
        var availableLocale = BestAvailableLocale(availableLocales, noExtensionLocale);
        if (availableLocale) {
            result.locale = availableLocale;
            if (locale !== noExtensionLocale) {
                result.extension = locale.slice(noExtensionLocale.length + 1, locale.length);
            }
            return result;
        }
    }
    result.locale = getDefaultLocale();
    return result;
}