import { BestAvailableLocale } from "./BestAvailableLocale.js";
import { UNICODE_EXTENSION_SEQUENCE_REGEX } from "./utils.js";
/**
* https://tc39.es/ecma402/#sec-lookupmatcher
* @param availableLocales
* @param requestedLocales
* @param getDefaultLocale
*/
export function LookupMatcher(availableLocales, requestedLocales, getDefaultLocale) {
	const result = { locale: "" };
	for (const locale of requestedLocales) {
		const noExtensionLocale = locale.replace(UNICODE_EXTENSION_SEQUENCE_REGEX, "");
		const availableLocale = BestAvailableLocale(availableLocales, noExtensionLocale);
		if (availableLocale) {
			result.locale = availableLocale;
			if (locale !== noExtensionLocale) {
				result.extension = locale.slice(noExtensionLocale.length, locale.length);
			}
			return result;
		}
	}
	result.locale = getDefaultLocale();
	return result;
}