import { CanonicalizeUnicodeLocaleId } from "./CanonicalizeUnicodeLocaleId.js";
import { invariant } from "./utils.js";
export function InsertUnicodeExtensionAndCanonicalize(locale, attributes, keywords) {
	invariant(locale.indexOf("-u-") === -1, "Expected locale to not have a Unicode locale extension");
	let extension = "-u";
	for (const attr of attributes) {
		extension += `-${attr}`;
	}
	for (const kw of keywords) {
		const { key, value } = kw;
		extension += `-${key}`;
		if (value !== "") {
			extension += `-${value}`;
		}
	}
	if (extension === "-u") {
		return CanonicalizeUnicodeLocaleId(locale);
	}
	let privateIndex = locale.indexOf("-x-");
	let newLocale;
	if (privateIndex === -1) {
		newLocale = locale + extension;
	} else {
		let preExtension = locale.slice(0, privateIndex);
		let postExtension = locale.slice(privateIndex);
		newLocale = preExtension + extension + postExtension;
	}
	return CanonicalizeUnicodeLocaleId(newLocale);
}