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/**
* @private
*/
import Zone from "../zone.js";
import IANAZone from "../zones/IANAZone.js";
import FixedOffsetZone from "../zones/fixedOffsetZone.js";
import InvalidZone from "../zones/invalidZone.js";
import { isUndefined, isString, isNumber } from "./util.js";
import SystemZone from "../zones/systemZone.js";
export function normalizeZone(input, defaultZone) {
let offset;
if (isUndefined(input) || input === null) {
return defaultZone;
} else if (input instanceof Zone) {
return input;
} else if (isString(input)) {
const lowered = input.toLowerCase();
if (lowered === "default") return defaultZone;
else if (lowered === "local" || lowered === "system") return SystemZone.instance;
else if (lowered === "utc" || lowered === "gmt") return FixedOffsetZone.utcInstance;
else return FixedOffsetZone.parseSpecifier(lowered) || IANAZone.create(input);
} else if (isNumber(input)) {
return FixedOffsetZone.instance(input);
} else if (typeof input === "object" && "offset" in input && typeof input.offset === "function") {
// This is dumb, but the instanceof check above doesn't seem to really work
// so we're duck checking it
return input;
} else {
return new InvalidZone(input);
}
}