import { assertEquals } from "https://deno.land/[email protected]/testing/asserts.ts";

import { minitz } from "../../../src/minitz.js";

import type { TimePoint } from "../../../src/minitz.js";

Deno.test("Convert to different timezone and back", function () {

const sourceUTCDate = new Date(Date.UTC(2022, 0, 1, 0, 0, 0)),

dateInNewYork = minitz.toTZ(sourceUTCDate, "America/New_York");

const backToUTC = minitz.fromTZ(dateInNewYork);

// Source date equal

assertEquals(sourceUTCDate.getTime(), backToUTC.getTime());

});

Deno.test("Timezone conversion using fromTZISO including negative offset and milliseconds", function () {

const timeInHelsinki = minitz.fromTZISO("2022-09-23T13:52:34.123-03:00", "America/Belem");

assertEquals(

timeInHelsinki.toLocaleString("sv-SE", { timeZone: "Europe/Stockholm" }),

"2022-09-23 18:52:34",

);

});

Deno.test("Test DST transition", function () {

const localVsRemote = function (local: TimePoint, remote: TimePoint) {

const timeInLocal = minitz.fromTZ(local),

timeInRemote = minitz.fromTZ(remote);

assertEquals(timeInLocal.getTime(), timeInRemote.getTime());

};

localVsRemote(

minitz.tp(2022, 3, 13, 6, 8, 9, "Europe/Stockholm"),

minitz.tp(2022, 3, 13, 0, 8, 9, "America/New_York"),

);

localVsRemote(

minitz.tp(2022, 3, 13, 7, 8, 9, "Europe/Stockholm"),

minitz.tp(2022, 3, 13, 1, 8, 9, "America/New_York"),

);

localVsRemote(

minitz.tp(2022, 3, 13, 8, 8, 9, "Europe/Stockholm"),

minitz.tp(2022, 3, 13, 3, 8, 9, "America/New_York"),

); // <-- New york DST transition 02:00 -> 03:00

localVsRemote(

minitz.tp(2022, 3, 13, 9, 8, 9, "Europe/Stockholm"),

minitz.tp(2022, 3, 13, 4, 8, 9, "America/New_York"),

);

localVsRemote(

minitz.tp(2022, 3, 13, 10, 8, 9, "Europe/Stockholm"),

minitz.tp(2022, 3, 13, 5, 8, 9, "America/New_York"),

);

});