import { expect } from "chai";
import { pipe } from "effect";
import * as Either from "effect/Either";
import assert from "node:assert";
import { describe, it } from "node:test";
import { iso8601ToDate } from "./Date.js";
import { failWith } from "./Function.js";

describe("iso8601ToDate", () => {
  it("should encode to exactly the same string as date.toISOString", () => {
    const date = new Date();
    assert.equal(
      pipe(iso8601ToDate.encode(date), Either.getOrElse(failWith)),
      date.toISOString(),
    );
  });

  it("should decode from an iso string", () => {
    expect(
      pipe(
        iso8601ToDate.decode("2024-10-10T23:00:00.000Z"),
        Either.getOrElse(failWith),
      ),
    ).to.deep.eq(new Date("2024-10-10T23:00:00.000Z"));
  });

  it("should not change local time", () => {
    expect(
      pipe(
        iso8601ToDate.decode("2024-01-01T12:00"),
        Either.getOrElse(failWith),
      ).toISOString(),
    ).to.eq("2024-01-01T11:00:00.000Z");
  });

  it("should decode strings without time component to local time", () => {
    expect(
      pipe(
        iso8601ToDate.decode("2024-01-01"),
        Either.getOrElse(failWith),
      ).toISOString(),
    ).to.eq("2023-12-31T23:00:00.000Z");
  });
});