import { parseIranLocalDateTime } from "./iran-datetime";

describe("parseIranLocalDateTime", () => {
  it("parses YYYY-MM-DD + HH:MM as Iran local (not server local)", () => {
    const instant = parseIranLocalDateTime("2025-05-16", "18:28");
    expect(instant).not.toBeNull();
    // 18:28 Iran = 14:58 UTC
    expect(instant!.toISOString()).toBe("2025-05-16T14:58:00.000Z");
  });

  it("parses naive ISO datetime as Iran local", () => {
    const instant = parseIranLocalDateTime("2025-05-16T18:28");
    expect(instant!.toISOString()).toBe("2025-05-16T14:58:00.000Z");
  });

  it("respects explicit UTC offset in string", () => {
    const instant = parseIranLocalDateTime("2025-05-16T14:58:00.000Z");
    expect(instant!.toISOString()).toBe("2025-05-16T14:58:00.000Z");
  });

  it("combines Date calendar day in Iran with accidentTime", () => {
    const dateOnly = new Date("2025-05-16T00:00:00.000Z");
    const instant = parseIranLocalDateTime(dateOnly, "18:28");
    expect(instant!.toISOString()).toBe("2025-05-16T14:58:00.000Z");
  });
});