import { describe, expect, it } from "vitest";
import { isQuietMinute, isQuietTime, localDateAndMinute } from "./quiet-hours.js";

const minute = (clock: string) => {
  const [hour, min] = clock.split(":").map(Number);
  return hour! * 60 + min!;
};

describe("quiet hours", () => {
  it("covers a same-day range with an inclusive start and an exclusive end", () => {
    const lunch = { start: minute("12:00"), end: minute("13:30") };
    expect(isQuietMinute(lunch, minute("11:59"))).toBe(false);
    expect(isQuietMinute(lunch, minute("12:00"))).toBe(true);
    expect(isQuietMinute(lunch, minute("13:29"))).toBe(true);
    expect(isQuietMinute(lunch, minute("13:30"))).toBe(false);
  });

  it("covers a range that crosses midnight", () => {
    const night = { start: minute("22:00"), end: minute("07:00") };
    expect(isQuietMinute(night, minute("21:59"))).toBe(false);
    expect(isQuietMinute(night, minute("22:00"))).toBe(true);
    expect(isQuietMinute(night, minute("23:59"))).toBe(true);
    expect(isQuietMinute(night, minute("00:00"))).toBe(true);
    expect(isQuietMinute(night, minute("06:59"))).toBe(true);
    expect(isQuietMinute(night, minute("07:00"))).toBe(false);
    expect(isQuietMinute(night, minute("12:00"))).toBe(false);
  });

  it("is never quiet without a range or with an empty one", () => {
    expect(isQuietMinute(null, minute("03:00"))).toBe(false);
    expect(isQuietMinute({ start: 300, end: 300 }, 300)).toBe(false);
  });

  it("reads the wall clock in the user's time zone", () => {
    // 21:30 UTC is 23:30 in Vienna (CEST, UTC+2) and 14:30 in Los Angeles (PDT, UTC-7).
    const now = new Date("2026-07-01T21:30:00Z");
    const night = { start: minute("22:00"), end: minute("07:00") };
    expect(isQuietTime(night, "Europe/Vienna", now)).toBe(true);
    expect(isQuietTime(night, "America/Los_Angeles", now)).toBe(false);
    expect(isQuietTime(night, null, now)).toBe(false);
  });

  it("falls back to UTC for an unknown zone and reports the local date", () => {
    const now = new Date("2026-01-31T23:15:00Z");
    expect(localDateAndMinute(now, "Not/AZone")).toEqual({
      date: "2026-01-31",
      minute: minute("23:15"),
    });
    // Already the next day in Tokyo (UTC+9).
    expect(localDateAndMinute(now, "Asia/Tokyo")).toEqual({
      date: "2026-02-01",
      minute: minute("08:15"),
    });
  });

  it("follows daylight saving changes", () => {
    const night = { start: minute("22:00"), end: minute("07:00") };
    // 05:30 UTC is 06:30 in Vienna in winter (CET) and 07:30 in summer (CEST).
    expect(isQuietTime(night, "Europe/Vienna", new Date("2026-01-15T05:30:00Z"))).toBe(true);
    expect(isQuietTime(night, "Europe/Vienna", new Date("2026-07-15T05:30:00Z"))).toBe(false);
  });
});