import { appointmentWithinWorkingHours } from './working-hours';
import { isValidIanaTimeZone, zonedWeekdayAndMinutes } from './zoned-civil-time';

describe('zoned civil time', () => {
  it('accepts IANA zones and rejects garbage', () => {
    expect(isValidIanaTimeZone('Asia/Tehran')).toBe(true);
    expect(isValidIanaTimeZone('Europe/Amsterdam')).toBe(true);
    expect(isValidIanaTimeZone('Not/AZone')).toBe(false);
  });

  it('maps a UTC instant to Tehran wall-clock (no DST)', () => {
    // 2026-08-20 09:45 Asia/Tehran = 06:15 UTC (the production 400 case)
    const instant = new Date('2026-08-20T06:15:00.000Z');
    const zoned = zonedWeekdayAndMinutes(instant, 'Asia/Tehran');
    expect(zoned.jsWeekday).toBe(4); // Thursday
    expect(zoned.minuteOfDay).toBe(9 * 60 + 45);
  });

  it('treats morning Tehran slots as inside 08:00–17:00 hours', () => {
    const start = new Date('2026-08-20T06:15:00.000Z');
    const end = new Date('2026-08-20T06:45:00.000Z');
    expect(
      appointmentWithinWorkingHours(start, end, [{ startMinute: 8 * 60, endMinute: 17 * 60 }], 'Asia/Tehran'),
    ).toBe(true);
    expect(
      appointmentWithinWorkingHours(start, end, [{ startMinute: 8 * 60, endMinute: 17 * 60 }], 'UTC'),
    ).toBe(false);
  });
});