import { describe, expect, test } from 'vitest';
import { hoursToRanges, rangesToHours, isTimezone } from './availability';

describe('availability', () => {
	test('round trips split windows and midnight', () => {
		const hours = [0, 1, 9, 10, 18, 19, 20, 22, 23];
		expect(rangesToHours(hoursToRanges(hours))).toEqual(hours);
	});
	test('supports an overnight range and deduplicates overlaps', () => {
		expect(
			rangesToHours([
				{ start: '22:00', end: '02:00' },
				{ start: '23:00', end: '01:00' }
			])
		).toEqual([0, 1, 22, 23]);
	});
	test('no ranges means no preference', () => {
		expect(rangesToHours([])).toEqual([]);
	});
	test('rejects malformed times and ambiguous full-day ranges', () => {
		for (const start of ['18:30', '24:00', '-1:00', 'abc', '18:00'])
			expect(() => rangesToHours([{ start, end: '18:00' }])).toThrow();
	});
	test('validates IANA time zones', () => {
		expect(isTimezone('Europe/Amsterdam')).toBe(true);
		expect(isTimezone('UTC')).toBe(true);
		expect(isTimezone('Mars/Olympus')).toBe(false);
	});
});