import { describe, expect, it } from 'vitest';
import { thumbnailUrl } from './thumbnails';

describe('thumbnailUrl', () => {
	it('returns null when thumbnailKey is undefined', () => {
		expect(thumbnailUrl({ id: 'abc' })).toBeNull();
	});

	it('returns url without version param when thumbnailKey present but generatedAt missing', () => {
		expect(thumbnailUrl({ id: 'abc', thumbnailKey: 'thumbnails/abc.jpg' })).toBe(
			'/api/documents/abc/thumbnail'
		);
	});

	it('appends encoded cache-bust param when generatedAt present', () => {
		const url = thumbnailUrl({
			id: 'abc',
			thumbnailKey: 'thumbnails/abc.jpg',
			thumbnailGeneratedAt: '2026-04-22T20:41:15.123456'
		});
		expect(url).toBe('/api/documents/abc/thumbnail?v=2026-04-22T20%3A41%3A15.123456');
	});

	it('different generatedAt produces different URL — enables cache-bust on file replace', () => {
		const a = thumbnailUrl({
			id: 'x',
			thumbnailKey: 'thumbnails/x.jpg',
			thumbnailGeneratedAt: '2026-01-01T10:00:00'
		});
		const b = thumbnailUrl({
			id: 'x',
			thumbnailKey: 'thumbnails/x.jpg',
			thumbnailGeneratedAt: '2026-01-01T11:00:00'
		});
		expect(a).not.toBe(b);
	});
});