import type { MockInstance } from 'vitest';

import { getInitials } from './labelUtil';

describe('labelUtil.getInitials', () => {
	it.each([
		['', ''],

		// simple words
		['Hello', 'He'],
		['Hello World', 'HW'],
		['H', 'H'],

		// multiple spaces
		['Double  Space', 'DS'],
		['        ', ''],

		// simple emoji
		['👋 Hello', '👋H'],
		['👋Hello', '👋H'],
		['Hello 👋', 'H👋'],
		['Hello👋', 'He'],

		// combined emojis
		['1️⃣ 1️⃣', '1️⃣1️⃣'],
		['1️⃣', '1️⃣'],
		['👩‍⚕️D 👩‍⚕️D', '👩‍⚕️👩‍⚕️'],
	])('turns "%s" into "%s"', (input, output) => {
		expect(getInitials(input)).toBe(output);
	});

	describe('when Intl.Segmenter is not supported', () => {
		let intlSpy: MockInstance;

		beforeEach(() => {
			// No Intl.Segmenter support
			intlSpy = vi.spyOn(globalThis, 'Intl', 'get');
			intlSpy.mockImplementation(() => ({}));
		});

		it.each([
			['', ''],

			// simple words
			['Hello', 'He'],
			['Hello World', 'HW'],
			['H', 'H'],

			// multiple spaces
			['Double  Space', 'DS'],
			['        ', ''],
		])('turns "%s" into "%s"', (input, output) => {
			expect(getInitials(input)).toBe(output);
		});
	});
});