import { TimerManager } from '../../../src';

describe('TimerManager', () => {
	afterEach(() => {
		jest.clearAllTimers();
		TimerManager.destroy();
	});

	test('GIVEN "new" THEN  throws error', () => {
		expect(() => new TimerManager()).toThrowError('Super constructor null of TimerManager is not a constructor');
	});

	test('GIVEN setTimeout static THEN creates and resolves timeout', (done) => {
		expect.assertions(2);

		expect(TimerManager['storedTimeouts'].size).toBe(0);

		TimerManager.setTimeout(() => {
			expect(true).toBeTruthy();
			done();
		}, 20);
	});

	test('GIVEN setTimeout with clear THEN creates but clears timeout', () => {
		expect.assertions(3);

		expect(TimerManager['storedTimeouts'].size).toBe(0);

		const timer = TimerManager.setTimeout(() => {
			fail('Woops, the TimerManager got into the timeout');
		}, 20_000);

		expect(TimerManager['storedTimeouts'].size).toBe(1);

		TimerManager.clearTimeout(timer);

		expect(TimerManager['storedTimeouts'].size).toBe(0);
	});

	test('GIVEN setInterval static THEN resolves given amount of times', (done) => {
		expect.assertions(4);

		expect(TimerManager['storedIntervals'].size).toBe(0);

		let i = 0;
		const interval = TimerManager.setInterval(() => {
			if (++i < 3) {
				expect(TimerManager['storedIntervals'].size).toBe(1);
			} else {
				TimerManager.clearInterval(interval);
				expect(TimerManager['storedIntervals'].size).toBe(0);
				done();
			}
		}, 20);
	});

	test('GIVEN timer+interval->destroy THEN removes all', () => {
		expect.assertions(8);

		expect(TimerManager['storedTimeouts'].size).toBe(0);
		expect(TimerManager['storedIntervals'].size).toBe(0);

		TimerManager.setTimeout(() => {
			fail('Woops, the TimerManager got into the timeout');
		}, 20_000);

		expect(TimerManager['storedTimeouts'].size).toBe(1);
		expect(TimerManager['storedIntervals'].size).toBe(0);

		TimerManager.setInterval(() => {
			fail('Woops, the TimerManager got into the interval');
		}, 20_000);

		expect(TimerManager['storedTimeouts'].size).toBe(1);
		expect(TimerManager['storedIntervals'].size).toBe(1);

		TimerManager.destroy();

		expect(TimerManager['storedTimeouts'].size).toBe(0);
		expect(TimerManager['storedIntervals'].size).toBe(0);
	});
});