import { setupDatabaseAndSynchronizer, sleep, switchClient } from './testing/test-utils';
import TaskQueue from './TaskQueue';

describe('TaskQueue', () => {

	beforeEach(async () => {
		await setupDatabaseAndSynchronizer(1);
		await switchClient(1);
	});

	it('should queue and execute tasks', (async () => {
		const queue = new TaskQueue('test');

		queue.push('1', async () => { await sleep(0.5); return 'a'; });
		queue.push('2', async () => { await sleep(0.5); return 'b'; });
		queue.push('3', async () => { await sleep(0.5); return 'c'; });

		const results = [];

		results.push(await queue.waitForResult('1'));
		results.push(await queue.waitForResult('2'));
		results.push(await queue.waitForResult('3'));

		expect(results[0].id).toBe('1');
		expect(results[0].result).toBe('a');
		expect(results[1].id).toBe('2');
		expect(results[1].result).toBe('b');
		expect(results[2].id).toBe('3');
		expect(results[2].result).toBe('c');
	}));

	it('should handle errors', (async () => {
		const queue = new TaskQueue('test');

		queue.push('1', async () => { await sleep(0.5); return 'a'; });
		queue.push('2', async () => { await sleep(0.5); throw new Error('e'); });

		const results = [];

		results.push(await queue.waitForResult('1'));
		results.push(await queue.waitForResult('2'));

		expect(results[0].id).toBe('1');
		expect(results[0].result).toBe('a');
		expect(results[1].id).toBe('2');
		expect(!results[1].result).toBe(true);
		expect(results[1].error.message).toBe('e');
	}));

});