const { WorkerPortal } = require('../lib/index.js');

function FakeWorkerPair() {
	let cbA = null;
	let cbB = null;

	const objA = {
		postMessage: data => {
			cbB({ data: data });
		},
		addEventListener: (eventName, fn) => {
			cbA = (...r) => {
				fn(...r);
			};
		},
		removeEventListener: (eventName, fn) => {
			cbA = null;
		}
	};

	const objB = {
		postMessage: data => {
			cbA({ data: data });
		},
		addEventListener: (eventName, fn) => {
			cbB = (...r) => {
				fn(...r);
			};
		},
		removeEventListener: (eventName, fn) => {
			cbB = null;
		}
	};

	return [objA, objB];
}

describe('Workers ', () => {
	it('can call and respond equally', done => {
		const [a, b] = FakeWorkerPair();
		let masterApi, slaveApi;

		return Promise.all([
			WorkerPortal(
				{
					slaveAdd: (a, b) => a + b,
					math: {
						multiply: (a, b) => a * b,
						lib: {
							pow: (a, b) => Math.pow(a, b)
						}
					}
				},
				a,
				true
			),
			WorkerPortal(
				{
					masterSubtract: (a, b) => a - b
				},
				b,
				false
			)
		])
			.then(([slave, master]) => {
				masterApi = master;
				slaveApi = slave;

				expect(Object.keys(masterApi)).toEqual([
					'__init',
					'__cleanupSlave',
					'slaveAdd',
					'math',
					'_cleanup'
				]);
				expect(Object.keys(masterApi.math)).toEqual(['multiply', 'lib']);
				expect(Object.keys(slaveApi)).toEqual(['masterSubtract']);

				return Promise.all([
					slaveApi.masterSubtract(9, 2),
					masterApi.slaveAdd(9, 2),
					masterApi.math.multiply(9, 2),
					masterApi.math.lib.pow(9, 2)
				]);
			})
			.then(results => {
				expect(results).toEqual([7, 11, 18, 81]);

				return Promise.all([masterApi.slaveAdd(5, 2), slaveApi.masterSubtract(2, 2)]);
			})
			.then(results => {
				expect(results).toEqual([7, 0]);
				return masterApi._cleanup();
			})
			.catch(e => {
				fail(e);
			})
			.then(() => {
				return masterApi.slaveAdd(9, 2);
			})
			.then(e => {
				fail('Expected rejection');
			})
			.catch(e => {
				expect(e.message).toBe('Portal disabled');
				done();
			});
	});
});