const { container, computed } = require('../lib/index.js');
const { hashSet } = require('../lib/util.js');

describe('A container', () => {
	it('notifies dependents of updates', () => {
		let runCount = 0;
		let currentValue = new Set();
		const a = container(new Set(), hashSet);
		const b = computed(s => Array.from(s).reduce((i, acc) => i + acc, 0), [a]);
		a.subscribe(val => {
			runCount += 1;
			expect(hashSet(a)).toEqual(hashSet(currentValue));
		});
		currentValue.add(1);
		a.add(1);
		expect(runCount).toEqual(1);
		expect(b()).toEqual(1);
		currentValue.add(2);
		a.add(2);
		expect(runCount).toEqual(2);
		expect(b()).toEqual(3);
	});

	it('works for arrays', () => {
		let runCount = 0;
		let currentValue = [];
		const a = container([], arr => arr.join('x'));
		a.subscribe(val => {
			runCount += 1;
			expect(a.join('x')).toEqual(currentValue.join('x'));
		});
		currentValue.push(1);
		a.push(1);
		expect(runCount).toEqual(1);
		currentValue.push(2);
		a.push(2);
		expect(runCount).toEqual(2);
		currentValue.push(3);
		a._.push(3);
		expect(runCount).toEqual(2);
	});

	it('._ returns the proxied element', () => {
		let runCount = 0;
		let currentValue = new Set();
		const a = container(new Set(), hashSet);
		a.subscribe(val => {
			runCount += 1;
			expect(hashSet(a)).toEqual(hashSet(currentValue));
		});
		currentValue.add(1);
		a.add(1);
		expect(runCount).toEqual(1);
		currentValue.add(2);
		a.add(2);
		expect(runCount).toEqual(2);
		currentValue.add(3);
		a._.add(3);
		expect(runCount).toEqual(2);
	});
});