import assert from 'node:assert';
import { EntityRegistry } from '../src/ecs.js';

class Position {
	constructor(x, y) {
		this.x = x;
		this.y = y;
	}
}

describe('ECS', function () {
	it('create', function () {
		let registry = new EntityRegistry();
		let id = registry.create();
	});

	it('destory', function () {
		let registry = new EntityRegistry();
		let id0 = registry.create();
		let id1 = registry.destory(id0).create();
		assert.equal(id0, id1);
	});

	it('component', function () {
		let registry = new EntityRegistry();
		let id3;
		for (let i = 0; i < 5; i += 1) {
			let e = registry.create();
			registry.assign(e, new Position(i, i));
			if (i == 3) {
				id3 = e;
			}
		}
		assert.equal(registry.get(id3, Position).x, 3);
	});

	it('forEach', function () {
		let registry = new EntityRegistry();
		let id3;
		registry.create();
		registry.create();
		for (let i = 0; i < 5; i += 1) {
			let e = registry.create();
			registry.assign(e, new Position(i, i));
			if (i == 3) {
				id3 = e;
			}
		}
		let count = 0;
		registry.forEach([], () => {
			count += 1;
		});
		assert.equal(count, 7);
		registry.forEach([Position], (id, pos) => {
			pos.x += 1;
		});
		assert.equal(registry.get(id3, Position).x, 4);
	});
});