import assert from 'node:assert';
import { Vec2, Circle } from '../src/2d.js';

describe('Vec2', function () {
	it('construct', function() {
		let p = new Vec2(1, 2);
		assert.equal(p.x, 1);
		assert.equal(p.y, 2);
	});

	it('equal', function() {
		assert.ok((new Vec2(1, 2)).equal(new Vec2(1, 2)));
		assert.ok(!(new Vec2(1, 2)).equal(new Vec2(1, 12)));
	});

	it('vector calculation', function() {
		let p = new Vec2(2, 4), q = new Vec2(3, 1);
		assert.ok(p.add(q).equal(new Vec2(5, 5)));
		assert.ok(p.sub(q).equal(new Vec2(-1, 3)));
		assert.ok(p.mul(1.5).equal(new Vec2(3, 6)));
		assert.ok(p.yx().equal(new Vec2(4, 2)));
	});

	it('vector calculation(TO)', function () {
		let p = new Vec2(2, 4), q = new Vec2(3, 1);
		p.addTo(q);
		assert.ok(p.equal(new Vec2(5, 5)));
		p.subTo(q);
		assert.ok(p.equal(new Vec2(2, 4)));
		p.mulTo(1.5);
		assert.ok(p.equal(new Vec2(3, 6)));
	});

	it('abs & norm', function() {
		let p = new Vec2(3, 4);
		assert.equal(p.abs(), 5);
		assert.equal(p.norm(), 25);
	});

	it('complex calculation', function() {
		let p = new Vec2(1, 4), q = new Vec2(0, 1);
		assert.ok(p.complexMul(q).equal(new Vec2(-4, 1)));
		assert.ok(p.complexDiv(q).equal(new Vec2(4, -1)));
		assert.equal(q.arg(), Math.PI / 2);
	});

	it('dot & cross product', function() {
		let p = new Vec2(2, 4), q = new Vec2(3, 1);
		assert.equal(p.dot(q), 10);
		assert.equal(p.cross(q), -10);
	});

	it('circle intersect', function() {
		let c1 = new Circle(new Vec2(0, 0), 1);
		let c2 = new Circle(new Vec2(0, 1.5), 1);
		let c3 = new Circle(new Vec2(2, 2), 1);
		assert.ok(Circle.intersect(c1, c2));
		assert.ok(!Circle.intersect(c1, c3));
	});

	it('circle collision elimation', function() {
		let c1 = new Circle(new Vec2(0, 0), 1);
		let c2 = new Circle(new Vec2(0, 1.5), 1);
		assert.ok(Circle.collisionElimation(c1, c2));
		assert.ok(c1.equal(new Circle(new Vec2(0, -.25), 1)));
		assert.ok(c2.equal(new Circle(new Vec2(0, 1.75), 1)));
	});
});