import test from 'node:test';
import assert from 'node:assert/strict';

import { computePalmAimRay } from '../vr180player/xr/hand-aim.js';

const wrist = { x: 0, y: 0, z: 0 };
const middleMetacarpal = { x: 0, y: 0.1, z: 0 };
const ringMetacarpal = { x: 0.025, y: 0.1, z: 0 };

test('computePalmAimRay points out from a right palm instead of following the index finger', () => {
	const ray = computePalmAimRay({
		handedness: 'right',
		indexMetacarpal: { x: -0.035, y: 0.1, z: 0 },
		middleMetacarpal,
		pinkyMetacarpal: { x: 0.055, y: 0.1, z: 0 },
		ringMetacarpal,
		wrist
	});

	assert.ok(ray);
	assert.equal(Math.round(ray.direction.x * 1000) / 1000, 0);
	assert.equal(Math.round(ray.direction.y * 1000) / 1000, 0);
	assert.equal(Math.round(ray.direction.z * 1000) / 1000, -1);
	assert.equal(Math.round(ray.origin.z * 1000) / 1000, -0.035);
});

test('computePalmAimRay flips the palm normal for a left hand', () => {
	const ray = computePalmAimRay({
		handedness: 'left',
		indexMetacarpal: { x: 0.035, y: 0.1, z: 0 },
		middleMetacarpal,
		pinkyMetacarpal: { x: -0.055, y: 0.1, z: 0 },
		ringMetacarpal: { x: -0.025, y: 0.1, z: 0 },
		wrist
	});

	assert.ok(ray);
	assert.equal(Math.round(ray.direction.z * 1000) / 1000, -1);
});

test('computePalmAimRay returns null when palm joints cannot define a stable ray', () => {
	assert.equal(computePalmAimRay({ handedness: 'right', wrist }), null);
	assert.equal(computePalmAimRay({
		handedness: 'right',
		indexMetacarpal: { x: 0, y: 0.1, z: 0 },
		pinkyMetacarpal: { x: 0, y: 0.1, z: 0 },
		wrist
	}), null);
});