import {
  Vec3,
  vec3Add,
  vec3Dot,
  vec3FromArray,
  vec3Length,
  vec3Negate,
  vec3Normalize,
  vec3Parse,
  vec3Scale,
  vec3Subtract,
  vec3ToArray,
  vec3ToString
} from './Vec3.js';

describe('vec3 value type', () => {
  test('constructor', () => {
    const value = new Vec3(1, 2, 3);
    expect(value.x).toEqual(1);
    expect(value.y).toEqual(2);
    expect(value.z).toEqual(3);
  });
  test('add', () => {
    const value = vec3Add(new Vec3(1, 2, 3), new Vec3(3, 4, 5));
    expect(value.x).toEqual(4);
    expect(value.y).toEqual(6);
    expect(value.z).toEqual(8);
  });
  test('subtract', () => {
    const value = vec3Subtract(new Vec3(1, 2, 3), new Vec3(3, 8, 13));
    expect(value.x).toEqual(-2);
    expect(value.y).toEqual(-6);
    expect(value.z).toEqual(-10);
  });
  test('scale', () => {
    const value = vec3Scale(new Vec3(1, 2, 3), 2);
    expect(value.x).toEqual(2);
    expect(value.y).toEqual(4);
    expect(value.z).toEqual(6);
  });
  test('negate', () => {
    const value = vec3Negate(new Vec3(1, 2, 3));
    expect(value.x).toEqual(-1);
    expect(value.y).toEqual(-2);
    expect(value.z).toEqual(-3);
  });
  test('length', () => {
    const value = vec3Length(new Vec3(1, 2, 3));
    expect(value).toEqual(Math.sqrt(1 + 2 * 2 + 3 * 3));
  });
  test('normalize', () => {
    const value = vec3Normalize(new Vec3(0, 0, 2));
    expect(value.x).toEqual(0);
    expect(value.y).toEqual(0);
    expect(value.z).toEqual(1);
  });
  test('dot', () => {
    const value = vec3Dot(new Vec3(0, 2, 1), new Vec3(3, 4, 1));
    expect(value).toEqual(9);
  });
  test('fromArray', () => {
    const value = vec3FromArray([1, 2, 3, 4], 1);
    expect(value.x).toEqual(2);
    expect(value.y).toEqual(3);
    expect(value.z).toEqual(4);
  });
  test('fromArray', () => {
    const array = [1, 2, 3];
    vec3ToArray(new Vec3(6, 7, 8), array, 1);
    expect(array[1]).toEqual(6);
    expect(array[2]).toEqual(7);
    expect(array[3]).toEqual(8);
  });
  test('toString/parser', () => {
    const v = new Vec3(10, 5.5, -9);
    const text = vec3ToString(v);
    const v2 = vec3Parse(text);
    expect(v.x).toEqual(v2.x);
    expect(v.y).toEqual(v2.y);
    expect(v.z).toEqual(v2.z);
  });
});