/**
 * Donut — Codels 3D model library
 * License: CC0-1.0 · Units: meters · Y-up · Front: +Z · Origin: center of the base (y = 0)
 * Triangles: 1,408 · Size (W × H × D): 0.09 × 0.03 × 0.09 m
 *
 * Usage:
 *   import { createDonut } from './donut.js';
 *   
 *   const model = createDonut();
 *   model.position.set(0, 0, 0);
 *   scene.add(model);
 */
import * as THREE from 'three';

const deg = THREE.MathUtils.degToRad;

// Deterministic vertex displacement (organic low-poly look).
function jitter(geometry, amount, seed) {
  const pos = geometry.attributes.position;
  const h = (a, b, c, s) => {
    let x = Math.imul(a, 73856093) ^ Math.imul(b, 19349663) ^ Math.imul(c, 83492791) ^ Math.imul(s, 2654435761);
    x = Math.imul(x ^ (x >>> 16), 2246822507);
    x = Math.imul(x ^ (x >>> 13), 3266489909);
    return ((x ^ (x >>> 16)) >>> 0) / 4294967295 - 0.5;
  };
  for (let i = 0; i < pos.count; i++) {
    const x = pos.getX(i), y = pos.getY(i), z = pos.getZ(i);
    const qx = Math.round(x * 1000), qy = Math.round(y * 1000), qz = Math.round(z * 1000);
    pos.setXYZ(i, x + h(qx, qy, qz, seed) * 2 * amount, y + h(qx, qy, qz, seed + 1) * 2 * amount, z + h(qx, qy, qz, seed + 2) * 2 * amount);
  }
  pos.needsUpdate = true;
  geometry.computeVertexNormals();
  return geometry;
}

export function createDonut() {
  const root = new THREE.Group();
  root.name = 'Donut';

  // Materials
  const sprinkle1Mat = new THREE.MeshStandardMaterial({ name: 'sprinkle1', color: 0xff5a5f, roughness: 0.4, flatShading: true });
  const sprinkle2Mat = new THREE.MeshStandardMaterial({ name: 'sprinkle2', color: 0xffd23f, roughness: 0.4, flatShading: true });
  const sprinkle3Mat = new THREE.MeshStandardMaterial({ name: 'sprinkle3', color: 0x3ec1d3, roughness: 0.4, flatShading: true });
  const sprinkle4Mat = new THREE.MeshStandardMaterial({ name: 'sprinkle4', color: 0x7ed957, roughness: 0.4, flatShading: true });
  const sprinkle5Mat = new THREE.MeshStandardMaterial({ name: 'sprinkle5', color: 0xffffff, roughness: 0.4, flatShading: true });
  const sprinkle6Mat = new THREE.MeshStandardMaterial({ name: 'sprinkle6', color: 0xa66cff, roughness: 0.4, flatShading: true });
  const doughMat = new THREE.MeshStandardMaterial({ name: 'dough', color: 0xe0a35a, roughness: 0.75 });
  const icingMat = new THREE.MeshStandardMaterial({ name: 'icing', color: 0xf58fb6, roughness: 0.3 });

  // Shared geometries
  const boxGeo = new THREE.BoxGeometry(0.055, 0.014, 0.014);

  // Parts
  const donut = new THREE.Group();
  donut.name = 'donut';
  donut.scale.setScalar(0.09);
  root.add(donut);
  const dough = new THREE.Mesh(new THREE.TorusGeometry(0.31, 0.19, 10, 22), doughMat);
  dough.name = 'dough';
  dough.position.set(0, 0.1634, 0);
  dough.rotation.set(deg(90), 0, 0);
  dough.scale.set(1, 1, 0.86);
  donut.add(dough);
  const icing = new THREE.Mesh(jitter(new THREE.TorusGeometry(0.31, 0.2014, 10, 22), 0.008, 4), icingMat);
  icing.name = 'icing';
  icing.position.set(0, 0.2204, 0);
  icing.rotation.set(deg(90), 0, 0);
  icing.scale.set(1, 1, 0.62);
  donut.add(icing);
  const sprinkle1 = new THREE.Group();
  sprinkle1.name = 'sprinkle1';
  sprinkle1.position.set(-0.308, 0.344, -0.1395);
  sprinkle1.rotation.set(deg(-2.0641), 0, deg(4.5449));
  donut.add(sprinkle1);
  const box5 = new THREE.Mesh(boxGeo, sprinkle1Mat);
  box5.rotation.set(0, deg(50.9911), 0);
  sprinkle1.add(box5);
  const sprinkle2 = new THREE.Group();
  sprinkle2.name = 'sprinkle2';
  sprinkle2.position.set(-0.2383, 0.345, -0.2171);
  sprinkle2.rotation.set(deg(-1.4736), 0, deg(1.6166));
  donut.add(sprinkle2);
  const box7 = new THREE.Mesh(boxGeo, sprinkle2Mat);
  box7.rotation.set(0, deg(160.558), 0);
  sprinkle2.add(box7);
  const sprinkle3 = new THREE.Group();
  sprinkle3.name = 'sprinkle3';
  sprinkle3.position.set(0.267, 0.3351, 0.284);
  sprinkle3.rotation.set(deg(11.0292), 0, deg(-10.1951));
  donut.add(sprinkle3);
  const box9 = new THREE.Mesh(boxGeo, sprinkle3Mat);
  box9.rotation.set(0, deg(79.7119), 0);
  sprinkle3.add(box9);
  const sprinkle4 = new THREE.Group();
  sprinkle4.name = 'sprinkle4';
  sprinkle4.position.set(0.0753, 0.3054, 0.4513);
  sprinkle4.rotation.set(deg(33.3412), 0, deg(-5.2419));
  donut.add(sprinkle4);
  const box11 = new THREE.Mesh(boxGeo, sprinkle4Mat);
  box11.rotation.set(0, deg(61.2374), 0);
  sprinkle4.add(box11);
  const sprinkle5 = new THREE.Group();
  sprinkle5.name = 'sprinkle5';
  sprinkle5.position.set(-0.2973, 0.3343, 0.2564);
  sprinkle5.rotation.set(deg(10.3149), 0, deg(11.7309));
  donut.add(sprinkle5);
  const box13 = new THREE.Mesh(boxGeo, sprinkle5Mat);
  box13.rotation.set(0, deg(17.4507), 0);
  sprinkle5.add(box13);
  const sprinkle6 = new THREE.Group();
  sprinkle6.name = 'sprinkle6';
  sprinkle6.position.set(0.3897, 0.3096, 0.227);
  sprinkle6.rotation.set(deg(17.0123), 0, deg(-26.6709));
  donut.add(sprinkle6);
  const box15 = new THREE.Mesh(boxGeo, sprinkle6Mat);
  box15.rotation.set(0, deg(99.7794), 0);
  sprinkle6.add(box15);
  const sprinkle7 = new THREE.Group();
  sprinkle7.name = 'sprinkle7';
  sprinkle7.position.set(0.2208, 0.2674, 0.4448);
  sprinkle7.rotation.set(deg(53.8002), 0, deg(-21.8253));
  donut.add(sprinkle7);
  const box17 = new THREE.Mesh(boxGeo, sprinkle1Mat);
  box17.rotation.set(0, deg(87.9619), 0);
  sprinkle7.add(box17);
  const sprinkle8 = new THREE.Group();
  sprinkle8.name = 'sprinkle8';
  sprinkle8.position.set(0.0338, 0.3442, -0.2816);
  sprinkle8.rotation.set(deg(4.6446), 0, deg(0.5569));
  donut.add(sprinkle8);
  const box19 = new THREE.Mesh(boxGeo, sprinkle2Mat);
  box19.rotation.set(0, deg(83.8255), 0);
  sprinkle8.add(box19);
  const sprinkle9 = new THREE.Group();
  sprinkle9.name = 'sprinkle9';
  sprinkle9.position.set(0.1823, 0.3331, -0.1287);
  sprinkle9.rotation.set(deg(9.6986), 0, deg(13.4235));
  donut.add(sprinkle9);
  const box21 = new THREE.Mesh(boxGeo, sprinkle3Mat);
  box21.rotation.set(0, deg(144.8156), 0);
  sprinkle9.add(box21);
  const sprinkle10 = new THREE.Group();
  sprinkle10.name = 'sprinkle10';
  sprinkle10.position.set(0.1869, 0.3357, 0.1388);
  sprinkle10.rotation.set(deg(-8.7164), 0, deg(11.5345));
  donut.add(sprinkle10);
  const box23 = new THREE.Mesh(boxGeo, sprinkle4Mat);
  box23.rotation.set(0, deg(106.0369), 0);
  sprinkle10.add(box23);
  const sprinkle11 = new THREE.Group();
  sprinkle11.name = 'sprinkle11';
  sprinkle11.position.set(0.1607, 0.3333, -0.3621);
  sprinkle11.rotation.set(deg(-15.0174), 0, deg(-6.5609));
  donut.add(sprinkle11);
  const box25 = new THREE.Mesh(boxGeo, sprinkle5Mat);
  box25.rotation.set(0, deg(68.7118), 0);
  sprinkle11.add(box25);
  const sprinkle12 = new THREE.Group();
  sprinkle12.name = 'sprinkle12';
  sprinkle12.position.set(-0.0902, 0.3373, -0.2218);
  sprinkle12.rotation.set(deg(12.1323), 0, deg(-4.8866));
  donut.add(sprinkle12);
  const box27 = new THREE.Mesh(boxGeo, sprinkle6Mat);
  box27.rotation.set(0, deg(76.5529), 0);
  sprinkle12.add(box27);
  const sprinkle13 = new THREE.Group();
  sprinkle13.name = 'sprinkle13';
  sprinkle13.position.set(-0.0979, 0.2738, -0.0824);
  sprinkle13.rotation.set(deg(40.15), 0, deg(-37.4483));
  donut.add(sprinkle13);
  const box29 = new THREE.Mesh(boxGeo, sprinkle1Mat);
  box29.rotation.set(0, deg(104.7462), 0);
  sprinkle13.add(box29);
  const sprinkle14 = new THREE.Group();
  sprinkle14.name = 'sprinkle14';
  sprinkle14.position.set(0.0085, 0.3306, 0.4047);
  sprinkle14.rotation.set(deg(18.3058), 0, deg(-0.3786));
  donut.add(sprinkle14);
  const box31 = new THREE.Mesh(boxGeo, sprinkle2Mat);
  box31.rotation.set(0, deg(155.6567), 0);
  sprinkle14.add(box31);
  const sprinkle15 = new THREE.Group();
  sprinkle15.name = 'sprinkle15';
  sprinkle15.position.set(0.1484, 0.3093, 0.0798);
  sprinkle15.rotation.set(deg(-16.1637), 0, deg(27.3628));
  donut.add(sprinkle15);
  const box33 = new THREE.Mesh(boxGeo, sprinkle3Mat);
  box33.rotation.set(0, deg(115.2804), 0);
  sprinkle15.add(box33);
  const sprinkle16 = new THREE.Group();
  sprinkle16.name = 'sprinkle16';
  sprinkle16.position.set(0.2259, 0.3449, -0.2339);
  sprinkle16.rotation.set(deg(-1.9318), 0, deg(-1.8649));
  donut.add(sprinkle16);
  const box35 = new THREE.Mesh(boxGeo, sprinkle4Mat);
  box35.rotation.set(0, deg(10.7344), 0);
  sprinkle16.add(box35);
  const sprinkle17 = new THREE.Group();
  sprinkle17.name = 'sprinkle17';
  sprinkle17.position.set(0.1587, 0.324, -0.1177);
  sprinkle17.rotation.set(deg(13.9503), 0, deg(18.0145));
  donut.add(sprinkle17);
  const box37 = new THREE.Mesh(boxGeo, sprinkle5Mat);
  box37.rotation.set(0, deg(70.5712), 0);
  sprinkle17.add(box37);
  const sprinkle18 = new THREE.Group();
  sprinkle18.name = 'sprinkle18';
  sprinkle18.position.set(0.0929, 0.3247, 0.4103);
  sprinkle18.rotation.set(deg(21.6788), 0, deg(-4.7791));
  donut.add(sprinkle18);
  const box39 = new THREE.Mesh(boxGeo, sprinkle6Mat);
  box39.rotation.set(0, deg(38.6076), 0);
  sprinkle18.add(box39);
  const sprinkle19 = new THREE.Group();
  sprinkle19.name = 'sprinkle19';
  sprinkle19.position.set(-0.0823, 0.2977, 0.1276);
  sprinkle19.rotation.set(deg(-33.451), 0, deg(-19.5784));
  donut.add(sprinkle19);
  const box41 = new THREE.Mesh(boxGeo, sprinkle1Mat);
  box41.rotation.set(0, deg(6.3323), 0);
  sprinkle19.add(box41);
  const sprinkle20 = new THREE.Group();
  sprinkle20.name = 'sprinkle20';
  sprinkle20.position.set(0.4737, 0.2879, -0.074);
  sprinkle20.rotation.set(deg(-8.4776), 0, deg(-43.346));
  donut.add(sprinkle20);
  const box43 = new THREE.Mesh(boxGeo, sprinkle2Mat);
  box43.rotation.set(0, deg(37.911), 0);
  sprinkle20.add(box43);
  const sprinkle21 = new THREE.Group();
  sprinkle21.name = 'sprinkle21';
  sprinkle21.position.set(-0.1488, 0.3186, 0.111);
  sprinkle21.rotation.set(deg(-16.2161), 0, deg(-20.5301));
  donut.add(sprinkle21);
  const box45 = new THREE.Mesh(boxGeo, sprinkle3Mat);
  box45.rotation.set(0, deg(49.143), 0);
  sprinkle21.add(box45);
  const sprinkle22 = new THREE.Group();
  sprinkle22.name = 'sprinkle22';
  sprinkle22.position.set(0.4404, 0.3114, 0.0819);
  sprinkle22.rotation.set(deg(6.0846), 0, deg(-29.6753));
  donut.add(sprinkle22);
  const box47 = new THREE.Mesh(boxGeo, sprinkle4Mat);
  box47.rotation.set(0, deg(162.2151), 0);
  sprinkle22.add(box47);
  const sprinkle23 = new THREE.Group();
  sprinkle23.name = 'sprinkle23';
  sprinkle23.position.set(0.4241, 0.3201, 0.0779);
  sprinkle23.rotation.set(deg(4.8256), 0, deg(-24.6114));
  donut.add(sprinkle23);
  const box49 = new THREE.Mesh(boxGeo, sprinkle5Mat);
  box49.rotation.set(0, deg(44.1494), 0);
  sprinkle23.add(box49);
  const sprinkle24 = new THREE.Group();
  sprinkle24.name = 'sprinkle24';
  sprinkle24.position.set(0.4879, 0.2779, -0.0303);
  sprinkle24.rotation.set(deg(-4.2332), 0, deg(-49.967));
  donut.add(sprinkle24);
  const box51 = new THREE.Mesh(boxGeo, sprinkle6Mat);
  box51.rotation.set(0, deg(136.5695), 0);
  sprinkle24.add(box51);
  const sprinkle25 = new THREE.Group();
  sprinkle25.name = 'sprinkle25';
  sprinkle25.position.set(0.0861, 0.3244, 0.179);
  sprinkle25.rotation.set(deg(-20.3547), 0, deg(9.501));
  donut.add(sprinkle25);
  const box53 = new THREE.Mesh(boxGeo, sprinkle1Mat);
  box53.rotation.set(0, deg(73.9506), 0);
  sprinkle25.add(box53);
  const sprinkle26 = new THREE.Group();
  sprinkle26.name = 'sprinkle26';
  sprinkle26.position.set(-0.1795, 0.3136, -0.4061);
  sprinkle26.rotation.set(deg(-26.8218), 0, deg(11.2813));
  donut.add(sprinkle26);
  const box55 = new THREE.Mesh(boxGeo, sprinkle2Mat);
  box55.rotation.set(0, deg(84.5641), 0);
  sprinkle26.add(box55);
  const sprinkle27 = new THREE.Group();
  sprinkle27.name = 'sprinkle27';
  sprinkle27.position.set(0.0979, 0.3189, 0.4225);
  sprinkle27.rotation.set(deg(25.1766), 0, deg(-5.6308));
  donut.add(sprinkle27);
  const box57 = new THREE.Mesh(boxGeo, sprinkle3Mat);
  box57.rotation.set(0, deg(68.2202), 0);
  sprinkle27.add(box57);
  const sprinkle28 = new THREE.Group();
  sprinkle28.name = 'sprinkle28';
  sprinkle28.position.set(0.1469, 0.3438, -0.2376);
  sprinkle28.rotation.set(deg(4.6426), 0, deg(2.8659));
  donut.add(sprinkle28);
  const box59 = new THREE.Mesh(boxGeo, sprinkle4Mat);
  box59.rotation.set(0, deg(71.3566), 0);
  sprinkle28.add(box59);
  const sprinkle29 = new THREE.Group();
  sprinkle29.name = 'sprinkle29';
  sprinkle29.position.set(0.2644, 0.3439, -0.0914);
  sprinkle29.rotation.set(deg(1.7606), 0, deg(5.0809));
  donut.add(sprinkle29);
  const box61 = new THREE.Mesh(boxGeo, sprinkle5Mat);
  box61.rotation.set(0, deg(163.6754), 0);
  sprinkle29.add(box61);
  const sprinkle30 = new THREE.Group();
  sprinkle30.name = 'sprinkle30';
  sprinkle30.position.set(-0.2257, 0.3422, -0.2736);
  sprinkle30.rotation.set(deg(-6.2117), 0, deg(5.1002));
  donut.add(sprinkle30);
  const box63 = new THREE.Mesh(boxGeo, sprinkle6Mat);
  box63.rotation.set(0, deg(131.9645), 0);
  sprinkle30.add(box63);
  const sprinkle31 = new THREE.Group();
  sprinkle31.name = 'sprinkle31';
  sprinkle31.position.set(-0.2349, 0.3074, -0.3891);
  sprinkle31.rotation.set(deg(-28.6815), 0, deg(16.1594));
  donut.add(sprinkle31);
  const box65 = new THREE.Mesh(boxGeo, sprinkle1Mat);
  box65.rotation.set(0, deg(125.4892), 0);
  sprinkle31.add(box65);
  const sprinkle32 = new THREE.Group();
  sprinkle32.name = 'sprinkle32';
  sprinkle32.position.set(0.1371, 0.3427, 0.2317);
  sprinkle32.rotation.set(deg(-6.3024), 0, deg(3.7169));
  donut.add(sprinkle32);
  const box67 = new THREE.Mesh(boxGeo, sprinkle2Mat);
  box67.rotation.set(0, deg(168.4335), 0);
  sprinkle32.add(box67);
  const sprinkle33 = new THREE.Group();
  sprinkle33.name = 'sprinkle33';
  sprinkle33.position.set(-0.4827, 0.2668, -0.1185);
  sprinkle33.rotation.set(deg(-20.2922), 0, deg(54.6969));
  donut.add(sprinkle33);
  const box69 = new THREE.Mesh(boxGeo, sprinkle3Mat);
  box69.rotation.set(0, deg(123.0071), 0);
  sprinkle33.add(box69);
  const sprinkle34 = new THREE.Group();
  sprinkle34.name = 'sprinkle34';
  sprinkle34.position.set(0.2178, 0.3314, -0.0044);
  sprinkle34.rotation.set(deg(0.3673), 0, deg(17.6978));
  donut.add(sprinkle34);
  const box71 = new THREE.Mesh(boxGeo, sprinkle4Mat);
  box71.rotation.set(0, deg(5.0164), 0);
  sprinkle34.add(box71);
  const sprinkle35 = new THREE.Group();
  sprinkle35.name = 'sprinkle35';
  sprinkle35.position.set(-0.0624, 0.3359, 0.2249);
  sprinkle35.rotation.set(deg(-13.803), 0, deg(-3.7843));
  donut.add(sprinkle35);
  const box73 = new THREE.Mesh(boxGeo, sprinkle5Mat);
  box73.rotation.set(0, deg(47.9673), 0);
  sprinkle35.add(box73);
  const sprinkle36 = new THREE.Group();
  sprinkle36.name = 'sprinkle36';
  sprinkle36.position.set(-0.1498, 0.2964, 0.0103);
  sprinkle36.rotation.set(deg(-3.1854), 0, deg(-38.8348));
  donut.add(sprinkle36);
  const box75 = new THREE.Mesh(boxGeo, sprinkle6Mat);
  box75.rotation.set(0, deg(40.4357), 0);
  sprinkle36.add(box75);
  const sprinkle37 = new THREE.Group();
  sprinkle37.name = 'sprinkle37';
  sprinkle37.position.set(-0.2833, 0.344, 0.1856);
  sprinkle37.rotation.set(deg(2.7971), 0, deg(4.2612));
  donut.add(sprinkle37);
  const box77 = new THREE.Mesh(boxGeo, sprinkle1Mat);
  box77.rotation.set(0, deg(83.9575), 0);
  sprinkle37.add(box77);
  const sprinkle38 = new THREE.Group();
  sprinkle38.name = 'sprinkle38';
  sprinkle38.position.set(-0.0916, 0.2788, 0.095);
  sprinkle38.rotation.set(deg(-40.1594), 0, deg(-31.8774));
  donut.add(sprinkle38);
  const box79 = new THREE.Mesh(boxGeo, sprinkle2Mat);
  box79.rotation.set(0, deg(2.9683), 0);
  sprinkle38.add(box79);
  const sprinkle39 = new THREE.Group();
  sprinkle39.name = 'sprinkle39';
  sprinkle39.position.set(-0.0267, 0.3415, 0.3578);
  sprinkle39.rotation.set(deg(8.7744), 0, deg(0.6512));
  donut.add(sprinkle39);
  const box81 = new THREE.Mesh(boxGeo, sprinkle3Mat);
  box81.rotation.set(0, deg(133.4222), 0);
  sprinkle39.add(box81);
  const sprinkle40 = new THREE.Group();
  sprinkle40.name = 'sprinkle40';
  sprinkle40.position.set(-0.1283, 0.3066, 0.1025);
  sprinkle40.rotation.set(deg(-22.0914), 0, deg(-25.206));
  donut.add(sprinkle40);
  const box83 = new THREE.Mesh(boxGeo, sprinkle4Mat);
  box83.rotation.set(0, deg(104.7399), 0);
  sprinkle40.add(box83);
  const sprinkle41 = new THREE.Group();
  sprinkle41.name = 'sprinkle41';
  sprinkle41.position.set(-0.0865, 0.3, 0.1284);
  sprinkle41.rotation.set(deg(-31.8699), 0, deg(-19.5772));
  donut.add(sprinkle41);
  const box85 = new THREE.Mesh(boxGeo, sprinkle5Mat);
  box85.rotation.set(0, deg(84.4294), 0);
  sprinkle41.add(box85);
  const sprinkle42 = new THREE.Group();
  sprinkle42.name = 'sprinkle42';
  sprinkle42.position.set(0.2149, 0.3418, 0.2855);
  sprinkle42.rotation.set(deg(6.826), 0, deg(-5.1114));
  donut.add(sprinkle42);
  const box87 = new THREE.Mesh(boxGeo, sprinkle6Mat);
  box87.rotation.set(0, deg(10.4155), 0);
  sprinkle42.add(box87);
  const sprinkle43 = new THREE.Group();
  sprinkle43.name = 'sprinkle43';
  sprinkle43.position.set(0.1427, 0.3174, -0.4128);
  sprinkle43.rotation.set(deg(-25.3935), 0, deg(-8.4294));
  donut.add(sprinkle43);
  const box89 = new THREE.Mesh(boxGeo, sprinkle1Mat);
  box89.rotation.set(0, deg(117.7714), 0);
  sprinkle43.add(box89);
  const sprinkle44 = new THREE.Group();
  sprinkle44.name = 'sprinkle44';
  sprinkle44.position.set(0.1753, 0.3227, -0.0844);
  sprinkle44.rotation.set(deg(10.6561), 0, deg(21.0114));
  donut.add(sprinkle44);
  const box91 = new THREE.Mesh(boxGeo, sprinkle2Mat);
  box91.rotation.set(0, deg(73.3164), 0);
  sprinkle44.add(box91);

  root.traverse((o) => {
    if (o.isMesh) {
      o.castShadow = true;
      o.receiveShadow = true;
    }
  });
  return root;
}

export default createDonut;