/**
 * Burger — Codels 3D model library
 * License: CC0-1.0 · Units: meters · Y-up · Front: +Z · Origin: center of the base (y = 0)
 * Triangles: 1,184 · Size (W × H × D): 0.13 × 0.09 × 0.13 m
 *
 * Usage:
 *   import { createBurger } from './burger.js';
 *   
 *   const model = createBurger();
 *   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;
}

// Revolve a 2D profile [[radius, y], ...] around the Y axis.
function lathe(points, segments, phiStart = 0, phiLength = Math.PI * 2) {
  return new THREE.LatheGeometry(points.map(([x, y]) => new THREE.Vector2(x, y)), segments, phiStart, phiLength);
}

// Extrude a 2D outline along Z (centered). bevel = [thickness, size, segments].
function extrude(outline, depth, holes = [], bevel = null) {
  const shape = new THREE.Shape(outline.map(([x, y]) => new THREE.Vector2(x, y)));
  for (const hole of holes) shape.holes.push(new THREE.Path(hole.map(([x, y]) => new THREE.Vector2(x, y))));
  const options = bevel
    ? { depth, bevelEnabled: true, bevelThickness: bevel[0], bevelSize: bevel[1], bevelSegments: bevel[2] }
    : { depth, bevelEnabled: false };
  return new THREE.ExtrudeGeometry(shape, options).translate(0, 0, -depth / 2);
}

export function createBurger() {
  const root = new THREE.Group();
  root.name = 'Burger';

  // Materials
  const bunMat = new THREE.MeshStandardMaterial({ name: 'bun', color: 0xd98c3a, roughness: 0.6, flatShading: true });
  const crumbMat = new THREE.MeshStandardMaterial({ name: 'crumb', color: 0xf0cf8e, roughness: 0.8, flatShading: true });
  const pattyMat = new THREE.MeshStandardMaterial({ name: 'patty', color: 0x5b3220, roughness: 0.9, flatShading: true });
  const cheeseMat = new THREE.MeshStandardMaterial({ name: 'cheese', color: 0xffc928, roughness: 0.45, flatShading: true });
  const tomatoMat = new THREE.MeshStandardMaterial({ name: 'tomato', color: 0xe23a2e, roughness: 0.5, flatShading: true });
  const lettuceMat = new THREE.MeshStandardMaterial({ name: 'lettuce', color: 0x74c24a, roughness: 0.7, flatShading: true });
  const seedMat = new THREE.MeshStandardMaterial({ name: 'seed', color: 0xfbf0d2, roughness: 0.6, flatShading: true });

  // Shared geometries
  const sphereGeo = new THREE.SphereGeometry(0.034, 5, 3);

  // Parts
  const burger = new THREE.Group();
  burger.name = 'burger';
  burger.scale.setScalar(0.11);
  root.add(burger);
  const bottomBun = new THREE.Mesh(lathe([[0, 0], [0.42, 0], [0.48, 0.025], [0.5, 0.07], [0.49, 0.12], [0.47, 0.14], [0, 0.14]], 16), bunMat);
  bottomBun.name = 'bottomBun';
  burger.add(bottomBun);
  const bottomCrumb = new THREE.Mesh(new THREE.CylinderGeometry(0.46, 0.46, 0.012, 16), crumbMat);
  bottomCrumb.name = 'bottomCrumb';
  bottomCrumb.position.set(0, 0.14, 0);
  burger.add(bottomCrumb);
  const patty1 = new THREE.Mesh(jitter(new THREE.CylinderGeometry(0.52, 0.52, 0.13, 14, 2), 0.012, 11), pattyMat);
  patty1.name = 'patty1';
  patty1.position.set(0, 0.207, 0);
  burger.add(patty1);
  const cheese1 = new THREE.Mesh(new THREE.CylinderGeometry(0.47, 0.68, 0.07, 4, 1), cheeseMat);
  cheese1.name = 'cheese1';
  cheese1.position.set(0, 0.26, 0);
  cheese1.rotation.set(0, deg(45), 0);
  burger.add(cheese1);
  const tomato = new THREE.Mesh(new THREE.CylinderGeometry(0.48, 0.48, 0.055, 14), tomatoMat);
  tomato.name = 'tomato';
  tomato.position.set(0, 0.3205, 0);
  burger.add(tomato);
  const lettuce = new THREE.Mesh(jitter(extrude([[0.58, 0], [0.5086, 0.1081], [0.5299, 0.2359], [0.4207, 0.3056], [0.3881, 0.431], [0.26, 0.4503], [0.1792, 0.5516], [0.0544, 0.5172], [-0.0606, 0.5768], [-0.1607, 0.4945], [-0.29, 0.5023], [-0.3479, 0.3864], [-0.4692, 0.3409], [-0.475, 0.2115], [-0.5673, 0.1206], [-0.52, 0], [-0.5673, -0.1206], [-0.475, -0.2115], [-0.4692, -0.3409], [-0.3479, -0.3864], [-0.29, -0.5023], [-0.1607, -0.4945], [-0.0606, -0.5768], [0.0544, -0.5172], [0.1792, -0.5516], [0.26, -0.4503], [0.3881, -0.431], [0.4207, -0.3056], [0.5299, -0.2359], [0.5086, -0.1081]], 0.02), 0.022, 5), lettuceMat);
  lettuce.name = 'lettuce';
  lettuce.position.set(0, 0.353, 0);
  lettuce.rotation.set(deg(-90), 0, 0);
  burger.add(lettuce);
  const topBun = new THREE.Mesh(lathe([[0, 0.368], [0.46, 0.368], [0.5, 0.408], [0.515, 0.468], [0.49, 0.568], [0.42, 0.668], [0.3, 0.738], [0.15, 0.773], [0, 0.783]], 16), bunMat);
  topBun.name = 'topBun';
  burger.add(topBun);
  const seed1 = new THREE.Mesh(sphereGeo, seedMat);
  seed1.name = 'seed1';
  seed1.position.set(0.2936, 0.5507, -0.3977);
  seed1.rotation.set(deg(-72.7377), 0, deg(-35.183));
  seed1.scale.set(0.55, 0.4, 1);
  burger.add(seed1);
  const seed2 = new THREE.Mesh(sphereGeo, seedMat);
  seed2.name = 'seed2';
  seed2.position.set(0.2168, 0.5356, -0.4484);
  seed2.rotation.set(deg(-74.4809), 0, deg(-24.9776));
  seed2.scale.set(0.55, 0.4, 1);
  burger.add(seed2);
  const seed3 = new THREE.Mesh(sphereGeo, seedMat);
  seed3.name = 'seed3';
  seed3.position.set(-0.1434, 0.6898, -0.3547);
  seed3.rotation.set(deg(-28.4054), 0, deg(10.8847));
  seed3.scale.set(0.55, 0.4, 1);
  burger.add(seed3);
  const seed4 = new THREE.Mesh(sphereGeo, seedMat);
  seed4.name = 'seed4';
  seed4.position.set(0.4287, 0.5676, -0.2376);
  seed4.rotation.set(deg(-62.7188), 0, deg(-58.0527));
  seed4.scale.set(0.55, 0.4, 1);
  burger.add(seed4);
  const seed5 = new THREE.Mesh(sphereGeo, seedMat);
  seed5.name = 'seed5';
  seed5.position.set(-0.3362, 0.5327, -0.3685);
  seed5.rotation.set(deg(-71.3036), 0, deg(40.8334));
  seed5.scale.set(0.55, 0.4, 1);
  burger.add(seed5);
  const seed6 = new THREE.Mesh(sphereGeo, seedMat);
  seed6.name = 'seed6';
  seed6.position.set(-0.3365, 0.683, -0.2056);
  seed6.rotation.set(deg(-16.9156), 0, deg(25.466));
  seed6.scale.set(0.55, 0.4, 1);
  burger.add(seed6);
  const seed7 = new THREE.Mesh(sphereGeo, seedMat);
  seed7.name = 'seed7';
  seed7.position.set(0.4498, 0.5731, -0.1853);
  seed7.rotation.set(deg(-28.549), 0, deg(-49.2438));
  seed7.scale.set(0.55, 0.4, 1);
  burger.add(seed7);
  const seed8 = new THREE.Mesh(sphereGeo, seedMat);
  seed8.name = 'seed8';
  seed8.position.set(-0.0601, 0.5741, -0.482);
  seed8.rotation.set(deg(-54.8004), 0, deg(5.8135));
  seed8.scale.set(0.55, 0.4, 1);
  burger.add(seed8);
  const seed9 = new THREE.Mesh(sphereGeo, seedMat);
  seed9.name = 'seed9';
  seed9.position.set(-0.2814, 0.6681, 0.3115);
  seed9.rotation.set(deg(23.4048), 0, deg(19.7423));
  seed9.scale.set(0.55, 0.4, 1);
  burger.add(seed9);
  const seed10 = new THREE.Mesh(sphereGeo, seedMat);
  seed10.name = 'seed10';
  seed10.position.set(0.3515, 0.6399, -0.2641);
  seed10.rotation.set(deg(-40.6357), 0, deg(-40.9148));
  seed10.scale.set(0.55, 0.4, 1);
  burger.add(seed10);
  const seed11 = new THREE.Mesh(sphereGeo, seedMat);
  seed11.name = 'seed11';
  seed11.position.set(-0.3058, 0.7274, 0.0881);
  seed11.rotation.set(deg(9.1791), 0, deg(28.957));
  seed11.scale.set(0.55, 0.4, 1);
  burger.add(seed11);
  const seed12 = new THREE.Mesh(sphereGeo, seedMat);
  seed12.name = 'seed12';
  seed12.position.set(0.1161, 0.7295, 0.2923);
  seed12.rotation.set(deg(28.463), 0, deg(-10.7211));
  seed12.scale.set(0.55, 0.4, 1);
  burger.add(seed12);
  const seed13 = new THREE.Mesh(sphereGeo, seedMat);
  seed13.name = 'seed13';
  seed13.position.set(-0.2024, 0.6775, 0.3494);
  seed13.rotation.set(deg(26.783), 0, deg(14.6289));
  seed13.scale.set(0.55, 0.4, 1);
  burger.add(seed13);
  const seed14 = new THREE.Mesh(sphereGeo, seedMat);
  seed14.name = 'seed14';
  seed14.position.set(0.3595, 0.5107, -0.3537);
  seed14.rotation.set(deg(-70.3786), 0, deg(-43.7589));
  seed14.scale.set(0.55, 0.4, 1);
  burger.add(seed14);
  const seed15 = new THREE.Mesh(sphereGeo, seedMat);
  seed15.name = 'seed15';
  seed15.position.set(-0.4872, 0.5522, -0.0814);
  seed15.rotation.set(deg(-33.4001), 0, deg(73.1112));
  seed15.scale.set(0.55, 0.4, 1);
  burger.add(seed15);
  const seed16 = new THREE.Mesh(sphereGeo, seedMat);
  seed16.name = 'seed16';
  seed16.position.set(0.3989, 0.6289, 0.2024);
  seed16.rotation.set(deg(32.8806), 0, deg(-46.933));
  seed16.scale.set(0.55, 0.4, 1);
  burger.add(seed16);
  const seed17 = new THREE.Mesh(sphereGeo, seedMat);
  seed17.name = 'seed17';
  seed17.position.set(-0.0953, 0.7191, -0.3185);
  seed17.rotation.set(deg(-29.1986), 0, deg(8.3053));
  seed17.scale.set(0.55, 0.4, 1);
  burger.add(seed17);
  const seed18 = new THREE.Mesh(sphereGeo, seedMat);
  seed18.name = 'seed18';
  seed18.position.set(0.4496, 0.5502, 0.2058);
  seed18.rotation.set(deg(59.0121), 0, deg(-61.8959));
  seed18.scale.set(0.55, 0.4, 1);
  burger.add(seed18);
  const seed19 = new THREE.Mesh(sphereGeo, seedMat);
  seed19.name = 'seed19';
  seed19.position.set(-0.1643, 0.6275, 0.4172);
  seed19.rotation.set(deg(53.0455), 0, deg(17.4663));
  seed19.scale.set(0.55, 0.4, 1);
  burger.add(seed19);
  const seed20 = new THREE.Mesh(sphereGeo, seedMat);
  seed20.name = 'seed20';
  seed20.position.set(-0.1079, 0.6726, 0.3978);
  seed20.rotation.set(deg(29.3792), 0, deg(7.5791));
  seed20.scale.set(0.55, 0.4, 1);
  burger.add(seed20);

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

export default createBurger;