/**
 * Bread — Codels 3D model library
 * License: CC0-1.0 · Units: meters · Y-up · Front: +Z · Origin: center of the base (y = 0)
 * Triangles: 368 · Size (W × H × D): 0.14 × 0.13 × 0.23 m
 *
 * Usage:
 *   import { createBread } from './bread.js';
 *   
 *   const model = createBread();
 *   model.position.set(0, 0, 0);
 *   scene.add(model);
 */
import * as THREE from 'three';

const deg = THREE.MathUtils.degToRad;

// 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 createBread() {
  const root = new THREE.Group();
  root.name = 'Bread';

  // Materials
  const crustMat = new THREE.MeshStandardMaterial({ name: 'crust', color: 0xc98339, roughness: 0.75, flatShading: true });
  const darkMat = new THREE.MeshStandardMaterial({ name: 'dark', color: 0x9d662c, roughness: 0.8, flatShading: true });
  const crumbMat = new THREE.MeshStandardMaterial({ name: 'crumb', color: 0xf0d2a5, roughness: 0.9, flatShading: true });

  // Shared geometries
  const sphereGeo = new THREE.SphereGeometry(1, 8, 4);

  // Parts
  const loaf = new THREE.Group();
  loaf.name = 'loaf';
  root.add(loaf);
  const loafBody = new THREE.Mesh(extrude([[-0.05, 0], [0.05, 0], [0.053, 0.05], [0.06, 0.064], [0.061, 0.078], [0.052, 0.094], [0.034, 0.104], [0.012, 0.108], [-0.012, 0.108], [-0.034, 0.104], [-0.052, 0.094], [-0.061, 0.078], [-0.06, 0.064], [-0.053, 0.05]], 0.2, [], [0.014, 0.008, 2]), crustMat);
  loafBody.name = 'loafBody';
  loafBody.position.set(0, 0.008, 0);
  loaf.add(loafBody);
  const tinLine = new THREE.Mesh(new THREE.BoxGeometry(0.124, 0.006, 0.226), darkMat);
  tinLine.name = 'tinLine';
  tinLine.position.set(0, 0.062, 0);
  loaf.add(tinLine);
  const score1 = new THREE.Mesh(sphereGeo, crumbMat);
  score1.name = 'score1';
  score1.position.set(0, 0.121, -0.075);
  score1.rotation.set(0, deg(28), 0);
  score1.scale.set(0.036, 0.006, 0.008);
  loaf.add(score1);
  const score2 = new THREE.Mesh(sphereGeo, crumbMat);
  score2.name = 'score2';
  score2.position.set(0, 0.121, -0.025);
  score2.rotation.set(0, deg(28), 0);
  score2.scale.set(0.036, 0.006, 0.008);
  loaf.add(score2);
  const score3 = new THREE.Mesh(sphereGeo, crumbMat);
  score3.name = 'score3';
  score3.position.set(0, 0.121, 0.025);
  score3.rotation.set(0, deg(28), 0);
  score3.scale.set(0.036, 0.006, 0.008);
  loaf.add(score3);
  const score4 = new THREE.Mesh(sphereGeo, crumbMat);
  score4.name = 'score4';
  score4.position.set(0, 0.121, 0.075);
  score4.rotation.set(0, deg(28), 0);
  score4.scale.set(0.036, 0.006, 0.008);
  loaf.add(score4);

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

export default createBread;