/**
 * Landmine — Codels 3D model library
 * License: CC0-1.0 · Units: meters · Y-up · Front: +Z · Origin: center of the base (y = 0)
 * Triangles: 878 · Size (W × H × D): 0.96 × 0.41 × 0.93 m
 *
 * Usage:
 *   import { createLandmine } from './landmine.js';
 *   
 *   const model = createLandmine();
 *   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 createLandmine() {
  const root = new THREE.Group();
  root.name = 'Landmine';

  // Materials
  const casingMat = new THREE.MeshStandardMaterial({ name: 'casing', color: 0x6b7a3a, roughness: 0.6, metalness: 0.25, flatShading: true });
  const casingDarkMat = new THREE.MeshStandardMaterial({ name: 'casingDark', color: 0x464f26, roughness: 0.65, metalness: 0.3, flatShading: true });
  const steelMat = new THREE.MeshStandardMaterial({ name: 'steel', color: 0x9aa2ad, roughness: 0.35, metalness: 0.75, flatShading: true });
  const hazardMat = new THREE.MeshStandardMaterial({ name: 'hazard', color: 0xf5c02a, roughness: 0.55, flatShading: true });
  const stripeMat = new THREE.MeshStandardMaterial({ name: 'stripe', color: 0x1d1f25, roughness: 0.7, flatShading: true });
  const lightMat = new THREE.MeshStandardMaterial({ name: 'light', color: 0xff5a4a, roughness: 0.3, emissive: 0xff2a1a, emissiveIntensity: 1.4, flatShading: true });
  const dirtMat = new THREE.MeshStandardMaterial({ name: 'dirt', color: 0x6a4a2c, roughness: 1, flatShading: true });
  const dirtDarkMat = new THREE.MeshStandardMaterial({ name: 'dirtDark', color: 0x4e3520, roughness: 1, flatShading: true });

  // Shared geometries
  const boxGeo = new THREE.BoxGeometry(0.26, 0.012, 0.025);
  const cylinderGeo = new THREE.CylinderGeometry(0.014, 0.014, 0.012, 6);

  // Parts
  const mound = new THREE.Mesh(jitter(new THREE.SphereGeometry(0.48, 10, 3, 0, Math.PI * 2, 0, Math.PI / 2), 0.012, 4), dirtMat);
  mound.name = 'mound';
  mound.scale.set(1, 0.26, 1);
  root.add(mound);
  const dodecahedron2 = new THREE.Mesh(jitter(new THREE.DodecahedronGeometry(0.0364, 0), 0.0073, 2), dirtMat);
  dodecahedron2.position.set(0.3622, 0.0371, 0.0481);
  root.add(dodecahedron2);
  const dodecahedron3 = new THREE.Mesh(jitter(new THREE.DodecahedronGeometry(0.037, 0), 0.0074, 3), dirtDarkMat);
  dodecahedron3.position.set(0.3737, 0.033, 0.2797);
  root.add(dodecahedron3);
  const dodecahedron4 = new THREE.Mesh(jitter(new THREE.DodecahedronGeometry(0.0316, 0), 0.0063, 4), dirtMat);
  dodecahedron4.position.set(-0.0822, 0.0331, 0.3737);
  root.add(dodecahedron4);
  const dodecahedron5 = new THREE.Mesh(jitter(new THREE.DodecahedronGeometry(0.0271, 0), 0.0054, 5), dirtDarkMat);
  dodecahedron5.position.set(-0.3541, 0.0301, 0.1569);
  root.add(dodecahedron5);
  const dodecahedron6 = new THREE.Mesh(jitter(new THREE.DodecahedronGeometry(0.0448, 0), 0.009, 6), dirtMat);
  dodecahedron6.position.set(-0.3576, 0.0456, -0.2328);
  root.add(dodecahedron6);
  const dodecahedron7 = new THREE.Mesh(jitter(new THREE.DodecahedronGeometry(0.0423, 0), 0.0085, 7), dirtDarkMat);
  dodecahedron7.position.set(0.0014, 0.0446, -0.4053);
  root.add(dodecahedron7);
  const dodecahedron8 = new THREE.Mesh(jitter(new THREE.DodecahedronGeometry(0.0382, 0), 0.0076, 8), dirtMat);
  dodecahedron8.position.set(0.2355, 0.0336, -0.3883);
  root.add(dodecahedron8);
  const casing = new THREE.Mesh(new THREE.CylinderGeometry(0.24, 0.255, 0.15, 12), casingMat);
  casing.name = 'casing';
  casing.position.set(0, 0.105, 0);
  root.add(casing);
  const rim = new THREE.Mesh(new THREE.CylinderGeometry(0.26, 0.26, 0.03, 12), casingDarkMat);
  rim.name = 'rim';
  rim.position.set(0, 0.171, 0);
  root.add(rim);
  const cylinder11 = new THREE.Mesh(new THREE.CylinderGeometry(0.262, 0.262, 0.045, 2, 1, true, 0, Math.PI / 6), hazardMat);
  cylinder11.position.set(0, 0.115, 0);
  root.add(cylinder11);
  const cylinder12 = new THREE.Mesh(new THREE.CylinderGeometry(0.262, 0.262, 0.045, 2, 1, true, Math.PI / 6, Math.PI / 6), stripeMat);
  cylinder12.position.set(0, 0.115, 0);
  root.add(cylinder12);
  const cylinder13 = new THREE.Mesh(new THREE.CylinderGeometry(0.262, 0.262, 0.045, 2, 1, true, Math.PI / 3, Math.PI / 6), hazardMat);
  cylinder13.position.set(0, 0.115, 0);
  root.add(cylinder13);
  const cylinder14 = new THREE.Mesh(new THREE.CylinderGeometry(0.262, 0.262, 0.045, 2, 1, true, Math.PI / 2, Math.PI / 6), stripeMat);
  cylinder14.position.set(0, 0.115, 0);
  root.add(cylinder14);
  const cylinder15 = new THREE.Mesh(new THREE.CylinderGeometry(0.262, 0.262, 0.045, 2, 1, true, Math.PI * 0.6667, Math.PI / 6), hazardMat);
  cylinder15.position.set(0, 0.115, 0);
  root.add(cylinder15);
  const cylinder16 = new THREE.Mesh(new THREE.CylinderGeometry(0.262, 0.262, 0.045, 2, 1, true, Math.PI * 0.8333, Math.PI / 6), stripeMat);
  cylinder16.position.set(0, 0.115, 0);
  root.add(cylinder16);
  const cylinder17 = new THREE.Mesh(new THREE.CylinderGeometry(0.262, 0.262, 0.045, 2, 1, true, Math.PI, Math.PI / 6), hazardMat);
  cylinder17.position.set(0, 0.115, 0);
  root.add(cylinder17);
  const cylinder18 = new THREE.Mesh(new THREE.CylinderGeometry(0.262, 0.262, 0.045, 2, 1, true, Math.PI * 1.1667, Math.PI / 6), stripeMat);
  cylinder18.position.set(0, 0.115, 0);
  root.add(cylinder18);
  const cylinder19 = new THREE.Mesh(new THREE.CylinderGeometry(0.262, 0.262, 0.045, 2, 1, true, Math.PI * 1.3333, Math.PI / 6), hazardMat);
  cylinder19.position.set(0, 0.115, 0);
  root.add(cylinder19);
  const cylinder20 = new THREE.Mesh(new THREE.CylinderGeometry(0.262, 0.262, 0.045, 2, 1, true, Math.PI * 1.5, Math.PI / 6), stripeMat);
  cylinder20.position.set(0, 0.115, 0);
  root.add(cylinder20);
  const cylinder21 = new THREE.Mesh(new THREE.CylinderGeometry(0.262, 0.262, 0.045, 2, 1, true, Math.PI * 1.6667, Math.PI / 6), hazardMat);
  cylinder21.position.set(0, 0.115, 0);
  root.add(cylinder21);
  const cylinder22 = new THREE.Mesh(new THREE.CylinderGeometry(0.262, 0.262, 0.045, 2, 1, true, Math.PI * 1.8333, Math.PI / 6), stripeMat);
  cylinder22.position.set(0, 0.115, 0);
  root.add(cylinder22);
  const pressurePlate = new THREE.Mesh(new THREE.CylinderGeometry(0.15, 0.16, 0.035, 12), casingDarkMat);
  pressurePlate.name = 'pressurePlate';
  pressurePlate.position.set(0, 0.1975, 0);
  root.add(pressurePlate);
  const box24 = new THREE.Mesh(boxGeo, casingMat);
  box24.position.set(0, 0.221, 0);
  root.add(box24);
  const box25 = new THREE.Mesh(boxGeo, casingMat);
  box25.position.set(0, 0.221, 0);
  box25.rotation.set(0, deg(30), 0);
  root.add(box25);
  const box26 = new THREE.Mesh(boxGeo, casingMat);
  box26.position.set(0, 0.221, 0);
  box26.rotation.set(0, deg(60), 0);
  root.add(box26);
  const box27 = new THREE.Mesh(boxGeo, casingMat);
  box27.position.set(0, 0.221, 0);
  box27.rotation.set(0, deg(90), 0);
  root.add(box27);
  const box28 = new THREE.Mesh(boxGeo, casingMat);
  box28.position.set(0, 0.221, 0);
  box28.rotation.set(0, deg(120), 0);
  root.add(box28);
  const box29 = new THREE.Mesh(boxGeo, casingMat);
  box29.position.set(0, 0.221, 0);
  box29.rotation.set(0, deg(150), 0);
  root.add(box29);
  const cylinder30 = new THREE.Mesh(cylinderGeo, steelMat);
  cylinder30.position.set(0.1775, 0.192, 0.1025);
  root.add(cylinder30);
  const cylinder31 = new THREE.Mesh(cylinderGeo, steelMat);
  cylinder31.position.set(0, 0.192, 0.205);
  root.add(cylinder31);
  const cylinder32 = new THREE.Mesh(cylinderGeo, steelMat);
  cylinder32.position.set(-0.1775, 0.192, 0.1025);
  root.add(cylinder32);
  const cylinder33 = new THREE.Mesh(cylinderGeo, steelMat);
  cylinder33.position.set(-0.1775, 0.192, -0.1025);
  root.add(cylinder33);
  const cylinder34 = new THREE.Mesh(cylinderGeo, steelMat);
  cylinder34.position.set(0, 0.192, -0.205);
  root.add(cylinder34);
  const cylinder35 = new THREE.Mesh(cylinderGeo, steelMat);
  cylinder35.position.set(0.1775, 0.192, -0.1025);
  root.add(cylinder35);
  const fuseCap = new THREE.Mesh(new THREE.CylinderGeometry(0.035, 0.045, 0.035, 8), steelMat);
  fuseCap.name = 'fuseCap';
  fuseCap.position.set(0, 0.2445, 0);
  root.add(fuseCap);
  const stalk = new THREE.Mesh(new THREE.CylinderGeometry(0.014, 0.014, 0.06, 6), steelMat);
  stalk.name = 'stalk';
  stalk.position.set(0, 0.292, 0);
  root.add(stalk);
  const bulbSocket = new THREE.Mesh(new THREE.CylinderGeometry(0.042, 0.03, 0.02, 8), casingDarkMat);
  bulbSocket.name = 'bulbSocket';
  bulbSocket.position.set(0, 0.327, 0);
  root.add(bulbSocket);
  const light = new THREE.Mesh(new THREE.SphereGeometry(0.042, 8, 6), lightMat);
  light.name = 'light';
  light.position.set(0, 0.367, 0);
  root.add(light);

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

export default createLandmine;