/**
 * Sword — Codels 3D model library
 * License: CC0-1.0 · Units: meters · Y-up · Front: +Z · Origin: center of the base (y = 0)
 * Triangles: 468 · Size (W × H × D): 0.29 × 1.03 × 0.06 m
 *
 * Usage:
 *   import { createSword } from './sword.js';
 *   
 *   const model = createSword();
 *   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 createSword() {
  const root = new THREE.Group();
  root.name = 'Sword';

  // Materials
  const bladeMat = new THREE.MeshStandardMaterial({ name: 'blade', color: 0xd9e1ea, roughness: 0.3, metalness: 0.7, flatShading: true });
  const hiltMat = new THREE.MeshStandardMaterial({ name: 'hilt', color: 0xd0a24a, roughness: 0.35, metalness: 0.75, flatShading: true });
  const gripMat = new THREE.MeshStandardMaterial({ name: 'grip', color: 0x6b4226, roughness: 0.85, flatShading: true });
  const wrapMat = new THREE.MeshStandardMaterial({ name: 'wrap', color: 0x3f2516, roughness: 0.9, flatShading: true });

  // Shared geometries
  const cylinderGeo = new THREE.CylinderGeometry(0.0205, 0.0205, 0.01, 8);
  const sphereGeo = new THREE.SphereGeometry(0.02, 6, 4);

  // Parts
  const pommel = new THREE.Mesh(new THREE.SphereGeometry(0.038, 8, 6), hiltMat);
  pommel.name = 'pommel';
  pommel.position.set(0, 0.035, 0);
  pommel.scale.set(1, 0.92, 0.78);
  root.add(pommel);
  const pommelNeck = new THREE.Mesh(new THREE.CylinderGeometry(0.016, 0.022, 0.02, 8), hiltMat);
  pommelNeck.name = 'pommelNeck';
  pommelNeck.position.set(0, 0.072, 0);
  root.add(pommelNeck);
  const grip = new THREE.Mesh(new THREE.CylinderGeometry(0.0185, 0.0175, 0.16, 8), gripMat);
  grip.name = 'grip';
  grip.position.set(0, 0.158, 0);
  root.add(grip);
  const wrap1 = new THREE.Mesh(cylinderGeo, wrapMat);
  wrap1.name = 'wrap1';
  wrap1.position.set(0, 0.0913, 0);
  wrap1.rotation.set(0, 0, deg(16));
  root.add(wrap1);
  const wrap2 = new THREE.Mesh(cylinderGeo, wrapMat);
  wrap2.name = 'wrap2';
  wrap2.position.set(0, 0.118, 0);
  wrap2.rotation.set(0, 0, deg(16));
  root.add(wrap2);
  const wrap3 = new THREE.Mesh(cylinderGeo, wrapMat);
  wrap3.name = 'wrap3';
  wrap3.position.set(0, 0.1447, 0);
  wrap3.rotation.set(0, 0, deg(16));
  root.add(wrap3);
  const wrap4 = new THREE.Mesh(cylinderGeo, wrapMat);
  wrap4.name = 'wrap4';
  wrap4.position.set(0, 0.1713, 0);
  wrap4.rotation.set(0, 0, deg(16));
  root.add(wrap4);
  const wrap5 = new THREE.Mesh(cylinderGeo, wrapMat);
  wrap5.name = 'wrap5';
  wrap5.position.set(0, 0.198, 0);
  wrap5.rotation.set(0, 0, deg(16));
  root.add(wrap5);
  const wrap6 = new THREE.Mesh(cylinderGeo, wrapMat);
  wrap6.name = 'wrap6';
  wrap6.position.set(0, 0.2247, 0);
  wrap6.rotation.set(0, 0, deg(16));
  root.add(wrap6);
  const guard = new THREE.Mesh(new THREE.BoxGeometry(0.24, 0.0289, 0.04), hiltMat);
  guard.name = 'guard';
  guard.position.set(0, 0.255, 0);
  root.add(guard);
  const guardEndR = new THREE.Mesh(sphereGeo, hiltMat);
  guardEndR.name = 'guardEndR';
  guardEndR.position.set(0.125, 0.255, 0);
  root.add(guardEndR);
  const guardEndL = new THREE.Mesh(sphereGeo, hiltMat);
  guardEndL.name = 'guardEndL';
  guardEndL.position.set(-0.125, 0.255, 0);
  root.add(guardEndL);
  const guardCenter = new THREE.Mesh(new THREE.BoxGeometry(0.05, 0.05, 0.048), hiltMat);
  guardCenter.name = 'guardCenter';
  guardCenter.position.set(0, 0.255, 0);
  guardCenter.rotation.set(0, 0, deg(45));
  root.add(guardCenter);
  const blade = new THREE.Mesh(extrude([[-0.013, 0], [0.013, 0], [0.007, 0.615], [0, 0.7284], [-0.007, 0.615]], 0.001, [], [0.0045, 0.018, 1]), bladeMat);
  blade.name = 'blade';
  blade.position.set(0, 0.273, 0);
  root.add(blade);

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

export default createSword;