/**
 * Road T-Junction — Codels 3D model library
 * License: CC0-1.0 · Units: meters · Y-up · Front: +Z · Origin: center of the base (y = 0)
 * Triangles: 528 · Size (W × H × D): 4.00 × 0.17 × 4.00 m
 *
 * Usage:
 *   import { createRoadTJunction } from './road-t-junction.js';
 *   
 *   const model = createRoadTJunction();
 *   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 createRoadTJunction() {
  const root = new THREE.Group();
  root.name = 'RoadTJunction';

  // Materials
  const asphaltMat = new THREE.MeshStandardMaterial({ name: 'asphalt', color: 0x41454b, roughness: 0.95, flatShading: true });
  const whiteMat = new THREE.MeshStandardMaterial({ name: 'white', color: 0xecebe4, roughness: 0.7, flatShading: true });
  const yellowMat = new THREE.MeshStandardMaterial({ name: 'yellow', color: 0xe9b72c, roughness: 0.7, flatShading: true });
  const curbMat = new THREE.MeshStandardMaterial({ name: 'curb', color: 0xb4b2ab, roughness: 0.9, flatShading: true });
  const paverMat = new THREE.MeshStandardMaterial({ name: 'paver', color: 0x92918b, roughness: 0.95, flatShading: true });
  const baseMat = new THREE.MeshStandardMaterial({ name: 'base', color: 0x64635f, roughness: 1, flatShading: true });
  const grateMat = new THREE.MeshStandardMaterial({ name: 'grate', color: 0x26292c, roughness: 0.6, metalness: 0.5, flatShading: true });

  // Shared geometries
  const boxGeo = new THREE.BoxGeometry(0.1, 0.006, 0.65);
  const boxGeo2 = new THREE.BoxGeometry(0.11, 0.006, 1);
  const boxGeo3 = new THREE.BoxGeometry(0.1, 0.006, 0.45);
  const boxGeo4 = new THREE.BoxGeometry(0.498, 0.02, 0.988);
  const boxGeo5 = new THREE.BoxGeometry(0.24, 0.006, 0.035);
  const extrudeGeo = extrude([[1.35, 2], [1.35, 1.65], [1.3728, 1.5352], [1.4379, 1.4379], [1.5352, 1.3728], [1.65, 1.35], [2, 1.35], [2, 1.49], [1.65, 1.49], [1.5888, 1.5022], [1.5369, 1.5369], [1.5022, 1.5888], [1.49, 1.65], [1.49, 2]], 0.165);
  const extrudeGeo2 = extrude([[1.49, 2], [1.49, 1.65], [1.5022, 1.5888], [1.5369, 1.5369], [1.5888, 1.5022], [1.65, 1.49], [2, 1.49], [2, 2]], 0.13);
  const extrudeGeo3 = extrude([[1.496, 1.994], [1.496, 1.65], [1.5077, 1.5911], [1.5411, 1.5411], [1.5911, 1.5077], [1.65, 1.496], [1.994, 1.496], [1.994, 1.994]], 0.02);

  // Parts
  const asphalt = new THREE.Mesh(extrude([[1.35, 2], [1.35, 1.65], [1.3728, 1.5352], [1.4379, 1.4379], [1.5352, 1.3728], [1.65, 1.35], [2, 1.35], [2, -1.35], [-2, -1.35], [-2, 1.35], [-1.65, 1.35], [-1.5352, 1.3728], [-1.4379, 1.4379], [-1.3728, 1.5352], [-1.35, 1.65], [-1.35, 2]], 0.02), asphaltMat);
  asphalt.name = 'asphalt';
  asphalt.position.set(0, 0.01, 0);
  asphalt.rotation.set(deg(90), 0, 0);
  root.add(asphalt);
  const mainMarkings = new THREE.Group();
  mainMarkings.name = 'mainMarkings';
  mainMarkings.rotation.set(0, deg(90), 0);
  root.add(mainMarkings);
  const edgeLine = new THREE.Mesh(new THREE.BoxGeometry(0.1, 0.006, 4), whiteMat);
  edgeLine.name = 'edgeLine';
  edgeLine.position.set(0.93, 0.022, 0);
  mainMarkings.add(edgeLine);
  const edgeLine2 = new THREE.Mesh(boxGeo, whiteMat);
  edgeLine2.name = 'edgeLine';
  edgeLine2.position.set(-0.93, 0.022, -1.675);
  mainMarkings.add(edgeLine2);
  const edgeLine3 = new THREE.Mesh(boxGeo, whiteMat);
  edgeLine3.name = 'edgeLine';
  edgeLine3.position.set(-0.93, 0.022, 1.675);
  mainMarkings.add(edgeLine3);
  const centerDash = new THREE.Mesh(boxGeo2, yellowMat);
  centerDash.name = 'centerDash';
  centerDash.position.set(0, 0.022, -1);
  mainMarkings.add(centerDash);
  const centerDash2 = new THREE.Mesh(boxGeo2, yellowMat);
  centerDash2.name = 'centerDash';
  centerDash2.position.set(0, 0.022, 1);
  mainMarkings.add(centerDash2);
  const sideArm = new THREE.Group();
  sideArm.name = 'sideArm';
  root.add(sideArm);
  const stopLine = new THREE.Mesh(new THREE.BoxGeometry(0.895, 0.006, 0.1), whiteMat);
  stopLine.name = 'stopLine';
  stopLine.position.set(0.5325, 0.022, 1.5);
  sideArm.add(stopLine);
  const centerLine = new THREE.Mesh(new THREE.BoxGeometry(0.11, 0.006, 0.45), yellowMat);
  centerLine.name = 'centerLine';
  centerLine.position.set(0, 0.022, 1.775);
  sideArm.add(centerLine);
  const edgeLine4 = new THREE.Mesh(boxGeo3, whiteMat);
  edgeLine4.name = 'edgeLine';
  edgeLine4.position.set(-0.93, 0.022, 1.775);
  sideArm.add(edgeLine4);
  const edgeLine5 = new THREE.Mesh(boxGeo3, whiteMat);
  edgeLine5.name = 'edgeLine';
  edgeLine5.position.set(0.93, 0.022, 1.775);
  sideArm.add(edgeLine5);
  const sidewalk = new THREE.Group();
  sidewalk.name = 'sidewalk';
  sidewalk.rotation.set(0, deg(90), 0);
  root.add(sidewalk);
  const curb = new THREE.Mesh(new THREE.BoxGeometry(0.14, 0.165, 4), curbMat);
  curb.name = 'curb';
  curb.position.set(1.42, 0.0825, 0);
  sidewalk.add(curb);
  const sidewalkBase = new THREE.Mesh(new THREE.BoxGeometry(0.51, 0.13, 4), baseMat);
  sidewalkBase.name = 'sidewalkBase';
  sidewalkBase.position.set(1.745, 0.065, 0);
  sidewalk.add(sidewalkBase);
  const paver = new THREE.Mesh(boxGeo4, paverMat);
  paver.name = 'paver';
  paver.position.set(1.745, 0.14, -1.5);
  sidewalk.add(paver);
  const paver2 = new THREE.Mesh(boxGeo4, paverMat);
  paver2.name = 'paver';
  paver2.position.set(1.745, 0.14, -0.5);
  sidewalk.add(paver2);
  const paver3 = new THREE.Mesh(boxGeo4, paverMat);
  paver3.name = 'paver';
  paver3.position.set(1.745, 0.14, 0.5);
  sidewalk.add(paver3);
  const paver4 = new THREE.Mesh(boxGeo4, paverMat);
  paver4.name = 'paver';
  paver4.position.set(1.745, 0.14, 1.5);
  sidewalk.add(paver4);
  const drainGrate = new THREE.Mesh(new THREE.BoxGeometry(0.3, 0.012, 0.6), grateMat);
  drainGrate.name = 'drainGrate';
  drainGrate.position.set(1.17, 0.022, -1);
  sidewalk.add(drainGrate);
  const grateBar = new THREE.Mesh(boxGeo5, baseMat);
  grateBar.name = 'grateBar';
  grateBar.position.set(1.17, 0.028, -1.22);
  sidewalk.add(grateBar);
  const grateBar2 = new THREE.Mesh(boxGeo5, baseMat);
  grateBar2.name = 'grateBar';
  grateBar2.position.set(1.17, 0.028, -1.11);
  sidewalk.add(grateBar2);
  const grateBar3 = new THREE.Mesh(boxGeo5, baseMat);
  grateBar3.name = 'grateBar';
  grateBar3.position.set(1.17, 0.028, -1);
  sidewalk.add(grateBar3);
  const grateBar4 = new THREE.Mesh(boxGeo5, baseMat);
  grateBar4.name = 'grateBar';
  grateBar4.position.set(1.17, 0.028, -0.89);
  sidewalk.add(grateBar4);
  const grateBar5 = new THREE.Mesh(boxGeo5, baseMat);
  grateBar5.name = 'grateBar';
  grateBar5.position.set(1.17, 0.028, -0.78);
  sidewalk.add(grateBar5);
  const cornerRight = new THREE.Group();
  cornerRight.name = 'cornerRight';
  root.add(cornerRight);
  const curb2 = new THREE.Mesh(extrudeGeo, curbMat);
  curb2.name = 'curb';
  curb2.position.set(0, 0.0825, 0);
  curb2.rotation.set(deg(90), 0, 0);
  cornerRight.add(curb2);
  const sidewalkBase2 = new THREE.Mesh(extrudeGeo2, baseMat);
  sidewalkBase2.name = 'sidewalkBase';
  sidewalkBase2.position.set(0, 0.065, 0);
  sidewalkBase2.rotation.set(deg(90), 0, 0);
  cornerRight.add(sidewalkBase2);
  const paver5 = new THREE.Mesh(extrudeGeo3, paverMat);
  paver5.name = 'paver';
  paver5.position.set(0, 0.14, 0);
  paver5.rotation.set(deg(90), 0, 0);
  cornerRight.add(paver5);
  const cornerLeft = new THREE.Group();
  cornerLeft.name = 'cornerLeft';
  cornerLeft.rotation.set(0, deg(270), 0);
  root.add(cornerLeft);
  const curb3 = new THREE.Mesh(extrudeGeo, curbMat);
  curb3.name = 'curb';
  curb3.position.set(0, 0.0825, 0);
  curb3.rotation.set(deg(90), 0, 0);
  cornerLeft.add(curb3);
  const sidewalkBase3 = new THREE.Mesh(extrudeGeo2, baseMat);
  sidewalkBase3.name = 'sidewalkBase';
  sidewalkBase3.position.set(0, 0.065, 0);
  sidewalkBase3.rotation.set(deg(90), 0, 0);
  cornerLeft.add(sidewalkBase3);
  const paver6 = new THREE.Mesh(extrudeGeo3, paverMat);
  paver6.name = 'paver';
  paver6.position.set(0, 0.14, 0);
  paver6.rotation.set(deg(90), 0, 0);
  cornerLeft.add(paver6);

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

export default createRoadTJunction;