//import {  } from './cloth.js';
//import { OrbitControls } from './OrbitControls.js';

function addLights(scene){
  scene.add( new THREE.AmbientLight( 0x222222 ) );

  const light1 = new THREE.PointLight( 0xffffff, 1, 50 );
  light1.position.set( 15, 1, 40 );
  scene.add( light1 );

  const light2 = new THREE.PointLight( 0xffffff, 1, 50 );
  light2.position.set( -15, 0, 40 );
  scene.add( light2 );

  const light3 = new THREE.PointLight( 0xffffff, 1, 50 );
  light3.position.set( 0, -1, 40 );
  scene.add( light3 );
}

/**
 * setup THREE JS Scene, Camera and Renderer
 */
function setup_scene(canvasSpace) {
  const scene = new THREE.Scene();
  const camera = new THREE.PerspectiveCamera(75, window.innerWidth / (window.innerHeight - canvasSpace), 0.1, 1000);
  const renderer = new THREE.WebGLRenderer();
  /** size canvas to leave some space for UI */
  renderer.setSize(window.innerWidth, window.innerHeight - canvasSpace);
  renderer.antialias = true;
  /** embed canvas in HTML */
  document.getElementById("threejscontainer").appendChild(renderer.domElement);

  /** add orbit controls */
  const controls = new THREE.OrbitControls(camera, renderer.domElement);
  controls.target.set(0, 0, 0);
  controls.update();

  /** add scene background */
  const loader = new THREE.TextureLoader();
  const texture = loader.load(
    'Textures/tears_of_steel_bridge_2k.jpg',
    () => {
      const rt = new THREE.WebGLCubeRenderTarget(texture.image.height);
      rt.fromEquirectangularTexture(renderer, texture);
      scene.background = rt;
    });

  /** add flag pole */
  const geometry = new THREE.CylinderGeometry( 0.02, 0.02, 5, 32 );
  const material = new THREE.MeshStandardMaterial( {color: 0xffffff} );
  const cylinder = new THREE.Mesh( geometry, material );
  cylinder.position.set(-0.5, -2.25, 0);
  scene.add( cylinder );

  /** add global light */
  const directionalLight = new THREE.DirectionalLight(0xffffff, 1);
  scene.add(directionalLight);

  /** position camera */
  camera.position.z = 2;
  addLights(scene);
  return [scene, camera, renderer];
}

/** call "init" when document is fully loaded */
document.body.onload = init;

function init() {
  let mousePos = new THREE.Vector2();
  
  /**
   * Space left empty under canvas
   * for UI elements
   */
  const canvasSpace = 200;

  /** Constant Frame Time */
  const frameTime = 1000.0 / 60.0;

  /** Setup scene */
  let [scene, camera, renderer] = setup_scene(canvasSpace);

  // Add Cloth Initialization
  
  let raycaster = new THREE.Raycaster();
  let intersects;
  let rightMousePressed;
  /**
   * function called every frame
   * @param {number} dt - time passed since last frame in ms
   */
  function animate(dt) {
    // simulate cloth
    
    raycaster.setFromCamera( new THREE.Vector2((mousePos.x / w) * 2 - 1, ((h - mousePos.y) / h) * 2 - 1), camera );

    // intersects = raycaster.intersectObject( mesh );

    // if ( intersects.length > 0 && rightMousePressed) {
    //   // Cloth mouse interaction
    // }
    setTimeout(() => {
      animate(frameTime);
    }, frameTime);
    renderer.render(scene, camera);
  }


  /** add callback for window resize */
  let canvas = document.getElementsByTagName("canvas")[0];
  let w = window.innerWidth;
  let h = window.innerHeight - canvasSpace;
  let resize = function () {
    w = window.innerWidth;
    h = window.innerHeight - canvasSpace;
    canvas.width = w;
    canvas.height = h;
  }
  window.onresize = resize;
  resize();

  /**
   * if canvas has been successfully initialized
   * start rendering
   */
  if (canvas.getContext) {
    animate(performance.now());
  }

  

  /** add mouse move callback */
  canvas.onmousemove = (evt) => {
    mousePos.x = evt.clientX;
    mousePos.y = evt.clientY;

    //cloth.mouseMove(calculateMousePosToWorld(evt));
  };

  /**
   * Prevent context menu while blowing wind
   */
  canvas.addEventListener('contextmenu', function(evt) { 
    evt.preventDefault();
  }, false);


  canvas.onmousedown = (evt) => {

    // Check mouse click
    rightMousePressed = evt.button == 2;
    
    if(intersects.length > 0 && evt.button == 0){
      //cloth.mousePress(intersects);
    } 
  }
  
  canvas.onmouseup = (evt) => {
    //cloth.mouseRelease();
    rightMousePressed = false;
  }

  function calculateMousePosToWorld(evt){
    var vec = new THREE.Vector3(); // create once and reuse
    var pos = new THREE.Vector3(); // create once and reuse

    vec.set(
      ( evt.clientX / window.innerWidth ) * 2 - 1,
    - ( evt.clientY / window.innerHeight ) * 2 + 1,
      0.5 );

    vec.unproject( camera );

    vec.sub( camera.position ).normalize();

    var distance = - camera.position.z / vec.z;

    pos.copy( camera.position ).add( vec.multiplyScalar( distance ) );
    return pos;
  }
}