import THREE from 'THREE';
import { debounce } from './utils';

let raycaster = new THREE.Raycaster();

export function setEvents(camera, elem,items, type, wait) {

  let listener = function(event) {
	
    let mouse = {    //-1更利于手指点击
      x: ((event.clientX  - 4 ) / event.target.clientWidth ) * 2 - 1,
      y: -((event.clientY  - 4 ) / event.target.clientHeight) * 2 + 1
    };
	
	let vector = new THREE.Vector3();
    vector.set(mouse.x, mouse.y, 0.5);
    vector.unproject(camera);

    raycaster.ray.set(camera.position, vector.sub(camera.position).normalize());
//console.log(event.type + ": " +mouse.x+", " +mouse.y);
//console.log(event.type + ": " +event.offsetX+", " +event.offsetY);

    let target = raycaster.intersectObjects(items);
	if(event.type==="click"&&!target.length){//当很快地滑动时会造成target.length==0
		window.lastMouse.x = null;
		window.lastMouse.y = null;
	}
    if (target.length) {
      target[0].type = type;
      target[0].object.dispatchEvent(target[0],event);//改
    }

  };

  if (!wait) {
    (elem||document).addEventListener(type, listener, false);
  } else {
    (elem||document).addEventListener(type, debounce(listener, wait), false);
  }
  
  
}