/**
 * @author mschuetz / http://mschuetz.at
 *
 *
 */

import * as THREE from "../../libs/three.js/build/three.module.js";
import {KeyCodes} from "../KeyCodes.js";
import {Utils} from "../utils.js";
import {MOUSE} from "../defines.js"; 
import {EventDispatcher} from "../EventDispatcher.js";


export class InputHandler extends EventDispatcher {
	constructor (viewer,scene) {
		super();

		this.viewer = viewer; 
		this.renderer = viewer.renderer;
		this.domElement = this.renderer.domElement;
		this.enabled = true;
		
		this.scene = scene;
		this.interactiveScenes = [];
		this.interactiveObjects = new Set();
		this.inputListeners = [];
		this.blacklist = new Set();

		this.drag = null;
		this.mouse = new THREE.Vector2(0, 0);
        //add:
        this.pointer = new THREE.Vector2(0, 0); //交互点的屏幕坐标，有别于DOM坐标，在此存放NDC坐标。（NDC，三维常用坐标系，二维坐标，整个屏幕映射范围（-1,1），屏幕中心为原点，+Y朝上，+X朝右）
		this.mouseDownMouse = new THREE.Vector2(0, 0);
        
        this.selection = [];

		this.hoveredElements = [];
		this.pressedKeys = {};
        
		this.wheelDelta = 0;

		this.speed = 1;

		this.logMessages = false;

		if (this.domElement.tabIndex === -1) {
			this.domElement.tabIndex = 2222;
		}
        
        
     


        
        
        
        
		this.domElement.addEventListener('contextmenu', (event) => { event.preventDefault(); }, false);
		this.domElement.addEventListener('click', this.onMouseClick.bind(this), false);
		this.domElement.addEventListener('mousedown', this.onMouseDown.bind(this), false);
		window.addEventListener('mouseup', this.onMouseUp.bind(this), false);
		this.domElement.addEventListener('mousemove', this.onMouseMove.bind(this), false);
        //add
       /*  this.domElement.addEventListener("pointerout", this.onMouseUp.bind(this)),
        this.domElement.addEventListener("pointercancel", this.onMouseUp.bind(this)),
        
         */
        
		this.domElement.addEventListener('mousewheel', this.onMouseWheel.bind(this), false);
		this.domElement.addEventListener('DOMMouseScroll', this.onMouseWheel.bind(this), false); // Firefox
        
		this.domElement.addEventListener('dblclick', this.onDoubleClick.bind(this)); 
		
        this.domElement.addEventListener('keydown', this.onKeyDown.bind(this));
		this.domElement.addEventListener('keyup', this.onKeyUp.bind(this));
		this.domElement.addEventListener('touchstart', this.onTouchStart.bind(this));
		this.domElement.addEventListener('touchend', this.onTouchEnd.bind(this));
		this.domElement.addEventListener('touchmove', this.onTouchMove.bind(this));
	}

	/* addInputListener (listener) {
		this.inputListeners.push(listener);
	}

	removeInputListener (listener) {
		this.inputListeners = this.inputListeners.filter(e => e !== listener);
	}

	getSortedListeners(){
		return this.inputListeners.sort( (a, b) => {
			let ia = (a.importance !== undefined) ? a.importance : 0;
			let ib = (b.importance !== undefined) ? b.importance : 0;

			return ib - ia;
		});
	} */

	onTouchStart (e) {
		if (this.logMessages) console.log(this.constructor.name + ': onTouchStart');

		e.preventDefault();





		if (e.touches.length === 1) {
			let rect = this.domElement.getBoundingClientRect();
			let x = e.touches[0].pageX - rect.left;
			let y = e.touches[0].pageY - rect.top;
			this.mouse.set(x, y);

			this.startDragging(null);
		}

		
		/* for (let inputListener of this.getSortedListeners()) {
			inputListener */this.viewer.dispatchEvent({
				type: /* "global_"+ */e.type, // global_ 是否加上
				touches: e.touches,
				changedTouches: e.changedTouches
			});
		//}
        
        //add
        this.mouseDownMouse = this.mouse.clone()
	}

	onTouchEnd (e) {
		if (this.logMessages) console.log(this.constructor.name + ': onTouchEnd');

		e.preventDefault();

		/* for (let inputListener of this.getSortedListeners()) {
			inputListener. */this.viewer.dispatchEvent({
				type: 'global_drop',
				drag: this.drag,
				viewer: this.viewer
			});
		//}

		this.drag = null;

		/* for (let inputListener of this.getSortedListeners()) {
			inputListener */this.viewer.dispatchEvent({
				type: 'global_' + e.type,
				touches: e.touches,
				changedTouches: e.changedTouches
			});
		//}
	}

	onTouchMove (e) {
		if (this.logMessages) console.log(this.constructor.name + ': onTouchMove');

		e.preventDefault();

		if (e.touches.length === 1) {
			let rect = this.domElement.getBoundingClientRect();
			let x = e.touches[0].pageX - rect.left;
			let y = e.touches[0].pageY - rect.top;
			this.mouse.set(x, y);

			if (this.drag) {
				this.drag.mouse = 1; //why??非左键也非右键的意思？

				this.drag.mouseDelta.x = x - this.drag.end.x;
				this.drag.mouseDelta.y = y - this.drag.end.y;

				this.drag.end.set(x, y);

				if (this.logMessages) console.log(this.constructor.name + ': drag: ');
				/* for (let inputListener of this.getSortedListeners()) {
					inputListener */this.viewer.dispatchEvent({
						type: 'global_drag',
						drag: this.drag,
						viewer: this.viewer
					});
				//}
			}
		}

		/* for (let inputListener of this.getSortedListeners()) {
			inputListener. */this.viewer.dispatchEvent({
				type: e.type,
				touches: e.touches,
				changedTouches: e.changedTouches
			});
		//}

		// DEBUG CODE
		// let debugTouches = [...e.touches, {
		//	pageX: this.domElement.clientWidth / 2,
		//	pageY: this.domElement.clientHeight / 2}];
		// for(let inputListener of this.getSortedListeners()){
		//	inputListener.dispatchEvent({
		//		type: e.type,
		//		touches: debugTouches,
		//		changedTouches: e.changedTouches
		//	});
		// }
	}

	onKeyDown (e) {
		if (this.logMessages) console.log(this.constructor.name + ': onKeyDown');

		// DELETE
		if (e.keyCode === KeyCodes.DELETE && this.selection.length > 0) {
			this.dispatchEvent({
				type: 'delete',
				selection: this.selection
			});

			this.deselectAll();
		}

		this.dispatchEvent({
			type: 'keydown',
			keyCode: e.keyCode,
			event: e                                            
		});

		// for(let l of this.getSortedListeners()){
		//	l.dispatchEvent({
		//		type: "keydown",
		//		keyCode: e.keyCode,
		//		event: e
		//	});
		// }

		this.pressedKeys[e.keyCode] = true;

		// e.preventDefault();
	}

	onKeyUp (e) {
		if (this.logMessages) console.log(this.constructor.name + ': onKeyUp');

		delete this.pressedKeys[e.keyCode];

		e.preventDefault();
	}

	onDoubleClick (e) {
		if (this.logMessages) console.log(this.constructor.name + ': onDoubleClick');

		let consumed = false;
		for (let hovered of this.hoveredElements) {
			if (hovered._listeners && hovered._listeners['dblclick']) {
				hovered.object.dispatchEvent({
					type: 'dblclick',
					mouse: this.mouse,
					object: hovered.object
				});
				consumed = true;
				break;
			}
		}

		if (!consumed) {
			/* for (let inputListener of this.getSortedListeners()) {
				inputListener. */this.viewer.dispatchEvent({
					type: 'global_dblclick',
					mouse: this.mouse,
					object: null
				});
			//}
		}

		e.preventDefault();
	}

	onMouseClick (e) {
		if (this.logMessages) console.log(this.constructor.name + ': onMouseClick');

		e.preventDefault();
	}

	onMouseDown (e) {
         
		if (this.logMessages) console.log(this.constructor.name + ': onMouseDown');
        
        //重新获取一下pointer, 因点击了浏览器的按钮展开列表时 move回来不会触发onmousemove，所以pointer是旧的
        var  {  camera, viewport  } = this.getPointerInViewport(e.clientX, e.clientY ) 
		this.hoverViewport = viewport
        if(!viewport)return 
    
		e.preventDefault(); 
        
        //this.onMouseMove(e)//add 重新获取一下mouse， 因在此前canvas可能失去侦听(不记得是什么了。如果一定要的话再写个加侦听的函数，但是直接调用mousemove的话会发送drag，导致magnifier停止渲染)
        
		let consumed = false;
		let consume = () => { return consumed = true; };
		if (this.hoveredElements.length === 0) {
			/* for (let inputListener of this.getSortedListeners()) {
				inputListener */this.viewer.dispatchEvent({
					type: 'global_mousedown',
					viewer: this.viewer,
					mouse: this.mouse
				});
			//}
		}else{
			for(let hovered of this.hoveredElements){
				let object = hovered.object;
				object.dispatchEvent({
					type: 'mousedown',
					viewer: this.viewer,
					consume: consume
				});

				if(consumed){
					break;
				}
			}
		}


        
        

		if (!this.drag) {
			let target = e.button == THREE.MOUSE.LEFT && this.hoveredElements.find(el => (//只有左键能拖拽
					el.object._listeners &&
					el.object._listeners['drag'] &&
					el.object._listeners['drag'].length > 0));

			if (target) {
				this.startDragging(target.object, {location: target.point});
			} else {
				this.startDragging(null);
			}
		}
        
         
        //add
        this.drag.pointerDragStart = this.pointer.clone()
        this.drag.intersectStart = this.intersectPoint;
        this.mouseDownMouse = this.mouse.clone()
        this.dragViewport = this.hoverViewport;
		 
	}

	onMouseUp (e) {
        if(!this.drag){// 在canvas外mousedown
            return 
        }
		if (this.logMessages) console.log(this.constructor.name + ': onMouseUp');

		e.preventDefault();
        
        let pressDistance = this.mouseDownMouse.distanceTo(this.mouse);
		let noMovement = this.drag.pointerDelta.length() == 0//this.getNormalizedDrag().length() === 0;
        
		let consumed = false;
		let consume = () => { return consumed = true; };
		//if (this.hoveredElements.length === 0) {
			/* for (let inputListener of this.getSortedListeners()) {
				inputListener */this.viewer.dispatchEvent({
					type: 'global_mouseup',
					viewer: this.viewer,
					mouse: this.mouse,
					consume: consume,
                    drag :this.drag,
                    pressDistance 
				});

				/* if(consumed){//??
					break;
				} */
			//}
		//}
        if (this.hoveredElements.length > 0) {        
			let hovered = this.hoveredElements
				.map(e => e.object)
				.find(e => (e._listeners && e._listeners['mouseup']));
			if(hovered){
				hovered.dispatchEvent({
					type: 'mouseup',
					viewer: this.viewer,
					consume: consume
				});
			} 
        }
        
        
        
		if (this.drag) { 
            //拖拽结束
			if (this.drag.object/*  && e.button == THREE.MOUSE.LEFT */) {//add LEFT
				if (this.logMessages) console.log(`${this.constructor.name}: drop ${this.drag.object.name}`);
				this.drag.object.dispatchEvent({
					type: 'drop',
					drag: this.drag, 
					viewer: this.viewer,
                    pressDistance,
                    button : e.button,//add 放开的鼠标按键
                    isAtDomElement: e.target == this.domElement,
                    viewport:this.dragViewport 
                    
				});
			} else {
				/* for (let inputListener of this.getSortedListeners()) {
					inputListener. */this.viewer.dispatchEvent({
						type: 'global_drop',
						drag: this.drag,
						viewer: this.viewer,
                        pressDistance,
                        isAtDomElement: e.target == this.domElement,
                        button: e.button //add
					});
				//}
                
                
                // check for a click 
                if(pressDistance < Potree.config.clickMaxDragDis){
                    if(this.hoveredElements && this.hoveredElements[0]){
                        if (this.logMessages) console.log(`${this.constructor.name}: click ${clicked.name}`);
                        this.hoveredElements[0].object.dispatchEvent({
                            type: 'click',
                            viewer: this.viewer,
                            consume: consume,
                            viewport: this.hoverViewport,
                            isAtDomElement: e.target == this.domElement,
                            button: e.button //add
                        });
                    }else{
                        /* for (let inputListener of this.getSortedListeners()) {
                            inputListener. */this.viewer.dispatchEvent({
                                type: 'global_click',
                                drag: this.drag,
                                viewer: this.viewer,
                                pressDistance,
                                viewport: this.hoverViewport,
                                isAtDomElement: e.target == this.domElement,
                                button: e.button //add
                            });
                        //}
                    }
                     
                }
                
			}

			
            
			/* let clicked = this.hoveredElements.map(h => h.object).find(v => v === this.drag.object) !== undefined;
			if(clicked){
				if (this.logMessages) console.log(`${this.constructor.name}: click ${this.drag.object.name}`);
				this.drag.object.dispatchEvent({
					type: 'click',
					viewer: this.viewer,
					consume: consume,
				});
			} */
            this.drag = null;
            
		}

        this.dragViewport = null

		if(!consumed && !this.fixSelection){
			if (e.button === THREE.MOUSE.LEFT) {
				if (noMovement) {
					let selectable = this.hoveredElements
						.find(el => el.object._listeners && el.object._listeners['select']);

					if (selectable) {
						selectable = selectable.object;

						if (this.isSelected(selectable)) {
							this.selection
								.filter(e => e !== selectable)
								.forEach(e => this.toggleSelection(e));
						} else {
							this.deselectAll();
							this.toggleSelection(selectable);
						}
					} else {
						this.deselectAll();
					}
				}
			} else if ((e.button === THREE.MOUSE.RIGHT) && noMovement) {
				this.deselectAll();
			}
		}
	}



    getPointerInViewport(clientX, clientY, viewForceAt ){
        let rect = this.domElement.getBoundingClientRect();
        let x = clientX - rect.left;
        let y = clientY - rect.top;
        let camera 
        let viewport 
        
        //if(this.viewer.viewports || viewForceAt){
            var getDimension = (view)=>{
                var left = Math.floor(this.domElement.clientWidth * view.left)
                 , bottom = this.domElement.clientHeight * view.bottom
                 , width = Math.floor(this.domElement.clientWidth * view.width)
                 , height = this.domElement.clientHeight * view.height
                 ,   top = Math.floor(this.domElement.clientHeight - bottom - height) 
                return {left, bottom, width, height, top}
            }
            var getView = (view, left, bottom, width, height, top)=>{
                this.mouse.set(x-left, y - top )
                Utils.convertScreenPositionToNDC(this.pointer, this.mouse, width, height);
                camera = view.camera;
                viewport = view 
            }
            
            if(viewForceAt){
                let {left, bottom, width, height, top} = getDimension(viewForceAt)
                getView(viewForceAt, left, bottom, width, height, top)
                
                
            }else{
                var length = this.viewer.viewports.length;
                //var getif = false
                for(var i=0;i<length;i++){
                    var view = this.viewer.viewports[i];
                    if(!view.active)continue
                    var {left, bottom, width, height, top} = getDimension(view)
                    
                     
                    if(x >= left && x <= left + width &&  y >= top && y <= top + height){ 
                        getView(view, left, bottom, width, height, top)   
                        
                        //getif = true 
                        break;
                    } 
                    
                }
                  
                
            } 
        /*} else{
            camera = this.viewer.scene.getActiveCamera()
            this.mouse.set(x , y )
            Utils.convertScreenPositionToNDC(this.pointer, this.mouse, this.domElement.clientWidth, this.domElement.clientHeight);
        }  */
        return { 
            camera, viewport 
        }
    }


    


	onMouseMove (e) {
          
        var  {  camera, viewport  } = this.getPointerInViewport(e.clientX, e.clientY,  this.dragViewport) 
		this.hoverViewport = viewport
        if(!viewport)return//刚变化viewport时会找不到
        
        
		let hoveredElements = this.getHoveredElements(); 
		if(hoveredElements.length > 0){
			let names = hoveredElements.map(h => h.object.name).join(", ");
			if (this.logMessages) console.log(`${this.constructor.name}: onMouseMove; hovered: '${names}'`);
		}
 
        //add
        let intersectPoint = viewport.noPointcloud? null : Utils.getMousePointCloudIntersection(
            viewport,
            this.mouse,
            this.pointer, 
            camera, 
            this.viewer, 
            this.viewer.scene.pointclouds,
            {pickClipped: true});
            
          
        if(viewport.camera.type == 'OrthographicCamera'/*  == 'mapViewport' */){ 
            let pos3d = new THREE.Vector3(this.pointer.x,this.pointer.y,-1).unproject(viewport.camera); //z:-1朝外   
            pos3d.setZ(viewer.bound.boundingBox.min.z + 0.2) //大概放地面上
            if(!intersectPoint){
                intersectPoint = {}
            }   
            intersectPoint.orthoIntersect = pos3d.clone()
               
        }    
        if(e.onlyGetIntersect){
            return intersectPoint
        }
        e.preventDefault();
        
 
		if (this.drag) {//有拖拽（不一定拖拽了物体, 也不一定按下了鼠标）
			this.drag.mouse = e.buttons; 
            this.drag.hoverViewport = this.hoverViewport
			/* this.drag.mouseDelta.x = this.mouse.x - this.drag.end.x;
			this.drag.mouseDelta.y = this.mouse.y - this.drag.end.y; */
            this.drag.pointerDelta.set(this.pointer.x - this.drag.end.x, this.pointer.y - this.drag.end.y  )
			this.drag.end.set(this.pointer.x, this.pointer.y);
            
            
			if (this.drag.object && (e.buttons == MOUSE.NONE || !this.drag.notPressMouse )){//add notPressMouse 如果标记是不需要按鼠标的拖拽，则一旦按下鼠标，就暂停拖拽物体（改为拖拽场景）：（如添加测量时突然拖拽画面）
				if (this.logMessages) console.log(this.constructor.name + ': drag: ' + this.drag.object.name);
				this.drag.object.dispatchEvent({
					type: 'drag',
					drag: this.drag,
					viewer: this.viewer,
                    intersectPoint
				});
			} else {
                
                //add:
                this.drag.pointer = this.pointer.clone();
                
				if (this.logMessages) console.log(this.constructor.name + ': drag: ');

				let dragConsumed = false; 
				/* for (let inputListener of this.getSortedListeners()) {
					inputListener. */this.viewer.dispatchEvent({
						type: 'global_drag',
						drag: this.drag,
						viewer: this.viewer,
                        intersectPoint,
						consume: () => {dragConsumed = true;}
					});

					/* if(dragConsumed){
						break;
					} */
				//}
			}
		}else{
			let curr = hoveredElements.map(a => a.object).find(a => true);
			let prev = this.hoveredElements.map(a => a.object).find(a => true);

			if(curr !== prev){
				if(curr){
					if (this.logMessages) console.log(`${this.constructor.name}: mouseover: ${curr.name}`);
					curr.dispatchEvent({
						type: 'mouseover',
						object: curr,
					});
				}
				if(prev){
					if (this.logMessages) console.log(`${this.constructor.name}: mouseleave: ${prev.name}`);
					prev.dispatchEvent({
						type: 'mouseleave',
						object: prev,
					});
				}
			}

			if(hoveredElements.length > 0){
				let object = hoveredElements
					.map(e => e.object)
					.find(e => (e._listeners && e._listeners['mousemove']));
				
				if(object){
					object.dispatchEvent({
						type: 'mousemove',
						object: object
					});
				}
			}

            //仅在鼠标不按下时更新：
            {
                let handleState = viewer.modules.Alignment.handleState
                if(viewport.alignment && handleState && viewport.alignment[handleState]){
                    if(handleState == 'translate'){
                        if( intersectPoint && intersectPoint.location ){ 
                            viewer.dispatchEvent({
                                type : "CursorChange", action : "add",  name:"movePointcloud"
                            })
                        }else{
                            viewer.dispatchEvent({
                                type : "CursorChange", action : "remove",  name:"movePointcloud"
                            })
                        }
                    }else if(handleState == 'rotate'){ 
                        if( intersectPoint && intersectPoint.location ){ 
                            viewer.dispatchEvent({
                                type : "CursorChange", action : "add",  name:"rotatePointcloud"
                            })
                        }else{
                            viewer.dispatchEvent({
                                type : "CursorChange", action : "remove",  name:"rotatePointcloud"
                            })
                        }
                    }  
            }
            }
            

                
            
            
		}
        
         
        
		if (intersectPoint) { 
            
            
            if(viewer.showCoordType){ //显示坐标位置时
                let pos = intersectPoint.point.position.toArray()
                if(viewer.showCoordType == "local"){
                     
                }else if(viewer.showCoordType == "lonlat"){
                    pos = viewer.transform.lonlatToLocal.inverse(pos)
                }else{
                    pos = viewer.transform.lonlatToLocal.inverse(pos)
                    pos = viewer.transform.lonlatTo4550.forward(pos)
                    
                }
                 
                viewer.dispatchEvent({
                    type : "coordinateChange", pos
                })
            }  
        }
        
        
        this.intersectPoint = intersectPoint 
        
        
        intersectPoint && (this.hoverViewport.lastIntersect = intersectPoint)
        
        /* for (let inputListener of this.getSortedListeners()) {
            inputListener. */this.viewer.dispatchEvent({
                type: 'global_mousemove',
                intersectPoint,
                hoverViewport:this.hoverViewport,
                buttons: e.buttons,
                drag:this.drag,
            });
        //}
		

		this.hoveredElements = hoveredElements;
	}
	
	onMouseWheel(e){
		if(!this.enabled) return;

		if(this.logMessages) console.log(this.constructor.name + ": onMouseWheel");
		
		e.preventDefault();

		let delta = 0;
		if (e.wheelDelta !== undefined) { // WebKit / Opera / Explorer 9
			delta = e.wheelDelta;
		} else if (e.detail !== undefined) { // Firefox
			delta = -e.detail;
		}

		let ndelta = Math.sign(delta);

		// this.wheelDelta += Math.sign(delta);

		if (this.hoveredElement) {
			this.hoveredElement.object.dispatchEvent({
				type: 'mousewheel',
				delta: ndelta,
				object: this.hoveredElement.object
			});
		} else {
			/* for (let inputListener of this.getSortedListeners()) {
				inputListener. */this.viewer.dispatchEvent({
					type: 'global_mousewheel',
					delta: ndelta,
					object: null,
                    hoverViewport: this.hoverViewport
                    
				});
			//}
		}
	}

	startDragging (object, args = null) {

		let name = object ? object.name : "no name";
		if (this.logMessages) console.log(`${this.constructor.name}: startDragging: '${name}'`);

		this.drag = {
			start: this.pointer.clone(),
			end: this.pointer.clone(),
			pointerDelta: new THREE.Vector2(0, 0), 
			object: object, 
            dragViewport :  this.hoverViewport, //开始之后就不会变了
            hoverViewport: this.hoverViewport   //会变化
		};
        
        
        this.viewer.dispatchEvent({
            type: "startDragging",
            drag: this.drag,
            hoverViewport: this.hoverViewport
        })
        /* console.log('startDragging')
        console.log(this.drag.end) */



		if (args) {
			for (let key of Object.keys(args)) {
				this.drag[key] = args[key];
			}
		}
	}

	/* getMousePointCloudIntersection (mouse) {
		return Utils.getMousePointCloudIntersection(
			this.mouse, 
			this.scene.getActiveCamera(), 
			this.viewer, 
			this.scene.pointclouds);
	} */

	toggleSelection (object) {
		let oldSelection = this.selection;

		let index = this.selection.indexOf(object);

		if (index === -1) {
			this.selection.push(object);
			object.dispatchEvent({
				type: 'select'
			});
		} else {
			this.selection.splice(index, 1);
			object.dispatchEvent({
				type: 'deselect'
			});
		}

		this.dispatchEvent({
			type: 'selection_changed',
			oldSelection: oldSelection,
			selection: this.selection
		});
	}

	deselect(object){

		let oldSelection = this.selection;

		let index = this.selection.indexOf(object);

		if(index >= 0){
			this.selection.splice(index, 1);
			object.dispatchEvent({
				type: 'deselect'
			});

			this.dispatchEvent({
				type: 'selection_changed',
				oldSelection: oldSelection,
				selection: this.selection
			});
		}
	}

	deselectAll () {
		for (let object of this.selection) {
			object.dispatchEvent({
				type: 'deselect'
			});
		}

		let oldSelection = this.selection;

		if (this.selection.length > 0) {
			this.selection = [];
			this.dispatchEvent({
				type: 'selection_changed',
				oldSelection: oldSelection,
				selection: this.selection
			});
		}
	}

	isSelected (object) {
		let index = this.selection.indexOf(object);

		return index !== -1;
	}

	registerInteractiveObject(object){
		this.interactiveObjects.add(object);
	}

	removeInteractiveObject(object){
		this.interactiveObjects.delete(object);
	}

	registerInteractiveScene (scene) {
		let index = this.interactiveScenes.indexOf(scene);
		if (index === -1) {
			this.interactiveScenes.push(scene);
		}
	}

	unregisterInteractiveScene (scene) {
		let index = this.interactiveScenes.indexOf(scene);
		if (index > -1) {
			this.interactiveScenes.splice(index, 1);
		}
	}

	getHoveredElement () {
		let hoveredElements = this.getHoveredElements();
		if (hoveredElements.length > 0) {
			return hoveredElements[0];
		} else {
			return null;
		}
	}

	getHoveredElements () {
		let scenes = this.hoverViewport.interactiveScenes || this.interactiveScenes.concat(this.scene);

		let interactableListeners = ['mouseup', 'mousemove', 'mouseover', 'mouseleave', 'drag', 'drop', 'click', 'select', 'deselect'];
		let interactables = [];
		for (let scene of scenes) {
			scene.traverseVisible(node => {//检测加了侦听的object
				if (node._listeners && node.visible && !this.blacklist.has(node)) {
					let hasInteractableListener = interactableListeners.filter((e) => {
						return node._listeners[e] !== undefined;
					}).length > 0;

					if (hasInteractableListener) {
						interactables.push(node);
					}
				}
			});
		}
		
		let camera = this.hoverViewport.camera
        let ray = Utils.mouseToRay(this.pointer, camera  );
		
		let raycaster = new THREE.Raycaster();
		raycaster.ray.set(ray.origin, ray.direction);  
        raycaster.camera = camera //add
        
      
        
        
		raycaster.params.Line.threshold = 0.2;
        //raycaster.layers.enableAll()//add
        viewer.setCameraLayers(raycaster,   //设置能识别到的layers（如空间模型里只有mapViewer能识别到marker）
            ['sceneObjects','mapObjects','measure','marker','transformationTool'],
            this.hoverViewport && this.hoverViewport.extraEnableLayers
        )
        
        
        viewer.emit('raycaster', {viewport: this.hoverViewport})//add
		let intersections = raycaster.intersectObjects(interactables.filter(o => o.visible), true); //原本是false 检测不到children
         
        intersections = intersections.map(e=>{//add 转化为interactables
            var object = e.object; 
            do{ 
               if(interactables.includes(object)) {
                   e.oriObject = e.object;
                   e.object = object; 
                   break
               } 
               object = object.parent
            }while(object)
       
            return e
        })
        
        //add for测量线，在检测到sphere时优先选中sphere而非线
        intersections = intersections.sort(function(a,b){return b.object.renderOrder-a.object.renderOrder}) // 降序
 

		return intersections;
	}

	/* setScene (scene) {
		this.deselectAll();

		this.scene = scene;
	} */

	update (delta) {

	}

	/*getNormalizedDrag () {
		if (!this.drag) {
			return new THREE.Vector2(0, 0);
		}

		let diff = new THREE.Vector2().subVectors(this.drag.end, this.drag.start);

		diff.x = diff.x / this.domElement.clientWidth;
		diff.y = diff.y / this.domElement.clientHeight;

		return diff;
	}

	getNormalizedLastDrag () {
		if (!this.drag) {
			return new THREE.Vector2(0, 0);
		}

		let mouseDelta = this.drag.mouseDelta.clone();

		mouseDelta.x = mouseDelta.x / this.domElement.clientWidth;
		mouseDelta.y = mouseDelta.y / this.domElement.clientHeight;

		return mouseDelta;
	} */
    
    getMouseDirection() {//add 
		let camera = this.hoverViewport.camera
        var t = new THREE.Vector3(this.pointer.x, this.pointer.y, -1).unproject(camera),
            i = new THREE.Vector3(this.pointer.x, this.pointer.y, 1).unproject(camera);
            
        return {origin: t, direction:i.clone().sub(t).normalize() }    
         
    }
    
    
}