import * as THREE from "../../libs/three.js/build/three.module.js";
import {LineDraw, MeshDraw} from "../utils/DrawUtil";
import math from "./math.js";






const verticalLine = new THREE.Line3()

//控制点和边的合集。具有可以拖拽修改的功能，拖拽时能防止线相交。
export class ctrlPolygon extends THREE.Object3D { 
    constructor (type, prop) {
        super()
        this.type = type
        
        this.maxMarkers = Number.MAX_SAFE_INTEGER;
       
         
        this.transformData(prop);
        for(let i in prop){
            this[i] = prop[i]
        }
        
        if(this.closed && this.dimension == '2d'){
            this.areaPlane = this.createAreaPlane(); 
            this.add(this.areaPlane)
        }
        
        //数据--刚开始一定是空的
        this.points = []; 
        //mesh 不一定有
        this.markers = []; 
		this.edges = [];
        
        this.center
        
        
        
        
    }
    
    initData(prop){
        //开始加数据  
        if(prop.points){ 
        
            for(const p of prop.points){
                const pos = new THREE.Vector3().copy(p) 
                this.addMarker({point:pos}); 
            }
         
            if(this.datasetId != void 0){//初始化位置
                if(this.dataset_points){
                    this.dataset_points = this.dataset_points.map(e=>{
                        return e && new THREE.Vector3().copy(e) 
                    })
                    this.transformByPointcloud() //根据dataset_points生成points  
                }  
            }else{
                if(prop.dataset_points && prop.dataset_points.some(e=>e != void 0)){
                    console.error('存在测量线的datasetId为空而dataset_points有值，请检查并删除:'+this.sid)//存在过的bug，原因未知，可能是后台处理dataset时替换的错误：http://192.168.0.21/index.php?m=bug&f=view&bugID=23601
                    console.log(this)
                }
            }
            
            
              
            
            this.getFacePlane()
            this.getPoint2dInfo(this.points)
            
            this.update(true)
            //this.dragChange(new THREE.Vector3().copy(prop.points[prop.points.length-1]), prop.points.length-1); 
            this.setSelected(false )
            this.addHoverEvent()
            
        }
    }
    
    
    
    addHoverEvent(){ //当非isNew时才添加事件
        this.markers.forEach(marker =>{
            
            let mouseover = (e) => { 
                this.setMarkerSelected(e.object, true, 'single');/* console.log('hover')  */
                viewer.dispatchEvent({
                    type : "CursorChange", action : "add",  name:"markerMove"
                }) 
            };
            let mouseleave = (e) => { 
                this.setMarkerSelected(e.object, false, 'single');/* console.log('hoveroff')  */
                viewer.dispatchEvent({
                    type : "CursorChange", action : "remove",  name:"markerMove"
                })
            }

            
            marker.addEventListener('mouseover', mouseover);
            marker.addEventListener('mouseleave', mouseleave);
        
        })
            
    }
    
    addMarker(o={}){
        var index = o.index == void 0 ? this.points.length : o.index  //要当第几个
        
        this.points = [...this.points.slice(0,index), o.point, ...this.points.slice(index,this.points.length)]
		//this.points.push(o.point);
         
        if(o.marker){
            this.add(o.marker)
            this.markers = [...this.markers.slice(0,index), o.marker, ...this.markers.slice(index,this.markers.length)]
            this.updateMarker(o.marker, o.point)
            o.marker.addEventListener('drag', this.dragMarker.bind(this));
            o.marker.addEventListener('drop', this.dropMarker.bind(this));
            
        } 
        
        if(o.edge){
            this.add(o.edge)
            this.edges = [...this.edges.slice(0,index), o.edge, ...this.edges.slice(index,this.edges.length)]
        } 
        
        
    }
    
    
    
    
    dragMarker(e){
        
        var I, atMap 
        
        if(e.drag.hoverViewport != e.drag.dragViewport)return 
        atMap = e.drag.dragViewport.name == 'mapViewport' 
        
        if(atMap && this.unableDragAtMap){
            viewer.dispatchEvent({
                type : "CursorChange", action : "add",  name:"polygon_AtWrongPlace"
            });
            e.drag.object = null //取消拖拽
            return
        }
        
        I = e.intersectPoint && (e.intersectPoint.orthoIntersect || e.intersectPoint.location)
        
        //记录数据集
        
        //在三维中脱离点云（在map中拉到周围都没有点云的地方）的顶点，无法拖拽怎么办
         
        if (I) { 
            atMap && (I.z = 0)
            let i = this.markers.indexOf(e.drag.object);
            if (i !== -1) { 
                this.dragChange(I, i, atMap) 
                
                if(this.points_datasets){
                    if(e.intersectPoint.pointcloud) this.points_datasets[i] = e.intersectPoint.pointcloud.dataset_id
                    else this.points_datasets[i] = null
                } 
            }
            
            
        }
        
        
        this.editStateChange(true)
        
    };
    
    
    
    
    
    
    dragChange(intersectPos, i, atMap){
        var len = this.markers.length
        var location = intersectPos.clone()

        if(this.faceDirection && this.maxMarkers == 2 && len == 2){//add 固定方向的点不直接拖拽
            var p1 = this.markers[0].position
            if(this.faceDirection == 'horizontal'){
                var projectPos = location.clone().setZ(p1.z)
            }else{
                var projectPos = p1.clone().setZ(location.z)
            }
            //var p2 = p1.clone().add(this.direction)
            //var projectPos = math.getFootPoint(location, p1, p2)
            
            
            LineDraw.updateLine(this.guideLine, [location, projectPos])
            location = projectPos
            this.guideLine.visible = true
        }else if( len > 1){ 
             
            var points = this.points.map(e=>e.clone())
            points[i].copy(location) //算normal需要提前确认point
            
            //若为定义了面朝向的矩形
            if(this.faceDirection == 'horizontal'){
                if(len == 2){
                    location.setZ(points[0].z) 
                }
                if(!this.facePlane){//一个点就能确定面
                    this.facePlane = new THREE.Plane().setFromNormalAndCoplanarPoint( new THREE.Vector3(0,0,1), this.points[0]  )
                }
            }else if(this.faceDirection == 'vertical'){//当有两个点时， 有两个方向的可能
                if(len == 2){
                    if(this.isRect){
                        let vec = points[0].clone().sub(location) 
                        if(Math.sqrt(vec.x*vec.x+vec.y*vec.y) > Math.abs(vec.z) ){//水平（高度差小于水平距离时）
                            location.setZ(points[0].z) 
                            //this.cannotConfirmNormal = false;//能确定面为水平方向
                        }else{//垂直 （当两点一样时也属于这种）
                            location.setX(points[0].x);
                            location.setY(points[0].y);
                            //this.cannotConfirmNormal = true; //不能确定面，因第三点可绕着纵轴线自由移动
                        }
                    }
                }else{ 
                    {//判断cannotConfirmNormal. 如果前几段都在竖直线上，就不能固定出面方向。
                        this.cannotConfirmNormal = true
                        let max = this.isRect ? 1 : len-2 
                        for(let i=0;i<max;i++){
                            let p1 = points[i].clone()
                            let p2 = points[i+1].clone()
                            let vec = p1.sub(p2);
                            if(vec.x != 0 || vec.y != 0){
                                this.cannotConfirmNormal = false
                                break;
                            } 
                        } 
                    }
                    
                    if(!this.facePlane || this.cannotConfirmNormal){//三个点且为水平方向时，计算面
                          
                        var points_ = points.map(e=>new THREE.Vector2(e.x,e.y))
                        var points2 = getDifferentPoint(points_, 2); 
                        if(points2){
                            let normal = math.getNormal2d({p1:points2[0], p2:points2[1]})  
                            normal = new THREE.Vector3(normal.x, normal.y, 0)
                            this.facePlane = new THREE.Plane().setFromNormalAndCoplanarPoint( normal, this.points[0]  )
                        } 
                    }
                }
            } 

            if(len > 2){//area
            
                if(!this.faceDirection){ 
                    if(len == 3 || this.isRect) this.cannotConfirmNormal = true //当第三个点固定后（有四个点时）才能固定面
                    if(!this.facePlane || this.cannotConfirmNormal){
                        var points3 = getDifferentPoint(points, 3);//只有找到三个不同的点算拥有面和area
                        if(points3){
                            this.facePlane = new THREE.Plane().setFromCoplanarPoints(...points3 )
                        }
                    }
                }
                
                if( this.facePlane && !this.cannotConfirmNormal  ){//之后加的点一定要在面上  
                    if(atMap){ 
                        //地图上用垂直线，得到和面的交点。
                        verticalLine.set(location.clone().setZ(100000), location.clone().setZ(-100000))//确保长度范围覆盖所有测量面 
                        location = this.facePlane.intersectLine(verticalLine, new THREE.Vector3() )
                        if(!location) return; 
                    }else{ 
                        location = this.facePlane.projectPoint(intersectPos, new THREE.Vector3() )
                    }
                }  
                
                
                points[i].copy(location)//再copy确认一次
                
                if(this.isRect){ //是矩形 （即使没有faceDirection也能执行）
                    //根据前两个点计算当前和下一个点
                    var p1 = points[(i-2+len)%len]
                    var p2 = points[(i-1+len)%len]
                    if(p1.equals(p2)){//意外情况：重复点两次 ( bug点，改了好多遍)
                        if(this.faceDirection == 'vertical'){
                            p2.add(new THREE.Vector3(0,0,0.0001))
                        }else{
                            p2.add(new THREE.Vector3(0,0.0001,0))
                        } 
                    } 
                    //p3 : location 
                    var foot = math.getFootPoint(location, p1, p2)//p2 修改p2到垂足的位置
                    var vec = foot.clone().sub(location)
                    var p4 = p1.clone().sub(vec) 
                     
                    
                    points[(i-1+len)%len].copy(foot) 
                    points[(i+1)%len].copy(p4) 
                    this.setPosition((i-1+len)%len, foot);//p2
                    this.setPosition((i+1)%len, p4);
                    
                }  
                
                /* let points2d;
                if(this.facePlane){
                    var originPoint0 = points[0].clone() 
                    var qua = math.getQuaBetween2Vector(this.facePlane.normal, new THREE.Vector3(0,0,1), new THREE.Vector3(0,0,1));
                    points2d = points.map(e=>e.clone().applyQuaternion(qua))  
                } */
                this.getPoint2dInfo(points)
                
                var isIntersectSelf = !this.isRect && len > 3 && this.intersectSelf(this.point2dInfo.points2d)//检测相交
                if(isIntersectSelf){
                    //not-allowed
                    viewer.dispatchEvent({
                        type : "CursorChange", action : "add",  name:"polygon_isIntersectSelf"
                    })
                    this.isIntersectSelf = true
                    return
                }else{
                    this.isIntersectSelf = false
                    viewer.dispatchEvent({
                        type : "CursorChange", action : "remove",  name:"polygon_isIntersectSelf"
                    })
                    /* this.facePlane && (this.point2dInfo = {
                        originPoint0 ,
                        points2d,
                        quaInverse : qua.clone().invert()
                    }) */
                }
                
                
                 
            }
            
            var showGuideLine = len>1 && (this.faceDirection || len > 3)
            if(showGuideLine && this.guideLine){
                LineDraw.updateLine(this.guideLine, [intersectPos, location])
                this.guideLine.visible = true
            } 
             
            //console.log(this.points.map(e=>e.toArray())) 

        } 
        if(this.retrictArea && !math.isPointInArea(this.retrictArea.points, location)){
            viewer.dispatchEvent({
                type : "CursorChange", action : "add",  name:"polygon_AtWrongPlace"
            })
            this.isAtWrongPlace = true
            return
        }else{
            viewer.dispatchEvent({
                type : "CursorChange", action : "remove",  name:"polygon_AtWrongPlace"
            })
            this.isAtWrongPlace = false
            this.setPosition(i, location); 
            this.update()
            
            this.dispatchEvent({type:'dragChange', index:i})
        }
        
        
    }
    
    dropMarker(e){
        if (this.isNew && e.pressDistance>Potree.config.clickMaxDragDis){//拖拽的话返回
            return continueDrag(e, this)   
        } 
        
        if(e.isTouch){
            this.dragMarker(e) //触屏时必须先更新下点
        }
        
        
        if (e.button != THREE.MOUSE.RIGHT && (//右键click的话继续执行，因为会停止
                this.isIntersectSelf && this.isNew //有线相交了
                || this.isAtWrongPlace && this.isNew
                || !e.isAtDomElement && this.isNew//如果是刚添加时在其他dom点击， 不要响应
                ||  e.hoverViewport != viewer.mainViewport && this.unableDragAtMap //垂直的测量线不允许在地图上放点
                || !getDifferentPoint(this.points, this.points.length) //不允许和之前的点相同 
            ) 
        ){
            return continueDrag(e, this)   
        } 
         
        
         
        let i = this.markers.indexOf(e.drag.object); 
        if (i !== -1) {
            this.dispatchEvent({
                'type': 'marker_dropped', 
                'index': i
            });
            if(this.markers.length>2 && this.facePlane)this.cannotConfirmNormal = false
            this.guideLine &&(this.guideLine.visible = false)
        }
        
       
        
        this.setMarkerSelected(e.drag.object, false, 'single') 
        
        this.editStateChange(false)
        
        
        
        
        e.drag.endDragFun && e.drag.endDragFun(e)//  addmarker
        if(this.changeCallBack)this.changeCallBack()
    };
    
    getFacePlane(){//最普通一种get方法，根据顶点。且假设所有点已经共面,且不重合
        if(this.points.length<3) return
        this.facePlane = new THREE.Plane().setFromCoplanarPoints(...this.points.slice(0,3) )
         
    }
    
    getPoint2dInfo(points){ //在更新areaplane之前必须更新过point2dInfo
        if(this.facePlane){ 
            var originPoint0 = points[0].clone() 
            var qua = math.getQuaBetween2Vector(this.facePlane.normal, new THREE.Vector3(0,0,1), new THREE.Vector3(0,0,1));
            let points2d = points.map(e=>e.clone().applyQuaternion(qua))  
        
            this.point2dInfo = {
                originPoint0 ,
                points2d,
                quaInverse : qua.clone().invert()
            } 
        }    
    }
    
    
    
    
    setPosition (index, position) {//拖拽后设置位置
		let point = this.points[index];
		point.copy(position);
        if(this.datasetId){
            this.dataset_points[index] = Potree.Utils.datasetPosTransform.toDataset({datasetId:this.datasetId, position:point.clone()})
        
        }
        let marker = this.markers[index];  
        this.updateMarker(marker, point)
 
	 
	} 
    
    updateMarker(marker, pos){
        marker.position.copy(pos);
        marker.update();
    }
    
    
    intersectSelf(points2d){//add
        var len =  points2d.length
        for(var i=0;i<len;i++){
            for(var j=i+2;j<len;j++){
                if(Math.abs(j-len-i)<2)continue;//不和邻边比
                
                var p1 =  points2d[i]
                var p2 =  points2d[i+1]
                var p3 =  points2d[j]
                var p4 =  points2d[(j+1)%len] 
                if(p1.equals(p2) || p3.equals(p4) || p1.equals(p3) || p2.equals(p3) || p1.equals(p4) || p2.equals(p4))continue 
             
                
                var line1 = [p1,p2]
                var line2 = [p3,p4]
                var intersect = math.isLineIntersect(line1, line2, false, 0.001)
                if(intersect){
                    return true
                    break
                } 
            }
        }
          
    }
	
    removeMarker (index) {
        
		this.points.splice(index, 1); 
       
		this.remove(this.markers[index]); 
        this.markers.splice(index, 1);   
 
		let edgeIndex = index//(index === 0) ? 0 : (index - 1);
		this.remove(this.edges[edgeIndex]);
		this.edges.splice(edgeIndex, 1);
  
        this.point2dInfo && this.point2dInfo.points2d.splice(index, 1); //add


		//this.update(); 
	} 
    
    createAreaPlane(mat){ 
        var geometry = new THREE.Geometry();
        var mesh = new THREE.Mesh(geometry, mat)
        
        return mesh
    }
    
    updateAreaPlane(){
        if(!this.point2dInfo)return
        this.areaPlane.geometry.dispose()
        if(this.points.length>2){
            this.areaPlane.geometry = MeshDraw.getShapeGeo(this.point2dInfo.points2d)
            var center = math.getCenterOfGravityPoint(this.point2dInfo.points2d) //重心 
                  
            var firstPos =  this.point2dInfo.points2d[0].clone()
            firstPos.z = 0                  //因为shape只读取了xy,所以位移下, 再算出最终位置，得到差距
            firstPos.applyQuaternion(this.point2dInfo.quaInverse)
            var vec = this.point2dInfo.originPoint0.clone().sub(firstPos)
            center = new THREE.Vector3(center.x, center.y, 0)
            center.applyQuaternion(this.point2dInfo.quaInverse)
            this.areaPlane.quaternion.copy(this.point2dInfo.quaInverse) 
            this.areaPlane.position.copy(vec)       
            center.add(vec)
            this.center = center 
        }else{
            this.areaPlane.geometry = new THREE.Geometry()
            
        } 
        
        
    }


    
    
    
     

    update(ifUpdateMarkers){
        if(this.points.length === 0){
			return;
		} 
        
        
        
        
        
        let lastIndex = this.points.length - 1;
            
       
        for (let index = 0; index <= lastIndex; index++) {
            
            let nextIndex = (index + 1 > lastIndex) ? 0 : index + 1;
            let previousIndex = (index === 0) ? lastIndex : index - 1;

            let point = this.points[index];
            let nextPoint = this.points[nextIndex];
            let previousPoint = this.points[previousIndex];

            if(ifUpdateMarkers){
                this.updateMarker(this.markers[index], point)
            }   

            { // edges
                let edge = this.edges[index]; 
                if(edge){
                    LineDraw.updateLine(edge, [point, nextPoint]) 
                    //edge.visible = index < lastIndex || this.isRect || (this.closed && !this.isNew);
                }
                
                
            }

            
             
        }
        
        if(this.areaPlane){
            this.updateAreaPlane() 
        }
        
             
        viewer.mapViewer.emit('content_changed')
        
    } 
    
    dispose(){//add 
        this.parent.remove(this)
        /* viewer.dispatchEvent({
            type : "CursorChange", action : "remove",  name:"polygon_isIntersectSelf"
        })
        viewer.dispatchEvent({
            type : "CursorChange", action : "remove",  name:"polygon_AtWrongPlace"
        }) */
    }
    
    
    reDraw(restMarkerCount=0){//重新开始画
        let pointCount = this.points.length - restMarkerCount // restMarkerCount为需要留下的marker数量
        while(pointCount > 0){
            this.removeMarker(--pointCount)
        }
        this.point2dInfo = null
        this.facePlane = null   
         
        
                    
    }
    
    
    setMarkerSelected(){}
    editStateChange(state){
        if(!state){
            viewer.dispatchEvent({
                type : "CursorChange", action : "remove",  name:"polygon_isIntersectSelf"
            })
            viewer.dispatchEvent({
                type : "CursorChange", action : "remove",  name:"polygon_AtWrongPlace"
            })
        }
    }
    
    transformData(){}
    setSelected(){}
}



function getDifferentPoint(points, count){//for facePlane
    var result = [];
    for(let i=0;i<points.length;i++){
        var p = points[i];
        if(result.find(e=>e.equals(p)))continue;
        else result.push(p)
        if(result.length == count)break
    }
    if(result.length == count)return result
}


 



function continueDrag(e, this_){
    setTimeout(()=>{//等 drag=null之后 //右键拖拽结束后需要重新得到drag
        if(this_.parent){//没被删的话
            viewer.inputHandler.startDragging(e.drag.object,
                {endDragFun: e.drag.endDragFun, notPressMouse:e.drag.notPressMouse, dragViewport:e.drag.dragViewport} 
            )
        } 
    },1)
}