import * as THREE from "../../../libs/three.js/build/three.module.js";
import DepthBasicMaterial from "../materials/DepthBasicMaterial.js";
import math from "../utils/math.js";

const geo = new THREE.PlaneBufferGeometry(1,1)
export default class Sprite extends THREE.Mesh{
    
    constructor(options={}){  
        super(geo, options.mat || new DepthBasicMaterial(options))/* ({map:options.map, useDepth:options.useDepth})) */
         
        this.root = options.root || this;
        this.renderOrder = options.renderOrder != void 0 ? options.renderOrder : 4;
        this.pickOrder = options.pickOrder || 0
        this.sizeInfo = options.sizeInfo
        this.dontFixOrient = options.dontFixOrient
        this.options = options 
        this.position.y = options.disToLine || 0 //离线距离
        
         
        this.matrixAutoUpdate = false;
        this.matrixMap = new Map() 
        
        if(this.root != this){
            this.matrixMapRoot = new Map() 
            this.root.matrixAutoUpdate = false;
        }
        
        
        this.visiMap = new Map()
        this.name = options.name || 'sprite'
        this.useViewport = null
        this.viewports = options.viewports//指定更新的viewports
        this.visible_ = true
        
        
        let clear = (e)=>{
            this.matrixMap.clear()//清空后在所有viewport上都必须更新才能渲染    //this.needsUpdate = true
        }
        viewer.mapViewer && viewer.mapViewer.addEventListener("camera_changed",  clear) 
        viewer.addEventListener("camera_changed",  clear) 
        /* if(viewer.viewports.length == 1){//直接更新。如果有多个不在这更新，在"render.begin"
            this.update(e)
        } */
         
        
        let applyMatrix = (e)=>{
            this.applyMatrix(e)
        }
        viewer.addEventListener("raycaster", applyMatrix)        //before render
        viewer.addEventListener("render.begin", applyMatrix) //before render   
        viewer.addEventListener("render.begin2", applyMatrix)  
        viewer.addEventListener("cameraSetLayers", applyMatrix) 
            
            
        this.addEventListener('dispose', ()=>{
            viewer.mapViewer && viewer.mapViewer.removeEventListener("camera_changed",  clear) 
            viewer.removeEventListener("camera_changed",  clear) 
            viewer.removeEventListener("raycaster", applyMatrix)        //before render
            viewer.removeEventListener("render.begin", applyMatrix)
            viewer.removeEventListener("render.begin2", applyMatrix)
            
        })
         
    }
    
    set visible(v){
        let oldV = this.visible_
        this.visible_ = v  
        if(v && !oldV){ 
            this.matrixMap && this.matrixMap.clear() //this.update() //update内有unableCompute会无限回调
        }
    }
    get visible(){
        return this.visible_ 
    }
    
     
    realVisible(viewport, interactables/* , raycaster */){
        if(interactables){
            if(!interactables.some((object)=>{//interactables中是否能找到this
                let finded
                object.traverse((object)=>{
                    if(object == this){
                        finded = true
                        return {stopContinue:true}
                    }
                })
                return finded
            }))return
        }
        
        /* if(interactables && viewport.name == 'mapViewport'){
            console.log(this)
        } */
        if(!(/* raycaster ||  */viewport.camera).layers.test(this.layers)){//如地图上一般不可见测量线
            return false
        }
        
        if(!this.visible && this.unvisibleReasons && this.unvisibleReasons.some(e=>e.reason != 'unableCompute')){
            return false
        }
        let v = true 
        let parent = this.parent 
        let lastParent = this
        while(parent){
            if(parent.visible === false){
                v = false
                break;  
            }
            lastParent = parent
            parent = parent.parent
        }
         
        if(v && !(lastParent instanceof THREE.Scene)){//已被删除
            v = false
        }            
         
        /* if(!this.latestRealVisi && v){//变为可见后先update 
            this.latestRealVisi = true
            setTimeout(()=>{
                this.update()
            },1)//延迟 防止无限调用
            return false
        }
        
        this.latestRealVisi = v */
        return v;
    }
    
    waitUpdate(){
        this.matrixMap.clear()//清空后在所有viewport上都必须更新才能渲染 
        //viewer.dispatchEvent('content_changed')
    }
    
    
    
    
    update(e={}){ 
        if(!e.viewport){
            let viewports = this.viewports || viewer.viewports
            if(!viewports)return 
            viewports.forEach(view=>{
                this.update({viewport:view}) 
            })
            return;
        }
        if(!this.root || ! this.realVisible(e.viewport, e.interactables) /* this.visible */ )return
        if(this.viewports && !this.viewports.includes(e.viewport) )return
        if(e.viewport.name == 'magnifier')return
        
        let camera = e.viewport.camera
        //rotation
        
        if(!this.dontFixOrient){        //orthoCamera一般要加dontFixOrient  
            let orient2dAngle    
    
            if(this.root.lineDir){   
                this.root.updateMatrix();//先更新，getWorldPosition才能得到正确的 
                this.root.updateMatrixWorld(true)
                let center = this.root.getWorldPosition(new THREE.Vector3())
                //由于两个端点容易在屏幕外，所以使用center和center加dir
                let setVisi = (state)=>{
                    this.visiMap.set(e.viewport, state)
                    Potree.Utils.updateVisible(this, 'unableCompute', !!state)
                }
                
                
                let r1 = Potree.Utils.getPos2d(center,   e.viewport,  viewer.renderArea, viewer.renderer); 
                if(!r1.trueSide)return  setVisi(false);// 但这句会使realVisible为false从而无法更新//console.error('!r1.trueSide') //中心点如果在背面直接不渲染了
                    
                let r2, point2
                
                let p2State = '', len=1,  p2StateHistory = []
                while(p2State != 'got' && p2StateHistory.length<10){ 
                    point2 = center.clone().add(this.root.lineDir.clone().multiplyScalar(len));
                     
                    r2 = Potree.Utils.getPos2d(point2, e.viewport , viewer.renderArea, viewer.renderer  );  
                    if(!r2.trueSide){ //很少遇到点2在背面的
                        if(!p2StateHistory.includes('tooLong-reverse')){
                            p2State = 'tooLong-reverse'  //先尝试反向
                            len = -len
                        }else{
                            p2State = 'tooLong'
                            len = len / 2
                        }
                    }else{
                        let dis = r2.pos.distanceTo(r1.pos)
                        if(math.closeTo(dis,0)){
                            //console.log('dis == 0') 
                            setVisi(false)
                            return
                            break
                        } 
                        if(dis<10 && !p2StateHistory.includes('tooLong')){//和r1的屏幕距离太近，要加长,否则精度过低
                            p2State = 'tooShort'
                            len = 100/dis * len  
                        }else{ 
                            p2State = 'got'; break;
                        }
                    } 
                    p2StateHistory.push(p2State) 
                }
                //console.log(p2StateHistory,len)
                
                if(!r2.trueSide){
                    return  setVisi(false)//, console.log('  !r2.trueSide', )
                }
                 
                 
                let p1 = r1.pos,  p2 = r2.pos 
                if(p2StateHistory.filter(e=>e == 'tooLong-reverse').length%2 == 1){//反，for marker
                    p2 = r1.pos,  p1 = r2.pos
                }
                
                
                let vec = new THREE.Vector2().subVectors(p1,p2);
                orient2dAngle = -vec.angle() //根据测量线在屏幕上的角度在旋转label，使之和屏幕上的二维线平行。
                
                let y = Math.abs(this.position.y)
                let facePlane = this.root.measure && this.root.measure.facePlane 
                let eyeDir = new THREE.Vector3().subVectors(center,camera.position)
                let clockWise = facePlane && facePlane.normal.dot(eyeDir/* e.viewport.view.direction */) < 0
                if(p1.x < p2.x){ 
                    orient2dAngle += Math.PI  //避免字是倒着的情况。（使字一直在线的下方）
                    clockWise != void 0 && (this.position.y = clockWise ? y : -y)  
                }else{
                    clockWise != void 0 && (this.position.y = clockWise ? -y : y) //使area类型的edgeLabel都在外侧
                }
                  
                //this.parent.text && console.log(this.parent.text, clockWise, this.position.y, e.viewport.name   /* THREE.Math.radToDeg(angle), p1.x < p2.x */   )
                 
            
                setVisi(true)
              
            } 
                
                 
            let parentQua = this.root.parent.getWorldQuaternion(new THREE.Quaternion)
            this.root.quaternion.multiplyQuaternions(parentQua.invert(),camera.quaternion)    //乘上parentQua.invert()是为了中和掉父结点的qua，使只剩下camera.quaternion
        
            if(orient2dAngle){ 
                let qua = new THREE.Quaternion().setFromAxisAngle(new THREE.Vector3(0,0,1),  orient2dAngle) 
                this.root.quaternion.multiply(qua) 
            }
        
        }
        
        //scale
        var info = this.sizeInfo
        if(info){
            this.root.updateMatrix();//先更新，getWorldPosition才能得到正确的
            this.root.updateMatrixWorld(true)
            
            
            var scale
            if(info.nearBound == void 0 && info.farBound != void 0 || info.nearBound != void 0 && info.farBound == void 0){//仅限制最大或最小的话，不判断像素大小，直接限制mesh的scale
                //这个判断也可以写到getScaleForConstantSize里，可以更严谨控制像素宽度，这里只简单计算大小
                var dis = camera.position.distanceTo(this.root.getWorldPosition(new THREE.Vector3()))
                if(info.farBound == void 0 && dis < info.nearBound){
                    scale = info.scale * dis / info.nearBound
                }else if(info.nearBound == void 0  && dis > info.farBound){
                    scale = info.scale * dis / info.farBound
                }else{
                    scale = info.scale
                }
            }else{ 
                scale = math.getScaleForConstantSize($.extend(info,{//规定下最小最大像素 
                    camera , position:this.root.getWorldPosition(new THREE.Vector3()) ,
                    resolution: e.viewport.resolution//2
                })) 
            } 
            
            if(!isNaN(scale)){
                this.root.scale.set(scale, scale, scale); 
            } 
        }
        
        
        this.updateMatrix();
        //this.root.updateMatrixWorld(true)
        //console.log(this.root.text, this.root.matrix.elements)
        this.matrixMap.set(e.viewport, this.matrix.clone())
        if(this.root != this){
            this.root.updateMatrix(); //因this.position可能在两个viewport不同          
            this.matrixMapRoot.set(e.viewport, this.root.matrix.clone())
        }
         
        this.needsUpdate = false
        this.useViewport = e.viewport
         
    }
    
    applyMatrix(e){
        if(!e)e = {viewport:viewer.mainViewport}//随便写一个viewport
        
        let visi = this.visiMap.get(e.viewport) //还原可见性
        Potree.Utils.updateVisible(this, 'unableCompute', visi == false ? false : true );  
        /* if(e.viewport.name == 'mapViewport' && visi && this.visiMap.get(viewer.mainViewport) == false){
            console.log(1)
        } */
        
        if(e.viewport.name == 'magnifier')return
        if(this.viewports && !this.viewports.includes(e.viewport) )return
        if( !this.root || !this.realVisible(e.viewport, e.interactables)  )return
         
        var matrix = this.matrixMap.get(e.viewport);
           
        if(!matrix){
            this.update(e)
            matrix = this.matrixMap.get(e.viewport);
            if(!matrix)return                
        }
        
        if(e.viewport == this.useViewport){
            return 
        }       
        this.useViewport = e.viewport   
         
        this.matrix.copy(matrix)  
        
         
        if(this.root != this){
            var matrix2 = this.matrixMapRoot.get(e.viewport);
            this.root.matrix.copy(matrix2) 
        }
        
        e.raycaster && this.root.updateMatrixWorld(true)//渲染前会自动updateMatrixWorld，但raycaster不会
        //console.log(this.root.name + e.viewport.name + " : "+this.root.matrixWorld.elements)
    }
    
    setUniforms(name,value){
        this.material.setUniforms(name,value) 
    }
    
     
    dispose(){
        this.removeAllListeners()
        this.parent && this.parent.remove(this)
        this.dispatchEvent('dispose')
    }
}



/* 

    let orient2d
        
    if(this.lineDir){
        this.root.updateMatrix();//先更新，getWorldPosition才能得到正确的
        this.root.updateMatrixWorld(true)
        let center = this.root.getWorldPosition(new THREE.Vector3())
        //由于两个端点容易在屏幕外，所以使用center和center加dir
        let lineDir = this.lineDir.clone();
        
        
        let r1 = Potree.Utils.getPos2d(center, camera, viewer.renderArea, e.viewport); 
        if(!r1.trueSide)return  Potree.Utils.updateVisible(this, 'unableCompute', false);// 但这句会使realVisible为false从而无法更新//console.error('!r1.trueSide') //中心点如果在背面直接不渲染了
            
        let r2, point2
        
        let p2State = '', len=1,  p2StateHistory = []
        while(p2State != 'got' && p2StateHistory.length<10){ 
            point2 = center.clone().add(lineDir.multiplyScalar(len));
             
            r2 = Potree.Utils.getPos2d(point2, camera, viewer.renderArea, e.viewport);  
            if(!r2.trueSide){ //很少遇到点2在背面的
                if(!p2StateHistory.includes('tooLong-reverse')){
                    p2State = 'tooLong-reverse'  //先尝试反向
                    len = -len
                }else{
                    p2State = 'tooLong'
                    len = len / 2
                }
            }else{
                let dis = r2.pos.distanceTo(r1.pos)
                if(dis == 0){
                    //console.log('dis == 0') 
                    Potree.Utils.updateVisible(this, 'unableCompute', false)
                    return
                    break
                } 
                if(dis<10 && !p2StateHistory.includes('tooLong')){//和r1的屏幕距离太近，要加长,否则精度过低
                    p2State = 'tooShort'
                    len = 100/dis * len  
                }else{ 
                    p2State = 'got'; break;
                }
            } 
            p2StateHistory.push(p2State) 
        }
        //console.log(p2StateHistory,len)
        
        if(!r2.trueSide){
            return  Potree.Utils.updateVisible(this, 'unableCompute', false)//, console.log('  !r2.trueSide', )
        }
         
        Potree.Utils.updateVisible(this, 'unableCompute', true)
        let p1 = r1.pos,  p2 = r2.pos
        let vec = new THREE.Vector2().subVectors(p1,p2);
        let angle = -vec.angle() //根据测量线在屏幕上的角度在旋转label，使之和屏幕上的二维线平行。
        if(p1.x < p2.x) angle += Math.PI  //避免字是倒着的情况
         
        orient2d = new THREE.Quaternion().setFromAxisAngle(new THREE.Vector3(0,0,1),  angle)
        //console.log(this.parent.text, THREE.Math.radToDeg(angle), p1.x < p2.x   )
    }

    let parentQua = this.root.parent.getWorldQuaternion(new THREE.Quaternion)
    this.root.quaternion.multiplyQuaternions(parentQua.invert(),camera.quaternion)    //乘上parentQua.invert()是为了中和掉父结点的qua，使只剩下camera.quaternion

    if(this.lineDir){ 
        this.root.quaternion.multiply(orient2d) 
    }



 */