// DrawTriangleFlag
/*
绘制三角形旗帜
 */
class DrawTriangleFlag {
    constructor(arg) {
        this.viewer = arg.viewer;
        this.Cesium = arg.Cesium;
        this.identificationPoint = null; //标识点位
        this.TriangleFlag = null; 
        this.TriangleFlagLast = null; // 三角形旗帜数据
        this.positions = [];  // 经纬度
        this.entitiesPoint = [];   // 实体点位
        this.entitiesTriangleFlag = [];  
        this.TriangleFlagData = null; 
        this.DrawStartEvent = new Cesium.Event(); //开始绘制事件
        this.DrawEndEvent = new Cesium.Event(); //结束绘制事件 
		
		/* 通用参数集合 */
		this._param = {
			id: "DrawStraightArrow",
			polygonColor: 'rgba(0,255,0,0.5)', //面填充颜色
			outlineColor: 'rgba(255, 255, 255, 1)', //边框颜色
			outlineWidth: 1, //边框宽度
		}
		
		/* 创建面材质 */
		this.polygonMaterial = Cesium.Color.fromCssColorString(this._param.polygonColor);
		/* 创建线材质 */
		// this.outlineMaterial = new Cesium.PolylineDashMaterialProperty({//曲线
		// 	dashLength: 16,
		// 	color: Cesium.Color.fromCssColorString(this._param.outlineColor)
		// });
		this.outlineMaterial = Cesium.Color.fromCssColorString(this._param.outlineColor);
    }
 
    //返回三角形旗帜数据
    getData() {
        return this.TriangleFlagData;
    }

    // 修改编辑调用计算
    computePosition(data){
        //计算面
        let $this = this
        var lnglatArr = [];
        for (var i = 0; i < data.length; i++) {
            var lnglat = $this.cartesianToLatlng(data[i]);
            lnglatArr.push(lnglat)
        }
        let startPoint = lnglatArr[0];
        // 取最后一个
        let endPoint =lnglatArr[lnglatArr.length - 1]
        let point0 = lnglatArr[0];
        var point1 = [endPoint[0], (startPoint[1] + endPoint[1]) / 2]
        var point2 = [startPoint[0], (startPoint[1] + endPoint[1]) / 2]
        var point3 =[startPoint[0], endPoint[1]]
        let componentspolygon = $this.Cesium.Cartesian3.fromDegreesArray([...point0, ...point1, ...point2, ...point0])
        let componentspolyline = $this.Cesium.Cartesian3.fromDegreesArray([...point0, ...point1, ...point2, ...point0,...point3])
        let PolygonHierarchy = new $this.Cesium.PolygonHierarchy(componentspolygon)
        $this.TriangleFlagData = lnglatArr;
        console.log([PolygonHierarchy,componentspolyline])
        return [PolygonHierarchy,componentspolyline];
    }
 
    //加载
    addload(data) {
        var $this = this;
        if (data.length < 2) return;
        let startPoint = data[0];
        // 取最后一个
        let endPoint =data[data.length - 1]
        let point0 = data[0];
        var point1 = [endPoint[0], (startPoint[1] + endPoint[1]) / 2]
        var point2 = [startPoint[0], (startPoint[1] + endPoint[1]) / 2]
        var point3 =[startPoint[0], endPoint[1]]
        let componentspolygon = $this.Cesium.Cartesian3.fromDegreesArray([...point0, ...point1, ...point2, ...point0])
        let componentspolyline = $this.Cesium.Cartesian3.fromDegreesArray([...point0, ...point1, ...point2, ...point0,...point3])
        var shape = this.viewer.entities.add({
            Type:'DrawTriangleFlag',
            Position:data,
            id:data.id || $this.objId,
            polygon: {
                hierarchy: new $this.Cesium.PolygonHierarchy(componentspolygon),
                extrudedHeight: 1,
                material: $this.Cesium.Color.RED,
            },
            polyline: {
                //使用cesium的peoperty
                positions: componentspolyline,
                show: true,
                material: $this.Cesium.Color.YELLOW,
                width: 5,
                clampToGround: true
            }
        });
        $this.entitiesTriangleFlag.push(shape);
        return shape;
    }
 
    //开始创建
    startCreate(drawType) {
        this.drawType = drawType;
        var $this = this;
        this.handler = new this.Cesium.ScreenSpaceEventHandler(this.viewer.scene.canvas);
        this.handler.setInputAction(function (evt) { //单机开始绘制
            //屏幕坐标转地形上坐标
            var cartesian = $this.getCatesian3FromPX(evt.position);
            if ($this.positions.length == 0) {
                $this.positions.push(cartesian.clone());
                $this.identificationPoint = $this.createPoint(cartesian);
                $this.createPoint(cartesian);// 绘制点
                $this.positions.push(cartesian);
            }
            // if ($this.positions.length == 2) {
            //     $this.positions.push(cartesian);
            // }
            
        }, $this.Cesium.ScreenSpaceEventType.LEFT_CLICK);
        this.handler.setInputAction(function (evt) { //移动时绘制线
            if ($this.positions.length < 2) return;
            var cartesian = $this.getCatesian3FromPX(evt.endPosition);
            if (!$this.Cesium.defined($this.TriangleFlag)) {
                $this.TriangleFlag = $this.createTriangleFlag();
            }
            $this.identificationPoint.position.setValue(cartesian);
            if ($this.TriangleFlag) {
                $this.positions.pop();
                $this.positions.push(cartesian);
            }
        }, $this.Cesium.ScreenSpaceEventType.MOUSE_MOVE);
        this.handler.setInputAction(function (evt) {
            if (!$this.TriangleFlag) return;
            var cartesian = $this.getCatesian3FromPX(evt.position);
            $this.positions.pop();
            $this.positions.push(cartesian);
            $this.createPoint(cartesian);// 绘制点
            $this.TriangleFlagData = $this.positions.concat();
            $this.viewer.entities.remove($this.TriangleFlag); //移除
            $this.TriangleFlag = null;
            $this.positions = [];
            $this.identificationPoint.position.setValue(cartesian);
            var lnglatArr = [];
            for (var i = 0; i < $this.TriangleFlagData.length; i++) {
                var lnglat = $this.cartesianToLatlng($this.TriangleFlagData[i]);
                lnglatArr.push(lnglat)
            }
            $this.TriangleFlagData = lnglatArr;
            var TriangleFlag = $this.addload([$this.TriangleFlagData[0],$this.TriangleFlagData[$this.TriangleFlagData.length -1 ]]); //加载
            $this.entitiesTriangleFlag.push(TriangleFlag);
            $this.TriangleFlagLast = TriangleFlag;
            $this.clearPoint();
            $this.destroy()
        }, $this.Cesium.ScreenSpaceEventType.RIGHT_CLICK);
    }
 
    //创建点
    createPoint(cartesian) {
        var $this = this;
        var point = this.viewer.entities.add({
            position: cartesian,
            point: {
                pixelSize: 10,
                color: $this.Cesium.Color.RED,
                heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
            }
        });
        $this.entitiesPoint.push(point);
        return point;
    }
 
    //创建三角形旗帜
    createTriangleFlag() {
        console.log('232323')
        var $this = this;
        var polygon = this.viewer.entities.add({
            polygon: {
                hierarchy: new $this.Cesium.CallbackProperty(function () {
                    if($this.positions.length < 2) return 
                    let lonlat = [];
                    let length = $this.positions.length
                    for (let i=0; i<length; i++){
                        lonlat.push($this.cartesianToLatlng($this.positions[i]))
                    }
                    let startPoint = lonlat[0]
                    // 取最后一个
                    let endPoint =lonlat[lonlat.length - 1]
                    let point0 = lonlat[0];
                    var point1 = [endPoint[0], (startPoint[1] + endPoint[1]) / 2]
                    var point2 = [startPoint[0], (startPoint[1] + endPoint[1]) / 2]
                    var point3 =[startPoint[0], endPoint[1]]

                    let components = $this.Cesium.Cartesian3.fromDegreesArray([...point0, ...point1, ...point2, ...point0])
                    
                    return new $this.Cesium.PolygonHierarchy(components);
                }, false),
                extrudedHeight: 1,
                material: $this.Cesium.Color.RED,
            },
            polyline: {
                //使用cesium的peoperty
                positions: new $this.Cesium.CallbackProperty(function () {
                    if($this.positions.length < 2) return 
                    let lonlat = [];
                    let length = $this.positions.length
                    for (let i=0; i<length; i++){
                        lonlat.push($this.cartesianToLatlng($this.positions[i]))
                    }
                    let startPoint = lonlat[0]
                    // 取最后一个
                    let endPoint =lonlat[lonlat.length - 1]
                    let point0 = lonlat[0];
                    var point1 = [endPoint[0], (startPoint[1] + endPoint[1]) / 2]
                    var point2 = [startPoint[0], (startPoint[1] + endPoint[1]) / 2]
                    var point3 =[startPoint[0], endPoint[1]]

                    let components = $this.Cesium.Cartesian3.fromDegreesArray([...point0, ...point1, ...point2, ...point0,...point3])
                    return components
                }, false),
                show: true,
                material: $this.Cesium.Color.YELLOW,
                width: 5,
                clampToGround: true
            }
        });
        $this.entitiesTriangleFlag.push(polygon);
        return polygon;
    }

    cartesianToLatlng(cartesian) {
        var latlng = this.viewer.scene.globe.ellipsoid.cartesianToCartographic(cartesian);
        var lat = this.Cesium.Math.toDegrees(latlng.latitude);
        var lng = this.Cesium.Math.toDegrees(latlng.longitude);
        return [lng, lat];
    }

    LatlngTocartesian(latlng) {
        let cartesian3 = this.Cesium.Cartesian3.fromDegrees(latlng[0], latlng[1]);
        return cartesian3
    }

    clearPoint() {
        this.DrawEndEvent.raiseEvent(this.TriangleFlagLast, [this.TriangleFlagData[0],this.TriangleFlagData[this.TriangleFlagData.length -1 ]], this.drawType);
        for (var i = 0; i < this.entitiesPoint.length; i++) {
            this.viewer.entities.remove(this.entitiesPoint[i]);
        }
        this.entitiesPoint = [];  //脏数据
    }
 
    //销毁
    destroy() {
        if (this.handler) {
            this.handler.destroy();
            this.handler = null;
        }
    }
 
    //清空实体对象
    clear() {
        for (var i = 0; i < this.entitiesPoint.length; i++) {
            this.viewer.entities.remove(this.entitiesPoint[i]);
        }
        for (var i = 0; i < this.entitiesTriangleFlag.length; i++) {
            this.viewer.entities.remove(this.entitiesTriangleFlag[i]);
        }
        this.identificationPoint = null; //标识点位
        this.TriangleFlag = null; 
        this.TriangleFlagLast = null; // 三角形旗帜数据
        this.positions = [];  // 经纬度
        this.entitiesPoint = [];   // 实体点位
        this.entitiesTriangleFlag = [];  
        this.TriangleFlagData = null; 
    }
 
    getCatesian3FromPX(px) {
        var cartesian;
        var ray = this.viewer.camera.getPickRay(px);
        if (!ray) return null;
        cartesian = this.viewer.scene.globe.pick(ray, this.viewer.scene);
        return cartesian;
    }
}
 
export default DrawTriangleFlag