var CalcVol = {
    upPos: [],

    downPos: [],

    upClipPos: [], //上表面最低点集合

    downClipPos: [], //下表面最高点集合

    upMinHight: -Infinity, //上表面最低点高度值

    downMaxHight: Infinity, //下表面最高点高度值

    upVolume: 0,

    centerVolume: 0,

    downVolume: 0,

    init: function (upPos, downPos) {
        this.initData(upPos, downPos);
        this.clipUpByPoint();
        this.clipBottomByPoint();
        this.createUpSolid();
        this.createDownSolid();
        var s1 = this.calculateUpVolume();
        var s2 = this.calculateDownVolume();

        return this.calculateCenterVolume(s2.height, s2.bottom);
    },

    initData: function (upPos, downPos) {
        this.upPos = upPos;
        this.downPos = downPos;
        this.upClipPos = [];
        this.downClipPos = [];
        this.upMinHight = -Infinity;
        this.downMaxHight = Infinity;
        this.upVolume = 0;
        this.centerVolume = 0;
        this.downVolume = 0;
    },

    // 上表面水平切割
    clipUpByPoint: function () {
        this.upPos.sort(this.compare("z"));
        this.upMinHight = this.upPos[0].z;
        var upClipPoints = [];
        for (var i = 0; i < this.upPos.length; i++) {
            var upEle = this.upPos[i];
            var x = upEle.x;
            var y = upEle.y;
            var z = this.upMinHight;
            this.upClipPos.push({ x: x, y: y, z: z });
            upClipPoints.push(x, y, z);
        }
    },

    // 下表面水平切割
    clipBottomByPoint: function () {
        this.downPos.sort(this.compare("z"));
        this.downMaxHight = this.downPos[this.downPos.length - 1].z;
        var downClipPoints = [];
        for (var i = 0; i < this.downPos.length; i++) {
            var downEle = this.downPos[i];
            var x = downEle.x;
            var y = downEle.y;
            var z = this.downMaxHight;
            this.downClipPos.push({ x: x, y: y, z: z });
            downClipPoints.push(x, y, z);
        }
    },

    // 创建上半部分空间体
    createUpSolid: function () {
        var vertex = this.upPos[0];
        var upSolidPolygonPoints = [];
        var fourpoints0 = [];
        var fourpoints1 = [];
        for (var i = 1; i < this.upPos.length; i++) {
            var upEle = this.upPos[i];
            var upClipEle = this.upClipPos[i];
            var upClipEle1 = this.upClipPos[this.upPos.length - i];
            fourpoints0.push(upEle.x, upEle.y, upEle.z);
            fourpoints1.push(upClipEle1.x, upClipEle1.y, upClipEle1.z);
            var curPolygonPoints = [
              vertex.x,
              vertex.y,
              vertex.z,
              upEle.x,
              upEle.y,
              upEle.z,
              upClipEle.x,
              upClipEle.y,
              upClipEle.z,
            ];
            upSolidPolygonPoints.push(curPolygonPoints);
        }

        var fourpoints = fourpoints0.concat(fourpoints1); //上半部分顶点对应的那个面的四个顶点
        upSolidPolygonPoints.push(fourpoints);
        for (var n = 0; n < upSolidPolygonPoints.length; n++) {
            var element = upSolidPolygonPoints[n];
        }
    },

    // 创建下半部分空间体
    createDownSolid: function () {
        var vertex = this.downPos[this.downPos.length - 1];
        var downSolidPolygonPoints = [];
        var fourpoints0 = [];
        var fourpoints1 = [];
        for (var i = 0; i < this.downPos.length - 1; i++) {
            var downEle = this.downPos[i];
            var downClipEle = this.downClipPos[i];
            var downClipEle1 = this.downClipPos[this.downPos.length - 2 - i];
            fourpoints0.push(downEle.x, downEle.y, downEle.z);
            fourpoints1.push(downClipEle1.x, downClipEle1.y, downClipEle1.z);
            var curPolygonPoints = [
              vertex.x,
              vertex.y,
              vertex.z,
              downEle.x,
              downEle.y,
              downEle.z,
              downClipEle.x,
              downClipEle.y,
              downClipEle.z,
            ];
            downSolidPolygonPoints.push(curPolygonPoints);
        }

        var fourpoints = fourpoints0.concat(fourpoints1); //下半部分顶点对应的那个面的四个顶点
        downSolidPolygonPoints.push(fourpoints);
        for (var n = 0; n < downSolidPolygonPoints.length; n++) {
            var element = downSolidPolygonPoints[n];
        }
    },

    // 计算上半部分体积//四棱锥体积计算公式：体积=底面积*高/3
    calculateUpVolume: function () {
        // 底面积=（上底+下底）*高/2，上底长度和下底长度
        //console.log("计算上半部分的底面积：", this.upPos, this.upClipPos);

        var clipLine = [];
        var upAndDownDistance = 0;
        for (var i = 1; i < this.upPos.length; i++) {
            var upEle = this.upPos[i];
            var upClipEle = this.upClipPos[i];
            clipLine.push(upClipEle);
            var distance = this.getSpaceDistance(upEle, upClipEle);
            //console.log("底面上下底边长度" + i, distance);
            upAndDownDistance += distance;
        }

        var height = this.getSpaceDistance(clipLine[0], clipLine[1]);
        //console.log("底面的高", height);
        var bottomArea = (upAndDownDistance * height) / 2;
        //console.log("底面积", bottomArea);

        //高
        var pt = turf.point([this.upClipPos[0].x, this.upClipPos[0].y]);
        var line = turf.lineString([
          [this.upClipPos[1].x, this.upClipPos[1].y],
          [this.upClipPos[2].x, this.upClipPos[2].y],
        ]);

        var heightDistance = turf.pointToLineDistance(pt, line) * 1000;
        //console.log("顶点到底面的高：", heightDistance);
        this.upVolume = (bottomArea * heightDistance) / 3;
        //console.log("上半部分体积（黄色）：", this.upVolume);

        return { height: heightDistance, bottom: height };
    },

    // 计算下半部分体积//四棱锥体积计算公式：体积=底面积*高/3
    calculateDownVolume: function () {
        // 底面积=（上底+下底）*高/2
        // 上底长度和下底长度
        //console.log("计算下半部分的底面积：", this.downPos, this.downClipPos);
        var clipLine = [];
        var upAndDownDistance = 0;
        for (var i = 0; i < this.downPos.length - 1; i++) {
            var upEle = this.downPos[i];
            var upClipEle = this.downClipPos[i];
            clipLine.push(upClipEle);
            var distance = this.getSpaceDistance(upEle, upClipEle);
            //console.log("底面上下底边长度" + i, distance);
            upAndDownDistance += distance;
        }

        var height = this.getSpaceDistance(clipLine[0], clipLine[1]);
        //console.log("底面的高", height);
        var bottomArea = (upAndDownDistance * height) / 2;
        //console.log("底面积", bottomArea);

        //高
        var pt = turf.point([this.downClipPos[2].x, this.downClipPos[2].y]);
        var line = turf.lineString([
          [this.downClipPos[0].x, this.downClipPos[0].y],
          [this.downClipPos[1].x, this.downClipPos[1].y],
        ]);

        var heightDistance = turf.pointToLineDistance(pt, line) * 1000;
        //console.log("顶点到底面的高：", heightDistance);
        this.downVolume = (bottomArea * heightDistance) / 3;
        //console.log("下半部分体积（绿色）：", this.downVolume);

        return { height: heightDistance, bottom: height };
    },

    // 计算中间部分体积//三棱柱体积计算公式：体积=底面积*高
    //height：三棱柱底面三角形的高，bottom：三棱柱底面三角形的底边
    calculateCenterVolume: function (height, bottom) {
        //底面积
        var area = (height * bottom) / 2;
        //console.log("底面三角形面积：", area);
        var h = Math.abs(this.upClipPos[0].z - this.downClipPos[2].z); //三棱柱高
        this.centerVolume = area * h;
        //console.log("中间部分三棱柱体积：", this.centerVolume);
        var volume = this.upVolume + this.downVolume + this.centerVolume;
        //console.log("当前空间立方体的体积是(m³)：", volume);

        return volume;
    },

    // 空间两点间距离，单位m
    getSpaceDistance: function (pos1, pos2) {
        var h = Math.abs(pos1.z - pos2.z);
        var from = turf.point([pos1.x, pos1.y]);
        var to = turf.point([pos2.x, pos2.y]);
        var distance = turf.distance(from, to); //这里计算出来的单位是km，要转换成m，所以后面开平方的时候*1000
        var result = Math.sqrt(Math.pow(distance * 1000, 2) + Math.pow(h, 2));

        return result;
    },

    //数组根据某一字段从高到低排序
    compare: function (property) {
        return function (a, b) {
            var value1 = a[property];
            var value2 = b[property];
            return value1 - value2;
        };
    }
};