/**
 * 高德地图3D图形绘制相关
 */

import { map, object3Dlayer } from './index_old';

// 3d图形
var _cylinder = undefined,
  // 当前绘制的图形中的最小高度
  _minH = -1,
  // 当前绘制的图形中的最大高度
  _maxH = -1;

//监测数据
var _factorDatas = {
    lnglats: [],
    heights: [],
    type: ''
  },
  //当前选中的监测因子数据
  _factor = {},
  _zoomFirst = true;

function onMapZoom() {
  // 首次地图缩放监听不执行（因为设定监听函数后会立即执行一次，可能官方函数有相关参数，后续待修改）
  if (_zoomFirst) {
    _zoomFirst = false;
    return;
  }
  const fDatas = _factorDatas;
  const factor = _factor;
  drawMesh(fDatas, factor);
  // console.log(map.getZoom());
}

var _maxHeight = 1000,
  _minHeight = 100,
  _lastZoom = -1;
/**
 * 获取当前地图缩放等级下的绘制高度缩放比例
 * @param {*} minH 当前监测数据的最小高度
 * @param {*} maxH 当前监测数据的最大高度
 */
function _getScale(minH, maxH) {
  var zoom = map.getZoom();
  if (_lastZoom == -1) {
    _lastZoom = zoom;
  } else if (_lastZoom <= 8) {
    _lastZoom = zoom;
    return;
  } else if (_lastZoom >= 18) {
    _lastZoom = zoom;
    return;
  }
  if (zoom <= 8) {
    _maxHeight = 10000;
    _minHeight = 1000;
  } else if (zoom <= 9) {
    _maxHeight = 9000;
    _minHeight = 900;
  } else if (zoom <= 10) {
    _maxHeight = 8000;
    _minHeight = 800;
  } else if (zoom <= 11) {
    _maxHeight = 7000;
    _minHeight = 700;
  } else if (zoom <= 12) {
    _maxHeight = 6000;
    _minHeight = 600;
  } else if (zoom <= 14) {
    _maxHeight = 5000;
    _minHeight = 500;
  } else if (zoom <= 15) {
    _maxHeight = 4500;
    _minHeight = 450;
  } else if (zoom <= 16) {
    _maxHeight = 4000;
    _minHeight = 400;
  } else if (zoom <= 17) {
    _maxHeight = 2500;
    _minHeight = 250;
  } else if (zoom > 17) {
    _maxHeight = 1000;
    _minHeight = 100;
  }

  var scale = (_maxHeight - _minHeight) / (maxH - minH);
  return scale;
}

/**
 * 绘图
 */
function drawMesh(fDatas, factor, merge) {
  const lnglats_GD = fDatas.lnglats_GD;
  const coors = fDatas.coors_GD;
  const heights = factor.heights;
  const colors = factor.colors;
  const bColor = factor.bottomColor;
  const bColors = factor.bottomColors;

  // eslint-disable-next-line no-undef
  var cylinder = new AMap.Object3D.Mesh();
  cylinder.backOrFront = 'both';
  cylinder.transparent = true;

  var geometry = cylinder.geometry;

  const scale = _getScale(_minH, _maxH);
  for (let i = 0; i < coors.length; i++) {
    var r = lnglats_GD[i];
    var lastP = lnglats_GD[i - 1];
    var p = coors[i];
    var h = (heights[i] - _minH) * scale + _minHeight;
    if (heights[i] == -1) {
      h = -1;
    }

    geometry.vertices.push(p.x, p.y, 0); //底部顶点
    geometry.vertices.push(p.x, p.y, 0 - h); //顶部顶点

    if (i > 0) {
      // eslint-disable-next-line no-undef
      var distance = AMap.GeometryUtil.distance(r, lastP);
      //两个数据点最小间隔时间为4s，假设车速按照120km/h计算，4s行驶最大距离作为132米，
      //设定超过1分钟的数据绘制特殊的连线
      if (distance <= 500 && h != -1) {
        var bottomIndex = i * 2;
        var topIndex = bottomIndex + 1;
        var lastBottomIndex = bottomIndex - 2;
        var lastTopIndex = bottomIndex - 1;
        geometry.faces.push(bottomIndex, topIndex, lastTopIndex);
        geometry.faces.push(bottomIndex, lastBottomIndex, lastTopIndex);
      }
    }

    geometry.vertexColors.push.apply(geometry.vertexColors, bColors[i]); //底部顶点颜色
    geometry.vertexColors.push.apply(geometry.vertexColors, colors[i]); //顶部顶点颜色
  }

  // 7.根据合并选项重置或新增当前缓存数据
  if (merge != true) {
    _factorDatas = fDatas;
    _factor = factor;
    if (_cylinder != undefined) {
      object3Dlayer.remove(_cylinder);
    }
  } else {
    // _factorDatas.lnglats.push.apply(
    //   _factorDatas.lnglats,
    //   lnglats_GD
    // );
    // _factorDatas.coors.push.apply(_factorDatas.coors, coors);
    // _factorDatas.heights.push.apply(_factorDatas.heights, heights);
    // _factorDatas.colors.push.apply(_factorDatas.colors, colors);
    // _factorDatas.bottomColor = bColor;
  }
  object3Dlayer.add(cylinder);
  /**************test ****************/
  // object3Dlayer.on('mouseover', function (e) {
  //   console.log(
  //     `鼠标移入覆盖物! [${e.lnglat.getlng()}, ${e.lnglat.getLat()}]`
  //   );
  // });
  /**************test ****************/
  _cylinder = cylinder;
}

export default {
  drawMesh: drawMesh,
  /**
   * 绘制3D走行路线图
   * @param fDatas 完整监测数据
   * @param factor 当前展示的监测因子对象
   * @param merge 是否和之前绘制的图形合并
   * @param setCenter 镜头是否自动移动至图形中心
   */
  drawRoadMap(fDatas, factor, merge, setCenter) {
    const lnglats_GD = fDatas.lnglats_GD;
    const heights = factor.heights;

    // 1.关闭地图缩放监听
    map.off('zoomend', onMapZoom);

    // 2.计算绘图高度的边界值
    if (merge != true) {
      var minH = _minH < 0 ? heights[0] : _minH;
      var maxH = _maxH < 0 ? heights[0] : _maxH;
      for (let i = 0; i < heights.length; i++) {
        const h = heights[i];
        minH = Math.min(minH, h);
        maxH = Math.max(maxH, h);
      }
      _minH = minH;
      _maxH = maxH;
    }

    // 5.绘制3D图形
    this.drawMesh(fDatas, factor, merge);

    // 缩放地图到合适的视野级别
    // map.setFitView()

    // 6.开启地图缩放监听
    if (lnglats_GD.length > 0) {
      map.on('zoomend', onMapZoom);
    }
  }
};