import * as Cesium from 'cesium'

export const getLngLatDistance = (lat1: number, lng1: number, lat2: number, lng2: number) => {
  const radLat1 = (lat1 * Math.PI) / 180.0
  const radLat2 = (lat2 * Math.PI) / 180.0
  const a = radLat1 - radLat2
  const b = (lng1 * Math.PI) / 180.0 - (lng2 * Math.PI) / 180.0
  let s =
    2 *
    Math.asin(
      Math.sqrt(Math.pow(Math.sin(a / 2), 2) + Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)),
    )
  s = s * 6378.137 // EARTH_RADIUS;
  s = Math.round(s * 10000) / 10000
  return s * 1000
}

// 获取限polyline长度
export const getPolylineLength = (entity: any) => {
  let length = 0

  // 获取Polyline的所有顶点位置
  const positions = entity.polyline.positions.getValue()

  for (let i = 0; i < positions.length - 1; ++i) {
    const startPosition = positions[i]
    const endPosition = positions[i + 1]

    // 使用Cesium提供的distanceBetween函数计算两个顶点之间的距离
    const distance = Cesium.Cartesian3.distance(startPosition, endPosition)

    // 将每个顶点之间的距离相加得到总长度
    length += distance
  }

  return length
}

// 创建三角广告牌
export const createTriangleMarker = (title: string | number, color: string) => {
  // 创建canvas绘制广告牌
  const billboard = document.createElement('canvas')
  billboard.width = 30
  billboard.height = 30
  const ctx: HTMLCanvasElement | any = billboard.getContext('2d')
  ctx.beginPath()
  ctx.moveTo(0, 0)
  ctx.lineTo(30, 0)
  ctx.lineTo(15, 22)
  ctx.fillStyle = color
  ctx.fill()
  ctx.font = '18px serif'
  ctx.fillStyle = '#ffffff'
  ctx.fillText(title, 10, 15)
  ctx.closePath()
  return billboard
}

// 获取当前经纬度海拔
export const getHaeHeight = (
  start: { longitude: number; latitude: number; height: number },
  end: { longitude: number; latitude: number; height: number },
) => {
  const ellipsoid = Cesium.Ellipsoid.WGS84 // 选择合适的椭圆体模型
  // const { longitude, latitude, height } = start
  // const { longitude: endLng, latitude: endLat, height: endHeight } = end
  // const startC3Position = new Cesium.Cartographic(longitude, latitude, height)
  // const endC3Position = new Cesium.Cartographic(endLng, endLat, endHeight)
  // const startCartesianPosition = ellipsoid.cartographicToCartesian(startC3Position)
  // const endCartesianPosition = ellipsoid.cartographicToCartesian(endC3Position)
  // // 计算两个位置之间的距离
  // const distance = new Cesium.EllipsoidGeodesic(startCartesianPosition, endCartesianPosition, ellipsoid)
  // return distance
  const { longitude, latitude, height } = end
  const cartographic = Cesium.Cartographic.fromDegrees(longitude, latitude, height)
  const cartesianPosition = ellipsoid.cartographicToCartesian(cartographic)
  const haeHeight = ellipsoid.cartesianToCartographic(cartesianPosition).height
  return haeHeight
}

// Cesium Cartesian3 转正常经纬度
export const cartesian3Convert = (cartesian3Position: Cesium.Cartesian3, viewer: { scene: { globe: { ellipsoid: any } } }) => {
  // 转换为经纬度
  const ellipsoid = viewer.scene.globe.ellipsoid
  const cartographicPosition = Cesium.Cartographic.fromCartesian(cartesian3Position, ellipsoid)
  const longitude = Cesium.Math.toDegrees(cartographicPosition.longitude)
  const latitude = Cesium.Math.toDegrees(cartographicPosition.latitude)
  const height = cartographicPosition.height

  console.log('经度: ' + longitude)
  console.log('纬度: ' + latitude)
  console.log('高度: ' + height)

  return {
    longitude,
    latitude,
    height,
  }
}

// 获取当前经纬度地形数据
export const getLnglatAltitude = (longitude:any, latitude: any, viewer: any) => {
  return new Promise((resolve, reject) => {
    // 假设 viewer 已经初始化并且 terrainProvider 是有效的
    const terrainProvider = viewer?.terrainProvider;

    // 创建 Cartographic 对象
    const cartographic = Cesium.Cartographic.fromDegrees(longitude, latitude);

    // 获取地形数据的Promise
    const promise = Cesium.sampleTerrainMostDetailed(terrainProvider, [
      cartographic,
    ]);

    // 使用 Cesium.when 处理 Promise
    promise
      .then(function (updatedPositions) {
        // updatedPositions 是一个数组，包含更新后的 Cartographic 对象
        const updatedPosition = updatedPositions[0];
        const height = updatedPosition.height;

        resolve({
          longitude,
          latitude,
          height,
        });
        // 在这里，你可以使用 height 值进行后续操作
      })
      .catch(function (error) {
        // console.error('获取高程时发生错误:', error);
        reject(error);
      });
  });
};