import * as Cesium from 'cesium'
import CesiumNavigation from 'cesium-navigation-es6'
import 'cesium/Build/Cesium/Widgets/widgets.css'

const getCatesian3FromPX = (viewer, px) => {
  const picks = viewer.scene.drillPick(px)
  viewer.scene.render()
  let cartesian
  let isOn3dtiles = false
  for (var i = 0; i < picks.length; i++) {
    if (picks[i] && picks[i].primitive && picks[i].primitive instanceof Cesium.Cesium3DTileset) {
      //模型上拾取
      isOn3dtiles = true
      break
    }
  }
  if (isOn3dtiles) {
    cartesian = viewer.scene.pickPosition(px)
  } else {
    var ray = viewer.camera.getPickRay(px)
    if (!ray) return null
    cartesian = viewer.scene.globe.pick(ray, viewer.scene)
  }
  return cartesian
}

export default class MyCesium {
  static ImageryProviderUrl = '/map/mapWX/{z}/{x}/{y}.jpg'
  static RoadProviderUrl = ''
  static TerrainProviderUrl = '/map/mapDem/'
  static center = [116.39742, 39.90906, 2000000]
  static ENTITY_TYPES = {
    WARZONE: 1,
    SAFEZONE: 2,
    MODEL: 3,
    IMAGE: 4,
    ROUTE: 5,
    LINE: 6, // 两个模型之间的连线
    POINT_PLANNING: 7, // 规划点
    GRAPHICS: 8, // 折线
    AIR_ROUTE: 9, // 航路
    ROAMING_PLANE: 10,
  }

  viewer = null
  // 选中模型
  selectedModel = null
  // 右鍵菜單
  contextMenu = {
    visible: false,
    left: 0,
    top: 0,
  }
  // 未完成的在地图上移动类的操作
  operations = []

  constructor(dom, options = {}) {
    const imageryProvider = new Cesium.UrlTemplateImageryProvider({
      url: window._CONFIG.ImageryProviderUrl || MyCesium.ImageryProviderUrl,
      tilingScheme: new Cesium.WebMercatorTilingScheme(),
      maximumLevel: 15,
    })
    const roadProvider = new Cesium.UrlTemplateImageryProvider({
      url: window._CONFIG.RoadProviderUrl || MyCesium.RoadProviderUrl,
      tilingScheme: new Cesium.WebMercatorTilingScheme(),
      maximumLevel: 15,
      format: 'image/png',
    })
    const terrainProvider = new Cesium.CesiumTerrainProvider({
      url: window._CONFIG.TerrainProviderUrl || MyCesium.TerrainProviderUrl,
    })

    const viewer = new Cesium.Viewer(dom, {
      shouldAnimate: true, // 粒子效果
      geocoder: false, // 是否显示位置查找工具（true表示是，false表示否）
      homeButton: false, // 是否显示首页位置工具
      sceneModePicker: false, // 是否显示视角模式切换工具
      baseLayerPicker: false, // 是杏显示默认图层选择工具
      navigationHelpButton: false, // 是否显示导航帮助工具
      animation: false, // 是杏显示动画工具
      timeline: false, // 是否显示时间轴工具
      fullscreenButton: false, // 是否显示全屏按钮工具
      imageryProvider,
      terrainProvider,
      infoBox: false, // 是否显示信息框
      selectionIndicator: false, // 是否显示选中实体时的绿框
    })
    this.viewer = viewer

    const { center = MyCesium.center } = options

    // viewer.scene.globe.depthTestAgainstTerrain = true

    viewer.imageryLayers.addImageryProvider(roadProvider)
    viewer.camera.setView({
      destination: Cesium.Cartesian3.fromDegrees(...center),
    })

    // 不显示Cesium的Logo
    viewer._cesiumWidget._creditContainer.style.display = 'none'
    viewer.scene.sun.show = true //太阳和月亮
    viewer.scene.moon.show = true
    viewer.scene.skyAtmosphere.show = true //大气层,显示天空颜色
    // 设置外天空盒
    viewer.scene.skyBox = new Cesium.SkyBox({
      sources: {
        positiveX: '/images/Standard-Cube-Map/px1.png',
        negativeX: '/images/Standard-Cube-Map/nx1.png',
        positiveY: '/images/Standard-Cube-Map/pz.png',
        negativeY: '/images/Standard-Cube-Map/nz1.png',
        positiveZ: '/images/Standard-Cube-Map/py.png',
        negativeZ: '/images/Standard-Cube-Map/ny1.png',
      },
    })
    viewer.scene.skyBox.show = true //天空盒

    // 创建指北针小部件并将其添加到地图
    new CesiumNavigation(viewer, {
      // 用于在使用重置导航重置地图视图时设置默认视图控制。接受的值是Cesium.Cartographic 和Cesium.Rectangle.
      defaultResetView: Cesium.Cartographic.fromDegrees(...center),
      // 用于启用或禁用罗盘。true是启用罗盘，false是禁用罗盘。默认值为true。如果将选项设置为false，则罗盘将不会添加到地图中。
      enableCompass: true,
      // 用于启用或禁用缩放控件。true是启用，false是禁用。默认值为true。如果将选项设置为false，则缩放控件 将不会添加到地图中。
      enableZoomControls: true,
      // 用于启用或禁用距离图例。true是启用，false是禁用。默认值为true。如果将选项设置为false，距离图例将不会添加到地图中。
      enableDistanceLegend: true,
      // 用于启用或禁用指南针外环。true是启用，false是禁用。默认值为true。如果将选项设置为false，则该环将可见但无效。
      enableCompassOuterRing: true,
    })

    const handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas)
    handler.setInputAction(({ position }) => {
      if (this.selectedModel) {
        this.deselectModel(this.selectedModel)
        this.selectedModel = null
      }
      const pickedObject = viewer.scene.pick(position)
      if (!Cesium.defined(pickedObject) || !pickedObject.id) {
        window.Emit('pickedObject', null)
        return
      }
      const entity = pickedObject.id
      if (
        !entity.properties ||
        (entity.properties.type != MyCesium.ENTITY_TYPES.MODEL && entity.properties.type != MyCesium.ENTITY_TYPES.IMAGE)
      ) {
        window.Emit('pickedObject', null)
        return
      }
      this.selectedModel = entity
      this.selectModel(entity)
      window.Emit('selectedModel', {
        id: entity.id,
      })
    }, Cesium.ScreenSpaceEventType.LEFT_CLICK)

    // 鼠标右键事件
    handler.setInputAction(({ position }) => {
      const pickedObject = viewer.scene.pick(position)
      if (!Cesium.defined(pickedObject) || !pickedObject.id) return
      const entity = pickedObject.id
      const properties = entity.properties
      if (
        !properties ||
        !properties.type ||
        (properties.type != MyCesium.ENTITY_TYPES.MODEL && properties.type != MyCesium.ENTITY_TYPES.IMAGE)
      ) {
        return
      }
      const nomove = properties.nomove
      if (selectedModel && entity.id == selectedModel.id && !(nomove && nomove.valueOf())) {
        this.showContextMenu(entity)
        this.cancelPreviousOperation()
      }
    }, Cesium.ScreenSpaceEventType.RIGHT_CLICK)

    // shift + 左键事件
    handler.setInputAction(
      ({ position }) => {
        const pickedObject = viewer.scene.pick(position)
        if (!Cesium.defined(pickedObject) || !pickedObject.id) return
        const entity = pickedObject.id
        if (!entity.properties || entity.properties.type != MyCesium.ENTITY_TYPES.MODEL) return
        if (this.selectedModel) {
          // 找到已有的properties中的from和to是选中的两个模型的id的线
          const find = viewer.entities.values.find((item) => {
            const props = item.properties
            if (!props || !props.type || !props.from || !props.to) return false
            return (
              (props.from == this.selectedModel.id && props.to == entity.id) ||
              (props.from == entity.id && props.to == this.selectedModel.id)
            )
          })
          // 如果已经有了，移除
          if (find) {
            viewer.entities.remove(find)
            const { from, to } = find.properties
            // 发送删除线的事件
            window.Emit('removeLineBetwenModel', {
              id: find.id,
              from: from.valueOf(),
              to: to.valueOf(),
            })
          } else {
            const id = Cesium.createGuid()
            const currentTime = viewer.clock.currentTime
            const positions = [this.selectedModel.position.getValue(currentTime), entity.position.getValue(currentTime)]
            if (positions.some((item) => !item)) {
              console.log('缺少位置信息')
              return
            }
            this.addLineBetwenModel(id, positions, selectedModel.id, entity.id)
            // 发送添加线的事件
            window.Emit('addLineBetwenModel', {
              positions,
              id,
              from: selectedModel.id,
              to: entity.id,
            })
          }
        }
      },
      Cesium.ScreenSpaceEventType.LEFT_CLICK,
      Cesium.KeyboardEventModifier.SHIFT
    )
  }

  /**
   * 选中模型
   * @param {Cesium.Entity} entity
   */
  selectModel(entity) {
    if (!entity.model) return

    const {
      properties: { color: _color },
    } = entity
    const color = _color.valueOf()
    // 设置模型轮廓效果
    entity.model.silhouetteSize = 2 // 轮廓线宽度
    entity.model.silhouetteColor = Cesium.Color.fromCssColorString(color)
    entity.label.show = true
  }
  /**
   * 取消选中模型
   * @param {Cesium.Entity} entity
   */
  deselectModel(entity) {
    if (!entity.model) return

    entity.model.silhouetteSize = 0 // 设置为0取消轮廓
    entity.label.show = false
  }

  /**
   * 显示右键菜单
   * @param {Cesium.Entity} entity
   */
  showContextMenu(entity) {
    const currentTime = viewer.clock.currentTime
    // 获取entity中心点的屏幕坐标
    const position = entity.position.getValue(currentTime)
    const screenPosition = Cesium.SceneTransforms.wgs84ToWindowCoordinates(viewer.scene, position)

    this.contextMenu.left = screenPosition.x + 20
    this.contextMenu.top = screenPosition.y
    this.contextMenu.visible = true
  }

  // 取消未完成的在地图上移动类的操作(划线之类的)
  cancelPreviousOperation() {
    this.operations.forEach((operation) => operation.clear())
    this.operations = []
  }

  /**
   * 在模型之间添加线
   * @param id
   * @param { Cesium.Cartesian3[] } positions
   * @param fromId
   * @param toId
   */
  addLineBetwenModel(id, positions, fromId, toId) {
    this.viewer.entities.add({
      id,
      polyline: {
        positions,
        width: 2,
        material: new Cesium.PolylineDashMaterialProperty({
          color: Cesium.Color.YELLOW,
          dashLength: 20, //短划线长度
        }),
        clampToGround: true,
      },
      properties: {
        type: MyCesium.ENTITY_TYPES.LINE,
        from: fromId,
        to: toId,
      },
    })
  }

  setViewerByAllCorner(leftUp, rightUp, rightDown, leftDown) {
    const [leftUpLon, leftUpLat] = leftUp
    const [rightUpLon, rightUpLat] = rightUp
    const [rightDownLon, rightDownLat] = rightDown
    const [leftDownLon, leftDownLat] = leftDown
    // 计算矩形区域的边界
    const west = Math.min(leftDownLon, leftUpLon, rightDownLon, rightUpLon)
    const east = Math.max(leftDownLon, leftUpLon, rightDownLon, rightUpLon)
    const south = Math.min(leftDownLat, leftUpLat, rightDownLat, rightUpLat)
    const north = Math.max(leftDownLat, leftUpLat, rightDownLat, rightUpLat)
    // 创建矩形范围
    const rectangle = Cesium.Rectangle.fromDegrees(west, south, east, north)
    this.viewer.camera.setView({
      destination: rectangle,
      orientation: {
        heading: 0.0,
        pitch: -Cesium.Math.PI_OVER_TWO,
        roll: 0.0,
      },
    })
  }

  /**
   * 添加军标(base64图片)
   * @param base64
   * @param x
   * @param y
   */
  addPlot(base64, { x, y }) {
    this.cancelPreviousOperation()

    const id = Cesium.createGuid()
    const position = getCatesian3FromPX(this.viewer, { x, y })
    if (!position) return

    const isEnemy = false
    const color = 'red'
    const radius = 150000

    this.viewer.entities.add({
      id,
      position,
      billboard: {
        image: base64,
        width: 50,
        height: 50,
        eyeOffset: new Cesium.Cartesian3(0.0, 0.0, -100000.0), // 使标记在远处看起来更大
      },
      ellipse: {
        semiMajorAxis: radius,
        semiMinorAxis: radius,
        material: Cesium.Color.fromCssColorString('transparent'),
        outline: true,
        outlineWidth: 1,
        outlineColor: Cesium.Color.fromCssColorString(color),
        height: 0,
      },
      properties: {
        type: MyCesium.ENTITY_TYPES.IMAGE,
        color,
        isEnemy,
        radius,
        collisions: new Set(),
      },
    })
  }
}