import { map, AMap, isDragging } from '@/utils/map/index'
import marks from '@/utils/map/marks'

/**
 * 坐标集合的最西南角和最东北角
 * @param {*} list
 *  list 是接口获取的点 的数组
 */
const getBound = (list) => {
  const offset = 0.05
  let south = null
  let west = null
  let north = null
  let east = null
  for (let item of list) {
    // 排除无效经纬度
    if (item[0] == 0 && item[1] == 0) {
      continue
    }
    if ((west && item[0] < west) || !west) {
      west = item[0] - offset
    }
    if ((south && item[1] < south) || !south) {
      south = item[1] - offset
    }
    if ((east && item[0] > east) || !east) {
      east = item[0] + offset
    }
    if ((north && item[1] > north) || !north) {
      north = item[1] + offset
    }
  }
  if (!south || !west || !north || !east) {
    return { sw: null, ne: null }
  } else {
    return { sw: [west, south], ne: [east, north] }
  }
}

/**
 * 根据中心点出发的半径，得到合适的地图缩放系数
 * 高德地图缩放系数每减少1，则地图展示的实际距离放大1倍
 * 高德地图缩放系数范围[3, 18]
 * @param {*} d
 */
const distanceToZoom = (d) => {
  let baseDis = 250,
    z = 0
  while (baseDis < d) {
    baseDis *= 2
    z++
  }

  // 多余的地图缩放系数
  const x = (baseDis - d) / (baseDis / 2)
  z -= x
  z = z < 0 ? 0 : z

  z = 18 - z
  z = z < 3 ? 3 : z
  return z
}

export default {
  setCenter(lnglat, ignore = false) {
    if (!ignore && isDragging) {
      return
    }
    var now = new Date()
    if (this.lasttime == undefined || now.getTime() - this.lasttime.getTime() >= 200) {
      map.setCenter(lnglat)
      this.lasttime = now
    }
  },
  addViews(view) {
    map.add(view)
  },
  removeViews(view) {
    map.remove(view)
  },
  clearMap() {
    marks.clearMassMarks()
    map.clearMap()
  },
  setFitView(views) {
    if (views) {
      map.setFitView(views)
    } else {
      map.setFitView()
    }
  },
  setFitSector({ p, r }) {
    this.setCenter(p)
    const z = distanceToZoom(r)
    map.setZoom(z)
  },
  setBound(lnglats_GD) {
    const { sw, ne } = getBound(lnglats_GD)
    if (!sw || !ne) {
      return
    }
    var mybounds = new AMap.Bounds(sw, ne) // sw, ne > [xxx,xxx], [xxx,xxx]
    map.setBounds(mybounds)
  },
}