import WfsLayerService from './WfsLayerService'
import BusiLayerService from './BusiLayerService'
import WmsLayerService from './WmsLayerService'

class LayerFactory {
  constructor (options) {
    this.L = options.L
    this.map = window.map
    this.layers = {}
  }

  init (layerConfig) {
    // 1. 遍历layer config
    if (layerConfig) {
      for (var i = 0, l = layerConfig.length; i < l; i++) {
        var config = layerConfig[i]
        var layers = config.layers
        var childLayer = config.childLayer
        layers && this.init(config.layers)
        childLayer && this.init(config.childLayer)

        var checked = config.checked
        checked && this.load(config)
      }
    }
  }

  /**
   * 控制显示的级别
   * @param layerConfig
   */
  initEvent (layerConfig) {
    this.map.on('zoomend ', (e) => this.toggleByZoom(layerConfig))
  }

  toggleByZoom (layerConfig) {
    const zoom = this.map.getZoom()
    if (layerConfig) {
      for (var i = 0, l = layerConfig.length; i < l; i++) {
        var config = layerConfig[i]
        var layers = config.layers
        var checked = config.checked
        var childLayer = config.childLayer
        layers && this.toggleByZoom(layers)
        childLayer && this.toggleByZoom(childLayer)
        if (checked && config.minZoom) {
          if (zoom > config.minZoom) {
            this.show(config)
          } else {
            console.log(config.name)
            this.hide(config)
          }
        }
      }
    }
  }

  load (config) {
    var code = config.code
    var wfs = config.wfs
    var wms = config.wms
    var url = config.url
    // 判断是否已经加载过，加载过就 直接得到对象调用 显示函数
    var layer = this.layers[code]
    if (!layer) {
      layer = this.L.featureGroup({}).addTo(this.map)
      // 2. 判断类型
      if (wfs) {
        // 3. 实例化具体service
        var wfsLayerService = new WfsLayerService(config)
        wfsLayerService.init(layer)
        this.setZIndex(layer)
      }
      if (wms) {
        var wmsLayerService = new WmsLayerService(config)
        wmsLayerService.init(layer)
      }
      // 请求业务数据接口
      if (url) {
        var busiLayerService = new BusiLayerService(config)
        busiLayerService.init(layer)
      }
      layer ? (this.layers[code] = layer) : console.log('LayerFactory：newLayer is null，please check !!!')
    } else {
      this.show(code)
    }
  }

  show (config) {
    var layer = this.layers[config.code]
    if (layer) {
      layer.addTo(this.map)
      this.setZIndex(layer)
    } else {
      this.load(config)
    }
  }

  hide (config) {
    var layer = this.layers[config.code]
    layer && this.map.removeLayer(layer)
  }

  toggle (code) {

  }

  /**
   * todo 这里无效，貌似是因为geojson加载到地图也是个layergroup
   *
   * 设置index,线在最下面，点在上面
   * @param layerGroup 图层组
   */
  setZIndex (layer) {
    if (Array.isArray(layer)) {
      for (var i = 0; i < layer.length; i++) {
        this.setZIndex(layer[i])
      }
    } else {
      if (layer.getLayers) {
        this.setZIndex(layer.getLayers())
      } else {
        if (layer.feature && (layer.feature.geometry.type === 'LineString' || layer.feature.geometry.type === 'MultiLineString')) {
          layer.bringToBack && layer.bringToBack()
        } else {
          layer.bringToFront && layer.bringToFront()
        }
      }
    }
  }
}

export default LayerFactory