class WmsLayerList {
  constructor () {
    // {图层名称：[{typeName:xxx,filter:yyy}]}
    this.layers = []
  }

  addConfig (config) {
    const typeName = config.typeName
    const layerGroup = config.layerGroup || typeName
    const filter = config.filter
    if (layerGroup) {
      this.addLayer(layerGroup, typeName, filter)
    }
  }

  addLayer (layerGroup, typeName, filter) {
    const layers = this.layers
    const layer = layers[layerGroup]
    if (layer) {
      layers[layerGroup].push({ typeName: typeName, filter: filter || 'INCLUDE' })
    } else {
      layers[layerGroup] = [{ typeName: typeName, filter: filter || 'INCLUDE' }]
    }
  }

  remove (typeName, filter) {
    const layers = this.layers
    for (const k in layers) {
      if (k === typeName) {
        delete this.layers[k]
        break
      }
      for (let i = 0; i < layers[k].length; i++) {
        const layer = layers[k][i]
        if (typeName === layer.typeName && filter === layer.filter) {
          this.layers[k].splice(i, 1)
          if (this.layers[k].length === 0) {
            delete this.layers[k]
          }
          break
        }
      }
    }
  }

  getLayers () {
    const layers = this.layers
    const _layers = []
    for (const k in layers) {
      _layers.push(k)
    }
    return _layers.join(',')
  }

  getFilters () {
    const layers = this.layers
    const cqlFilters = []
    for (const k in layers) {
      const filters = []
      for (let i = 0; i < layers[k].length; i++) {
        filters.push(layers[k][i].filter)
      }
      cqlFilters.push(filters.join(' OR '))
    }
    return cqlFilters.join(';')
  }
}

export default WmsLayerList