// 传入你要获取的参数的名字
function getParam (name) {
  var reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)', 'i');
  var r = window.location.search.substr(1).match(reg); //获取url中'?'符后的字符串并正则匹配

  var context = '';
  if (r != null) context = r[2];
  // 释放变量
  reg = null;
  r = null;
  return context == null || context == '' || context == 'undefined' ? '' : context;
}
 // 需要结合area-three-sidebar-template.js使用
function getRandomString (len) {
  let randomString = ''
  if (len) {
    var $chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'
    var maxPos = $chars.length
    for (let i = 0; i < len; i++) {
      randomString += $chars.charAt(Math.floor(Math.random() * maxPos))
    }
  } else {
    randomString = Math.random().toString(36).substring(2)
  }
  return randomString
}

var AreaThreeSidebarTemplate = `
     <sidebar-selector-ui
        ref="firstSidebar"
        class="area-city-sidebar-selector first-sidebar"
        :height="height"
        :class="{
          'disabled-city': disabledCitySelect,
          'province-city-split': useProvinceCitySplit
        }"
        :whenParentLevel0Selected="whenParentLevel0Selected"
        :sourceList="provinceList"
        :childrenAddText="childrenAddText"
        @onChange="onChangeFirst"
        :beforeChildChange="beforeChildChange"
        :showParentWhenChildrenEmpty="false"
        :lazyRender="false">
        <template #tab-tag="{ parent }">
          <slot name="tab-tag" :parent="parent">
            <van-tag
              round
              type="primary"
              v-if="parent.value && sourceFirstCount[parent.value] && sourceFirstCount[parent.value]._children_selectedCount"
              :class="{ visible: sourceFirstCount[parent.value]._children_selectedCount === 0 }">
              {{sourceFirstCount[parent.value]._children_selectedCount }}
            </van-tag>
          </slot>
        </template>
        <template #tab-content="{ parent }">
          <!-- 嵌套的 side-bar 组件 -->
          <Sidebar-selector-ui
            :ref="'secondSidebar_' + parent.id || ''"
            class="area-city-sidebar-selector second-sidebar"
            :class="{
                'disabled-city': disabledCitySelect,
                'province-city-split': useProvinceCitySplit
              }"
            :height="height"
            :childrenAddText="childrenAddText"
            :source-list="parent.children"
            @onChange="onChange($event, parent.value)"
            :beforeChildChange="beforeChildChange"
           :showParentWhenChildrenEmpty="false">
            <template #tab-item="{ parent }">
              <div class="title-name" v-show="!isGAT(parent.name)">{{ parent.name }}</div>
              <div class="title-text" v-show="!isGAT(parent.name)">
                <slot name="tab-tag" :parent="parent">
                  <van-tag
                    round
                    type="primary"
                    v-if="tagTextOnlySelectedCount && parent._children_selectedCount">
                    {{ parent._children_selectedCount }}
                  </van-tag>
                </slot>
              </div>
            </template>
            <template #default="{ parent, child }">
              <slot name="default" v-bind="{ parent, child }">
                <template v-if="parent.level !== 0 && child.level === 0 && useProvinceCitySplit">
                  <van-cell is-link :border="false">
                    {{child.name}}
                    <template #right-icon>
                      <span class="j-icon checkbox" :class="{ checked: child._selected }"></span>
                    </template>
                  </van-cell>
                  <div class="children-title border-line-b" @click.stop>
                    <div class="c-title-text">市级</div>
                    <van-tag v-if="disabledCitySelect" round plain type="danger" @click="disabledCityClick">开通</van-tag>
                  </div>
                </template>
              </slot>
            </template>
          </Sidebar-selector-ui>
        </template>
      </sidebar-selector-ui>`



var areaThreeSidebarComponent = {
  name: 'area-three-sidebar-template',
  template: AreaThreeSidebarTemplate,
  components: {
    SidebarSelectorUi: SidebarSelectorUi
  },
  props: {
    height: {
      type: String,
      default: ''
    },
    value: {
      type: Object,
      default () {
        return {}
      }
    },
    /**
     * 省份城市布局分割
     */
    useProvinceCitySplit: {
      type: Boolean,
      default: false
    },
    /**
     * 城市选择禁用
     */
    disabledCitySelect: {
      type: Boolean,
      default: false
    },
    /**
     * 数据统计tag显示
     */
    tagTextOnlySelectedCount: {
      type: Boolean,
      default: false
    },
    /**
     * 二级子项 "全部" 文字的替换
     */
    childrenAddText: String,
    /**
     * 更改确认函数
     *
     * 如果传入该函数，点击二级子项会触发，返回true会确认成功，返回false则会阻止更改
     */
    beforeChange: Function,
    /**
     * 是否可全不选中
     */
    canEmptySelected: {
      type: Boolean,
      default: false
    }
  },
  model: {
    prop: 'value',
    event: 'modelChange'
  },
  watch: {
    value: {
      handler(newVal) {
        this.setState(newVal)
      },
      deep: true
    }
  },
  data () {
    return {
      // 原始数组
      provinceListMapExp: {
        '#': ['全国'],
        A: ['安徽', '澳门'],
        B: ['北京'],
        C: ['重庆'],
        F: ['福建'],
        G: ['广东', '广西', '贵州', '甘肃'],
        H: ['河北', '湖北', '黑龙江', '海南', '河南', '湖南'],
        J: ['吉林', '江苏', '江西'],
        L: ['辽宁'],
        N: ['内蒙古', '宁夏'],
        Q: ['青海'],
        S: ['山西', '陕西', '上海', '山东', '四川'],
        T: ['天津', '台湾'],
        X: ['西藏', '新疆', '香港'],
        Y: ['云南'],
        Z: ['浙江']
      },
      whenParentLevel0Selected: false,
      // 原始城市数据
      // chinaMapJSON,
      provinceListMap: {
        // A: [
        //     {
        //         name: '安徽',
        //         expanded: false,
        //         canExpanded: true,
        //         selectedState: '',
        //         children: []
        //     }
        // ]
      },
      provinceList: [],
      // indexBar数据
      indexList: [],
      provinceExp: {
        name: '安徽',
        value: '',
        // 展开状态
        expanded: false,
        // 是否可以展开
        canExpanded: false,
        children: []
      },
      sourceFirstCount: {},
      // 全国二级菜单名
      allCountryRefName: null,
      // 二级菜单ref名
      secondRefNameObj: {}
    }
  },
  created () {
    this.init(this.provinceListMapExp)
  },
  mounted () {
    var defaultVal = this.canEmptySelected ? -1 : {}
    this.setState(defaultVal)
    this.setActiveTab(1)
  },
  methods: {
    setActiveTab (num) {
      var { firstSidebar } = this.$refs
      firstSidebar.setActiveTab(num)
    },
    // 整理城市数据列表(并初始化indexBar数据)
    init (provinceListMapExp) {
      // 整理数据得到List，同时获得indexList
      var provinceListMap = {}
      var indexList = []
      this.secondRefNameObj = {}
      this.allCountryRefName = null
      for (var key in provinceListMapExp) {
        var areaArr = []
        indexList.push(key)
        provinceListMapExp[key].forEach(pName => {
          var provinceExp = JSON.parse(JSON.stringify(this.provinceExp))
          provinceExp.name = pName
          provinceExp.id = `ap-${getRandomString(8).toLowerCase()}`
          // 记录下二级ref
          this.$set(this.secondRefNameObj, pName,  'secondSidebar_' + provinceExp.id)
          if(pName === '全国') {
            this.allCountryRefName = 'secondSidebar_' + provinceExp.id
          }
          if (pName !== '全国') {
            var cities = this.getCitiesFromJSONMap(pName)
            // 筛选掉直辖市和特别行政区(台湾省也不不需要展开)
            if (cities.ProRemark === '省份' || cities.ProRemark === '自治区') {
              if (cities.ProID === 32) {
                provinceExp.children = []
                provinceExp.canExpanded = false
              } else {
                cities.city.forEach(c => {
                  // 将区县数据取出，处理成新数组，放入城市
                  let districtChildren = []
                  if(c.area && c.area.length > 0) {
                    districtChildren =  c.area.map(dItem => {
                      return {
                        district: dItem,
                        selected: false,
                        canSelected: true,
                        id: `adi-${getRandomString(8).toLowerCase()}`
                      }
                    })
                  }
                  // 将市区重组成一个新的对象
                  provinceExp.children.push({
                    city: c.name,
                    selected: false,
                    canSelected: true,
                    id: `ac-${getRandomString(8).toLowerCase()}`,
                    children: districtChildren// 区县
                  })
                })
              }
            } else if (cities.ProRemark === '直辖市') {
              // 直辖市，将区县放置到第二级
              if(cities.city && Array.isArray(cities?.city)) {
                var orgDistrict = cities?.city[0].area || []
                // 将区县数据取出，处理成新数组，放入城市
                let districtChildren = orgDistrict.map(dItem => {
                  return {
                    district: dItem,
                    selected: false,
                    canSelected: true,
                    id: `adi-${getRandomString(8).toLowerCase()}`
                  }
                })
                provinceExp.children.push({
                  city: provinceExp.name?.indexOf('市') > -1 ? provinceExp.name : provinceExp.name + '市',
                  selected: false,
                  canSelected: true,
                  id: `ac-${getRandomString(8).toLowerCase()}`,
                  children: districtChildren
                })
              }
            } else {
              provinceExp.children = []
              provinceExp.canExpanded = false
            }
          }

          provinceExp.canExpanded = provinceExp.children.length !== 0
          areaArr.push(provinceExp)
        })
        provinceListMap[key] = areaArr
      }
      this.provinceListMap = provinceListMap
      this.indexList = indexList.filter(i => i !== '#')
      // 给provinceListMap赋值
      for (var k in provinceListMap) {
        this.$set(this.provinceListMap, k, provinceListMap[k])
      }
      this.initProvinceList(provinceListMap)
    },
    // 循环chinaMapJSON，找到对应省下面对应的市
    getCitiesFromJSONMap (provinceName) {
      let temp = null
      for (let i = 0; i < chinaMapJSON.length; i++) {
        var findThis = chinaMapJSON[i].name.indexOf(provinceName) !== -1
        // 如果找到了，就不再循环后面的了
        if (findThis) {
          temp = chinaMapJSON[i]
          break
        }
      }
      return temp
    },
    initProvinceList (provinceListMap) {
      var provinceList = []
      for (var key in provinceListMap) {
        var provinces = provinceListMap[key]
        provinces.forEach(province => {
          if (province.name === '全国') {
            province.level = 0
          } else {
            province.level = 1
          }
          var cities = []
          if (Array.isArray(province.children)) {
            province.children.forEach(city => {
              // 将区县数据取出，处理成新数组，放入城市
              let districtChildren = []
              if(Array.isArray(city.children)) {
                districtChildren =  city.children.map(dItem => {
                  return {
                    topName: province.name,
                    parentName: city.city,
                    name: dItem.district,
                    value: dItem.district,
                    id: dItem.id,
                    level: 3
                  }
                })
              }
              cities.push({
                id: city.id,
                name: city.city,
                value: city.city,
                level: 2,
                parentName: province.name,
                sourceChildrenCount: districtChildren.length, // 子集真实数量
                children: districtChildren  // 区县
              })
            })
          }

          provinceList.push({
            id: province.id,
            name: province.name,
            value: province.name,
            level: province.level,
            sourceChildrenCount: cities.length, // 子集真实数量
            children: cities,
            hasThree: true
          })
        })
      }
      this.provinceList = provinceList
    },
    disabledCityClick () {
      this.$emit('on-disabled-city-click')
    },
    beforeChildChange (parent, child) {
      if (this.beforeChange) {
        return this.beforeChange(parent, child)
      }
      // 已选的省份列表
      const selectedProvinceList = []
      for(var key in this.sourceFirstCount) {
        selectedProvinceList.push(key)
      }
      if (this.disabledCitySelect) {
        if(parent.parentName && selectedProvinceList.indexOf(parent.parentName) > -1) {
          return true
        } else {
          this.disabledCityClick()
          return false
        }
      } else {
        return true
      }
    },
    getState () {
      var { state } = this.getStateMore()
      return state
    },
    /**
     * 最后输出数据结构
     * 参数area示例
     * {
     *    澳门: {}
     *    北京: {
     *      北京: ['朝阳区']
     *    },
     *    河南: {
     *      南阳市: [],
     *      郑州: ['金水区'],
     *      洛阳市: ['栾川县','老城区']
     *    }
     * }
     */
    getStateMore () {
      // 选中状态
      var state = {}
      // 选中数量统计
      var stateCounter = {}
      // 是否选了全国
      var isSelectedCountry = false
      // 所有二级市区遍历
      for(let refKey in this.secondRefNameObj) {
        var refName = this.secondRefNameObj[refKey]
        var renderList = this.$refs[refName]?.renderList || []

        for (let i = 0; i < renderList.length; i++) {
          var parent = renderList[i]
          var children = parent.children
          var provinceName = parent.parentName
          // 全国选中
          if (parent.level === 0 && provinceName === '全国') {
            if (children && children[0]._selected) {
              isSelectedCountry = true
              break
            }
            continue
          }
          // 当前省份下，全部选中(保存当前省份)
          if(parent.level === 0 && provinceName !== '全国') {
            // 市区【全部】和区县【全部】都选中
            if (parent._selected) {
              state[provinceName] = {}
              break
            }
            continue
          }
          // 当前市全选中(【市区】和【全部】选中)
          if(parent.level === 2 && parent._selected) {
            if(!state[provinceName]) {
              state[provinceName] = {}
            }
            this.$set(state[provinceName], parent.name, [])
            continue
          }
          // 区县选择
          if (Array.isArray(children)) {
            var childSelected = []
            for (let j = 0; j < children.length; j++) {
              var child = children[j]
              if (child.level === 0) {
                continue
              } else {
                if (child._selected) {
                  childSelected.push(child.value)
                }
              }
            }

            if (childSelected.length > 0) {
              if(!state[provinceName]) {
                state[provinceName] = {}
              }
              if(!state[provinceName][parent.name]) {
                this.$set(state[provinceName], parent.name, [])
              }
              state[provinceName][parent.name] = childSelected
            }
          }
        }
      }
      var resultState = state
      if(Object.keys(state).length === 0 && !isSelectedCountry && this.canEmptySelected) {
        resultState = -1
      }
      return {
        state: resultState,
        stateCounter
      }
    },
    /**
     * 设置组件状态
     * getState中获取的数据能够直接传入进行状态恢复
     * 全部不选中传入-1
     */
    setState (state) {
      // 所有都不选中
      if (state === -1) {
        this.resetSelect(false)
        this.$emit('modelChange', -1)
        return
      }
      var firstSidebar = this.$refs.firstSidebar
      firstSidebar.setAllState(false)
      firstSidebar.refreshAllChildrenState(false)
      // 重置第二级，并且选中全国
      this.resetSelect()
      if (typeof state === 'object' && Object.keys(state).length > 0) {
        this.setSidebarState(state)
        this.$refs[this.allCountryRefName]?.setParentLevel0State(false)
      }
      // 重新计算parent数据统计
      firstSidebar.refreshAllChildrenState()
      this.$emit('modelChange', state || {})
    },
    setSidebarState (state) {
      for(var proName in state) {
        var refName = this.secondRefNameObj[proName]
        var refItem = this.$refs[refName]
        if(!refItem) {
          return
        }
        // 选择了全省
        var stateProvince = state[proName]
        // 第一级省份下选中的市区数量
        let _children_selectedCount = 0
        refItem.setState(renderList => {
          // 选择了全省
          if(stateProvince && Object.keys(stateProvince).length === 0) {
            refItem.setAllState(true)
            refItem.refreshAllChildrenState(true)
            // 更新第一级 side-bar 的状态
            _children_selectedCount = renderList.length - 1
          } else {
            renderList.forEach(parent => {
              // 当前市下选择的区域数组
              var stateDistrict = stateProvince[parent.name]
              if(stateDistrict) {
                if (Array.isArray(stateDistrict)) {
                  _children_selectedCount += 1
                  // 选择了全市
                  if (stateDistrict.length === 0) {
                    refItem.setChildrenState(parent.children, true)
                  } else {
                    // 选择了部分区域
                    parent.children.forEach(child => {
                      if (stateDistrict.includes(child.value)) {
                        child._selected = true
                      }
                    })
                  }
                }
                refItem.checkChildrenAllChecked(parent, parent.children)
              }
            })
          }
          // 更新第一级 side-bar 的状态
          this.$set(this.sourceFirstCount, proName, {
            _children_selectedCount: _children_selectedCount,
            _children_count: renderList.length - 1
          })
        })
        refItem.refreshAllChildrenState()
      }
    },
    // 重置所有选择
    resetSelect(selectedAll = true) {
      var { firstSidebar } = this.$refs
      firstSidebar.setAllState(false)
      firstSidebar.refreshAllChildrenState(false)
      firstSidebar.setParentLevel0State(selectedAll)
      var firstRenderList =  firstSidebar.renderList
      for(let item of firstRenderList) {
        var secondRef = this.$refs['secondSidebar_' + item.id]
        secondRef.setAllState(false)
        secondRef.refreshAllChildrenState(false)
        if(item.name === '全国'){
          secondRef.setParentLevel0State(selectedAll)
        }
      }
      this.sourceFirstCount = {}
    },
    // 处理第一级 side-bar 组件的变化事件
    onChangeFirst({ parent, child, renderList }) {
      if (parent.level === 0 && parent.name === '全国') {
        this.resetSelect()
      } else {
        this.$set(this.sourceFirstCount, parent.value, {
          _children_selectedCount: parent._children_selectedCount,
          _children_count: parent._children_count
        })
        this.$refs.firstSidebar.setParentLevel0State(false)
      }
    },
    // 处理第二级 side-bar 组件的变化事件
    onChange ({ parent, child, renderList }, value) {
      this.disposeSecondCount({ parent, child, renderList }, value)
      var stateValue = this.getState()
      var payload = { parent, child, value: stateValue }
      this.$emit('modelChange', payload.value)
      this.$emit('change', payload)
    },
    // 处理二级菜单选择
    disposeSecondCount ({ parent, child, renderList }, value) {
      if(parent.level === 0 && parent.parentName ==='全国'){
        this.resetSelect()
        return
      }
      // 将全国选择重置掉
      if(this.allCountryRefName) {
        this.$refs[this.allCountryRefName]?.setParentLevel0State(false)
      }
      var selectedNum = renderList?.filter(temp => temp._children_selectedCount > 0)?.length || 0
      var result = {
        _children_selectedCount: selectedNum,
        _children_count: renderList.length - 1
      }
      // 更新第一级 side-bar 的状态
      this.$set(this.sourceFirstCount, value, result)
      this.$refs.firstSidebar.setParentLevel0State(false)
    },
    // 是否是港澳台地区
    isGAT(val) {
      var GATList = ['香港', '澳门', '台湾']
      return val && GATList.indexOf(val) > -1
    }
  }
}