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<template>
  <div class="ResClsTreeSelect">
    <el-select
      v-model="selectValue"
      :size="size"
      :disabled="disabled"
      clearable
      multiple
      popper-class="combobox-tree"
      :placeholder="selectValue.length > 0 ? '':item.placeholder"
      @remove-tag="onRemoveTag"
      @clear="onClear"
    >
      <el-option value="" style="min-width:200px">
        <el-tree
          ref="tree"
          :data="treeData"
          show-checkbox
          :node-key="nodeKey"
          :render-content="nodeContentRender"
          :check-strictly="true"
          @check="onCheckedNodes"
        />
      </el-option>
    </el-select>
  </div>
</template>

<script>
import { get, post } from '@/utils/http'
import _get from 'lodash.get'

export default {
  name: 'ResClsTreeSelect',
  componentName: '物料分类选择器',
  layoutConfigData: [
    {
      title: '高级组件配置',
      data: [
        {
          key: 'placeholder',
          title: '输入框占位文本',
          disabled: true,
          component: {
            defaultValue: '',
            name: 'el-input'
          }
        },
        {
          key: 'valueKey',
          title: '绑定对象的关联属性',
          disabled: true,
          component: {
            defaultValue: 'id',
            name: 'el-input'
          }
        },
        {
          key: 'multiple',
          title: '是否多选',
          disabled: true,
          component: {
            defaultValue: false,
            name: 'el-checkbox'
          }
        }
      ]
    }
  ],
  props: {
    value: {
      type: [Object, Array],
      default: null
    },
    nodeKey: {
      type: String,
      default: 'id'
    },
    parentKey: {
      type: String,
      default: 'parentId'
    },
    nodeName: {
      type: String,
      default: 'clsName'
    },
    multiple: {
      type: Boolean,
      default: false
    },
    clearable: {
      type: Boolean,
      default: true
    },
    showPath: {
      type: Boolean,
      default: () => true
    },
    disabled: {
      type: Boolean,
      default: () => false
    },
    size: {
      type: String,
      default: () => 'small'
    },
    form: {
      type: Object,
      default: () => {}
    },
    // 高阶组件配置的数据
    item: {
      type: Object,
      default: null
    }
  },
  data() {
    return {
      treeData: [],
      checkedNodes: [],
      // selectValue 必须是一个数字才能在 el-select 输入框中展示为一个tag
      selectValue: [],
      historyItems: []
    }
  },
  computed: {
    isMultiple() {
      return _get(this.item, 'multiple', false) || this.multiple
    },
    configParentIdParam() {
      return this.form.parentId
    }
  },
  mounted() {
    this.getTreeData()
  },
  methods: {
    getTreeData() {
      if (this.configParentIdParam) {
        this.getTreeDataByParentRes()
      } else {
        this.getNormalTreeData()
      }
    },
    getTreeDataByParentRes() {
      // this.configParentIdParam
      post(`/DxStOrgUnitResClassLink/getParentResClass?parentId=${this.configParentIdParam}`).then(res => {
        this.handleTreeDataRes(res)
      })
    },
    getNormalTreeData() {
      get('/DxResourceClasscification/tree')
        .then(res => {
          this.handleTreeDataRes(res)
        })
    },
    handleTreeDataRes(res) {
      this.treeData = res.items || []
      // 节点初始化回显
      this.historyItems = [];
      (this.value || []).forEach(m => m && this.historyItems.push(m))
      this.$nextTick(() => this.echoData(this.value))
    },
    // 回显数据
    echoData(value) {
      if (!Array.isArray(value)) return
      const ids = []
      value.forEach(m => {
        const id = _get(m, 'target.id', '')
        id && ids.push(id)
      })
      if (ids.length > 0) {
        this.$refs['tree'].setCheckedKeys(ids)
        this.$nextTick(() => this.getNodePath())
      }
    },
    // 获取选中节点的路径
    getNodePath() {
      const selectDataGroup = []
      const tree = this.$refs['tree']
      // 获取选中节点
      const nodesData = tree.getCheckedNodes()
      nodesData.forEach(nodeData => {
        selectDataGroup.push(tree.getNodePath(nodeData))
      })
      this.selectValue = selectDataGroup.map(m => {
        return m.map(n => n.clsName).join('/')
      })
      return selectDataGroup
    },
    onRemoveTag(label) {
      const selectDataGroup = []
      const tree = this.$refs['tree']
      // 获取选中节点
      const nodesData = tree.getCheckedNodes()
      nodesData.forEach(nodeData => {
        selectDataGroup.push(tree.getNodePath(nodeData))
      })
      const selectValue = selectDataGroup.map(m => {
        return m.map(n => n.clsName).join('/')
      })
      const idx = selectValue.findIndex(name => name === label)
      const items = selectDataGroup[idx]
      tree.setChecked(items[items.length - 1], false)
      this.$nextTick(() => {
        this.output(tree.getCheckedNodes())
      })
    },
    onClear() {
      this.$refs['tree'].setCheckedKeys([])
      this.selectValue = []
      this.checkedNodes = []
      this.output([])
    },
    // 节点渲染函数
    nodeContentRender(h, { node, data, store }) {
      return h('span', null, [`${data.clsName || ''}(${data.clsCode})`])
    },
    onCheckedNodes(data, { checkedNodes }) {
      this.$refs['tree'].getCheckedNodes()
      if (!this.isMultiple) {
        const tree = this.$refs['tree']
        checkedNodes.forEach(n => {
          if (n.id !== data.id) {
            tree.setChecked(n, false)
          }
        })
      }
      this.$nextTick(() => {
        this.getNodePath()
        this.output(checkedNodes)
      })
    },
    output(values) {
      values = this.updateLinkOperator(values)
      this.$emit('input', values)
    },
    // 更新link操作符
    updateLinkOperator(selectedItems = []) {
      const historyItemIds = []
      this.historyItems.map(m => {
        if (m.target) {
          historyItemIds.push(m.target.id)
        }
      })
      const selectedItemIds = selectedItems.map(m => m.id)
      // 历史中有的而新集合中没有,则新集合里没有的标识为 REMOVE
      const removeItems = this.historyItems
        .filter(m => !selectedItemIds.includes(m.target.id))
        .map(m => {
          return {
            ...m,
            operator: 'REMOVE'
          }
        })
      // 历史中有的而新集合中也有,则表示没有变更的,标识为 NO_CHANGE
      const noChangeItems = this.historyItems
        .filter(m => selectedItemIds.includes(m.target.id))
        .map(m => {
          return {
            ...m,
            operator: 'NO_CHANGE'
          }
        })
      // 历史中没有而新集合中有的,则表示新增的,标识为 ADD
      const newItems = selectedItems
        .filter(m => !historyItemIds.includes(m.id))
        .map(m => {
          return {
            target: m,
            operator: 'ADD'
          }
        })
      return removeItems.concat(noChangeItems, newItems)
    }
  }
}
</script>

<style lang="scss">
.ResClsTreeSelect {
  .el-tree > .el-tree-node {
      padding: 7px 0;
  }
  .el-scrollbar__view,
  .el-select-dropdown__item {
    padding: 0;
  }
  .el-select-dropdown__item{
    height: auto;
  }
}
</style>