text: import T from 'ant-design-vue/es/table/Table'
  import get from 'lodash.get'
  
  export default {
    data () {
      return {
        needTotalList: [],
  
        selectedRows: [],
        selectedRowKeys: [],
  
        localLoading: false,
        localDataSource: [],
        localPagination: Object.assign({}, this.pagination)
      }
    },
    props: Object.assign({}, T.props, {
      rowKey: {
        type: [String, Function],
        default: 'key'
      },
      data: {
        type: Function,
        required: true
      },
      pageNum: {
        type: Number,
        default: 1
      },
      pageSize: {
        type: Number,
        default: 10
      },
      showSizeChanger: {
        type: Boolean,
        default: true
      },
      size: {
        type: String,
        default: 'default'
      },
      alert: {
        type: [Object, Boolean],
        default: null
      },
      rowSelection: {
        type: Object,
        default: null
      },
      /** @Deprecated */
      showAlertInfo: {
        type: Boolean,
        default: false
      },
      showPagination: {
        type: String | Boolean,
        default: 'auto'
      },
      /**
       * enable page URI mode
       *
       * e.g:
       * /users/1
       * /users/2
       * /users/3?queryParam=test
       * ...
       */
      pageURI: {
        type: Boolean,
        default: false
      }
    }),
    watch: {
      'localPagination.current' (val) {
        this.pageURI && this.$router.push({
          ...this.$route,
          name: this.$route.name,
          params: Object.assign({}, this.$route.params, {
            pageNo: val
          })
        })
      },
      pageNum (val) {
        Object.assign(this.localPagination, {
          current: val
        })
      },
      pageSize (val) {
        Object.assign(this.localPagination, {
          pageSize: val
        })
      },
      showSizeChanger (val) {
        Object.assign(this.localPagination, {
          showSizeChanger: val
        })
      },
      '$route.path': function (newPath, oldPath) {
        if (oldPath.indexOf(newPath) === -1) {
          this.refresh(true)
        }
      }
    },
    created () {
      const { pageNo } = this.$route.params
      const localPageNum = this.pageURI && (pageNo && parseInt(pageNo)) || this.pageNum
      this.localPagination = ['auto', true].includes(this.showPagination) && Object.assign({}, this.localPagination, {
        current: localPageNum,
        pageSize: this.pageSize,
        showSizeChanger: this.showSizeChanger
      }) || false
      console.log('this.localPagination', this.localPagination)
      this.needTotalList = this.initTotalList(this.columns)
      this.loadData()
    },
    methods: {
      /**
       * 表格重新加载方法
       * 如果参数为 true, 则强制刷新到第一页
       * @param Boolean bool
       */
      refresh (bool = false) {
        bool && (this.localPagination = Object.assign({}, {
          current: 1, pageSize: this.pageSize
        }))
        this.loadData()
      },
      /**
       * 加载数据方法
       * @param {Object} pagination 分页选项器
       * @param {Object} filters 过滤条件
       * @param {Object} sorter 排序条件
       */
      loadData (pagination, filters, sorter) {
        this.localLoading = true
        const parameter = Object.assign({
          pageNo: (pagination && pagination.current) ||
            this.showPagination && this.localPagination.current || this.pageNum,
          pageSize: (pagination && pagination.pageSize) ||
            this.showPagination && this.localPagination.pageSize || this.pageSize
        },
        (sorter && sorter.field && {
          sortField: sorter.field
        }) || {},
        (sorter && sorter.order && {
          sortOrder: sorter.order
        }) || {}, {
          ...filters
        }
        )
        const result = this.data(parameter)
        // 对接自己的通用数据接口需要修改下方代码中的 r.pageNo, r.totalCount, r.data
        // eslint-disable-next-line
        if ((typeof result === 'object' || typeof result === 'function') && typeof result.then === 'function') {
          result.then(r => {
            this.localPagination = this.showPagination && Object.assign({}, this.localPagination, {
              current: r.pageNo, // 返回结果中的当前分页数
              total: r.totalCount, // 返回结果中的总记录数
              showSizeChanger: this.showSizeChanger,
              pageSize: (pagination && pagination.pageSize) ||
                this.localPagination.pageSize
            }) || false
            // 为防止删除数据后导致页面当前页面数据长度为 0 ,自动翻页到上一页
            if (r.data.length === 0 && this.showPagination && this.localPagination.current > 1) {
              this.localPagination.current--
              this.loadData()
              return
            }
  
            // 这里用于判断接口是否有返回 r.totalCount 且 this.showPagination = true 且 pageNo 和 pageSize 存在 且 totalCount 小于等于 pageNo * pageSize 的大小
            // 当情况满足时，表示数据不满足分页大小，关闭 table 分页功能
            try {
              if ((['auto', true].includes(this.showPagination) && r.totalCount <= (r.pageNo * this.localPagination.pageSize))) {
                this.localPagination.hideOnSinglePage = false
              }
            } catch (e) {
              this.localPagination = false
            }
            this.localDataSource = r.data // 返回结果中的数组数据
            this.localLoading = false
          })
        }
      },
      initTotalList (columns) {
        const totalList = []
        columns && columns instanceof Array && columns.forEach(column => {
          if (column.needTotal) {
            totalList.push({
              ...column,
              total: 0
            })
          }
        })
        return totalList
      },
      /**
       * 用于更新已选中的列表数据 total 统计
       * @param selectedRowKeys
       * @param selectedRows
       */
      updateSelect (selectedRowKeys, selectedRows) {
        this.selectedRows = selectedRows
        this.selectedRowKeys = selectedRowKeys
        const list = this.needTotalList
        this.needTotalList = list.map(item => {
          return {
            ...item,
            total: selectedRows.reduce((sum, val) => {
              const total = sum + parseInt(get(val, item.dataIndex))
              return isNaN(total) ? 0 : total
            }, 0)
          }
        })
      },
      /**
       * 清空 table 已选中项
       */
      clearSelected () {
        if (this.rowSelection) {
          this.rowSelection.onChange([], [])
          this.updateSelect([], [])
        }
      },
      /**
       * 处理交给 table 使用者去处理 clear 事件时，内部选中统计同时调用
       * @param callback
       * @returns {*}
       */
      renderClear (callback) {
        if (this.selectedRowKeys.length <= 0) return null
        return (
          <a style="margin-left: 24px" onClick={() => {
            callback()
            this.clearSelected()
          }}>清空</a>
        )
      },
      renderAlert () {
        // 绘制统计列数据
        const needTotalItems = this.needTotalList.map((item) => {
          return (<span style="margin-right: 12px">
            {item.title}总计 <a style="font-weight: 600">{!item.customRender ? item.total : item.customRender(item.total)}</a>
          </span>)
        })
  
        // 绘制 清空 按钮
        const clearItem = (typeof this.alert.clear === 'boolean' && this.alert.clear) ? (
          this.renderClear(this.clearSelected)
        ) : (this.alert !== null && typeof this.alert.clear === 'function') ? (
          this.renderClear(this.alert.clear)
        ) : null
  
        // 绘制 alert 组件
        return (
          <a-alert showIcon={true} style="margin-bottom: 16px">
            <template slot="message">
              <span style="margin-right: 12px">已选择: <a style="font-weight: 600">{this.selectedRows.length}</a></span>
              {needTotalItems}
              {clearItem}
            </template>
          </a-alert>
        )
      }
    },
  
    render () {
      const props = {}
      const localKeys = Object.keys(this.$data)
      const showAlert = (typeof this.alert === 'object' && this.alert !== null && this.alert.show) && typeof this.rowSelection.selectedRowKeys !== 'undefined' || this.alert
  
      Object.keys(T.props).forEach(k => {
        const localKey = `local${k.substring(0, 1).toUpperCase()}${k.substring(1)}`
        if (localKeys.includes(localKey)) {
          props[k] = this[localKey]
          return props[k]
        }
  
        if (k === 'rowSelection') {
          if (showAlert && this.rowSelection) {
            // 如果需要使用alert，则重新绑定 rowSelection 事件
            props[k] = {
              ...this.rowSelection,
              selectedRows: this.selectedRows,
              selectedRowKeys: this.selectedRowKeys,
              onChange: (selectedRowKeys, selectedRows) => {
                this.updateSelect(selectedRowKeys, selectedRows)
                typeof this[k].onChange !== 'undefined' && this[k].onChange(selectedRowKeys, selectedRows)
              }
            }
            return props[k]
          } else if (!this.rowSelection) {
            // 如果没打算开启 rowSelection 则清空默认的选择项
            props[k] = null
            return props[k]
          }
        }
        this[k] && (props[k] = this[k])
        return props[k]
      })
  
      console.log('re-render table', new Date())
      const table = (
        <a-table {...{ props, scopedSlots: { ...this.$scopedSlots } }} onChange={this.loadData}>
          { Object.keys(this.$slots).map(name => (<template slot={name}>{this.$slots[name]}</template>)) }
        </a-table>
      )
  
      return (
        <div class="table-wrapper">
          { showAlert ? this.renderAlert() : null }
          { table }
        </div>
      )
    }
  }
  