<template>
  <!-- 查询表单 -->
  <SearchForm
    v-show='isShowSearch'
    :search='_search'
    :reset='_reset'
    :columns='searchColumns'
    :search-param='searchParam'
    :search-col='searchCol'
  />

  <!-- 表格主体 -->
  <div class='card table-main'>
    <!-- 表格头部 操作按钮 -->
    <div class='table-header'>
      <div class='header-button-lf'>
        <slot name='tableHeader' :selected-list='selectedList' :selected-list-ids='selectedListIds'
              :is-selected='isSelected' />
      </div>
      <div v-if='toolButton' class='header-button-ri'>
        <slot name='toolButton'>
          <el-button v-if="showToolButton('refresh')" :icon='Refresh' circle @click='getTableList' />
          <el-button v-if="showToolButton('setting') && columns.length" :icon='Operation' circle
                     @click='openColSetting' />
          <el-button
            v-if="showToolButton('search') && searchColumns?.length"
            :icon='Search'
            circle
            @click='isShowSearch = !isShowSearch'
          />
        </slot>
      </div>
    </div>
    <!-- 表格主体 -->
    <el-table
      ref='tableRef'
      v-bind='$attrs'
      :id='uuid'
      :data='processTableData'
      :border='border'
      :row-key='rowKey'
      @selection-change='selectionChange'
    >
      <!-- 默认插槽 -->
      <slot />
      <template v-for='item in tableColumns' :key='item'>
        <!-- selection || radio || index || expand || sort -->
        <el-table-column
          v-if='item.type && columnTypes.includes(item.type)'
          v-bind='item'
          :align="item.align ?? 'center'"
          :reserve-selection="item.type == 'selection'"
        >
          <template #default='scope'>
            <!-- expand -->
            <template v-if="item.type == 'expand'">
              <component :is='item.render' v-bind='scope' v-if='item.render' />
              <slot v-else :name='item.type' v-bind='scope' />
            </template>
            <!-- radio -->
            <el-radio v-if="item.type == 'radio'" v-model='radio' :label='scope.row[rowKey]'>
              <i></i>
            </el-radio>
            <!-- sort -->
            <el-tag v-if="item.type == 'sort'" class='move'>
              <el-icon>
                <DCaret />
              </el-icon>
            </el-tag>
          </template>
        </el-table-column>
        <!-- other -->
        <TableColumn v-else :column='item'>
          <template v-for='slot in Object.keys($slots)' #[slot]='scope'>
            <slot :name='slot' v-bind='scope' />
          </template>
        </TableColumn>
      </template>
      <!-- 插入表格最后一行之后的插槽 -->
      <template #append>
        <slot name='append' />
      </template>
      <!-- 无数据 -->
      <template #empty>
        <div class='table-empty'>
          <slot name='empty'>
            <img src='@/assets/images/notData.png' alt='notData' />
            <div>暂无数据</div>
          </slot>
        </div>
      </template>
    </el-table>
    <!-- 分页组件 -->
    <slot name='pagination'>
      <Pagination
        v-if='pagination'
        :pageable='pageable'
        :handle-size-change='handleSizeChange'
        :handle-current-change='handleCurrentChange'
      />
    </slot>
  </div>
  <!-- 列设置 -->
  <ColSetting v-if='toolButton' ref='colRef' v-model:col-setting='colSetting' />
</template>

<script setup lang='ts' name='ProTable'>
import { ElTable } from 'element-plus'
import { useTable } from '@/hooks/useTable'
import { useSelection } from '@/hooks/useSelection'
import { BreakPoint } from '@/components/Grid/interface'
import { ColumnProps, TypeProps } from '@/components/ProTable/interface'
import { Refresh, Operation, Search } from '@element-plus/icons-vue'
import { generateUUID, handleProp } from '@/utils'
import SearchForm from '@/components/SearchForm/index.vue'
import Pagination from './components/Pagination.vue'
import ColSetting from './components/ColSetting.vue'
import TableColumn from './components/TableColumn.vue'
import Sortable from 'sortablejs'

export interface ProTableProps {
  columns: ColumnProps[]; // 列配置项  ==> 必传
  data?: any[]; // 静态 table data 数据，若存在则不会使用 requestApi 返回的 data ==> 非必传
  requestApi?: (params: any) => Promise<any>; // 请求表格数据的 api ==> 非必传
  requestAuto?: boolean; // 是否自动执行请求 api ==> 非必传（默认为true）
  requestError?: (params: any) => void; // 表格 api 请求错误监听 ==> 非必传
  dataCallback?: (data: any) => any; // 返回数据的回调函数，可以对数据进行处理 ==> 非必传
  title?: string; // 表格标题 ==> 非必传
  pagination?: boolean; // 是否需要分页组件 ==> 非必传（默认为true）
  initParam?: any; // 初始化请求参数 ==> 非必传（默认为{}）
  border?: boolean; // 是否带有纵向边框 ==> 非必传（默认为true）
  toolButton?: ('refresh' | 'setting' | 'search')[] | boolean; // 是否显示表格功能按钮 ==> 非必传（默认为true）
  rowKey?: string; // 行数据的 Key，用来优化 Table 的渲染，当表格数据多选时，所指定的 id ==> 非必传（默认为 id）
  searchCol?: number | Record<BreakPoint, number>; // 表格搜索项 每列占比配置 ==> 非必传 { xs: 1, sm: 2, md: 2, lg: 3, xl: 4 }
}

// 接受父组件参数，配置默认值
const props = withDefaults(defineProps<ProTableProps>(), {
  columns: () => [],
  requestAuto: true,
  pagination: true,
  initParam: {},
  border: true,
  toolButton: true,
  rowKey: 'id',
  searchCol: () => ({ xs: 1, sm: 2, md: 2, lg: 3, xl: 4 }),
})

// table 实例
const tableRef = ref<InstanceType<typeof ElTable>>()

// 生成组件唯一id
const uuid = ref('id-' + generateUUID())

// column 列类型
const columnTypes: TypeProps[] = ['selection', 'radio', 'index', 'expand', 'sort']

// 是否显示搜索模块
const isShowSearch = ref(true)

// 控制 ToolButton 显示
const showToolButton = (key: 'refresh' | 'setting' | 'search') => {
  return Array.isArray(props.toolButton) ? props.toolButton.includes(key) : props.toolButton
}

// 单选值
const radio = ref('')

// 表格多选 Hooks
const { selectionChange, selectedList, selectedListIds, isSelected } = useSelection(props.rowKey)

// 表格操作 Hooks
const {
  tableData,
  pageable,
  searchParam,
  searchInitParam,
  getTableList,
  search,
  reset,
  handleSizeChange,
  handleCurrentChange,
} =
  useTable(props.requestApi, props.initParam, props.pagination, props.dataCallback, props.requestError)

// 清空选中数据列表
const clearSelection = () => tableRef.value!.clearSelection()

// 初始化表格数据 && 拖拽排序
onMounted(() => {
  dragSort()
  props.requestAuto && getTableList()
  props.data && (pageable.value.total = props.data.length)
})

// 处理表格数据
const processTableData = computed(() => {
  if (!props.data) return tableData.value
  if (!props.pagination) return props.data
  return props.data.slice(
    (pageable.value.pageNum - 1) * pageable.value.pageSize,
    pageable.value.pageSize * pageable.value.pageNum,
  )
})

// 监听页面 initParam 改化，重新获取表格数据
watch(() => props.initParam, getTableList, { deep: true })

// 接收 columns 并设置为响应式
const tableColumns = reactive<ColumnProps[]>(props.columns)

// 扁平化 columns
const flatColumns = computed(() => flatColumnsFunc(tableColumns))

// 定义 enumMap 存储 enum 值（避免异步请求无法格式化单元格内容 || 无法填充搜索下拉选择）
const enumMap = ref(new Map<string, { [key: string]: any }[]>())
const setEnumMap = async ({ prop, enum: enumValue }: ColumnProps) => {
  if (!enumValue) return

  // 如果当前 enumMap 存在相同的值 return
  if (enumMap.value.has(prop!) && (typeof enumValue === 'function' || enumMap.value.get(prop!) === enumValue)) return

  // 当前 enum 为静态数据，则直接存储到 enumMap
  if (typeof enumValue !== 'function') return enumMap.value.set(prop!, unref(enumValue!))

  // 为了防止接口执行慢，而存储慢，导致重复请求，所以预先存储为[]，接口返回后再二次存储
  enumMap.value.set(prop!, [])

  // 当前 enum 为后台数据需要请求数据，则调用该请求接口，并存储到 enumMap
  const { data } = await enumValue()
  enumMap.value.set(prop!, data)
}

// 注入 enumMap
provide('enumMap', enumMap)

// 扁平化 columns 的方法
const flatColumnsFunc = (columns: ColumnProps[], flatArr: ColumnProps[] = []) => {
  columns.forEach(async col => {
    if (col._children?.length) flatArr.push(...flatColumnsFunc(col._children))
    flatArr.push(col)

    // column 添加默认 isShow && isSetting && isFilterEnum 属性值
    col.isShow = col.isShow ?? true
    col.isSetting = col.isSetting ?? true
    col.isFilterEnum = col.isFilterEnum ?? true

    // 设置 enumMap
    await setEnumMap(col)
  })
  return flatArr.filter(item => !item._children?.length)
}

// 过滤需要搜索的配置项 && 排序
const searchColumns = computed(() => {
  return flatColumns.value
    ?.filter(item => item.search?.el || item.search?.render)
    .sort((a, b) => a.search!.order! - b.search!.order!)
})

// 设置 搜索表单默认排序 && 搜索表单项的默认值
searchColumns.value?.forEach((column, index) => {
  column.search!.order = column.search?.order ?? index + 2
  const key = column.search?.key ?? handleProp(column.prop!)
  const defaultValue = column.search?.defaultValue
  if (defaultValue !== undefined && defaultValue !== null) {
    searchParam.value[key] = defaultValue
    searchInitParam.value[key] = defaultValue
  }
})

// 列设置 ==> 需要过滤掉不需要设置的列
const colRef = ref()
const colSetting = tableColumns!.filter(item => {
  const { type, prop, isSetting } = item
  return !columnTypes.includes(type!) && prop !== 'operation' && isSetting
})
const openColSetting = () => colRef.value.openColSetting()

// 定义 emit 事件
const emit = defineEmits<{
  search: [];
  reset: [];
  dragSort: [{ newIndex?: number; oldIndex?: number }];
}>()

const _search = () => {
  search()
  emit('search')
}

const _reset = () => {
  reset()
  emit('reset')
}

// 表格拖拽排序
const dragSort = () => {
  const tbody = document.querySelector(`#${uuid.value} tbody`) as HTMLElement
  Sortable.create(tbody, {
    handle: '.move',
    animation: 300,
    onEnd({ newIndex, oldIndex }) {
      const [removedItem] = processTableData.value.splice(oldIndex!, 1)
      processTableData.value.splice(newIndex!, 0, removedItem)
      emit('dragSort', { newIndex, oldIndex })
    },
  })
}

// 暴露给父组件的参数和方法 (外部需要什么，都可以从这里暴露出去)
defineExpose({
  element: tableRef,
  tableData: processTableData,
  radio,
  pageable,
  searchParam,
  searchInitParam,
  isSelected,
  selectedList,
  selectedListIds,

  // 下面为 function
  getTableList,
  search,
  reset,
  handleSizeChange,
  handleCurrentChange,
  clearSelection,
  enumMap,
})
</script>
