<template>
  <div id="data-table">
    <el-form :model="searchInfo" :inline="true" style="padding:0.9rem·1.875rem" size="mini" v-if="useFilter">
      <el-row type="flex">
        <el-col :span="22">
          <el-form-item v-for="(item, index) in filterList" :key="index">
            <template v-if="item.filter === 'select'">
              <el-select
                v-model="searchInfo[item.prop]"
                size="mini"
                clearable
                filterable
                :placeholder="`请选择${item.label}`"
                @clear="toClear(item.prop)"
                @change="data => filterReturn(data, item)"
              >
                <slot name="options" v-bind="{ item }"></slot>
              </el-select>
            </template>
            <template v-else-if="item.filter === 'date'">
              <el-date-picker
                v-model="searchInfo[item.prop]"
                value-format="yyyy-MM-dd"
                format="yyyy-MM-dd"
                type="daterange"
                range-separator="-"
                start-placeholder="开始日期"
                end-placeholder="结束日期"
                clearable
              >
              </el-date-picker>
            </template>
            <template v-else>
              <el-input v-model="searchInfo[item.prop]" clearable size="mini" :placeholder="`请输入${item.label}`" @clear="toClear(item.prop)"></el-input>
            </template>
          </el-form-item>
          <el-form-item>
            <el-button type="primary" size="mini" @click="filterSearch">查询</el-button>
          </el-form-item>
        </el-col>
        <el-col :span="2">
          <slot name="selfbtn"></slot>
        </el-col>
      </el-row>
    </el-form>

    <el-table
      ref="table"
      row-key="id"
      :data="data"
      border
      stripe
      size="mini"
      :max-height="height !== null ? height : ''"
      @select="handleSelectionChange"
      @select-all="handleSelectAll"
      v-bind="options"
      :show-summary="useSum"
      @row-click="rowClick"
      :summary-method="computedSum"
    >
      <el-table-column type="selection" width="55" v-if="select" prop="id" :reserve-selection="true"> </el-table-column>
      <template v-for="(item, index) in fields">
        <template v-if="!item.notable">
          <template v-if="item.custom">
            <el-table-column :key="index" align="center" :label="item.label" v-bind="item.options" :show-overflow-tooltip="item.showTip || true">
              <template v-slot="{ row }">
                <slot name="custom" v-bind="{ item, row }"></slot>
              </template>
            </el-table-column>
          </template>
          <template v-else>
            <el-table-column
              :key="index"
              align="center"
              :label="item.label"
              :prop="item.prop"
              :formatter="toFormatter"
              sortable
              v-bind="item.options"
              :show-overflow-tooltip="item.showTip || true"
            >
            </el-table-column>
          </template>
        </template>
      </template>
      <template v-if="opera.length > 0">
        <el-table-column label="操作" align="center" :width="operaWidth">
          <template v-slot="{ row, $index }">
            <template v-for="(item, index) in opera">
              <template v-if="display(item, row)">
                <el-tooltip v-if="item.icon" :key="index" effect="dark" :content="item.label" placement="bottom">
                  <el-button
                    :key="index"
                    type="text"
                    :icon="item.icon || ''"
                    size="mini"
                    @click="handleOpera(row, item.method, item.confirm, item.methodZh, item.label, $index)"
                  ></el-button>
                </el-tooltip>
                <!-- <el-button v-else :key="index" type="text" size="mini" @click="handleOpera(row, item.method, item.confirm, item.methodZh, item.label, $index)">
                  {{ item.label }}
                </el-button> -->
                <el-link
                  v-else
                  :key="`${item.model}-column-${index}`"
                  :type="item.type || 'primary'"
                  :icon="item.icon || ''"
                  size="mini"
                  style="padding-right:10px"
                  :underline="false"
                  @click="handleOpera(row, item.method, item.confirm, item.methodZh, item.label, $index)"
                >
                  {{ item.label }}
                </el-link>
              </template>
            </template>
          </template>
        </el-table-column>
      </template>
    </el-table>
    <el-row type="flex" align="middle" justify="end" style="padding-top:1rem" v-if="usePage">
      <el-col :span="24" style="text-align:right;">
        <el-pagination
          background
          layout="total, prev, pager, next"
          :page-sizes="[10, 15, 20, 50, 100]"
          :total="total"
          :page-size="limit"
          :current-page.sync="currentPage"
          @current-change="changePage"
          @size-change="sizeChange"
        >
        </el-pagination>
        <!-- sizes -->
      </el-col>
    </el-row>
  </div>
</template>

<script>
import _ from 'lodash';
export default {
  name: 'data-table',
  props: {
    fields: { type: Array, required: true },
    data: { type: Array, required: true },
    opera: { type: Array, default: () => [] },
    toFormat: null,
    height: null,
    select: { type: Boolean, default: false },
    selected: { type: Array, default: () => [] },
    usePage: { type: Boolean, default: true },
    total: { type: Number, default: 0 },
    options: null,
    useSum: { type: Boolean, default: false },
    sumcol: { type: Array, default: () => [] },
    sumres: { type: String, default: 'total' },
    filter: { type: Array, default: () => [] },
    operaWidth: { type: Number, default: 200 },
    limit: { type: Number, default: _.get(this, `$limit`, undefined) !== undefined ? this.$limit : process.env.VUE_APP_LIMIT * 1 || 10 },
  },
  components: {},
  data: () => ({
    pageSelected: [],
    currentPage: 1,
    // limit: _.get(this, `$limit`, undefined) !== undefined ? this.$limit : process.env.VUE_APP_LIMIT * 1 || 10,
    searchInfo: {},
    useFilter: true,
    filterList: [],
  }),
  created() {},
  computed: {},
  methods: {
    toFormatter(row, column, cellValue, index) {
      let this_fields = this.fields.filter(fil => fil.prop === column.property);
      if (this_fields.length > 0) {
        let format = _.get(this_fields[0], `format`, false);
        if (format) {
          let res;
          if (_.isFunction(format)) {
            res = format(cellValue);
          } else {
            res = this.toFormat({
              model: this_fields[0].prop,
              value: cellValue,
            });
          }
          return res;
        } else return cellValue;
      }
    },
    handleOpera(data, method, confirm = false, methodZh, label, index) {
      let self = true;
      if (_.isFunction(methodZh)) {
        methodZh = methodZh(data);
      } else if (!_.isString(methodZh)) {
        methodZh = label;
        self = false;
      }
      if (confirm) {
        this.$confirm(self ? methodZh : `您确认${methodZh}该数据?`, '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning',
        })
          .then(() => {
            this.$emit(method, { data, index });
          })
          .catch(() => {});
      } else {
        this.$emit(method, { data, index });
      }
    },
    handleSelectionChange(selection, row) {
      // console.log(selection);
      // console.log(row);
      //根据row是否再pageSelected中,判断是添加还是删除
      let res = [];
      if (this.pageSelected.find(i => i.id === row.id)) {
        res = this.pageSelected.filter(f => f.id !== row.id);
      } else {
        this.pageSelected.push(row);
        res = this.pageSelected;
      }
      this.$set(this, `pageSelected`, res);
      this.$emit(`handleSelect`, _.uniqBy(res, 'id'));
    },
    handleSelectAll(selection) {
      //处于没全选状态,选择之后一定是全选,只有处于全选状态时,才会反选(全取消)
      // console.log(selection);
      let res = [];
      if (selection.length > 0) {
        //全选
        res = _.uniqBy(this.pageSelected.concat(selection), 'id');
      } else {
        //全取消
        res = _.differenceBy(this.pageSelected, this.data, 'id');
      }
      this.$set(this, `pageSelected`, res);
      this.$emit(`handleSelect`, res);
    },
    initSelection() {
      this.$nextTick(() => {
        this.$refs.table.clearSelection();
        this.selected.forEach(info => {
          let d = this.data.filter(p => p.id === info.id);
          if (d.length > 0) this.$refs.table.toggleRowSelection(d[0]);
        });
      });
    },
    selectReset() {
      this.$refs.table.clearSelection();
    },
    display(item, row) {
      let display = _.get(item, `display`, true);
      if (display === true) return true;
      else {
        let res = display(row);
        return res;
      }
    },
    //
    changePage(page = this.currentPage) {
      this.$emit('query', { skip: (page - 1) * this.limit, limit: this.limit, ...this.searchInfo });
    },
    sizeChange(limit) {
      this.limit = limit;
      this.currentPage = 1;
      this.$emit('query', { skip: 0, limit: this.limit, ...this.searchInfo });
    },
    getFilterList() {
      let res = this.fields.filter(f => _.get(f, 'filter', false));
      this.$set(this, `useFilter`, res.length > 0);
      res.map(i => {
        if (i.filter === 'date' && this.searchInfo[i.porp] === undefined) this.$set(this.searchInfo, i.prop, []);
      });
      res = [...res, ...this.filter];
      this.$set(this, `filterList`, res);
    },
    filterSearch() {
      this.currentPage = 1;
      this.$emit('query', { skip: 0, limit: this.limit, ...this.searchInfo });
    },
    rowClick(row, column, event) {
      this.$emit(`rowClick`, row);
    },
    toClear(prop) {
      delete this.searchInfo[prop];
    },
    filterReturn(data, item) {
      let { prop, filterReturn } = item;
      if (filterReturn) this.$emit('filterReturn', { data, prop });
    },
    // 计算合计
    computedSum({ columns, data }) {
      if (columns.length <= 0 || data.length <= 0) return '';
      const result = [];
      const reg = new RegExp(/^\d+$/);
      for (const column of columns) {
        // 判断有没有prop属性
        const prop = _.get(column, 'property');
        if (!prop) {
          result.push('');
          continue;
        }
        // 判断是否需要计算
        const inlist = this.sumcol.find(f => f == prop);
        if (!inlist) {
          result.push('');
          continue;
        }
        let res = 0;
        // 整理出要计算的属性(只取出数字或者可以为数字的值)
        const resetList = data.map(i => {
          const d = _.get(i, prop);
          const res = reg.test(d);
          if (res) return d * 1;
          else return 0;
        });
        if (this.sumres === 'total') {
          res = this.totalComputed(resetList);
        } else if (this.sumres === 'avg') {
          res = this.avgComputed(resetList);
        } else if (this.sumres === 'max') {
          res = this.maxComputed(resetList);
        } else if (this.sumres === 'min') {
          res = this.minComputed(resetList);
        }
        result.push(res);
      }
      result[0] = '合计';
      return result;
    },
    // 合计计算
    totalComputed(data) {
      const total = data.reduce((p, n) => p + n, 0);
      return total;
    },
    // 平均值计算
    avgComputed(data) {
      const total = this.totalComputed(data);
      return _.round(_.divide(total, data.length), 2);
    },
    // 最大值计算
    maxComputed(data) {
      return _.max(data);
    },
    // 最小值计算
    minComputed(data) {
      return _.min(data);
    },
  },
  watch: {
    selected: {
      handler(val) {
        if (val.length > 0) {
          this.pageSelected = val;
          this.initSelection();
        }
      },
      immediate: true,
    },
    data: {
      handler(val, oval) {
        if (this.select) {
          this.initSelection();
        }
      },
    },
    fields: {
      handler(val, oval) {
        if (val) this.getFilterList();
      },
      immediate: true,
    },
  },
};
</script>

<style lang="less" scoped></style>
