<template>
  <div class="table-list-com-ins" :class="{'is-empty-table' : !tableDataTotal,'no-pagination' : !hasQueryParams,'auto-max-height' : maxHeight}"
    :style="maxBodyFixedStyle">
    <div class="table-item">
      <el-table v-if="tableDataTotal>0" class="fixed-table" v-loading="tableLoading" :data="tableData" element-loading-text="Loading"
        ref="customTableRef" border fit highlight-current-row :default-sort="defaultSort?defaultSort:{}" @sort-change="sortChange"
        @selection-change="selectionChange" :cell-class-name="cellClassName" :cell-style="cellStyle" :row-class-name="rowClassName"
        :row-style="rowStyle" :height="height" :maxHeight="comMaxHeight" v-sticky-header="stickyHeader">
        <el-table-column type="selection" :width="needSelection.width ? needSelection.width : '38px'" v-if="needSelection.flag"
          :fixed="needSelection.fixed" :align="needSelection.align" :show-overflow-tooltip="needSelection.showOverflowTooltip">
        </el-table-column>
        <el-table-column type="index" v-if="isIndex" label="序号" :width="flexWidth(tableData)" align="left" :fixed="indexFixed" :resizable="false">
          <template slot-scope="scope">{{pagingHandler(hasQueryParams,queryParams,scope)}}</template>
        </el-table-column>

        <!-- 列二次封装 -->
        <template v-for="(item,index) of formColum">
          <table-list-column v-if="item.use !== false" :key="item.uid" :tableData="tableData" :item="item">
            <!-- 根据透传属性创建插槽 -->
            <template v-for="(fn, slotName) in $slots" :slot="slotName">
              <slot :name="slotName"></slot>
            </template>
            <template v-for="(fn, slotName) in $scopedSlots" :slot="slotName" slot-scope="scope">
              <slot :name="slotName" :data="scope.data" :row="scope.row" :row-index="scope.rowIndex"></slot>
            </template>
          </table-list-column>
        </template>

        <template slot="empty">
        </template>
      </el-table>

      <div class="table-empty-container" v-else>
        <no-data />
      </div>
    </div>

    <div class="pagination-box" v-if="show_page && hasQueryParams && tableDataTotal>queryParams.pageSize">
      <el-pagination background :current-page="current_page" :page-size="queryParams.pageSize" :total="tableDataTotal"
        layout="prev, pager, next, jumper" @current-change="handleCurrentChange" @size-change="handleSizeChange" />
    </div>

  </div>
</template>

<script>
import NoData from '@/components/NoData';
import TableListColumn from "@/components/CustomTable/components/TableListColumn";
import { generateRandomLowerCaseLetter } from "@/utils";
export default {
  name: "tableListCom",
  props: {
    height: {
      type: [String, Number]
    },
    maxHeight: {
      type: [Boolean, Number]
    },
    isIndex: {
      type: Boolean,
      default: false
    },
    needSelection: {
      type: Object,
      default: () => ({
        flag: false,
        width: "39px",
        fixed: false,
        align: "left",
        showOverflowTooltip: false
      })
    },
    cellClassName: {
      type: Function,
      default: () => { }
    },
    cellStyle: {
      type: Function,
      default: () => { }
    },
    rowClassName: {
      type: Function,
      default: () => { }
    },
    rowStyle: {
      type: Function,
      default: () => { }
    },
    // 吸顶偏移量
    stickyHeader: {
      type: Object,
      default: () => ({
        offsetBottom: '0px',
        offsetTop: "0px",
        show: false
      })
    },
    indexFixed: {
      type: Boolean,
      default: false
    },
    tableLoading: {
      type: Boolean,
      default: false
    },
    defaultSort: {
      type: Object,
      default: null
    },
    tableData: {
      type: Array,
      default: () => []
    },
    formColum: {
      type: Array,
      default: () => []
    },
    tableDataTotal: {
      type: Number,
      default: 0
    },
    queryParams: {
      type: Object,
      default: () => ({})
    },
    paging: {
      type: Boolean,
      default: true
    },
    MaxPage: {  //最大页码
      type: Number,
      default: 500
    },
  },
  components: {
    NoData,
    TableListColumn
  },
  data() {
    return {
      current_page: this.queryParams.pageNum,
      show_page: this.paging,
      comMaxHeight: null,
      hasQueryParams: false,
      comMaxBodyHeight: 0,
      headerLastBlockHeight: 0,
      observer: null,
      resizeTimer: null
    };
  },
  watch: {
    'queryParams.pageNum'(newVal, oldVal) {
      this.current_page = newVal;
    },
    queryParams: {
      handler(newValue) {
        const _temp = newValue ? newValue : {};
        const keys = Object.keys(_temp);
        if (keys.length) {
          this.hasQueryParams = true;
        } else {
          this.hasQueryParams = false;
        }
      },
      immediate: true,
      deep: true
    }
  },
  computed: {
    maxBodyFixedStyle() {
      return {
        "--body-max-height": `${this.comMaxBodyHeight}px`,
        "--header-last-block-height": `${this.headerLastBlockHeight}px`
      };
    }
  },
  created() {
    this.maxHeight ? this.maxHeightInit() : null;
    // 创建dom元素 监听器 ，容器出现变化 重新获取元素参数
    this.createResizeObserver();
  },
  beforeDestroy() {
    this.clearResizeTimer();
    if (this.observer) {
      this.observer.disconnect();
    }
  },
  methods: {
    async createResizeObserver() {
      this.observer = new ResizeObserver(entries => {
        this.clearResizeTimer();
        this.resizeTimer = setTimeout(() => {
          this.maxHeightInit(true);
        }, 1000);
      });
      await this.$nextTick();
      this.observer.observe(this.$el);
    },
    clearResizeTimer() {
      clearTimeout(this.resizeTimer);
      this.resizeTimer = null;
    },
    // 自适应当前容器
    async maxHeightInit(resize = false) {
      try {
        await this.$nextTick();
        // 固定数值
        const isFixedNumber = typeof this.maxHeight == "number";
        // 最大高度
        let containerMaxHeight = null;
        if (isFixedNumber && !resize) {
          containerMaxHeight = this.maxHeight;
        } else {
          /** 
           * @type {HTMLDivElement}
          */
          const container = this.$el;
          if (container) {
            // console.log(container.offsetHeight, "container.offsetHeight");
            containerMaxHeight = container.offsetHeight;
          }
        }
        // 列表自适应高度
        this.comMaxHeight = containerMaxHeight ? `${containerMaxHeight}px` : null;
        // 重新计算表格高度 减去滚动条高度差 16 - 6
        if (containerMaxHeight) {
          /** 
           * @type {HTMLDivElement}
          */
          const tableRightHeader = this.$el.querySelector(".el-table__fixed-header-wrapper");
          if (tableRightHeader) {
            const headerHeight = parseInt(window.getComputedStyle(tableRightHeader).height);
            //原滚动条高度为6px 差 10px
            const bodyMaxHeight = containerMaxHeight - headerHeight - 16;
            // console.log(bodyMaxHeight, "bodyMaxHeight");
            this.comMaxBodyHeight = bodyMaxHeight;
          } else {
            // 没有固定列 正常情况下 计算默认header高度
            const defaultHeader = this.$el.querySelector(".el-table__header-wrapper");
            if (defaultHeader) {
              const headerHeight = parseInt(window.getComputedStyle(defaultHeader).height);
              this.headerLastBlockHeight = headerHeight;
            }
          }
        }
      } catch (error) {
        console.log(error);
      }
    },
    pagingHandler(hasQueryParams, queryParams, scope) {
      // 有分页参数
      if (hasQueryParams) {
        return queryParams.pageNum * queryParams.pageSize - queryParams.pageSize + scope.$index + 1;
      }
      // 不分页
      return scope.$index + 1;
    },
    handleCurrentChange(e) {
      if (this.MaxPage < e) {
        this.show_page = false;
        this.$nextTick(() => {
          this.current_page = this.queryParams.pageNum;
          this.$message.warning(`对不起，最多只能访问${this.MaxPage}页`);
          this.show_page = true;
        });
      } else {
        this.$emit('handle-current-change', e);
      }
    },
    handleSizeChange(e) {
      this.$emit('handle-current-change', e);
    },
    sortChange(e) {
      this.$emit('sort-change', e);
    },
    selectionChange(selectionArray) {
      this.$emit("selectionChange", selectionArray);
    },
    flexWidth(tableData, width = 50) {
      let currentMax = this.queryParams.pageNum * this.queryParams.pageSize - this.queryParams.pageSize + tableData.length;
      if (currentMax.toString().length > 3) {
        width = width + (currentMax.toString().length - 3) * 10;
      }
      return width + 'px';
    }
  }
}
</script>

<style lang="scss" scoped>
.table-list-com-ins {
  /* 空数据样式 */
  &.is-empty-table {
    .table-item {
      max-height: unset;
      height: 100%;
    }
  }

  /* maxHeight自适应样式 */
  &.auto-max-height {
    height: 100%;
    ::v-deep .table-item {
      // 原滚动条为6px  现在多10px
      .el-table {
        /* 右侧fixed列 */
        .el-table__fixed-right {
          z-index: 9;
          right: 16px !important;
          bottom: 15px !important;
          .el-table__fixed-header-wrapper {
            position: absolute;
          }
        }
        .el-table__fixed-right-patch {
          width: 16px !important;
          z-index: 9;
          top: 0px;
          background: #f0f3fa;
          border: 1px solid #e6eaf1;
          border-left: unset;
          border-top: unset;
        }
        // 自动适配下 减去滚动条高度
        .el-table__fixed {
          height: calc(100% - 15px) !important;
        }
        .el-table__fixed-right {
          height: calc(100% - 15px) !important;
        }

        // 重新计算隐藏列表高度 减去滚动条16px高度
        .el-table__fixed-body-wrapper {
          max-height: var(--body-max-height) !important;
        }
      }
    }
  }

  /* 不需要分页 或没有分页参数 */
  &.no-pagination {
    ::v-deep .table-item {
      max-height: 100%;
    }
  }
  ::v-deep .table-item {
    width: 100%;
    max-height: calc(100% - 40px);

    .no-line-feed {
      display: block;
      color: #0081ff;
      cursor: pointer;
      width: 100%;
      white-space: nowrap;
      text-overflow: ellipsis;
      overflow: hidden;
    }

    .pagination-box {
      display: flex;
      align-items: center;
      justify-content: flex-end;
    }

    .el-table th.gutter {
      display: table-cell !important;
    }

    /* header 表头最后一个方块 */
    .el-table--border th.gutter:last-of-type {
      display: block !important;
      height: var(--header-last-block-height) !important;
      padding-right: 16px;
    }

    .el-table__body-wrapper::-webkit-scrollbar {
      width: 16px;
      height: 16px;
    }

    .el-scrollbar-warp::-webkit-scrollbar {
      width: 16px;
      height: 16px;
    }

    // 空状态容器
    .table-empty-container {
      width: 100%;
      height: 100%;
      min-height: 360px;
      box-sizing: border-box;
      display: flex;
      align-items: center;
      justify-content: center;

      .no-data {
        min-height: unset;
      }
    }

    .el-table {
      .el-table__header-wrapper {
        min-height: 40px;
      }
      .el-table__fixed {
        height: 100% !important;
      }
      .el-table__fixed-right {
        height: 100% !important;
      }
    }
  }

  ::v-deep .el-table__body tr.current-row > td.el-table__cell {
    background-color: #ffffff;
  }

  ::v-deep .el-table__row {
    &:nth-child(even) {
      background-color: #f9fcff;
      .more {
        background: #f8fbff;
        span {
          color: #0081ff;
        }
      }
    }
    &:nth-child(odd) {
      .more {
        span {
          color: #0081ff;
        }
      }
    }
  }

  ::v-deep .el-table th.el-table__cell.is-leaf,
  ::v-deep .el-table td.el-table__cell {
    border-bottom: 1px solid #e6eaf1;
  }
  ::v-deep .el-table--border .el-table__cell {
    border-right: 1px solid #e6eaf1;
  }
  ::v-deep .el-table__body tr.hover-row.current-row > td,
  ::v-deep .el-table__body tr.hover-row.el-table__row--striped.current-row > td,
  ::v-deep .el-table__body tr.hover-row.el-table__row--striped > td,
  ::v-deep .el-table__body tr.hover-row > td {
    background-color: #dcebff !important;
    .more {
      background: #dcebff;
    }
  }

  ::v-deep .el-table--enable-row-hover .el-table__body tr:hover > td {
    background-color: #dcebff;
  }
  ::v-deep .el-table__fixed {
    overflow-x: clip;
    overflow-y: clip;
  }
}
</style>
