class ExportExcel {
  workBook = null;

  sheet = null;

  border = new GC.Spread.Sheets.LineBorder('#000', GC.Spread.Sheets.LineStyle.thin);

  excelIo = new GC.Spread.Excel.IO();

  $info = $('#excel-info');

  // 表格当前画到的行
  curRow = 0;

  billTree = null;

  curBillNode = null;

  libID = '';

  // 表格块，类型为ExcelBlock实例
  blocks = [];

  // 清单ID - 清单精灵映射
  billIDElfMap = {};

  // 叶子清单ID
  leafIDs = [];

  // 叶子清单总数量
  total = 0;

  constructor(workBook, billTree, libID) {
    this.workBook = workBook;
    this.sheet = this.workBook.getSheet(0);
    this.initSheet();
    this.billTree = billTree;
    this.libID = libID;
    this.leafIDs = billTree.items.filter(node => !node.children.length).map(node => node.data.ID);
    this.total = this.leafIDs.length;
  }

  // 导出
  async export() {
    if (!this.workBook) {
      return;
    }
    const json = this.workBook.toJSON();
    this.excelIo.save(json, function (blob) {
      saveAs(blob, '清单精灵排版.xlsx');
    }, function (e) {
        // process error
        alert(e);
        console.log(e);
    });

    }

    // 将数据画在表格上
    async paintOnSheet() {
      this.updateProcessInfo();
      // let i = 0;
      this.sheet.suspendPaint();
      this.sheet.suspendEvent();
      for (const billNode of this.billTree.items) {
        // 画标题
        if (this.curRow >= this.sheet.getRowCount()) {
          this.sheet.addRows(this.curRow, 2);
        }
        this.sheet.setFormatter(this.curRow, 0, '@');
        this.sheet.setFormatter(this.curRow, 1, '@');
        this.sheet.setText(this.curRow, 0, billNode.data.code);
        this.sheet.setText(this.curRow++, 1, billNode.data.name);
        // 画表格
        if (!billNode.children.length) {
          this.curRow++; // 空行
          const elfTree = await this.getElfTree(billNode.data.ID);
          if (!elfTree) {
            continue;
          }
          const block = this.getBlock(elfTree);
          if (!block.length) {
            continue;
          }
          const blockRange = this.getBlockRange(elfTree);
          this.checkRange(blockRange);
          const range = this.sheet.getRange(block[0].row + this.curRow, block[0].col, blockRange.rowCount, blockRange.colCount)
          // 画单元格
          console.log(billNode.data);
          console.log(block);
          this.drawCell(block);
          // 画边框
          this.drawBorder(range)
          // i++;
          this.curRow += blockRange.rowCount + 1;
        }
        /* if (i === 100) {
          break;
        } */
      }
      const range = this.sheet.getRange(0, 0, this.sheet.getRowCount(), this.sheet.getColumnCount());
      range.vAlign(GC.Spread.Sheets.VerticalAlign.center);
      range.wordWrap(true);
      this.sheet.resumeEvent();
      this.sheet.resumePaint();
      if (this.total === this.curProcessCount) {
        this.afterPaint();
      }
    }

  /* ========================================================以下为私有方法============================================== */

  // 当前到多少条叶子清单
  get curProcessCount () {
    return this.total - this.leafIDs.length;
  }

  // 画完表格后的处理
  afterPaint() {
      $('#excel-dialog').width('800px');
      $('#excel-spread').show();
      this.workBook.refresh();
      $('#export-excel-confirm').show();
  }

  // 超出范围追加行列
  checkRange(blockRange) {
    // 不够行数，追加行数
    const needRows = this.curRow + blockRange.rowCount;
    const curRowCount = this.sheet.getRowCount();
    if (curRowCount < needRows) {
      this.sheet.addRows(this.curRow, needRows - curRowCount + 5);
    }
    // 不够列数，追加列数
    const curColCount = this.sheet.getColumnCount();
    if (curColCount < blockRange.colCount) {
      this.sheet.addColumns(curColCount - 1, blockRange.colCount - curColCount);
    }
  }

  // 画单元格、合并单元格
  drawCell(block) {
    block.forEach(item => {
      const row = item.row + this.curRow;
      this.sheet.addSpan(row, item.col, item.rowCount, item.colCount);
      this.sheet.setFormatter(row, item.col, '@');
      this.sheet.setText(row, item.col, item.text);
    });
  }

  // 画边框
  drawBorder(range) {
    range.setBorder(this.border, { all: true })
  }

  // 更新进度信息
  updateProcessInfo() {
    this.$info.text(`导出清单中: ${this.curProcessCount} / ${this.total}`)
  }

  // 精灵树数据转换为表格块单元格数据
  getBlock(elfTree) {
    return elfTree.items.map(node => {
      // rowCount、colCount标记合并单元格范围
      const rowCount = node.posterityLeafCount() || 1;
      const parentRow = node.parent && node.parent.cellInfo ? node.parent.cellInfo.row : 0;
      // let prevRowCount = node.preSibling && node.preSibling.cellInfo ? node.preSibling.cellInfo.row + node.preSibling.cellInfo.rowCount - parentRow  : 0;
      const prev = node.prevNode();
      let prevRowCount = prev && prev.cellInfo ? prev.cellInfo.row + prev.cellInfo.rowCount - parentRow  : 0;
      const row = parentRow + prevRowCount;
      const col = node.depth();
      const name = node.data.type === itemType.ration ? node.data.name.split(' ')[0] : node.data.name;
      const text = `${isProcessNode(node) && node.data.require ? '* ' : ''}${name}`
      node.cellInfo = {
        row,
        col,
        rowCount,
      };
      return {
        row,
        col,
        rowCount,
        text,
        colCount: 1,
      }
    })
  }

  // 根据精灵树数据，获取表格块range
  getBlockRange(elfTree) {
    const rowCount = elfTree.roots.reduce((prev, node) => prev + (node.posterityLeafCount() || 1), 0);
    const a = Date.now();
    const colCount = Math.max(...elfTree.items.map(node => node.depth())) + 1;
    console.log(Date.now() - a);
    return {
      rowCount,
      colCount
    }
  }

  // 获取清单的精灵树
  async getElfTree(billID) {
    const items = await this.getElfItems(billID);
    if (!items || !items.length) {
      return null;
    }
    const tree = idTree.createNew({ id: 'ID', pid: 'ParentID', nid: 'NextSiblingID', rootId: -1, autoUpdate: true });
    tree.loadDatas(items);
    return tree;
  }

  // 获取清单的精灵数据
  async getElfItems(billID) {
    if (this.billIDElfMap[billID]) {
      return this.billIDElfMap[billID];
    }
    if (!this.leafIDs.length) {
      return null;
    }
    const count = 20; // 每次拉取数据条数
    const billIDs = this.leafIDs.splice(0, count)
    await setTimeoutSync(null, 100);
    const items = await ajaxPost('/billsGuidance/api/getItemsByBillIDs', { guidanceLibID: this.libID, billIDs });
    this.updateProcessInfo();
    items.forEach(item => {
      (this.billIDElfMap[item.billsID] || (this.billIDElfMap[item.billsID] = [])).push(item)
    });
    return this.billIDElfMap[billID];
  }

  initSheet() {
    this.sheet.name('清单精灵');
    for (let col = 0; col < this.sheet.getColumnCount(); col++) {
      this.sheet.setColumnWidth(col, 100);
    }
  }
}