import *as XLSX from 'xlsx';

const sheet2blob = (sheet: any, sheetName: any) => {
  sheetName = sheetName || 'sheet1';
  var workbook: any = {
    SheetNames: [sheetName],
    Sheets: {}
  };
  workbook.Sheets[sheetName] = sheet;
  // 生成excel的配置项

  var wopts: XLSX.WritingOptions = {
    bookType: 'xlsx', // 要生成的文件类型
    bookSST: false,
    // 是否生成Shared String Table，官方解释是，如果开启生成速度会下降，但在低版本IOS设备上有更好的兼容性
    type: 'binary'
  };
  var wbout = XLSX.write(workbook, wopts);
  var blob = new Blob([s2ab(wbout)], {
    type: "application/octet-stream"
  });

  // 字符串转ArrayBuffer
  function s2ab(s: any) {
    var buf = new ArrayBuffer(s.length);
    var view = new Uint8Array(buf);
    for (var i = 0; i !== s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
    return buf;
  }

  return blob;
}

const openDownloadDialog = (url: any, saveName: string) => {
  // 此方法创建了a标签 利用a标签的download属性进行下载文件
  if (typeof url == 'object' && url instanceof Blob) {
    url = URL.createObjectURL(url); // 创建blob地址
  }
  var aLink = document.createElement('a');

  aLink.href = url;

  aLink.download = saveName || '';
  // HTML5新增的属性，指定保存文件名，可以不要后缀，注意，file:///模式下不会生效

  var event;
  if (window.MouseEvent) event = new MouseEvent('click');
  else {
    event = document.createEvent('MouseEvents');
    event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
  }
  aLink.dispatchEvent(event);
}

const exportRowData = (mode: any[], data: any,id:any) => {
  let _title = '当前数据';
  let _suffix = '.xlsx';

  let json: any[] = [];

  const _items: any = {};

  const _modeDist: any = {};

  mode.forEach((_mode: any) => {
    if (_mode?.group && _mode?.group?.length >= 1) {
      _mode?.group?.forEach((_item: any) => {
        _modeDist[_item.name] = _item.label;
      })
    } else {
      _modeDist[_mode.name] = _mode.label;
    }
  })


  Object.keys(data).forEach((_ele: any) => {
    if (_modeDist.hasOwnProperty(_ele)) {
      _items[_modeDist[_ele]] = data[_ele]
    }
  })
  json.push(_items)


  const sheet = XLSX.utils.json_to_sheet(json);

  openDownloadDialog(sheet2blob(sheet, undefined), '数据行' + _suffix);

}

export {
  exportRowData
}