import { openWindow } from '..';
import { dataURLtoBlob, urlToBase64 } from './base64Conver';
import * as XLSX from 'xlsx' // Vue3 版本
import fs from 'file-saver'
/**
 * Download online pictures
 * @param data
 * @param filename
 */
 export function exportElsxFile(json, fields, filename = '表格.xlsx') {
  json.forEach(item => {
      for (let i in item) {
          if (fields.hasOwnProperty(i)) {
              item[fields[i]] = item[i];
          }
          delete item[i]; //删除原先的对象属性
      }
  })

  let sheetName = filename //excel的文件名称
  let wb = XLSX.utils.book_new()  //工作簿对象包含一SheetNames数组，以及一个表对象映射表名称到表对象。XLSX.utils.book_new实用函数创建一个新的工作簿对象。
  let ws = XLSX.utils.json_to_sheet(json, { header: Object.values(fields) }) //将JS对象数组转换为工作表。
  wb.SheetNames.push(sheetName)
  wb.Sheets[sheetName] = ws
  const defaultCellStyle = { font: { name: "Verdana", sz: 13, color: "FF00FF88" }, fill: { fgColor: { rgb: "FFFFAA00" } } };//设置表格的样式
  let wopts = { bookType: 'xlsx', bookSST: false, type: 'binary', cellStyles: true, defaultCellStyle: defaultCellStyle, showGridLines: false }  //写入的样式
  let wbout = XLSX.write(wb, wopts)
  let blob = new Blob([s2ab(wbout)], { type: 'application/octet-stream' })
  fs.saveAs(blob, filename + '.xlsx')
}
const s2ab = s => {
  if (typeof ArrayBuffer !== 'undefined') {
      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
  } else {
      var buf = new Array(s.length);
      for (var i = 0; i != s.length; ++i) buf[i] = s.charCodeAt(i) & 0xFF;
      return buf;
  }
}

/**
 * Download online pictures
 * @param url
 * @param filename
 * @param mime
 * @param bom
 */
export function downloadByOnlineUrl(url: string, filename: string, mime?: string, bom?: BlobPart) {
  urlToBase64(url).then((base64) => {
    downloadByBase64(base64, filename, mime, bom);
  });
}

/**
 * Download pictures based on base64
 * @param buf
 * @param filename
 * @param mime
 * @param bom
 */
export function downloadByBase64(buf: string, filename: string, mime?: string, bom?: BlobPart) {
  const base64Buf = dataURLtoBlob(buf);
  downloadByData(base64Buf, filename, mime, bom);
}

/**
 * Download according to the background interface file stream
 * @param {*} data
 * @param {*} filename
 * @param {*} mime
 * @param {*} bom
 */
export function downloadByData(data: BlobPart, filename: string, mime?: string, bom?: BlobPart) {
  const blobData = typeof bom !== 'undefined' ? [bom, data] : [data];
  const blob = new Blob(blobData, { type: mime || 'application/octet-stream' });

  const blobURL = window.URL.createObjectURL(blob);
  const tempLink = document.createElement('a');
  tempLink.style.display = 'none';
  tempLink.href = blobURL;
  tempLink.setAttribute('download', filename);
  if (typeof tempLink.download === 'undefined') {
    tempLink.setAttribute('target', '_blank');
  }
  document.body.appendChild(tempLink);
  tempLink.click();
  document.body.removeChild(tempLink);
  window.URL.revokeObjectURL(blobURL);
}

/**
 * Download file according to file address
 * @param {*} sUrl
 */
export function downloadByUrl({
  url,
  target = '_blank',
  fileName,
}: {
  url: string;
  target?: TargetContext;
  fileName?: string;
}): boolean {
  const isChrome = window.navigator.userAgent.toLowerCase().indexOf('chrome') > -1;
  const isSafari = window.navigator.userAgent.toLowerCase().indexOf('safari') > -1;

  if (/(iP)/g.test(window.navigator.userAgent)) {
    console.error('Your browser does not support download!');
    return false;
  }
  if (isChrome || isSafari) {
    const link = document.createElement('a');
    link.href = url;
    link.target = target;

    if (link.download !== undefined) {
      link.download = fileName || url.substring(url.lastIndexOf('/') + 1, url.length);
    }

    if (document.createEvent) {
      const e = document.createEvent('MouseEvents');
      e.initEvent('click', true, true);
      link.dispatchEvent(e);
      return true;
    }
  }
  if (url.indexOf('?') === -1) {
    url += '?download';
  }

  openWindow(url, { target });
  return true;
}