import { openWindow } from '@/main';
import { dataURLtoBlob, urlToBase64 } from './base64Conver';

/**
 * Download online pictures
 * @param url
 * @param filename
 * @param mime
 * @param bom
 */
export function downloadByOnlineUrl(url: string, filename: string, mime?: string, bom?: BlobPart) {
  console.log('downloadByOnlineUrl');
  urlToBase64(url).then((base64) => {
    console.log('base64', 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);
  console.log('base64Buf', base64Buf);
  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;
    link.setAttribute('referrerPolicy', 'origin');

    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;
}

function getBlob(url) {
  // url:是文件在oss上的地址
  return new Promise((resolve) => {
    const xhr = new XMLHttpRequest();
    xhr.open('GET', url, true);
    xhr.responseType = 'blob'; // 请求类型是blob类型
    // xhr.crossOrigin = '*'; // 解决跨域问题
    xhr.onload = () => {
      if (xhr.status === 200) {
        resolve(xhr.response);
      }
    };
    xhr.send();
  });
}

function saveAs(blob, filename) {
  if (window.navigator.userAgent.includes('MSIE ') ||
    window.navigator.userAgent.includes('Trident/') ||
    window.navigator.userAgent.includes('Edge/')) {
    // 仅在IE或旧Edge中执行
    (window.navigator as any).msSaveOrOpenBlob(blob, filename);
  } else {
    // 其他现代浏览器的处理方式
    const link = document.createElement('a');
    const url = window.URL.createObjectURL(blob);
    link.href = url;
    link.download = filename;
    link.style.display = 'none';
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
    window.URL.revokeObjectURL(url);
  }
}

export const downloadByA = (url, fileName) => {
  getBlob(url).then((res) => {
    //url:文件在oss上的地址
    saveAs(res, fileName); // filename:文件名，可自定义
  });
  // return axios
  //   .get(url, {
  //     responseType: 'blob',
  //   })
  //   .then((res) => {
  //     const blob = new Blob([res]);
  //     const href = window.URL.createObjectURL(blob);
  //     const a = document.createElement('a');
  //     a.setAttribute('href', href);
  //     a.setAttribute('download', `${fileName}`);
  //     document.body.appendChild(a);
  //     a.click();
  //     document.body.removeChild(a); // 下载完成移除元素
  //     window.URL.revokeObjectURL(href); // 释放掉blob对象
  //   });
};