export const download = (data: any, strFileName: string, strMimeType: string) => {
  var self:any = window, // this script is only for browsers anyway...
    defaultMime = "application/octet-stream", // this default mime also triggers iframe downloads
    mimeType = strMimeType || defaultMime,
    payload = data,
    url = !strFileName && !strMimeType && payload,
    anchor = document.createElement("a"),
    toString = function (a: any) {
      return String(a);
    },
    myBlob = self.Blob || self.MozBlob || self.WebKitBlob || toString,
    fileName = strFileName || "download",
    blob,
    reader;
  myBlob = myBlob.call ? myBlob.bind(self) : Blob;

  if (String(this) === "true") {
    //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
    payload = [payload, mimeType];
    mimeType = payload[0];
    payload = payload[1];
  }

  if (url && url.length < 2048) {
    // if no filename and no mime, assume a url was passed as the only argument
    fileName = url.split("/").pop().split("?")[0];
    anchor.href = url; // assign href prop to temp anchor
    if (anchor.href.indexOf(url) !== -1) {
      // if the browser determines that it's a potentially valid url path:
      var ajax = new XMLHttpRequest();
      ajax.open("GET", url, true);
      ajax.responseType = "blob";
      ajax.onload = function (e:any) {
        download(e.target.response, fileName, defaultMime);
      };
      setTimeout(function () {
        ajax.send();
      }, 0); // allows setting custom ajax headers using the return:
      return ajax;
    } // end if valid url?
  } // end if url?

  //go ahead and download dataURLs right away
  if (/^data:([\w+-]+\/[\w+.-]+)?[,;]/.test(payload)) {
    if (payload.length > 1024 * 1024 * 1.999 && myBlob !== toString) {
      payload = dataUrlToBlob(payload);
      mimeType = payload.type || defaultMime;
    } else {
      return (navigator as any).msSaveBlob // IE10 can't do a[download], only Blobs:
        ? (navigator as any).msSaveBlob(dataUrlToBlob(payload), fileName)
        : saver(payload); // everyone else can save dataURLs un-processed
    }
  } else {
    //not data url, is it a string with special needs?
    if (/([\x80-\xff])/.test(payload)) {
      var i = 0,
        tempUiArr = new Uint8Array(payload.length),
        mx = tempUiArr.length;
      for (i; i < mx; ++i) tempUiArr[i] = payload.charCodeAt(i);
      payload = new myBlob([tempUiArr], { type: mimeType });
    }
  }
  blob =
    payload instanceof myBlob
      ? payload
      : new myBlob([payload], { type: mimeType });

  function dataUrlToBlob(strUrl: string) {
    var parts:any = strUrl.split(/[:;,]/),
      type = parts[1],
      indexDecoder = strUrl.indexOf("charset") > 0 ? 3 : 2,
      decoder = parts[indexDecoder] == "base64" ? atob : decodeURIComponent,
      binData = decoder(parts.pop()),

      mx = binData.length,
      i = 0,
      uiArr = new Uint8Array(mx);

    for (i; i < mx; ++i) uiArr[i] = binData.charCodeAt(i);

    return new myBlob([uiArr], { type: type });
  }

  function saver(url: string, winMode?: boolean | undefined) {
    if ("download" in anchor) {
      //html5 A[download]
      anchor.href = url;
      anchor.setAttribute("download", fileName);
      anchor.className = "download-js-link";
      anchor.innerHTML = "downloading...";
      anchor.style.display = "none";
      anchor.addEventListener("click", function (e) {
        e.stopPropagation();
        this.removeEventListener("click", (arguments as any).callee);
      });
      document.body.appendChild(anchor);
      setTimeout(function () {
        anchor.click();
        document.body.removeChild(anchor);
        if (winMode === true) {
          setTimeout(function () {
            self.URL.revokeObjectURL(anchor.href);
          }, 250);
        }
      }, 66);
      return true;
    }

    // handle non-a[download] safari as best we can:
    if (
      /(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)
    ) {
      if (/^data:/.test(url))
        url = "data:" + url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
      if (!window.open(url)) {
        // popup blocked, offer direct download:
        if (
          confirm(
            "Displaying New Document\n\nUse Save As... to download, then click back to return to this page."
          )
        ) {
          location.href = url;
        }
      }
      return true;
    }

    //do iframe dataURL download (old ch+FF):
    var f = document.createElement("iframe");
    document.body.appendChild(f);

    if (!winMode && /^data:/.test(url)) {
      // force a mime that will download:
      url = "data:" + url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
    }
    f.src = url;
    setTimeout(function () {
      document.body.removeChild(f);
    }, 333);
  } //end saver

  if ((navigator as any).msSaveBlob) {
    // IE10+ : (has Blob, but not a[download] or URL)
    return (navigator as any).msSaveBlob(blob, fileName);
  }

  if (self.URL) {
    // simple fast and modern way using Blob and URL:
    saver(self.URL.createObjectURL(blob), true);
  } else {
    // handle non-Blob()+non-URL browsers:
    if (typeof blob === "string" || blob.constructor === toString) {
      try {
        return saver("data:" + mimeType + ";base64," + self.btoa(blob));
      } catch (y) {
        return saver("data:" + mimeType + "," + encodeURIComponent(blob));
      }
    }

    // Blob but not URL support:
    reader = new FileReader();
    reader.onload = function (e) {
      saver((this as any).result);
    };
    reader.readAsDataURL(blob);
  }
  return true;
};

export const getFileType = (fileName: string):string => {
  // 后缀获取
  let suffix = "";
  // 获取类型结果
  let result:any = "";
  try {
    const flieArr = fileName.split(".");
    suffix = flieArr[flieArr.length - 1];
  } catch (err) {
    suffix = "";
  }
  // fileName无后缀返回 false
  if (!suffix) {
    return '';
  }
  suffix = suffix.toLocaleLowerCase();
  // 图片格式
  const imglist = ["png", "jpg", "jpeg", "bmp", "gif"];
  // 进行图片匹配
  result = imglist.find((item) => item === suffix);
  if (result) {
    return "image";
  }
  // 匹配txt
  const txtlist = ["txt"];
  result = txtlist.find((item) => item === suffix);
  if (result) {
    return "txt";
  }
  // 匹配 excel
  const excelist = ["xls", "xlsx"];
  result = excelist.find((item) => item === suffix);
  if (result) {
    return "excel";
  }
  // 匹配 word
  const wordlist = ["doc", "docx"];
  result = wordlist.find((item) => item === suffix);
  if (result) {
    return "word";
  }
  // 匹配 pdf
  const pdflist = ["pdf"];
  result = pdflist.find((item) => item === suffix);
  if (result) {
    return "pdf";
  }
  // 匹配 ppt
  const pptlist = ["ppt", "pptx"];
  result = pptlist.find((item) => item === suffix);
  if (result) {
    return "ppt";
  }
  // 匹配 视频
  const videolist = [
    "mp4",
    "m2v",
    "mkv",
    "rmvb",
    "wmv",
    "avi",
    "flv",
    "mov",
    "m4v",
  ];
  result = videolist.find((item) => item === suffix);
  if (result) {
    return "video";
  }
  // 匹配 音频
  const radiolist = ["mp3", "wav", "wmv"];
  result = radiolist.find((item) => item === suffix);
  if (result) {
    return "radio";
  }
  // 其他 文件类型
  return "other";
};

/*
 * 使用download.js 强制浏览器下载图片、视频等文件
 * @param {any} url url链接地址
 * @param {any} strFileName 文件名
 * @param {any} strMimeType 文件类型
 */
export const downloadfile = (url: any, strFileName: string, strMimeType: string) => {
	var xmlHttp: any = null;
	if ((window as any).ActiveXObject) {
	  // IE6, IE5 浏览器执行代码
	  // xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
	} else if (window.XMLHttpRequest) {
	  // IE7+, Firefox, Chrome, Opera, Safari 浏览器执行代码
	  xmlHttp = new XMLHttpRequest();
	}
	//2.如果实例化成功，就调用open（）方法：
	if (xmlHttp != null) {
	  xmlHttp.open("get", url, true);
	  xmlHttp.responseType = "blob"; //关键
	  xmlHttp.send();
	  xmlHttp.onreadystatechange = doResult; //设置回调函数
	}
	function doResult() {
	  if (xmlHttp.readyState == 4) {
		//4表示执行完成
		if (xmlHttp.status == 200) {
		  //200表示执行成功
		  download(xmlHttp.response, strFileName, strMimeType);
		}
	  }
	}
  }