/*
 * FileSaver.js
 * A saveAs() FileSaver implementation.
 *
 * By Eli Grey, http://eligrey.com
 *
 * License : https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md (MIT)
 * source  : http://purl.eligrey.com/github/FileSaver.js
 */

// The one and only way of getting global scope in all environments
// https://stackoverflow.com/q/3277182/1008999
var _global = typeof window === "object" && window.window === window ? window : typeof self === "object" && self.self === self ? self : typeof global === "object" && global.global === global ? global : this;

function bom(blob, opts) {
    if (typeof opts === "undefined") opts = { autoBom: false };
    else if (typeof opts !== "object") {
        console.warn("Deprecated: Expected third argument to be a object");
        opts = { autoBom: !opts };
    }

    // prepend BOM for UTF-8 XML and text/* types (including HTML)
    // note: your browser will automatically convert UTF-16 U+FEFF to EF BB BF
    if (opts.autoBom && /^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) {
        return new Blob([String.fromCharCode(0xfeff), blob], { type: blob.type });
    }
    return blob;
}

function download(url, name, opts) {
    var xhr = new XMLHttpRequest();
    xhr.open("GET", url);
    xhr.responseType = "blob";
    xhr.onload = function () {
        saveAs(xhr.response, name, opts);
    };
    xhr.onerror = function () {
        console.error("could not download file");
    };
    xhr.send();
}

function corsEnabled(url) {
    var xhr = new XMLHttpRequest();
    // use sync to avoid popup blocker
    xhr.open("HEAD", url, false);
    try {
        xhr.send();
    } catch (e) {}
    return xhr.status >= 200 && xhr.status <= 299;
}

// `a.click()` doesn't work for all browsers (#465)
function click(node) {
    try {
        node.dispatchEvent(new MouseEvent("click"));
    } catch (e) {
        var evt = document.createEvent("MouseEvents");
        evt.initMouseEvent("click", true, true, window, 0, 0, 0, 80, 20, false, false, false, false, 0, null);
        node.dispatchEvent(evt);
    }
}

// Detect WebView inside a native macOS app by ruling out all browsers
// We just need to check for 'Safari' because all other browsers (besides Firefox) include that too
// https://www.whatismybrowser.com/guides/the-latest-user-agent/macos
var isMacOSWebView = _global.navigator && /Macintosh/.test(navigator.userAgent) && /AppleWebKit/.test(navigator.userAgent) && !/Safari/.test(navigator.userAgent);

var saveAs =
    _global.saveAs ||
    // probably in some web worker
    (typeof window !== "object" || window !== _global
        ? function saveAs() {
              /* noop */
          }
        : // Use download attribute first if possible (#193 Lumia mobile) unless this is a macOS WebView
        "download" in HTMLAnchorElement.prototype && !isMacOSWebView
        ? function saveAs(blob, name, opts) {
              var URL = _global.URL || _global.webkitURL;
              var a = document.createElement("a");
              name = name || blob.name || "download";

              a.download = name;
              a.rel = "noopener"; // tabnabbing

              // TODO: detect chrome extensions & packaged apps
              // a.target = '_blank'

              if (typeof blob === "string") {
                  // Support regular links
                  a.href = blob;
                  if (a.origin !== location.origin) {
                      corsEnabled(a.href) ? download(blob, name, opts) : click(a, (a.target = "_blank"));
                  } else {
                      click(a);
                  }
              } else {
                  // Support blobs
                  a.href = URL.createObjectURL(blob);
                  setTimeout(function () {
                      URL.revokeObjectURL(a.href);
                  }, 4e4); // 40s
                  setTimeout(function () {
                      click(a);
                  }, 0);
              }
          }
        : // Use msSaveOrOpenBlob as a second approach
        "msSaveOrOpenBlob" in navigator
        ? function saveAs(blob, name, opts) {
              name = name || blob.name || "download";

              if (typeof blob === "string") {
                  if (corsEnabled(blob)) {
                      download(blob, name, opts);
                  } else {
                      var a = document.createElement("a");
                      a.href = blob;
                      a.target = "_blank";
                      setTimeout(function () {
                          click(a);
                      });
                  }
              } else {
                  navigator.msSaveOrOpenBlob(bom(blob, opts), name);
              }
          }
        : // Fallback to using FileReader and a popup
          function saveAs(blob, name, opts, popup) {
              // Open a popup immediately do go around popup blocker
              // Mostly only available on user interaction and the fileReader is async so...
              popup = popup || open("", "_blank");
              if (popup) {
                  popup.document.title = popup.document.body.innerText = "downloading...";
              }

              if (typeof blob === "string") return download(blob, name, opts);

              var force = blob.type === "application/octet-stream";
              var isSafari = /constructor/i.test(_global.HTMLElement) || _global.safari;
              var isChromeIOS = /CriOS\/[\d]+/.test(navigator.userAgent);

              if ((isChromeIOS || (force && isSafari) || isMacOSWebView) && typeof FileReader !== "undefined") {
                  // Safari doesn't allow downloading of blob URLs
                  var reader = new FileReader();
                  reader.onloadend = function () {
                      var url = reader.result;
                      url = isChromeIOS ? url : url.replace(/^data:[^;]*;/, "data:attachment/file;");
                      if (popup) popup.location.href = url;
                      else location = url;
                      popup = null; // reverse-tabnabbing #460
                  };
                  reader.readAsDataURL(blob);
              } else {
                  var URL = _global.URL || _global.webkitURL;
                  var url = URL.createObjectURL(blob);
                  if (popup) popup.location = url;
                  else location.href = url;
                  popup = null; // reverse-tabnabbing #460
                  setTimeout(function () {
                      URL.revokeObjectURL(url);
                  }, 4e4); // 40s
              }
          });

_global.saveAs = saveAs.saveAs = saveAs;

if (typeof module !== "undefined") {
    module.exports = saveAs;
}
