//download.js v4.2, by dandavis; 2008-2016. [CCBY2] see http://danml.com/download.html for tests/usage
// v1 landed a FF+Chrome compat way of downloading strings to local un-named files, upgraded to use a hidden frame and optional mime
// v2 added named files via a[download], msSaveBlob, IE (10+) support, and window.URL support for larger+faster saves than dataURLs
// v3 added dataURL and Blob Input, bind-toggle arity, and legacy dataURL fallback was improved with force-download mime and base64 support. 3.1 improved safari handling.
// v4 adds AMD/UMD, commonJS, and plain browser support
// v4.1 adds url download capability via solo URL argument (same domain/CORS only)
// v4.2 adds semantic variable names, long (over 2MB) dataURL support, and hidden by default temp anchors
// https://github.com/rndme/download

(function (root, factory) {
	if (typeof define === 'function' && define.amd) {
		// AMD. Register as an anonymous module.
		define([], factory);
	} else if (typeof exports === 'object') {
		// Node. Does not work with strict CommonJS, but
		// only CommonJS-like environments that support module.exports,
		// like Node.
		module.exports = factory();
	} else {
		// Browser globals (root is window)
		root.download = factory();
	}
}(this, function () {

	return function download(data, strFileName, strMimeType) {

		var self = window, // this script is only for browsers anyway...
			defaultMime = "application/octet-stream", // this default mime also triggers iframe downloads
			mimeType = strMimeType || defaultMime,
			payload = DealText(data),
			url = !strFileName && !strMimeType && payload,
			anchor = document.createElement("a"),
			toString = function (a) { 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",DealText( url), true);
		//		ajax.responseType = 'blob';
		//		ajax.onload = function (e) {
		//			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.msSaveBlob ?  // IE10 can't do a[download], only Blobs:
					navigator.msSaveBlob(dataUrlToBlob(payload), fileName) :
					saver(payload); // everyone else can save dataURLs un-processed
			}

		}//end if dataURL passed?

		blob = new myBlob([payload], { type: mimeType });


		function dataUrlToBlob(strUrl) {
			var parts = strUrl.split(/[:;,]/),
				type = parts[1],
				decoder = parts[2] == "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, winMode) {

			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";
				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)) {
			//	url = 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) { // 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.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)
			return navigator.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.result);
			//};
			//reader.readAsDataURL(blob);
		}
		return true;
	}; /* end download() */
}));