"use strict";

/*
 * 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 enviorment
// https://stackoverflow.com/q/3277182/1008999
var _global = function () {
	// some use content security policy to disable eval
	try {
		return Function('return this')() || (42, eval)('this');
	} catch (e) {
		// every global should have circular reference
		// used for checking if someone writes var window = {}; var self = {}
		return 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('Depricated: 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);
	xhr.send();
	return xhr.status >= 200 && xhr.status <= 299;
} // `a.click()` don'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);
	}
}

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)
: 'download' in HTMLAnchorElement.prototype ? 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 approch
: '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 () {
				clikc(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 avalible 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) && typeof FileReader === 'object') {
		// 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
	}
};
