define(["./has"], function(has){
	// module:
	//		dojo/sniff

	/*=====
	return function(){
		// summary:
		//		This module sets has() flags based on the current browser.
		//		It returns the has() function.
	};
	=====*/

	if(has("host-browser")){
		var n = navigator,
			dua = n.userAgent,
			dav = n.appVersion,
			tv = parseFloat(dav);
		has.add("air", dua.indexOf("AdobeAIR") >= 0);
		has.add("wp", parseFloat(dua.split("Windows Phone")[1]) || undefined);
		has.add("msapp", parseFloat(dua.split("MSAppHost/")[1]) || undefined);
		has.add("khtml", dav.indexOf("Konqueror") >= 0 ? tv : undefined);
		has.add("edge", parseFloat(dua.split("Edge/")[1]) || undefined);
		has.add("opr", parseFloat(dua.split("OPR/")[1]) || undefined);
		// NOTE: https://dev.opera.com/blog/opera-user-agent-strings-opera-15-and-beyond/
		has.add("webkit", !has("wp") // NOTE: necessary since Windows Phone 8.1 Update 1, see #18540
			&& !has("edge") && parseFloat(dua.split("WebKit/")[1]) || undefined);
		has.add("chrome", !has("edge") && !has("opr")
				&& parseFloat(dua.split("Chrome/")[1]) || undefined);
		has.add("android", !has("wp") // NOTE: necessary since Windows Phone 8.1 Update 1, see #18528
				&& parseFloat(dua.split("Android ")[1]) || undefined);
		has.add("safari", dav.indexOf("Safari") >= 0
				&& !has("wp") // NOTE: necessary since Windows Phone 8.1 Update 1, see #18540
				&& !has("chrome") && !has("android") && !has("edge") && !has("opr") ?
			parseFloat(dav.split("Version/")[1]) : undefined);
		has.add("mac", dav.indexOf("Macintosh") >= 0);
		has.add("quirks", document.compatMode == "BackCompat");
		if(!has("wp") // NOTE: necessary since Windows Phone 8.1 Update 1, see #18528
				&& dua.match(/(iPhone|iPod|iPad)/)){
			var p = RegExp.$1.replace(/P/, "p");
			var v = dua.match(/OS ([\d_]+)/) ? RegExp.$1 : "1";
			var os = parseFloat(v.replace(/_/, ".").replace(/_/g, ""));
			has.add(p, os);		// "iphone", "ipad" or "ipod"
			has.add("ios", os);
		}
		has.add("bb", (dua.indexOf("BlackBerry") >= 0 || dua.indexOf("BB10") >= 0) && parseFloat(dua.split("Version/")[1]) || undefined);
		has.add("trident", parseFloat(dav.split("Trident/")[1]) || undefined);

		has.add("svg", typeof SVGAngle !== "undefined");

		if(!has("webkit")){
			// Opera
			if(dua.indexOf("Opera") >= 0){
				// see http://dev.opera.com/articles/view/opera-ua-string-changes and http://www.useragentstring.com/pages/Opera/
				// 9.8 has both styles; <9.8, 9.9 only old style
				has.add("opera", tv >= 9.8 ? parseFloat(dua.split("Version/")[1]) || tv : tv);
			}

			// Mozilla and firefox
			if(dua.indexOf("Gecko") >= 0 && !has("wp") // NOTE: necessary since Windows Phone 8.1 Update 1
					&& !has("khtml") && !has("trident") && !has("edge")){
				has.add("mozilla", tv);
			}
			if(has("mozilla")){
				//We really need to get away from this. Consider a sane isGecko approach for the future.
				has.add("ff", parseFloat(dua.split("Firefox/")[1] || dua.split("Minefield/")[1]) || undefined);
			}

			// IE
			if(document.all && !has("opera")){
				var isIE = parseFloat(dav.split("MSIE ")[1]) || undefined;

				//In cases where the page has an HTTP header or META tag with
				//X-UA-Compatible, then it is in emulation mode.
				//Make sure isIE reflects the desired version.
				//document.documentMode of 5 means quirks mode.
				//Only switch the value if documentMode's major version
				//is different from isIE's major version.
				var mode = document.documentMode;
				if(mode && mode != 5 && Math.floor(isIE) != mode){
					isIE = mode;
				}

				has.add("ie", isIE);
			}

			// Wii
			has.add("wii", typeof opera != "undefined" && opera.wiiremote);
		}
	}

	return has;
});