define(["./dom-geometry", "./_base/lang", "./domReady", "./sniff", "./_base/window"],
	function(geometry, lang, domReady, has, baseWindow){

	// module:
	//		dojo/uacss

	/*=====
	return {
		// summary:
		//		Applies pre-set CSS classes to the top-level HTML node, based on:
		//
		//		- browser (ex: dj_ie)
		//		- browser version (ex: dj_ie6)
		//		- box model (ex: dj_contentBox)
		//		- text direction (ex: dijitRtl)
		//
		//		In addition, browser, browser version, and box model are
		//		combined with an RTL flag when browser text is RTL. ex: dj_ie-rtl.
		//
		//		Returns the has() method.
	};
	=====*/

	var
		html = baseWindow.doc.documentElement,
		ie = has("ie"),
		opera = has("opera"),
		maj = Math.floor,
		ff = has("ff"),
		boxModel = geometry.boxModel.replace(/-/,''),

		classes = {
			"dj_quirks": has("quirks"),

			// NOTE: Opera not supported by dijit
			"dj_opera": opera,

			"dj_khtml": has("khtml"),

			"dj_webkit": has("webkit"),
			"dj_safari": has("safari"),
			"dj_chrome": has("chrome"),

			"dj_gecko": has("mozilla"),

			"dj_ios": has("ios"),
			"dj_android": has("android")
		}; // no dojo unsupported browsers

	if(ie){
		classes["dj_ie"] = true;
		classes["dj_ie" + maj(ie)] = true;
		classes["dj_iequirks"] = has("quirks");
	}
	if(ff){
		classes["dj_ff" + maj(ff)] = true;
	}

	classes["dj_" + boxModel] = true;

	// apply browser, browser version, and box model class names
	var classStr = "";
	for(var clz in classes){
		if(classes[clz]){
			classStr += clz + " ";
		}
	}
	html.className = lang.trim(html.className + " " + classStr);

	// If RTL mode, then add dj_rtl flag plus repeat existing classes with -rtl extension.
	// We can't run the code below until the <body> tag has loaded (so we can check for dir=rtl).
	domReady(function(){
		if(!geometry.isBodyLtr()){
			var rtlClassStr = "dj_rtl dijitRtl " + classStr.replace(/ /g, "-rtl ");
			html.className = lang.trim(html.className + " " + rtlClassStr + "dj_rtl dijitRtl " + classStr.replace(/ /g, "-rtl "));
		}
	});
	return has;
});
