$(function () {

	$.ua = {
		device: {},
		platform: {},
		browser: {},
		engine: {}
	};

	var ua = navigator.userAgent.toLowerCase(),
			uaDevice = $.ua.device,
			uaPlatform = $.ua.platform,
			uaBrowser = $.ua.browser,
			uaEngine = $.ua.engine;

	// DETECT DEVICE
	if (ua.match(/mobile/)) {
		uaDevice.name = 'device_mobile';
		uaDevice.mobile = true;
	} else if (ua.match(/tablet/)) {
		uaDevice.name = 'device_tablet';
		uaDevice.tablet = true;
	} else {
		uaDevice.name = 'device_desktop';
		uaDevice.unknown = true;
	}

	// DETECT PLATFORM
	if (ua.match(/windows nt 5.0/i)) {
		uaPlatform.name = 'platform_win_2k';
		uaPlatform.win = true;
	} else if (ua.match(/windows nt 5.1/i)) {
		uaPlatform.name = 'platform_win_xp';
		uaPlatform.win = true;
	} else if (ua.match(/windows nt 6.0/i)) {
		uaPlatform.name = 'platform_win_vista';
		uaPlatform.win = true;
	} else if (ua.match(/windows nt 6.1/i)) {
		uaPlatform.name = 'platform_win_7';
		uaPlatform.win = true;
	} else if (ua.match(/windows nt 6.2/i)) {
		uaPlatform.name = 'platform_win_8';
		uaPlatform.win = true;
	} else if (ua.match(/macintosh/i)) {
		uaPlatform.name = 'platform_mac';
		uaPlatform.mac = true;
	} else if (ua.match(/linux/i)) {
		uaPlatform.name = 'platform_linux';
		uaPlatform.linux = true;
	} else if (ua.match(/iphone|iPod/i)) {
		uaPlatform.name = 'platform_iphone';
		uaPlatform.iphone = true;
	} else if (ua.match(/ipad/i)) {
		uaPlatform.name = 'platform_ipad';
		uaPlatform.ipad = true;
	} else if (ua.match(/android/i)) {
		uaPlatform.name = 'platform_android';
		uaPlatform.android = true;
	} else {
		uaPlatform.name = 'platform_unknown';
		uaPlatform.unknown = true;
	}

	// DETECT BROWSER
	if (/msie/.test(ua)) {
		uaBrowser.name = 'browser_msie';
		uaBrowser.msie = true;
	} else if (/firefox/.test(ua)) {
		uaBrowser.name = 'browser_firefox';
		uaBrowser.firefox = true;
	} else if (/safari/.test(ua)) {
		uaBrowser.name = 'browser_safari';
		uaBrowser.safari = true;
	} else if (/opera/.test(ua)) {
		uaBrowser.name = 'browser_opera';
		uaBrowser.opera = true;
	} else {
		uaBrowser.name = 'browser_unknown';
		uaBrowser.unknown = true;
	}
	if (/chrome/.test(ua)) {
		uaBrowser.name = 'browser_chrome';
		uaBrowser.chrome = true;
		uaBrowser.safari = false;
	}

	// DETECT BROWSER VERSION
	if (uaBrowser.msie) {
		uaBrowser.version = /msie (\d+(\.\d+)*)/.exec(ua)[1];
	} else if (uaBrowser.firefox) {
		uaBrowser.version = /firefox\/(\d+(\.\d+)*)/.exec(ua)[1];
	} else if (uaBrowser.opera) {
		uaBrowser.version = /version\/? ?(\d+(\.\d+)*)/.exec(ua)[1];
	} else if (uaBrowser.safari) {
		uaBrowser.version = /version\/(\d+(\.\d+)*)/.exec(ua)[1];
	} else if (uaBrowser.chrome) {
		uaBrowser.version = /chrome\/(\d+(\.\d+)*)/.exec(ua)[1];
	} else {
		uaBrowser.version = 0;
	}

	// DETECT ENGINE
	if (/trident/.test(ua) || uaBrowser.msie) {
		uaEngine.name = 'engine_trident';
		uaEngine.trident = true;
	} else if (/gecko/.test(ua)) {
		uaEngine.name = 'engine_gecko';
		uaEngine.gecko = true;
	} else if (/presto/.test(ua)) {
		uaEngine.name = 'engine_presto';
		uaEngine.presto = true;
	} else {
		uaEngine.name = 'engine_unknown';
		uaEngine.unknown = true;
	}
	if (/webkit/.test(ua)) {
		uaEngine.name = 'engine_webkit';
		uaEngine.gecko = false;
		uaEngine.webkit = true;
	}

	// ADD CLASSES TO HTML TAG
	$('html').addClass([
		uaDevice.name,
		uaPlatform.name,
		uaBrowser.name,
		uaBrowser.name + "_v" + parseInt(uaBrowser.version, 10),
		uaEngine.name
	].join(' '));

});