jQuery(function($) {
	// parseUri 1.2.2
	// (c) Steven Levithan <stevenlevithan.com>
	// MIT License

	function parseUri (str) {
		var	o   = parseUri.options,
			m   = o.parser[o.strictMode ? "strict" : "loose"].exec(str),
			uri = {},
			i   = 14;

		while (i--) uri[o.key[i]] = m[i] || "";

		uri[o.q.name] = {};
		uri[o.key[12]].replace(o.q.parser, function ($0, $1, $2) {
			if ($1) uri[o.q.name][$1] = $2;
		});

		return uri;
	}

	parseUri.options = {
		strictMode: false,
		key: ["source","protocol","authority","userInfo","user","password","host","port","relative","path","directory","file","query","anchor"],
		q:   {
			name:   "queryKey",
			parser: /(?:^|&)([^&=]*)=?([^&]*)/g
		},
		parser: {
			strict: /^(?:([^:\/?#]+):)?(?:\/\/((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?))?((((?:[^?#\/]*\/)*)([^?#]*))(?:\?([^#]*))?(?:#(.*))?)/,
			loose:  /^(?:(?![^:@]+:[^:@\/]*@)([^:\/?#.]+):)?(?:\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/
		}
	};

	// --- parseUri ends ---

	//Find the menu item whose URL best matches the currently open page.
	var currentUri = parseUri(location.href);
	var bestMatch = {
		uri : null,
		link : null,
		matchingParams : -1,
		differentParams : 10000,
		isAnchorMatch : false,
		isTopMenu : false
	};

	$('#adminmenu li > a').each(function(index, link) {
		var $link = $(link);

		//Skip "#" links. Some plugins (e.g. S2Member 120703) use such no-op items as menu dividers.
		if ($link.attr('href') == '#') {
			return true;
		}

		var uri = parseUri(link.href);

		//Check for a close match - everything but query and #anchor.
		var components = ['protocol', 'host', 'port', 'user', 'password', 'path'];
		var isCloseMatch = true;
		for (var i = 0; (i < components.length) && isCloseMatch; i++) {
			isCloseMatch = isCloseMatch && (uri[components[i]] == currentUri[components[i]]);
		}

		if (!isCloseMatch) {
			return true; //Skip to the next link.
		}

		//Calculate the number of matching and different query parameters.
		var matchingParams = 0, differentParams = 0, param;
		for(param in uri.queryKey) {
			if (uri.queryKey.hasOwnProperty(param)) {
				if (currentUri.queryKey.hasOwnProperty(param) && (uri.queryKey[param] == currentUri.queryKey[param])) {
					matchingParams++;
				} else {
					differentParams++;
				}
			}
		}
		for(param in currentUri.queryKey) {
			if (currentUri.queryKey.hasOwnProperty(param) && !uri.queryKey.hasOwnProperty(param)) {
				differentParams++;
			}
		}

		var isAnchorMatch = uri.anchor == currentUri.anchor;
		var isTopMenu = $link.hasClass('menu-top');

		//Figure out if the current link is better than the best found so far.
		//To do that, we compare them by several criteria (in order of priority):
		var comparisons = [
			{
				better : (matchingParams > bestMatch.matchingParams),
				equal  : (matchingParams == bestMatch.matchingParams)
			},
			{
				better : (differentParams < bestMatch.differentParams),
				equal  : (differentParams == bestMatch.differentParams)
			},
			{
				better : (isAnchorMatch && (!bestMatch.isAnchorMatch)),
				equal  : (isAnchorMatch == bestMatch.isAnchorMatch)
			},
			{
				better : (!isTopMenu && bestMatch.isTopMenu),
				equal  : (isTopMenu == bestMatch.isTopMenu)
			}
		];

		var isBetterMatch = false,
			isEquallyGood = true,
			j = 0;

		while (isEquallyGood && !isBetterMatch && (j < comparisons.length)) {
			isBetterMatch = comparisons[j].better;
			isEquallyGood = comparisons[j].equal;
			j++;
		}

		if (isBetterMatch || isEquallyGood) {
			bestMatch = {
				uri : uri,
				link : $link,
				matchingParams : matchingParams,
				differentParams : differentParams,
				isAnchorMatch : isAnchorMatch,
				isTopMenu : isTopMenu
			}
		}
	});

	//Highlight and/or expand the best matching menu.
	if (bestMatch.link !== null) {
		var bestMatchLink = bestMatch.link;
		var parentMenu = bestMatchLink.closest('li.menu-top');
		//console.log('Best match is: ', bestMatchLink);

		var otherHighlightedMenus = $('li.wp-has-current-submenu, li.menu-top.current', '#adminmenu').not(parentMenu);

		var isWrongItemHighlighted = !bestMatchLink.hasClass('current');
		var isWrongMenuHighlighted = !parentMenu.is('.wp-has-current-submenu, .current') ||
		                              (otherHighlightedMenus.length > 0);

		if (isWrongMenuHighlighted) {
			//Account for users who use a plugin to keep all menus expanded.
			var shouldCloseOtherMenus = $('li.wp-has-current-submenu', '#adminmenu').length <= 1;
			if (shouldCloseOtherMenus) {
				otherHighlightedMenus.removeClass('wp-menu-open');
                otherHighlightedMenus.removeClass('wp-has-current-submenu current').addClass('wp-not-current-submenu');
			}

			var parentMenuAndLink = parentMenu.add('> a.menu-top', parentMenu);
			parentMenuAndLink.removeClass('wp-not-current-submenu');
			if (parentMenu.hasClass('wp-has-submenu')) {
				parentMenuAndLink.addClass('wp-has-current-submenu wp-menu-open');
			}
		}

		if (isWrongItemHighlighted) {
			$('#adminmenu .current').removeClass('current');
			bestMatchLink.addClass('current').closest('li').addClass('current');
		}
	}
});