public static class ResourceAggregatorHelper
    {
        public static string CSSKey = "pageCSSList";
        public static string JSKey = "pageJSList";
        public static string TmplKey = "pageTmplList";        

        private static void AddToDictionary(HtmlHelper helper, string[] files, string key)
        {
            if (files == null || files.Length == 0)
                return;

            TempDataDictionary dict = helper.ViewContext.TempData;
            if (!dict.ContainsKey(key))
                dict.Add(key, new List<string>());

            (dict[key] as List<string>).AddRange(files);
        }

        private static void InsertToDictionary(HtmlHelper helper, string[] files, string key)
        {
            if (files == null || files.Length == 0)
                return;

            TempDataDictionary dict = helper.ViewContext.TempData;
            if (!dict.ContainsKey(key))
                dict.Add(key, new List<string>());

            (dict[key] as List<string>).InsertRange(0, files);
        }

        private static string GetCSVFromDictionary(HtmlHelper helper, string key)
        {
            if (!helper.ViewContext.TempData.ContainsKey(key))
                return String.Empty;
            else
                return String.Join(",", (helper.ViewContext.TempData[key] as List<string>));
        }

        public static void AddCSS(this HtmlHelper helper, params string[] files)
        {
            AddToDictionary(helper, files, CSSKey);
        }

        public static void AddCSSToTop(this HtmlHelper helper, params string[] files)
        {
            InsertToDictionary(helper, files, CSSKey);
        }

        public static string GetCSS(this HtmlHelper helper)
        {
            return GetCSVFromDictionary(helper, CSSKey);
        }

        public static MvcHtmlString GetCSSLink(this HtmlHelper helper, bool ignoreCache = false)
        {
            if (!helper.ViewContext.TempData.ContainsKey(CSSKey))
                return MvcHtmlString.Empty;
            else
            {
                UrlHelper urlHelper = new UrlHelper(helper.ViewContext.RequestContext);
                var url = urlHelper.RouteUrl("resCSS", new { area = "", fileCsv = helper.Encode(GetCSVFromDictionary(helper, CSSKey)) });
                var link = "<link href=\"{0}\" rel=\"stylesheet\" type=\"text/css\" />".FormatWith(url);
                return MvcHtmlString.Create(link);
            }
        }

        public static void AddJS(this HtmlHelper helper, params string[] files)
        {
            AddToDictionary(helper, files, JSKey);
        }

        public static void AddJSToTop(this HtmlHelper helper, params string[] files)
        {
            InsertToDictionary(helper, files, JSKey);
        }

        public static string GetJS(this HtmlHelper helper)
        {
            return GetCSVFromDictionary(helper, JSKey);
        }

        public static MvcHtmlString GetJSLink(this HtmlHelper helper, bool ignoreCache = false)
        {
            if (!helper.ViewContext.TempData.ContainsKey(JSKey))
                return MvcHtmlString.Empty;
            else
            {
                UrlHelper urlHelper = new UrlHelper(helper.ViewContext.RequestContext);
                var url = urlHelper.RouteUrl("resJS", new { area = "", fileCsv = helper.Encode(GetCSVFromDictionary(helper, JSKey)) });
                var link = "<script src=\"{0}\" type=\"text/javascript\"></script>".FormatWith(url);
                return MvcHtmlString.Create(link);
            }
        }

        public static void AddTmpl(this HtmlHelper helper, params string[] files)
        {
            AddToDictionary(helper, files, TmplKey);
        }

        public static void AddTmplToTop(this HtmlHelper helper, params string[] files)
        {
            InsertToDictionary(helper, files, TmplKey);
        }

        public static string GetTmpl(this HtmlHelper helper)
        {
            return GetCSVFromDictionary(helper, TmplKey);
        }

        public static MvcHtmlString GetTmplLink(this HtmlHelper helper, bool ignoreCache = false)
        {
            if (!helper.ViewContext.TempData.ContainsKey(TmplKey))
                return MvcHtmlString.Empty;
            else
            {
                UrlHelper urlHelper = new UrlHelper(helper.ViewContext.RequestContext);
                var url = urlHelper.RouteUrl("resTmpl", new { area = "", fileCsv = helper.Encode(GetCSVFromDictionary(helper, TmplKey)) });
                return MvcHtmlString.Create(url);
            }
        }
    }