interface KnockoutBindingHandlers {
    tabIndex: KnockoutBindingHandler;
}

module ssp {
    ko.bindingHandlers.tabIndex = {
        init: (element: HTMLElement, valueAccessor: () => any, allBindings: KnockoutAllBindingsAccessor, viewModel, bindingContext: KnockoutBindingContext) => {
            var tabIndex: KnockoutObservable<number> = valueAccessor();

            if (!ko.isObservable(tabIndex))
                throw "!ko.isObservable(tabIndex)";

            var updateScope = new ActionScope();
            var tabs = $(element).find("a[data-toggle='tab']");

            if (tabs.length < 1)
                throw "tabs.length < 1";

            tabs.on("show.bs.tab", (e: Event) => {
                updateScope.tryExecuteOnce(() => {
                    var ti: number = null;

                    tabs.each((i, v) => {
                        if (v == e.target) {
                            ti = i;
                            return false;
                        }
                    });

                    if (ti == null)
                        throw "ti == null";

                    tabIndex(ti);
                });
            });

            var updateCore = ko.computed(() => {
                var ti = tabIndex();

                updateScope.tryExecuteOnce(() => {
                    ti = Math.max(ti, 0);
                    ti = Math.min(ti, tabs.length - 1);
                    $(tabs[ti]).tab("show");
                });
            });

            ko.utils.domNodeDisposal.addDisposeCallback(element, () => {
                updateCore.dispose();
            });
        }
    };
} 

    public class AuthorizeApiAttribute : AuthorizeAttribute
    {
        public AuthorizeApiAttribute()
        { }

        public AuthorizeApiAttribute(params string[] roles)
        {
            Roles = string.Join(",", roles);
        }
    }

    public class AuthorizeApiAttribute : AuthorizeAttribute
    {
        public AuthorizeApiAttribute()
        { }

        public AuthorizeApiAttribute(params string[] roles)
        {
            Roles = string.Join(",", roles);
        }
    }