(function() {

    "use strict";

    angular
        .module("app")
        .directive("appPreloader", preloaderDirective);

    function preloaderDirective() {
        return {
            restrict: "E",
            replace: true,
            controller: preloaderController,
            controllerAs: "preloaderController",
            templateUrl: "directives/site-preloader/loaderDirectiveTemplate.html"
        };
    }

    function preloaderController($rootScope, $http) {
        var preloaderController = this;

        $rootScope.$watchCollection(getPendingRequests, function (newValue, oldValue) {
            if (newValue === oldValue) {
                return;
            }

            preloaderController.showPreloader = newValue.length > 0;
        });

        function getPendingRequests() {
            return $http.pendingRequests;
        }

    }

    // IoC container.
    preloaderController.$inject = ["$rootScope", "$http"];

})();