(function() {


    "use strict";

    angular.module("shared")
        .service("resourceSorting", ["ResourceList","constantValues", function (ResourceList,constantValues) {

            var sortKey = 'resource-card-sort';
            getSavedSort();

            function saveSort(sort) {
                sessionStorage.removeItem(sortKey);
                if (sort) {
                    sessionStorage.setItem(sortKey,sort);
                }
            }

            function getSavedSort() {
                var savedSort = sessionStorage.getItem(sortKey);
                if (savedSort == null) {
                    return;
                }
                setSelectedSort(savedSort);
            }

            function setSelectedSort(newSort) {
                var foundSort = _.find(constantValues.SORT_OPTIONS,function(oneOption) {
                    return oneOption.key === newSort;
                });
                if (!foundSort) {
                    return;
                }
                saveSort(newSort);
                var fieldToSortBy = foundSort.field;
                var reverse = foundSort.reverse;
                ResourceList.setAllResources(sortList(ResourceList.getAllResources(),fieldToSortBy,reverse));
                ResourceList.setFilteredResources(sortList(ResourceList.getFilteredResources(),fieldToSortBy,reverse));
                ResourceList.setSelectedSort(newSort);
            }

            function sortList(list,fieldToSortBy,reverse) {
                var leveledList = ResourceList.buildCategorizedList(list,0,list.length);
                var newList = [];
                _.each(Object.keys(leveledList), function (key) {
                    var listForThisLevel = _.sortBy(leveledList[key],fieldToSortBy);
                    if (reverse) {
                        listForThisLevel.reverse();
                    }
                    newList = newList.concat(listForThisLevel);
                });
                return newList;
            }

            function getSelectedSort() {
                return ResourceList.getSelectedSort();
            }

            return {
                setSelectedSort: setSelectedSort,
                getSelectedSort: getSelectedSort
            };

    }]);
}());