(function(){
    "use strict";

    angular.module("raz")
        .service("lcmStateSelectorService", ["$window", "stateStandardsStates", function($window, stateStandardsStates){

            var curState = null;
            var storageKey = 'lcm-state-selector';
            var subscribers = [];
            var hasSelected = false;

            function fromStorage() {
                return $window.sessionStorage.getItem(storageKey);
            }

            function toStorage() {
                $window.sessionStorage.setItem(storageKey, toString());
            }

            function toString() {
                return curState.state_id;
            }

            function indexOfStateById(state) {
                if (angular.isArray(stateStandardsStates)) {
                    for (var idx = 0; idx < stateStandardsStates.length; ++idx) {
                        if (stateStandardsStates[idx].state_id == state.state_id) {
                            return idx;
                        }
                    }
                }
                return -1;
            }

            function getStateFromId(stateId) {
                var idx = indexOfStateById({state_id: stateId});
                return idx >= 0 ? stateStandardsStates[idx] : undefined;
            }

            function initFromSession() {
                var storageValue = fromStorage();
                if (storageValue !== null) {
                    selectState(getStateFromId(storageValue));
                }
            }

            function getTitle() {
                if (hasSelected) {
                    return curState.state_name;
                }
                return "Select State";
            }

            function isStateSelected(state) {
                if (hasSelected) {
                    return state.state_id == curState.state_id;
                }
                return false;
            }

            function isFiltering() {
                return hasSelected;
            }

            function selectState(state) {
                curState = state;
                hasSelected = true;
                toStorage();
                notifySubscribers();
            }

            function getSelectedState() {
                return curState;
            }

            function onUpdate(callback) {
                subscribers.push(callback);
            }

            function notifySubscribers() {
                for (var i = 0; i < subscribers.length; i++) {
                    subscribers[i](curState);
                }
            }

            initFromSession();

            return {
                isFiltering: isFiltering,
                isStateSelected: isStateSelected,
                getTitle: getTitle,
                selectState: selectState,
                getSelectedState: getSelectedState,
                onUpdate: onUpdate
            };

        }]);

})();