angular.module('localstorage')
  .factory('storageHelper', function ($cacheFactory, $window) {

    'use strict';

    var memoryStorage = $cacheFactory('XXX');
    var localStorage = $window.localStorage;

    return {
      storage: getStorage()
    };

    function getStorage () {

      if (isLocalStorageSupported()) {
        // return localstorage directly,
        // because chrome does not support method forwarding on localstorage
        return localStorage;

      } else {
        // use memory storage,
        // because safari in private mode does not allow the use of localstorage
        return {
          getItem: memoryStorage.get,
          setItem: memoryStorage.put,
          removeItem: memoryStorage.remove
        };
      }
    }

    function isLocalStorageSupported () {
      try {
        localStorage.setItem('test', 'testValue');
        localStorage.removeItem('test');
        return true;
      } catch (error) {
        return false;
      }
    }

  });