public virtual ActionResult Index(LoginModel model)
        {
            if (ModelState.IsValid)
            {
                model.Username = model.Username.Trim();

                var loginResult = _customerRegistrationService.ValidateCustomer(model.Username, model.Password);

                switch (loginResult)
                {
                    case CustomerLoginResults.Successful:
                        {
                            var customer = model.Username.Contains("@") ?
                                _customerService.GetCustomerByEmail(model.Username) :
                                _customerService.GetCustomerByUsername(model.Username);

                            if (customer.IsAdmin())
                            {
                                _authenticationService.SignIn(customer, model.RememberMe);
                                return Redirect("~/Admin");
                            }
                            break;
                        }
                    case CustomerLoginResults.CustomerNotExist:
                        ModelState.AddModelError("", _localizationService.GetResource("Account.Login.WrongCredentials.CustomerNotExist"));
                        break;
                    case CustomerLoginResults.Deleted:
                        ModelState.AddModelError("", _localizationService.GetResource("Account.Login.WrongCredentials.Deleted"));
                        break;
                    case CustomerLoginResults.NotActive:
                        ModelState.AddModelError("", _localizationService.GetResource("Account.Login.WrongCredentials.NotActive"));
                        break;
                    case CustomerLoginResults.NotRegistered:
                        ModelState.AddModelError("", _localizationService.GetResource("Account.Login.WrongCredentials.NotRegistered"));
                        break;
                    case CustomerLoginResults.LockedOut:
                        ModelState.AddModelError("", _localizationService.GetResource("Account.Login.WrongCredentials.LockedOut"));
                        break;
                    case CustomerLoginResults.WrongPassword:
                    default:
                        ModelState.AddModelError("", _localizationService.GetResource("Account.Login.WrongCredentials"));
                        break;
                }
            }
            return View(model);
        }