class UserWrapper(object):
    _user_model_cache = None
    
    def _get_model(self):
        if self._user_model_cache is None:
            from django.conf import settings
                
            if not getattr(settings, 'AUTH_USER_MODEL', False):
                self._user_model_cache = BaseUser
            else:
                try:
                    app_label, model_name = settings.AUTH_USER_MODEL.split('.')
                    self._user_model_cache = models.get_model(app_label, model_name)
                except (ImportError):
                    # TODO: Error logging
                    raise Exception("Big badaboom")
    
        return self._user_model_cache

    def __getattr__(self, name):
        return getattr(self._get_model(), name)
        
    def __call__(self, *args, **kwargs):
        return self._get_model()(*args, **kwargs)