export function PhoneNumberDirectiveFactory() {
  return new PhoneNumberDirective();
}

class PhoneNumberDirective implements angular.IDirective {
  require = 'ngModel';
  restrict = 'A';
  link = function (scope, elm, attrs, ctrl) {
    ctrl.$validators.phoneNumber = function (modelValue, viewValue) {
      return PhoneNumberRegex.test(viewValue);
    }
  }
}

const PhoneNumberRegex = /^(\(?44\)? ?|\(?\+\(?44\)? ?|\(?0)(\d\)? ?){9,10}$/