def otherwise()

in support-frontend/app/utils/CheckoutValidationRules.scala [124:198]
63 lines of code
2 McCabe index (conditional complexity)

    def otherwise(message: String): Result =
      if (isSuccess) Valid else Invalid(message)
  }

}

object SimpleCheckoutFormValidation {

  def passes(createSupportWorkersRequest: CreateSupportWorkersRequest): Result =
    noEmptyNameFields(createSupportWorkersRequest.firstName, createSupportWorkersRequest.lastName) and
      noExcessivelyLongNameFields(createSupportWorkersRequest.firstName, createSupportWorkersRequest.lastName) and
      noFieldsHaveUnsupportedCharacters(createSupportWorkersRequest)

  private def noEmptyNameFields(firstName: String, lastName: String): Result =
    firstName.nonEmpty.otherwise("first name was empty") and
      lastName.nonEmpty.otherwise("last name was empty")

  private def noExcessivelyLongNameFields(firstName: String, lastName: String): Result =
    (firstName.length <= 40).otherwise("first name was longer than 40 chars") and
      (lastName.length <= 80).otherwise("last name was longer than 80 chars")

  def noFieldsHaveUnsupportedCharacters(request: CreateSupportWorkersRequest): Result =
    noFourByteUtf8Characters("firstName", request.firstName) and
      noFourByteUtf8Characters("lastName", request.lastName) and
      request.billingAddress.lineOne.map(noFourByteUtf8Characters("billingAddress.lineOne", _)).getOrElse(Valid) and
      request.billingAddress.lineTwo.map(noFourByteUtf8Characters("billingAddress.lineTwo", _)).getOrElse(Valid) and
      request.billingAddress.city.map(noFourByteUtf8Characters("billingAddress.city", _)).getOrElse(Valid) and
      request.billingAddress.state.map(noFourByteUtf8Characters("billingAddress.state", _)).getOrElse(Valid) and
      request.billingAddress.postCode.map(noFourByteUtf8Characters("billingAddress.postCode", _)).getOrElse(Valid) and
      request.deliveryAddress
        .flatMap(_.lineOne)
        .map(noFourByteUtf8Characters("deliveryAddress.lineOne", _))
        .getOrElse(Valid) and
      request.deliveryAddress
        .flatMap(_.lineTwo)
        .map(noFourByteUtf8Characters("deliveryAddress.lineTwo", _))
        .getOrElse(Valid) and
      request.deliveryAddress
        .flatMap(_.city)
        .map(noFourByteUtf8Characters("deliveryAddress.city", _))
        .getOrElse(Valid) and
      request.deliveryAddress
        .flatMap(_.state)
        .map(noFourByteUtf8Characters("deliveryAddress.state", _))
        .getOrElse(Valid) and
      request.deliveryAddress
        .flatMap(_.postCode)
        .map(noFourByteUtf8Characters("deliveryAddress.postCode", _))
        .getOrElse(Valid) and
      request.giftRecipient
        .map(_.firstName)
        .map(noFourByteUtf8Characters("giftRecipient.firstName", _))
        .getOrElse(Valid) and
      request.giftRecipient
        .map(_.lastName)
        .map(noFourByteUtf8Characters("giftRecipient.lastName", _))
        .getOrElse(Valid) and
      request.giftRecipient
        .flatMap(_.email)
        .map(noFourByteUtf8Characters("giftRecipient.email", _))
        .getOrElse(Valid) and
      request.giftRecipient
        .flatMap(_.message)
        .map(noFourByteUtf8Characters("giftRecipient.message", _))
        .getOrElse(Valid) and
      noFourByteUtf8Characters("email", request.email) and
      request.telephoneNumber.map(noFourByteUtf8Characters("telephoneNumber", _)).getOrElse(Valid) and
      request.deliveryInstructions.map(noFourByteUtf8Characters("deliveryInstructions", _)).getOrElse(Valid)

  /** Fail validation for characters that Zuora doesn’t support.
    *
    * Zuora’s subscribe endpoint breaks when it receives characters that require more than 3 bytes to represent in UTF-8
    * (which is the required encoding for JSON). Those characters are those above U+FFFF.
    */
  def noFourByteUtf8Characters(name: String, string: String): Result = {