Expression        *string          `json:"expression,omitempty"`
	Message           *string          `json:"message,omitempty"`
	Reason            *v1.StatusReason `json:"reason,omitempty"`
	MessageExpression *string          `json:"messageExpression,omitempty"`
}

// ValidationApplyConfiguration constructs an declarative configuration of the Validation type for use with
// apply.
func Validation() *ValidationApplyConfiguration {

type ValidationRuleApplyConfiguration struct {
	Rule              *string                        `json:"rule,omitempty"`
	Message           *string                        `json:"message,omitempty"`
	MessageExpression *string                        `json:"messageExpression,omitempty"`
	Reason            *v1beta1.FieldValueErrorReason `json:"reason,omitempty"`
	FieldPath         *string                        `json:"fieldPath,omitempty"`

	Expression        *string          `json:"expression,omitempty"`
	Message           *string          `json:"message,omitempty"`
	Reason            *v1.StatusReason `json:"reason,omitempty"`
	MessageExpression *string          `json:"messageExpression,omitempty"`
}

// ValidationApplyConfiguration constructs an declarative configuration of the Validation type for use with
// apply.
func Validation() *ValidationApplyConfiguration {

	Expression        *string          `json:"expression,omitempty"`
	Message           *string          `json:"message,omitempty"`
	Reason            *v1.StatusReason `json:"reason,omitempty"`
	MessageExpression *string          `json:"messageExpression,omitempty"`
}

// ValidationApplyConfiguration constructs an declarative configuration of the Validation type for use with
// apply.
func Validation() *ValidationApplyConfiguration {

type ValidationRuleApplyConfiguration struct {
	Rule              *string                   `json:"rule,omitempty"`
	Message           *string                   `json:"message,omitempty"`
	MessageExpression *string                   `json:"messageExpression,omitempty"`
	Reason            *v1.FieldValueErrorReason `json:"reason,omitempty"`
	FieldPath         *string                   `json:"fieldPath,omitempty"`

	"k8s.io/apiserver/pkg/admission/plugin/cel"
)

var _ cel.ExpressionAccessor = (*MessageExpressionCondition)(nil)

type MessageExpressionCondition struct {
	MessageExpression string
}

func (m *MessageExpressionCondition) GetExpression() string {
	return m.MessageExpression
}

func (m *MessageExpressionCondition) ReturnTypes() []*celgo.Type {
	return []*celgo.Type{celgo.StringType}

						message = ""
					}
				}
			}
			if messageResult != nil && messageResult.Error != nil {
				// log any error with messageExpression
				klog.V(2).ErrorS(messageResult.Error, "error while evaluating messageExpression")
			}
			// fallback to set message to the custom message
			if message == "" && len(validation.Message) > 0 {
				message = strings.TrimSpace(validation.Message)
			}

type StructuralValidationRule struct {
	rule, message, messageExpression, fieldPath string
}

func (s *StructuralValidationRule) Rule() string {
	return s.rule
}
func (s *StructuralValidationRule) Message() string {
	return s.message
}
func (s *StructuralValidationRule) FieldPath() string {
	return s.fieldPath
}
func (s *StructuralValidationRule) MessageExpression() string {
	return s.messageExpression
}

	MessageExpressionField string `json:"messageExpression"`
	PathField              string `json:"fieldPath"`
}

func (v ValidationRule) Rule() string {
	return v.RuleField
}

func (v ValidationRule) Message() string {
	return v.MessageField
}

func (v ValidationRule) FieldPath() string {
	return v.PathField
}

func (v ValidationRule) MessageExpression() string {
	return v.MessageExpressionField
}

	celExpressionAccessor := make([]cel.ExpressionAccessor, len(inputValidations))
	for i, validation := range inputValidations {
		if validation.MessageExpression != "" {
			condition := MessageExpressionCondition{
				MessageExpression: validation.MessageExpression,
			}
			celExpressionAccessor[i] = &condition
		}
	}
	return celExpressionAccessor
}