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 {

	MaxCardinality uint64
	// MessageExpression represents the cel Program that should be evaluated to generate an error message if the rule
	// fails to validate. If no MessageExpression was given, or if this expression failed to compile, this will be nil.
	MessageExpression cel.Program
	// MessageExpressionError represents an error encountered during compilation of MessageExpression. If no error was
	// encountered, this will be nil.

	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"`

	Message string
	// MessageExpression declares a CEL expression that evaluates to the validation failure message that is returned when this rule fails.
	// Since messageExpression is used as a failure message, it must evaluate to a string.
	// If both message and messageExpression are present on a rule, then messageExpression will be used if validation

	"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)
			}

					Action: AuditAnnotationActionExclude, // TODO: is this right?
					Error:  "valueExpression ''this is not valid CEL' resulted in error: <nil>",
				},
			},
			failPolicy: &ignore,
		},
		{
			name: "messageExpression successful, empty message",
			evaluations: []cel.EvaluationResult{
				{
					EvalResult: celtypes.False,
					ExpressionAccessor: &ValidationCondition{
						Reason:     &forbiddenReason,