podautoscaler

type AutoScaler interface {
	// ComputeDesiredReplicas performs metric-based scaling calculation.
	// This is the primary method for scaling decisions and returns only the recommendation.
	// It does NOT perform any actual scaling operations.
	// All per-PA configuration is extracted from the PodAutoscaler spec on each call.
	ComputeDesiredReplicas(ctx context.Context, request ReplicaComputeRequest) (*ReplicaComputeResult, error)
}

type DefaultAutoScaler struct {
	// contains filtered or unexported fields
}

type PodAutoscalerReconciler struct {
	client.Client
	Scheme        *runtime.Scheme
	EventRecorder record.EventRecorder
	Mapper        apimeta.RESTMapper

	RuntimeConfig config.RuntimeConfig
	// contains filtered or unexported fields
}

type ReplicaComputeRequest struct {
	PodAutoscaler   autoscalingv1alpha1.PodAutoscaler
	ScalingContext  scalingctx.ScalingContext // Single source of truth for PA-level configuration
	CurrentReplicas int32
	Pods            []corev1.Pod
	Timestamp       time.Time
}

type ReplicaComputeResult struct {
	DesiredReplicas int32
	Algorithm       string
	Reason          string
	Valid           bool
}

type ScaleDecision struct {
	DesiredReplicas int32
	ShouldScale     bool
	Reason          string
	Algorithm       string
}

type ScalingTargetKey struct {
	Namespace     string
	APIVersion    string
	Kind          string
	Name          string
	SubTargetRole string // from SubTargetSelector.RoleName
}

type ValidationResult struct {
	Valid   bool
	Reason  string
	Message string
}

type WorkloadScale interface {
	// Validate checks if the target is valid and scalable
	Validate(ctx context.Context, pa *autoscalingv1alpha1.PodAutoscaler) error

	// GetCurrentReplicasFromScale extracts the current replica count from a scale object
	GetCurrentReplicasFromScale(ctx context.Context, pa *autoscalingv1alpha1.PodAutoscaler, scale *unstructured.Unstructured) (int32, error)

	// SetDesiredReplicas updates the replica count
	SetDesiredReplicas(ctx context.Context, pa *autoscalingv1alpha1.PodAutoscaler, replicas int32) error

	// GetPodSelectorFromScale extracts the label selector from an existing scale object
	// For role-level scaling, it adds the role label requirement
	// This avoids re-fetching the scale object when the controller already has it
	GetPodSelectorFromScale(ctx context.Context, pa *autoscalingv1alpha1.PodAutoscaler, scale *unstructured.Unstructured) (labels.Selector, error)
}