// SetCondition adds/replaces the given condition in the replication controller status.
func SetCondition(status *v1.ReplicationControllerStatus, condition v1.ReplicationControllerCondition) {
	currentCond := GetCondition(*status, condition.Type)
	if currentCond != nil && currentCond.Status == condition.Status && currentCond.Reason == condition.Reason {
		return
	}
	newConditions := filterOutCondition(status.Conditions, condition.Type)
	status.Conditions = append(newConditions, condition)
}

// updateReplicationControllerStatus attempts to update the Status.Replicas of the given controller, with a single GET/PUT retry.
func updateReplicationControllerStatus(c v1core.ReplicationControllerInterface, rc v1.ReplicationController, newStatus v1.ReplicationControllerStatus) (updateErr error) {
	// This is the steady state. It happens when the rc doesn't have any expectations, since
	// we do a periodic relist every 30s. If the generations differ but the replicas are
	// the same, a caller might've resized to the same replica count.
	if rc.Status.Replicas == newStatus.Replicas &&
		rc.Status.FullyLabeledReplicas == newStatus.FullyLabeledReplicas &&
		rc.Status.ReadyReplicas == newStatus.ReadyReplicas &&
		rc.Status.AvailableReplicas == newStatus.AvailableReplicas &&
		rc.Generation == rc.Status.ObservedGeneration &&
		reflect.DeepEqual(rc.Status.Conditions, newStatus.Conditions) {
		return nil
	}
	// Save the generation number we acted on, otherwise we might wrongfully indicate
	// that we've seen a spec update when we retry.
	// TODO: This can clobber an update if we allow multiple agents to write to the
	// same status.
	newStatus.ObservedGeneration = rc.Generation

	var getErr error
	for i, rc := 0, &rc; ; i++ {
		glog.V(4).Infof(fmt.Sprintf("Updating replica count for rc: %s/%s, ", rc.Namespace, rc.Name) +
			fmt.Sprintf("replicas %d->%d (need %d), ", rc.Status.Replicas, newStatus.Replicas, *(rc.Spec.Replicas)) +
			fmt.Sprintf("fullyLabeledReplicas %d->%d, ", rc.Status.FullyLabeledReplicas, newStatus.FullyLabeledReplicas) +
			fmt.Sprintf("readyReplicas %d->%d, ", rc.Status.ReadyReplicas, newStatus.ReadyReplicas) +
			fmt.Sprintf("availableReplicas %d->%d, ", rc.Status.AvailableReplicas, newStatus.AvailableReplicas) +
			fmt.Sprintf("sequence No: %v->%v", rc.Status.ObservedGeneration, newStatus.ObservedGeneration))

		rc.Status = newStatus
		_, updateErr = c.UpdateStatus(rc)
		if updateErr == nil || i >= statusUpdateRetries {
			return updateErr
		}
		// Update the controller with the latest resource version for the next poll
		if rc, getErr = c.Get(rc.Name); getErr != nil {
			// If the GET fails we can't trust status.Replicas anymore. This error
			// is bound to be more interesting than the update failure.
			return getErr
		}
	}
}

// RemoveCondition removes the condition with the provided type from the replication controller status.
func RemoveCondition(status *v1.ReplicationControllerStatus, condType v1.ReplicationControllerConditionType) {
	status.Conditions = filterOutCondition(status.Conditions, condType)
}