fix: fix new sdk builder adjustment

stackit/internal/wait/postgresflexalpha/wait.go

@@ -25,6 +25,7 @@ const (
 	InstanceStateTerminating = "TERMINATING"
 	InstanceStateUnknown     = "UNKNOWN"
 	InstanceStatePending     = "PENDING"
+	InstanceStateDeleted     = "DELETED"
 )
 
 // APIClientInstanceInterface Interface needed for tests
@@ -296,3 +297,44 @@ func GetDatabaseByIdWaitHandler(
 	)
 	return handler
 }
+
+func DeleteInstanceWaitHandler(
+	ctx context.Context,
+	a APIClientInstanceInterface,
+	projectId,
+	region,
+	instanceId string,
+	timeout, sleepBeforeWait time.Duration,
+) error {
+	handler := wait.New(
+		func() (waitFinished bool, response *postgresflex.GetInstanceResponse, err error) {
+			s, err := a.GetInstanceRequestExecute(ctx, projectId, region, instanceId)
+			if err != nil {
+				oapiErr, ok := err.(*oapierror.GenericOpenAPIError) // nolint:errorlint //complaining that error.As should be used to catch wrapped errors, but this error should not be wrapped
+				if !ok {
+					return false, nil, fmt.Errorf("received error is no oapierror: %w", err)
+				}
+				if oapiErr.StatusCode == 404 {
+					return true, nil, nil
+				}
+				return false, nil, fmt.Errorf("api returned error: %w", err)
+			}
+			switch *s.Status {
+			case InstanceStateDeleted:
+				return true, nil, nil
+			case InstanceStateEmpty, InstanceStatePending, InstanceStateUnknown, InstanceStateProgressing, InstanceStateSuccess:
+				return false, nil, nil
+			case InstanceStateFailed:
+				return true, nil, fmt.Errorf("wait handler got status FAILURE for instance: %s", instanceId)
+			default:
+				return true, s, fmt.Errorf("instance with id %s has unexpected status %s", instanceId, *s.Status)
+			}
+		},
+	).SetTimeout(timeout).SetSleepBeforeWait(sleepBeforeWait)
+
+	_, err := handler.WaitWithContext(ctx)
+	if err != nil {
+		return err
+	}
+	return nil
+}