handlematrix: fix delete chat error messages

pkg/connector/handlematrix.go

@@ -1104,7 +1104,9 @@ func (t *TelegramClient) HandleMatrixDeleteChat(ctx context.Context, chat *bridg
 			return err
 		}
 	case ids.PeerTypeChat:
-		if chat.Content.DeleteForEveryone {
+		if !chat.Content.DeleteForEveryone {
+			return fmt.Errorf("chats can only be deleted for everyone or left")
+		}
 		result, err := t.client.API().MessagesDeleteChat(ctx, id)
 		if err != nil {
 			return err
@@ -1113,15 +1115,14 @@ func (t *TelegramClient) HandleMatrixDeleteChat(ctx context.Context, chat *bridg
 			return fmt.Errorf("failed to delete chat %d", id)
 		}
 		return nil
-		} else {
-			return fmt.Errorf("deleting chat only supported for group creators")
-		}
 	case ids.PeerTypeChannel:
+		if !chat.Content.DeleteForEveryone {
+			return fmt.Errorf("channels can only be deleted for everyone or left")
+		}
 		accessHash, err := t.ScopedStore.GetAccessHash(ctx, peerType, id)
 		if err != nil {
 			return err
 		}
-		if chat.Content.DeleteForEveryone {
 		if topicID > 0 {
 			_, err = t.client.API().MessagesDeleteTopicHistory(ctx, &tg.MessagesDeleteTopicHistoryRequest{
 				Peer: &tg.InputPeerChannel{
@@ -1140,11 +1141,8 @@ func (t *TelegramClient) HandleMatrixDeleteChat(ctx context.Context, chat *bridg
 			return err
 		}
 		return nil
-		} else {
-			return fmt.Errorf("deleting chat only supported for channel creators")
-		}
 	default:
-		return fmt.Errorf("deleting chat not supported for peer type %s", peerType)
+		return fmt.Errorf("unknown peer type %s", peerType)
 	}
 	return nil
 }