Refactor error handling and move unrelated functions out of ActionsHandler

src/controller.h

@@ -72,6 +72,12 @@ public:
     };
     Q_ENUM(PasswordStatus);
 
+    /// \brief Create new room for a group chat.
+    void createRoom(const QString &name, const QString &topic);
+
+    /// \brief Join a room.
+    void joinRoom(const QString &alias);
+
 private:
     explicit Controller(QObject *parent = nullptr);
     ~Controller() override;
@@ -94,7 +100,14 @@ private Q_SLOTS:
 Q_SIGNALS:
     void busyChanged();
     /// Error occurred because of user inputs
-    void errorOccured(QString error, QString detail);
+    void errorOccured(const QString &error);
+
+    /// \brief Emitted when an action made the user join a room.
+    ///
+    /// Either when a new room was created, a direct chat was started
+    /// or a group chat was joined. The UI will react to this signal
+    /// and switch to the newly joined room.
+    void roomJoined(const QString &roomName);
 
     /// Error occurred because of server or bug in NeoChat
     void globalErrorOccured(QString error, QString detail);