Add basic chat widgets and functionality

chat/ChatWidget.h

@@ -0,0 +1,62 @@
+/* 
+ * Copyright (C) 2024 Petr Mironychev
+ *
+ * This file is part of QodeAssist.
+ *
+ * QodeAssist is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * QodeAssist is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with QodeAssist. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <QLineEdit>
+#include <QPushButton>
+#include <QTextEdit>
+#include <QWidget>
+
+#include "ChatClientInterface.hpp"
+
+namespace QodeAssist::Chat {
+
+class ChatWidget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit ChatWidget(QWidget *parent = nullptr);
+
+    void clear();
+    void scrollToBottom();
+    void setShowTimestamp(bool show);
+
+    void receiveMessage(const QString &message);
+private slots:
+    void sendMessage();
+    void receivePartialMessage(const QString &partialMessage);
+    void onMessageCompleted();
+    void handleError(const QString &error);
+
+private:
+    QTextEdit *m_chatDisplay;
+    QLineEdit *m_messageInput;
+    QPushButton *m_sendButton;
+    bool m_showTimestamp;
+    ChatClientInterface *m_chatClient;
+    QString m_currentAIResponse;
+
+    void setupUi();
+    void addMessage(const QString &message, bool fromUser = true);
+    void updateLastAIMessage(const QString &message);
+};
+
+} // namespace QodeAssist::Chat