feat: Add session layout

sources/Session/Message.hpp

@@ -0,0 +1,73 @@
+// Copyright (C) 2024-2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <LLMQore/ContentBlocks.hpp>
+
+#include <QString>
+
+#include <memory>
+#include <vector>
+
+namespace QodeAssist {
+
+class Message
+{
+public:
+    enum class Role { System, User, Assistant };
+
+    Message() = default;
+    explicit Message(Role role, QString id = QString())
+        : m_role(role)
+        , m_id(std::move(id))
+    {}
+
+    Message(const Message &) = delete;
+    Message &operator=(const Message &) = delete;
+    Message(Message &&) noexcept = default;
+    Message &operator=(Message &&) noexcept = default;
+    ~Message() = default;
+
+    Role role() const noexcept { return m_role; }
+    const QString &id() const noexcept { return m_id; }
+    void setId(QString id) { m_id = std::move(id); }
+
+    const std::vector<std::unique_ptr<LLMQore::ContentBlock>> &blocks() const noexcept
+    {
+        return m_blocks;
+    }
+
+    void appendBlock(std::unique_ptr<LLMQore::ContentBlock> block)
+    {
+        if (block)
+            m_blocks.push_back(std::move(block));
+    }
+
+    template<typename T>
+    T *lastBlockOfType()
+    {
+        for (auto it = m_blocks.rbegin(); it != m_blocks.rend(); ++it) {
+            if (auto *p = dynamic_cast<T *>(it->get()))
+                return p;
+        }
+        return nullptr;
+    }
+
+    template<typename T>
+    const T *lastBlockOfType() const
+    {
+        return const_cast<Message *>(this)->lastBlockOfType<T>();
+    }
+
+    QString text() const;
+
+    bool hasToolUse() const;
+
+private:
+    Role m_role = Role::User;
+    QString m_id;
+    std::vector<std::unique_ptr<LLMQore::ContentBlock>> m_blocks;
+};
+
+} // namespace QodeAssist