feat: add support code completion via acp

sources/completion/CodeCompletionController.hpp

@@ -0,0 +1,98 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// Copyright (C) 2024-2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Additional attribution terms under GPLv3 §7(b) apply — see LICENSE
+
+#pragma once
+
+#include <QElapsedTimer>
+#include <QHash>
+#include <QObject>
+#include <QPointer>
+
+#include <texteditor/textdocument.h>
+#include <texteditor/texteditor.h>
+
+#include "completion/CompletionEngine.hpp"
+#include "context/ContextManager.hpp"
+#include "refactor/QuickRefactorHandler.hpp"
+#include "refactor/RefactorSuggestionHoverHandler.hpp"
+#include "widgets/CompletionErrorHandler.hpp"
+#include "widgets/CompletionProgressHandler.hpp"
+#include "widgets/RefactorWidgetHandler.hpp"
+
+namespace QodeAssist {
+
+class CodeCompletionController : public QObject
+{
+    Q_OBJECT
+
+public:
+    CodeCompletionController(
+        CompletionEngine *fimEngine,
+        CompletionEngine *agenticEngine,
+        CompletionEngine *acpEngine,
+        Context::ContextManager &contextManager,
+        QObject *parent = nullptr);
+    ~CodeCompletionController() override;
+
+    void requestCompletions(TextEditor::TextEditorWidget *editor);
+    void requestQuickRefactor(
+        TextEditor::TextEditorWidget *editor, const QString &instructions = QString());
+
+protected:
+    bool eventFilter(QObject *watched, QEvent *event) override;
+
+private:
+    struct RunningRequest
+    {
+        quint64 id = 0;
+        int position = -1;
+        CompletionEngine *engine = nullptr;
+    };
+
+    void openDocument(TextEditor::TextDocument *document);
+    void closeDocument(TextEditor::TextDocument *document);
+    void scheduleRequest(TextEditor::TextEditorWidget *editor);
+    void handleCompletionReady(quint64 requestId, const QString &text);
+    void handleCompletionFailed(quint64 requestId, const QString &error);
+    void applyCompletion(
+        TextEditor::TextEditorWidget *editor, const QString &text, int requestPosition);
+    void cancelRunningRequest(TextEditor::TextEditorWidget *editor);
+    void dropRunningRequestById(quint64 requestId);
+    bool isEnabled(ProjectExplorer::Project *project) const;
+    CompletionEngine *activeEngine() const;
+
+    void setupConnections();
+    void cleanupConnections();
+    void handleRefactoringResult(const RefactorResult &result);
+    void displayRefactoringSuggestion(const RefactorResult &result);
+    void displayRefactoringWidget(const RefactorResult &result);
+    void applyRefactoringEdit(
+        TextEditor::TextEditorWidget *editor, const Utils::Text::Range &range, const QString &text);
+
+    void handleAutoRequestTrigger(TextEditor::TextEditorWidget *widget);
+
+    CompletionEngine *m_fimEngine = nullptr;
+    CompletionEngine *m_agenticEngine = nullptr;
+    CompletionEngine *m_acpEngine = nullptr;
+    Context::ContextManager &m_contextManager;
+    quint64 m_lastRequestId = 0;
+    QHash<TextEditor::TextEditorWidget *, RunningRequest> m_runningRequests;
+    QHash<quint64, QPointer<TextEditor::TextEditorWidget>> m_requestEditors;
+    QHash<TextEditor::TextEditorWidget *, QTimer *> m_scheduledRequests;
+    QHash<TextEditor::TextDocument *, QMetaObject::Connection> m_documentConnections;
+    QList<QPointer<TextEditor::TextEditorWidget>> m_hoverHandlerWidgets;
+    QMetaObject::Connection m_documentOpenedConnection;
+    QMetaObject::Connection m_documentClosedConnection;
+
+    QElapsedTimer m_typingTimer;
+    int m_recentCharCount;
+    CompletionProgressHandler m_progressHandler;
+    CompletionErrorHandler m_errorHandler;
+    QuickRefactorHandler *m_refactorHandler{nullptr};
+    RefactorSuggestionHoverHandler *m_refactorHoverHandler{nullptr};
+    RefactorWidgetHandler *m_refactorWidgetHandler{nullptr};
+};
+
+} // namespace QodeAssist