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#ifndef CLANGCODEMODEL_INTERNAL_CLANGBACKENDIPCINTEGRATION_H
#define CLANGCODEMODEL_INTERNAL_CLANGBACKENDIPCINTEGRATION_H

#include <cpptools/cppprojects.h>

#include <clangbackendipc/connectionclient.h>
#include <clangbackendipc/filecontainer.h>
#include <clangbackendipc/ipcclientinterface.h>
#include <clangbackendipc/projectpartcontainer.h>

#include <QObject>
#include <QSharedPointer>
#include <QVector>

namespace Core {
class IEditor;
class IDocument;
}

namespace TextEditor {
class TextEditorWidget;
}

namespace ClangCodeModel {
namespace Internal {

class ModelManagerSupportClang;

class ClangCompletionAssistProcessor;

class IpcReceiver : public ClangBackEnd::IpcClientInterface
{
public:
    IpcReceiver();
    ~IpcReceiver();

    using AliveHandler = std::function<void ()>;
    void setAliveHandler(const AliveHandler &handler);

    void addExpectedCodeCompletedMessage(quint64 ticket, ClangCompletionAssistProcessor *processor);
    void deleteAndClearWaitingAssistProcessors();
    void deleteProcessorsOfEditorWidget(TextEditor::TextEditorWidget *textEditorWidget);

private:
    void alive() override;
    void echo(const ClangBackEnd::EchoMessage &message) override;
    void codeCompleted(const ClangBackEnd::CodeCompletedMessage &message) override;

    void translationUnitDoesNotExist(const ClangBackEnd::TranslationUnitDoesNotExistMessage &message) override;
    void projectPartsDoNotExist(const ClangBackEnd::ProjectPartsDoNotExistMessage &message) override;

private:
    AliveHandler m_aliveHandler;
    QHash<quint64, ClangCompletionAssistProcessor *> m_assistProcessorsTable;
};

class IpcSenderInterface
{
public:
    virtual ~IpcSenderInterface() {}

    virtual void end() = 0;
    virtual void registerTranslationUnitsForCodeCompletion(const ClangBackEnd::RegisterTranslationUnitForCodeCompletionMessage &message) = 0;
    virtual void unregisterTranslationUnitsForCodeCompletion(const ClangBackEnd::UnregisterTranslationUnitsForCodeCompletionMessage &message) = 0;
    virtual void registerProjectPartsForCodeCompletion(const ClangBackEnd::RegisterProjectPartsForCodeCompletionMessage &message) = 0;
    virtual void unregisterProjectPartsForCodeCompletion(const ClangBackEnd::UnregisterProjectPartsForCodeCompletionMessage &message) = 0;
    virtual void completeCode(const ClangBackEnd::CompleteCodeMessage &message) = 0;
};

class IpcCommunicator : public QObject
{
    Q_OBJECT

public:
    using Ptr = QSharedPointer<IpcCommunicator>;
    using FileContainers = QVector<ClangBackEnd::FileContainer>;
    using ProjectPartContainers = QVector<ClangBackEnd::ProjectPartContainer>;

public:
    IpcCommunicator();

    void registerFilesForCodeCompletion(const FileContainers &fileContainers);
    void unregisterFilesForCodeCompletion(const FileContainers &fileContainers);
    void registerProjectPartsForCodeCompletion(const ProjectPartContainers &projectPartContainers);
    void unregisterProjectPartsForCodeCompletion(const QStringList &projectPartIds);
    void completeCode(ClangCompletionAssistProcessor *assistProcessor, const QString &filePath,
                      quint32 line,
                      quint32 column,
                      const QString &projectFilePath);

    void registerProjectsParts(const QList<CppTools::ProjectPart::Ptr> projectParts);

    void updateUnsavedFileIfNotCurrentDocument(Core::IDocument *document);
    void updateUnsavedFileFromCppEditorDocument(const QString &filePath);
    void updateUnsavedFile(const QString &filePath, const QByteArray &contents);

public: // for tests
    IpcSenderInterface *setIpcSender(IpcSenderInterface *ipcSender);
    void killBackendProcess();

signals: // for tests
    void backendReinitialized();

private:
    enum SendMode { RespectSendRequests, IgnoreSendRequests };

    void initializeBackend();
    void initializeBackendWithCurrentData();
    void registerEmptyProjectForProjectLessFiles();
    void registerCurrentProjectParts();
    void registerCurrentUnsavedFiles();
    void registerCurrrentCodeModelUiHeaders();

    void onBackendRestarted();
    void onEditorAboutToClose(Core::IEditor *editor);
    void onCoreAboutToClose();

    IpcReceiver m_ipcReceiver;
    ClangBackEnd::ConnectionClient m_connection;
    QScopedPointer<IpcSenderInterface> m_ipcSender;

    SendMode m_sendMode = RespectSendRequests;
};

} // namespace Internal
} // namespace ClangCodeModel

#endif // CLANGCODEMODEL_INTERNAL_CLANGBACKENDIPCINTEGRATION_H