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#ifndef PCHMANAGER_H
#define PCHMANAGER_H

#include "clangprojectsettings.h"
#include "pchinfo.h"

#include <cpptools/cppmodelmanagerinterface.h>
#include <projectexplorer/project.h>
#include <coreplugin/messagemanager.h>

#include <QFutureWatcher>
#include <QHash>
#include <QMutex>
#include <QObject>

namespace ClangCodeModel {
namespace Internal {

class PchManager : public QObject
{
    Q_OBJECT

    typedef CppTools::ProjectPart ProjectPart;

    static PchManager *m_instance;

public:
    PchManager(QObject *parent = 0);
    virtual ~PchManager();

    static PchManager *instance();

    PchInfo::Ptr pchInfo(const ProjectPart::Ptr &projectPart) const;
    ClangProjectSettings *settingsForProject(ProjectExplorer::Project *project);

signals:
    void pchInfoUpdated(); // TODO: check if this is used
    void pchMessage(const QString &message, Core::MessageManager::PrintToOutputPaneFlags flags);

public slots:
    void clangProjectSettingsChanged();
    void onAboutToRemoveProject(ProjectExplorer::Project *project);
    void onProjectPartsUpdated(ProjectExplorer::Project *project);

private slots:
    void updateActivePchFiles();

private:
    struct UpdateParams {
        UpdateParams(const QString &customPchFile, const QList<ProjectPart::Ptr> &projectParts)
            : customPchFile(customPchFile) , projectParts(projectParts) {}
        const QString customPchFile;
        const QList<ProjectPart::Ptr> projectParts;
    };

    void updatePchInfo(ClangProjectSettings *cps,
                       const QList<ProjectPart::Ptr> &projectParts);

    static void doPchInfoUpdateNone(QFutureInterface<void> &future, const UpdateParams params);
    static void doPchInfoUpdateFuzzy(QFutureInterface<void> &future, const UpdateParams params);
    static void doPchInfoUpdateExact(QFutureInterface<void> &future, const UpdateParams params);
    static void doPchInfoUpdateCustom(QFutureInterface<void> &future, const UpdateParams params);

    void setPCHInfo(const QList<ProjectPart::Ptr> &projectParts,
                    const PchInfo::Ptr &pchInfo,
                    const QPair<bool, QStringList> &msgs);
    PchInfo::Ptr findMatchingPCH(const QString &inputFileName, const QStringList &options,
                                 bool fuzzyMatching) const;

private:
    mutable QMutex m_mutex;
    QHash<ProjectPart::Ptr, PchInfo::Ptr> m_activePchFiles;
    QHash<ProjectExplorer::Project *, ClangProjectSettings *> m_projectSettings;
    QFutureWatcher<void> m_pchGenerationWatcher;
};

} // namespace Internal
} // namespace ClangCodeModel

#endif // PCHMANAGER_H