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// Base class for File manager.
//
// Author: Ivana Hrivnacova, 18/06/2013  (ivana@ipno.in2p3.fr)

#ifndef G4VFileManager_h
#define G4VFileManager_h 1

#include "G4BaseFileManager.hh"
#include "G4VTHnFileManager.hh"
#include "globals.hh"

#include <memory>
#include <string_view>

namespace tools {
namespace histo {
class h1d;
class h2d;
class h3d;
class p1d;
class p2d;
}
}

class G4VFileManager : public G4BaseFileManager
{
  public:
    explicit G4VFileManager(const G4AnalysisManagerState& state);
    G4VFileManager() = delete;
    ~G4VFileManager() override = default;

    // Method to open default file
    virtual G4bool OpenFile(const G4String& fileName) = 0;

    // Methods applied to file per name
    virtual G4bool CreateFile(const G4String& fileName) = 0;
    virtual G4bool WriteFile(const G4String& fileName) = 0;
    virtual G4bool CloseFile(const G4String& fileName) = 0;
    virtual G4bool SetIsEmpty(const G4String& fileName, G4bool isEmpty) = 0;

    // Methods applied to all registered files
    virtual G4bool OpenFiles() = 0;
    virtual G4bool WriteFiles() = 0;
    virtual G4bool CloseFiles() = 0;
    virtual G4bool DeleteEmptyFiles() = 0;

    // Clear all data
    virtual void Clear() = 0;

    // Methods for handling files and directories names
    G4bool SetFileName(const G4String& fileName) final;
    virtual G4bool SetHistoDirectoryName(const G4String& dirName);
    virtual G4bool SetNtupleDirectoryName(const G4String& dirName);

    void LockDirectoryNames();
    void UnlockDirectoryNames();

    G4bool IsOpenFile() const;
    G4String GetHistoDirectoryName() const;
    G4String GetNtupleDirectoryName() const;
    G4int GetCycle() const;

    // Access to helpers
    template <typename HT>
    std::shared_ptr<G4VTHnFileManager<HT>> GetHnFileManager() const;

  protected:
    // Static data members
    static constexpr std::string_view fkClass { "G4VFileManager" };

    // Data members
    G4String fHistoDirectoryName;
    G4String fNtupleDirectoryName;
    G4bool   fIsOpenFile { false };
    G4bool   fLockDirectoryNames { false };

    // FileManagers per object type
    std::shared_ptr<G4VTHnFileManager<tools::histo::h1d>> fH1FileManager { nullptr };
    std::shared_ptr<G4VTHnFileManager<tools::histo::h2d>> fH2FileManager { nullptr };
    std::shared_ptr<G4VTHnFileManager<tools::histo::h3d>> fH3FileManager { nullptr };
    std::shared_ptr<G4VTHnFileManager<tools::histo::p1d>> fP1FileManager { nullptr };
    std::shared_ptr<G4VTHnFileManager<tools::histo::p2d>> fP2FileManager { nullptr };
};

// inline functions

inline void G4VFileManager::LockDirectoryNames()
{ fLockDirectoryNames = true; }

inline void G4VFileManager::UnlockDirectoryNames()
{ fLockDirectoryNames = false; }

inline G4bool G4VFileManager::IsOpenFile() const
{ return fIsOpenFile; }

inline G4String G4VFileManager::GetHistoDirectoryName() const
{ return fHistoDirectoryName; }

inline G4String G4VFileManager::GetNtupleDirectoryName() const
{ return fNtupleDirectoryName; }

inline G4int G4VFileManager::GetCycle() const
{ return fState.GetCycle(); }

template <>
inline
std::shared_ptr<G4VTHnFileManager<tools::histo::h1d>>
G4VFileManager::GetHnFileManager<tools::histo::h1d>() const
{   return fH1FileManager; }

template <>
inline
std::shared_ptr<G4VTHnFileManager<tools::histo::h2d>>
G4VFileManager::GetHnFileManager<tools::histo::h2d>() const
{ return fH2FileManager; }

template <>
inline
std::shared_ptr<G4VTHnFileManager<tools::histo::h3d>>
G4VFileManager::GetHnFileManager<tools::histo::h3d>() const
{ return fH3FileManager; }

template <>
inline
std::shared_ptr<G4VTHnFileManager<tools::histo::p1d>>
G4VFileManager::GetHnFileManager<tools::histo::p1d>() const
{ return fP1FileManager; }

template <>
inline
std::shared_ptr<G4VTHnFileManager<tools::histo::p2d>>
G4VFileManager::GetHnFileManager<tools::histo::p2d>() const
{ return fP2FileManager; }

#endif