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// The manager class for histogram/profile reading from a Root file.

// Author: Ivana Hrivnacova, 26/08/2021  (ivana@ipno.in2p3.fr)

#ifndef G4RootHnRFileManager_h
#define G4RootHnRFileManager_h 1

#include "G4VTHnRFileManager.hh"

#include <string_view>
#include <tuple>

class G4RootRFileManager;

namespace tools {
namespace rroot {
class buffer;
class TDirectory;
}
}

template <typename HT>
class G4RootHnRFileManager : public G4VTHnRFileManager<HT>
{
  public:
    explicit G4RootHnRFileManager(G4RootRFileManager* rfileManger)
      : G4VTHnRFileManager<HT>(), fRFileManager(rfileManger) {}
    G4RootHnRFileManager() = delete;
    virtual ~G4RootHnRFileManager() = default;

    // Methods for reading objects
    virtual HT* Read(const G4String& htName, const G4String& fileName,
                     const G4String& dirName,  G4bool isUserFileName) final;

  private:
    // Methods
    std::tuple<tools::rroot::buffer*, tools::rroot::TDirectory*> GetBuffer(
                             const G4String& fileName,
                             const G4String& dirName,
                             const G4String& name);
    HT* ReadT(tools::rroot::buffer* buffer);

    // Static data members
    static constexpr std::string_view fkClass { "G4RootHnRFileManager<HT>" };
    // Data members
    G4RootRFileManager* fRFileManager { nullptr };
};

// inline functions

#include "G4RootHnRFileManager.icc"

#endif