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// Manager class for ntuple Root file output,
// provides handling Root ntuple managers in parallel processing.

// Author: Ivana Hrivnacova, 18/06/2013  (ivana@ipno.in2p3.fr)

#ifndef G4RootNtupleFileManager_h
#define G4RootNtupleFileManager_h 1

#include "G4VNtupleFileManager.hh"

#include <string_view>

class G4RootFileManager;
class G4RootNtupleManager;
class G4RootPNtupleManager;
class G4VNtupleManager;
class G4NtupleBookingManager;

enum class G4NtupleMergeMode {
  kNone,
  kMain,
  kSlave
};

class G4RootNtupleFileManager : public G4VNtupleFileManager
{
  friend class G4RootMpiNtupleFileManager;

  public:
    explicit G4RootNtupleFileManager(const G4AnalysisManagerState& state);
    G4RootNtupleFileManager() = delete;
    virtual ~G4RootNtupleFileManager();

    // MT/MPI
    virtual void SetNtupleMerging(G4bool mergeNtuples,
                   G4int nofReducedNtupleFiles = 0) override;
    virtual void SetNtupleRowWise(G4bool rowWise, G4bool rowMode = true) override;
    virtual void SetBasketSize(unsigned int basketSize) override;
    virtual void SetBasketEntries(unsigned int basketEntries) override;

    // virtual methods from base class
    virtual G4bool ActionAtOpenFile(const G4String& fileName) override;
    virtual G4bool ActionAtWrite() override;
    virtual G4bool ActionAtCloseFile(G4bool reset) override;
    virtual G4bool Reset() override;
    virtual G4bool IsNtupleMergingSupported() const override;

    virtual std::shared_ptr<G4VNtupleManager> CreateNtupleManager() override;

    void SetFileManager(std::shared_ptr<G4RootFileManager> fileManager);

    G4NtupleMergeMode GetMergeMode() const;
    std::shared_ptr<G4RootNtupleManager> GetNtupleManager() const;

  private:
    // Static data members
    static G4RootNtupleFileManager* fgMasterInstance;

    void  SetNtupleMergingMode(G4bool mergeNtuples, G4int nofNtupleFiles);
    G4int GetNtupleFileNumber();
    G4bool CloseNtupleFiles();

    // Static data members
    static constexpr std::string_view fkClass { "G4RootNtupleFileManager" };

    // data members
    G4bool  fIsInitialized { false };
    G4int   fNofNtupleFiles { 0 };
    G4bool  fNtupleRowWise { false };
    G4bool  fNtupleRowMode { true };
    G4NtupleMergeMode  fNtupleMergeMode { G4NtupleMergeMode::kNone };
    std::shared_ptr<G4RootNtupleManager>  fNtupleManager { nullptr };
    std::shared_ptr<G4RootPNtupleManager> fSlaveNtupleManager { nullptr };
    std::shared_ptr<G4RootFileManager>    fFileManager { nullptr };
};

inline void G4RootNtupleFileManager::SetFileManager(
  std::shared_ptr<G4RootFileManager> fileManager)
{ fFileManager = fileManager; }

inline G4NtupleMergeMode G4RootNtupleFileManager::GetMergeMode() const
{ return fNtupleMergeMode; }

inline G4bool G4RootNtupleFileManager::IsNtupleMergingSupported() const
{ return true; }

inline std::shared_ptr<G4RootNtupleManager> G4RootNtupleFileManager::GetNtupleManager() const
{ return fNtupleManager; }

#endif