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// The abstract base class for ntuple file output.
//
// Author: Ivana Hrivnacova, 15/09/2020  (ivana@ipno.in2p3.fr)

#ifndef G4VNtupleFileManager_h
#define G4VNtupleFileManager_h 1

#include "G4AnalysisManagerState.hh"
#include "globals.hh"

#include <memory>
#include <string_view>
#include <utility>

class G4VNtupleManager;
class G4NtupleBookingManager;

enum class G4NtupleMergeMode {
  kNone,
  kMain,
  kSlave
};

class G4VNtupleFileManager
{
  // Disable using the object managers outside G4VAnalysisManager and
  // its messenger
  friend class G4VAnalysisManager;

  public:
    G4VNtupleFileManager(const G4AnalysisManagerState& state, G4String fileType);
    G4VNtupleFileManager() = delete;
    virtual ~G4VNtupleFileManager() = default;

    // deleted copy constructor & assignment operator
    G4VNtupleFileManager(const G4VNtupleFileManager& rhs) = delete;
    G4VNtupleFileManager& operator=(const G4VNtupleFileManager& rhs) = delete;

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

    virtual std::shared_ptr<G4VNtupleManager> CreateNtupleManager() = 0;
    virtual void SetBookingManager(std::shared_ptr<G4NtupleBookingManager> bookingManager);

    // Methods to be performed at file management
    virtual G4bool ActionAtOpenFile(const G4String& /*fileName*/) = 0;
    virtual G4bool ActionAtWrite() = 0;
    virtual G4bool ActionAtCloseFile() = 0;
    virtual G4bool Reset() = 0;
    virtual G4bool IsNtupleMergingSupported() const;
    virtual G4NtupleMergeMode GetMergeMode() const;

    // Get methods
    G4String GetFileType() const;

  protected:
    // Methods for verbose
    void Message(G4int level,
                 const G4String& action,
                 const G4String& objectType,
                 const G4String& objectName = "",
                 G4bool success = true) const;

    // Static data members
    const G4AnalysisManagerState& fState;
    G4String  fFileType;
    std::shared_ptr<G4NtupleBookingManager> fBookingManager { nullptr };

  private:
    // Static data members
    static constexpr std::string_view fkClass { "G4VNtupleFileManager" };
};

// inline functions

inline void G4VNtupleFileManager::SetBookingManager(
  std::shared_ptr<G4NtupleBookingManager> bookingManager)
{
  fBookingManager = std::move(bookingManager);
}

inline G4bool G4VNtupleFileManager::IsNtupleMergingSupported() const {
  return false;
}

inline G4String G4VNtupleFileManager::GetFileType() const {
  return fFileType;
}

inline void G4VNtupleFileManager::Message(
  G4int level, const G4String& action, const G4String& objectType,
  const G4String& objectName, G4bool success) const
{
  fState.Message(level, action, objectType, objectName, success);
}

inline G4NtupleMergeMode G4VNtupleFileManager::GetMergeMode() const {
  return G4NtupleMergeMode::kNone;
}

#endif