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//
// Author: Mathieu Karamitros (kara@cenbg.in2p3.fr)
//
// WARNING : This class is released as a prototype.
// It might strongly evolve or even disapear in the next releases.
//
// History:
// -----------
// 10 Oct 2011 M.Karamitros created
//
// -------------------------------------------------------------------

#ifndef G4DNACHEMISTRYMANAGER_HH
#define G4DNACHEMISTRYMANAGER_HH

#include "globals.hh"
#include "G4ThreeVector.hh"
#include <fstream>
#include <memory>

class G4Track;
class G4WaterExcitationStructure;
class G4WaterIonisationStructure;

enum ElectronicModification
{
    fIonizedMolecule,
    fExcitedMolecule
};

/**
  * G4DNAChemistryManager is called from the physics models.
  * It creates the water molecules and the solvated electrons and
  * and send them to G4ITStepManager to be treated in the chemistry stage.
  * For this, the fActiveChemistry flag needs to be on.
  * The user can also ask to create a file containing a information about the
  * creation of water molecules and solvated electrons.
  */

class G4DNAChemistryManager
{
public:
    static G4DNAChemistryManager* Instance();

    /**
      * You should rather use DeleteInstance than the destructor of this class
      */
    static void DeleteInstance();

    ~G4DNAChemistryManager();

    /**
      * Tells the chemMan to write into a file
      * the position and electronic state of the water molecule
      * and the position thermalized or not of the solvated electron
      */
    void WriteInto(const G4String&, std::ios_base::openmode mode = std::ios_base::out);

    /** Close the file specified with WriteInto
      */
    void CloseFile();
    inline G4bool IsChemistryActived();
    inline void SetChemistryActivation(G4bool);

    /**
      * Method used by DNA physics model to create a water molecule.
      * The ElectronicModification is a flag telling wheter the molecule
      * is ionized or excited, the electronic level is calculated by the
      * model and the IncomingTrack is the track responsible for the creation
      * of this molecule, for instance an electron.
      */
    void CreateWaterMolecule(ElectronicModification,
                             G4int /*electronicLevel*/,
                             const G4Track* /*theIncomingTrack*/);

    /**
      * On the same idea as the previous method but for solvated electron.
      * This method should be used by the physics model of the ElectronSolvatation
      * process.
      */
    void CreateSolvatedElectron(const G4Track* /*theIncomingTrack*/,
                                G4ThreeVector* finalPosition = 0);

protected :
    G4WaterExcitationStructure* GetExcitationLevel();
    G4WaterIonisationStructure* GetIonisationLevel();

private:
    G4DNAChemistryManager();
    static std::auto_ptr<G4DNAChemistryManager> fInstance;
    bool fActiveChemistry;

    std::ofstream  fOutput;
    G4bool fWriteFile;

    G4WaterExcitationStructure* fExcitationLevel;
    G4WaterIonisationStructure* fIonisationLevel;
};

inline G4bool G4DNAChemistryManager::IsChemistryActived()
{
    return fActiveChemistry;
}

inline void G4DNAChemistryManager::SetChemistryActivation(G4bool flag)
{
    fActiveChemistry = flag;
}

#endif // G4DNACHEMISTRYMANAGER_HH