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//
// $Id$
//
// Author: Mathieu Karamitros

// The code is developed in the framework of the ESA AO7146
//
// We would be very happy hearing from you, send us your feedback! :)
//
// In order for Geant4-DNA to be maintained and still open-source,
// article citations are crucial. 
// If you use Geant4-DNA chemistry and you publish papers about your software, 
// in addition to the general paper on Geant4-DNA:
//
// Int. J. Model. Simul. Sci. Comput. 1 (2010) 157–178
//
// we would be very happy if you could please also cite the following
// reference papers on chemistry:
//
// J. Comput. Phys. 274 (2014) 841-882
// Prog. Nucl. Sci. Tec. 2 (2011) 503-508 

#ifndef G4DNAOneStepThermalizationModel_hh
#define G4DNAOneStepThermalizationModel_hh

#include "G4VEmModel.hh"

class G4ITNavigator;
class G4Navigator;

namespace DNA{
  namespace Penetration{
    //-----------------------
    /*
     * Article: Jintana Meesungnoen, Jean-Paul Jay-Gerin,
     *          Abdelali Filali-Mouhim, and Samlee Mankhetkorn (2002)
     *          Low-Energy Electron Penetration Range in Liquid Water.
     *          Radiation Research: November 2002, Vol. 158, No. 5, pp.657-660.
     */
    struct Meesungnoen2002{
      static void GetPenetration(G4double energy,
                                 G4ThreeVector& displacement);
      static double GetRmean(double energy);
      //-----
      // Polynomial fit of Meesungnoen, 2002
      static const double gCoeff[13];
    };
    
    //-----------------------
    /*
     * Article: Terrissol M, Beaudre A (1990) Simulation of space and time 
     *          evolution of radiolytic species induced by electrons in water.
     *          Radiat Prot Dosimetry 31:171–175
     */
    struct Terrisol1990{
      static void GetPenetration(G4double energy,
                                 G4ThreeVector& displacement);
      static double GetRmean(double energy);
      static double Get3DStdDeviation(double energy);
      //-----
      // Terrisol, 1990
      static const double gEnergies_T1990[11];
      static const double gStdDev_T1990[11];
    };
  }
}

/**
 * When an electron reaches the highest energy domain of
 * G4DNAOneStepThermalizationModel,
 * it is then automatically converted into a solvated electron and displace 
 * from its original position using a published thermalization statistic.
 */

template<typename MODEL=DNA::Penetration::Meesungnoen2002>
class G4TDNAOneStepThermalizationModel : public G4VEmModel
{
public:
  typedef MODEL Model;
  G4TDNAOneStepThermalizationModel(const G4ParticleDefinition* p = 0,
                                  const G4String& nam =
                                      "DNAOneStepThermalizationModel");
  virtual ~G4TDNAOneStepThermalizationModel();

  virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);

  virtual G4double CrossSectionPerVolume(const G4Material* material,
                                         const G4ParticleDefinition* p,
                                         G4double ekin,
                                         G4double emin,
                                         G4double emax);

  virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*,
                                 const G4MaterialCutsCouple*,
                                 const G4DynamicParticle*,
                                 G4double tmin,
                                 G4double maxEnergy);

  inline void SetVerbose(int flag){
    fVerboseLevel = flag;
  }
  
  void GetPenetration(G4double energy,
                      G4ThreeVector& displacement);
  
  double GetRmean(double energy);

protected:
  const std::vector<G4double>* fpWaterDensity;
  
  G4ParticleChangeForGamma* fParticleChangeForGamma;
  G4bool fIsInitialised;
  G4int fVerboseLevel;
  G4Navigator* fNavigator;

private:
  G4TDNAOneStepThermalizationModel&
  operator=(const G4TDNAOneStepThermalizationModel &right);
  G4TDNAOneStepThermalizationModel(const G4TDNAOneStepThermalizationModel&);
};

#include "G4DNAOneStepThermalizationModel.hpp"

typedef G4TDNAOneStepThermalizationModel<DNA::Penetration::Meesungnoen2002> G4DNAOneStepThermalizationModel;

// typedef G4TDNAOneStepThermalizationModel<DNA::Penetration::Terrisol1990> G4DNAOneStepThermalizationModel;
// Note: if you use the above distribution, it would be
// better to follow the electrons down to 6 eV and only then apply
// the one step thermalization
#endif
