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// $Id$
// GEANT4 tag $Name:  $
//

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// Created by Z. Francis

#ifndef G4DNASancheExcitationModel_h
#define G4DNASancheExcitationModel_h 1

#include <deque>
#include <CLHEP/Units/SystemOfUnits.h>

#include "G4VEmModel.hh"
#include "G4ParticleChangeForGamma.hh"
#include "G4Electron.hh"
#include "G4NistManager.hh"

class G4DNASancheExcitationModel : public G4VEmModel
{

public:

  G4DNASancheExcitationModel(const G4ParticleDefinition* p = 0, 
		          const G4String& nam = "DNASancheExcitationModel");

  virtual ~G4DNASancheExcitationModel();

  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);

  // Cross section

  G4double PartialCrossSection(G4double energy,G4int level);

  inline void ExtendLowEnergyLimit (G4double /*threshold*/);		

  inline void SetVerboseLevel(int verbose){verboseLevel = verbose;} 

protected:

  G4ParticleChangeForGamma* fParticleChangeForGamma;

private:
  // Water density table
  const std::vector<G4double>* fpWaterDensity;

  G4double lowEnergyLimit;  
  G4double highEnergyLimit; 
  G4bool isInitialised;
  G4int verboseLevel;
  
  // Cross section

  G4int RandomSelect(G4double energy);
  G4int nLevels;
  G4double VibrationEnergy(G4int level);
  G4double Sum(G4double k);
  G4double LinInterpolate(G4double e1, 
						       G4double e2, 
						       G4double e, 
						       G4double xs1, 
						       G4double xs2);

  //
  typedef std::map<double, std::map<double, double> > TriDimensionMap;
  TriDimensionMap map1;
  std::vector<double> tdummyVec;

  //
  G4DNASancheExcitationModel & operator=(const  G4DNASancheExcitationModel &right);
  G4DNASancheExcitationModel(const  G4DNASancheExcitationModel&);

};

inline void G4DNASancheExcitationModel::ExtendLowEnergyLimit (G4double threshold) 
{ 
    lowEnergyLimit = threshold;
    if (lowEnergyLimit < 2*CLHEP::eV)
     G4Exception ("*** WARNING : the G4DNASancheExcitationModel class is not validated below 2 eV !","",JustWarning,"") ;   
}		 

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#endif