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// $Id$
//

#ifndef G4DNAChampionElasticModel_h
#define G4DNAChampionElasticModel_h 1

#include <map>
#include "G4DNACrossSectionDataSet.hh"
#include "G4VEmModel.hh"
#include "G4Electron.hh"
#include "G4ParticleChangeForGamma.hh"
#include "G4LogLogInterpolation.hh"
#include "G4ProductionCutsTable.hh"
#include "G4NistManager.hh"

class G4DNAChampionElasticModel : public G4VEmModel
{

public:

  G4DNAChampionElasticModel(const G4ParticleDefinition* p = 0, 
		            const G4String& nam = "DNAChampionElasticModel");

  virtual ~G4DNAChampionElasticModel();

  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 SetKillBelowThreshold (G4double threshold);		 
  G4double GetKillBelowThreshold () { return killBelowEnergy; }		 

protected:

  G4ParticleChangeForGamma* fParticleChangeForGamma;

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

  G4double killBelowEnergy;  
  G4double lowEnergyLimit;  
  G4double highEnergyLimit; 
  G4bool isInitialised;
  G4int verboseLevel;
  
  // Cross section
  
  typedef std::map<G4String,G4String,std::less<G4String> > MapFile;
  MapFile tableFile;

  typedef std::map<G4String,G4DNACrossSectionDataSet*,std::less<G4String> > MapData;
  MapData tableData;
  
  // Final state

  //G4double DifferentialCrossSection(G4ParticleDefinition * aParticleDefinition, G4double k, G4double theta);

  G4double Theta(G4ParticleDefinition * aParticleDefinition, G4double k, G4double integrDiff);
  
  G4double LinLinInterpolate(G4double e1, G4double e2, G4double e, G4double xs1, G4double xs2);

  G4double LinLogInterpolate(G4double e1, G4double e2, G4double e, G4double xs1, G4double xs2);
   
  G4double LogLogInterpolate(G4double e1, G4double e2, G4double e, G4double xs1, G4double xs2);
   
  G4double QuadInterpolator(G4double e11, 
 		            G4double e12, 
			    G4double e21, 
			    G4double e22, 
			    G4double x11,
			    G4double x12, 
			    G4double x21, 
			    G4double x22, 
			    G4double t1, 
			    G4double t2, 
			    G4double t, 
			    G4double e);

  typedef std::map<double, std::map<double, double> > TriDimensionMap;

  TriDimensionMap eDiffCrossSectionData;
  std::vector<double> eTdummyVec;

  typedef std::map<double, std::vector<double> > VecMap;
  VecMap eVecm;
   
  G4double RandomizeCosTheta(G4double k);
   
  //
   
  G4DNAChampionElasticModel & operator=(const  G4DNAChampionElasticModel &right);
  G4DNAChampionElasticModel(const  G4DNAChampionElasticModel&);

};


inline void G4DNAChampionElasticModel::SetKillBelowThreshold (G4double /*threshold*/) 
{ 

// SI - commented on 19/06/2013
/*
  killBelowEnergy = threshold; 
    
  if (threshold < 1*eV)
     G4Exception ("*** WARNING : the G4DNAChampionElasticModel class is not validated below 1 eV !","",JustWarning,"") ;

  if (threshold < 0.025*eV) threshold = 0.025*eV;
*/

  G4Exception ("*** WARNING : G4DNAChampionElasticModel::SetKillBelowThreshold INACTIVE for now","",JustWarning,"") ;
            
}		 

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

#endif