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// $Id$
//
// Author: Luciano Pandola
//
// History:
// -----------
// 13 Jan 2010   L. Pandola  First implementation
// 24 May 2011   L. Pandola  Renamed (make v2008 as default Penelope)
//
// -------------------------------------------------------------------
//
// Class description:
// Low Energy Electromagnetic Physics, Gamma Conversion 
// with Penelope Model, version 2008
// -------------------------------------------------------------------

#ifndef G4PENELOPEGAMMACONVERSIONMODEL_HH
#define G4PENELOPEGAMMACONVERSIONMODEL_HH 1

#include "globals.hh"
#include "G4VEmModel.hh"
#include "G4DataVector.hh"
#include "G4ParticleChangeForGamma.hh"

class G4ParticleDefinition;
class G4DynamicParticle;
class G4MaterialCutsCouple;
class G4Material;
class G4PhysicsFreeVector;

class G4PenelopeGammaConversionModel : public G4VEmModel 
{

public:
  
  G4PenelopeGammaConversionModel(const G4ParticleDefinition* p=0,
				 const G4String& processName ="PenConversion");
  
  virtual ~G4PenelopeGammaConversionModel();

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

  virtual G4double ComputeCrossSectionPerAtom(
					      const G4ParticleDefinition*,
					      G4double kinEnergy,
					      G4double Z,
					      G4double A=0,
					      G4double cut=0,
					      G4double emax=DBL_MAX);

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

  void SetVerbosityLevel(G4int lev){verboseLevel = lev;};
  G4int GetVerbosityLevel(){return verboseLevel;};

protected:
  G4ParticleChangeForGamma* fParticleChange;

private:
  G4PenelopeGammaConversionModel & operator=(const 
					       G4PenelopeGammaConversionModel &right);
  G4PenelopeGammaConversionModel(const G4PenelopeGammaConversionModel&);


  //Intrinsic energy limits of the model: cannot be extended by the parent process
  G4double fIntrinsicLowEnergyLimit;
  G4double fIntrinsicHighEnergyLimit;

  //Use a quicker sampling algorithm if E < smallEnergy
  G4double fSmallEnergy; 

  std::map<G4int,G4PhysicsFreeVector*> *logAtomicCrossSection;
  void ReadDataFile(const G4int Z);

  void InitializeScreeningRadii();
  G4double fAtomicScreeningRadius[99];

  void InitializeScreeningFunctions(const G4Material*);
  //Effective (scalar) properties attached to materials:
  // effective charge
  std::map<const G4Material*,G4double> *fEffectiveCharge;
  // 2/Rs (Rs = screening radius), BCB array in Penelope
  std::map<const G4Material*,G4double> *fMaterialInvScreeningRadius;
  // Parameters of screening functions
  std::map<const G4Material*,std::pair<G4double,G4double> > *fScreeningFunction;

  std::pair<G4double,G4double> GetScreeningFunctions(G4double);	


  G4int verboseLevel;
  G4bool isInitialised;
};

#endif