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#ifndef G4DNADingfelderChargeDecreaseModel_h
#define G4DNADingfelderChargeDecreaseModel_h 1

#include "G4VEmModel.hh"
#include "G4ParticleChangeForGamma.hh"
#include "G4ProductionCutsTable.hh"

#include "G4Proton.hh"
#include "G4DNAGenericIonsManager.hh"
#include "G4NistManager.hh"

class G4DNADingfelderChargeDecreaseModel : public G4VEmModel
{

public:

  G4DNADingfelderChargeDecreaseModel(const G4ParticleDefinition* p = nullptr, 
		          const G4String& nam = "DNADingfelderChargeDecreaseModel");

  ~G4DNADingfelderChargeDecreaseModel() override = default;

  G4DNADingfelderChargeDecreaseModel & operator=(const  G4DNADingfelderChargeDecreaseModel &right) = delete;
  G4DNADingfelderChargeDecreaseModel(const  G4DNADingfelderChargeDecreaseModel&) = delete;

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

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

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

  inline void SelectStationary(G4bool input); 

protected:

  G4ParticleChangeForGamma* fParticleChangeForGamma = nullptr;

private:

  G4bool statCode;

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

  std::map<G4String,G4double,std::less<G4String> > lowEnergyLimit;
  std::map<G4String,G4double,std::less<G4String> > highEnergyLimit;

  G4bool isInitialised{false};
  G4int verboseLevel;
  
  // Partial cross section

  G4double PartialCrossSection(G4double energy, G4int level, const G4ParticleDefinition* particle);

  G4double Sum(G4double energy, const G4ParticleDefinition* particle);

  G4int RandomSelect(G4double energy, const G4ParticleDefinition* particle);
  
  G4int numberOfPartialCrossSections[3]; // 3 is the particle type index

  G4double f0[2][3];
  G4double a0[2][3];
  G4double a1[2][3];
  G4double b0[2][3];
  G4double b1[2][3];
  G4double c0[2][3];
  G4double d0[2][3];
  G4double x0[2][3];
  G4double x1[2][3];

  // Final state

  G4int NumberOfFinalStates(G4ParticleDefinition* particleDefinition, G4int finalStateIndex);
   
  G4ParticleDefinition* OutgoingParticleDefinition(G4ParticleDefinition* particleDefinition, G4int finalStateIndex);
   
  G4double WaterBindingEnergyConstant(G4ParticleDefinition* particleDefinition, G4int finalStateIndex);
   
  G4double OutgoingParticleBindingEnergyConstant(G4ParticleDefinition* particleDefinition, G4int finalStateIndex);
  
  // Reusable particle definitions
  G4ParticleDefinition* protonDef = nullptr;
  G4ParticleDefinition* alphaPlusPlusDef = nullptr;
  G4ParticleDefinition* alphaPlusDef = nullptr;
  G4ParticleDefinition* hydrogenDef = nullptr;
  G4ParticleDefinition* heliumDef = nullptr;

};

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

inline void G4DNADingfelderChargeDecreaseModel::SelectStationary (G4bool input)
{ 
    statCode = input; 
}		 

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

#endif
