//
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//
//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4eIonisationSTD
//
// Author:        Laszlo Urban
//
// Creation date: 20.03.1997
//
// Modifications:
//
// 10-02-00 modifications , new e.m. structure, L.Urban
// 03-08-01 new methods Store/Retrieve PhysicsTable (mma)
// 13-08-01 new function ComputeRestrictedMeandEdx() (mma)
// 19-09-01 come back to previous ProcessName "eIoni"
// 29-10-01 all static functions no more inlined (mma)
// 07-01-02 new design of em processes (V.Ivanchenko)
// 26-12-02 Secondary production moved to derived classes (VI)
// 24-01-03 Make models region aware (V.Ivanchenko)
// 05-02-03 Fix compilation warnings (V.Ivanchenko)
// 13-02-03 SubCutoff regime is assigned to a region (V.Ivanchenko)
//
//
// Class Description:
//
// This class manages the ionisation process for e-/e+
// it inherites from G4VContinuousDiscreteProcess via G4VEnergyLoss.
//

// -------------------------------------------------------------------
//

#ifndef G4eIonisationSTD_h
#define G4eIonisationSTD_h 1

#include "G4VEnergyLossSTD.hh"
#include "G4Electron.hh"
#include "G4Positron.hh"

class G4Material;
class G4ParticleDefinition;

class G4eIonisationSTD : public G4VEnergyLossSTD
{

public:

  G4eIonisationSTD(const G4String& name = "eIoni");

  ~G4eIonisationSTD();

  G4bool IsApplicable(const G4ParticleDefinition& p);

  virtual G4double MinPrimaryEnergy(const G4ParticleDefinition*,
                                    const G4Material*, G4double cut);

  virtual G4std::vector<G4Track*>* SecondariesAlongStep(
                             const G4Step&,
			           G4double&,
			           G4double&,
                                   G4double&);

  virtual void SecondariesPostStep(
                                   G4VEmModel*,
                             const G4MaterialCutsCouple*,
                             const G4DynamicParticle*,
                                   G4double&,
                                   G4double&);

  void SetSubCutoff(G4bool val);

  void PrintInfoDefinition() const;
  // Print out of the class parameters

protected:

  const G4ParticleDefinition* DefineBaseParticle(const G4ParticleDefinition* p);

  virtual G4double MaxSecondaryEnergy(const G4DynamicParticle* dp);

private:

  void InitialiseProcess();

  // hide assignment operator
  G4eIonisationSTD & operator=(const G4eIonisationSTD &right);
  G4eIonisationSTD(const G4eIonisationSTD&);

  const G4ParticleDefinition* theElectron;

  G4bool subCutoff;
  G4bool isElectron;

};

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

inline G4double G4eIonisationSTD::MinPrimaryEnergy(const G4ParticleDefinition*,
                                                   const G4Material*,
                                                         G4double cut)
{
  G4double x = cut;
  if(isElectron) x += cut;
  return x;
}

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

inline G4bool G4eIonisationSTD::IsApplicable(const G4ParticleDefinition& p)
{
  return (&p == G4Electron::Electron() || &p == G4Positron::Positron());
}

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

inline G4double G4eIonisationSTD::MaxSecondaryEnergy(const G4DynamicParticle* dp)
{
  G4double tmax = dp->GetKineticEnergy();
  if(isElectron) tmax *= 0.5;
  return tmax;
}

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

#include "G4VSubCutoffProcessor.hh"

inline G4std::vector<G4Track*>*  G4eIonisationSTD::SecondariesAlongStep(
                           const G4Step&   step,
	             	         G4double& tmax,
			         G4double& eloss,
                                 G4double& kinEnergy)
{
  G4std::vector<G4Track*>* newp = 0;
  if(subCutoff) {
    G4VSubCutoffProcessor* sp = SubCutoffProcessor(CurrentMaterialCutsCoupleIndex());
    if (sp) {
      G4VEmModel* model = SelectModel(kinEnergy);
      newp = sp->SampleSecondaries(step,tmax,eloss,model);
    }
  }
  return newp;
}

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

#include "G4VEmModel.hh"

inline void G4eIonisationSTD::SecondariesPostStep(
                                                  G4VEmModel* model,
                                            const G4MaterialCutsCouple* couple,
                                            const G4DynamicParticle* dp,
                                                  G4double& tcut,
                                                  G4double& kinEnergy)
{
  G4DynamicParticle* delta = model->SampleSecondary(couple, dp, tcut, kinEnergy);
  aParticleChange.SetNumberOfSecondaries(1);
  aParticleChange.AddSecondary(delta);
  G4ThreeVector finalP = dp->GetMomentum();
  kinEnergy -= delta->GetKineticEnergy();
  finalP -= delta->GetMomentum();
  finalP = finalP.unit();
  aParticleChange.SetMomentumDirectionChange(finalP);
}

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

#endif