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// $Id$
//
// Hadronic Process: Nuclear De-excitations
// by V. Lara (Oct 1998)

#ifndef G4CompetitiveFission_h
#define G4CompetitiveFission_h 1

#include "G4VEvaporationChannel.hh"
#include "G4Fragment.hh"
#include "G4VFissionBarrier.hh"
#include "G4FissionBarrier.hh"
#include "G4VEmissionProbability.hh"
#include "G4FissionProbability.hh"
#include "G4VLevelDensityParameter.hh"
#include "G4FissionLevelDensityParameter.hh"
#include "G4FissionParameters.hh"
#include "Randomize.hh"
#include <CLHEP/Units/SystemOfUnits.h>

class G4CompetitiveFission : public G4VEvaporationChannel
{
public:
  
  explicit G4CompetitiveFission();
  virtual ~G4CompetitiveFission();

  virtual G4Fragment* EmittedFragment(G4Fragment* theNucleus);

  virtual G4double GetEmissionProbability(G4Fragment* theNucleus);

  inline void SetFissionBarrier(G4VFissionBarrier * aBarrier);

  inline void SetEmissionStrategy(G4VEmissionProbability * aFissionProb);

  inline void SetLevelDensityParameter(G4VLevelDensityParameter * aLevelDensity);

  inline G4double GetFissionBarrier(void) const;

  inline G4double GetLevelDensityParameter(void) const;

  inline G4double GetMaximalKineticEnergy(void) const;

private:

  // Sample AtomicNumber of Fission products
  G4int FissionAtomicNumber(G4int A);

  G4double MassDistribution(G4double x, G4int A);

  // Sample Charge of fission products
  G4int FissionCharge(G4int A, G4int Z, G4double Af);

  // Sample Kinetic energy of fission products
  G4double FissionKineticEnergy(G4int A, G4int Z,
				G4int Af1, G4int Zf1,
				G4int Af2, G4int Zf2,
				G4double U, G4double Tmax);
    
  inline G4double Ratio(G4double A, G4double A11, G4double B1, G4double A00);

  inline G4double SymmetricRatio(G4int A, G4double A11);

  inline G4double AsymmetricRatio(G4int A, G4double A11);

  G4CompetitiveFission(const G4CompetitiveFission &right) = delete;
  const G4CompetitiveFission & operator=(const G4CompetitiveFission &right) = delete;
  G4bool operator==(const G4CompetitiveFission &right) const = delete;
  G4bool operator!=(const G4CompetitiveFission &right) const = delete;

  // Maximal Kinetic Energy that can be carried by fragment
  G4double MaximalKineticEnergy;

  // For Fission barrier
  G4VFissionBarrier * theFissionBarrierPtr;
  G4double FissionBarrier;
  G4bool MyOwnFissionBarrier;

  // For Fission probability emission
  G4VEmissionProbability * theFissionProbabilityPtr;
  G4double FissionProbability;
  G4bool MyOwnFissionProbability;

  // For Level Density calculation
  G4bool MyOwnLevelDensity;
  G4VLevelDensityParameter * theLevelDensityPtr;
  G4double LevelDensityParameter;

  G4PairingCorrection* pairingCorrection;

  G4FissionParameters theParam;

};

inline void G4CompetitiveFission::SetFissionBarrier(G4VFissionBarrier * aBarrier)
{
  if (MyOwnFissionBarrier) delete theFissionBarrierPtr;
  theFissionBarrierPtr = aBarrier;
  MyOwnFissionBarrier = false;
}

inline void 
G4CompetitiveFission::SetEmissionStrategy(G4VEmissionProbability * aFissionProb)
{
  if (MyOwnFissionProbability) delete theFissionProbabilityPtr;
  theFissionProbabilityPtr = aFissionProb;
  MyOwnFissionProbability = false;
}

inline void 
G4CompetitiveFission::SetLevelDensityParameter(G4VLevelDensityParameter* aLevelDensity)
{ 
  if (MyOwnLevelDensity) delete theLevelDensityPtr;
  theLevelDensityPtr = aLevelDensity;
  MyOwnLevelDensity = false;
}

inline G4double G4CompetitiveFission::GetFissionBarrier(void) const 
{ 
  return FissionBarrier; 
}

inline G4double G4CompetitiveFission::GetLevelDensityParameter(void) const 
{ 
  return LevelDensityParameter; 
}

inline G4double G4CompetitiveFission::GetMaximalKineticEnergy(void) const 
{ 
  return MaximalKineticEnergy; 
}

inline
G4double G4CompetitiveFission::Ratio(G4double A, G4double A11,
				     G4double B1, G4double A00) 
{
  G4double res;
  if (A11 >= A*0.5 && A11 <= (A00+10.0)) {
    G4double x = (A11-A00)/A;
    res = 1.0 - B1*x*x;
  } else {
    G4double x = 10.0/A;
    res = 1.0 - B1*x*x - 2.0*x*B1*(A11-A00-10.0)/A;
  }
  return res;
}

inline
G4double G4CompetitiveFission::AsymmetricRatio(G4int A, G4double A11)
{
  return Ratio(G4double(A),A11,23.5,134.0);
}

inline
G4double G4CompetitiveFission::SymmetricRatio(G4int A, G4double A11)
{
  G4double A0 = G4double(A);
  return Ratio(A0,A11,5.32,A0*0.5);
}

#endif


