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//
// 25-08-06 New Final State type (refFlag==3 , Legendre (Low Energy) + Probability (High Energy) )
//          is added by T. KOI
//
// P. Arce, June-2014 Conversion neutron_hp to particle_hp
//
#ifndef G4ParticleHPElasticFS_h
#define G4ParticleHPElasticFS_h 1

#include "G4HadFinalState.hh"
#include "G4HadProjectile.hh"
#include "G4ParticleHPFastLegendre.hh"
#include "G4ParticleHPFinalState.hh"
#include "G4ParticleHPInterpolator.hh"
#include "G4ParticleHPLegendreStore.hh"
#include "G4ParticleHPNames.hh"
#include "G4ParticleHPPartial.hh"
#include "G4ParticleHPVector.hh"
#include "G4ReactionProduct.hh"
#include "globals.hh"

class G4ParticleHPElasticFS : public G4ParticleHPFinalState
{
  public:

    G4ParticleHPElasticFS();
    ~G4ParticleHPElasticFS() override
    {
      delete theCoefficients;
      delete theProbArray;
    }
    void Init(G4double A, G4double Z, G4int M, const G4String& dirName,
              const G4String& aFSType, G4ParticleDefinition*) override;
    G4HadFinalState* ApplyYourself(const G4HadProjectile& theTrack) override;
    G4ParticleHPFinalState* New() override
    {
      auto theNew = new G4ParticleHPElasticFS;
      return theNew;
    }

    // New method useful for the DBRC algorithm
    void RegisterCrossSection(G4ParticleHPVector* vec) { xsForDBRC = vec; }

  private:

    // The following two methods and six data members are needed for the DBRC algorithm
    void InitializeScatteringKernelParameters();
    G4ReactionProduct GetBiasedThermalNucleus(const G4double aMass, G4ThreeVector aVelocity,
                                              const G4double temp = -1.);
    G4double svtEmax;
    G4double dbrcEmax;
    G4double dbrcEmin;
    G4double dbrcAmin;
    G4bool dbrcUse;
    G4ParticleHPVector* xsForDBRC;

    G4int repFlag;  // Legendre coeff(1), or probability array(2), or isotropic(0).
                    // add 3: for Legendre (Low Energy) + Probability (High Energy)
    G4double tE_of_repFlag3;  // transition energy in case of  repFlag 3:
    G4double targetMass;  // in neutronmass units.
    G4int frameFlag;  // CMS or Lab system.

    G4ParticleHPLegendreStore* theCoefficients;  // the legendre coefficients
    G4ParticleHPPartial* theProbArray;  // the probability array p,costh for energy

    G4ParticleHPFastLegendre theLegend;  // fast look-up for leg-integrals
};
#endif