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//
// 070613 fix memory leaking by T. Koi
//
// P. Arce, June-2014 Conversion neutron_hp to particle_hp
//
#ifndef G4ParticleHPAngular_h
#define G4ParticleHPAngular_h 1

#include <fstream>

#include "globals.hh"
#include "G4ios.hh"
#include "G4ReactionProduct.hh"
#include "Randomize.hh"
#include "G4ParticleHPLegendreStore.hh"
#include "G4ParticleHPPartial.hh"
#include "G4Cache.hh"

class G4ParticleHPAngular
{
   struct toBeCached
   {
      const G4ReactionProduct* theProjectileRP;
      const G4ReactionProduct* theTarget;
      toBeCached() : theProjectileRP(0),theTarget(0) {}
   };

public:
    
  G4ParticleHPAngular()
  {
    theIsoFlag = true;
    theCoefficients = 0;
    theProbArray = 0;
    toBeCached val;
    fCache.Put( val );
      
    theAngularDistributionType = 0;
    frameFlag = 0;
    targetMass = 0.0;
  } 

  ~G4ParticleHPAngular()
  {
    delete theCoefficients;
    delete theProbArray;
  }
  
  void Init(std::istream & aDataFile);
  
  void SampleAndUpdate(G4ReactionProduct & anIncidentParticle);
    
  void SetTarget(const G4ReactionProduct & aTarget)
  {
    fCache.Get().theTarget = &aTarget;
  }

  void SetProjectileRP(const G4ReactionProduct & anIncidentParticleRP)
  {
    fCache.Get().theProjectileRP = &anIncidentParticleRP;
  }

  inline G4double GetTargetMass()
  {
    return targetMass;
  }

private:
  
  // the type of distribution; currently 
  // isotropic (0), 
  // and legendre representation (1)
  // probability distribution (2)
  // are supported
  
  G4int theAngularDistributionType;
  G4int frameFlag; // 1=Lab, 2=CMS
    
  G4bool theIsoFlag; // isotropic or not?
  
  G4ParticleHPLegendreStore * theCoefficients; // the legendre coefficients

  G4ParticleHPPartial * theProbArray;
    // the probability array p,costh for energy

  G4double targetMass;

  G4Cache<toBeCached> fCache;
};

#endif
