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

#include <fstream>

class G4ParticleHPAngular
{
    struct toBeCached
    {
        const G4ReactionProduct* theProjectileRP{nullptr};
        const G4ReactionProduct* theTarget{nullptr};
        toBeCached() = default;
    };

  public:
    G4ParticleHPAngular()
    {
      theIsoFlag = true;
      theCoefficients = nullptr;
      theProbArray = nullptr;
      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