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// P. Arce, June-2014 Conversion neutron_hp to particle_hp
//
#ifndef G4ParticleHPEvapSpectrum_h
#define G4ParticleHPEvapSpectrum_h 1

#include "G4ParticleHPVector.hh"
#include "G4VParticleHPEDis.hh"
#include "G4ios.hh"
#include "Randomize.hh"
#include "globals.hh"

#include <CLHEP/Units/SystemOfUnits.h>

#include <fstream>

// we will need a List of these .... one per term.

class G4ParticleHPEvapSpectrum : public G4VParticleHPEDis
{
  public:
    G4ParticleHPEvapSpectrum() = default;
    ~G4ParticleHPEvapSpectrum() override = default;

    inline void Init(std::istream& aDataFile) override
    {
      theFractionalProb.Init(aDataFile);
      theThetaDist.Init(aDataFile);
      theXDist.Init(aDataFile);
    }

    inline G4double GetFractionalProbability(G4double anEnergy) override
    {
      return theFractionalProb.GetY(anEnergy);
    }

    inline G4double Sample(G4double anEnergy) override
    {
      // when this is called, theFractionalProb was used, and 'k' is sorted out already.
      G4double x = theXDist.Sample();
      G4double theta = theThetaDist.GetY(anEnergy);
      G4double result = x * theta;
      return result * CLHEP::eV;
    }

  private:
    G4ParticleHPVector theFractionalProb;

    G4ParticleHPVector theThetaDist;
    G4ParticleHPVector theXDist;
};

#endif