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//
// P. Arce, June-2014 Conversion neutron_hp to particle_hp
//
#ifndef G4ParticleHPPolynomExpansion_h
#define G4ParticleHPPolynomExpansion_h 1

#include "G4ios.hh"
#include "globals.hh"

#include <CLHEP/Units/SystemOfUnits.h>

#include <fstream>

class G4ParticleHPPolynomExpansion
{
  public:

    G4ParticleHPPolynomExpansion()
    {
      theCoeff = nullptr;
      nPoly = 0;
    }
    ~G4ParticleHPPolynomExpansion() { delete[] theCoeff; }

    inline void Init(std::istream& theData)
    {
      theData >> nPoly;
      theCoeff = new G4double[nPoly];
      G4int i;
      for (i = 0; i < nPoly; i++) {
        theData >> theCoeff[i];
      }
    }

    inline G4double GetValue(G4double anEnergy) const
    {
      G4int i;
      G4double result = 0;
      G4double base = anEnergy / CLHEP::eV;
      G4double running = 1;
      for (i = 0; i < nPoly; i++) {
        result += theCoeff[i] * running;
        running *= base;
      }
      return result;
    }

  private:

    G4int nPoly;
    G4double* theCoeff;
};

#endif