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// GEANT4 physics class: G4ChipsPionMinusInelasticXS -- header file
// Created: M.V. Kossov, CERN/ITEP(Moscow), 20-Dec-01
// The last update: M.V. Kossov, CERN/ITEP (Moscow) 17-May-02
//
// -------------------------------------------------------------------------------------
// Short description: Cross-sections extracted (by W.Pokorski) from the CHIPS package for 
// pion interactions. Original author: M. Kossov
// -------------------------------------------------------------------------------------
//

#ifndef G4ChipsPionMinusInelasticXS_h
#define G4ChipsPionMinusInelasticXS_h 1

#include "G4ParticleTable.hh"
#include "G4NucleiProperties.hh"
#include <vector>
#include "G4VCrossSectionDataSet.hh"

class G4ChipsPionMinusInelasticXS :  public G4VCrossSectionDataSet
{
public:

  G4ChipsPionMinusInelasticXS();

  ~G4ChipsPionMinusInelasticXS();

  static const char* Default_Name() {return "ChipsPionMinusInelasticXS";}

  virtual void CrossSectionDescription(std::ostream&) const;
  
  virtual G4bool IsIsoApplicable(const G4DynamicParticle* Pt, G4int Z, G4int A,    
				 const G4Element* elm,
				 const G4Material* mat );

  // At present momentum (pMom) in MeV/c, CS in mb (@@ Units)
  virtual G4double GetIsoCrossSection(const G4DynamicParticle*, G4int tgZ, G4int A,  
				      const G4Isotope* iso = 0,
				      const G4Element* elm = 0,
				      const G4Material* mat = 0);

  virtual G4double GetChipsCrossSection(G4double momentum, G4int Z, G4int N, G4int pdg);

private:
  G4double CalculateCrossSection(G4int F, G4int I, G4int PDG, G4int Z,
                                 G4int N, G4double Momentum);

  G4int    GetFunctions(G4int tZ, G4int tN, G4double* y, G4double* z); // y&z=ArrayPointers //Uzhi
  G4double CrossSectionLin(G4int targZ, G4int targN, G4double P);
  G4double CrossSectionLog(G4int targZ, G4int targN, G4double lP);
  G4double CrossSectionFormula(G4int targZ, G4int targN, G4double P, G4double lP);
  G4double ThresholdMomentum(G4int targZ, G4int targN); // Threshold of pA reaction (MeV/c) // Uzhi
  G4double EquLinearFit(G4double X, G4int N, G4double X0, G4double DX, G4double* Y);
// Body
private:
   G4double  lastSig=0.; // Last value of the Cross Section
   G4double* lastLEN; // Pointer to the last array of LowEnergy cross sections
   G4double* lastHEN; // Pointer to the last array of HighEnergy cross sections
   G4double  lastE=0.;  // Last used in the cross section Energy
   G4int     lastPDG=0; // The last projectile PDG
   G4int     lastN;   // The last N of calculated nucleus
   G4int     lastZ;   // The last Z of calculated nucleus
   G4double  lastP;   // Last used in the cross section Momentum
   G4double  lastTH;  // Last value of the Momentum Threshold
   G4double  lastCS;  // Last value of the Cross Section
   G4int     lastI;   // The last position in the DAMDB
   std::vector<G4double*>* LEN;  // Vector of pointers to LowEnProtonCrossSection
   std::vector<G4double*>* HEN;  // Vector of pointers to HighEnProtonCrossSection
    
   G4int j=0;                    // A#0f Z/N-records already tested in AMDB
   std::vector <G4int> colN;  // Vector of N for calculated nuclei (isotops)
   std::vector <G4int> colZ;  // Vector of Z for calculated nuclei (isotops)
   std::vector <G4double> colP;  // Vector of last momenta for the reaction
   std::vector <G4double> colTH; // Vector of energy thresholds for the reaction
   std::vector <G4double> colCS; // Vector of last cross sections for the reaction
};

#endif
