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////////////////////////////////////////////////////////////////////////////////
//  Class:    G4AdjointCSMatrix
//  Author:         L. Desorgher
//  Organisation:   SpaceIT GmbH
//
//  An adjoint CS matrix is used by the model of a reverse process to sample
//  an adjoint secondary (being equivalent to a forward primary). It represents
//  the integration over the energy of the adjoint secondary (therefore the
//  forward primary) of the differential cross section of the equivalent forward
//  discrete process (Ionisation, Brem, PE effect, Compton,..). Each reverse
//  model has its own cross section matrix for a given cut, material couple. It
//  is therefore recomputed after a modification of the cuts by the user.
//
////////////////////////////////////////////////////////////////////////////////

#ifndef G4AdjointCSMatrix_h
#define G4AdjointCSMatrix_h 1

#include "globals.hh"
#include "G4ParticleDefinition.hh"

#include <vector>

class G4AdjointCSMatrix
{
 public:
  G4AdjointCSMatrix(G4bool aBool);
  ~G4AdjointCSMatrix();

  void Clear();

  void AddData(G4double aPrimEnergy, G4double aCS,
               std::vector<G4double>* aLogSecondEnergyVector,
               std::vector<G4double>* aLogProbVector, std::size_t n_pro_decade = 0);

  G4bool GetData(unsigned int i, G4double& aPrimEnergy, G4double& aCS,
                 G4double& log0, std::vector<G4double>*& aLogSecondEnergyVector,
                 std::vector<G4double>*& aLogProbVector,
                 std::vector<std::size_t>*& aLogProbVectorIndex);

  inline std::vector<G4double>* GetLogPrimEnergyVector()
  {
    return &fLogPrimEnergyVector;
  }

  inline std::vector<G4double>* GetLogCrossSectionvector()
  {
    return &fLogCrossSectionVector;
  }

  inline G4bool IsScatProjToProj() { return fScatProjToProj; }

  void Write(const G4String& file_name);

  void Read(const G4String& file_name);

 private:
  std::vector<G4double> fLogPrimEnergyVector;
  // Adjoint Cross sections as functions of primary energy
  std::vector<G4double> fLogCrossSectionVector;

  std::vector<std::vector<G4double>*> fLogSecondEnergyMatrix;
  std::vector<std::vector<G4double>*> fLogProbMatrix;
  // Each column represents the integrated probability of
  // getting a secondary

  // index of equidistant LogProb
  std::vector<std::vector<std::size_t>*> fLogProbMatrixIndex;
  std::vector<G4double> fLog0Vector;

  std::size_t fNbPrimEnergy = 0;

  G4bool fScatProjToProj;
};
#endif