//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
// INCL++ intra-nuclear cascade model
// Alain Boudard, CEA-Saclay, France
// Joseph Cugnon, University of Liege, Belgium
// Jean-Christophe David, CEA-Saclay, France
// Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
// Sylvie Leray, CEA-Saclay, France
// Davide Mancusi, CEA-Saclay, France
//
#define INCLXX_IN_GEANT4_MODE 1

#include "globals.hh"

/** \file G4INCLInterpolationTable.hh
 * \brief Simple interpolation table
 *
 * \date 30 January 2014
 * \author Davide Mancusi
 */

#ifndef G4INCLINTERPOLATIONTABLE_HH_
#define G4INCLINTERPOLATIONTABLE_HH_

#include "G4INCLIFunction1D.hh"
#include <algorithm>
#include <functional>
#include <sstream>

namespace G4INCL {

  /// \brief Interpolation node
  class InterpolationNode {
    public:
      InterpolationNode(const G4double x0, const G4double y0, const G4double yPrime0) :
        x(x0),
        y(y0),
        yPrime(yPrime0)
    {}

      virtual ~InterpolationNode() {}

      G4bool operator<(const InterpolationNode &rhs) const {
        return (x < rhs.x);
      }

      G4bool operator<=(const InterpolationNode &rhs) const {
        return (x <= rhs.x);
      }

      G4bool operator>(const InterpolationNode &rhs) const {
        return (x > rhs.x);
      }

      G4bool operator>=(const InterpolationNode &rhs) const {
        return (x >= rhs.x);
      }

      G4double getX() const { return x; }
      G4double getY() const { return y; }
      G4double getYPrime() const { return yPrime; }

      void setX(const G4double x0) { x=x0; }
      void setY(const G4double y0) { y=y0; }
      void setYPrime(const G4double yPrime0) { yPrime=yPrime0; }

      std::string print() const {
        std::stringstream message;
        message << "x, y, yPrime: " << x << '\t' << y << '\t' << yPrime << '\n';
        return message.str();
      }

    protected:
      /// \brief abscissa
      G4double x;
      /// \brief function value
      G4double y;
      /// \brief function derivative
      G4double yPrime;
  };

  /// \brief Class for interpolating the  of a 1-dimensional function
  class InterpolationTable : public IFunction1D {
    public:
      InterpolationTable(std::vector<G4double> const &x, std::vector<G4double> const &y);
      virtual ~InterpolationTable() {}

      std::size_t getNumberOfNodes() const { return nodes.size(); }

      std::vector<G4double> getNodeAbscissae() const;

      std::vector<G4double> getNodeValues() const;

      G4double operator()(const G4double x) const;

      std::string print() const;

    protected:
      InterpolationTable();

      /// \brief Initialise the values of the node derivatives
      void initDerivatives();

      /// \brief Interpolating nodes
      std::vector<InterpolationNode> nodes;

  };

}

#endif // G4INCLINTERPOLATIONTABLE_HH_