//
// ********************************************************************
// * 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.          *
// ********************************************************************
//
// $Id: G4PenelopeCompton.hh,v 1.11 2008/03/26 15:30:19 pandola Exp $
// GEANT4 tag $Name: geant4-09-04-beta-cand-01 $
//
// Author: Luciano Pandola
//
// History:
// -----------
// 05 Dec 2002   L. Pandola   1st implementation
// 12 Feb 2003   MG Pia       const argument in SelectRandomAtomForCompton
// 14 Feb 2003   MG Pia       Modified some variables to lowercase initial 
// 26 Mar 2003   L.Pandola    Added fluorescence
// 18 Mar 2004   L.Pandola    Use of std::map (code review)
// 26 Mar 2008   L.Pandola    Add boolean flag to control atomic de-excitation
//
// -------------------------------------------------------------------

// Class description:
// Low Energy Electromagnetic Physics, Compton Scattering
// Penelope Model
// -------------------------------------------------------------------

#ifndef G4PENELOPECOMPTON_HH
#define G4PENELOPECOMPTON_HH 1

#include "globals.hh"
#include "G4VDiscreteProcess.hh"

class G4Track;
class G4Step;
class G4ParticleDefinition;
class G4VParticleChange;
class G4VEMDataSet;
class G4VRangeTest;
class G4Material;

class G4PenelopeCompton : public G4VDiscreteProcess {

public:
  
  G4PenelopeCompton(const G4String& processName ="PenCompton");
  
  ~G4PenelopeCompton();

  G4bool IsApplicable(const G4ParticleDefinition& definition);
  
  void BuildPhysicsTable(const G4ParticleDefinition& photon);
 
  G4VParticleChange* PostStepDoIt(const G4Track& aTrack, const G4Step& aStep);
 
  // For testing purpose only
  G4double DumpMeanFreePath(const G4Track& aTrack, 
			    G4double previousStepSize, 
			    G4ForceCondition* condition) 
  { return GetMeanFreePath(aTrack, previousStepSize, condition); }

  void SetUseAtomicDeexcitation(G4bool value){fUseAtomicDeexcitation = value;};

  G4bool GetUseAtomicDeexcitation(){return fUseAtomicDeexcitation;};

protected:

  G4double GetMeanFreePath(const G4Track& aTrack, 
			   G4double previousStepSize, 
			   G4ForceCondition* condition);

private: 

  // Hide copy constructor and assignment operator as private 
  G4PenelopeCompton& operator=(const G4PenelopeCompton& right);
  G4PenelopeCompton(const G4PenelopeCompton& );

  void ReadData();

  G4double CrossSection(G4double energy,G4int Z);
  G4double DifferentialCrossSection (G4double cdt);

  G4double lowEnergyLimit;  // low energy limit  applied to the process
  G4double highEnergyLimit; // high energy limit applied to the process

  G4VEMDataSet* meanFreePathTable;
  G4VRangeTest* rangeTest;

  const G4double intrinsicLowEnergyLimit; // intrinsic validity range
  const G4double intrinsicHighEnergyLimit;

  G4double energyForIntegration; //for numerical integration of
  G4int ZForIntegration;// analytical cross section
  
  //Parameters of atomic shells
  std::map<G4int,G4DataVector*> *ionizationEnergy;
  std::map<G4int,G4DataVector*> *hartreeFunction;
  std::map<G4int,G4DataVector*> *occupationNumber;

  
  G4int SelectRandomAtomForCompton(const G4Material* material,G4double e) const;

  const G4int nBins; //for building cross section table

  std::vector<G4VEMDataSet*> *matCrossSections; //for random choice of atom

  G4double cutForLowEnergySecondaryPhotons;
  G4bool fUseAtomicDeexcitation;
};

#endif

