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//
// $Id: G4VAdjointReverseReaction.cc,v 1.2 2009/11/20 10:31:20 ldesorgh Exp $
// GEANT4 tag $Name: geant4-09-04-beta-01 $
//
#include "G4VAdjointReverseReaction.hh"
#include "G4AdjointCSManager.hh"
#include "G4AdjointCSMatrix.hh"
#include "G4AdjointInterpolator.hh"
#include "G4AdjointCSMatrix.hh"
#include "G4VEmAdjointModel.hh"
#include "G4ElementTable.hh"
#include "G4Element.hh"
#include "G4Material.hh"
#include "G4MaterialCutsCouple.hh"
#include "G4AdjointCSManager.hh"
#include "G4ParticleChange.hh"
#include "G4AdjointElectron.hh"


G4VAdjointReverseReaction::
	G4VAdjointReverseReaction(G4String process_name, G4bool whichScatCase):
			G4VDiscreteProcess(process_name)
{theAdjointCSManager = G4AdjointCSManager::GetAdjointCSManager();
 IsScatProjToProjCase=whichScatCase;
 fParticleChange=new G4ParticleChange();
 
}
//////////////////////////////////////////////////////////////////////////////
//
G4VAdjointReverseReaction::
	~G4VAdjointReverseReaction()
{;
}			
//////////////////////////////////////////////////////////////////////////////
//
void G4VAdjointReverseReaction::PreparePhysicsTable(const G4ParticleDefinition&)
{;
}
//////////////////////////////////////////////////////////////////////////////
//
void G4VAdjointReverseReaction::BuildPhysicsTable(const G4ParticleDefinition&)
{

 theAdjointCSManager->BuildCrossSectionMatrices(); //do not worry it will be done just once
 theAdjointCSManager->BuildTotalSigmaTables();

}
//////////////////////////////////////////////////////////////////////////////
//
G4VParticleChange* G4VAdjointReverseReaction::PostStepDoIt(const G4Track& track, const G4Step&  )
{ 
  
  
  
  fParticleChange->Initialize(track);
 
 /* if (IsFwdCSUsed && IsIntegralModeUsed){ //INtegral mode still unstable
  	 G4double Tkin = step.GetPostStepPoint()->GetKineticEnergy();
  	 G4double fwdCS = theAdjointCSManager->GetTotalForwardCS(track.GetDefinition(), Tkin, track.GetMaterialCutsCouple());
	 //G4cout<<"lastCS "<<lastCS<<G4endl;
	 if (fwdCS<lastCS*G4UniformRand()) { // the reaction does not take place, same integral method as the one used for forward ionisation in  G4 
	 	ClearNumberOfInteractionLengthLeft();
  		return fParticleChange;
	 } 
	 
  }
 */
 
  theAdjointEMModel->SampleSecondaries(track,
                                       IsScatProjToProjCase,
					fParticleChange);
  
  ClearNumberOfInteractionLengthLeft();
  return fParticleChange;
  			
   
  
}
//////////////////////////////////////////////////////////////////////////////
//
G4double G4VAdjointReverseReaction::GetMeanFreePath(const G4Track& track,
                                         					     G4double ,
                                         					     G4ForceCondition* condition)
{ *condition = NotForced;
  G4double preStepKinEnergy = track.GetKineticEnergy();
  
  G4double Sigma =
  		theAdjointEMModel->AdjointCrossSection(track.GetMaterialCutsCouple(),preStepKinEnergy,IsScatProjToProjCase);
  		
  G4double fwd_TotCS;
  Sigma *=  theAdjointCSManager->GetCrossSectionCorrection(track.GetDefinition(),preStepKinEnergy,track.GetMaterialCutsCouple(),IsFwdCSUsed, fwd_TotCS);
  //G4cout<<fwd_TotCS<<G4endl;
  /*if (IsFwdCSUsed && IsIntegralModeUsed){ //take the maximum cross section only for charged particle		
  	G4double e_sigma_max, sigma_max;
	theAdjointCSManager->GetMaxFwdTotalCS(track.GetDefinition(),
	 		   	     track.GetMaterialCutsCouple(), e_sigma_max, sigma_max);
	if (e_sigma_max > preStepKinEnergy){
		Sigma*=sigma_max/fwd_TotCS;
	}		     
  }
  */		

  G4double mean_free_path = 1.e60 *mm; 
  if (Sigma>0) mean_free_path = 1./Sigma;
  lastCS=Sigma;
  
  /*G4cout<<"Sigma  "<<Sigma<<G4endl;
  G4cout<<"mean_free_path [mm] "<<mean_free_path/mm<<G4endl;
  */
  

  return mean_free_path;
}