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// $Id: F05SteppingAction.cc 68021 2013-03-13 13:36:07Z gcosmo $
//
/// \file field/field05/src/F05SteppingAction.cc
/// \brief Implementation of the F05SteppingAction class
//

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#include "F05SteppingAction.hh"

#include "G4Step.hh"
#include "G4Track.hh"
#include "G4ProcessTable.hh"
#include "G4SystemOfUnits.hh"

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F05SteppingAction::F05SteppingAction(void)
{;}

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F05SteppingAction::~F05SteppingAction()
{;}

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void F05SteppingAction::UserSteppingAction(const G4Step* aStep)
{

  G4String processName = aStep->GetPostStepPoint()->
                               GetProcessDefinedStep()->GetProcessName();

  if(processName != "DecayWithSpin" ){

     G4Track* aTrack= aStep->GetTrack();

     G4String particleName = aStep->GetTrack()->
                                    GetDefinition()->GetParticleName();

     G4ThreeVector polDir  = aTrack->GetPolarization();
     G4ThreeVector momDir  = aTrack->GetMomentumDirection();

     if (particleName == "mu+") {
        if (momDir * polDir < (1.-1.E-7)) {

           G4double cos_theta = momDir * polDir;
           G4double gTime     = aTrack->GetGlobalTime();

           G4cout << " *** ERROR - WARNING *** " << G4endl;
           G4cout << "processName: " << processName << G4endl;
           G4cout << "particleName " << particleName << G4endl;
           G4cout << "Global Time: " << gTime/ns << "nsec" << G4endl;
           G4cout << "Angle between spin and momentum:" << cos_theta << G4endl;
           G4Exception("SteppingAction::UserSteppingAction","Error",
                       FatalException,
                       "Angle between spin and momentum too large");
        }
     }
  }
}
