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/// \file F05SteppingAction.cc
/// \brief Implementation of the F05SteppingAction class

#include "F05SteppingAction.hh"

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

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

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");
      }
    }
  }
}
