//
// ********************************************************************
// * 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.          *
// ********************************************************************
//
/// \file F04SteppingAction.cc
/// \brief Implementation of the F04SteppingAction class

#include "F04SteppingAction.hh"

#include "F04UserTrackInformation.hh"

#include "G4LogicalVolumeStore.hh"
#include "G4ParticleTypes.hh"
#include "G4SteppingManager.hh"
#include "G4Track.hh"

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

void F04SteppingAction::UserSteppingAction(const G4Step* theStep)
{
  G4Track* theTrack = theStep->GetTrack();

  // Get pointers to test volumes (only once)
  if (!fTargetVolume) {
    fTargetVolume = G4LogicalVolumeStore::GetInstance()->GetVolume("Target");
    fTestPlaneVolume = G4LogicalVolumeStore::GetInstance()->GetVolume("TestPlane");
  }

  if (theTrack->GetParentID() == 0) {
    // This is a primary track
    G4LogicalVolume* theVolume =
      theStep->GetPreStepPoint()->GetPhysicalVolume()->GetLogicalVolume();
    if (theVolume != fTargetVolume) {
      theTrack->SetTrackStatus(fStopAndKill);
      return;
    }
  }

  //  G4ParticleDefinition* particleType = theTrack->GetDefinition();

  // check if it is entering the test volume
  G4StepPoint* thePrePoint = theStep->GetPreStepPoint();
  G4VPhysicalVolume* thePrePV = thePrePoint->GetPhysicalVolume();
  G4LogicalVolume* thePreLV = thePrePV->GetLogicalVolume();

  G4LogicalVolume* thePostLV = nullptr;
  G4StepPoint* thePostPoint = theStep->GetPostStepPoint();

  if (thePostPoint) {
    G4VPhysicalVolume* thePostPV = thePostPoint->GetPhysicalVolume();
    if (thePostPV) thePostLV = thePostPV->GetLogicalVolume();
  }

  if (thePostLV == fTestPlaneVolume && thePreLV != fTestPlaneVolume) {
    //     G4double x = theTrack->GetPosition().x();
    //     G4double y = theTrack->GetPosition().y();

    G4ThreeVector theMomentumDirection = theTrack->GetDynamicParticle()->GetMomentumDirection();
    //     G4double theTotalMomentum = theTrack->GetDynamicParticle()->
    //                                                    GetTotalMomentum();

    // then kill the track
    theTrack->SetTrackStatus(fStopAndKill);
    return;
  }

  //  G4double z = theTrack->GetPosition().z();

  auto trackInformation = (F04UserTrackInformation*)theTrack->GetUserInformation();

  if (trackInformation->GetTrackStatusFlag() != reverse) {
    if (thePreLV != fTargetVolume) {
      if (theTrack->GetMomentumDirection().z() > 0.0
          && theTrack->GetVertexMomentumDirection().z() < 0.0)
      {
        trackInformation->SetTrackStatusFlag(reverse);
      }
    }
  }

  // check if it is alive
  if (theTrack->GetTrackStatus() == fAlive) {
    return;
  }

  if (thePostPoint->GetProcessDefinedStep() != nullptr) {
    if (thePostPoint->GetProcessDefinedStep()->GetProcessName() != "Decay") return;
  }
}
