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#include "G4UserLimits.hh"
#include "G4SystemOfUnits.hh"

#include "F05Field.hh"

#include "G4FieldManager.hh"
#include "G4TransportationManager.hh"

//#include "G4RepleteEofM.hh"
#include "G4EqEMFieldWithSpin.hh"

#include "G4ClassicalRK4.hh"
#include "G4MagIntegratorStepper.hh"
#include "G4ChordFinder.hh"
#include "G4PropagatorInField.hh"





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F05DetectorConstruction::~F05DetectorConstruction()
{
  if (fField) delete fField;
}




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G4ThreadLocal F05Field* F05DetectorConstruction::fField = 0;

void F05DetectorConstruction::ConstructSDandField()

{
  if (!fField) {

     fField = new F05Field();

//     G4RepleteEofM* equation = new G4RepleteEofM(fField);
     G4EqEMFieldWithSpin* equation = new G4EqEMFieldWithSpin(fField);
//     equation->SetBField();
//     equation->SetEField();
//     equation->SetSpin();

     G4FieldManager* fieldManager
      = G4TransportationManager::GetTransportationManager()->GetFieldManager();
     fieldManager->SetDetectorField(fField);

     G4MagIntegratorStepper* stepper = new G4ClassicalRK4(equation,12);

     G4double minStep           = 0.01*mm;

     G4ChordFinder* chordFinder =
                    new G4ChordFinder((G4MagneticField*)fField,minStep,stepper);

     // Set accuracy parameters
     G4double deltaChord        = 3.0*mm;
     chordFinder->SetDeltaChord( deltaChord );

     G4double deltaOneStep      = 0.01*mm;
     fieldManager->SetAccuraciesWithDeltaOneStep(deltaOneStep);

     G4double deltaIntersection = 0.1*mm;
     fieldManager->SetDeltaIntersection(deltaIntersection);

     G4TransportationManager* transportManager =
                           G4TransportationManager::GetTransportationManager();

     G4PropagatorInField* fieldPropagator =
                                      transportManager->GetPropagatorInField();

     G4double epsMin            = 2.5e-7*mm;
     G4double epsMax            = 0.05*mm;

     fieldPropagator->SetMinimumEpsilonStep(epsMin);
     fieldPropagator->SetMaximumEpsilonStep(epsMax);

     fieldManager->SetChordFinder(chordFinder);
  }
}

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