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// $Id: G4PSFlatSurfaceFlux.cc,v 1.2 2008/12/29 00:17:14 asaim Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
// G4PSFlatSurfaceFlux
#include "G4PSFlatSurfaceFlux.hh"
#include "G4StepStatus.hh"
#include "G4Track.hh"
#include "G4VSolid.hh"
#include "G4VPhysicalVolume.hh"
#include "G4VPVParameterisation.hh"
#include "G4UnitsTable.hh"
#include "G4GeometryTolerance.hh"
////////////////////////////////////////////////////////////////////////////////
// (Description)
//   This is a primitive scorer class for scoring Surface Flux.
//  Current version assumes only for G4Box shape, and the surface
//  is fixed on -Z plane.
//
// Surface is defined at the -Z surface.
// Direction                  -Z   +Z
//   0  IN || OUT            ->|<-  |
//   1  IN                   ->|    |
//   2  OUT                    |<-  |
//
// Created: 2005-11-14  Tsukasa ASO, Akinori Kimura.
// 
// 18-Nov-2005  T.Aso,  To use always positive value for anglefactor.
// 29-Mar-2007  T.Aso,  Bug fix for momentum direction at outgoing flux.
///////////////////////////////////////////////////////////////////////////////

G4PSFlatSurfaceFlux::G4PSFlatSurfaceFlux(G4String name, 
					 G4int direction, G4int depth)
  :G4VPrimitiveScorer(name,depth),HCID(-1),fDirection(direction)
{;}

G4PSFlatSurfaceFlux::~G4PSFlatSurfaceFlux()
{;}

G4bool G4PSFlatSurfaceFlux::ProcessHits(G4Step* aStep,G4TouchableHistory*)
{
  G4StepPoint* preStep = aStep->GetPreStepPoint();
  G4VPhysicalVolume* physVol = preStep->GetPhysicalVolume();
  G4VPVParameterisation* physParam = physVol->GetParameterisation();
  G4VSolid * solid = 0;
  if(physParam)
  { // for parameterized volume
    G4int idx = ((G4TouchableHistory*)(aStep->GetPreStepPoint()->GetTouchable()))
                ->GetReplicaNumber(indexDepth);
    solid = physParam->ComputeSolid(idx, physVol);
    solid->ComputeDimensions(physParam,idx,physVol);
  }
  else
  { // for ordinary volume
    solid = physVol->GetLogicalVolume()->GetSolid();
  }

//  if( solid->GetEntityType() != "G4Box" ){
//    G4Exception("G4PSFlatSurfaceFluxScorer. - Solid type is not supported.");
//    return FALSE;
//  }
  G4Box* boxSolid = (G4Box*)(solid);

  G4int dirFlag =IsSelectedSurface(aStep,boxSolid);
  if ( dirFlag > 0 ) {
    if ( fDirection == fFlux_InOut || fDirection == dirFlag ){

      G4StepPoint* thisStep=0;
      if ( dirFlag == fFlux_In ){
	thisStep = preStep;
      }else if ( dirFlag == fFlux_Out ){
	thisStep = aStep->GetPostStepPoint();
      }else{
	return FALSE;
      }

      G4TouchableHandle theTouchable = thisStep->GetTouchableHandle();
      G4ThreeVector pdirection = thisStep->GetMomentumDirection();
      G4ThreeVector localdir  = 
	theTouchable->GetHistory()->GetTopTransform().TransformAxis(pdirection);
      //
      G4double angleFactor = localdir.z();
      if ( angleFactor < 0 ) angleFactor *= -1.;
      G4double flux = preStep->GetWeight(); // Current (Particle Weight)
      //
      G4double square = 4.*boxSolid->GetXHalfLength()*boxSolid->GetYHalfLength();
      //
      flux = flux/angleFactor/square;  // Flux with angle.
      //
      G4int index = GetIndex(aStep);
      EvtMap->add(index,flux);
    }
  }
#ifdef debug
    G4cout << " PASSED vol " 
	   << index << " trk "<<trkid<<" len " << fFlatSurfaceFlux<<G4endl;
#endif

  return TRUE;
}

G4int G4PSFlatSurfaceFlux::IsSelectedSurface(G4Step* aStep, G4Box* boxSolid){

  G4TouchableHandle theTouchable = 
    aStep->GetPreStepPoint()->GetTouchableHandle();
  G4double kCarTolerance=G4GeometryTolerance::GetInstance()->GetSurfaceTolerance();

  if (aStep->GetPreStepPoint()->GetStepStatus() == fGeomBoundary ){
    // Entering Geometry
    G4ThreeVector stppos1= aStep->GetPreStepPoint()->GetPosition();
    G4ThreeVector localpos1 = 
      theTouchable->GetHistory()->GetTopTransform().TransformPoint(stppos1);
    if(std::fabs( localpos1.z() + boxSolid->GetZHalfLength())<kCarTolerance ){
      return fFlux_In;
    }
  }

  if (aStep->GetPostStepPoint()->GetStepStatus() == fGeomBoundary ){
    // Exiting Geometry
    G4ThreeVector stppos2= aStep->GetPostStepPoint()->GetPosition();
    G4ThreeVector localpos2 = 
      theTouchable->GetHistory()->GetTopTransform().TransformPoint(stppos2);
    if(std::fabs( localpos2.z() + boxSolid->GetZHalfLength())<kCarTolerance ){
      return fFlux_Out;
    }
  }

  return -1;
}

void G4PSFlatSurfaceFlux::Initialize(G4HCofThisEvent* HCE)
{
  EvtMap = new G4THitsMap<G4double>(GetMultiFunctionalDetector()->GetName(),
				    GetName());
  if ( HCID < 0 ) HCID = GetCollectionID(0);
  HCE->AddHitsCollection(HCID, (G4VHitsCollection*)EvtMap);
}

void G4PSFlatSurfaceFlux::EndOfEvent(G4HCofThisEvent*)
{;}

void G4PSFlatSurfaceFlux::clear(){
  EvtMap->clear();
}

void G4PSFlatSurfaceFlux::DrawAll()
{;}

void G4PSFlatSurfaceFlux::PrintAll()
{
  G4cout << " MultiFunctionalDet  " << detector->GetName() << G4endl;
  G4cout << " PrimitiveScorer" << GetName() <<G4endl; 
  G4cout << " Number of entries " << EvtMap->entries() << G4endl;
  std::map<G4int,G4double*>::iterator itr = EvtMap->GetMap()->begin();
  for(; itr != EvtMap->GetMap()->end(); itr++) {
    G4cout << "  copy no.: " << itr->first
	   << "  flux  : " << *(itr->second)*cm*cm << " [cm^-2]"
	   << G4endl;
  }
}