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// $Id: HadrontherapyDetectorROGeometry.cc; 
// See more at: http://g4advancedexamples.lngs.infn.it/Examples/hadrontherapy

#include "HadrontherapyDetectorROGeometry.hh"
#include "HadrontherapyDummySD.hh"
#include "G4LogicalVolume.hh"
#include "G4VPhysicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4PVReplica.hh"
#include "G4Box.hh"
#include "G4ThreeVector.hh"
#include "G4Material.hh"

/////////////////////////////////////////////////////////////////////////////
HadrontherapyDetectorROGeometry::HadrontherapyDetectorROGeometry(G4String aString,
								 G4ThreeVector detectorToWorldPosition,
								 G4double detectorDimX,
								 G4double detectorDimY,
								 G4double detectorDimZ,
								 G4int numberOfVoxelsX,
								 G4int numberOfVoxelsY,
								 G4int numberOfVoxelsZ):
   
    G4VReadOutGeometry(aString),
    detectorToWorldPosition(detectorToWorldPosition),
    detectorSizeX(detectorDimX),
    detectorSizeY(detectorDimY),
    detectorSizeZ(detectorDimZ),
    numberOfVoxelsAlongX(numberOfVoxelsX),
    numberOfVoxelsAlongY(numberOfVoxelsY),
    numberOfVoxelsAlongZ(numberOfVoxelsZ)
{
}

/////////////////////////////////////////////////////////////////////////////
HadrontherapyDetectorROGeometry::~HadrontherapyDetectorROGeometry()
{
}

/////////////////////////////////////////////////////////////////////////////
G4VPhysicalVolume* HadrontherapyDetectorROGeometry::Build()
{
  // A dummy material is used to fill the volumes of the readout geometry.
  // (It will be allowed to set a NULL pointer in volumes of such virtual
  // division in future, since this material is irrelevant for tracking.)

  G4Material* dummyMat = new G4Material(name="dummyMat", 1., 1.*g/mole, 1.*g/cm3);

  G4double worldSizeX = 200.0 *cm;
  G4double worldSizeY = 200.0 *cm;
  G4double worldSizeZ = 200.0 *cm;

  G4double halfDetectorSizeX = detectorSizeX;
  G4double halfDetectorSizeY = detectorSizeY;
  G4double halfDetectorSizeZ = detectorSizeZ;

  // World volume of ROGeometry ...
  G4Box* ROWorld = new G4Box("ROWorld",
			     worldSizeX,
			     worldSizeY,
			     worldSizeZ);
  
  G4LogicalVolume* ROWorldLog = new G4LogicalVolume(ROWorld, dummyMat, 
						    "ROWorldLog", 0,0,0);
  
  G4VPhysicalVolume* ROWorldPhys = new G4PVPlacement(0,G4ThreeVector(), 
						     "ROWorldPhys", 
						     ROWorldLog, 
						     0,false,0);

  // Detector ROGeometry 
  G4Box *RODetector = new G4Box("RODetector", 
			       halfDetectorSizeX, 
			       halfDetectorSizeY, 
			       halfDetectorSizeZ);

  G4LogicalVolume *RODetectorLog = new G4LogicalVolume(RODetector,
						       dummyMat,
						      "RODetectorLog",
						      0,0,0);
  
  G4VPhysicalVolume *RODetectorPhys = new G4PVPlacement(0,
                            detectorToWorldPosition,
							"DetectorPhys",
							RODetectorLog,
							ROWorldPhys,
							false,0);
  
  
  // Division along X axis: the detector is divided in slices along the X axis
  
  G4double halfXVoxelSizeX = halfDetectorSizeX/numberOfVoxelsAlongX;
  G4double halfXVoxelSizeY = halfDetectorSizeY;
  G4double halfXVoxelSizeZ = halfDetectorSizeZ;
  G4double voxelXThickness = 2*halfXVoxelSizeX;

  G4Box *RODetectorXDivision = new G4Box("RODetectorXDivision",
					 halfXVoxelSizeX,
					 halfXVoxelSizeY,
					 halfXVoxelSizeZ);
  
  G4LogicalVolume *RODetectorXDivisionLog = new G4LogicalVolume(RODetectorXDivision,
							       dummyMat,
							       "RODetectorXDivisionLog",
							       0,0,0);

  G4VPhysicalVolume *RODetectorXDivisionPhys = new G4PVReplica("RODetectorXDivisionPhys",
                                                              RODetectorXDivisionLog,
                                                              RODetectorPhys,
                                                              kXAxis,
                                                              numberOfVoxelsAlongX,
                                                              voxelXThickness);

  // Division along Y axis: the slices along the X axis are divided along the Y axis

  G4double halfYVoxelSizeX = halfXVoxelSizeX;
  G4double halfYVoxelSizeY = halfDetectorSizeY/numberOfVoxelsAlongY;
  G4double halfYVoxelSizeZ = halfDetectorSizeZ;
  G4double voxelYThickness = 2*halfYVoxelSizeY;

  G4Box *RODetectorYDivision = new G4Box("RODetectorYDivision",
					halfYVoxelSizeX, 
					halfYVoxelSizeY,
					halfYVoxelSizeZ);

  G4LogicalVolume *RODetectorYDivisionLog = new G4LogicalVolume(RODetectorYDivision,
							       dummyMat,
							       "RODetectorYDivisionLog",
							       0,0,0);
 
  G4VPhysicalVolume *RODetectorYDivisionPhys = new G4PVReplica("RODetectorYDivisionPhys",
							      RODetectorYDivisionLog,
							      RODetectorXDivisionPhys,
							      kYAxis,
							      numberOfVoxelsAlongY,
							      voxelYThickness);
  
  // Division along Z axis: the slices along the Y axis are divided along the Z axis

  G4double halfZVoxelSizeX = halfXVoxelSizeX;
  G4double halfZVoxelSizeY = halfYVoxelSizeY;
  G4double halfZVoxelSizeZ = halfDetectorSizeZ/numberOfVoxelsAlongZ;
  G4double voxelZThickness = 2*halfZVoxelSizeZ;
 
  G4Box *RODetectorZDivision = new G4Box("RODetectorZDivision",
					halfZVoxelSizeX,
					halfZVoxelSizeY, 
					halfZVoxelSizeZ);
 
  G4LogicalVolume *RODetectorZDivisionLog = new G4LogicalVolume(RODetectorZDivision,
							       dummyMat,
							       "RODetectorZDivisionLog",
							       0,0,0);
 
  RODetectorZDivisionPhys = new G4PVReplica("RODetectorZDivisionPhys",
					   RODetectorZDivisionLog,
					   RODetectorYDivisionPhys,
					   kZAxis,
					   numberOfVoxelsAlongZ,
					   voxelZThickness);

  HadrontherapyDummySD *dummySD = new HadrontherapyDummySD;
  RODetectorZDivisionLog -> SetSensitiveDetector(dummySD);

  return ROWorldPhys;
}