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// $Id: DetectorConstruction.cc,v 1.2 2006/06/29 16:43:00 gunter Exp $
// GEANT4 tag $Name: geant4-09-03-cand-01 $
//
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#include "DetectorConstruction.hh"
#include "DetectorMessenger.hh"

#include "G4NistManager.hh"
#include "G4Sphere.hh"
#include "G4LogicalVolume.hh"
#include "G4VPhysicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4PVReplica.hh"
#include "G4UniformMagField.hh"

#include "G4GeometryManager.hh"
#include "G4PhysicalVolumeStore.hh"
#include "G4LogicalVolumeStore.hh"
#include "G4SolidStore.hh"

#include "G4UnitsTable.hh"

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DetectorConstruction::DetectorConstruction()
{
  // default parameter values
  absorRadius = 3*cm;
  nbOfLayers = 1;
  
  absorMaterial = 0;
  magField = 0;
  pAbsor   = 0;
  
  DefineMaterials();
  SetMaterial("G4_WATER");

  // create commands for interactive definition of the detector  
  detectorMessenger = new DetectorMessenger(this);
}

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DetectorConstruction::~DetectorConstruction()
{ delete detectorMessenger;}

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G4VPhysicalVolume* DetectorConstruction::Construct()
{
  return ConstructVolumes();
}

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void DetectorConstruction::DefineMaterials()
{ 
  G4NistManager* man = G4NistManager::Instance();
  
  G4bool isotopes = false;
  
  man->FindOrBuildMaterial("G4_Al", isotopes);
  man->FindOrBuildMaterial("G4_Si", isotopes);
  man->FindOrBuildMaterial("G4_Fe", isotopes);
  man->FindOrBuildMaterial("G4_Ge", isotopes);
  man->FindOrBuildMaterial("G4_W" , isotopes);
  man->FindOrBuildMaterial("G4_Pb", isotopes);
  
  man->FindOrBuildMaterial("G4_AIR"  , isotopes);
  man->FindOrBuildMaterial("G4_WATER", isotopes);

 G4cout << *(G4Material::GetMaterialTable()) << G4endl;
}

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G4VPhysicalVolume* DetectorConstruction::ConstructVolumes()
{
  G4GeometryManager::GetInstance()->OpenGeometry();
  G4PhysicalVolumeStore::GetInstance()->Clean();
  G4LogicalVolumeStore::GetInstance()->Clean();
  G4SolidStore::GetInstance()->Clean();
		   
  // Absorber
  //
  G4Sphere* 
  sAbsor = new G4Sphere("Absorber",			//name
    		 0., absorRadius, 0., twopi, 0., pi);	//size

  G4LogicalVolume*
  lAbsor = new G4LogicalVolume(sAbsor,			//solid
      			       absorMaterial,		//material
      			      "Absorber");		//name
				   
  pAbsor = new G4PVPlacement(0,				//no rotation
                             G4ThreeVector(),		//at (0,0,0)
                             lAbsor,			//logical volume
                            "Absorber",			//name
                             0,				//mother  volume
                             false,			//no boolean operation
                             0);			//copy number

  // Layers
  //
  layerThickness = absorRadius/nbOfLayers;
                        
  for (G4int i=1; i<=nbOfLayers; i++) {			   
    G4Sphere*
    sLayer = new G4Sphere("Layer", (i-1)*layerThickness, i*layerThickness,
                          0., twopi, 0., pi);
		 
    G4LogicalVolume*		   			                      
    lLayer = new G4LogicalVolume(sLayer,		//shape
                                 absorMaterial,		//material
                                 "Layer");		//name
				 
	     new G4PVPlacement(0,			//no rotation
                               G4ThreeVector(),		//at (0,0,0)
                               lLayer,			//logical volume
                               "Layer",			//name
                               lAbsor,			//mother  volume
                               false,			//no boolean operation
                               i);			//copy number
			                           
   }			   		   

  PrintParameters();
    
  //
  //always return the root volume
  //  
  return pAbsor;
}

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void DetectorConstruction::PrintParameters()
{
  G4cout << "\n---------------------------------------------------------\n";
  G4cout << "---> The Absorber is a sphere of " 
         << G4BestUnit(absorRadius,"Length") << " radius of "
         << absorMaterial->GetName() << " divided in " << nbOfLayers 
	 << " slices of " << G4BestUnit(layerThickness,"Length") << G4endl;
  G4cout << "\n---------------------------------------------------------\n";
}

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void DetectorConstruction::SetRadius(G4double value)
{
  absorRadius = value;
}

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void DetectorConstruction::SetMaterial(G4String materialChoice)
{
  // search the material by its name   
  G4Material* pttoMaterial = G4Material::GetMaterial(materialChoice);     
  if (pttoMaterial) absorMaterial = pttoMaterial;
}

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void DetectorConstruction::SetNbOfLayers(G4int value)
{
  nbOfLayers = value; 
}
 
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#include "G4FieldManager.hh"
#include "G4TransportationManager.hh"

void DetectorConstruction::SetMagField(G4double fieldValue)
{
  //apply a global uniform magnetic field along Z axis
  G4FieldManager* fieldMgr 
   = G4TransportationManager::GetTransportationManager()->GetFieldManager();
    
  if (magField) delete magField;	//delete the existing magn field
  
  if (fieldValue!=0.)			// create a new one if non nul
    {
      magField = new G4UniformMagField(G4ThreeVector(0.,0.,fieldValue));        
      fieldMgr->SetDetectorField(magField);
      fieldMgr->CreateChordFinder(magField);
    }
   else
    {
      magField = 0;
      fieldMgr->SetDetectorField(magField);
    }
}

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#include "G4RunManager.hh" 
 
void DetectorConstruction::UpdateGeometry()
{
G4RunManager::GetRunManager()->DefineWorldVolume(ConstructVolumes());
}

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