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// $Id: DetectorConstruction.cc,v 1.2 2006/10/02 16:25:55 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-03-cand-01 $
//
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#include "DetectorConstruction.hh"
#include "DetectorMessenger.hh"

#include "G4Material.hh"
#include "G4Box.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"

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

#include "G4UnitsTable.hh"

#include "G4PolarizationManager.hh"
#include "G4NistManager.hh"

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DetectorConstruction::DetectorConstruction()
:pWorld(0), pBox(0), aMaterial(0)
{
  boxSizeXY = 50*mm;
  boxSizeZ = 5*mm;
  worldSize = 1.*m;
  aMaterial = 0;
  wMaterial = 0;
  SetTargetMaterial("G4_Fe");  
  SetWorldMaterial("G4_Galactic");  
  detectorMessenger = new DetectorMessenger(this);
}

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

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G4VPhysicalVolume* DetectorConstruction::Construct()
{
  // Cleanup old geometry
  G4GeometryManager::GetInstance()->OpenGeometry();
  G4PhysicalVolumeStore::GetInstance()->Clean();
  G4LogicalVolumeStore::GetInstance()->Clean();
  G4SolidStore::GetInstance()->Clean();
  
  G4PolarizationManager::GetInstance()->Clean();

  // World
  //
  G4Box*
  sWorld = new G4Box("World",					//name
                   worldSize/2,worldSize/2,worldSize/2);	//dimensions

  G4LogicalVolume*		   			                      
  lWorld = new G4LogicalVolume(sWorld,			//shape
                               wMaterial,		//material
                              "World");			//name

  pWorld = new G4PVPlacement(0,				//no rotation
  			   G4ThreeVector(),		//at (0,0,0)
                           lWorld,			//logical volume
			   "World",			//name
                           0,	       		        //mother  volume
                           false,			//no boolean operation
                           0);				//copy number
			   			   
  // Box
  //			   
  G4Box*
  sBox = new G4Box("Container",				//its name
                   boxSizeXY/2.,boxSizeXY/2.,boxSizeZ/2.);	//its dimensions
		   
  G4LogicalVolume*
  lBox = new G4LogicalVolume(sBox,			//its shape
                             aMaterial,			//its material
                             "theBox");	                //its name

  pBox = new G4PVPlacement(0,				//no rotation
  			   G4ThreeVector(),		//at (0,0,0)
                           lBox,			//its logical volume			   
                           aMaterial->GetName(),	//its name
                           lWorld,			//its mother  volume
                           false,			//no boolean operation
                           0);				//copy number

  // register logical Volume in PolarizationManager with zero polarization
  G4PolarizationManager * polMgr = G4PolarizationManager::GetInstance();
  polMgr->SetVolumePolarization(lBox,G4ThreeVector(0.,0.,0.));
			   
  PrintParameters();
  
  //always return the root volume
  //
  return pWorld;
}

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void DetectorConstruction::PrintParameters()
{
  G4cout << "\n The Box is " << G4BestUnit(boxSizeXY,"Length")
	 << " x " << G4BestUnit(boxSizeXY,"Length")
	 << " x " << G4BestUnit(boxSizeZ,"Length")
         << " of " << aMaterial->GetName() << G4endl;
}

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void DetectorConstruction::SetTargetMaterial(G4String materialChoice)
{
  // search the material by its name
  G4Material* mat =
    G4NistManager::Instance()->FindOrBuildMaterial(materialChoice);
  if (mat != aMaterial) {
    if(mat) {
      aMaterial = mat;
      UpdateGeometry();
    } else {
      G4cout << "### Warning!  Target material: <"
           << materialChoice << "> not found" << G4endl;  
    }     
  }
}

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void DetectorConstruction::SetWorldMaterial(G4String materialChoice)
{
  // search the material by its name
  G4Material* mat =
    G4NistManager::Instance()->FindOrBuildMaterial(materialChoice);
  if (mat != wMaterial) {
    if(mat) {
      wMaterial = mat;
      UpdateGeometry();
    } else {
      G4cout << "### Warning! World material: <"
           << materialChoice << "> not found" << G4endl;  
    }     
  }
}

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void DetectorConstruction::SetSizeXY(G4double value)
{
  boxSizeXY = value; 
  if (worldSize<boxSizeXY) worldSize = 1.2*boxSizeXY;
  UpdateGeometry();
}

void DetectorConstruction::SetSizeZ(G4double value)
{
  boxSizeZ = value; 
  if (worldSize<boxSizeZ) worldSize = 1.2*boxSizeZ;
  UpdateGeometry();
}

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#include "G4RunManager.hh"

void DetectorConstruction::UpdateGeometry()
{
  if (pWorld) 
    G4RunManager::GetRunManager()->DefineWorldVolume(Construct());
}

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