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/// \file DetectorConstruction.cc
/// \brief Implementation of the DetectorConstruction class
//
// 
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#include "DetectorConstruction.hh"

#include "G4NistManager.hh"
#include "G4Box.hh"
#include "G4Tubs.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4SystemOfUnits.hh"
#include "G4PhysicalConstants.hh"

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DetectorConstruction::DetectorConstruction()
 : G4VUserDetectorConstruction()
{
  fWorldSize = 2*m;
}

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DetectorConstruction::~DetectorConstruction()
{}

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G4VPhysicalVolume* DetectorConstruction::Construct()
{
///////////////////////////////////////////////////////////////
//////////////////Material Definition//////////////////////////
///////////////////////////////////////////////////////////////

  G4NistManager *man = G4NistManager::Instance();

    // Vacuum using NIST Manager //From Jin's Simulation
  G4Material* Galactic = new G4Material("Galactic", universe_mean_density, 1);
  Galactic->AddElement(man->FindOrBuildElement("H"),1);
    //Germanium for HPGe detector
  G4Material* Ge = man->FindOrBuildMaterial("G4_Ge");

///////////////////////////////////////////////////////////////
///////////////////////Volume Definition///////////////////////
///////////////////////////////////////////////////////////////

    //Define Constants
  G4double zLength = 10*cm;

    //World Volume
  G4Box* solidWorld = new G4Box("World", fWorldSize/2,fWorldSize/2,fWorldSize/2);
                   
  G4LogicalVolume* logicWorld = new G4LogicalVolume(solidWorld, Galactic, "World");

  G4VPhysicalVolume* physiWorld = new G4PVPlacement(0, G4ThreeVector(), logicWorld, "World", 0, false, 0);

    //HPGe Detector
  G4Tubs *solidDet = new G4Tubs("solidDet", 0, 20*cm, zLength, 0*deg, 360*deg);

  logicDet = new G4LogicalVolume(solidDet, Ge, "logicalDet");

  fScoringVolume = logicDet;

  G4VPhysicalVolume *physDet = new G4PVPlacement(0, G4ThreeVector(0, 0, 5*cm+zLength), logicDet, "physDet", logicWorld, false, 0, false);

  return physiWorld;
}

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