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/// \file medical/fanoCavity2/src/DetectorConstruction.cc
/// \brief Implementation of the DetectorConstruction class
//

//
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#include "DetectorConstruction.hh"
#include "DetectorMessenger.hh"

#include "G4Material.hh"
#include "G4Tubs.hh"
#include "G4LogicalVolume.hh"
#include "G4VPhysicalVolume.hh"
#include "G4PVPlacement.hh"

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

#include "G4UnitsTable.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"

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DetectorConstruction::DetectorConstruction()
:fWallMaterial(0),fWall(0),fCavityMaterial(0),fCavity(0),fDetectorMessenger(0)
{
  // default parameter values
  fWallThickness   = 5*cm;  
  fCavityThickness = 2*mm;
  fWorldRadius     = 10*m;    
  
  DefineMaterials();
  SetWallMaterial("Water");
  
  // create commands for interactive definition of the detector  
  fDetectorMessenger = new DetectorMessenger(this);
}

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

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

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void DetectorConstruction::DefineMaterials()
{  
//   //
//   // define Elements - based on a full description of elements and materials
//   //
//   G4double z,a;
  
//   G4Element* H  = new G4Element("Hydrogen" ,"H" , z= 1., a=   1.01*g/mole);
//   G4Element* O  = new G4Element("Oxygen"   ,"O" , z= 8., a=  16.00*g/mole);

//   //
//   // define materials
//   //  
//   G4Material* H2O = 
//   new G4Material("Water", 1.0*g/cm3, 2);
//   H2O->AddElement(H, 2);
//   H2O->AddElement(O, 1);
//   H2O->GetIonisation()->SetMeanExcitationEnergy(78.0*eV);
  
//   G4Material* gas = 
//   new G4Material("Water_gas", 1.0*mg/cm3, 2);
//   gas->AddElement(H, 2);
//   gas->AddElement(O, 1);
//   gas->GetIonisation()->SetMeanExcitationEnergy(78.0*eV);
  
//   new G4Material("Graphite",     6, 12.01*g/mole, 2.265*g/cm3);
//   new G4Material("Graphite_gas", 6, 12.01*g/mole, 2.265*mg/cm3);  
  
//   new G4Material("Aluminium",     13, 26.98*g/mole, 2.700*g/cm3);
//   new G4Material("Aluminium_gas", 13, 26.98*g/mole, 2.700*mg/cm3);  

  // define Elements - using NIST material database
   
  G4Material* H2O = G4NistManager::Instance()->FindOrBuildMaterial("G4_WATER");
  H2O->SetName("Water");
  H2O->GetIonisation()->SetMeanExcitationEnergy(78.0*eV);

  G4Material* gas = G4NistManager::Instance()->BuildMaterialWithNewDensity(
                       "Water_gas","G4_WATER_VAPOR", 1.0*mg/cm3);
  gas->GetIonisation()->SetMeanExcitationEnergy(78.0*eV);

  G4Material* Air = G4NistManager::Instance()->FindOrBuildMaterial("G4_AIR");
  Air->SetName("Air");
  
  G4NistManager::Instance()->BuildMaterialWithNewDensity("Graphite", 
                                                         "G4_GRAPHITE", 
                                                         2.265*g/cm3);
  G4NistManager::Instance()->BuildMaterialWithNewDensity("Graphite_gas", 
                                                         "G4_GRAPHITE", 
                                                         2.265*mg/cm3);
  
  G4NistManager::Instance()->BuildMaterialWithNewDensity("Aluminium", "G4_Al",
                                                         2.7*g/cm3);
  G4NistManager::Instance()->BuildMaterialWithNewDensity("Aluminium_gas", 
                                                         "G4_Al", 2.7*mg/cm3);

       



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

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G4VPhysicalVolume* DetectorConstruction::ConstructVolumes()
{
  G4GeometryManager::GetInstance()->OpenGeometry();
  G4PhysicalVolumeStore::GetInstance()->Clean();
  G4LogicalVolumeStore::GetInstance()->Clean();
  G4SolidStore::GetInstance()->Clean();
                   
  // Wall
  //
  fWorldThickness = fCavityThickness + 2*fWallThickness;
  
  G4Tubs* 
  sWall = new G4Tubs("Wall",                                         //name
                      0.,fWorldRadius,0.5*fWorldThickness,0.,twopi); //size

  G4LogicalVolume*
  lWall = new G4LogicalVolume(sWall,                   //solid
                              fWallMaterial,           //material
                              "Wall");                 //name
                                   
  fWall = new G4PVPlacement(0,                         //no rotation
                            G4ThreeVector(),           //at (0,0,0)
                            lWall,                     //logical volume
                            "Wall",                    //name
                            0,                         //mother  volume
                            false,                     //no boolean operation
                            0);                        //copy number

  // Cavity
  //                             
  G4Tubs*
  sCavity = new G4Tubs("Cavity",        
                       0.,fWorldRadius,0.5*fCavityThickness,0.,twopi);
                 
  G4LogicalVolume*
  lCavity = new G4LogicalVolume(sCavity,               //shape
                                fCavityMaterial,       //material
                                "Cavity");             //name
                                
  fCavity = new G4PVPlacement(0,                       //no rotation
                             G4ThreeVector(),          //at (0,0,0)
                             lCavity,                  //logical volume
                             "Cavity",                 //name
                             lWall,                    //mother  volume
                             false,                    //no boolean operation
                             1);                       //copy number
                                
  PrintParameters();
    
  //
  //always return the root volume
  //  
  return fWall;
}

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void DetectorConstruction::PrintParameters()
{
  G4cout << "\n---------------------------------------------------------\n";
  G4cout << "---> The Wall is " << G4BestUnit(fWallThickness,"Length")
         << " of " << fWallMaterial->GetName() << " ( " 
         << G4BestUnit(fWallMaterial->GetDensity(),"Volumic Mass") << " )\n";
  G4cout << "     The Cavity is " << G4BestUnit(fCavityThickness,"Length")
         << " of " << fCavityMaterial->GetName() << " ( " 
         << G4BestUnit(fCavityMaterial->GetDensity(),"Volumic Mass") << " )";
  G4cout << "\n---------------------------------------------------------\n";
  G4cout << G4endl;
}
 
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void DetectorConstruction::SetWallMaterial(G4String materialChoice)
{
  // search the material by its name   
  G4Material* pttoMaterial = G4Material::GetMaterial(materialChoice);     
  if (pttoMaterial) fWallMaterial = pttoMaterial;
  
  pttoMaterial = G4Material::GetMaterial(materialChoice + "_gas");
  if (pttoMaterial) fCavityMaterial = pttoMaterial;       
}

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void DetectorConstruction::SetWallThickness(G4double value)
{
  fWallThickness = value;
}

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void DetectorConstruction::SetCavityThickness(G4double value)
{
  fCavityThickness = value;
  
}
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void DetectorConstruction::SetWorldRadius(G4double value)
{
  fWorldRadius = value;
}
  
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#include "G4RunManager.hh" 
 
void DetectorConstruction::UpdateGeometry()
{
G4RunManager::GetRunManager()->DefineWorldVolume(ConstructVolumes());
}

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