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//
/// \file DetectorConstruction.cc
/// \brief Detector Construction for a DNA molecule in a cell

#include "DetectorConstruction.hh"

#include "DNAGeometry.hh"
#include "DetectorMessenger.hh"
#include "OctreeNode.hh"

#include "G4Box.hh"
#include "G4Color.hh"
#include "G4Ellipsoid.hh"
#include "G4LogicalVolume.hh"
#include "G4NistManager.hh"
#include "G4PVPlacement.hh"
#include "G4SDManager.hh"
#include "G4VPhysicalVolume.hh"
#include "G4VisAttributes.hh"

#include <fstream>

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DetectorConstruction::DetectorConstruction(G4int vis)
  : fpDNAGeometry(new DNAGeometry()), fpDetectorMessenger(new DetectorMessenger(this))
{
  if (vis == 1) {
    RegisterParallelWorld(fpDNAGeometry->GetDNAWorld());
  }
}

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

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G4VPhysicalVolume* DetectorConstruction::Construct()
{
  BuildMaterials();
  return ConstructDetector();
}

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void DetectorConstruction::BuildMaterials()
{
  G4NistManager* man = G4NistManager::Instance();
  fpWorld = man->FindOrBuildMaterial("G4_Galactic");
  fpWater = man->FindOrBuildMaterial("G4_WATER");
}

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G4VPhysicalVolume* DetectorConstruction::ConstructDetector()
{
  //////////////////////////////////////////////////////////////////////////////
  // Brief :: Build the detector. This real world for only chemistry stage only.
  // An other parallel world is built in DNAWorld for only physics We either
  // build a DNA region inside a cell if fCellRadius is se in macro file, or we
  // just run the experiment in the World if it isn't. If we run in a cell, the
  // world material is a vacuum, and the cell is water. Otherwise everything is
  // water.
  //////////////////////////////////////////////////////////////////////////////

  G4LogicalVolume* pDnaRegionLogical;

  G4double dnasx = fCellRadius.getX();
  G4double dnasy = fCellRadius.getY();
  G4double dnasz = fCellRadius.getZ();
  if ((dnasx <= 0) || (dnasy <= 0) || (dnasz <= 0)) {
    // Experiment in the world only
    G4cout << "No cell radius has been specified (or the radii are less than 0)." << G4endl;
    G4cout << "This will fill the entire world with water" << G4endl;

    G4double wsize = 1.01 * fWorldSideLength / 2.;
    auto worldPhysical = new G4Box("WorldPhysical", wsize, wsize, wsize);
    auto worldLogical = new G4LogicalVolume(worldPhysical, fpWater, "world");
    fWorld = new G4PVPlacement(nullptr, G4ThreeVector(0), worldLogical, "world", nullptr, false, 0);
    pDnaRegionLogical = worldLogical;
  }
  else {
    // experiment inside a cell.
    G4double wsize = 1.01 * fWorldSideLength / 2.;
    auto worldPhysical = new G4Box("WorldPhysical", wsize, wsize, wsize);
    auto worldLogical = new G4LogicalVolume(worldPhysical, fpWorld, "world");

    fWorld = new G4PVPlacement(nullptr, G4ThreeVector(0), worldLogical, "world", nullptr, false, 0);
    auto dnaPhysical = new G4Ellipsoid("CellPhysical", dnasx, dnasy, dnasz);
    auto dnaLogical = new G4LogicalVolume(dnaPhysical, fpWater, "CellLogical");

    new G4PVPlacement(nullptr, G4ThreeVector(0), "CellVolume", dnaLogical, fWorld, false, 0, false);
    pDnaRegionLogical = dnaLogical;
  }
  // we build DNA geometry for physical stage
  this->GetDNAGeometry()->BuildDNA(pDnaRegionLogical);
  return fWorld;
}

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