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/// \file hadronic/Hadr01/Hadr01.cc
/// \brief Main program of the hadronic/Hadr01 example
//
//
// $Id: Hadr01.cc 101216 2016-11-09 13:54:13Z gcosmo $
//
// -------------------------------------------------------------
//      GEANT4 Hadr01
//
//  Application demonstrating Geant4 hadronic physics:
//  beam interaction with a target
//
//  Authors: A.Bagulya, I.Gudowska, V.Ivanchenko, N.Starkov
//
//  Modified: 
//  29.12.2009 V.Ivanchenko introduced access to reference PhysLists
//
// -------------------------------------------------------------
//
//
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#include "G4RunManager.hh"
#include "G4UImanager.hh"
#include "Randomize.hh"

#include "DetectorConstruction.hh"
#include "PhysicsList.hh"
#include "G4PhysListFactory.hh"
#include "G4VModularPhysicsList.hh"
#include "PrimaryGeneratorAction.hh"
#include "PhysicsListMessenger.hh"

#include "RunAction.hh"
#include "EventAction.hh"
#include "StackingAction.hh"

#ifdef G4VIS_USE
#include "G4VisExecutive.hh"
#endif

#ifdef G4UI_USE
#include "G4UIExecutive.hh"
#endif

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int main(int argc,char** argv) {

  //choose the Random engine
  CLHEP::HepRandom::setTheEngine(new CLHEP::RanecuEngine());

  //Construct the default run manager
  G4RunManager * runManager = new G4RunManager();

  //set mandatory initialization classes
  runManager->SetUserInitialization(new DetectorConstruction());

  G4PhysListFactory factory;
  G4VModularPhysicsList* phys = nullptr;
  PhysicsListMessenger* mess = nullptr;
  G4String physName = "";

  // Physics List name defined via 3nd argument
  if (argc==3) { physName = argv[2]; }

  // Physics List name defined via environment variable
  if("" == physName) {
    char* path = getenv("PHYSLIST");
    if (path) { physName = G4String(path); }
  }

  // reference PhysicsList via its name
  if("" != physName && factory.IsReferencePhysList(physName)) {
    phys = factory.GetReferencePhysList(physName);

    // instantiated messenger
    mess = new PhysicsListMessenger();
  } 

  // local Physics List
  if(!phys) { phys = new PhysicsList(); }

  // define physics
  runManager->SetUserInitialization(phys);
  runManager->SetUserAction(new PrimaryGeneratorAction());

  //set user action classes
  runManager->SetUserAction(new RunAction());
  runManager->SetUserAction(new EventAction());
  runManager->SetUserAction(new StackingAction());

  //get the pointer to the User Interface manager
  G4UImanager* UImanager = G4UImanager::GetUIpointer();
#ifdef G4VIS_USE
   G4VisManager* visManager = nullptr;
#endif

  if (argc==1)   // Define UI terminal for interactive mode
    {
#ifdef G4VIS_USE
      //visualization manager
      visManager = new G4VisExecutive;
      visManager->Initialize();
#endif
#ifdef G4UI_USE
      G4UIExecutive* ui = new G4UIExecutive(argc, argv);
      ui->SessionStart();
      delete ui;
#endif
    }
  else           // Batch mode
    {
      G4String command = "/control/execute ";
      G4String fileName = argv[1];
      UImanager->ApplyCommand(command+fileName);
    }

  //job termination
#ifdef G4VIS_USE
  delete visManager;
#endif     
  delete runManager;
  delete mess;

  return 0;
}

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