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// -------------------------------------------------------------
//      GEANT4 FF_Neutron_HP
//
//  Command line options:
//      -i ARG      : run in batch mode from script file ARG
//      -o ARG      : write output to file ARG
//                    (defaults to FF_Neutron_HP.out)
//      -n ARG      : multithreading with ARG number of threads
//                    (only works if Geant4 was compiled with
//                    multithreading enables)
//
//  =============== Begin Documentation Comments ===============
//!
//! \file       FissionFragment.cc
//! \author     B. Wendt (brycen.linn.wendt@cern.ch)
//! \date       June 06, 2014
//!
//! \brief      Main program of the FissionFragment example
//!
//! \details    Application demonstrating the Fission Fragment model as used
//!                 within the neutron_hp model. It demostrates the capability
//!                 for fission product containment by the cladding in a water
//!                 moderated sub-critical assembly.
//!             It could also be further extended to calculate the effective
//!                 multiplication factor of the subcritical assembly for
//!                 various loading schemes.
//!
//  ================ End Documentation Comments ================
//
//  Modified:
//
//  05-08-20                                              ARibon
//  Replaced deprecated HP environmental variables with UI commands
//  23-06-14                                              BWendt
//  Added check for NeutronHP fission generator environment variable
//
// -------------------------------------------------------------

#include "FFActionInitialization.hh"
#include "FFDetectorConstruction.hh"
#include "QGSP_BIC_HP.hh"

#include "G4ParticleHPManager.hh"
#include "G4RunManagerFactory.hh"
#include "G4UIExecutive.hh"
#include "G4UImanager.hh"
#include "G4VisExecutive.hh"
#include "Randomize.hh"
#include "globals.hh"

// Entry point
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
int main(int argc, char* argv[])
{
  int result;
  unsigned int numberOfThreads = 1;

  G4String scriptFileName = "";
  G4String outputFileName = "FF_Neutron_HP.out";
  G4UImanager* UIManager = NULL;

  // Activate production of fission fragments in neutronHP
  G4ParticleHPManager::GetInstance()->SetProduceFissionFragments(true);

  char Force[] = "G4FORCENUMBEROFTHREADS";
  if (std::getenv(Force) != NULL) {
    char doNotForce[] = "G4FORCENUMBEROFTHREADS=1";
    putenv(doNotForce);
  }

  // Indicate the example is starting
  G4cout << "####   Starting: " << argv[0] << "    ####" << G4endl;

  //  Parse the command line arguments, if any
  for (int i = 1; i < argc; i += 2) {
    // Ensure that this is actually a command
    if (argv[i][0] != '-') {
      G4cerr << G4endl << "!!!!" << G4endl;
      G4cerr << "!!!! Error in argument " << i + 1 << G4endl;
      G4cerr << "!!!! A command-line option was expected, but \"" << argv[i] << "\" was found"
             << G4endl;
      G4cerr << "!!!! " << argv[0] << " will now terminate" << G4endl;
      G4cerr << "!!!!" << G4endl << G4endl;

      return EXIT_FAILURE;
    }

    // Ensure that the command-line option has an associated argument
    if (!(i + 1 < argc)) {
      G4cerr << G4endl << "!!!!" << G4endl;
      G4cerr << "!!!! Error in argument " << i + 2 << G4endl;
      G4cerr << "!!!! An argument was expected, but \"" << argv[i + 1] << "\" was found" << G4endl;
      G4cerr << "!!!! Ensure that a space is used to separate the "
                "option and argument"
             << G4endl;
      G4cerr << "!!!! " << argv[0] << " will now terminate" << G4endl;
      G4cerr << "!!!!" << G4endl << G4endl;

      return EXIT_FAILURE;
    }

    switch (argv[i][1]) {
      case 'i':
        scriptFileName = "/control/execute ";
        scriptFileName.append(argv[i + 1]);
        break;

      case 'o':
        outputFileName = argv[i + 1];
        break;

      case 'n':
        result = sscanf(argv[i + 1], "%u", &numberOfThreads);
        if (result != 1) {
          G4cerr << G4endl << "!!!!" << G4endl;
          G4cerr << "!!!! Error in argument " << i + 2 << G4endl;
          G4cerr << "!!!! An positive number was expected, but \"" << argv[i + 1] << "\" was found"
                 << G4endl;
          G4cerr << "!!!! " << argv[0] << " will now terminate" << G4endl;
          G4cerr << "!!!!" << G4endl << G4endl;

          return EXIT_FAILURE;
        }
        break;

      default:
        G4cout << G4endl << "!!!!" << G4endl;
        G4cout << "!!!! Warning for command " << i + 1 << G4endl;
        G4cout << "!!!! \"" << argv[i] << "\" is not a valid command" << G4endl;
        G4cout << "!!!! " << argv[0] << " will ignore \"" << argv[i] << "\" and \"" << argv[i + 1]
               << "\"" << G4endl;
        G4cout << "!!!!" << G4endl << G4endl;
    }
  }

  // Instantiate G4UIExecutive if interactive mode
  G4UIExecutive* ui = nullptr;
  if (scriptFileName.length() == 0) {
    ui = new G4UIExecutive(argc, argv);
  }

  // Set the Random engine
  // A seed of 62737819 produced a maximum number of 67 events on the
  // author's system before timing out the nightly test
  const G4long seed = 62737819;
#ifndef NDEBUG
  G4cout << "MT RNG Seed: " << seed << G4endl;
#endif  // NDEBUG
  G4Random::setTheEngine(new CLHEP::MTwistEngine(seed));

  // Initialize the multithreaded run manager
  auto* runManager = G4RunManagerFactory::CreateRunManager();
  runManager->SetNumberOfThreads(numberOfThreads);
  G4cout << "    Threads requested:    " << numberOfThreads << G4endl;
  G4cout << "    Threads started:      " << runManager->GetNumberOfThreads() << G4endl;

  // Set mandatory initialization classes
  runManager->SetUserInitialization(new FFDetectorConstruction());
  runManager->SetUserInitialization(new QGSP_BIC_HP());
  runManager->SetUserInitialization(new FFActionInitialization());

  // Initialize the Geant4 kernel
  runManager->Initialize();

  // Initialize visualization
  G4VisManager* visManager = new G4VisExecutive();
  visManager->Initialize();

  // Get the pointer to the User Interface manager
  UIManager = G4UImanager::GetUIpointer();

  if (!ui) {
    // Batch mode
    UIManager->ApplyCommand(scriptFileName);
  }
  else {
    // Interactive mode
    ui->SessionStart();
    delete ui;
  }

  // Job termination
  // Free the store: user actions, physics_list and detector_description are
  // owned and deleted by the run manager, so they should not be deleted
  // in the main() program !
  delete visManager;
  delete runManager;

  return 0;
}