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//
/// \file ExUCN.cc
/// \brief Main program of the exoticphysics/ucn example

#ifndef WIN32
#  include <unistd.h>
#endif

#include "ExUCNActionInitialization.hh"
#include "ExUCNDetectorConstruction.hh"
#include "ExUCNPhysicsList.hh"

#include "G4RunManagerFactory.hh"
#include "G4Types.hh"
#include "G4UIExecutive.hh"
#include "G4UIcommand.hh"
#include "G4UImanager.hh"
#include "G4VisExecutive.hh"
#include "Randomize.hh"

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namespace
{
void PrintUsage()
{
  G4cerr << " Usage: " << G4endl;
  G4cerr << " ExUCN [-m macro ] [-u UIsession] [-t nThreads] [-r seed] " << G4endl;
  G4cerr << "   note: -t option is available only for multi-threaded mode." << G4endl;
}
}  // namespace

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int main(int argc, char** argv)
{
  // Evaluate arguments
  //
  if (argc > 9) {
    PrintUsage();
    return 1;
  }

  G4String macro;
  G4String session;
  G4int nThreads = 0;

  G4long myseed = 1234;
  for (G4int i = 1; i < argc; i = i + 2) {
    if (G4String(argv[i]) == "-m")
      macro = argv[i + 1];
    else if (G4String(argv[i]) == "-u")
      session = argv[i + 1];
    else if (G4String(argv[i]) == "-r")
      myseed = atoi(argv[i + 1]);
    else if (G4String(argv[i]) == "-t") {
      nThreads = G4UIcommand::ConvertToInt(argv[i + 1]);
    }
    else {
      PrintUsage();
      return 1;
    }
  }

  // Instantiate G4UIExecutive if interactive mode
  G4UIExecutive* ui = nullptr;
  if (argc == 1) {
    ui = new G4UIExecutive(argc, argv);
  }

  // Choose the Random engine
  //
  G4Random::setTheEngine(new CLHEP::RanecuEngine);

  // Construct the default run manager
  //
  auto* runManager = G4RunManagerFactory::CreateRunManager();
  if (nThreads > 0) runManager->SetNumberOfThreads(nThreads);

  // Seed the random number generator manually
  G4Random::setTheSeed(myseed);

  // Set mandatory initialization classes
  //
  // Detector construction
  runManager->SetUserInitialization(new ExUCNDetectorConstruction());
  // Physics list
  runManager->SetUserInitialization(new ExUCNPhysicsList());
  // User action initialization
  runManager->SetUserInitialization(new ExUCNActionInitialization());

  // Initialize G4 kernel
  //
  runManager->Initialize();

  // Initialize visualization
  //
  G4VisManager* visManager = new G4VisExecutive;
  // G4VisExecutive can take a verbosity argument - see /vis/verbose guidance.
  // G4VisManager* visManager = new G4VisExecutive("Quiet");
  visManager->Initialize();

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

  if (macro.size()) {
    // batch mode
    G4String command = "/control/execute ";
    UImanager->ApplyCommand(command + macro);
  }
  else {  // interactive mode : define UI session
    UImanager->ApplyCommand("/control/execute vis.mac");
    if (ui->IsGUI()) UImanager->ApplyCommand("/control/execute gui.mac");
    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;
}

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