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/// \file factory.cc
/// \brief Main program of the physicslists/factory example

// -------------------------------------------------------------
//      factory
//
//  Application demonstrating the usage of G4PhysListFactory
//  to build the concrete physics list
//
//  Modified from hadronic/Hadr00/Hadr00.cc
//     Author: V.Ivanchenko 20 June 2008
// -------------------------------------------------------------
//
//
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#include "ActionInitialization.hh"
#include "DetectorConstruction.hh"
#include "PrimaryGeneratorAction.hh"

#include "G4PhysListFactory.hh"
#include "G4RunManagerFactory.hh"
#include "G4UIExecutive.hh"
#include "G4UImanager.hh"
#include "G4VModularPhysicsList.hh"
#include "G4VisExecutive.hh"
#include "Randomize.hh"

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

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

  G4String macro;
  G4String session;
  G4String physListName;
  G4String gdmlFileName;
#ifdef G4MULTITHREADED
  G4int nofThreads = 0;
#endif
  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]) == "-p")
      physListName = argv[i + 1];
#ifdef G4MULTITHREADED
    else if (G4String(argv[i]) == "-t") {
      nofThreads = G4UIcommand::ConvertToInt(argv[i + 1]);
    }
#endif
    else {
      PrintUsage();
      return 1;
    }
  }

  // Detect interactive mode (if no arguments) and define UI session
  //
  G4UIExecutive* ui = nullptr;
  if (!macro.size()) {
    ui = new G4UIExecutive(argc, argv, session);
  }

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

  // Construct the run manager
  auto* runManager = G4RunManagerFactory::CreateRunManager();
#ifdef G4MULTITHREADED
  if (nofThreads > 0) {
    runManager->SetNumberOfThreads(nofThreads);
  }
#endif

  // Physics list factory
  G4PhysListFactory factory;
  G4VModularPhysicsList* physList = nullptr;

  // Get physics list name
  if (!physListName.size()) {
    // Physics List is defined via environment variable PHYSLIST
    char* physListNameEnv = std::getenv("PHYSLIST");
    if (physListNameEnv) {
      physListName = G4String(physListNameEnv);
    }
  }

  // Check if the name is known to the factory
  if (physListName.size() && (!factory.IsReferencePhysList(physListName))) {
    G4cerr << "Physics list " << physListName << " is not available in PhysListFactory." << G4endl;
    physListName.clear();
  }

  // If name is not defined use FTFP_BERT
  if (!physListName.size()) {
    physListName = "FTFP_BERT";
  }

  // Reference PhysicsList via its name
  physList = factory.GetReferencePhysList(physListName);

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

  // set user action classes
  runManager->SetUserInitialization(new ActionInitialization("factory"));

  // 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 init_vis.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;
}

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