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/// \file Hadr01.cc
/// \brief Main program of the hadronic/Hadr01 example

// -------------------------------------------------------------
//      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 "DetectorConstruction.hh"
#include "EventAction.hh"
#include "PhysicsList.hh"
#include "PrimaryGeneratorAction.hh"
#include "RunAction.hh"
#include "StackingAction.hh"

#include "G4HadronicParameters.hh"
#include "G4PhysListFactory.hh"
#include "G4RunManagerFactory.hh"
#include "G4UIExecutive.hh"
#include "G4UImanager.hh"
#include "G4VModularPhysicsList.hh"
#include "G4VisExecutive.hh"

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int main(int argc, char** argv)
{
  // detect interactive mode (if no arguments) and define UI session
  G4UIExecutive* ui = nullptr;
  if (argc == 1) {
    ui = new G4UIExecutive(argc, argv);
  }

  // Construct a serial run manager
  auto* runManager = G4RunManagerFactory::CreateRunManager(G4RunManagerType::SerialOnly);

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

  G4PhysListFactory factory;
  G4VModularPhysicsList* phys = 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 = std::getenv("PHYSLIST");
    if (nullptr != path) {
      physName = G4String(path);
    }
  }

  G4cout << "PhysicsList: " << physName << G4endl;

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

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

  // optional change of overlap cascade/string
  if (argc >= 5) {
    auto param = G4HadronicParameters::Instance();
    G4double e1 = CLHEP::GeV * std::strtod(argv[3], 0);
    G4double e2 = CLHEP::GeV * std::strtod(argv[4], 0);
    G4cout << "### Bertini/FTFP limits: e1(GeV)=" << e1 / CLHEP::GeV
           << "  e2(GeV)=" << e2 / CLHEP::GeV << G4endl;
    param->SetMinEnergyTransitionFTF_Cascade(e1);
    param->SetMaxEnergyTransitionFTF_Cascade(e2);
  }

  if (argc >= 6) {
    auto param = G4HadronicParameters::Instance();
    param->SetEnableNUDEX(true);
  }

  // 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());

  // initialize visualization
  G4VisManager* visManager = nullptr;

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

  if (ui) {
    // interactive mode
    visManager = new G4VisExecutive;
    visManager->Initialize();
    ui->SessionStart();
    delete ui;
  }
  else {
    // batch mode
    G4String command = "/control/execute ";
    G4String fileName = argv[1];
    UImanager->ApplyCommand(command + fileName);
  }

  // job termination
  delete visManager;
  delete runManager;
}

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