// M Hentz, 2016

#include "PhysicsList.hh"
#include "PhysicsListMessenger.hh"
#include "G4ProcessManager.hh"
#include "G4Decay.hh"
#include "StepMax.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4SystemOfUnits.hh"
#include "G4RunManager.hh"
#include "G4Region.hh"
#include "G4RegionStore.hh"
#include "G4PhysListFactory.hh"
#include "G4VPhysicsConstructor.hh"

#include "G4ParallelWorldProcess.hh"

// Physic lists (contained inside the Geant4 source code,
// in the 'physicslists folder')
#include "G4HadronPhysicsQGSP_BIC.hh"
#include "G4HadronPhysicsQGSP_BIC_HP.hh"
#include "G4EmStandardPhysics_option3.hh"
#include "G4EmLivermorePhysics.hh"
#include "G4EmPenelopePhysics.hh"
#include "G4EmExtraPhysics.hh"
#include "G4StoppingPhysics.hh"
#include "G4DecayPhysics.hh"
#include "G4HadronElasticPhysics.hh"
#include "G4HadronElasticPhysicsHP.hh"
#include "G4RadioactiveDecayPhysics.hh"
#include "G4IonBinaryCascadePhysics.hh"
#include "G4DecayPhysics.hh"
#include "G4NeutronTrackingCut.hh"
#include "G4LossTableManager.hh"
#include "G4UnitsTable.hh"
#include "G4ProcessManager.hh"
#include "G4IonFluctuations.hh"
#include "G4IonParametrisedLossModel.hh"
#include "G4EmProcessOptions.hh"
#include "G4ParallelWorldPhysics.hh"
#include "G4VModularPhysicsList.hh"

PhysicsList::PhysicsList() : G4VModularPhysicsList(),
  fEmPhysicsList(0),
  fDecPhysicsList(0),
  fHadronPhys(),
  fStepMaxProcess(0),
  fMessenger(0)
{
  G4LossTableManager::Instance();
  defaultCutValue = 1.*mm;
  fCutForGamma     = defaultCutValue;
  fCutForElectron  = defaultCutValue;
  fCutForPositron  = defaultCutValue;

  fStepMaxProcess  = 0;

  fMessenger = new PhysicsListMessenger(this);

  // SetVerboseLevel(1);

  // Definition of some defaults for the physics
  // in case no physics is called by the macro file
  // EM physics
  fEmName = G4String("emstandard_opt3");
  fEmPhysicsList = new G4EmStandardPhysics_option3(1);

  // Deacy physics and all particles
  fDecPhysicsList = new G4DecayPhysics();
  fRadDecayList = new G4RadioactiveDecayPhysics();
}

PhysicsList::~PhysicsList()
{
  delete fMessenger;
  delete fEmPhysicsList;
  delete fDecPhysicsList;
  delete fRadDecayList;
  for (size_t i=0; i<fHadronPhys.size(); i++) { delete fHadronPhys[i]; }
}

void PhysicsList::ConstructParticle()
{
  fDecPhysicsList->ConstructParticle();
}

void PhysicsList::ConstructProcess()
{
  AddTransportation();
  ConstructParallelScoring();

  fEmPhysicsList->ConstructProcess();

  // decay physics list
  fDecPhysicsList->ConstructProcess();
  fRadDecayList->ConstructProcess();

  // hadronic physics lists
  for(size_t i=0; i<fHadronPhys.size(); i++) {
    fHadronPhys[i]->ConstructProcess();
  }

  // step limitation (as a full process)
  AddStepMax();
}

void PhysicsList::AddPhysicsList(const G4String& name)
{
  if (verboseLevel>1) {
    G4cout << "PhysicsList::AddPhysicsList: <" << name << ">" << G4endl;
  }

  if (name == fEmName) return;

  if (name == "standard_opt3")
  {
    fEmName = name;
    delete fEmPhysicsList;
    fEmPhysicsList = new G4EmStandardPhysics_option3();
    G4RunManager::GetRunManager() -> PhysicsHasBeenModified();
  }
  else if (name == "emlivermore")
  {
    fEmName = name;
    delete fEmPhysicsList;
    fEmPhysicsList = new G4EmLivermorePhysics();
    G4RunManager::GetRunManager()-> PhysicsHasBeenModified();
  }
  else if (name == "empenelope")
  {
    fEmName = name;
    delete fEmPhysicsList;
    fEmPhysicsList = new G4EmPenelopePhysics();
    G4RunManager::GetRunManager()-> PhysicsHasBeenModified();
  }
  else if (name == "QGSP_BIC_EMY")
  {
    AddPhysicsList("emstandard_opt3");
    fHadronPhys.push_back( new G4HadronPhysicsQGSP_BIC() );
    fHadronPhys.push_back( new G4EmExtraPhysics() );
    fHadronPhys.push_back( new G4HadronElasticPhysics() );
    fHadronPhys.push_back( new G4StoppingPhysics() );
    fHadronPhys.push_back( new G4IonBinaryCascadePhysics() );
    fHadronPhys.push_back( new G4NeutronTrackingCut() );
    G4RunManager::GetRunManager()-> PhysicsHasBeenModified();
  }
  else if (name == "QGSP_BIC_HP")
  {
    fHadronPhys.push_back( new G4HadronPhysicsQGSP_BIC_HP() );
    fHadronPhys.push_back( new G4EmExtraPhysics() );
    fHadronPhys.push_back( new G4HadronElasticPhysicsHP() );
    fHadronPhys.push_back( new G4StoppingPhysics() );
    fHadronPhys.push_back( new G4IonBinaryCascadePhysics() );
    fHadronPhys.push_back( new G4NeutronTrackingCut() );
    G4RunManager::GetRunManager()-> PhysicsHasBeenModified();
  }
  else
  {
    G4cout << "PhysicsList::AddPhysicsList: <" << name << ">"
           << " is not defined" << G4endl;
  }
}

void PhysicsList::AddStepMax()
{
  // Step limitation seen as a process
  fStepMaxProcess = new StepMax();

  theParticleIterator->reset();
//  GetParticleIterator()->reset();
  while ((*theParticleIterator)()){
    G4ParticleDefinition* particle = theParticleIterator->value();
    G4ProcessManager* pmanager = particle->GetProcessManager();

    if (fStepMaxProcess->IsApplicable(*particle) && pmanager)
      {
        pmanager ->AddDiscreteProcess(fStepMaxProcess);
      }
  }
}

void PhysicsList::SetCuts()
{
  if (verboseLevel >0) {
    G4cout << "PhysicsList::SetCuts:";
    G4cout << "CutLength : " << G4BestUnit(defaultCutValue,"Length") << G4endl;
  }

  // Set cut values for gamma at first and for e- second and next for e+,
  // because some processes for e+/e- need cut values for gamma
  SetCutValue(fCutForGamma, "gamma");
  SetCutValue(fCutForElectron, "e-");
  SetCutValue(fCutForPositron, "e+");

  if (verboseLevel>0) DumpCutValuesTable();
}

void PhysicsList::SetCutForGamma(G4double cut)
{
  fCutForGamma = cut;
  SetParticleCuts(fCutForGamma, G4Gamma::Gamma());
}

void PhysicsList::SetCutForElectron(G4double cut)
{
  fCutForElectron = cut;
  SetParticleCuts(fCutForElectron, G4Electron::Electron());
}

void PhysicsList::SetCutForPositron(G4double cut)
{
  fCutForPositron = cut;
  SetParticleCuts(fCutForPositron, G4Positron::Positron());
}

void PhysicsList::ConstructParallelScoring() {
  G4ParallelWorldProcess* theParallelWorldProcess
    = new G4ParallelWorldProcess( "ParaWorldProc" );
  theParallelWorldProcess->SetParallelWorld( "ParallelWorld" );
  theParticleIterator->reset();

  while( (*theParticleIterator)() ){
    G4ProcessManager* pmanager = theParticleIterator->value()->GetProcessManager();
    pmanager->AddProcess( theParallelWorldProcess );

    if( theParallelWorldProcess->IsAtRestRequired(theParticleIterator->value()) ){
      pmanager->SetProcessOrderingToLast( theParallelWorldProcess, idxAtRest );
    }
    pmanager->SetProcessOrdering( theParallelWorldProcess, idxAlongStep, 1 );
    pmanager->SetProcessOrderingToLast( theParallelWorldProcess, idxPostStep );
  }
}