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// $Id: G4HEPEvtInterface.cc 70215 2013-05-27 07:27:49Z gcosmo $
//
// 
// --------------------------------------------------------------------

#include "G4HEPEvtInterface.hh"

#include "G4Types.hh"
#include "G4SystemOfUnits.hh"

#include "G4ios.hh"
#include "G4PrimaryVertex.hh"
#include "G4PrimaryParticle.hh"
#include "G4HEPEvtParticle.hh"
#include "G4Event.hh"

G4HEPEvtInterface::G4HEPEvtInterface(const char* evfile, G4int vl)
:vLevel(vl)
{
  inputFile.open((char*)evfile);
  if (inputFile.is_open()) {
    fileName = evfile;
    if(vl>0) G4cout << "G4HEPEvtInterface - " << fileName << " is open." << G4endl;
  }
  else {
    G4Exception("G4HEPEvtInterface::G4HEPEvtInterface","Event0201",FatalException,
    "G4HEPEvtInterface:: cannot open file.");
  }
  G4ThreeVector zero;
  particle_position = zero;
  particle_time = 0.0;

}
/*************************************
G4HEPEvtInterface::G4HEPEvtInterface(G4String evfile)
{
  const char* fn = evfile.data();
  inputFile.open((char*)fn);
  if (inputFile.is_open()) {
    fileName = evfile;
  }
  else {
    G4Exception("G4HEPEvtInterface::G4HEPEvtInterface","Event0201",FatalException,
    "G4HEPEvtInterface:: cannot open file.");
  }
  G4ThreeVector zero;
  particle_position = zero;
  particle_time = 0.0;
}
**************************************/
G4HEPEvtInterface::~G4HEPEvtInterface()
{;}

void G4HEPEvtInterface::GeneratePrimaryVertex(G4Event* evt)
{
  G4int NHEP = 0;  // number of entries
  if (inputFile.is_open()) {
    inputFile >> NHEP;
  }
  else {
    G4Exception("G4HEPEvtInterface::G4HEPEvtInterface","Event0201",FatalException,
    "G4HEPEvtInterface:: cannot open file.");
  }
  if( inputFile.eof() ) 
  {
    G4Exception("G4HEPEvtInterface::GeneratePrimaryVertex","Event0202",
    JustWarning,"End-Of-File : HEPEvt input file");
    return;
  }

  if(vLevel > 0)
  {
    G4cout << "G4HEPEvtInterface - reading " << NHEP << " HEPEvt particles from "
           << fileName << "." << G4endl;
  }
  for( G4int IHEP=0; IHEP<NHEP; IHEP++ )
  {
    G4int ISTHEP;   // status code
    G4int IDHEP;    // PDG code
    G4int JDAHEP1;  // first daughter
    G4int JDAHEP2;  // last daughter
    G4double PHEP1; // px in GeV
    G4double PHEP2; // py in GeV
    G4double PHEP3; // pz in GeV
    G4double PHEP5; // mass in GeV

    inputFile >> ISTHEP >> IDHEP >> JDAHEP1 >> JDAHEP2
       >> PHEP1 >> PHEP2 >> PHEP3 >> PHEP5;
    if( inputFile.eof() ) 
    {
      G4Exception("G4HEPEvtInterface::GeneratePrimaryVertex","Event0202",
        FatalException,"Unexpected End-Of-File : HEPEvt input file");
    }
    if(vLevel > 1)
    {
      G4cout << " " << ISTHEP << " " << IDHEP << " " << JDAHEP1 << " " << JDAHEP2
             << " " << PHEP1 << " " << PHEP2 << " " << PHEP3 << " " << PHEP5
             << G4endl;
    }

    // create G4PrimaryParticle object
    G4PrimaryParticle* particle 
      = new G4PrimaryParticle( IDHEP );
    particle->SetMass( PHEP5*GeV );
    particle->SetMomentum(PHEP1*GeV, PHEP2*GeV, PHEP3*GeV );

    // create G4HEPEvtParticle object
    G4HEPEvtParticle* hepParticle
      = new G4HEPEvtParticle( particle, ISTHEP, JDAHEP1, JDAHEP2 );

    // Store
    HPlist.push_back( hepParticle );
  }

  // check if there is at least one particle
  if( HPlist.size() == 0 ) return; 

  // make connection between daughter particles decayed from 
  // the same mother
  for( size_t i=0; i<HPlist.size(); i++ )
  {
    if( HPlist[i]->GetJDAHEP1() > 0 ) //  it has daughters
    {
      G4int jda1 = HPlist[i]->GetJDAHEP1()-1; // FORTRAN index starts from 1
      G4int jda2 = HPlist[i]->GetJDAHEP2()-1; // but C++ starts from 0.
      G4PrimaryParticle* mother = HPlist[i]->GetTheParticle();
      for( G4int j=jda1; j<=jda2; j++ )
      {
        G4PrimaryParticle* daughter = HPlist[j]->GetTheParticle();
        if(HPlist[j]->GetISTHEP()>0)
        {
          mother->SetDaughter( daughter );
          HPlist[j]->Done();
        }
      }
    }
  }

  // create G4PrimaryVertex object
  G4PrimaryVertex* vertex = new G4PrimaryVertex(particle_position,particle_time);

  // put initial particles to the vertex
  for( size_t ii=0; ii<HPlist.size(); ii++ )
  {
    if( HPlist[ii]->GetISTHEP() > 0 ) // ISTHEP of daughters had been 
                                       // set to negative
    {
      G4PrimaryParticle* initialParticle = HPlist[ii]->GetTheParticle();
      vertex->SetPrimary( initialParticle );
    }
  }

  // clear G4HEPEvtParticles
  //HPlist.clearAndDestroy();
  for(size_t iii=0;iii<HPlist.size();iii++)
  { delete HPlist[iii]; }
  HPlist.clear();

  // Put the vertex to G4Event object
  evt->AddPrimaryVertex( vertex );
}