// -------------------------------------------------------------------------
// -----                      FairMCTrack source file                   -----
// -----                  Created 03/08/04  by V. Friese               -----
// -------------------------------------------------------------------------
#include "FairMCTrack.h"

#include "FairLogger.h"

// -----   Default constructor   -------------------------------------------
FairMCTrack::FairMCTrack()
  : TObject(),
    fPdgCode(0),
    fMotherId(-1),
    fPx(0.),
    fPy(0.),
    fPz(0.),
    fStartX(0.),
    fStartY(0.),
    fStartZ(0.),
    fStartT(0.),
    fNPoints(0)
{
}
// -------------------------------------------------------------------------



// -----   Standard constructor   ------------------------------------------
FairMCTrack::FairMCTrack(Int_t pdgCode, Int_t motherId, Double_t px,
                         Double_t py, Double_t pz, Double_t x, Double_t y,
                         Double_t z, Double_t t, Int_t nPoints = 0)
  : TObject(),
    fPdgCode(pdgCode),
    fMotherId(motherId),
    fPx(px),
    fPy(py),
    fPz(pz),
    fStartX(x),
    fStartY(y),
    fStartZ(z),
    fStartT(t),
    fNPoints(nPoints)
{
}
// -------------------------------------------------------------------------



// -----   Copy constructor   ----------------------------------------------
FairMCTrack::FairMCTrack(const FairMCTrack& track)
  : TObject(track),
    fPdgCode(track.fPdgCode),
    fMotherId(track.fMotherId),
    fPx(track.fPx),
    fPy(track.fPy),
    fPz(track.fPz),
    fStartX(track.fStartX),
    fStartY(track.fStartY),
    fStartZ(track.fStartZ),
    fStartT(track.fStartT),
    fNPoints(track.fNPoints)
{
}
// -------------------------------------------------------------------------



// -----   Constructor from TParticle   ------------------------------------
FairMCTrack::FairMCTrack(TParticle* part)
  : TObject(),
    fPdgCode(part->GetPdgCode()),
    fMotherId(part->GetMother(0)),
    fPx(part->Px()),
    fPy(part->Py()),
    fPz(part->Pz()),
    fStartX(part->Vx()),
    fStartY(part->Vy()),
    fStartZ(part->Vz()),
    fStartT(part->T()*1e09),
    fNPoints(0)
{
}
// -------------------------------------------------------------------------



// -----   Destructor   ----------------------------------------------------
FairMCTrack::~FairMCTrack() { }
// -------------------------------------------------------------------------



// -----   Public method Print   -------------------------------------------
void FairMCTrack::Print(Int_t trackId) const
{
  LOG(DEBUG) << "Track " << trackId << ", mother : " << fMotherId << ", Type "
             << fPdgCode << ", momentum (" << fPx << ", " << fPy << ", "
             << fPz << ") GeV" << FairLogger::endl;
  LOG(DEBUG2) << "       Ref " << GetNPoints(kREF)
              << ", TutDet " << GetNPoints(kTutDet)
              << ", Rutherford " << GetNPoints(kFairRutherford)
              << FairLogger::endl;
}
// -------------------------------------------------------------------------



// -----   Public method GetMass   -----------------------------------------
Double_t FairMCTrack::GetMass() const
{
  if ( TDatabasePDG::Instance() ) {
    TParticlePDG* particle = TDatabasePDG::Instance()->GetParticle(fPdgCode);
    if ( particle ) { return particle->Mass(); }
    else { return 0.; }
  }
  return 0.;
}
// -------------------------------------------------------------------------




// -----   Public method GetRapidity   -------------------------------------
Double_t FairMCTrack::GetRapidity() const
{
  Double_t e = GetEnergy();
  Double_t y = 0.5 * TMath::Log( (e+fPz) / (e-fPz) );
  return y;
}
// -------------------------------------------------------------------------




// -----   Public method GetNPoints   --------------------------------------
Int_t FairMCTrack::GetNPoints(DetectorId detId) const
{
  // TODO: Where does this come from
  if      ( detId == kREF  ) { return (  fNPoints &   1); }
  else if ( detId == kTutDet  ) { return ( (fNPoints & ( 7 <<  1) ) >>  1); }
  else if ( detId == kFairRutherford ) { return ( (fNPoints & (31 <<  4) ) >>  4); }
  else {
    LOG(ERROR) << "Unknown detector ID "
               << detId << FairLogger::endl;
    return 0;
  }
}
// -------------------------------------------------------------------------



// -----   Public method SetNPoints   --------------------------------------
void FairMCTrack::SetNPoints(Int_t iDet, Int_t nPoints)
{

  if ( iDet == kREF ) {
    if      ( nPoints < 0 ) { nPoints = 0; }
    else if ( nPoints > 1 ) { nPoints = 1; }
    fNPoints = ( fNPoints & ( ~ 1 ) )  |  nPoints;
  }

  else if ( iDet == kTutDet ) {
    if      ( nPoints < 0 ) { nPoints = 0; }
    else if ( nPoints > 7 ) { nPoints = 7; }
    fNPoints = ( fNPoints & ( ~ (  7 <<  1 ) ) )  |  ( nPoints <<  1 );
  }

  else if ( iDet == kFairRutherford ) {
    if      ( nPoints <  0 ) { nPoints =  0; }
    else if ( nPoints > 31 ) { nPoints = 31; }
    fNPoints = ( fNPoints & ( ~ ( 31 <<  4 ) ) )  |  ( nPoints <<  4 );
  }

  else LOG(ERROR) << "Unknown detector ID "
                    << iDet << FairLogger::endl;

}
// -------------------------------------------------------------------------












ClassImp(FairMCTrack)