//-----------------------------------------------------------
// File and Version Information:
// $Id$
//
// Description:
//      Implementation of class PndMdtRecoHit
//      see PndMdtRecoHit.h for details
//
// Environment:
//      Software developed for the PANDA Detector at FAIR.
//
// Author List:
//      Sebastian Neubert    TUM            (original author)
//      Stefano Spataro      UNITO          (adapted for MDT)
//
//
//-----------------------------------------------------------

// Panda Headers ----------------------

// This Class' Header ------------------
#include "PndMdtRecoHit.h"

// C/C++ Headers ----------------------
#include <assert.h>

// Collaborating Class Headers --------
#include "PndMdtPoint.h"
#include "PndMdtHit.h"
#include "GeaneTrackRep.h"

// Class Member definitions -----------

ClassImp(PndMdtRecoHit)

TRandom3 PndMdtRecoHit::rand(0);

PndMdtRecoHit::~PndMdtRecoHit()
{}

PndMdtRecoHit::PndMdtRecoHit()
  : SpacepointRecoHit(NparHitRep), fHit(NULL)
{}

PndMdtRecoHit::PndMdtRecoHit(double x, double y, double z,
			 double sigx, double sigy, double sigz)
  : SpacepointRecoHit(NparHitRep), fHit(NULL)
{
  fHitCoord[0][0] = x;
  fHitCoord[1][0] = y;
  fHitCoord[2][0] = z;
  
  fHitCov[0][0] = sigx*sigx;
  fHitCov[1][1] = sigy*sigy;
  fHitCov[2][2] = sigz*sigz;
}

PndMdtRecoHit::PndMdtRecoHit(const TVector3& pos,
			 const TVector3& sig,
			 bool smear)
  : SpacepointRecoHit(NparHitRep), fHit(NULL)
{
  if(!smear){
    fHitCoord[0][0] = pos.X();
    fHitCoord[1][0] = pos.Y();
    fHitCoord[2][0] = pos.Z();
  }
  else{
    fHitCoord[0][0] = rand.Gaus(pos.X(),sig.X());
    fHitCoord[1][0] = rand.Gaus(pos.Y(),sig.Y());
    fHitCoord[2][0] = rand.Gaus(pos.Z(),sig.Z());
  }
  fHitCov[0][0] = sig.X()*sig.X();
  fHitCov[1][1] = sig.Y()*sig.Y();
  fHitCov[2][2] = sig.Z()*sig.Z();
  
}

PndMdtRecoHit::PndMdtRecoHit(PndMdtPoint* point)
  : SpacepointRecoHit(NparHitRep),fHit(NULL)
{
  fHitCoord[0][0] = point->GetX();
  fHitCoord[1][0] = point->GetY();
  fHitCoord[2][0] = point->GetZ();
  // fixed errors on the monte carlo points
  fHitCov[0][0] = 0.5;
  fHitCov[1][1] = 0.5;
  fHitCov[2][2] = 0.5;
}

PndMdtRecoHit::PndMdtRecoHit(PndMdtHit* hit)
  : SpacepointRecoHit(NparHitRep)
{
  TVector3 hitpos(0,0,0);
  hit->Position(hitpos);
  fHitCoord[0][0] = hitpos.X();
  fHitCoord[1][0] = hitpos.Y();
  fHitCoord[2][0] = hitpos.Z();

  TVector3 sig(0,0,0);
  hit->PositionError(sig);
  fHitCov[0][0] = sig.X()*sig.X();
  fHitCov[1][1] = sig.Y()*sig.Y();
  fHitCov[2][2] = sig.Z()*sig.Z();

  fHit = hit;
}


GFAbsRecoHit* 
PndMdtRecoHit::clone(){
  return new PndMdtRecoHit(*this);
}


TMatrixT<double>
PndMdtRecoHit::getHMatrix(const GFAbsTrackRep* stateVector)
{
  assert(stateVector!=NULL);
  if (dynamic_cast<const GeaneTrackRep*>(stateVector) != NULL) {
    // Uses TrackParP (q/p,v',w',v,w)
    // coordinates are defined by detplane!
    TMatrixT<double> HMatrix(2,5);

    HMatrix[0][0] = 0.;
    HMatrix[0][1] = 0.;
    HMatrix[0][2] = 0.;
    HMatrix[0][3] = 1.;
    HMatrix[0][4] = 0.;

    HMatrix[1][0] = 0.;
    HMatrix[1][1] = 0.;
    HMatrix[1][2] = 0.;
    HMatrix[1][3] = 0.;
    HMatrix[1][4] = 1.;
    return HMatrix;
  }
  else {
    std::cerr << "PndMdtRecoHit can only handle state"
              << " vectors of type GeaneTrackRep-> abort" 
	      << std::endl;
    throw;
  }
 
}