// ******************************************************
// DecayTreeFitter Package
// We thank the original author Wouter Hulsbergen 
// (BaBar, LHCb) for providing the sources. 
// http://arxiv.org/abs/physics/0503191v1 (2005)
// Adaptation & Development for PANDA: Ralf Kliemt (2015)
// ******************************************************
#ifndef INTERNALPARTICLE_H
#define INTERNALPARTICLE_H 1

#include "ParticleBase.h"
#include <vector>
#include "Rtypes.h"

namespace DecayTreeFitter
{

  class InternalParticle : public ParticleBase
  {
  public:
    InternalParticle(RhoCandidate* bc, const ParticleBase* mother,
                     const Configuration& config) ;

    virtual int dim() const { return mother() ? 8 : 7 ; }

    virtual ErrCode initPar1(FitParams*) ;
    virtual ErrCode initPar2(FitParams*) ;
    virtual int type() const { return kInternalParticle ; }

    // parameter definition
    virtual int posIndex() const { return index()   ; }
    virtual int lenIndex() const { return mother() ? index()+3 : -1 ; }
    virtual int momIndex() const { return mother() ? index()+4 : index() + 3 ; }
    virtual bool hasEnergy() const { return true ; }
    virtual bool hasPosition() const { return true ; }
    virtual std::string parname(int index) const ;

    // constraints
    ErrCode projectKineConstraint(const FitParams*, Projection&) const ;
    ErrCode projectLifeTimeConstraint(const FitParams*, Projection&) const ;
    ErrCode projectConversionConstraint(const FitParams*,Projection& p) const ;
    ErrCode projectMassConstraintTwoBody(const FitParams* fitparams,Projection& p) const ;
    virtual ErrCode projectConstraint(Constraint::Type type, const FitParams* fitparams,Projection& p) const ;

    // some of that other stuff
    virtual void addToConstraintList(constraintlist& alist, int depth) const ;

    //bool swapMotherDaughter(FitParams* fitparams, const ParticleBase* newmother) ;

  protected:
    ErrCode initMom( FitParams* fitparams ) const ;
  private:
    bool m_lifetimeconstraint ;
    bool m_isconversion ;
    ClassDef ( InternalParticle,1 )
  } ;

}


#endif