#ifndef ALIITSUTRACKHYP_H
#define ALIITSUTRACKHYP_H

#include <TObject.h>
#include <TObjArray.h>
#include "AliKalmanTrack.h"
#include "AliITSUSeed.h"
class AliESDtrack;
class AliCluster;

// Container for track hypotheses

class AliITSUTrackHyp: public AliKalmanTrack
{
 public:
  enum {kSkip=BIT(14)};
  AliITSUTrackHyp(Int_t nlr=0);
  AliITSUTrackHyp(const AliITSUTrackHyp& src);
  AliITSUTrackHyp(const AliKalmanTrack& src);
  AliITSUTrackHyp(const AliESDtrack& src);
  AliITSUTrackHyp &operator=(const AliITSUTrackHyp &src);
  AliITSUTrackHyp &operator=(const AliESDtrack &src);
  AliITSUTrackHyp &operator=(const AliKalmanTrack &src);
  virtual ~AliITSUTrackHyp();
  //
  void               InitFrom(const AliITSUTrackHyp *src);
  Int_t              GetNLayers()        const {return fNLayers;}
  Int_t              GetNSeeds(Int_t lr) const {return fLayerSeeds[lr].GetEntriesFast();}
  AliITSUSeed*       GetSeed(Int_t lr, Int_t id) const {return (AliITSUSeed*)fLayerSeeds[lr].UncheckedAt(id);}
  AliITSUSeed*       RemoveSeed(Int_t lr, Int_t id) const {return (AliITSUSeed*)fLayerSeeds[lr].RemoveAt(id);}
  AliITSUSeed*       GetWinner()         const;
  AliESDtrack*       GetESDTrack()       const {return fESDTrack;}
  Int_t              GetITSLabel()       const {return fITSLabel;}
  AliITSUSeed*       DefineWinner(Int_t lr=0, Int_t id=0);
  void               SetWinner(AliITSUSeed* w) {fWinner = w;}
  const TObjArray*   GetLayerSeeds(Int_t lr) const {return lr<fNLayers ? &fLayerSeeds[lr] : 0;}
  void               AddSeed(AliITSUSeed* seed, Int_t lr);
  void               SetESDTrack(AliESDtrack* esdtr) {fESDTrack = esdtr;}
  void               SetITSLabel(Int_t lb)    {fITSLabel=lb;}
  Int_t              FetchClusterInfo(Int_t* clIDarr) const;
  //
  void               SetChi2(Double_t chi2) {fChi2 = chi2;}
  Double_t           Update(const AliCluster* c);
  Bool_t             Update(Double_t p[2],Double_t cov[3])                  {return AliExternalTrackParam::Update(p,cov);}
  Double_t           GetPredictedChi2(Double_t p[2],Double_t cov[3])  const {return AliExternalTrackParam::GetPredictedChi2(p,cov);}
  Double_t           GetPredictedChi2(const AliExternalTrackParam *t) const {return AliExternalTrackParam::GetPredictedChi2(t);}
  AliExternalTrackParam* GetTPCSeed() const {return fTPCSeed;}
  void               SetTPCSeed(AliExternalTrackParam* seed) {fTPCSeed = seed;}
  //
  virtual Double_t   GetPredictedChi2(const AliCluster *c) const;
  
  virtual Bool_t     PropagateTo(Double_t xr, Double_t x0, Double_t rho);
  virtual Bool_t     Update(const AliCluster* c, Double_t chi2, Int_t index);
  virtual Int_t      GetNumberOfClusters()   const;
  virtual Int_t      GetClusterIndex(Int_t ind)  const;
  //  virtual Int_t      GetTrackletIndex(Int_t) const { return -1;}
  virtual Double_t   GetPIDsignal()          const { return 0;}
  //
  virtual void       Print(Option_t* option = "") const;
  //
  Bool_t             GetSkip()               const {return TestBit(kSkip);}
  void               SetSkip(Bool_t v=kTRUE)       {SetBit(kSkip,v);}
  //
 protected:
  UChar_t          fNLayers;               // number of layers
  Int_t            fITSLabel;              // ITS MC Label, the global one (wrt TPC) is fLab
  AliESDtrack*     fESDTrack;              // reference esd track
  AliITSUSeed*     fWinner;                // winner seed
  AliExternalTrackParam* fTPCSeed;         // kinematics of TPC track at outer radius
  TObjArray*       fLayerSeeds;            // seeds of given layer
  //
  ClassDef(AliITSUTrackHyp,1)
};

//___________________________________________________________________
inline void AliITSUTrackHyp::AddSeed(AliITSUSeed* seed, Int_t lr) 
{
  // add seed to hypothesis
  fLayerSeeds[lr].AddLast(seed);
  AliITSUSeed* par = (AliITSUSeed*)seed->GetParent();
  if (par) par->IncChildren();
}

#endif