#ifndef TReconTrackCand_hxx_seen
#define TReconTrackCand_hxx_seen

#include <vector>

#include <TVectorD.h>
#include <TMatrixDSym.h>

#include "IHandle.hxx"
#include "IReconBase.hxx"
#include "IReconTrack.hxx"
#include "IHit.hxx"
#include "IHitSelection.hxx"
#include "ICOMETLog.hxx"
#include "ITrackState.hxx"

namespace COMET {
    class IReconTrackCand;
}

/// A container of track candidate hits inherited from IHitSelection.
/// This conteiner should also take over the initial paramters from Track Finding to Track Fitting.
class COMET::IReconTrackCand : public COMET::IReconTrack {
public:
    IReconTrackCand();
    /// copy constructor
    IReconTrackCand(const COMET::IReconTrackCand& trackcand);

    virtual ~IReconTrackCand();

    /// Get i-th hit
    COMET::IHandle<COMET::IHit> GetHitAt(int i) const;

    /// Get the position of a track candidate
    TVector3 GetSeedPosition() const {return TVector3(GetPosition().X(), GetPosition().Y(), GetPosition().Z());}

    /// Get the momentum of a track candidate
    TVector3 GetSeedMomentum() const {return GetMomentumVector();}

    /// Get the state vector of a track candidate
    TVectorD GetSeedState() const;

    /// Get the covariance matrix of a track candidate
    TMatrixDSym GetSeedCovariance() const;

    /// List the results of in the track candidate.
    virtual void ls(Option_t* opt = "") const;
private:

    ClassDef(IReconTrackCand,1);
};
#endif