// $Id$
//
//    File: DTrack_factory.h
// Created: Wed Sep  3 09:33:40 EDT 2008
// Creator: davidl (on Darwin harriet.jlab.org 8.11.1 i386)
//

#ifndef _DTrack_factory_
#define _DTrack_factory_

#include <JANA/JFactory.h>
#include <JANA/JObject.h>

#include <TRACKING/DTrackFitter.h>
#include <TRACKING/DTrackHitSelector.h>

class DTrackCandidate;

#include "DTrack.h"

///////////////////////////////////////////////////////////////////////
/// The DTrack_factory class coordinates the fitting of wire-based
/// tracks. While the hit selection is done here, the actual heavy
/// lifting of the fit is done by the DTrackFitter class (or, more
/// specifically, a class that inherits from DTrackFitter).
///
/// This grabs a DTrackFitter object using the default Tag through JANA
/// and uses it to fit the DTrackCandidate objects which it grabs
/// also using the default Tag.
/// 
/// The DTrack objects are wire-based tracks (no drift time information
/// is used). As such, this is hardwired to set the fit type for the
/// DTrackFitter to kWireBased. See the DParticle classes for the
/// time-based counterpart.
///
/// This may appear uneccessarily complex, but it provides for using the
/// exact same code for fitting both wire-based and time-based tracks
/// as well as allowing a lot of flexibility in swapping out the 
/// DTrackFitter class used by both the wire-based and time-based 
/// stages using the same DEFTAG mechanism used by the rest of JANA.
///////////////////////////////////////////////////////////////////////

class DTrack_factory:public jana::JFactory<DTrack>{
	public:
		DTrack_factory(){};
		~DTrack_factory(){};


	private:
		jerror_t init(void);						///< Called once at program start.
		jerror_t brun(jana::JEventLoop *loop, int runnumber);	///< Called everytime a new run number is detected.
		jerror_t evnt(jana::JEventLoop *loop, int eventnumber);	///< Called every event.
		jerror_t erun(void);						///< Called everytime run number changes, provided brun has been called.
		jerror_t fini(void);						///< Called after last event of last event source has been processed.

		double DEFAULT_MASS;
		DTrackFitter *fitter;
		const DTrackHitSelector *hitselector;
		vector<DReferenceTrajectory*> rtv;
		DCoordinateSystem *target;

		jerror_t CorrectCandidateForELoss(const DTrackCandidate *candidate, DReferenceTrajectory *rt, DVector3 &pos, DVector3 &mom);
		void MakeDTrack(const DTrackCandidate *candidate);
		
};

#endif // _DTrack_factory_