/** CbmLitGating.h
 * @author Andrey Lebedev <andrey.lebedev@gsi.de>
 * @since 2008
 * @version 1.0
 *
 * Class implements validation gate technique.
 * It optionally use fast search of hits.
 **/

#ifndef CBMLITGATING_H_
#define CBMLITGATING_H_

#include "base/CbmLitTypes.h"
#include "base/CbmLitEnums.h"

class CbmLitTrackParam;
class CbmLitHit;
class CbmLitStation;

class CbmLitGating
{
public:
   /* Constructor */
   CbmLitGating();

   /* Destructor */
   virtual ~CbmLitGating();

   /* Returns true if hit is in validation gate */
   bool IsHitInValidationGate(
      const CbmLitHit* hit,
      litfloat chiSq,
      const CbmLitTrackParam* par) const;

   /* Returns pair of hit iterators which define maximum and
    * minimum possible size of the validation gate.
    * It is used in the fast hit search algorithm. */
   HitPtrIteratorPair MinMaxIndex(
      const CbmLitTrackParam* par,
      HitPtrIteratorPair hits,
      const CbmLitStation& station,
      const std::pair<litfloat, char>& maxErr) const;

   /* Sets sigma value */
   void SetSigmaCoef(litfloat sigmaCoef) { fSigmaCoef = sigmaCoef;}

   /* Sets chi-square cut for strip hits */
   void SetChiSqStripHitCut(litfloat chiSqStripHitCut) { fChiSqStripHitCut = chiSqStripHitCut;}

   /* Sets chi-square cut for pixel hits */
   void SetChiSqPixelHitCut(litfloat chiSqPixelHitCut) { fChiSqPixelHitCut = chiSqPixelHitCut;}

   /* Set use fast hit search */
   void IsUseFastSearch(bool useFastSearch) { fUseFastSearch = useFastSearch;}

   /* Returns sigma value */
   litfloat GetSigmaCoef() const { return fSigmaCoef;}

   /* Returns chi-square cut for strip hits */
   litfloat GetChiSqStripHitCut() const { return fChiSqStripHitCut;}

   /* Returns chi-square cut for pixel hits */
   litfloat GetChiSqPixelHitCut() const { return fChiSqPixelHitCut;}

   /* Set use fast hit search */
   bool IsUseFastSearch() const { return fUseFastSearch;}

protected:
   /* Chi-square cut for strip hits */
   litfloat fChiSqStripHitCut;
   /* Chi-square cut for pixel hits */
   litfloat fChiSqPixelHitCut;
   /* If true than fast search of hits will be used */
   bool fUseFastSearch;
   /* Sigma coefficient for fast hit search */
   litfloat fSigmaCoef;
   /* Maximum squared position error */
   litfloat fMaxCovSq;
};

#endif /* CBMLITGATING_H_ */