#ifndef __JTRIGGER__JEVENTOVERLAP__
#define __JTRIGGER__JEVENTOVERLAP__

#include "JTrigger/JEvent.hh"


/**
 * \author mdejong
 */

namespace JTRIGGER {}
namespace JPP { using namespace JTRIGGER; }

namespace JTRIGGER {


  /**
   * Match of two events considering overlap in time.
   */
  class JEventOverlap {
  public:
    /**
     * Constructor.
     *
     * \param Tmax_ns         maximal time difference between two consecutive events [ns]
     */
    JEventOverlap(const double Tmax_ns) :
      tmax_ns(Tmax_ns)
    {}


    /**
     * Match criterion.
     *
     * \param  first          first  event
     * \param  second         second event
     * \return                true if two events overlap in time; else false 
     */
    bool operator()(const JEvent& first, const JEvent& second) const
    { 
      if (first .empty()) return false;
      if (second.empty()) return false;

      return (first.rbegin()->getT() >= second. begin()->getT() - tmax_ns - getExtraTime() &&
              first. begin()->getT() <= second.rbegin()->getT() + tmax_ns + getExtraTime());
    }


    /**
     * Get time window.
     *
     * \return                maximal time difference between two consecutive events [ns]
     */
    double getTmax() const
    {
      return tmax_ns;
    }


    /**
     * Get extra time.
     *
     * The extra time is used to accomodate small time gaps (sub-ns) due to numerical precision.
     *
     *  \return               extra time [ns]
     */
    static inline double getExtraTime()
    {
      return 0.1;
    }

  protected:
    double tmax_ns;
  };
}

#endif