#ifndef __JTRIGGER__JHITTOOLKIT__
#define __JTRIGGER__JHITTOOLKIT__

#include <limits>

#include "JLang/JClass.hh"
#include "km3net-dataformat/online/JDAQHit.hh"
#include "JTrigger/JHit.hh"
#include "JTrigger/JHitR0.hh"
#include "JTrigger/JCalibration.hh"


/**
 * \file
 *
 * Tools for handling different hit types.
 * \author mdejong
 */
namespace JTRIGGER {}
namespace JPP { using namespace JTRIGGER; }

namespace JTRIGGER {

  using KM3NETDAQ::JDAQHit;


  /**
   * Get calibrated time of DAQ hit.
   *
   * \param  hit        DAQ hit
   * \param  cal        calibration
   * \return            time [ns]
   */
  inline double getTime(const JDAQHit& hit, const JCalibration& cal)
  {
    return getTime(hit.getT(), cal);
  }


  /**
   * Get calibrated time-over-threshold of DAQ hit.
   *
   * \param  hit        DAQ hit
   * \param  cal        calibration
   * \return            time-over-threshold [ns]
   */
  inline double getToT(const JDAQHit& hit, const JCalibration& cal)
  {
    return getToT(hit.getToT(), cal);
  }


  /**
   * Template definition of hit toolkit.
   *
   * The specialised class should provide implementations for 
   * the methods and operators that are used by the trigger.
   */
  template<class JHit_t, bool isPrimitive = JLANG::JClass<JHit_t>::is_primitive>
  struct JHitToolkit;


  /**
   * Template specialisation of hit toolkit for JHit class.
   */
  template<>
  struct JHitToolkit<JHit, false> 
  {
    /**
     * Get toolkit.
     *
     * \return            this hit toolkit
     */
    const JHitToolkit<JHit, false>& getToolkit() const
    {
      return *this;
    }


    /**
     * Get time of hit.
     *
     * \param  hit        hit
     * \return            time of hit [ns]
     */
    static inline double getT(const JHit& hit)
    {
      return hit.getT();
    }


    /**
     * Get time-over-threshold of hit.
     *
     * \param  hit        hit
     * \return            time-over-threshold of hit [ns]
     */
    static inline double getToT(const JHit& hit)
    {
      return hit.getToT();
    }


    /**
     * Construct JHit.
     *
     * \param  hit        hit
     * \return            hit
     */
    static inline JHit getJHit(const JHit& hit)
    {
      return hit;
    }


    /**
     * Construct hit.
     *
     * \param  hit        DAQ hit
     * \param  cal        calibration
     * \return            hit
     */
    static inline JHit getHit(const JDAQHit& hit, const JCalibration& cal)
    {
      return JHit(JTRIGGER::getTime(hit, cal), JTRIGGER::getToT(hit, cal));
    }


    /**
     * Get end marker.
     *
     * \return            latest possible hit
     */
    static inline JHit getEndMarker()
    {
      return JHit(std::numeric_limits<double>::max());
    }


    /**
     * Get time difference between two hits.
     *
     * \param  first      first  hit
     * \param  second     second hit
     * \return            time second hit - time first hit [ns]
     */
    static inline double getTimeDifference(const JHit& first, const JHit& second)
    {
      return getT(second) - getT(first);
    }


    /**
     * Compare time of two hits.
     *
     * \param  first      first  hit
     * \param  second     second hit
     * \return            true if second hit later; else false
     */
    inline bool operator()(const JHit& first, const JHit& second) const
    {
      return getT(first) < getT(second);
    }


    /**
     * Join two hits.
     *
     * \param  first      first  hit
     * \param  second     second hit
     * \return            joined hit
     */
    static inline JHit join(const JHit& first, const JHit& second)
    {
      JHit hit(first);

      hit.join(second);

      return hit;
    }
  };


  /**
   * Template specialisation of hit toolkit for JDAQHit class.
   */
  template<>
  struct JHitToolkit<JDAQHit, false> 
  {
    /**
     * Get toolkit.
     *
     * \return            this hit toolkit
     */
    const JHitToolkit<JDAQHit, false>& getToolkit() const
    {
      return *this;
    }


    /**
     * Get time of hit.
     *
     * \param  hit        hit
     * \return            time of hit [ns]
     */
    static inline double getT(const JDAQHit& hit)
    {
      return hit.getT();
    }


    /**
     * Get time-over-threshold of hit.
     *
     * \param  hit        hit
     * \return            time-over-threshold of hit [ns]
     */
    static inline double getToT(const JDAQHit& hit)
    {
      return hit.getToT();
    }


    /**
     * Construct JHit.
     *
     * \param  hit        hit
     * \return            hit
     */
    static inline JHit getJHit(const JDAQHit& hit)
    {
      return JHit(hit.getT(), hit.getToT());
    }


    /**
     * Construct hit.
     *
     * \param  hit        DAQ hit
     * \param  cal        calibration
     * \return            hit
     */
    static inline JDAQHit getHit(const JDAQHit& hit, const JCalibration& cal)
    {
      return hit;
    }


    /**
     * Get end marker.
     *
     * \return            latest possible hit
     */
    static inline JDAQHit getEndMarker()
    {
      return JDAQHit(0, std::numeric_limits<JDAQHit::JTDC_t>::max(), 0);
    }


    /**
     * Get time difference between two hits.
     *
     * \param  first      first  hit
     * \param  second     second hit
     * \return            time second hit - time first hit [ns]
     */
    static inline double getTimeDifference(const JDAQHit& first, const JDAQHit& second)
    {
      return getT(second) - getT(first);
    }


    /**
     * Compare time of two hits.
     *
     * \param  first      first  hit
     * \param  second     second hit
     * \return            true if second hit later; else false
     */
    inline bool operator()(const JDAQHit& first, const JDAQHit& second) const
    {
      return getT(first) < getT(second);
    }


    /**
     * Join two hits.
     *
     * \param  first      first  hit
     * \param  second     second hit
     * \return            joined hit
     */
    static inline JHit join(const JHit& first, const JHit& second)
    {
      JHit hit(first);

      hit.join(second);

      return hit;
    }
  };


  /**
   * Template specialisation of hit toolkit for JHitR0 class.
   */
  template<>
  struct JHitToolkit<JHitR0, false> :
    public JHitToolkit<JHit, false>
  {
    /**
     * Get toolkit.
     *
     * \return            this hit toolkit
     */
    const JHitToolkit<JHit, false>& getToolkit() const
    {
      return *this;
    }


    /**
     * Construct hit.
     *
     * \param  hit        DAQ hit
     * \param  cal        calibration
     * \return            hit
     */
    static inline JHitR0 getHit(const JDAQHit& hit, const JCalibration& cal)
    {
      return JHitR0(hit.getPMT(), JHitToolkit<JHit, false>::getHit(hit, cal));
    }


    /**
     * Get end marker.
     *
     * \return            latest possible hit
     */
    static inline JHitR0 getEndMarker()
    {
      return JHitR0(0, JHitToolkit<JHit, false>::getEndMarker());
    }


    /**
     * Join two hits.
     *
     * \param  first      first  hit
     * \param  second     second hit
     * \return            joined hit
     */
    static inline JHitR0 join(const JHitR0& first, const JHitR0& second)
    {
      JHitR0 hit(first);

      hit.join(second);

      return hit;
    }
  };
  

  /**
   * Template specialisation of hit toolkit for any primitive data type.
   */
  template<class JHit_t>
  struct JHitToolkit<JHit_t, true> 
  {
    /**
     * Get toolkit.
     *
     * \return            this hit toolkit
     */
    const JHitToolkit<JHit_t, true>& getToolkit() const
    {
      return *this;
    }


    /**
     * Get time of hit.
     *
     * \param  hit        hit
     * \return            time of hit [ns]
     */
    static inline double getT(const JHit_t hit)
    {
      return hit;
    }


    /**
     * Get time-over-threshold of hit.
     *
     * \param  hit        hit
     * \return            0
     */
    static inline double getToT(const JHit_t& hit)
    {
      return 0.0;
    }


    /**
     * Construct JHit.
     *
     * \param  hit        hit
     * \return            hit
     */
    static inline JHit getJHit(const JHit_t hit)
    {
      return JHit(getT(hit), getToT(hit));
    }


    /**
     * Construct hit.
     *
     * \param  hit        DAQ hit
     * \param  cal        calibration
     * \return            hit
     */
    static inline JHit_t getHit(const JDAQHit& hit, const JCalibration& cal)
    {
      return getTime(hit, cal);
    }


    /**
     * Get end marker.
     *
     * \return            latest possible hit
     */
    static inline JHit_t getEndMarker()
    {
      return std::numeric_limits<JHit_t>::max();
    }


    /**
     * Get time difference between two hits.
     *
     * \param  first      first  hit
     * \param  second     second hit
     * \return            time second hit - time first hit [ns]
     */
    static inline JHit_t getTimeDifference(const JHit_t first, const JHit_t second)
    {
      return second - first;
    }


    /**
     * Compare time of two hits.
     *
     * \param  first      first  value [ns]
     * \param  second     second value [ns]
     * \return            true if second hit later; else false
     */
    inline bool operator()(const JHit_t first, const JHit_t second) const
    {
      return first < second;
    }


    /**
     * Join two hits.
     *
     * Note that this method returns the first hit as-is.
     *
     * \param  first      first  hit
     * \param  second     second hit
     * \return            joined hit
     */
    static inline JHit_t join(const JHit_t& first, const JHit_t& second)
    {
      return first;
    }
  };
}

#endif