#ifndef __JACOUSTICS__JACOUSTICSTOOLKIT__
#define __JACOUSTICS__JACOUSTICSTOOLKIT__

#include <map>
#include <limits>

#include "km3net-dataformat/online/JDAQChronometer.hh"

#include "JLang/JException.hh"
#include "JLang/JPredicate.hh"

#include "JGeometry3D/JVector3D.hh"


/**
 * \file
 *
 * Acoustics toolkit.
 * \author mdejong
 */
namespace JACOUSTICS {}
namespace JPP { using namespace JACOUSTICS; }

namespace JACOUSTICS {

  using JLANG::JValueOutOfRange;
  using JLANG::JPredicate;
  using JGEOMETRY3D::JVector3D;


  /**
   * Auxiliary data structure to unify weights of acoustics data
   * according to the number of pings per emitter.
   * The default option is to unify the weights.
   */
  struct JWeight :
    public std::map<int, size_t>
  {
    /**
     * Constructor.
     *
     * \param  __begin                  begin of data
     * \param  __end                    end   of data
     */
    template<class T>
    JWeight(T __begin, T __end) :
      min(std::numeric_limits<size_t>::max())
    {
      for (T i = __begin; i != __end; ++i) {
	(*this)[i->getID()] += 1;
      }

      for (const_iterator i = this->begin(); i != this->end(); ++i) {
	if (i->second < min) {
	  min = i->second;
	}
      }
    }


    /**
     * Get option to unify weights.
     *
     * \return                          option
     */
    static bool getUnify()
    {
      return get_unify();
    }


    /**
     * Set option to unify weights.
     *
     * \param  unify                    option
     */
    static void setUnify(const bool unify)
    {
      get_unify() = unify;
    }


    /**
     * Get weight.
     *
     * \param  id                       identifier
     * \return                          weight
     */
    double operator()(const int id) const
    {
      if (getUnify()) {
	
	const_iterator p = this->find(id);

	if (p != this->end())
	  return (double) min / (double) p->second;
	else
	  THROW(JValueOutOfRange, "Invalid identifier " << id);

      } else {

	return 1.0;
      }
    }

  private:
    /**
     * Get option to unify weights.
     *
     * \return                          option
     */
    static bool& get_unify()
    {
      static bool unify = true;

      return unify;
    }

    size_t min;
  };


  /**
   * Get position from element in data which corresponds to given predicate.
   *
   * \param  __begin                  begin of data
   * \param  __end                    end   of data
   * \param  predicate                predicate
   * \return                          position
   */
  template<class T, class JTypename_t, class JComparator_t>
  inline JVector3D getPosition(T __begin,
			       T __end,
			       const JPredicate<JTypename_t, JComparator_t>& predicate)
  {
    T p = std::find_if(__begin, __end, predicate);

    if (p != __end) 
      return p->getPosition();
    else
      THROW(JValueOutOfRange, "No element in container which corresponds to given predicate.");
  }


  /**
   * Get position from element in data which corresponds to given predicate.
   *
   * \param  __begin                  begin of data
   * \param  __end                    end   of data
   * \param  predicate                predicate
   * \param  position                 default position
   * \return                          position
   */
  template<class T, class JTypename_t, class JComparator_t>
  inline JVector3D getPosition(T __begin,
			       T __end,
			       const JPredicate<JTypename_t, JComparator_t>& predicate,
			       const JVector3D& position)
  {
    try {
      return getPosition(__begin, __end, predicate);
    }
    catch(const std::exception&) {
      return position;
    }
  }


  /**
   * Get UNIX time of given DAQ object.
   *
   * \param  chronometer              chronometer
   * \return                          UNIX time [s]
   */
  inline double getUNIXTime(const KM3NETDAQ::JDAQChronometer& chronometer)
  {
    return chronometer.getTimesliceStart().getTimeNanoSecond() * 1.0e-9;
  }
}

#endif