#ifndef __JAANET__JEVTWEIGHTINTERFACE__
#define __JAANET__JEVTWEIGHTINTERFACE__

#include "km3net-dataformat/offline/Head.hh"
#include "km3net-dataformat/offline/Evt.hh"

#include "JAAnet/JHead.hh"


/**
 * \author mdejong
 */

namespace JAANET {}
namespace JPP { using namespace JAANET; }

namespace JAANET {

  /**
   * Low-level interface for event weighing.
   */
  struct JEvtWeightInterface
  {
    /**
     * Get name.
     *
     * \return                   name
     */
    virtual const char* const getName() const = 0;


    /**
     * Configuration.
     *
     * \param  header            header
     */
    virtual void configure(const JHead& header) = 0;


    /**
     * Check whether header is consistent with this event weighter.
     *
     * \param  header            header
     * \return                   true if consistent; else false
     */
    virtual bool check(const JHead& header) const = 0;

    
    /**
     * Get weight of given event.
     *
     * \param  evt               event
     * \return                   weight        [Hz]
     */
    virtual double getWeight(const Evt& evt) const = 0;


    /**
     * Get event-weight normalisation factor.
     * Note: the return-value should be *multiplied* in order to normalise the event-weight
     *
     * \return                   event-weight normalisation factor.
     */
    virtual double getNormalisation() const = 0;


    /**
     * Set event-weight normalisation factor.
     * Note: the set-value should be *multiplied* in order to normalise the event-weight
     *
     * \param  normalisation     event-weight normalisation factor.
     */
    virtual void setNormalisation(const double normalisation) = 0;
  };
}

#endif