#ifndef __JAANET__JEVTWEIGHT__
#define __JAANET__JEVTWEIGHT__

#include "km3net-dataformat/definitions/weightlist.hh"

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

#include "JLang/JClonable.hh"

#include "JAAnet/JEvtWeightInterface.hh"


/**
 * \author mdejong, bjjung
 */

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

namespace JAANET {

  using JLANG::JClonable;

  
  /**
   * Abstract base class for event weighing.
   */
  struct JEvtWeight :
    public JEvtWeightInterface,
    public JClonable<JEvtWeight>
  {
    /**
     * Default constructor.
     */
    JEvtWeight() : normalisation(1.0)
    {}


    /**
     * Virtual destructor.
     */
    virtual ~JEvtWeight()
    {}

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

    /**
     * Get event-weight normalisation.
     * Note: the return-value should be *multiplied* in order to normalise the event-weight
     *
     * \param  evt               event
     * \return                   event-weight normalisation
     */
    virtual double getNormalisation(const Evt& evt) const
    {
      return (evt.w.size() > WEIGHTLIST_NORMALISATION &&
	      evt.w[WEIGHTLIST_NORMALISATION] > 0.0 ?
	      evt.w[WEIGHTLIST_NORMALISATION] : normalisation);
    }


    /**
     * 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) override
    {
      this->normalisation = normalisation;
    }
    

  protected:

    double normalisation; //!< Event-weight normalisation
  };
}

#endif