#ifndef __JAANET__JWEIGHTMUPAGE__
#define __JAANET__JWEIGHTMUPAGE__

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

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

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

#include "JAAnet/JHead.hh"
#include "JAAnet/JHeadToolkit.hh"
#include "JAAnet/JEvtWeight.hh"
#include "JAAnet/JEvtWeightFactor.hh"
#include "JAAnet/JEvtWeightFactorHelper.hh"

/**
 * \author mdejong
 */

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

namespace JAANET {

  using JLANG::JClonable;
  
  
  /**
   * Implementation of event weighing for MUPAGE data.
   */
  struct JEvtWeightMupage final :
    public JEvtWeightFactorHelper,
    public JClonable<JEvtWeight, JEvtWeightMupage>
  {
    /**
     * Default Constructor.
     */
    JEvtWeightMupage() :
      JEvtWeightFactorHelper()
    {}

    
    /**
     * Constructor.
     *
     * \param  header            header
     */
    JEvtWeightMupage(const JHead& header) :
      JEvtWeightFactorHelper()
    {
      configure(header);
    } 

    
    /**
     * Constructor.
     *
     * \param  header            header
     * \param  factor            factor
     */
    JEvtWeightMupage(const JHead&            header,
		     const JEvtWeightFactor& factor)
    {
      configure(header);
      JEvtWeightFactorHelper::configure(factor);
    } 


    /**
     * Get name.
     *
     * \return                   name
     */
    const char* const getName() const override final
    {
      return "MUPAGE";
    }

    
    /**
     * Configuration.
     *
     * \param  header            header
     */
    void configure(const JHead& header) override final
    {
      using namespace JPP;
      
      if (check(header)) {

	const double dt = ( header.time_interval.t2 - header.time_interval.t1 > 0.0 ?
			    header.time_interval.t2 - header.time_interval.t1       :
			    (header.livetime.numberOfSeconds > 0.0 ?
			     header.livetime.numberOfSeconds : 1.0) );
	
	setNormalisation(1.0 / dt);

      } else {
	
	THROW(JValueOutOfRange, "JEvtWeightMupage::configure(): Provided header is inconsistent with MUPAGE.");
      }
    }

    
    /**
     * Check whether header is consistent with this event weighter.
     *
     * \param  header            header
     * \return                   true if consistent; else false
     */
    bool check(const JHead& header) const override final
    {
      return is_mupage(header);
    }
    
    
    /**
     * Get rate of given event.
     *
     * \param  evt               event
     * \return                   weight [1/s]
     */
    double getWeight(const Evt& evt) const override final
    {
      if (static_cast<const JEvtWeightFactorHelper&>(*this)) {
	
	return getFactor(evt) * getNormalisation(evt);
	
      } else if (evt.w.size() > WEIGHTLIST_RESCALED_EVENT_RATE) {

	return evt.w[WEIGHTLIST_RESCALED_EVENT_RATE];
	
      } else {
	
	return getNormalisation(evt);
      }
    }
  };
}

#endif