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// -*- C++ -*-
//
// Package:    FFTJetProducers
// Class:      FFTJetProducer
// 
//
// Original Author:  Igor Volobouev
//         Created:  Sun Jun 20 14:32:36 CDT 2010
// $Id: FFTJetProducer.h,v 1.2 2010/12/07 00:19:43 igv Exp $
//
//

#ifndef RecoJets_FFTJetProducers_FFTJetProducer_h
#define RecoJets_FFTJetProducers_FFTJetProducer_h

#include <memory>

// FFTJet headers
#include "fftjet/AbsRecombinationAlg.hh"
#include "fftjet/AbsVectorRecombinationAlg.hh"
#include "fftjet/SparseClusteringTree.hh"

// framework include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"

#include "DataFormats/Candidate/interface/CandidateFwd.h"

// local FFTJet-related definitions
#include "RecoJets/FFTJetAlgorithms/interface/fftjetTypedefs.h"
#include "RecoJets/FFTJetProducers/interface/FFTJetInterface.h"

namespace fftjetcms {
    class DiscretizedEnergyFlow;
}

//
// class declaration
//
class FFTJetProducer : public edm::EDProducer, 
                       public fftjetcms::FFTJetInterface
{
public:
    typedef fftjet::RecombinedJet<fftjetcms::VectorLike> RecoFFTJet;
    typedef fftjet::SparseClusteringTree<fftjet::Peak,long> SparseTree;

    enum Resolution
    {
        FIXED = 0,
        MAXIMALLY_STABLE,
        GLOBALLY_ADAPTIVE,
        LOCALLY_ADAPTIVE
    };

    explicit FFTJetProducer(const edm::ParameterSet&);
    virtual ~FFTJetProducer();

    // Parser for the resolution enum
    static Resolution parse_resolution(const std::string& name);

protected:
    // Functions which should be overriden from the base
    virtual void beginJob();
    virtual void produce(edm::Event&, const edm::EventSetup&);
    virtual void endJob();

    // The following functions can be overriden by derived classes 
    // in order to adjust jet reconstruction algorithm behavior.

    // Override the following method in order to implement
    // your own precluster selection strategy
    virtual void selectPreclusters(
        const SparseTree& tree,
        const fftjet::Functor1<bool,fftjet::Peak>& peakSelector,
        std::vector<fftjet::Peak>* preclusters);

    // Override the following method (which by default does not do
    // anything) in order to implement your own process-dependent
    // assignment of membership functions to preclusters. This method
    // will be called once per event, just before the main algorithm.
    virtual void assignMembershipFunctions(
        std::vector<fftjet::Peak>* preclusters);

    // Parser for the peak selector
    virtual std::auto_ptr<fftjet::Functor1<bool,fftjet::Peak> >
    parse_peakSelector(const edm::ParameterSet&);

    // Parser for the default jet membership function
    virtual std::auto_ptr<fftjet::ScaleSpaceKernel>
    parse_jetMembershipFunction(const edm::ParameterSet&);

    // Parser for the background membership function
    virtual std::auto_ptr<fftjetcms::AbsBgFunctor>
    parse_bgMembershipFunction(const edm::ParameterSet&);

    // Calculator for the recombination scale
    virtual std::auto_ptr<fftjet::Functor1<double,fftjet::Peak> >
    parse_recoScaleCalcPeak(const edm::ParameterSet&);

    // Calculator for the recombination scale ratio
    virtual std::auto_ptr<fftjet::Functor1<double,fftjet::Peak> >
    parse_recoScaleRatioCalcPeak(const edm::ParameterSet&);

    // Calculator for the membership function factor
    virtual std::auto_ptr<fftjet::Functor1<double,fftjet::Peak> >
    parse_memberFactorCalcPeak(const edm::ParameterSet&);

    // Similar calculators for the iterative algorithm
    virtual std::auto_ptr<fftjet::Functor1<double,RecoFFTJet> >
    parse_recoScaleCalcJet(const edm::ParameterSet&);

    virtual std::auto_ptr<fftjet::Functor1<double,RecoFFTJet> >
    parse_recoScaleRatioCalcJet(const edm::ParameterSet&);

    virtual std::auto_ptr<fftjet::Functor1<double,RecoFFTJet> >
    parse_memberFactorCalcJet(const edm::ParameterSet&);

    // Calculator of the distance between jets which is used to make
    // the decision about convergence of the iterative algorithm
    virtual std::auto_ptr<fftjet::Functor2<double,RecoFFTJet,RecoFFTJet> >
    parse_jetDistanceCalc(const edm::ParameterSet&);

    // The following function performs most of the precluster selection
    // work in this module. You might want to reuse it if only a slight
    // modification of the "selectPreclusters" method is desired.
    void selectTreeNodes(const SparseTree& tree,
                         const fftjet::Functor1<bool,fftjet::Peak>& peakSelect,
                         std::vector<SparseTree::NodeId>* nodes);
private:
    typedef fftjet::AbsVectorRecombinationAlg<
        fftjetcms::VectorLike,fftjetcms::BgData> RecoAlg;
    typedef fftjet::AbsRecombinationAlg<
        fftjetcms::Real,fftjetcms::VectorLike,fftjetcms::BgData> GridAlg;

    // Explicitly disable other ways to construct this object
    FFTJetProducer();
    FFTJetProducer(const FFTJetProducer&);
    FFTJetProducer& operator=(const FFTJetProducer&);

    // Useful local utilities
    template<class Real>
    void loadSparseTreeData(const edm::Event&);

    // The following methods do most of the work
    void buildGridAlg();
    void prepareRecombinationScales();
    void loadEnergyFlow(const edm::Event& iEvent);
    bool checkConvergence(const std::vector<RecoFFTJet>& previousIterResult,
                          std::vector<RecoFFTJet>& thisIterResult);
    void determineGriddedConstituents();
    void determineVectorConstituents();
    void saveResults(edm::Event& iEvent, const edm::EventSetup&);

    template <typename Jet>
    void writeJets(edm::Event& iEvent, const edm::EventSetup&);

    template <typename Jet>
    void makeProduces(const std::string& alias, const std::string& tag);

    // The following function returns the number of iterations
    // performed. If this number equals to or less than "maxIterations"
    // then the iterations have converged. If the number larger than
    // "maxIterations" then the iterations failed to converge (note,
    // however, that only "maxIterations" iterations would still be
    // performed).
    unsigned iterateJetReconstruction();

    //
    // ----------member data ---------------------------
    //

    // Local copy of the module configuration 
    const edm::ParameterSet myConfiguration;

    // Label for the tree produced by FFTJetPatRecoProducer
    const edm::InputTag treeLabel;

    // Are we going to use energy flow discretization grid as input
    // to jet reconstruction?
    const bool useGriddedAlgorithm;

    // Are we going to rebuild the energy flow discretization grid
    // or to reuse the grid made by FFTJetPatRecoProducer?
    const bool reuseExistingGrid;

    // Are we iterating?
    const unsigned maxIterations;

    // Parameters which affect iteration convergence
    const unsigned nJetsRequiredToConverge;
    const double convergenceDistance;

    // Are we building assignments of collection members to jets?
    const bool assignConstituents;

    // Are we resumming the constituents to determine jet 4-vectors?
    // This might make sense if FFTJet is used in the crisp, gridded
    // mode to determine jet areas, and vector recombination is desired.
    const bool resumConstituents;

    // Scale for the peak selection (if the scale is fixed)
    const double fixedScale;

    // Minimum and maximum scale for searching stable configurations
    const double minStableScale;
    const double maxStableScale;

    // Stability "alpha"
    const double stabilityAlpha;

    // Not sure at this point how to treat noise... For now, this is
    // just a single configurable number...
    const double noiseLevel;

    // Number of clusters requested (if the scale is adaptive)
    const unsigned nClustersRequested;

    // Maximum eta for the grid-based algorithm
    const double gridScanMaxEta;

    // Parameters related to the recombination algorithm
    const std::string recombinationAlgorithm;
    const bool isCrisp;
    const double unlikelyBgWeight;
    const double recombinationDataCutoff;

    // Resolution. The corresponding parameter value
    // should be one of "fixed", "maximallyStable",
    // "globallyAdaptive", or "locallyAdaptive".
    Resolution resolution;

    // Scales used
    std::auto_ptr<std::vector<double> > iniScales;

    // The sparse clustering tree
    SparseTree sparseTree;

    // Peak selector for the peaks already in the tree
    std::auto_ptr<fftjet::Functor1<bool,fftjet::Peak> > peakSelector;

    // Recombination algorithms and related quantities
    std::auto_ptr<RecoAlg> recoAlg;
    std::auto_ptr<GridAlg> gridAlg;
    std::auto_ptr<fftjet::ScaleSpaceKernel> jetMembershipFunction;
    std::auto_ptr<fftjetcms::AbsBgFunctor> bgMembershipFunction;

    // Calculator for the recombination scale
    std::auto_ptr<fftjet::Functor1<double,fftjet::Peak> > recoScaleCalcPeak;

    // Calculator for the recombination scale ratio
    std::auto_ptr<fftjet::Functor1<double,fftjet::Peak> >
    recoScaleRatioCalcPeak;

    // Calculator for the membership function factor
    std::auto_ptr<fftjet::Functor1<double,fftjet::Peak> > memberFactorCalcPeak;

    // Similar calculators for the iterative algorithm
    std::auto_ptr<fftjet::Functor1<double,RecoFFTJet> > recoScaleCalcJet;
    std::auto_ptr<fftjet::Functor1<double,RecoFFTJet> > recoScaleRatioCalcJet;
    std::auto_ptr<fftjet::Functor1<double,RecoFFTJet> > memberFactorCalcJet;

    // Calculator for the jet distance used to estimate convergence
    // of the iterative algorithm
    std::auto_ptr<fftjet::Functor2<double,RecoFFTJet,RecoFFTJet> >
    jetDistanceCalc;

    // Vector of selected tree nodes
    std::vector<SparseTree::NodeId> nodes;

    // Vector of selected preclusters
    std::vector<fftjet::Peak> preclusters;

    // Vector of reconstructed jets (we will refill it in every event)
    std::vector<RecoFFTJet> recoJets;

    // Cluster occupancy calculated as a function of level number
    std::vector<unsigned> occupancy;

    // The thresholds obtained by the LOCALLY_ADAPTIVE method
    std::vector<double> thresholds;

    // Minimum, maximum and used level calculated by some algorithms
    unsigned minLevel, maxLevel, usedLevel;

    // Unclustered/unused energy produced during recombination
    fftjetcms::VectorLike unclustered;
    double unused;

    // Quantities defined below are used in the iterative mode only
    std::vector<fftjet::Peak> iterPreclusters;
    std::vector<RecoFFTJet> iterJets;
    unsigned iterationsPerformed;

    // Vectors of constituents
    std::vector<std::vector<reco::CandidatePtr> > constituents;
};

#endif // RecoJets_FFTJetProducers_FFTJetProducer_h