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#ifndef PhysicsTools_MVAComputer_MVAModuleHelper_h
#define PhysicsTools_MVAComputer_MVAModuleHelper_h
// -*- C++ -*-
//
// Package:     MVAComputer
// Class  :     MVAModuleHelper
//

//
// Author:      Christophe Saout <christophe.saout@cern.ch>
// Created:     Sat Apr 24 15:18 CEST 2007
// $Id: MVAModuleHelper.h,v 1.3 2011/04/20 07:07:37 kukartse Exp $
//

#include <functional>
#include <algorithm>
#include <numeric>
#include <cstring>
#include <string>
#include <vector>
#include <cmath>

#include <boost/bind.hpp>

#include "FWCore/Framework/interface/EventSetup.h"

#include "PhysicsTools/MVAComputer/interface/AtomicId.h"
#include "PhysicsTools/MVAComputer/interface/Calibration.h"
#include "PhysicsTools/MVAComputer/interface/MVAComputerCache.h"
#include "CondFormats/PhysicsToolsObjects/interface/MVAComputer.h"

namespace PhysicsTools {

template<typename Object>
struct MVAModuleHelperDefaultFiller {
        MVAModuleHelperDefaultFiller(const PhysicsTools::AtomicId &name) {}

        double operator()(const Object &object,
                          const PhysicsTools::AtomicId &name)
        { return object.compute(name); }
};

template<class Record, typename Object,
         class Filler = MVAModuleHelperDefaultFiller<Object> >
class MVAModuleHelper {
    public:
        MVAModuleHelper(const std::string &label) : label(label) {}
        MVAModuleHelper(const MVAModuleHelper &orig) : label(orig.label) {}
        ~MVAModuleHelper() {}

        void setEventSetup(const edm::EventSetup &setup);
        void setEventSetup(const edm::EventSetup &setup, const char *esLabel);

        double operator()(const Object &object) const;

        void train(const Object &object, bool target, double weight = 1.0) const;

    private:
        void init(const PhysicsTools::Calibration::MVAComputerContainer *container);

        const std::string               label;
        PhysicsTools::MVAComputerCache  cache;

        class Value {
            public:
                Value(const std::string &name) :
                        name(name), filler(name) {}
                Value(const std::string &name, double value) :
                        name(name), filler(name), value(value) {}

                inline bool update(const Object &object) const
                {
                        value = filler(object, name);
                        return !std::isfinite(value);
                }

                PhysicsTools::AtomicId getName() const { return name; }
                double getValue() const { return value; }

            private:
                PhysicsTools::AtomicId          name;
                Filler                          filler;

                mutable double                  value;
        };

        std::vector<Value>                      values;
};

template<class Record, typename Object, class Filler>
void MVAModuleHelper<Record, Object, Filler>::setEventSetup(
                                                const edm::EventSetup &setup)
{
        edm::ESHandle<PhysicsTools::Calibration::MVAComputerContainer> handle;
        setup.get<Record>().get(handle);
        const PhysicsTools::Calibration::MVAComputerContainer *container = handle.product();
        if (cache.update(container, label.c_str()) && cache)
                init(container);
}

template<class Record, typename Object, class Filler>
void MVAModuleHelper<Record, Object, Filler>::setEventSetup(
                        const edm::EventSetup &setup, const char *esLabel)
{
        edm::ESHandle<PhysicsTools::Calibration::MVAComputerContainer> handle;
        setup.get<Record>().get(esLabel, handle);
        const PhysicsTools::Calibration::MVAComputerContainer *container = handle.product();
        if (cache.update(container, label.c_str()) && cache)
                init(container);
}

template<class Record, typename Object, class Filler>
void MVAModuleHelper<Record, Object, Filler>::init(
        const PhysicsTools::Calibration::MVAComputerContainer *container)
{
        const std::vector<PhysicsTools::Calibration::Variable> &vars =
                                        container->find(label).inputSet;
        values.clear();
        for(std::vector<PhysicsTools::Calibration::Variable>::const_iterator
                        iter = vars.begin(); iter != vars.end(); ++iter)
                if (std::strncmp(iter->name.c_str(), "__", 2) != 0)
                        values.push_back(Value(iter->name));
}

template<class Record, typename Object, class Filler>
double MVAModuleHelper<Record, Object, Filler>::operator()(
                                                const Object &object) const
{
        std::for_each(values.begin(), values.end(),
                      boost::bind(&Value::update, _1, object));
        return cache->eval(values);
}

template<class Record, typename Object, class Filler>
void MVAModuleHelper<Record, Object, Filler>::train(
                const Object &object, bool target, double weight) const
{
        static const PhysicsTools::AtomicId kTargetId("__TARGET__");
        static const PhysicsTools::AtomicId kWeightId("__WEIGHT__");

        if (!cache)
                return;

        using boost::bind;
        if (std::accumulate(values.begin(), values.end(), 0,
                            bind(std::plus<int>(), _1,
                                 bind(&Value::update, _2, object))))
                return;

        PhysicsTools::Variable::ValueList list;
        list.add(kTargetId, target);
        list.add(kWeightId, weight);
        for(typename std::vector<Value>::const_iterator iter = values.begin();
            iter != values.end(); ++iter)
                list.add(iter->getName(), iter->getValue());

        cache->eval(list);
}

} // namespace PhysicsTools

#endif // PhysicsTools_MVAComputer_MVAModuleHelper_h