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#ifndef PhysicsTools_MVATrainer_MVATrainer_h
#define PhysicsTools_MVATrainer_MVATrainer_h

#include <memory>
#include <string>
#include <map>

#include <xercesc/dom/DOM.hpp>

#include "FWCore/Utilities/interface/Exception.h"

#include "PhysicsTools/MVAComputer/interface/AtomicId.h"
#include "PhysicsTools/MVAComputer/interface/Calibration.h"
#include "PhysicsTools/MVAComputer/interface/Variable.h"
#include "PhysicsTools/MVAComputer/interface/MVAComputer.h"

#include "PhysicsTools/MVATrainer/interface/XMLDocument.h"
#include "PhysicsTools/MVATrainer/interface/SourceVariable.h"
#include "PhysicsTools/MVATrainer/interface/SourceVariableSet.h"
#include "PhysicsTools/MVATrainer/interface/TrainerMonitoring.h"

namespace PhysicsTools {

class Source;
class TrainProcessor;

class MVATrainer {
    public:
        MVATrainer(const std::string &fileName, bool useXSLT = false,
                   const char *styleSheet = 0);
        ~MVATrainer();

        inline void setAutoSave(bool autoSave) { doAutoSave = autoSave; }
        inline void setCleanup(bool cleanup) { doCleanup = cleanup; }
        inline void setMonitoring(bool monitoring) { doMonitoring = monitoring; }
        inline void setRandomSeed(UInt_t seed) { randomSeed = seed; }
        inline void setCrossValidation(double split) { crossValidation = split; }

        void loadState();
        void saveState();

        Calibration::MVAComputer *getTrainCalibration() const;
        void doneTraining(Calibration::MVAComputer *trainCalibration) const;

        Calibration::MVAComputer *getCalibration() const;

        // used by TrainProcessors

        std::string trainFileName(const TrainProcessor *proc,
                                  const std::string &ext,
                                  const std::string &arg = "") const;

        inline const std::string &getName() const { return name; }

        TrainerMonitoring::Module *bookMonitor(const std::string &name);

        // constants

        static const AtomicId kTargetId;
        static const AtomicId kWeightId;

    private:
        SourceVariable *getVariable(AtomicId source, AtomicId name) const;

        SourceVariable *createVariable(Source *source, AtomicId name,
                                       Variable::Flags flags);

        struct CalibratedProcessor {
                CalibratedProcessor(TrainProcessor *processor,
                                    Calibration::VarProcessor *calib) :
                        processor(processor), calib(calib) {}

                TrainProcessor                  *processor;
                Calibration::VarProcessor       *calib;
        };

        void fillInputVars(SourceVariableSet &vars,
                           XERCES_CPP_NAMESPACE_QUALIFIER DOMElement *xml);

        void fillOutputVars(SourceVariableSet &vars, Source *source,
                            XERCES_CPP_NAMESPACE_QUALIFIER DOMElement *xml);

        void makeProcessor(XERCES_CPP_NAMESPACE_QUALIFIER DOMElement *elem,
                           AtomicId id, const char *name);

        void connectProcessors(Calibration::MVAComputer *calib,
                               const std::vector<CalibratedProcessor> &procs,
                               bool withTarget) const;

        Calibration::MVAComputer *
        makeTrainCalibration(const AtomicId *compute,
                             const AtomicId *train) const;

        void
        findUntrainedComputers(std::vector<AtomicId> &compute,
                               std::vector<AtomicId> &train) const;

        std::vector<AtomicId> findFinalProcessors() const;

        std::map<AtomicId, Source*>             sources;
        std::vector<SourceVariable*>            variables;
        std::vector<AtomicId>                   processors;
        Source                                  *input;
        TrainProcessor                          *output;

        std::auto_ptr<TrainerMonitoring>        monitoring;
        std::auto_ptr<XMLDocument>              xml;
        std::string                             trainFileMask;
        std::string                             name;
        bool                                    doAutoSave;
        bool                                    doCleanup;
        bool                                    doMonitoring;

        UInt_t                                  randomSeed;
        double                                  crossValidation;
};

} // namespace PhysicsTools

#endif // PhysicsTools_MVATrainer_MVATrainer_h