/**
 * @file NoveltyDetectorCodebookLevel.h
 * @brief Compute novelty of images based on relations between extracted features and current codebook
 * @author Alexander Freytag
 * @date 02-05-2013 (dd-mm-yyyy)
*/
#ifndef _INCLUDENOVELTYDETECTIONCODEBOOKLEVEL
#define _INCLUDENOVELTYDETECTIONCODEBOOKLEVEL

#include "NoveltyDetector.h"

//core
#include <core/vector/Distance.h>
#include <core/vector/VVector.h>

// vislearning
#include <vislearning/cbaselib/MultiDataset.h>
// 
#include <vislearning/features/localfeatures/GenericLocalFeatureSelection.h>
// 
#include <vislearning/math/cluster/ClusterAlgorithm.h>




namespace OBJREC
{

  /**
   * @class NoveltyDetectorCodebookLevel
   * @brief Compute novelty of images based on relations between extracted features and current codebook
   * @author Alexander Freytag
   * @date 02-05-2013 (dd-mm-yyyy)
  */  
  
  class NoveltyDetectorCodebookLevel : public NoveltyDetector
  {

    protected:
      
      /************************
       * 
       *   protected variables
       * 
       **************************/       
             
      NICE::VectorDistance<double> * distFunction;

      LocalFeatureRepresentation * featureExtractor;
      
      //! The currently known "cluster" centers, which are used for BoW histogram computation  (i.e., the codebook)
      NICE::VVector * prototypes;   
      
      //! was an initial codebook already computed?
      bool b_loadInitialCodebook;
      //!shall the initially computed codebook be stored somewhere?
      bool  b_saveInitialCodebook; 
      //! where should an initial codebook be located, i.e., read from and written to?
      std::string cacheInitialCodebook;  
      
      //! did we compute a codebook on our own or do we use simply a pointer to an external codebook?
      bool externalCodebook;
                       
      
      /************************
       * 
       *   protected methods
       * 
       **************************/
            
      void setFeatureExtractor( const bool & _setForTraining = false);
      
      void extractFeaturesFromTrainingImages(  const OBJREC::MultiDataset *_md,  NICE::VVector & examplesTraining  ); 
      
      virtual bool loadInitialCodebook ( );
      virtual bool writeInitialCodebook ( );      


    public:

      /** constructor
        * @param _conf needs a configfile
        * @param _md and a MultiDataset (contains images and other things)
        * @param _section section information for parsing config files
        */
      NoveltyDetectorCodebookLevel ( const NICE::Config *_conf, const OBJREC::MultiDataset *_md , const std::string & _section = "noveltyDetector");

      /** simple destructor */
      virtual ~NoveltyDetectorCodebookLevel();
      
      /** 
       * @brief  Evaluate whether or not the image of the specified filename is novel with respect to the current known examples or not
       * @author Alexander Freytag
       * @date 02-05-2013 (dd-mm-yyyy)
       * @param _filename of the new image 
       * @return bool (true: class/content/... of image is novel, false: class/content/... of image is known)
       * @note This function has to be overloaded by all subclasses!          
      */
      virtual bool evaluateNoveltyOfImage ( const std::string & _filename ) = 0;
      
      /** 
       * @brief  Evaluate whether or not the image of the specified filename is novel with respect to the current known examples or not
       * @author Alexander Freytag
       * @date 02-05-2013 (dd-mm-yyyy)
       * @param _noveltyImage contains min distances of features to the current codebook
       * @return bool (true: class/content/... of image is novel, false: class/content/... of image is known)
      */      
      virtual bool evaluateNoveltyOfImage ( const NICE::FloatImage & _noveltyImage ) = 0;
      
      /** 
       * @brief  Hand over a previously computed codebook
       * @author Alexander Freytag
       * @date 02-05-2013 (dd-mm-yyyy)
       * @param _prototypes pointer to a codebook
       * @note we check whether we just use the pointer to the external codebook, or alternatively copy it and have it as internal codebook available lateron
      */            
      virtual void setCodebook( NICE::VVector * _prototypes);
            

  };


} // namespace

#endif