/** 
* @file GenericLocalFeatureSelection.h
* @brief This class provides a generic chooser function for different descriptors, which are derived from LocalFeatureRepresentation.
* @date 26.10.2011
*/

#ifndef _NICE_OBJREC_LF_SELECTION_INCLUDE
#define _NICE_OBJREC_LF_SELECTION_INCLUDE

#include "vislearning/features/localfeatures/LocalFeatureRepresentation.h"
#include "vislearning/features/localfeatures/LFMikolajczyk.h"
#include "vislearning/features/localfeatures/LFPatches.h"
#include "vislearning/features/localfeatures/LFGenericLocal.h"
#include "vislearning/features/localfeatures/LFSiftPP.h"
// #include "vislearning/features/localfeatures/LFSegmentation.h" //located in objrec, please move this to ensure its functionality
#include "vislearning/features/localfeatures/LFWriteCache.h"
#include "vislearning/features/localfeatures/LFReadCache.h"
// #include "vislearning/features/localfeatures/LFSegContour.h" //located in objrec, please move this to ensure its functionality
#include "vislearning/features/localfeatures/LFColorSande.h"
#include "vislearning/features/localfeatures/LFonHSG.h"

/** NOTE: This class only returns Descriptors, which NOT need any given positions. All Descriptors calculate there own positions, on DIFFERENT ways. **/


namespace OBJREC {

class GenericLFSelection
{
    public:

      /** LocalFeature Selector
       * @brief This methode switches between the different LocalFeature-Types. One has to set the "localfeature_type" on a valid value and the methode returns a LocalFeatureRepresentation derived Object.
       * @param[in] Config* - A pointer to the given configfile, which must contain "section" - "localfeature_type"
       * @param[in] string  - This string defines the value for "section" in the configfile.
       * @return LocalFeatureRepresentation* - The LocalFeatureRepresentation which contains the selected LocalFeature-Type.
       */
      static
      LocalFeatureRepresentation *selectLocalFeatureRep ( const NICE::Config *conf, std::string section = "features" )
      {
	  // return Value
	  LocalFeatureRepresentation *lfrep = NULL;
	
	  // string which defines the localfeature_type (for Ex. Sande, ...)
	  std::string localfeature_type = conf->gS(section, "localfeature_type", "");
	
	  if ( localfeature_type == "mikolajczyk" )
	  {
	    lfrep = new LFMikolajczyk ( conf );
	  }
	  else if ( localfeature_type == "color" )
	  {
	    lfrep = new LFColorSande ( conf );
	  }
	  else if ( ( localfeature_type == "sift" ) || ( localfeature_type == "siftpp" ) ) 
	  {
            lfrep = new LFSiftPP ( conf );
	  }
	  else if ( ( localfeature_type == "generic_local" ) || ( localfeature_type == "generic" ) )
	  {
            int numFeatures = conf->gI(section, "localfeature_count");
	    lfrep = new LFGenericLocal ( conf, numFeatures );
	  }
	  else if ( ( localfeature_type == "grey" ) || ( localfeature_type == "patches" ) )
	  {
	    int numFeatures = conf->gI(section, "localfeature_count");
	    lfrep = new LFPatches ( conf, numFeatures );
	  } 
	  else if( ( localfeature_type == "onHSG" ) )
	  {
	    lfrep = new LFonHSG( conf);
	  }
	  else 
	  {
		  lfrep = NULL;
	  }

	  if ( conf->gB(section, "localfeature_cache_read", false) )
	  {
		  int numFeatures = conf->gI(section, "localfeature_count", -1);
		  LocalFeatureRepresentation *lfrep_read = new LFReadCache ( conf, lfrep, numFeatures );
		  lfrep = lfrep_read;
	  }

	  // no correct localfeature_type was given
	  if ( lfrep == NULL )
		  fthrow(NICE::Exception, "Local feature type not found: " << localfeature_type );

	  if ( conf->gB(section, "localfeature_cache_save", false) )
	  {
		  LocalFeatureRepresentation *lfrep_save = new LFWriteCache ( conf, lfrep );
		  lfrep = lfrep_save;
	  }
		  
	  return lfrep;
      }
};

}

#endif