#ifndef __GA_SELECTION_H__
#define __GA_SELECTION_H__

#include "..\CallConvention.h"
#include "..\Common\GaParameters.h"
#include "..\Common\GaOperation.h"
#include "..\Common\GaCatalogue.h"
#include "..\Chromosome\GaChromosome.h"

using namespace Common;
using namespace Chromosome;
using namespace Population; 

namespace Population
{

	class GaPopulation;
	class GaSortedGroup;

	// Base class of all parameters for selection operations.
	class GaSelectionParams : public GaParameters
	{

	protected:

		// Number of chromosomes to select from population
		int _selectionSize;

	public:

		// Initialization of the parameters
		DLL_EXPORT
		GaSelectionParams(int selectionSize);

		// Initialization of the parameters with default values
		DLL_EXPORT
		GaSelectionParams();

		// Virtual copy constructor
		DLL_EXPORT
		virtual GaParameters* GACALL Clone() const;

		// Returns number of chromosomes to select from population
		DLL_EXPORT
		int GACALL GetSelectionSize() const;

		// Sets number of chromosomes to select from population
		DLL_EXPORT
		void GACALL SetSelectionSize(int size);

	};// END CLASS DEFINITION GaSelectionParams

	// Base class of all results for selection operations.
	class GaSelectionResultSet
	{

	protected:

		// Group of selected chromosomes
		GaSortedGroup* _selectedGroup;

	public:

		// Initialization
		DLL_EXPORT
		GaSelectionResultSet(int selectionSize,
					 const GaPopulation* population);

		// Releases aquired resources
		DLL_EXPORT
		virtual ~GaSelectionResultSet();

		// Returns group of selected chromosomes
		DLL_EXPORT
		GaSortedGroup& GACALL SelectedGroup() const;

		// Returns pointer to chromosome at given position in selection group.
		DLL_EXPORT
		GaChromosomePtr GACALL GetAt(int pos) const;

		// Returns pointer to chromosome at given position in selection group.
		DLL_EXPORT
		GaChromosomePtr GACALL operator [](int pos) const;

	};// END CLASS DEFINITION GaSelectionResultSet

	// Interface for selection operations.
	class GaSelectionOperation : public GaOperation
	{

	public:

		// Selects chromosomes from the given population based on passed parameters
		virtual void GACALL operator ()(const GaPopulation& population,
						   const GaSelectionParams& parameters,
						   GaSelectionResultSet* result) const=0;

		// Allocate memory and make apropriate result set for the selection operation.
		// Caller is responsible for allocated memory.
		DLL_EXPORT
		virtual GaSelectionResultSet* GACALL MakeResultSet(GaPopulation* population,
			const GaSelectionParams& parameters) const;

	};// END CLASS DEFINITION GaSelectionOperation

	// Selection operation and its parameters
	typedef GaOperationParametersPair<GaSelectionOperation, GaSelectionParams> GaSelectionPair;

	// Catalogue of selection operations
	typedef GaCatalogue<GaSelectionOperation> GaSelectionCatalogue;

} // Population

#endif // __GA_SELECTION_H__