#ifndef _RandomViewCellsHandler_H__
#define _RandomViewCellsHandler_H__

#include "Containers.h"
#include "SimpleRay.h"


namespace GtpVisibilityPreprocessor {

class ViewCell;
class ViewCellsManager;

typedef pair<ViewCell *, SimpleRayContainer> ViewCellPoints;
typedef vector<ViewCellPoints *> ViewCellPointsList;


/** This class functions define a system to generate, export and import a list
	of random view cells and valid view points.
*/

class RandomViewCellsHandler
{
	//friend class ViewCellsManager;

public:

	RandomViewCellsHandler(ViewCellsManager *vcManager);
	~RandomViewCellsHandler();

	/** Exports list of random view cells.
	*/
	bool ExportRandomViewCells(const string &filename);
	/** Returns the stored list of view cells and view points.
	*/
	ViewCellPointsList *GetViewCellPointsList();
	/** Load list of view cells using the current list of view points.
	*/
	bool ImportViewCellsList(const string &filename);


protected:

	bool GenerateRandomViewCells(ViewCellContainer &viewCells, 
								 const int numViewCells);

	bool GenerateRandomViewCells(ViewCellPointsList &viewCells,
								 const int nViewCells,
								 const int nViewPoints);


	/** Generates a list of random view points in a view cells.
		@param viewCell the view cells
		@param numViewPoints the number of view points
		@param viewPoints returns view points in this container.
	*/
	bool GenerateViewPoints(ViewCell *viewCell, 
							const int numViewPoints,
							SimpleRayContainer &viewPoints);

	/** Load list of view cells and view points.
	*/
	bool ImportViewCellsList(const string &filename, 
							 vector<ViewCellPoints *> &viewCells);

	/** Exports list of random view cells and valid view points.
	*/
	bool ExportRandomViewCells(const string &filename,
							   const vector<ViewCellPoints *> &viewCells);

	/** Generates a new valid random view point.
	*/
	bool GenerateViewPoint(ViewCell *viewCell, SimpleRay &ray);

	/** Returns true if this view cell is in valid view space.
	*/
	bool IsValidViewSpace(ViewCell *vc);

	
protected:

	ViewCellsManager *mViewCellsManager;

	ViewCellPointsList mViewCellPointsList;
};

}


#endif