#ifndef _VssPreprocessor_H__
#define _VssPreprocessor_H__

#include <fstream>
using namespace std;

#include "Preprocessor.h"
#include "VssRay.h"

namespace GtpVisibilityPreprocessor {

class VssTree;
class VssTreeLeaf;



/** Sampling based visibility preprocessing. The implementation is based on heuristical
    sampling of view space */
class VssPreprocessor : public Preprocessor {
public:
  
  int mSamplesPerPass;
  int mVssSamplesPerPass;
  int mInitialSamples;
  int mVssSamples;
  bool mUseImportanceSampling;
  bool mEnlargeViewSpace;
  AxisAlignedBox3 *mViewSpaceBox;

  ofstream mStats;
	
  ObjectContainer mObjects;

  /// if initial samples should be loaded from file
  bool mLoadInitialSamples;
  /// if initial samples should be stored in file
  bool mStoreInitialSamples;
  /// if box around view space should be used
  bool mUseViewSpaceBox;
  // rays cast during the processing
  VssRayContainer mVssRays;
	
  VssPreprocessor();
  ~VssPreprocessor();

  virtual bool ComputeVisibility();

  Vector3
  GetViewpoint(AxisAlignedBox3 *viewSpaceBox);

  Vector3
  GetDirection(const Vector3 &viewpoint,
			   AxisAlignedBox3 *viewSpaceBox
			   );
	
  void CastRays(SimpleRayContainer &rays, VssRayContainer &vssRays);

  bool
  ExportRays(const char *filename,
			 const VssRayContainer &vssRays,
			 const int number
			 );

  int
  GenerateImportanceRays(VssTree *vssTree,
						 const int desiredSamples,
						 SimpleRayContainer &rays
						 );


  bool
  ExportVssTreeLeaf(char *filename,
					VssTree *tree,
					VssTreeLeaf *leaf);

  void
  ExportVssTreeLeaves(VssTree *tree, const int number);
	

  bool
  ExportVssTree(char *filename,
				VssTree *tree,
				const Vector3 &dir
				);


  float
  GetAvgPvsSize(VssTree *tree,
				const vector<AxisAlignedBox3> &viewcells
				);
  
  void TestBeamCasting(VssTree *tre, ViewCellsManager *vm, const ObjectContainer &objects);

  bool mTestBeamSampling;

protected:
		
 

	void CastRays16(SimpleRayContainer &rays, 
					VssRayContainer &vssRays,
					const AxisAlignedBox3 &sbox);
};

}

#endif