#ifndef __INTERSECTABLE_H
#define __INTERSECTABLE_H

#include "AxisAlignedBox3.h"
#include "Pvs.h"

struct VssRayContainer;

class Intersectable {
public:
  // last mail id -> warning not thread safe!
  // both mailId and mailbox should be unique for each thread!!!
  static int sMailId;
  static int sReservedMailboxes;
  int mMailbox;
  
  // unique object Id
  int mId;
  
  // universal counter
  int mCounter;
	
  // object based pvs
  KdPvs mKdPvs;
  
  enum { MESH_INSTANCE, TRANSFORMED_MESH_INSTANCE, SPHERE, VIEW_CELL };
  
  Intersectable():mMailbox(0) {}

	void SetId(const int id) { mId = id; }
	int GetId() { return mId; }
	

	static void NewMail(const int reserve = 1) {
		sMailId += sReservedMailboxes;
		sReservedMailboxes = reserve;
	}
	
	void Mail() { mMailbox = sMailId; }
  bool Mailed() const { return mMailbox == sMailId; }

	void Mail(const int mailbox) { mMailbox = sMailId + mailbox; }
	bool Mailed(const int mailbox) const { return mMailbox == sMailId + mailbox; }

	int IncMail() { return ++mMailbox - sMailId; }


	
  virtual AxisAlignedBox3 GetBox() = 0;
  
  virtual int CastRay(Ray &ray) = 0;
  
  virtual bool IsConvex() = 0;
  virtual bool IsWatertight() = 0;
  virtual float IntersectionComplexity() = 0;
  
  virtual int NumberOfFaces() const = 0;

  virtual int Type() const = 0;
  
  virtual int GetRandomSurfacePoint(Vector3 &point, Vector3 &normal) = 0;
  
  virtual int
  GetRandomVisibleSurfacePoint(Vector3 &point,
							   Vector3 &normal,
							   const Vector3 &viewpoint,
															 const int maxTries
							   ) = 0;
  
  virtual ostream &Describe(ostream &s) = 0;
  
  virtual int GenerateSilhouetteRays(const int nrays,
									 const AxisAlignedBox3 &originBox,
									 const AxisAlignedBox3 &directionBox,
									 VssRayContainer &rays
									 ) {return 0;}

  static bool GreaterCounter(const Intersectable *a,
							 const Intersectable *b) {
	return a->mCounter > b->mCounter;
  }
};


#endif