#ifndef __RAYINFO_H__
#define __RAYINFO_H__

#include <vector>
using namespace std;

namespace GtpVisibilityPreprocessor {

class VssRay;
class RayInfo;
class Plane3;
class Vector3;


typedef vector<RayInfo> RayInfoContainer;


/** Structure holding additional info about
	the ray during traversal.
*/
class RayInfo
{
public:
	/// pointer to the actual ray
	VssRay *mRay;
	
	// endpoints  - do we need them?
#if USE_FIXEDPOINT_T
	short mMinT, mMaxT;
#else
	float mMinT, mMaxT;
#endif
	
	RayInfo();
	
	RayInfo(VssRay *r);
	
	RayInfo(VssRay *r, const float _min, const float _max);
	
	RayInfo(VssRay *r, const short _min, const float _max); 
	
	RayInfo(VssRay *r, const float _min, const short _max);
		
	friend bool operator<(const RayInfo &a, const RayInfo &b) 
	{
		return a.mRay < b.mRay;
	}
	
	/** Extracts the scalar of the starting point of the ray segment
		that lies in the axis.
	*/
	float ExtrapOrigin(const int axis) const;
	/** Extracts the scalar of the termination point of the ray segment
		that lies in the axis.
	*/
	float ExtrapTermination(const int axis) const;
	
	/** Extracts the starting point of the ray segment.
	*/
	Vector3 ExtrapOrigin() const;
	
	/** Extracts the end point of the ray segment.
	*/
	Vector3 ExtrapTermination() const;
	
	float GetMinT () const;
	float GetMaxT () const;
	
	void SetMinT (const float t);
	
	void SetMaxT (const float t);

	float SegmentLength() const;
	float SqrSegmentLength() const;

	/** Computes intersection of this ray with the axis aligned split plane.
	
		@param axis axis of the split plane
		@param position scalar position of the split plane for the chosen axis
		@param t returns the t parameter value of the ray intersection

		@returns 0 if ray intersects plane, -1 if on back side of plane, 1 if on front side
	*/
	int ComputeRayIntersection(const int axis, const float position, float &t) const;

	/** Computes intersection of this ray with the split plane.

		@param splitPlane the split plane
		@param t returns the t parameter value of the ray intersection

		@returns 0 if ray intersects plane, -1 if on back side of plane, 1 if on front side
	*/
	int ComputeRayIntersection(const Plane3 &splitPlane, float &t) const;

	friend void GetRayInfoSets(const RayInfoContainer &sourceRays,
							   const int maxSize,
							   RayInfoContainer &usedRays,
							   RayInfoContainer *savedRays = NULL);
};

}
#endif