#ifndef _RenderSimulator_h__
#define _RenderSimulator_h__

#include "common.h"
#include "Statistics.h"

class BspTree;
class KdTree;
class ViewCell;
class KdLeaf;

class SimulationStatistics: public StatisticsBase
{
public:
	/// view cell with the biggest "cost"
	float maxCost;
	/// view cell with the minimal "cost"
    float minCost;
	/// average render time
	float avgRenderTime;
	/// average render time with the overhead when crossing view cells
	float avgRtWithoutOverhead;
  
	void Reset() 
	{
		maxCost = 0;
		minCost = 999999;
		avgRenderTime = 0;
		avgRtWithoutOverhead = 0;
	}

	void Print(ostream &app) const;

	friend ostream &operator<<(ostream &s, const SimulationStatistics &stat) 
	{
		stat.Print(s);
		return s;
	}  
};

/** Simulated rendering using a simple render heuristics. Used to evaluate the 
	quality of the view cell partition.
*/
class RenderSimulator
{

public:
	RenderSimulator();
	/** Constructor taking the estimated render cost, 
		the view cell overhead,
		and the average move speed of the player into account.
	*/
	RenderSimulator(float objRendercost, float vcOverhead, float moveSpeed);

	/** Simulates rendering of the view cells.
		@returns the statistics of the simulation.
	*/
	virtual SimulationStatistics SimulateRendering() = 0;

	/** Sets estimated render time for a single object in the PVS.
	*/
	void SetObjectRenderCost(const float objRenderCost);

	/** Contant overhead for crossing a view cell border.
	*/
	void SetVcOverhead(const float vcOverhead);

	/** Average move speed of the player during rendering.
	*/
	void SetMoveSpeed(const float moveSpeed);


protected:

	/// render time for single object of the PVS
	float mObjRenderCost;
	/// const overhead for crossing a view cell border
	float mVcOverhead;
	/// move speed of player
	float mMoveSpeed;
};

class BspRenderSimulator: public RenderSimulator
{
public:
	BspRenderSimulator(BspTree *bspTree);

	BspRenderSimulator(float objRenderCost, 
							   float vcOverhead, 
							   float moveSpeed, 
							   BspTree *bspTree);

	SimulationStatistics SimulateRendering();

protected:
	/** Simulates rendering of the pvs of one view cell, with given rendering time for an object.
		@param viewCell the view cell holding the Pvs
		@param objRenderTime estimated render time for one object of the Pvs
	*/
	Real RenderPvs(ViewCell &viewCell, const float objRenderTime) const;

	BspTree *mBspTree;
};

class KdRenderSimulator: public RenderSimulator
{
public:
	KdRenderSimulator(KdTree *kdTree);

	KdRenderSimulator(float objRenderCost, 
							  float vcOverhead, 
							  float moveSpeed, 
							  KdTree *kdTree);
	SimulationStatistics SimulateRendering();

protected:

	Real RenderPvs(KdLeaf *leaf, float objRenderTime) const;

	KdTree *mKdTree;
};

#endif // RenderSimulator