#ifndef __RENDERER_H
#define __RENDERER_H

#include <QtOpenGL>
#include <QWaitCondition>
//#include <QGLPixelBuffer>

#include "Vector3.h"
#include "Containers.h"
#include "Halton.h"
#include "Renderer.h"
#include "Beam.h"

class SceneGraph;
class ViewCellsManager;
class Mesh;
class MeshInstance;
class Intersectable;
class Material;
class Beam;
class KdTree;
class QWidget;
class GlRendererBuffer;
class BeamSampleStatistics;

struct VssRayContainer;

struct PvsRenderStatistics {
  
  float maxError;
  float sumError;
  int frames;
  int errorFreeFrames;

  PvsRenderStatistics() { Reset(); }
  
  void Reset() {
	maxError = 0.0f;
	sumError = 0.0f;
	frames = 0;
	errorFreeFrames = 0;
  }

  float GetMaxError() { return maxError; }
  float GetAvgError() { return sumError/frames; }
  float GetErrorFreeFrames() { return errorFreeFrames/(float)frames; }
  
};


/** Class encapsulating gl rendering for the scene.
	There is no gl context binding so the binding is performed in the
	derived classes
*/

class GlRenderer: public Renderer
{

public:
  ObjectContainer mObjects;
   
  Vector3 mViewPoint;
  Vector3 mViewDirection;

  int timerId;
  bool mUseFalseColors;

  HaltonSequence halton;
  
  int mFrame;
  bool mWireFrame;
  
bool mDetectEmptyViewSpace;
  bool mSnapErrorFrames;
  QString mSnapPrefix;

  KdTree *mKdTree;

  QWaitCondition mRenderingFinished;
  
  
  GlRenderer(SceneGraph *sceneGraph,
			 ViewCellsManager *viewcells,
			 KdTree *tree);
  
  ~GlRenderer();


  void SetupFalseColor(const int id);
  void RenderIntersectable(Intersectable *);
  void RenderViewCell(ViewCell *vc);
  void RenderMeshInstance(MeshInstance *mi);
  void RenderMesh(Mesh *m);
  void SetupMaterial(Material *m);
  virtual void SetupCamera();
  
  bool
  RenderScene();


  virtual void
  SetupProjection(const int w, const int h);

  
  

  void InitGL();

  virtual int GetWidth() const = 0;
  virtual int GetHeight() const = 0;

  int GetId(int r, int g, int b) const;
};


class GlRendererBuffer : public QGLPixelBuffer, public GlRenderer
{
public:
	GlRendererBuffer(const int w,
					 const int h,
					 SceneGraph *sceneGraph,
					 ViewCellsManager *viewcells,
					 KdTree *tree);

  
  void
  EvalPvsStat();

  void
  ClearErrorBuffer();
  

  virtual int GetWidth() const { return width(); }
  virtual int GetHeight() const { return height(); }


  void RandomViewPoint();
  void SampleBeamContributions(
							   Intersectable *sourceObject,
							   Beam &beam,
							   const int samples,
							   BeamSampleStatistics &stat
							   );

  void
  SampleViewpointContributions(
							   Intersectable *sourceObject,
							   const Vector3 viewPoint,
							   Beam &beam,
							   const int desiredSamples,
							   BeamSampleStatistics &stat
							   );

  void InitGL();

  /** Computes rays from information gained with hw sampling-
  */
  void ComputeRays(Intersectable *sourceObj, VssRayContainer &rays);

  int ComputePvs() const;

  float
  GetPixelError();

  int ComputePvs(ObjectContainer &objects, ObjectContainer &pvs) const;

  PvsRenderStatistics mPvsStat;
   
  int mPvsStatFrames;
  vector<float> mPvsErrorBuffer;
private:
	
	static void GenQueries(const int numQueries);
	
	void SetupProjectionForViewPoint(const Vector3 &viewPoint, 
									 const Beam &beam, 
									 Intersectable *sourceObject);
};


class RendererControlWidget : public QWidget
{
  Q_OBJECT
public:
  RendererControlWidget(QWidget * parent = 0, Qt::WFlags f = 0);

  signals:
  
  SetViewCellGranularity(int);
  SetSceneCut(int);
  SetTopDistance(int);

  SetShowViewCells(bool);
  SetTopView(bool);
  SetCutViewCells(bool);
  SetCutScene(bool);

};

class GlRendererWidget : public QGLWidget, public GlRenderer
{
  Q_OBJECT
public:

  // point of the last mouse click used for movement in the scene
  Vector3 mousePoint;

  bool mTopView;
  bool mRenderViewCells;
  bool mCutViewCells;
  bool mCutScene;
  
  Plane3 mSceneCutPlane;
  float mTopDistance;
  
  GlRendererWidget(SceneGraph *sceneGraph,
				   ViewCellsManager *viewcells,
				   KdTree *tree,
				   QWidget * parent = 0, const QGLWidget * shareWidget = 0, Qt::WFlags f = 0
				   );


  virtual void SetupCamera();

  void initializeGL() {
	InitGL();
  }
  void resizeGL(int w, int h);
  void paintGL();
  void timerEvent(QTimerEvent *) {
	  update();
  }

  void mousePressEvent(QMouseEvent *);
  void mouseReleaseEvent(QMouseEvent *);
  void mouseMoveEvent(QMouseEvent *);

  void keyPressEvent ( QKeyEvent * e ) ;
  
  float
  RenderErrors();
  void
  RenderInfo();

  virtual int GetWidth() const { return width(); }
  virtual int GetHeight() const { return height(); }

  virtual void
  SetupProjection(const int w, const int h);

  void
  RenderViewCells();

 public slots:
 void
 SetViewCellGranularity(int number);

 void
 SetSceneCut(int cut);

 void
 SetTopDistance(int dist);

  void SetShowViewCells(bool b) {
	mRenderViewCells = b;
	updateGL();
  }
  
  void SetTopView(bool b) {
	mTopView = b;
	updateGL();
  }

  void SetCutViewCells(bool b) {
	mCutViewCells = b;
	updateGL();
  }
  void SetCutScene(bool b) {
	mCutScene = b;
	updateGL();
  }

};


extern GlRendererWidget *rendererWidget;

class GlDebuggerWidget : public QGLWidget
{
	Q_OBJECT
public:
    GlDebuggerWidget(GlRendererBuffer *buf, QWidget *parent = NULL);
    ~GlDebuggerWidget();
    void initializeGL();
    void resizeGL(int w, int h);
    void paintGL();
    void timerEvent(QTimerEvent *) { update(); }
    void mousePressEvent(QMouseEvent *) { killTimer(timerId); }
    void mouseReleaseEvent(QMouseEvent *) { timerId = startTimer(20); }

    void initCommon();
    void initPbuffer();

  
	 GlRendererBuffer *mRenderBuffer;

	 Beam mBeam;
	 int mSamples;
	 Intersectable *mSourceObject;

private:
    GLuint dynamicTexture;
    int timerId;
};

extern GlDebuggerWidget *debuggerWidget;

#endif