#ifndef _SceneGraph_H__
#define _SceneGraph_H__

#include <string>
#include "Containers.h"
#include "AxisAlignedBox3.h"


namespace GtpVisibilityPreprocessor {


/** Basic scene graph node, we are interested only in bounding boxes and topology
    of the scene graph 
*/
class SceneGraphNode 
{
public:

	virtual ~SceneGraphNode();
	virtual bool IsLeaf() const = 0;

	virtual void UpdateBox() = 0;

//protected:

	AxisAlignedBox3 mBox;
};
  


/** Scene graph interior node.
*/
class SceneGraphInterior: public SceneGraphNode 
{
public:
	virtual bool IsLeaf() const { return false; }
	virtual void UpdateBox();

//protected:

	NodeContainer mChildren;
};


/** Scene graph leaf node.
*/
class SceneGraphLeaf: public SceneGraphNode 
{
public:

	virtual bool IsLeaf() const { return true; }
	virtual void UpdateBox();

//protected:

	MeshContainer mGeometry;
};



/** Scene graph class */
class SceneGraph {

public:

	SceneGraph();
	~SceneGraph();
	
	bool Export(const std::string filename);
  
	int CollectObjects(ObjectContainer *instances);
  
	int AssignObjectIds();
  
	void GetStatistics(int &intersectables, int &faces) const;

	AxisAlignedBox3 GetBox() const { return mRoot->mBox; }
  
	/** Exports binary version of the scene.
	*/
	void ExportScene(const std::string filename);

	/** Loads binary version of the scene.
	*/
	void LoadScene(const std::string filename);

	SceneGraphNode *GetRoot();

	void SetRoot(SceneGraphNode *sgNnode);


protected:

	 SceneGraphNode *mRoot;
};


}

#endif