#ifndef _PlatformHierarchyInterface_H__
#define _PlatformHierarchyInterface_H__

#include <OgreSceneManager.h>
#include <OgrePrerequisites.h>
#include <OgreCamera.h>
#include <OgreRenderSystem.h>

//#include "OgreSolidHalfBoundingBox.h"
#include "OgreSolidBoundingBox.h"
#include "HierarchyInterface.h"
#include "VisibilityInfo.h"
#include "OgrePlatformOcclusionQuery.h"

/** This namespace contains the Ogre dependent classes.
*/
namespace Ogre {

/**	Class which implements a hierarchy interface for a specific type of hierarchy.
	@remark also provides methods for using occlusion queries on the hierarchy nodes
*/
typedef std::vector<PlatformOcclusionQuery *> OcclusionQueryContainer;

class PlatformHierarchyInterface: public GtpVisibility::HierarchyInterface
{
public:
	/** Construction taking the current scene manager and the current rendersystem as argument
		@param sm current scene manager
		@param rsys current render system 
	*/
	PlatformHierarchyInterface(SceneManager *sm, RenderSystem *rsys);
	~PlatformHierarchyInterface();
		
	/** Returns next available occlusion query or creates new one.
		@return the next occlusion query
	*/
	GtpVisibility::OcclusionQuery *GetNextOcclusionQuery();
		
	/** Sets the current camera used for the rendering.
		@param cam the current camera
	*/
	void SetCamera(Camera *cam);
	/** Sets the current camera used for culling.
		@param cam the current camera
		@remark the default is the camera used for rendering
	*/
	void SetCullCamera(Camera *cullCam);
	/** Initialises this scene traverser for the current frame.
		@remark This is a convenience method which resets the stats, 
				sets the current camera, and initialises the distance queue.
		@param cam the actual camera definding the view frustum
		@param cullCam the camera used for culling. 
		@remark If cullCam is null, the actual camera is used for both viewing and culling		
	*/
	void InitTraversal(Camera *cam, Camera *cullCam = NULL, int leavePassesInQueue = 0);
	/** Checks if the node is visible from the current view frustum.
		@param node the current node
		@param intersects returns true if the current node intersects the near plane
	*/
	bool CheckFrustumVisible(GtpVisibility::HierarchyNode *node, bool &intersects);
	/** Sets pointer to the current scene manager.
		@param sm the scene manager 
	*/
	void SetSceneManager(SceneManager *sm);
	/** Sets pointer to the current render system .
		@param rsys the rendersystem 
	*/
	void SetRenderSystem(RenderSystem *rsys);
	/** Returns pointer to bounding box of node.
		@param node current hierarchy node
		@returns bounding box of current node
	*/
	virtual AxisAlignedBox *GetBoundingBox(GtpVisibility::HierarchyNode *node) = 0;
	/** Issue a occlusion query for this node. 
		@param node the current hierarchy node
		@param wasVisible if the node was visible in the last frame
		@returns occlusion query for this node
	*/
	GtpVisibility::OcclusionQuery *IssueNodeOcclusionQuery(
		GtpVisibility::HierarchyNode *node, const bool wasVisible);

	/** Issue a occlusion query for this mesh.
		@param mesh the mesh for which an occlusion query is issued.
		@returns occlusion query for this mesh.
	*/
	GtpVisibility::OcclusionQuery *IssueMeshOcclusionQuery(GtpVisibility::Mesh *mesh);

	/** If true, the interface finds and renders only objects which are marked as shadow casters.
		@remark This is important for the shadow texture pass
	*/
	void SetOnlyShadowCasters(bool onlyShadowCasters);
	/** see set 
	*/
	bool GetOnlyShadowCasters();
	/** see set 
	*/
	bool GetTestGeometryForVisibleLeaves();
	/** see set
	*/
	SceneManager *GetSceneManager();

	/** see set 
	*/
	RenderSystem *GetRenderSystem();
	
	/** true if bounding box query is currently active. 
	*/
    bool IsBoundingBoxQuery();

	GtpVisibility::OcclusionQuery *IssuePatchOcclusionQuery(GtpVisibility::Patch *patch);

	/** Deletes all occlusion queries.
	*/
	void ResetQueries();

protected:
	/** Renders the given geometry 
	*/
	void RenderGeometry(GtpVisibility::Mesh *geom);
	
	/** Renders the given patch 
	*/
	void RenderPatch(GtpVisibility::Patch *patch);

	/** Materials for visualizing frustum and query culled nodes.
	*/
	void CreateNodeVizMaterials();

	/** Returns pointer to current renderable bounding box geometry.
	*/
	SolidBoundingBox *GetSolidBoundingBox();

	/** A pass that prepares an occlusion query.
		@remark disables depth write, colour write, lighting,
		vertex and fragment program.*/
	//void SetOcclusionPass();

	/** Renders given bounding box.
		@param box the bounding box of the scene node to be rendered 
	*/
	void RenderBoundingBox(AxisAlignedBox *box);

	/** Renderable of an aabb.
	*/
	SolidBoundingBox *mSolidBoundingBox;

	SceneManager *mSceneManager;
	RenderSystem *mRenderSystem;

	Camera *mCamera;
	Camera *mCullCamera;

	AxisAlignedBox mBox;
	
	OcclusionQueryContainer mOcclusionQueries;

	Vector3 mCameraPosition;
	bool mOnlyShadowCasters;
	int mLeavePassesInQueue;
	bool mIsBoundingBoxQuery;
};

} // namespace Ogre

#endif // PlatformHierarchyInterface_H