#include "OgreVisibilityTerrainSceneManager.h"
#include "OgreOctreeHierarchyInterface.h"
#include "OgreVisibilityOptionsManager.h"
#include <OgreMath.h>
#include <OgreIteratorWrappers.h>
#include <OgreRenderSystem.h>
#include <OgreCamera.h>

#include <windows.h>

namespace Ogre {

//-----------------------------------------------------------------------
VisibilityTerrainSceneManager::VisibilityTerrainSceneManager(
	GtpVisibility::VisibilityManager *visManager)
: mVisibilityManager(visManager), mUseCulling(true)
{
	mHierarchyInterface = 
		new OctreeHierarchyInterface(this, mDestRenderSystem);

	//mDisplayNodes = true;
	//mShowBoundingBoxes = true;
	mMaxDepth = 20;
}
//-----------------------------------------------------------------------
VisibilityTerrainSceneManager::~VisibilityTerrainSceneManager()
{
	delete mHierarchyInterface;
}
//-----------------------------------------------------------------------
void VisibilityTerrainSceneManager::_renderVisibleObjects()
{
	mHierarchyInterface->InitFrame(mOctree, mCameraInProgress);
	mVisibilityManager->GetCullingManager()->InitFrame();

	if(!mUseCulling)
	{	
		OctreeSceneManager::_renderVisibleObjects();
		return;
	} 
	
	//-- hierarchical culling
	// the objects of different layers (e.g., background, scene, 
	// overlay) must be identified and rendered one after another

	//-- render background
	clearSpecialCaseRenderQueues();
	addSpecialCaseRenderQueue(RENDER_QUEUE_BACKGROUND);
	addSpecialCaseRenderQueue(RENDER_QUEUE_SKIES_EARLY);

	setSpecialCaseRenderQueueMode(SceneManager::SCRQM_INCLUDE);
	SceneManager::_renderVisibleObjects();
#ifdef GTP_VISIBILITY_MODIFIED_OGRE
	_deleteRenderedQueueGroups();
#endif

	//-- render visible objects (i.e., all but overlay)
	clearSpecialCaseRenderQueues();
	addSpecialCaseRenderQueue(RENDER_QUEUE_OVERLAY);
	setSpecialCaseRenderQueueMode(SceneManager::SCRQM_EXCLUDE);

	//-- the hierarchical culling algorithm
	mVisibilityManager->ApplyVisibilityCulling();

#ifdef GTP_VISIBILITY_MODIFIED_OGRE
	_deleteRenderedQueueGroups();
#endif

	//-- render overlay
	clearSpecialCaseRenderQueues();
	SceneManager::_renderVisibleObjects();
}
//-----------------------------------------------------------------------
void VisibilityTerrainSceneManager::_findVisibleObjects(Camera* cam, bool onlyShadowCasters)
{
	// empty if hierarchical culling is used =>
	// we interleave identification and rendering of objects 
	// in _renderVisibibleObjects 
	if(!mUseCulling)
	{
		OctreeSceneManager::_findVisibleObjects(cam, onlyShadowCasters);
	}
}
//-----------------------------------------------------------------------
void VisibilityTerrainSceneManager::_updateSceneGraph(Camera* cam)
{
	//mHierarchyInterface->setNumSceneNodes((int)mSceneNodes.size());
	mVisibilityManager->GetCullingManager()->SetHierarchyInterface(mHierarchyInterface);
	mHierarchyInterface->SetRenderSystem(mDestRenderSystem);

#ifdef GTP_VISIBILITY_MODIFIED_OGRE
    mHierarchyInterface->SetNumOctreeNodes(mNumOctreeNodes);
#endif
	TerrainSceneManager::_updateSceneGraph(cam);
}
//-----------------------------------------------------------------------
bool VisibilityTerrainSceneManager::setOption(const String & key, const void * val)
{
	if (key == "UseCulling")
	{
		mUseCulling = (*static_cast<const bool *>(val));
		return true;
	}

	return VisibilityOptionsManager(mVisibilityManager, mHierarchyInterface).
		setOption(key, val) || TerrainSceneManager::setOption(key, val);
}
//-----------------------------------------------------------------------
bool VisibilityTerrainSceneManager::getOption(const String & key, void *val)
{
	if (key == "NumHierarchyNodes")
	{
		* static_cast<unsigned int *>(val) = (unsigned int)mNumOctreeNodes;
		return true;
	}
	
	return VisibilityOptionsManager(mVisibilityManager, mHierarchyInterface).
		getOption(key, val) && TerrainSceneManager::getOption(key, val);
}
//-----------------------------------------------------------------------
bool VisibilityTerrainSceneManager::getOptionValues(const String & key, StringVector  &refValueList)
{
	return TerrainSceneManager::getOptionValues( key, refValueList);
}
//-----------------------------------------------------------------------
bool VisibilityTerrainSceneManager::getOptionKeys(StringVector & refKeys)
{
	return VisibilityOptionsManager(mVisibilityManager, mHierarchyInterface).
		getOptionKeys(refKeys) || TerrainSceneManager::getOptionKeys(refKeys);
}
//-----------------------------------------------------------------------
void VisibilityTerrainSceneManager::setVisibilityManager(GtpVisibility::VisibilityManager *visManager)
{
	mVisibilityManager = visManager;
}
//-----------------------------------------------------------------------
GtpVisibility::VisibilityManager *VisibilityTerrainSceneManager::getVisibilityManager( void )
{
	return mVisibilityManager;
}
} // namespace Ogre