/**
    \file 
        TestCullingTerrainApplication.cpp
    \brief
        Tests the visibility culling algorithm
*/

#include <OgreNoMemoryMacros.h>
#include <CEGUI/CEGUI.h>
#include <../CEGUIRenderer/include/OgreCEGUIRenderer.h>
#include <../CEGUIRenderer/include/OgreCEGUIResourceProvider.h>
#include <../CEGUIRenderer/include/OgreCEGUITexture.h>
#include <OgreMemoryMacros.h>

#include "Ogre.h"
#include "TestCullingTerrainApplication.h"

#define WIN32_LEAN_AND_MEAN
#include "windows.h"


/*******************************************************/
/*     TestCullingTerrainApplication implementation    */
/*******************************************************/
TestCullingTerrainApplication::~TestCullingTerrainApplication()
{
	delete mSceneContentGenerator;
}
//-----------------------------------------------------------------------
void TestCullingTerrainApplication::createCamera( void )
{
	// Create the camera
	mCamera = mSceneMgr->createCamera("PlayerCam");

	// Position it at 500 in Z direction
	mCamera->setPosition(Vector3(128,25,128));

	// Look back along -Z
    mCamera->lookAt(Vector3(0,0,-300));
    mCamera->setNearClipDistance(1);
    mCamera->setFarClipDistance(1000);
}
//-----------------------------------------------------------------------
void TestCullingTerrainApplication::createScene()
{
	// Set ambient light
	mSceneMgr->setAmbientLight(ColourValue(0.5, 0.5, 0.5));
	
	// Create a light
	Light* l = mSceneMgr->createLight("MainLight");
	// Accept default settings: point light, white diffuse, just set position
	// NB I could attach the light to a SceneNode if I wanted it to move automatically with
	//  other objects, but I don't
	l->setPosition(20,80,50);

	// --Fog
	// NB it's VERY important to set this before calling setWorldGeometry 
	// because the vertex program picked will be different
	ColourValue fadeColour(0.93, 0.86, 0.76);
	mWindow->getViewport(0)->setBackgroundColour(fadeColour);
	//mSceneMgr->setFog( FOG_LINEAR, fadeColour, .001, 500, 1000);

	// Create a skybox
    //mSceneMgr->setSkyBox(true, "Examples/SpaceSkyBox", 500, false);
	//mSceneMgr->setSkyDome( true, "Examples/CloudySky", 5, 8, 500, false );

	/*	// Define the required skyplane
	Plane plane;
	// 5000 world units from the camera
	plane.d = 5000;
	// Above the camera, facing down
	plane.normal = -Vector3::UNIT_Y;
	// Create the plane 10000 units wide, tile the texture 3 times
    mSceneMgr->setSkyPlane(true, plane, "Examples/SpaceSkyPlane",10000,3);*/

	std::string terrain_cfg("terrain.cfg");
#if OGRE_PLATFORM == OGRE_PLATFORM_APPLE
	terrain_cfg = mResourcePath + terrain_cfg;
#endif
	mSceneMgr->setWorldGeometry(terrain_cfg);
	// Infinite far plane?
	if (mRoot->getRenderSystem()->getCapabilities()->hasCapability(RSC_INFINITE_FAR_PLANE))
	{
		mCamera->setFarClipDistance(0);
	}

	// Set a nice viewpoint
	mCamera->setPosition(707,2500,528);
	mCamera->setOrientation(Quaternion(-0.3486, 0.0122, 0.9365, 0.0329));
	
	// CEGUI setup
	setupGui();
	// HACK: necessary to call once before the content creation for
	// terrain initialisation
	mSceneMgr->_renderScene(mCamera, mWindow->getViewport(0), true);

	mSceneContentGenerator = new TerrainContentGenerator(mSceneMgr);
	mSceneContentGenerator->GenerateScene(300, "robot.mesh");
	// no limitations now: the user can set objects also on peaks
	mSceneContentGenerator->SetMaxHeight(5000); 
}
//-----------------------------------------------------------------------
void TestCullingTerrainApplication::setupGui()
{
	 mGUIRenderer = new CEGUI::OgreCEGUIRenderer(mWindow, Ogre::RENDER_QUEUE_OVERLAY, 
		 false, 3000, ST_EXTERIOR_CLOSE);
     mGUISystem = new CEGUI::System(mGUIRenderer);

	 // Mouse
     CEGUI::SchemeManager::getSingleton().loadScheme((CEGUI::utf8*)"TaharezLook.scheme");
     CEGUI::MouseCursor::getSingleton().setImage("TaharezLook", "MouseArrow");
	 mGUISystem->setDefaultMouseCursor(
                (CEGUI::utf8*)"TaharezLook", (CEGUI::utf8*)"MouseArrow");

	 CEGUI::MouseCursor::getSingleton().show();
}
//-----------------------------------------------------------------------
void TestCullingTerrainApplication::createFrameListener()
{
	mFrameListener= new MouseQueryListener(mWindow, mCamera, mSceneMgr, 
		mGUIRenderer, mSceneContentGenerator);
	mFrameListener->showDebugOverlay(true);
	mRoot->addFrameListener(mFrameListener);
}
//-----------------------------------------------------------------------
void TestCullingTerrainApplication::chooseSceneManager()
{
	mSceneMgr = mRoot->getSceneManager(ST_EXTERIOR_CLOSE);
}
/***********************************************/
/*      MouseQueryListener implementation      */
/***********************************************/
//-----------------------------------------------------------------------
MouseQueryListener::MouseQueryListener(RenderWindow* win, Camera* cam, 
									   SceneManager *sceneManager, 
									   CEGUI::Renderer *renderer,
									   TerrainContentGenerator *sceneGenerator): 
ExampleFrameListener(win, cam, false, true), mGUIRenderer(renderer), 
mShutdownRequested(false)
{
	// Setup default variables
	mCurrentObject = NULL;
	mLMouseDown = false;
	mRMouseDown = false;
	mSceneMgr = sceneManager;
	mSceneContentGenerator = sceneGenerator;

    // Reduce move speed
	mMoveSpeed = 50;
	mRotateSpeed *= 2;

	mCurrentAlgorithm = GtpVisibility::VisibilityEnvironment::COHERENT_HIERARCHICAL_CULLING,
	mThreshold = 0;
    
	// Register this so that we get mouse events.
	mEventProcessor->addMouseListener(this);
	mEventProcessor->addMouseMotionListener(this);
	mEventProcessor->addKeyListener(this);

	mRayQueryExecutor = new RayQueryExecutor(mSceneMgr);
	
	// show overlay
	Overlay* pOver = OverlayManager::getSingleton().getByName("Example/VisibilityDemoOverlay"); 

	mAlgorithmInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/AlgorithmInfo");
	mThresholdInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/ThresholdInfo");
	mFrustumCulledNodesInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/FrustumCulledNodesInfo");
	mQueryCulledNodesInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/QueryCulledNodesInfo");
    mTraversedNodesInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/TraversedNodesInfo");
	mHierarchyNodesInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/HierarchyNodesInfo");
	mRenderedNodesInfo = OverlayManager::getSingleton().getOverlayElement("Example/Visibility/RenderedNodesInfo");

	mAlgorithmInfo->setCaption(": " + mCurrentAlgorithmCaptions[mCurrentAlgorithm]);
	mThresholdInfo->setCaption(": 0");
	mFrustumCulledNodesInfo->setCaption(": 0");
	mQueryCulledNodesInfo->setCaption(": 0");
	mTraversedNodesInfo->setCaption(": 0");
	mHierarchyNodesInfo->setCaption(": 0");
	mRenderedNodesInfo->setCaption(": 0");
		
    pOver->show();
} 
//-----------------------------------------------------------------------
MouseQueryListener::~MouseQueryListener( )
{
	delete mRayQueryExecutor;
}
//-----------------------------------------------------------------------
void MouseQueryListener::mouseMoved (MouseEvent *e)
{
	// Update CEGUI with the mouse motion
    CEGUI::System::getSingleton().injectMouseMove(e->getRelX() * mGUIRenderer->getWidth(), 
		e->getRelY() * mGUIRenderer->getHeight());
}
//-----------------------------------------------------------------------
void MouseQueryListener::mousePressed(MouseEvent* e)
{
     // Left mouse button down
     if (e->getButtonID() & InputEvent::BUTTON0_MASK)
     {
		 CEGUI::MouseCursor::getSingleton().hide();

		 // Setup the ray scene query
         Ray mouseRay = mCamera->getCameraToViewportRay(e->getX(), e->getY());
   
		 Vector3 queryResult;
		 
		 // Get results, create a node/entity on the position
		 mCurrentObject = mSceneContentGenerator->GenerateSceneObject(
			 mouseRay.getOrigin(), mouseRay.getDirection(), "robot.mesh");
		
         mLMouseDown = true; 
     }
     // Right mouse button down
     else if (e->getButtonID() & InputEvent::BUTTON1_MASK)
     {
         CEGUI::MouseCursor::getSingleton().hide();
         mRMouseDown = true;
     } // else if
} // mousePressed

 //-----------------------------------------------------------------------
void MouseQueryListener::mouseReleased(MouseEvent* e)
{
    // Left mouse button up
    if (e->getButtonID() & InputEvent::BUTTON0_MASK)
    {
		CEGUI::MouseCursor::getSingleton().show();
        mLMouseDown = false;
    }
    // Right mouse button up
    else if (e->getButtonID() & InputEvent::BUTTON1_MASK)
    {
        CEGUI::MouseCursor::getSingleton().show();
        mRMouseDown = false;
    }
} 
//-----------------------------------------------------------------------
void MouseQueryListener::mouseDragged(MouseEvent *e)
 {
	 // If we are dragging the left mouse button.	 	 
	 if (mLMouseDown)
     {
		 Vector3 queryResult;
		 Ray mouseRay = mCamera->getCameraToViewportRay(e->getX(), e->getY());

		 if(mRayQueryExecutor->executeRayQuery(&queryResult, mouseRay))
		 {
			 if(mCurrentObject)
				 mCurrentObject->setPosition(queryResult);
		 }
     }
	 // If we are dragging the right mouse button.
	 if (mRMouseDown)
	 {
		 mCamera->yaw( -e->getRelX() * mRotateSpeed );
		 mCamera->pitch( -e->getRelY() * mRotateSpeed );
	 }
}
//-----------------------------------------------------------------------
bool MouseQueryListener::frameStarted(const FrameEvent &evt)
{
	// clamp to terrain
	Vector3 camPos = mCamera->getPosition();
	Vector3 queryResult;

    if(mRayQueryExecutor->executeRayQuery(&queryResult, 
		Vector3(camPos.x, 5000.0f, camPos.z), Vector3::NEGATIVE_UNIT_Y))
	{
		mCamera->setPosition(mCamera->getPosition().x, queryResult.y + 10, 
			mCamera->getPosition().z);
	}
	
	return ExampleFrameListener::frameStarted(evt);
}
//-----------------------------------------------------------------------
bool MouseQueryListener::frameEnded(const FrameEvent& evt)
{
	if (mShutdownRequested)
		return false;

    if (timeDelay >= 0) 
        timeDelay -= evt.timeSinceLastFrame;

    KEY_PRESSED(KC_SPACE, 0.3, changeAlgorithm());

	KEY_PRESSED(KC_SUBTRACT, 0, changeThreshold(-10));
	KEY_PRESSED(KC_ADD, 0, changeThreshold(10));
	//KEY_PRESSED(KC_T, 1, change);
      
	changeStats();

    return ExampleFrameListener::frameStarted(evt) && ExampleFrameListener::frameEnded(evt);        
}
//-----------------------------------------------------------------------
void MouseQueryListener::changeThreshold(int incr)
{
	mThreshold += incr; if(mThreshold < 0) mThreshold = 0;
	
	char str[100]; sprintf(str,": %d", mThreshold);

	mSceneMgr->setOption("Threshold", &mThreshold); 
	mThresholdInfo->setCaption(str);
}
//-----------------------------------------------------------------------
void MouseQueryListener::changeAlgorithm()
{
	mCurrentAlgorithm = ++mCurrentAlgorithm % 
		GtpVisibility::VisibilityEnvironment::NUM_CULLING_MANAGERS,

	mAlgorithmInfo->setCaption(": " + mCurrentAlgorithmCaptions[mCurrentAlgorithm]);
	mSceneMgr->setOption("Algorithm", &mCurrentAlgorithm);
}
//-----------------------------------------------------------------------
void MouseQueryListener::changeStats()
{
	unsigned int opt = 0;
	char str[100];
	
	mSceneMgr->getOption("NumFrustumCulledNodes", &opt); sprintf(str,": %d", opt); 
	mFrustumCulledNodesInfo->setCaption(str);
	
	mSceneMgr->getOption("NumQueryCulledNodes", &opt); sprintf(str,": %d", opt); 
	mQueryCulledNodesInfo->setCaption(str);
	
	mSceneMgr->getOption("NumTraversedNodes", &opt); sprintf(str,": %d", opt); 
	mTraversedNodesInfo->setCaption(str);

	mSceneMgr->getOption("NumHierarchyNodes", &opt); sprintf(str,": %d", opt); 
	mHierarchyNodesInfo->setCaption(str);

	mSceneMgr->getOption("NumRenderedNodes", &opt); sprintf(str,": %d", opt); 
	mRenderedNodesInfo->setCaption(str);
}
//-----------------------------------------------------------------------
void MouseQueryListener::keyPressed(KeyEvent* e)
{
	if(e->getKey() == KC_ESCAPE)
    {
		mShutdownRequested = true;
		e->consume();
		return;
	}

	CEGUI::System::getSingleton().injectKeyDown(e->getKey());
	CEGUI::System::getSingleton().injectChar(e->getKeyChar());
	e->consume();
}
//-----------------------------------------------------------------------
void MouseQueryListener::keyReleased(KeyEvent* e)
{
	CEGUI::System::getSingleton().injectKeyUp(e->getKey());
	e->consume();
}
//-----------------------------------------------------------------------
void MouseQueryListener::keyClicked(KeyEvent* e) 
{
	// Do nothing
	e->consume();
}
//-----------------------------------------------------------------------
INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR strCmdLine, INT )
{
    // Create application object
    TestCullingTerrainApplication app;

	try 
	{
        app.go();
    } 
	catch( Ogre::Exception& e ) 
	{
        MessageBox( NULL, e.getFullDescription().c_str(), 
			"An exception has occured!", MB_OK | MB_ICONERROR | MB_TASKMODAL);
    }	

    return 0;
}