/**
    \file 
        TestCullingApplication.cpp
    \brief
        Tests the occlusion 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 "TestCullingApplication.h"
#include "OgreOcclusionCullingSceneTraverser.h"

#define WIN32_LEAN_AND_MEAN
#include "windows.h"

RaySceneQuery* raySceneQuery = 0;

/***********************************************/
/* TestCullingApplication implementation       */
/***********************************************/
TestCullingApplication::~TestCullingApplication()
{
	delete raySceneQuery;
}
//-----------------------------------------------------------------------
void TestCullingApplication::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 TestCullingApplication::createScene(void)
{
	Plane waterPlane;
	// 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);
	mSceneMgr->setFog( FOG_LINEAR, fadeColour, .001, 500, 1000);
	mWindow->getViewport(0)->setBackgroundColour(fadeColour);

	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);
	}

	// 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;

	// Set a nice viewpoint
	mCamera->setPosition(707,2500,528);
	mCamera->setOrientation(Quaternion(-0.3486, 0.0122, 0.9365, 0.0329));

	raySceneQuery = mSceneMgr->createRayQuery(
	Ray(mCamera->getPosition(), Vector3::NEGATIVE_UNIT_Y));

     // Create a skybox
  //   mSceneMgr->setSkyBox(true, "Examples/SpaceSkyBox");

	 // CEGUI setup
	 setupGui();
}
//-----------------------------------------------------------------------
void TestCullingApplication::setupGui( void )
{
	 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( );
     
	/* CEGUI::Window* sheet = 
            CEGUI::WindowManager::getSingleton().loadWindowLayout(
                (CEGUI::utf8*)"ogregui.layout"); 

     mGUISystem->setGUISheet(sheet);*/
}
//-----------------------------------------------------------------------
void TestCullingApplication::createFrameListener(void)
{
	mFrameListener= new MouseQueryListener(mWindow, mCamera, mSceneMgr, mGUIRenderer);
	mFrameListener->showDebugOverlay(true);
	mRoot->addFrameListener(mFrameListener);
}
//-----------------------------------------------------------------------
void TestCullingApplication::chooseSceneManager(void)
{
    //mSceneMgr = mRoot->getSceneManager(ST_GENERIC);
	mSceneMgr = mRoot->getSceneManager(ST_EXTERIOR_CLOSE);
}

/***********************************************/
/* MouseQueryListener implementation           */
/***********************************************/

//-----------------------------------------------------------------------
MouseQueryListener::MouseQueryListener(RenderWindow* win, Camera* cam, SceneManager *sceneManager, CEGUI::Renderer *renderer)
        : ExampleFrameListener(win, cam, false, true), mGUIRenderer(renderer), 
		mShutdownRequested(false)
{

	// Setup default variables
//	mCurrentObject = NULL;
	mLMouseDown = false;
	mRMouseDown = false;
	mSceneMgr = sceneManager;

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

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

	// show overlay
	Overlay* pOver = OverlayManager::getSingleton().getByName("Example/OcclusionDemoOverlay"); 

	mAlgorithmInfo = OverlayManager::getSingleton().getOverlayElement("Example/Occlusion/AlgorithmInfo");
	mThresholdInfo = OverlayManager::getSingleton().getOverlayElement("Example/Occlusion/ThresholdInfo");
	mFrustumCulledNodesInfo = OverlayManager::getSingleton().getOverlayElement("Example/Occlusion/FrustumCulledNodesInfo");
	mQueryCulledNodesInfo = OverlayManager::getSingleton().getOverlayElement("Example/Occlusion/QueryCulledNodesInfo");
    mTraversedNodesInfo = OverlayManager::getSingleton().getOverlayElement("Example/Occlusion/TraversedNodesInfo");

	mAlgorithmInfo->setCaption(": " + mCurrentAlgorithmCaptions[mCurrentAlgorithm]);
	mThresholdInfo->setCaption(": 0");
	mFrustumCulledNodesInfo->setCaption(": 0");
	mQueryCulledNodesInfo->setCaption(": 0");
	mTraversedNodesInfo->setCaption(": 0");

    pOver->show();
} // MouseQueryListener
//-----------------------------------------------------------------------
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( );
		 mLMouseDown = true;
     } // if
     // 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 )
	 {
		mShipNode->translate(-e->getRelX() * 200, -e->getRelY() * 200, 0.0);
     }
	 */
	 
	 // 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
	static Ray updateRay;
	updateRay.setOrigin(mCamera->getPosition());
	updateRay.setDirection(Vector3::NEGATIVE_UNIT_Y);
	raySceneQuery->setRay(updateRay);
	RaySceneQueryResult& qryResult = raySceneQuery->execute();
	RaySceneQueryResult::iterator i = qryResult.begin();
	 
	if (i != qryResult.end() && i->worldFragment)
	{
		SceneQuery::WorldFragment* wf = i->worldFragment;
		mCamera->setPosition(mCamera->getPosition().x, 
			i->worldFragment->singleIntersection.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, 0.3, 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 % OcclusionCullingSceneTraverser::NUM_RENDERMODES;

	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);
}
//-----------------------------------------------------------------------
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
    TestCullingApplication 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;
}