/*	==========================================================================
 *	(C) 2006 Universitat Jaume I
 *	==========================================================================
 *	PROYECT:	GAME TOOLS
 *	==========================================================================*/
/**	CONTENT:	
	*
	*
	*	@file	main.cpp
/** COMMENTS:
	* Model must be in "media/models" folder.
	* Lod file must be in "media/GT" folder.
/*===========================================================================*/
#include "ExampleApplication.h"
#include "GeoLodStripsLibrary.h"
#include "GeoMeshLoader.h"


// Distance values
#define dist_min 1200
#define dist_max 2000

// Model name
#define model_name "dwarf2"


//Global variables
Entity* entity;
Geometry::LodStripsLibrary* myStrips;
Ogre::Mesh *ogreMesh=NULL;
Geometry::GeoMeshLoader *meshloader=NULL;
SceneNode* node;

MaterialPtr *mat;

ColourValue color=ColourValue::Red;

Camera* theCam;
Entity* pPlaneEnt;
std::vector<Entity*> belowWaterEnts;
std::vector<Entity*> aboveWaterEnts;

Plane reflectionPlane;

OverlayElement* mInfo;
OverlayElement* mInfo2;

class RefractionTextureListener : public RenderTargetListener
{
public:
    void preRenderTargetUpdate(const RenderTargetEvent& evt)
    {
        // Hide plane and objects above the water
        pPlaneEnt->setVisible(false);
        std::vector<Entity*>::iterator i, iend;
        iend = aboveWaterEnts.end();
        for (i = aboveWaterEnts.begin(); i != iend; ++i)
        {
            (*i)->setVisible(false);
        }

    }
    void postRenderTargetUpdate(const RenderTargetEvent& evt)
    {
        // Show plane and objects above the water
        pPlaneEnt->setVisible(true);
        std::vector<Entity*>::iterator i, iend;
        iend = aboveWaterEnts.end();
        for (i = aboveWaterEnts.begin(); i != iend; ++i)
        {
            (*i)->setVisible(true);
        }
    }

};
class ReflectionTextureListener : public RenderTargetListener
{
public:
    void preRenderTargetUpdate(const RenderTargetEvent& evt)
    {
        // Hide plane and objects below the water
        pPlaneEnt->setVisible(false);
        std::vector<Entity*>::iterator i, iend;
        iend = belowWaterEnts.end();
        for (i = belowWaterEnts.begin(); i != iend; ++i)
        {
            (*i)->setVisible(false);
        }
        theCam->enableReflection(reflectionPlane);

    }
    void postRenderTargetUpdate(const RenderTargetEvent& evt)
    {
        // Show plane and objects below the water
        pPlaneEnt->setVisible(true);
        std::vector<Entity*>::iterator i, iend;
        iend = belowWaterEnts.end();
        for (i = belowWaterEnts.begin(); i != iend; ++i)
        {
            (*i)->setVisible(true);
        }
        theCam->disableReflection();
    }

};

void DumpDataToOgreBuffers(Ogre::Mesh *original_mesh, Geometry::LodStripsLibrary *lodStripsLib)
{
	// Copy to Ogre buffers including the degenerated triangles

	Ogre::HardwareIndexBufferSharedPtr	ibuf;
	Ogre::IndexData	*indexes;
	Ogre::RenderOperation mRenderOp;

	for (int submesh=0; submesh < original_mesh->getNumSubMeshes(); submesh++)
	{
		int indices_to_render = lodStripsLib->GetValidIndexCount(submesh);
		int offset = lodStripsLib->GetValidOffset(submesh);

		original_mesh->getSubMesh(submesh)->_getRenderOperation(mRenderOp,0);

		ibuf = mRenderOp.indexData->indexBuffer;
		mRenderOp.indexData->indexStart = 0;
		mRenderOp.indexData->indexCount = indices_to_render;

		unsigned long* pIdx = static_cast<unsigned long*>(ibuf->lock(Ogre::HardwareBuffer::HBL_NORMAL));

		for (int k=0; k<indices_to_render; k++)
			pIdx[k] = lodStripsLib->dataRetrievalInterface->GetIndex(k+offset);

		ibuf->unlock();
	}
}

class FresnelFrameListener : public ExampleFrameListener
{
	int manage;

public:

    FresnelFrameListener(RenderWindow* win, Camera* cam)
        : ExampleFrameListener(win, cam, false, false)
    {
		manage=1;
	}

	bool frameStarted(const FrameEvent& evt)
    {
		Vector3 dist; 
		int distance=0,inc2=0,d;
		unsigned int nlod,diflods;

		// Move upto 80 units/second
		Real MoveFactor = 180.0 * evt.timeSinceLastFrame;

		// Copy the current state of the input devices
		mInputDevice->capture();

		// If this is the first frame, pick a speed
		if (evt.timeSinceLastFrame == 0)
		{
			mMoveScale = 1;
			mRotScale = 0.1;
		}
		// Otherwise scale movement units by time passed since last frame
		else
		{
			// Move about 100 units per second,
			mMoveScale = mMoveSpeed * evt.timeSinceLastFrame;
			// Take about 10 seconds for full rotation
			mRotScale = mRotateSpeed * evt.timeSinceLastFrame;
		}

		mRotX = 0;
        mRotY = 0;
	    mTranslateVector = Vector3::ZERO;

		//LOD selection
		int difdist = dist_max - dist_min;
	
		int i=0;

		dist = node->getPosition() - mCamera->getPosition(); 
		distance =dist.length();

		float lodfactor = (float)(distance - dist_min) / (float)(dist_max - dist_min);
		lodfactor = 1.0f - lodfactor;

		if (lodfactor<0.0f)
			lodfactor=0.0f;
		if (lodfactor>1.0f)
			lodfactor=1.0f;

		static float lodfactorBefore = -1.0f;
		if (fabsf(lodfactorBefore-lodfactor)>0.05f || 
			(lodfactorBefore>0.0f && lodfactor==0.0f) ||
			(lodfactorBefore<1.0f && lodfactor==1.0f))
		{
			myStrips->GoToLod(lodfactor);
			DumpDataToOgreBuffers(ogreMesh,myStrips);
			lodfactorBefore=lodfactor;
		}

		// Move the node
		if(mInputDevice->isKeyDown(Ogre::KC_UP))
		  mTranslateVector.z = -mMoveScale;


		if(mInputDevice->isKeyDown(Ogre::KC_DOWN))
		  mTranslateVector.z = mMoveScale;

		// Instead of moving the ship left and right, rotate it using yaw()
		if(mInputDevice->isKeyDown(Ogre::KC_LEFT))
		  mCamera->yaw(mRotScale);

		if(mInputDevice->isKeyDown(Ogre::KC_RIGHT))
		  mCamera->yaw(-mRotScale);

		// Move the node
		if(mInputDevice->isKeyDown(Ogre::KC_W))
		  node->translate(0,mMoveScale,0);

		if(mInputDevice->isKeyDown(Ogre::KC_S))
		  node->translate(0,-mMoveScale,0);

		if(mInputDevice->isKeyDown(Ogre::KC_Z))
		  node->scale(1.01,1.01,1.01);

		if(mInputDevice->isKeyDown(Ogre::KC_X))
		  node->scale(0.99,0.99,0.99);

		// Rotate
		if(mInputDevice->isKeyDown(Ogre::KC_A))
		  node->yaw(mRotScale);

		if(mInputDevice->isKeyDown(Ogre::KC_D))
		  node->yaw(-mRotScale);

		if(mInputDevice->isKeyDown(Ogre::KC_ESCAPE))
		{
			delete myStrips;

			delete [] mat;

		    return false;
		}

        if( mInputDevice->getMouseButton( 1 ) )
        {
            mTranslateVector.x += mInputDevice->getMouseRelativeX() * 0.13;
            mTranslateVector.y -= mInputDevice->getMouseRelativeY() * 0.13;
        }
        else
        {
            mRotX = Degree(-mInputDevice->getMouseRelativeX() * 0.13);
            mRotY = Degree(-mInputDevice->getMouseRelativeY() * 0.13);
        }


		char cadena[256];

				
		sprintf(cadena,"Distance: %d",distance);
		
		mInfo->setCaption(cadena);

		sprintf(cadena,"LOD factor: %f",lodfactor);

		mInfo2->setCaption(cadena);

		mCamera->yaw(mRotX);
        mCamera->pitch(mRotY);
        mCamera->moveRelative(mTranslateVector);

		return true;
    }
};

class FresnelApplication : public ExampleApplication
{
protected:
    RefractionTextureListener mRefractionListener;
    ReflectionTextureListener mReflectionListener;
public:
    FresnelApplication() {
    
    
    }

    ~FresnelApplication() 
    {
    }
protected:
    


    // Just override the mandatory create scene method
    void createScene(void)
    {
		Entity* pEnt;

		mat = new MaterialPtr[1];
		
	    // Check prerequisites first
		const RenderSystemCapabilities* caps = Root::getSingleton().getRenderSystem()->getCapabilities();
        if (!caps->hasCapability(RSC_VERTEX_PROGRAM) || !(caps->hasCapability(RSC_FRAGMENT_PROGRAM)))
        {
            OGRE_EXCEPT(1, "Your card does not support vertex and fragment programs, so cannot "
                "run this demo. Sorry!", 
                "Fresnel::createScene");
        }
        else
        {
            if (!GpuProgramManager::getSingleton().isSyntaxSupported("arbfp1") &&
                !GpuProgramManager::getSingleton().isSyntaxSupported("ps_2_0") &&
				!GpuProgramManager::getSingleton().isSyntaxSupported("ps_1_4")
				)
            {
                OGRE_EXCEPT(1, "Your card does not support advanced fragment programs, "
                    "so cannot run this demo. Sorry!", 
                "Fresnel::createScene");
            }
        }

        theCam = mCamera;
        theCam->setPosition(0,20,dist_min-600.0f);
        // Set ambient light
        mSceneMgr->setAmbientLight(ColourValue(0.3, 0.3, 0.3));

        // Create a point light
        Light* l = mSceneMgr->createLight("MainLight");
        l->setType(Light::LT_DIRECTIONAL);
        l->setDirection(0.0,0.0,-1.0);

       
        RenderTexture* rttTex = mRoot->getRenderSystem()->createRenderTexture( "Refraction", 512, 512 );
		
        {
            Viewport *v = rttTex->addViewport( mCamera );
            MaterialPtr mat = MaterialManager::getSingleton().getByName("Examples/FresnelReflectionRefraction");
            mat->getTechnique(0)->getPass(0)->getTextureUnitState(2)->setTextureName("Refraction");
            v->setOverlaysEnabled(false);
            rttTex->addListener(&mRefractionListener);
        }
        
		
        rttTex = mRoot->getRenderSystem()->createRenderTexture( "Reflection", 512, 512 );
        {
            Viewport *v = rttTex->addViewport( mCamera );
            MaterialPtr mat = MaterialManager::getSingleton().getByName("Examples/FresnelReflectionRefraction");
            mat->getTechnique(0)->getPass(0)->getTextureUnitState(1)->setTextureName("Reflection");
            v->setOverlaysEnabled(false);
            rttTex->addListener(&mReflectionListener);
        }
        
        
        // Define a floor plane mesh
        reflectionPlane.normal = Vector3::UNIT_Y;
        reflectionPlane.d = 0;
        MeshManager::getSingleton().createPlane("ReflectPlane",
            ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,
            reflectionPlane,
            9000,9000,10,10,true,1,5,5,Vector3::UNIT_Z);
        pPlaneEnt = mSceneMgr->createEntity( "plane", "ReflectPlane" );
        pPlaneEnt->setMaterialName("Examples/FresnelReflectionRefraction");
        mSceneMgr->getRootSceneNode()->createChildSceneNode()->attachObject(pPlaneEnt);

        
        mSceneMgr->setSkyBox(true, "Examples/CloudyNoonSkyBox");

        // My node to which all objects will be attached
        SceneNode* myRootNode = mSceneMgr->getRootSceneNode()->createChildSceneNode();


        // Now the below water ents
        pEnt = mSceneMgr->createEntity( "PoolFloor", "PoolFloor.mesh" );
        myRootNode->attachObject(pEnt);
        belowWaterEnts.push_back(pEnt);
		myRootNode->scale(6.0,6.0,6.0);

		std::string model_file=model_name;
		model_file.append(".mesh");

		//Models
        entity = mSceneMgr->createEntity(model_name, "../../../OgreStuff/media/GT/ogrolod.mesh");

		ogreMesh = entity->getMesh().getPointer();

		// load LOD info from the object
		meshloader=new Geometry::GeoMeshLoader;
		Geometry::Mesh *themesh = meshloader->load("../../../OgreStuff/media/GT/ogrolod.mesh");

        node = mSceneMgr->getRootSceneNode()->createChildSceneNode();
        node->attachObject( entity );

		std::string lod_file="../../media/GT/";
		lod_file.append(model_name);
		lod_file.append(".lod");

		if (!meshloader->GetLodStripsData())
            OGRE_EXCEPT(1, "The loaded mesh does not contain any LOD info","LOD Demo");

		myStrips = new Geometry::LodStripsLibrary(meshloader->GetLodStripsData(),themesh);
		
		entity->setNormaliseNormals(true);
		aboveWaterEnts.push_back(entity);
		entity->setMaterialName("LODStripsDemo/Ogro");

		for (int i=-3; i<7; i++) // 7
			for (int j=0; j<4; j++) // 4
			{
				char newObjName[16]="";
				sprintf(newObjName,"arbol_%d_%d",i,j);
				Ogre::SceneNode * auxnode = mSceneMgr->getRootSceneNode()->createChildSceneNode();
				Ogre::Entity *auxen = entity->clone(newObjName);
				auxnode->attachObject(auxen);
				auxnode->rotate(Ogre::Vector3(0,1,0),Ogre::Degree(180.0f),Ogre::Node::TS_WORLD);
				auxnode->scale(30.0f,30.0f,30.0f);
				float randomsepx = (float)((rand()%18)-9);
				float randomsepy = (float)((rand()%12)-6);
				auxnode->translate(i*70.0f+randomsepx,-1.0f,-j*70.0f-randomsepx);
				auxen->setNormaliseNormals(true);
			}

		node->translate(0,0,-500.0f);

        // show overlay
        Overlay* pOver = OverlayManager::getSingleton().getByName("Demo_LodStrips/Overlay");    
        mInfo = OverlayManager::getSingleton().getOverlayElement("Demo_LodStrips/Info_1");
		mInfo2 = OverlayManager::getSingleton().getOverlayElement("Demo_LodStrips/Info_2");
	    pOver->show();

    }

    void createFrameListener(void)
    {
        mFrameListener= new FresnelFrameListener(mWindow, mCamera);
        mFrameListener->showDebugOverlay(true);
        mRoot->addFrameListener(mFrameListener);
    }

};



#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
#define WIN32_LEAN_AND_MEAN
#include "windows.h"
#endif

#ifdef __cplusplus
extern "C" {
#endif

#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR strCmdLine, INT )
#else
int main(int argc, char **argv)
#endif
{
    // Create application object
    FresnelApplication app;

    try {
        app.go();
    } catch( Exception& e ) {
#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
        MessageBox( NULL, e.getFullDescription().c_str(), "An exception has occured!", MB_OK | MB_ICONERROR | MB_TASKMODAL);
#else
        std::cerr << "An exception has occured: " << e.getFullDescription();
#endif
    }


    return 0;
}

#ifdef __cplusplus
}
#endif