/** \file elbeem/intern/simulation_object.cpp
 *  \ingroup elbeem
 */
/******************************************************************************
 *
 * El'Beem - Free Surface Fluid Simulation with the Lattice Boltzmann Method
 * Copyright 2003-2006 Nils Thuerey
 *
 * Basic interface for all simulation modules
 *
 *****************************************************************************/

#include "simulation_object.h"
#include "solver_interface.h"
#include "ntl_bsptree.h"
#include "ntl_ray.h"
#include "ntl_world.h"
#include "solver_interface.h"
#include "particletracer.h"
#include "elbeem.h"

#if PARALLEL==1
#include <omp.h>
#endif

#ifdef _WIN32
#else
#include <sys/time.h>
#endif


//! lbm factory functions
LbmSolverInterface* createSolver();

#if PARALLEL==1
static int omp_threadcache;
#endif

/******************************************************************************
 * Constructor
 *****************************************************************************/
SimulationObject::SimulationObject() :
	ntlGeometryShader(),
	mGeoStart(-100.0), mGeoEnd(100.0),
	mpGiTree(NULL), mpGiObjects(NULL),
	mpGlob(NULL),
	mPanic( false ),
	mDebugType( 1 /* =FLUIDDISPNothing*/ ),
	mpLbm(NULL), mpParam( NULL ),
	mShowSurface(true), mShowParticles(false),
	mSelectedCid( NULL ),
	mpElbeemSettings( NULL )

{
	mpParam = new Parametrizer();
	//for(int i=0; i<MAX_DEBDISPSET; i++) { mDebDispSet[i].type  = (i); mDebDispSet[i].on    = false; mDebDispSet[i].scale = 1.0; }

	// reset time
	mTime 						= 0.0;
}


/******************************************************************************
 * Destructor
 *****************************************************************************/
SimulationObject::~SimulationObject()
{
	if(mpGiTree)         delete mpGiTree;
	if(mpElbeemSettings) delete mpElbeemSettings;
	if(mpLbm)            delete mpLbm;
  	if(mpParam)          delete mpParam;
	if(mpParts)          delete mpParts;
	debMsgStd("SimulationObject",DM_MSG,"El'Beem Done!\n",10);
#if (PARALLEL == 1)
	omp_set_num_threads(omp_threadcache);
	printf("Resetting omp_threads to cached value %d \n", omp_threadcache);
#endif
}



/*****************************************************************************/
/*! init tree for certain geometry init */
/*****************************************************************************/
void SimulationObject::initGeoTree() {
	// unused!! overriden by solver interface	
	if(mpGlob == NULL) { 
		errFatal("SimulationObject::initGeoTree error","Requires globals!", SIMWORLD_INITERROR); 
		return;
	}
	ntlScene *scene = mpGlob->getSimScene();
	mpGiObjects = scene->getObjects();

	if(mpGiTree != NULL) delete mpGiTree;
	char treeFlag = (1<<(mGeoInitId+4));
	mpGiTree = new ntlTree( 20, 4, // warning - fixed values for depth & maxtriangles here...
												scene, treeFlag );
	// unused!! overriden by solver interface	
}

/*****************************************************************************/
/*! destroy tree etc. when geometry init done */
/*****************************************************************************/
void SimulationObject::freeGeoTree() {
	if(mpGiTree != NULL) delete mpGiTree;
}



// copy & remember settings for later use
void SimulationObject::copyElbeemSettings(elbeemSimulationSettings *settings) {
	mpElbeemSettings = new elbeemSimulationSettings;
	*mpElbeemSettings = *settings;

	mGeoInitId = settings->domainId+1;
	debMsgStd("SimulationObject",DM_MSG,"mGeoInitId="<<mGeoInitId<<", domainId="<<settings->domainId, 8);
}

/******************************************************************************
 * simluation interface: initialize simulation using the given configuration file 
 *****************************************************************************/
extern int glob_mpnum;
int SimulationObject::initializeLbmSimulation(ntlRenderGlobals *glob)
{
	if(! isSimworldOk() ) return 1;
	
	// already inited?
	if(mpLbm) return 0;
	
	mpGlob = glob;
	if(!getVisible()) {
		mpAttrs->setAllUsed();
		return 0;
	}


	mGeoInitId = mpAttrs->readInt("geoinitid", mGeoInitId,"LbmSolverInterface", "mGeoInitId", false);
	//mDimension, mSolverType are deprecated
	string mSolverType(""); 
	mSolverType = mpAttrs->readString("solver", mSolverType, "SimulationObject","mSolverType", false ); 

	mpLbm = createSolver(); 
  /* check lbm pointer */
	if(mpLbm == NULL) {
		errFatal("SimulationObject::initializeLbmSimulation","Unable to init LBM solver! ", SIMWORLD_INITERROR);
		return 2;
	}
	debMsgStd("SimulationObject::initialized",DM_MSG,"IdStr:"<<mpLbm->getIdString() <<" LBM solver! ", 2);

	mpParts = new ParticleTracer();

	// for non-param simulations
	mpLbm->setParametrizer( mpParam );
	mpParam->setAttrList( getAttributeList() );
	// not needed.. done in solver_init: mpParam->setSize ... in solver_interface
	mpParam->parseAttrList();

	mpLbm->setAttrList( getAttributeList() );
	mpLbm->setSwsAttrList( getSwsAttributeList() );
	mpLbm->parseAttrList();
	mpParts->parseAttrList( getAttributeList() );

	if(! isSimworldOk() ) return 3;
	mpParts->setName( getName() + "_part" );
	mpParts->initialize( glob );
	if(! isSimworldOk() ) return 4;
	
	// init material settings
	string matMc("default");
	matMc = mpAttrs->readString("material_surf", matMc, "SimulationObject","matMc", false );
	mShowSurface   = mpAttrs->readInt("showsurface", mShowSurface, "SimulationObject","mShowSurface", false ); 
	mShowParticles = mpAttrs->readInt("showparticles", mShowParticles, "SimulationObject","mShowParticles", false ); 

	checkBoundingBox( mGeoStart, mGeoEnd, "SimulationObject::initializeSimulation" );
	mpLbm->setLbmInitId( mGeoInitId );
	mpLbm->setGeoStart( mGeoStart );
	mpLbm->setGeoEnd( mGeoEnd );
	mpLbm->setRenderGlobals( mpGlob );
	mpLbm->setName( getName() + "_lbm" );
	mpLbm->setParticleTracer( mpParts );
	if(mpElbeemSettings) {
		// set further settings from API struct init
		if(mpElbeemSettings->outputPath) this->mOutFilename = string(mpElbeemSettings->outputPath);
		mpLbm->initDomainTrafo( mpElbeemSettings->surfaceTrafo );
		mpLbm->setSmoothing(1.0 * mpElbeemSettings->surfaceSmoothing, 1.0 * mpElbeemSettings->surfaceSmoothing);
		mpLbm->setIsoSubdivs(mpElbeemSettings->surfaceSubdivs);
#if PARALLEL==1
		omp_threadcache = omp_get_max_threads();
		omp_set_num_threads(mpElbeemSettings->threads);
		printf("Setting omp_threads to usersetting %d \n", mpElbeemSettings->threads);
#endif
		mpLbm->setSizeX(mpElbeemSettings->resolutionxyz);
		mpLbm->setSizeY(mpElbeemSettings->resolutionxyz);
		mpLbm->setSizeZ(mpElbeemSettings->resolutionxyz);
		mpLbm->setPreviewSize(mpElbeemSettings->previewresxyz);
		mpLbm->setRefinementDesired(mpElbeemSettings->maxRefine);
		mpLbm->setGenerateParticles(mpElbeemSettings->generateParticles);
		// set initial particles
		mpParts->setNumInitialParticles(mpElbeemSettings->numTracerParticles);
		
		// surface generation flag
		mpLbm->setSurfGenSettings(mpElbeemSettings->mFsSurfGenSetting);

		string dinitType = string("no");
		if     (mpElbeemSettings->domainobsType==FLUIDSIM_OBSTACLE_PARTSLIP) dinitType = string("part"); 
		else if(mpElbeemSettings->domainobsType==FLUIDSIM_OBSTACLE_FREESLIP) dinitType = string("free"); 
		else /*if(mpElbeemSettings->domainobsType==FLUIDSIM_OBSTACLE_NOSLIP)*/ dinitType = string("no"); 
		mpLbm->setDomainBound(dinitType);
		mpLbm->setDomainPartSlip(mpElbeemSettings->domainobsPartslip);
		mpLbm->setDumpVelocities(mpElbeemSettings->generateVertexVectors);
		mpLbm->setFarFieldSize(mpElbeemSettings->farFieldSize);
		debMsgStd("SimulationObject::initialize",DM_MSG,"Added domain bound: "<<dinitType<<" ps="<<mpElbeemSettings->domainobsPartslip<<" vv"<<mpElbeemSettings->generateVertexVectors<<","<<mpLbm->getDumpVelocities(), 9 );

		debMsgStd("SimulationObject::initialize",DM_MSG,"Set ElbeemSettings values "<<mpLbm->getGenerateParticles(),10);
	}

	if(! mpLbm->initializeSolverMemory()   )         { errMsg("SimulationObject::initialize","initializeSolverMemory failed"); mPanic=true; return 10; }
	if(checkCallerStatus(FLUIDSIM_CBSTATUS_STEP, 0)) { errMsg("SimulationObject::initialize","initializeSolverMemory status"); mPanic=true; return 11; } 
	if(! mpLbm->initializeSolverGrids()    )         { errMsg("SimulationObject::initialize","initializeSolverGrids  failed"); mPanic=true; return 12; }
	if(checkCallerStatus(FLUIDSIM_CBSTATUS_STEP, 0)) { errMsg("SimulationObject::initialize","initializeSolverGrids  status"); mPanic=true; return 13; } 
	if(! mpLbm->initializeSolverPostinit() )         { errMsg("SimulationObject::initialize","initializeSolverPostin failed"); mPanic=true; return 14; }
	if(checkCallerStatus(FLUIDSIM_CBSTATUS_STEP, 0)) { errMsg("SimulationObject::initialize","initializeSolverPostin status"); mPanic=true; return 15; } 

	// print cell type stats
	bool printStats = true;
	if(glob_mpnum>0) printStats=false; // skip in this case
	if(printStats) {
		const int jmax = sizeof(CellFlagType)*8;
		int totalCells = 0;
		int flagCount[jmax];
		for(int j=0; j<jmax ; j++) flagCount[j] = 0;
		int diffInits = 0;
		LbmSolverInterface::CellIdentifier cid = mpLbm->getFirstCell();
		for(; mpLbm->noEndCell( cid );
					mpLbm->advanceCell( cid ) ) {
			int flag = mpLbm->getCellFlag(cid,0);
			int flag2 = mpLbm->getCellFlag(cid,1);
			if(flag != flag2) {
				diffInits++;
			}
			for(int j=0; j<jmax ; j++) {
				if( flag&(1<<j) ) flagCount[j]++;
			}
			totalCells++;
		}
		mpLbm->deleteCellIterator( &cid );

		char charNl = '\n';
		debugOutNnl("SimulationObject::initializeLbmSimulation celltype stats: " <<charNl, 5);
		debugOutNnl("no. of cells = "<<totalCells<<", "<<charNl ,5);
		for(int j=0; j<jmax ; j++) {
			std::ostringstream out;
			if(flagCount[j]>0) {
				out<<"\t" << flagCount[j] <<" x "<< convertCellFlagType2String( (CellFlagType)(1<<j) ) <<", " << charNl;
				debugOutNnl(out.str(), 5);
			}
		}
		// compute dist. of empty/bnd - fluid - if
		// cfEmpty   = (1<<0), cfBnd  = (1<< 2), cfFluid   = (1<<10), cfInter   = (1<<11),
		if(1){
			std::ostringstream out;
			out.precision(2); out.width(4);
			int totNum = flagCount[1]+flagCount[2]+flagCount[7]+flagCount[8];
			double ebFrac = (double)(flagCount[1]+flagCount[2]) / totNum;
			double flFrac = (double)(flagCount[7]) / totNum;
			double ifFrac = (double)(flagCount[8]) / totNum;
			//???
			out<<"\tFractions: [empty/bnd - fluid - interface - ext. if]  =  [" << ebFrac<<" - " << flFrac<<" - " << ifFrac<<"] "<< charNl;

			if(diffInits > 0) {
				debMsgStd("SimulationObject::initializeLbmSimulation",DM_MSG,"celltype Warning: Diffinits="<<diffInits<<"!" , 5);
			}
			debugOutNnl(out.str(), 5);
		}
	} // cellstats

	// might be modified by mpLbm
	//mpParts->setStart( mGeoStart );?  mpParts->setEnd( mGeoEnd );?
	mpParts->setStart( mpLbm->getGeoStart() );
	mpParts->setEnd(   mpLbm->getGeoEnd()   );
	mpParts->setCastShadows( false );
	mpParts->setReceiveShadows( false );
	mpParts->searchMaterial( glob->getMaterials() );

	// this has to be inited here - before, the values might be unknown
	IsoSurface *surf = mpLbm->getSurfaceGeoObj();
	if(surf) {
		surf->setName( "final" ); // final surface mesh 
		// warning - this might cause overwriting effects for multiple sims and geom dump...
		surf->setCastShadows( true );
		surf->setReceiveShadows( false );
		surf->searchMaterial( glob->getMaterials() );
		if(mShowSurface) mObjects.push_back( surf );
	}
	
#ifdef ELBEEM_PLUGIN
	mShowParticles=1; // for e.g. dumping
#endif // ELBEEM_PLUGIN
	if((mpLbm->getGenerateParticles()>0.0)||(mpParts->getNumInitialParticles()>0)) {
		mShowParticles=1;
		mpParts->setDumpParts(true);
	}
		//debMsgStd("SimulationObject::init",DM_NOTIFY,"Using envvar ELBEEM_DUMPPARTICLE to set mShowParticles, DEBUG!",1);
	//}  // DEBUG ENABLE!!!!!!!!!!
	if(mShowParticles) {
		mObjects.push_back(mpParts);
	}

	// add objects to display for debugging (e.g. levelset particles)
	vector<ntlGeometryObject *> debugObjs = mpLbm->getDebugObjects();
	for(size_t i=0;i<debugObjs.size(); i++) {
		debugObjs[i]->setCastShadows( false );
		debugObjs[i]->setReceiveShadows( false );
		debugObjs[i]->searchMaterial( glob->getMaterials() );
		mObjects.push_back( debugObjs[i] );
		debMsgStd("SimulationObject::init",DM_NOTIFY,"Added debug obj "<<debugObjs[i]->getName(), 10 );
	}
	return 0;
}

/*! set current frame */
void SimulationObject::setFrameNum(int num) {
	// advance parametrizer
	mpParam->setFrameNum(num);
}

/******************************************************************************
 * simluation interface: advance simulation another step (whatever delta time that might be) 
 *****************************************************************************/
void SimulationObject::step( void )
{
	if(mpParam->getCurrentAniFrameTime()>0.0) {
		// dont advance for stopped time
		mpLbm->step();
		mTime += mpParam->getTimestep();
		//if(mTime>0.001) { errMsg("DEBUG!!!!!!!!","quit mlsu..."); xit(1); } // PROFILE DEBUG TEST!
	}
	if(mpLbm->getPanic()) mPanic = true;

	checkCallerStatus(FLUIDSIM_CBSTATUS_STEP, 0);
	//if((mpElbeemSettings)&&(mpElbeemSettings->runsimCallback)) {
		//int ret = (mpElbeemSettings->runsimCallback)(mpElbeemSettings->runsimUserData, FLUIDSIM_CBSTATUS_STEP, 0);
		//errMsg("runSimulationCallback cbtest1"," "<<this->getName()<<" ret="<<ret);
	//}
  //debMsgStd("SimulationObject::step",DM_MSG," Sim '"<<mName<<"' stepped to "<<mTime<<" (stept="<<(mpParam->getTimestep())<<", framet="<<getFrameTime()<<") ", 10);
}
/*! prepare visualization of simulation for e.g. raytracing */
void SimulationObject::prepareVisualization( void ) {
	if(mPanic) return;
	mpLbm->prepareVisualization();
}


/******************************************************************************/
/* get current start simulation time */
double SimulationObject::getStartTime( void ) {
	//return mpParam->calculateAniStart();
	return mpParam->getAniStart();
}
/* get time for a single animation frame */
double SimulationObject::getFrameTime( int frame ) {
	return mpParam->getAniFrameTime(frame);
}
/* get time for a single time step  */
double SimulationObject::getTimestep( void ) {
	return mpParam->getTimestep();
}


/******************************************************************************
 * return a pointer to the geometry object of this simulation 
 *****************************************************************************/
//ntlGeometryObject *SimulationObject::getGeometry() { return mpMC; }
vector<ntlGeometryObject *>::iterator 
SimulationObject::getObjectsBegin()
{
	return mObjects.begin();
}
vector<ntlGeometryObject *>::iterator 
SimulationObject::getObjectsEnd()
{
	return mObjects.end();
}





/******************************************************************************
 * GUI - display debug info 
 *****************************************************************************/

void SimulationObject::drawDebugDisplay() {
#ifndef NOGUI
	if(!getVisible()) return;

	//if( mDebugType > (MAX_DEBDISPSET-1) ){ errFatal("SimulationObject::drawDebugDisplay","Invalid debug type!", SIMWORLD_GENERICERROR); return; }
	//mDebDispSet[ mDebugType ].on = true;
	//errorOut( mDebugType <<"//"<< mDebDispSet[mDebugType].type );
	mpLbm->debugDisplay( mDebugType );

	//::lbmMarkedCellDisplay<>( mpLbm );
	mpLbm->lbmMarkedCellDisplay();
#endif
}

/* GUI - display interactive info  */
void SimulationObject::drawInteractiveDisplay()
{
#ifndef NOGUI
	if(!getVisible()) return;
	if(mSelectedCid) {
		// in debugDisplayNode if dispset is on is ignored...
		mpLbm->debugDisplayNode( FLUIDDISPGrid, mSelectedCid );
	}
#endif
}


/*******************************************************************************/
// GUI - handle mouse movement for selection 
/*******************************************************************************/
void SimulationObject::setMousePos(int x,int y, ntlVec3Gfx org, ntlVec3Gfx dir)
{
	normalize( dir );
	// assume 2D sim is in XY plane...
	
	double zplane = (mGeoEnd[2]-mGeoStart[2])*0.5;
	double zt = (zplane-org[2]) / dir[2];
	ntlVec3Gfx pos(
			org[0]+ dir[0] * zt,
			org[1]+ dir[1] * zt, 0.0);

	mSelectedCid = mpLbm->getCellAt( pos );
	//errMsg("SMP ", mName<< x<<" "<<y<<" - "<<dir );
	x = y = 0; // remove warning
}
			

void SimulationObject::setMouseClick()
{
	if(mSelectedCid) {
		//::debugPrintNodeInfo<>( mpLbm, mSelectedCid, mpLbm->getNodeInfoString() );
		mpLbm->debugPrintNodeInfo( mSelectedCid );
	}
}

/*! notify object that dump is in progress (e.g. for field dump) */
void SimulationObject::notifyShaderOfDump(int dumptype, int frameNr,char *frameNrStr,string outfilename) {
	if(!mpLbm) return;

	mpLbm->notifySolverOfDump(dumptype, frameNr,frameNrStr,outfilename);
	checkCallerStatus(FLUIDSIM_CBSTATUS_NEWFRAME, frameNr);
}

/*! check status (e.g. stop/abort) from calling program, returns !=0 if sth. happened... */
int SimulationObject::checkCallerStatus(int status, int frame) {
	//return 0; // DEBUG
	int ret = 0;
	if((mpElbeemSettings)&&(mpElbeemSettings->runsimCallback)) {
		ret = (mpElbeemSettings->runsimCallback)(mpElbeemSettings->runsimUserData, status,frame);
		if(ret!=FLUIDSIM_CBRET_CONTINUE) {
			if(ret==FLUIDSIM_CBRET_STOP) {
				debMsgStd("SimulationObject::notifySolverOfDump",DM_NOTIFY,"Got stop signal from caller",1);
				setElbeemState( SIMWORLD_STOP );
			}
			else if(ret==FLUIDSIM_CBRET_ABORT) {
				errFatal("SimulationObject::notifySolverOfDump","Got abort signal from caller, aborting...", SIMWORLD_GENERICERROR );
				mPanic = 1;
			}
			else {
				errMsg("SimulationObject::notifySolverOfDump","Invalid callback return value: "<<ret<<", ignoring... ");
			}
		}
	}

	//debMsgStd("SimulationObject::checkCallerStatus",DM_MSG, "s="<<status<<",f="<<frame<<" "<<this->getName()<<" ret="<<ret);
	if(isSimworldOk()) return 0;
	return 1;
}