// ===================================================================================
// Copyright ScalFmm 2011 INRIA
// olivier.coulaud@inria.fr, berenger.bramas@inria.fr
// This software is a computer program whose purpose is to compute the FMM.
//
// This software is governed by the CeCILL-C and LGPL licenses and
// abiding by the rules of distribution of free software.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public and CeCILL-C Licenses for more details.
// "http://www.cecill.info".
// "http://www.gnu.org/licenses".
// ===================================================================================

#include "Utils/FGlobal.hpp"

#include "Containers/FOctree.hpp"
#include "Containers/FVector.hpp"

#include "Kernels/Spherical/FSphericalCell.hpp"
#include "Kernels/P2P/FP2PParticleContainerIndexed.hpp"

#include "Components/FSimpleLeaf.hpp"
#include "Kernels/Spherical/FSphericalKernel.hpp"
#include "Kernels/Spherical/FSphericalRotationKernel.hpp"
#include "Kernels/Spherical/FSphericalBlasKernel.hpp"
#include "Kernels/Spherical/FSphericalBlockBlasKernel.hpp"

#include "Files/FFmaGenericLoader.hpp"

#include "Core/FFmmAlgorithm.hpp"

#include "FUTester.hpp"

/*
  In this test we compare the spherical fmm results and the direct results.
 */

/** the test class
 *
 */
class TestSphericalDirect : public FUTester<TestSphericalDirect> {
	/** The test method to factorize all the test based on different kernels */
    template < class FReal, class CellClass, class ContainerClass, class KernelClass, class LeafClass,
	class OctreeClass, class FmmClass>
	void RunTest( const bool isBlasKernel){
		//
		const int DevP = 9;
		//
		// Load particles
		//
		if(sizeof(FReal) == sizeof(float) ) {
			std::cerr << "No input data available for Float "<< std::endl;
			exit(EXIT_FAILURE);
		}
		const std::string parFile( (sizeof(FReal) == sizeof(float))?
				"Test/DirectFloat.bfma":
				"UTest/DirectDouble.bfma");
		//
		std::string filename(SCALFMMDataPath+parFile);
		//
		FFmaGenericLoader<FReal> loader(filename);
		if(!loader.isOpen()){
			Print("Cannot open particles file.");
			uassert(false);
			return;
		}
		Print("Number of particles:");
		Print(loader.getNumberOfParticles());

		const int NbLevels      = 4;
		const int SizeSubLevels = 2;
		//
		FSize nbParticles = loader.getNumberOfParticles() ;
		FmaRWParticle<FReal, 8,8>* const particles = new FmaRWParticle<FReal, 8,8>[nbParticles];

		loader.fillParticle(particles,nbParticles);
		//
		// Create octree
		//
		FSphericalCell<FReal>::Init(DevP);
		OctreeClass tree(NbLevels, SizeSubLevels, loader.getBoxWidth(), loader.getCenterOfBox());
		//   Insert particle in the tree
		//
		for(int idxPart = 0 ; idxPart < loader.getNumberOfParticles() ; ++idxPart){
		    tree.insert(particles[idxPart].getPosition() , idxPart, particles[idxPart].getPhysicalValue() );
		}



		// Run FMM
		Print("Fmm...");
		//KernelClass kernels(NbLevels,loader.getBoxWidth());
		KernelClass kernels(DevP,NbLevels,loader.getBoxWidth(), loader.getCenterOfBox());
		FmmClass algo(&tree,&kernels);
		algo.execute();
		//
		FReal energy= 0.0 , energyD = 0.0 ;
		/////////////////////////////////////////////////////////////////////////////////////////////////
		// Compute direct energy
		/////////////////////////////////////////////////////////////////////////////////////////////////

		for(int idx = 0 ; idx <  loader.getNumberOfParticles()  ; ++idx){
		    energyD +=  particles[idx].getPotential()*particles[idx].getPhysicalValue() ;
		}
		/////////////////////////////////////////////////////////////////////////////////////////////////
		// Compare
		/////////////////////////////////////////////////////////////////////////////////////////////////
		Print("Compute Diff...");
		FMath::FAccurater<FReal> potentialDiff;
		FMath::FAccurater<FReal> fx, fy, fz;
		{ // Check that each particle has been summed with all other

			tree.forEachLeaf([&](LeafClass* leaf){
				const FReal*const potentials        = leaf->getTargets()->getPotentials();
				const FReal*const physicalValues = leaf->getTargets()->getPhysicalValues();
				const FReal*const forcesX            = leaf->getTargets()->getForcesX();
				const FReal*const forcesY            = leaf->getTargets()->getForcesY();
				const FReal*const forcesZ            = leaf->getTargets()->getForcesZ();
				const int nbParticlesInLeaf           = leaf->getTargets()->getNbParticles();
				const FVector<int>& indexes      = leaf->getTargets()->getIndexes();

				for(int idxPart = 0 ; idxPart < nbParticlesInLeaf ; ++idxPart){
					const int indexPartOrig = indexes[idxPart];
					potentialDiff.add(particles[indexPartOrig].getPotential(),potentials[idxPart]);
					fx.add(particles[indexPartOrig].getForces()[0],forcesX[idxPart]);
					fy.add(particles[indexPartOrig].getForces()[1],forcesY[idxPart]);
					fz.add(particles[indexPartOrig].getForces()[2],forcesZ[idxPart]);
					energy   += potentials[idxPart]*physicalValues[idxPart];
				}
			});
		}

		delete[] particles;

		// Print for information

		Print("Potential diff is = ");
		printf("         Pot L2Norm     %e\n",potentialDiff.getL2Norm());
		printf("         Pot RL2Norm   %e\n",potentialDiff.getRelativeL2Norm());
		printf("         Pot RMSError   %e\n",potentialDiff.getRMSError());
		Print("Fx diff is = ");
		printf("         Fx L2Norm     %e\n",fx.getL2Norm());
		printf("         Fx RL2Norm   %e\n",fx.getRelativeL2Norm());
		printf("         Fx RMSError   %e\n",fx.getRMSError());
		Print("Fy diff is = ");
		printf("        Fy L2Norm     %e\n",fy.getL2Norm());
		printf("        Fy RL2Norm   %e\n",fy.getRelativeL2Norm());
		printf("        Fy RMSError   %e\n",fy.getRMSError());
		Print("Fz diff is = ");
		printf("        Fz L2Norm     %e\n",fz.getL2Norm());
		printf("        Fz RL2Norm   %e\n",fz.getRelativeL2Norm());
		printf("        Fz RMSError   %e\n",fz.getRMSError());
		FReal L2error = (fx.getRelativeL2Norm()*fx.getRelativeL2Norm() + fy.getRelativeL2Norm()*fy.getRelativeL2Norm()  + fz.getRelativeL2Norm() *fz.getRelativeL2Norm()  );
		printf(" Total L2 Force Error= %e\n",FMath::Sqrt(L2error)) ;
		printf("  Energy Error  =   %.12e\n",FMath::Abs(energy-energyD));
		printf("  Energy FMM    =   %.12e\n",FMath::Abs(energy));
		printf("  Energy DIRECT =   %.12e\n",FMath::Abs(energyD));

		// Assert
		const FReal MaximumDiffPotential = FReal(9e-3);
		const FReal MaximumDiffForces     = FReal(9e-2);

		Print("Test1 - Error Relative L2 norm Potential ");
		uassert(potentialDiff.getRelativeL2Norm() < MaximumDiffPotential);    //1
		Print("Test2 - Error RMS L2 norm Potential ");
		uassert(potentialDiff.getRMSError() < MaximumDiffPotential);  //2
		Print("Test3 - Error Relative L2 norm FX ");
		uassert(fx.getRelativeL2Norm()  < MaximumDiffForces);                       //3
		Print("Test4 - Error RMS L2 norm FX ");
		uassert(fx.getRMSError() < MaximumDiffForces);                      //4
		Print("Test5 - Error Relative L2 norm FY ");
		uassert(fy.getRelativeL2Norm()  < MaximumDiffForces);                       //5
		Print("Test6 - Error RMS L2 norm FY ");
		uassert(fy.getRMSError() < MaximumDiffForces);                      //6
		Print("Test7 - Error Relative L2 norm FZ ");
		uassert(fz.getRelativeL2Norm()  < MaximumDiffForces);                      //8
		Print("Test8 - Error RMS L2 norm FZ ");
		uassert(fz.getRMSError() < MaximumDiffForces);                                           //8
		Print("Test9 - Error Relative L2 norm F ");
		uassert(L2error              < MaximumDiffForces);                                            //9   Total Force
		Print("Test10 - Relative error Energy ");
		uassert(FMath::Abs(energy-energyD) /energyD< MaximumDiffPotential);                     //10  Total Energy

	}

	/** If memstas is running print the memory used */
	void PostTest() {
		if( FMemStats::controler.isUsed() ){
			std::cout << "Memory used at the end " << FMemStats::controler.getCurrentAllocated() << " Bytes (" << FMemStats::controler.getCurrentAllocatedMB() << "MB)\n";
			std::cout << "Max memory used " << FMemStats::controler.getMaxAllocated() << " Bytes (" << FMemStats::controler.getMaxAllocatedMB() << "MB)\n";
			std::cout << "Total memory used " << FMemStats::controler.getTotalAllocated() << " Bytes (" << FMemStats::controler.getTotalAllocatedMB() << "MB)\n";
		}
	}

	///////////////////////////////////////////////////////////
	// The tests!
	///////////////////////////////////////////////////////////

	/** Classic */
	void TestSpherical(){
        typedef double FReal;
		typedef FSphericalCell<FReal>            CellClass;
		typedef FP2PParticleContainerIndexed<FReal>  ContainerClass;

		typedef FSphericalKernel< FReal, CellClass, ContainerClass >          KernelClass;

		typedef FSimpleLeaf<FReal, ContainerClass >                     LeafClass;
		typedef FOctree<FReal, CellClass, ContainerClass , LeafClass >  OctreeClass;

		typedef FFmmAlgorithm<OctreeClass,  CellClass, ContainerClass, KernelClass, LeafClass > FmmClass;

        RunTest<FReal, CellClass, ContainerClass, KernelClass, LeafClass,
		OctreeClass, FmmClass>(false);
	}



#ifdef ScalFMM_USE_BLAS
	/** Blas */
	void TestSphericalBlas(){
        typedef double FReal;
		typedef FSphericalCell<FReal>            CellClass;
		typedef FP2PParticleContainerIndexed<FReal>  ContainerClass;

		typedef FSphericalBlasKernel<FReal, CellClass, ContainerClass >          KernelClass;

		typedef FSimpleLeaf<FReal, ContainerClass >                     LeafClass;
		typedef FOctree<FReal, CellClass, ContainerClass , LeafClass >  OctreeClass;

		typedef FFmmAlgorithm<OctreeClass,  CellClass, ContainerClass, KernelClass, LeafClass > FmmClass;

        RunTest<FReal, CellClass, ContainerClass, KernelClass, LeafClass,
		OctreeClass, FmmClass>(true);
	}

	/** Block blas */
	void TestSphericalBlockBlas(){
        typedef double FReal;
		typedef FSphericalCell<FReal>            CellClass;
		typedef FP2PParticleContainerIndexed<FReal> ContainerClass;

		typedef FSphericalBlockBlasKernel< FReal, CellClass, ContainerClass >          KernelClass;

		typedef FSimpleLeaf<FReal, ContainerClass >                     LeafClass;
		typedef FOctree<FReal, CellClass, ContainerClass , LeafClass >  OctreeClass;

		typedef FFmmAlgorithm<OctreeClass,  CellClass, ContainerClass, KernelClass, LeafClass > FmmClass;

        RunTest<FReal, CellClass, ContainerClass, KernelClass, LeafClass,
		OctreeClass, FmmClass>(true);
	}
#endif

	///////////////////////////////////////////////////////////
	// Set the tests!
	///////////////////////////////////////////////////////////

	/** set test */
	void SetTests(){
		AddTest(&TestSphericalDirect::TestSpherical,"Test Spherical Kernel");
#ifdef ScalFMM_USE_BLAS
		AddTest(&TestSphericalDirect::TestSphericalBlas,"Test Spherical Blas Kernel");
		AddTest(&TestSphericalDirect::TestSphericalBlockBlas,"Test Spherical Block Blas Kernel");
#endif
	}
};


// You must do this
TestClass(TestSphericalDirect)