/*
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[DMRG++, Version 5.]
[by G.A., Oak Ridge National Laboratory]

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*/

/** \ingroup DMRG */
/*@{*/

/*! \file TjAncillaC.h
 *
 *  Hubbard + Heisenberg
 *
 */
#ifndef DMRG_TJ_ANCILLAC_H
#define DMRG_TJ_ANCILLAC_H
#include "../Models/FeAsModel/ModelFeBasedSc.h"
#include "../Models/TjAncillaC/ParametersTjAncillaC.h"

namespace Dmrg {
//! t-J model for DMRG solver, uses ModelHubbard and ModelHeisenberg by containment
template<typename ModelBaseType>
class TjAncillaC : public ModelBaseType {

public:

	typedef typename ModelBaseType::VectorRealType VectorRealType;
	typedef ModelFeBasedSc<ModelBaseType> ModelFeAsType;
	typedef typename ModelBaseType::ModelHelperType ModelHelperType;
	typedef typename ModelBaseType::SuperGeometryType SuperGeometryType;
	typedef typename ModelBaseType::LeftRightSuperType LeftRightSuperType;
	typedef typename ModelBaseType::LinkType LinkType;
	typedef typename ModelHelperType::OperatorsType OperatorsType;
	typedef typename OperatorsType::OperatorType OperatorType;
	typedef typename PsimagLite::Vector<OperatorType>::Type VectorOperatorType;
	typedef typename ModelHelperType::RealType RealType;
	typedef typename ModelBaseType::QnType QnType;
	typedef typename QnType::VectorQnType VectorQnType;
	typedef typename ModelHelperType::SparseMatrixType SparseMatrixType;
	typedef typename SparseMatrixType::value_type ComplexOrRealType;
	typedef	typename ModelBaseType::MyBasis BasisType;
	typedef	typename ModelBaseType::BasisWithOperatorsType MyBasisWithOperators;
	typedef typename ModelFeAsType::HilbertState HilbertStateType;
	typedef typename ModelFeAsType::HilbertBasisType HilbertBasisType;
	typedef typename ModelHelperType::BlockType BlockType;
	typedef typename ModelBaseType::SolverParamsType SolverParamsType;
	typedef typename ModelBaseType::VectorType VectorType;
	typedef typename ModelFeAsType::HilbertSpaceFeAsType HilbertSpaceType;
	typedef typename ModelBaseType::InputValidatorType InputValidatorType;
	typedef typename OperatorType::PairType PairType;
	typedef PsimagLite::Matrix<ComplexOrRealType> MatrixType;
	typedef typename PsimagLite::Vector<HilbertStateType>::Type VectorHilbertStateType;
	typedef typename PsimagLite::Vector<SizeType>::Type VectorSizeType;
	typedef typename ModelBaseType::OpsLabelType OpsLabelType;
	typedef typename ModelBaseType::OpForLinkType OpForLinkType;
	typedef typename ModelBaseType::ModelTermType ModelTermType;

	static const int NUMBER_OF_ORBITALS = 2;
	static const int FERMION_SIGN = -1;

	enum {SPIN_UP, SPIN_DOWN};

	TjAncillaC(const SolverParamsType& solverParams,
	           InputValidatorType& io,
	           const SuperGeometryType& geometry)
	    : ModelBaseType(solverParams, geometry, io),
	      modelParameters_(io),
	      superGeometry_(geometry)
	{
		if (PsimagLite::Concurrency::codeSectionParams.npthreads != 1)
			err("TjAncillaC:: cannot be run with Threads > 1 sorry\n");
	}

	void write(PsimagLite::String label1, PsimagLite::IoNg::Out::Serializer& io) const
	{
		if (!io.doesGroupExist(label1))
			io.createGroup(label1);

		PsimagLite::String label = label1 + "/" + this->params().model;
		io.createGroup(label);
		modelParameters_.write(label, io);
	}

	virtual PsimagLite::String oracle() const
	{
		const RealType ne = ModelBaseType::targetQuantum().qn(0).other[0];
		const RealType n = ModelBaseType::superGeometry().numberOfSites();
		RealType energy = -ne*(n - ne);
		return ModelBaseType::oracle(energy, "-Ne*(L-Ne)");
	}

protected:

	void fillLabeledOperators(VectorQnType& qns)
	{
		SizeType site = 0;
		BlockType block(1, site);
		VectorHilbertStateType natBasis;
		SparseMatrixType tmpMatrix;
		setBasis(natBasis, block);
		setSymmetryRelated(qns, natBasis, block.size());

		OpsLabelType& c = this->createOpsLabel("c");
		OpsLabelType& splus = this->createOpsLabel("splus");
		OpsLabelType& sz = this->createOpsLabel("sz");
		OpsLabelType& nop = this->createOpsLabel("n");
		OpsLabelType& d = this->createOpsLabel("d");
		OpsLabelType& sminus = this->createOpsLabel("sminus");

		this->makeTrackable("c");
		this->makeTrackable("splus");
		this->makeTrackable("sz");
		this->makeTrackable("n");
		this->makeTrackable("d");

		// Set the operators c^\daggger_{i\sigma} in the natural basis
		for (SizeType i=0;i<block.size();i++) {
			for (int sigma=0;sigma<2;sigma++) {
				findOperatorMatrices(tmpMatrix,i,sigma*NUMBER_OF_ORBITALS,natBasis);
				int asign= 1;
				typename OperatorType::Su2RelatedType su2related;

				OperatorType myOp(tmpMatrix,
				                  ProgramGlobals::FermionOrBosonEnum::FERMION,
				                  PairType(0, 0),
				                  asign,
				                  su2related);

				c.push(myOp);
			}

			SizeType orbital = 0;

			// Set the operators S^+_i in the natural basis
			tmpMatrix=findSplusMatrices(i,orbital,natBasis);
			typename OperatorType::Su2RelatedType su2related;
			OperatorType myOp(tmpMatrix,
			                  ProgramGlobals::FermionOrBosonEnum::BOSON,
			                  PairType(0, 0),
			                  1.0,
			                  su2related);
			splus.push(myOp);
			myOp.dagger();
			sminus.push(myOp);

			// Set the operators S^z_i in the natural basis
			tmpMatrix = findSzMatrices(i,orbital,natBasis);
			typename OperatorType::Su2RelatedType su2related2;
			OperatorType myOp2(tmpMatrix,
			                   ProgramGlobals::FermionOrBosonEnum::BOSON,
			                   PairType(0, 0),
			                   1.0,
			                   su2related2);
			sz.push(myOp2);

			// Set ni matrix:
			SparseMatrixType tmpMatrix = findNiMatrices(0,natBasis);
			RealType angularFactor= 1;
			typename OperatorType::Su2RelatedType su2related3;
			su2related3.offset = 1; //check FIXME
			OperatorType myOp3(tmpMatrix,
			                   ProgramGlobals::FermionOrBosonEnum::BOSON,
			                   PairType(0, 0),
			                   angularFactor,
			                   su2related3);
			nop.push(myOp3);

			// Set delta_i matrix:
			tmpMatrix = findDeltaIMatrices(i,natBasis);
			typename OperatorType::Su2RelatedType su2related4;
			OperatorType myOp4(tmpMatrix,
			                   ProgramGlobals::FermionOrBosonEnum::BOSON,
			                   PairType(0, 0),
			                   angularFactor,
			                   su2related4);
			d.push(myOp4);
		}

		{
			OperatorType tmp = this->naturalOperator("c", site, 0);
			tmp.dagger();
			SparseMatrixType c = tmp.getCRS();
			SparseMatrixType tmp3(multiplyTc(c,c));
			typename OperatorType::Su2RelatedType su2Related;
			this->createOpsLabel("nup").push(OperatorType(tmp3,
			                                              ProgramGlobals::FermionOrBosonEnum::BOSON,
			                                              typename OperatorType::PairType(0,0),
			                                              1.0,
			                                              su2Related));
		}

		{
			OperatorType tmp = this->naturalOperator("c", site, 1);
			tmp.dagger();
			SparseMatrixType c = tmp.getCRS();
			SparseMatrixType tmp3(multiplyTc(c,c));
			typename OperatorType::Su2RelatedType su2Related;
			this->createOpsLabel("ndown").push(OperatorType(tmp3,
			                                                ProgramGlobals::FermionOrBosonEnum::BOSON,
			                                                typename OperatorType::PairType(0,0),
			                                                1.0,
			                                                su2Related));
		}
	}

	void fillModelLinks()
	{
		//! There are orbitals*orbitals different orbitals
		//! and 2 spins. Spin is diagonal so we end up with 2*orbitals*orbitals possiblities
		//! a up a up, a up b up, b up a up, b up, b up, etc
		//! and similarly for spin down.

		const SizeType orbitals = 1; // like C2 but without hot
		const bool isSu2 = BasisType::useSu2Symmetry();
		ModelTermType& hop = ModelBaseType::createTerm("hopping");
		ModelTermType& spsm = ModelBaseType::createTerm("SplusSminus");
		ModelTermType& szsz = ModelBaseType::createTerm("szsz");
		ModelTermType& ninj = ModelBaseType::createTerm("ninj");
		ModelTermType& dd = ModelBaseType::createTerm("didj");

		for (SizeType spin = 0; spin < 2; ++spin) {
			for (SizeType orb1 = 0; orb1 < orbitals; ++orb1) {
				OpForLinkType c1("c", orb1 + spin*orbitals, orb1);
				for (SizeType orb2 = 0; orb2 < orbitals; ++orb2) {
					OpForLinkType c2("c", orb2 + spin*orbitals, orb2);

					hop.push(c1,
					         'N',
					         c2,
					         'C',
					         typename ModelTermType::Su2Properties(1,
					                                               (spin == 1) ? -1 : 1,
					                                               spin));
				}
			}

		}

		auto valueModiferTerm0 = [isSu2](ComplexOrRealType& value)
		{ value *= (isSu2) ? -0.5 : 0.5;};
		auto valueModifierTermOther = [isSu2](ComplexOrRealType& value)
		{ if (isSu2) value = -value;};

		for (SizeType orb1 = 0; orb1 < orbitals; ++orb1) {
			OpForLinkType splus1("splus", orb1, orb1);
			OpForLinkType sz1("sz", orb1, orb1);
			OpForLinkType n1("n", orb1, orb1);

			for (SizeType orb2 = 0; orb2 < orbitals; ++orb2) {
				OpForLinkType splus2("splus", orb2, orb2);
				OpForLinkType sz2("sz", orb2, orb2);
				OpForLinkType n2("n", orb2, orb2);

				spsm.push(splus1,
				          'N',
				          splus2,
				          'C',
				          valueModiferTerm0,
				          typename ModelTermType::Su2Properties(2, -1, 2));

				if (!isSu2)
					szsz.push(sz1, 'N', sz2, 'N', typename ModelTermType::Su2Properties(2, 0.5));
				else
					spsm.push(splus1,
					          'N',
					          splus2,
					          'C',
					          valueModifierTermOther,
					          typename ModelTermType::Su2Properties(2, -1, 2));

				ninj.push(n1, 'N', n2, 'N');
			}
		}

		OpForLinkType d("d");
		dd.push(d, 'N', d, 'C');
	}

private:

	//! find all states in the natural basis for a block of n sites
	void setBasis(HilbertBasisType& basis,
	              const VectorSizeType& block) const
	{
		assert(block.size()==1);
		int sitesTimesDof = 2*NUMBER_OF_ORBITALS;
		HilbertStateType total = (1<<sitesTimesDof);

		for (HilbertStateType a = 0; a < total; ++a) {
			if (!isAllowed(a)) continue;
			basis.push_back(a);
		}

		assert(basis.size() == pow(3,NUMBER_OF_ORBITALS));
	}

	bool isAllowed(HilbertStateType a) const
	{
		HilbertStateType mask1 = 1;
		mask1 <<= NUMBER_OF_ORBITALS;
		mask1--;

		HilbertStateType mask2 = mask1;
		mask2 <<= NUMBER_OF_ORBITALS;

		HilbertStateType a1 = (a & mask1);
		HilbertStateType a2 = (a & mask2);
		a2 >>= NUMBER_OF_ORBITALS;
		return ((a1 & a2) == 0);
	}

	//! Calculate fermionic sign when applying operator c^\dagger_{i\sigma} to
	//! basis state ket
	//! N.B.: HAS BEEN CHANGED TO ACCOMODATE FOR MULTIPLE BANDS
	RealType sign(const HilbertStateType& ket, int i,SizeType sigma) const
	{
		int value=0;
		SizeType dofs=2*NUMBER_OF_ORBITALS;
		for (SizeType alpha=0;alpha<dofs;alpha++)
			value += HilbertSpaceType::calcNofElectrons(ket,0,i,alpha);
		// add electron on site 0 if needed
		if (i>0) value += HilbertSpaceType::electrons(ket);

		//order for sign is: a up, a down, b up, b down, etc
		unsigned int x = HilbertSpaceType::get(ket,i);
		int spin = sigma/NUMBER_OF_ORBITALS;
		SizeType orb = sigma % NUMBER_OF_ORBITALS;

		for (SizeType j=0;j<orb;j++) {
			for (SizeType k=0;k<2;k++) {
				SizeType ind = j + k * NUMBER_OF_ORBITALS;
				int mask = (1<<ind);
				if (x & mask) value++;
			}
		}
		if (spin==SPIN_DOWN) {
			int mask = (1<<orb);
			if (x & mask) value++;
		}
		if (value==0 || value%2==0) return 1.0;

		return FERMION_SIGN;
	}

	//! Find c^\dagger_i\gamma\sigma in the natural basis natBasis
	//! N.B.: HAS BEEN CHANGED TO ACCOMODATE FOR MULTIPLE BANDS
	void findOperatorMatrices(SparseMatrixType& creationMatrix,
	                          int i,
	                          int sigma,
	                          const HilbertBasisType& natBasis) const
	{
		int n = natBasis.size();
		PsimagLite::Matrix<ComplexOrRealType> cm(n,n);
		findCreationDense(cm,i,sigma,natBasis);
		SparseMatrixType temp;
		fullMatrixToCrsMatrix(temp,cm);
		transposeConjugate(creationMatrix,temp);

	}
	//! Find c^\dagger_i\gamma\sigma in the natural basis natBasis
	//! N.B.: HAS BEEN CHANGED TO ACCOMODATE FOR MULTIPLE BANDS
	void findCreationDense(PsimagLite::Matrix<ComplexOrRealType>& cm,
	                       int i,
	                       int sigma,
	                       const HilbertBasisType& natBasis) const
	{
		HilbertStateType bra,ket;

		for (SizeType ii=0;ii<natBasis.size();ii++) {
			bra=ket=natBasis[ii];

			if (HilbertSpaceType::isNonZero(ket,i,sigma)) {

			} else {
				HilbertSpaceType::create(bra,i,sigma);
				int jj = PsimagLite::indexOrMinusOne(natBasis,bra);
				if (jj<0) continue;
				if (ii==SizeType(jj)) {
					std::cerr<<"ii="<<i<<" ket="<<ket<<" bra="<<bra;
					std::cerr<<" sigma="<<sigma<<"\n";
					throw PsimagLite::RuntimeError("Creation operator diagonal\n");
				}

				cm(ii,jj) = sign(ket,i,sigma);
			}
		}
	}

	//! Find S^+_i in the natural basis natBasis
	SparseMatrixType findSplusMatrices(int i,
	                                   SizeType orb,
	                                   const VectorHilbertStateType& natBasis) const
	{
		HilbertStateType bra,ket;
		int n = natBasis.size();
		MatrixType cm(n,n);
		SizeType sigma1 = orb + SPIN_DOWN*NUMBER_OF_ORBITALS;
		SizeType sigma2 = orb + SPIN_UP*NUMBER_OF_ORBITALS;
		for (SizeType ii=0;ii<natBasis.size();ii++) {
			bra=ket=natBasis[ii];
			if (HilbertSpaceType::isNonZero(ket,i,sigma1) &&
			        !HilbertSpaceType::isNonZero(ket,i,sigma2)) {
				// it is a down electron, then flip it:
				HilbertSpaceType::destroy(bra,i,sigma1);
				HilbertSpaceType::create(bra,i,sigma2);
				int jj = PsimagLite::indexOrMinusOne(natBasis,bra);
				assert(jj>=0);
				cm(ii,jj)=1.0;
			}
		}

		SparseMatrixType operatorMatrix(cm);
		return operatorMatrix;
	}

	//! Find S^z_i in the natural basis natBasis
	SparseMatrixType findSzMatrices(int i,
	                                SizeType orb,
	                                const VectorHilbertStateType& natBasis) const
	{
		HilbertStateType ket;
		int n = natBasis.size();
		MatrixType cm(n,n);

		for (SizeType ii=0;ii<natBasis.size();ii++) {
			ket=natBasis[ii];
			RealType value = 0.0;
			if (HilbertSpaceType::isNonZero(ket,i,orb + SPIN_UP*NUMBER_OF_ORBITALS))
				value += 1.0;
			if (HilbertSpaceType::isNonZero(ket,i,orb + SPIN_DOWN*NUMBER_OF_ORBITALS))
				value -= 1.0;

			cm(ii,ii)=0.5*value;
		}

		SparseMatrixType operatorMatrix(cm);
		return operatorMatrix;
	}

	//! Find n_i in the natural basis natBasis
	SparseMatrixType findNiMatrices(int i,
	                                const VectorHilbertStateType& natBasis) const
	{
		SizeType n = natBasis.size();
		PsimagLite::Matrix<typename SparseMatrixType::value_type> cm(n,n);

		for (SizeType ii=0;ii<natBasis.size();ii++) {
			HilbertStateType ket=natBasis[ii];
			cm(ii,ii) = 0.0;
			for (SizeType sigma=0;sigma<2;sigma++)
				if (HilbertSpaceType::isNonZero(ket,i,sigma*NUMBER_OF_ORBITALS))
					cm(ii,ii) += 1.0;
		}

		SparseMatrixType creationMatrix(cm);
		return creationMatrix;
	}

	//! Find Delta_i in the natural basis natBasis
	SparseMatrixType findDeltaIMatrices(int i,
	                                    const VectorHilbertStateType& natBasis) const
	{
		assert(NUMBER_OF_ORBITALS == 2);
		int n = natBasis.size();

		PsimagLite::Matrix<ComplexOrRealType> cru(n,n);
		findCreationDense(cru,i,SPIN_UP*NUMBER_OF_ORBITALS,natBasis);

		PsimagLite::Matrix<ComplexOrRealType> cad(n,n);
		findCreationDense(cad,i,1 + SPIN_DOWN*NUMBER_OF_ORBITALS,natBasis);

		PsimagLite::Matrix<ComplexOrRealType> crd(n,n);
		findCreationDense(crd,i,SPIN_DOWN*NUMBER_OF_ORBITALS,natBasis);

		PsimagLite::Matrix<ComplexOrRealType> cau(n,n);
		findCreationDense(cau,i,1 + SPIN_UP*NUMBER_OF_ORBITALS,natBasis);

		PsimagLite::Matrix<ComplexOrRealType> part1 = cru*cad;
		const RealType f1 = (-1.0);
		PsimagLite::Matrix<ComplexOrRealType> part2 = f1*crd*cau;

		RealType oneOverSqrt2 = 1.0/sqrt(2.0);
		PsimagLite::Matrix<ComplexOrRealType> final = oneOverSqrt2*(part1 + part2);
		SparseMatrixType temp;
		fullMatrixToCrsMatrix(temp,final);
		return temp;
	}

	void addDiagonalsInNaturalBasis(SparseMatrixType &hmatrix,
	                                const BlockType& block,
	                                RealType) const
	{
		SizeType n=block.size();

		SizeType linSize = superGeometry_.numberOfSites();
		for (SizeType i=0;i<n;i++) {
			SizeType orb = 0;
			// potentialV
			SparseMatrixType nup(this->naturalOperator("nup",i,orb).getCRS());
			SparseMatrixType ndown(this->naturalOperator("ndown",i,orb).getCRS());
			SparseMatrixType m = nup;
			SizeType index = block[i]+orb*linSize;
			assert(index<modelParameters_.potentialV.size());
			m *= modelParameters_.potentialV[block[i] + orb*linSize];
			m += modelParameters_.potentialV[index]*ndown;
			hmatrix += m;

		}
	}

	void setSymmetryRelated(VectorQnType& qns,
	                        const HilbertBasisType& basis,
	                        int n) const
	{
		assert(n==1);

		// find j,m and flavors (do it by hand since we assume n==1)
		// note: we use 2j instead of j
		// note: we use m+j instead of m
		// This assures us that both j and m are SizeType
		typedef std::pair<SizeType,SizeType> PairType;

		SizeType basisSize = basis.size();
		VectorSizeType other(3, 0);
		qns.resize(basisSize, QnType::zero());
		for (SizeType i = 0; i < basisSize; ++i) {
			PairType jmpair = calcJmvalue<PairType>(basis[i]);

			// nup
			other[1] = HilbertSpaceType::electronsWithGivenSpin(basis[i],SPIN_UP);
			// ndown
			SizeType ndown = HilbertSpaceType::electronsWithGivenSpin(basis[i],SPIN_DOWN);

			other[2] =  HilbertSpaceType::calcNofElectrons(basis[i], 0);
			other[2] += HilbertSpaceType::calcNofElectrons(basis[i],NUMBER_OF_ORBITALS);
			other[0] = other[1] + ndown;
			bool sign = other[0] & 1;
			qns[i] = QnType(sign, other, jmpair, other[0]);
		}
	}

	// note: we use 2j instead of j
	// note: we use m+j instead of m
	// This assures us that both j and m are SizeType
	// Reinterprets 6 and 9
	template<typename PairType>
	PairType calcJmvalue(const HilbertStateType&) const
	{
		return PairType(0,0);
	}

	ParametersTjAncillaC<RealType, QnType>  modelParameters_;
	const SuperGeometryType& superGeometry_;
};	//class TjAncillaC

} // namespace Dmrg
/*@}*/
#endif // DMRG_TJ_ANCILLAC_H

