/* -*- c++ -*- (enables emacs c++ mode) */
/*===========================================================================
 
 Copyright (C) 2002-2012 Michel Fournié, Julien Pommier,
 
 This file is a part of GETFEM++
 
 Getfem++  is  free software;  you  can  redistribute  it  and/or modify it
 under  the  terms  of the  GNU  Lesser General Public License as published
 by  the  Free Software Foundation;  either version 3 of the License,  or
 (at your option) any later version along with the GCC Runtime Library
 Exception either version 3.1 or (at your option) any later version.
 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 Lesser General Public
 License and GCC Runtime Library Exception for more details.
 You  should  have received a copy of the GNU Lesser General Public License
 along  with  this program;  if not, write to the Free Software Foundation,
 Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
 
 As a special exception, you  may use  this file  as it is a part of a free
 software  library  without  restriction.  Specifically,  if   other  files
 instantiate  templates  or  use macros or inline functions from this file,
 or  you compile this  file  and  link  it  with other files  to produce an
 executable, this file  does  not  by itself cause the resulting executable
 to be covered  by the GNU Lesser General Public License.  This   exception
 does not  however  invalidate  any  other  reasons why the executable file
 might be covered by the GNU Lesser General Public License.
 
===========================================================================*/
#ifndef NAVIER_STOKES_H_
#define NAVIER_STOKES_H_

#include "getfem/getfem_assembling.h" /* import assembly methods (and norms comp.) */
#include "getfem/getfem_export.h"   /* export functions (save solution in a file)  */
#include "getfem/getfem_regular_meshes.h"
#include "getfem/getfem_modeling.h"
#include "gmm/gmm.h"

using std::endl; using std::cout; using std::cerr;
using std::ends; using std::cin;

namespace getfem {


	/*
	 * Adams-Bashfort - For explict treatment
	 */
	
	template<typename VEC1, typename VEC>
	void asm_NS_uuT_Explicite(const VEC1 &V, const mesh_im &mim,
					const mesh_fem &mf, const VEC &U0,
					const mesh_region &rg = mesh_region::all_convexes()) {
		generic_assembly assem;    
		assem.set("u=data(#1); "
				  "t = comp(vBase(#1).vBase(#1).vGrad(#1));"
				  "V(#1)+=u(l).u(i).t(i,k,:,j,l,j,k)"
				   );
		assem.push_mi(mim);
		assem.push_mf(mf);
		assem.push_data(U0);
		assem.push_vec(V);
		assem.assembly(rg);
	}
	
	
	
  /*
   * div(uuT) term. 
   */
  
  template<typename MAT, typename VEC>
  void asm_NS_uuT(const MAT &M, const mesh_im &mim,
		  const mesh_fem &mf, const VEC &U0,
		  const mesh_region &rg = mesh_region::all_convexes()) {
    generic_assembly assem;    
    assem.set("u=data(#1); "
	      "t = comp(vBase(#1).vBase(#1).vGrad(#1));"
	      "M(#1, #1)+=u(i).t(i,k,:,j,:,j,k)"
	      // ";M(#1, #1)+=u(i).t(i,k,:,k,:,j,j)" // optional (or *0.5)
	      );
    assem.push_mi(mim);
    assem.push_mf(mf);
    assem.push_data(U0);
    assem.push_mat(const_cast<MAT&>(M));
    assem.assembly(rg);
  }

  /*
   * Boundary term for the pressure 
   */
  
  template<typename MAT>
  void asm_B_boundary(const MAT &M, const mesh_im &mim,
		      const mesh_fem &mfu, const mesh_fem &mfp,
		      const mesh_region &rg) {
    generic_assembly assem;    
    assem.set("M$1(#2, #1)+=-comp(Base(#2).vBase(#1).Normal())(:,:,i,i);");
    assem.push_mi(mim);
    assem.push_mf(mfu);
    assem.push_mf(mfp);
    assem.push_mat(const_cast<MAT&>(M));
    assem.assembly(rg);
  }



 //template<typename VEC, typename VECTOR>
// void traineePortance2D(VEC &Cd, VEC &Cl, const mesh_im &mim,
//			const mesh_fem &mf, const VECTOR &lambda,
//			const mesh_region &rg) {
//
//   generic_assembly assem;
//   assem.set("l=data$1(#1); V$1()+=comp(vBase(#1).Normal())(i,1,1).l(i);V$2()+=comp(vBase(#1).Normal())(i,1,2).l(i);");
//   
//   assem.push_mi(mim);
//   
//   assem.push_mf(mf);
//   assem.push_data(lambda);
//
//   assem.push_vec(Cd);
//   assem.push_vec(Cl);
//
//   assem.assembly(rg); //region = bord du cylindre
//						 
// }

	
	
	template<typename VEC, typename VECTOR>
	void ClCd2D(VEC &Cxn, VEC &Cxp,VEC &Cyn, VEC &Cyp, const mesh_im &mim,
						   const mesh_fem &mf1,const mesh_fem &mf2, const VECTOR &U0,const VECTOR &P0, const mesh_region &rg) {
		
		generic_assembly assem;
		
		assem.set("u=data$1(#1); p=data$2(#2);"
				  "t1=comp(vGrad(#1).Normal());"
				  "V$1()+=2*t1(i,1,1,1).u(i) + t1(i,1,2,2).u(i) + t1(i,2,1,2).u(i);"
				  "t2=comp(Base(#2).Normal());"
				  "V$2()+=-1*t2(i,1).p(i);"
				  "t3=comp(vGrad(#1).Normal());"
				  "V$3()+=2*t3(i,2,2,2).u(i) + t3(i,1,2,1).u(i) + t3(i,2,1,1).u(i);"
				  "t4=comp(Base(#2).Normal());"
				  "V$4()+=-1*t4(i,2).p(i);");
		
		
		//assem.set("nuDxU=data$1(#1); nuDyU=data$2(#1); nuDxV=data$3(#1); nuDyV=data$4(#1); p=data$5(#2);"
		//		  "t1=comp(vBase(#1).Normal());"
		//		  "V$1()+=2*t1(i,1,1).nuDxU(i) + t1(i,1,2).nuDyU(i) + t1(i,1,2).nuDxV(i);"
		//		  "t2=comp(Base(#2).Normal());"
		//		  "V$2()+=-1*t2(i,1).p(i);"
		//		  "t3=comp(vBase(#1).Normal());"
		//		  "V$3()+=2*t3(i,1,2).nuDyV(i) + t3(i,1,1).nuDyU(i) + t3(i,1,1).nuDxV(i);"
		//		  "t4=comp(Base(#2).Normal());"
		//		  "V$4()+=-1*t4(i,2).p(i);");
		
		
		assem.push_mi(mim);
		assem.push_mf(mf1);
		assem.push_mf(mf2);

		assem.push_data(U0);
		assem.push_data(P0);
		
		assem.push_vec(Cxn); 
		assem.push_vec(Cxp);
		assem.push_vec(Cyn); 
		assem.push_vec(Cyp);
		
		assem.assembly(rg); //region = bord du cylindre
		
	}
		

 template<typename VEC, typename VECTOR>
 void ClCd3D(VEC &Cxn, VEC &Cxp,VEC &Cyn, VEC &Cyp, const mesh_im &mim,
			const mesh_fem &mf1, const mesh_fem &mf2,const VECTOR &U0, 
			const VECTOR &P0, const mesh_region &rg) {

   generic_assembly assem;

	assem.set("u=data$1(#1); p=data$2(#2);"
			  "t1=comp(vGrad(#1).Normal());"
			  "V$1()+=2*t1(i,1,1,1).u(i) + t1(i,1,2,2).u(i) + t1(i,2,1,2).u(i) + t1(i,3,1,3).u(i) + t1(i,1,3,3).u(i);"
			  "t2=comp(Base(#2).Normal());"
			  "V$2()+=-1*t2(i,1).p(i);"
			  "t3=comp(vGrad(#1).Normal());"
			  "V$3()+=2*t3(i,2,2,2).u(i) + t3(i,1,2,1).u(i) + t3(i,2,1,1).u(i) + t3(i,3,2,3).u(i) + t3(i,2,3,3).u(i);"
			  "t4=comp(Base(#2).Normal());"
			  "V$4()+=-1*t4(i,2).p(i);");
	 
   assem.push_mi(mim);

   assem.push_mf(mf1);
   assem.push_mf(mf2);

   assem.push_data(U0);   
   assem.push_data(P0);
   
   assem.push_vec(Cxn); 
   assem.push_vec(Cxp);
   assem.push_vec(Cyn); 
   assem.push_vec(Cyp);
  
   assem.assembly(rg); //region = bord du cylindre
						 
 }


  template<typename MODEL_STATE = standard_model_state>
  class mdbrick_NS_uuT : public mdbrick_abstract<MODEL_STATE> {

    TYPEDEF_MODEL_STATE_TYPES;
    
    mdbrick_abstract<MODEL_STATE> &sub_problem;
    VECTOR U0;
    size_type num_fem, i1, nbd;
    T_MATRIX K;

    virtual void proper_update(void) {}

  public :

    virtual void do_compute_tangent_matrix(MODEL_STATE &MS, size_type i0,
					size_type) {
      const mesh_fem &mf_u = *(this->mesh_fems[num_fem]);
      gmm::sub_interval SUBI(i0+this->mesh_fem_positions[num_fem],
			     mf_u.nb_dof());
      gmm::resize(K, mf_u.nb_dof(), mf_u.nb_dof());
      gmm::clear(K);
      asm_NS_uuT(K, *(this->mesh_ims[0]), mf_u, U0, 
		 mf_u.linked_mesh().get_mpi_region());
      gmm::add(K, gmm::sub_matrix(MS.tangent_matrix(), SUBI));
    }
    virtual void do_compute_residual(MODEL_STATE &MS, size_type i0,
				size_type) {
      const mesh_fem &mf_u = *(this->mesh_fems[num_fem]);
      gmm::sub_interval SUBI(i0+this->mesh_fem_positions[num_fem],
			     mf_u.nb_dof());
      typename gmm::sub_vector_type<VECTOR *, gmm::sub_interval>::vector_type
	SUBV = gmm::sub_vector(MS.residual(), SUBI);
      gmm::mult_add(K, gmm::sub_vector(MS.state(), SUBI), SUBV);
    }

    template <class VEC> void set_U0(const VEC &q) {
      gmm::resize(U0, gmm::vect_size(q));
      gmm::copy(q, U0);
    }

    void init_(void) {
      this->add_sub_brick(sub_problem);
      this->proper_is_coercive_ = false;
      this->proper_is_symmetric_ = false;
      this->force_update();
    }

    // Constructor which homogeneous diagonal Q
    mdbrick_NS_uuT(mdbrick_abstract<MODEL_STATE> &problem,
		   size_type num_fem_=0) 
      : sub_problem(problem), num_fem(num_fem_) { init_(); }

  };



  /* ******************************************************************** */
  /*		A non-reflective condition.                               */
  /* ******************************************************************** */
  // idée: construire la condition non-réflective comme une condition de dirichlet en explicitant tous les termes: Unp1= Un+dt*Un.N*lamda




// initialisation des CL
// résolution du pb -> nouveau lambda<--| 
//mise à jour de CL de sortie        -->|  



# define MDBRICK_NS_NONREF1 3212435

 template<typename VECTOR, typename VECT>
  void asm_nonref_right_hand_side(VECTOR &R,
				  const mesh_im &mim,
				  const mesh_fem &mf_u,
				  const mesh_fem &mf_mult,
				  const VECT &Un,
				  const mesh_region &rg) {
    generic_assembly assem;
    // construction du terme de droite dans [M]*Unp1=F
    
    // mise en place de Un.N + Un.N*(dUn/dn).N

    std::stringstream ss;
    ss << "u=data$1(#1); "
     "V(#1)+=comp(vBase(#1).vBase(#2))(j,i,:,i).u(j)";
 
    assem.set(ss.str());
    assem.push_mi(mim);
    assem.push_mf(mf_u);
    assem.push_mf(mf_mult);
    assem.push_data(Un);
    assem.push_vec(R);
    assem.assembly(rg);
  }

    

  template<typename MODEL_STATE = standard_model_state>
  class mdbrick_NS_nonref1 : public mdbrick_constraint<MODEL_STATE> {
    
    TYPEDEF_MODEL_STATE_TYPES;

    size_type boundary;
    bool mfdata_set, B_to_be_computed, Un_is_modified;
    gmm::sub_index SUB_CT;
    const mesh_fem *mf_mult;
    VECTOR Un;
    scalar_type dt;
    
    const mesh_fem &mf_u() { return *(this->mesh_fems[this->num_fem]); }
    const mesh_im  &mim() { return *(this->mesh_ims[0]); }

    void compute_constraints(unsigned version) {
      size_type ndu = mf_u().nb_dof(), ndm = mf_mult->nb_dof();
      gmm::row_matrix<gmm::rsvector<value_type> > M(ndm, ndu);
      VECTOR V(ndm);
      GMM_TRACE2("Assembling Dirichlet constraints, version " << version);
      if ((version | ASMDIR_BUILDH)) {
	asm_mass_matrix(M, mim(), mf_u(), *mf_mult,
			mf_u().linked_mesh().get_mpi_region());
      }
      if ((version | ASMDIR_BUILDR)) {
	asm_nonref_right_hand_side(V, mim(), mf_u(), *mf_mult, Un, mf_u().linked_mesh().get_mpi_sub_region(boundary));
      }
      if (version & ASMDIR_BUILDH)
	gmm::copy(gmm::sub_matrix(M, SUB_CT, gmm::sub_interval(0, ndu)), 
		  this->B);
      gmm::copy(gmm::sub_vector(V, SUB_CT), this->CRHS);
    }

    virtual void recompute_B_sizes(void) {
      size_type nd = mf_u().nb_dof();
      dal::bit_vector dof_on_bound;
      if (mf_mult->is_reduced())
	dof_on_bound.add(0, nd);
      else
	dof_on_bound = mf_mult->basic_dof_on_region(boundary);
      size_type nb_const = dof_on_bound.card();
      std::vector<size_type> ind_ct;
      for (dal::bv_visitor i(dof_on_bound); !i.finished(); ++i)
	ind_ct.push_back(i);
      SUB_CT = gmm::sub_index(ind_ct);
      gmm::resize(this->B, nb_const, nd);
      gmm::resize(this->CRHS, nb_const);
      B_to_be_computed = true;
    }

    virtual void recompute_B(void) {
      unsigned version = 0;
      if (Un_is_modified) { version = ASMDIR_BUILDR; }
      if (B_to_be_computed) { version = ASMDIR_BUILDR | ASMDIR_BUILDH; }
      if (version) { 
	compute_constraints(version);
	this->parameters_set_uptodate();
	B_to_be_computed = false; Un_is_modified = false;
      }
    }

  public :

    void set_Un(const VECTOR &U) {
      Un = U;
      Un_is_modified = true;
    }

    mdbrick_NS_nonref1(mdbrick_abstract<MODEL_STATE> &problem,
		       size_type bound, scalar_type dt_,
		       const mesh_fem &mf_mult_ = dummy_mesh_fem(), 
		       size_type num_fem_=0)
      : mdbrick_constraint<MODEL_STATE>(problem, num_fem_), 
	boundary(bound) {
      dt = dt_;
      mf_mult = (&mf_mult_ == &dummy_mesh_fem()) ? &(mf_u()) : &mf_mult_;
      GMM_ASSERT1(mf_mult->get_qdim() == mf_u().get_qdim(), "The lagrange multipliers mesh fem "
		  "for the mdbrick_NS_nonref1 brick should have the same Qdim as "
		  "the main mesh_fem");

      this->add_proper_boundary_info(this->num_fem, boundary, 
				     MDBRICK_DIRICHLET);
      this->add_dependency(*mf_mult);
      mfdata_set = false; B_to_be_computed = true; Un_is_modified = false;
      this->force_update();
    }
  };



  /* non reflective boundary conditions */


  // construction du terme de droite dans [M]*Unp1=F
  // mise en place de Un + Un.N*(dUn/dn).N
  template <typename VEC1, typename VEC2>
  void asm_basic_non_reflective_bc(VEC1 &VV, 
				   const getfem::mesh_im &mim, 
				   const getfem::mesh_fem &mf_u, 
				   const VEC2 &Un0, 
				   const getfem::mesh_fem &mf_mult,
				   scalar_type dt,
				   const getfem::mesh_region &rg) {
    getfem::generic_assembly assem;
    std::stringstream ss;
    ss << "u=data$1(#1); "
      "V(#2)+="
       << -dt << "*"
      " comp(vBase(#1).Normal().vGrad(#1).Normal().vBase(#2))(l,i,i,m,k,j,j,:,k).u(l).u(m)+"     //"(l,i,i,m,j,k,j,:,k).u(l).u(m)+"
      "comp(vBase(#1).vBase(#2))(j,i,:,i).u(j)";                                         //"comp(vBase(#1).vBase(#2).u(j))(j,i,:,i)";
    assem.set(ss.str());
    assem.push_mi(mim);
    assem.push_mf(mf_u);
    assem.push_mf(mf_mult);  
    assem.push_data(Un0);
    assem.push_vec(VV);
    assem.assembly(rg);
  }

  template<typename VECT1> class improved_non_reflective_bc_nonlinear_term 
    : public getfem::nonlinear_elem_term {
    const mesh_fem &mf;
    std::vector<scalar_type> U;
    scalar_type dt, nu;
    size_type N;
    base_vector coeff, valU;
    base_matrix gradU, hessU;
    bgeot::multi_index sizes_;
  public:
    improved_non_reflective_bc_nonlinear_term
    (const mesh_fem &mf_, const VECT1 &U_, scalar_type dt_, scalar_type nu_)
      : mf(mf_), U(mf_.nb_basic_dof()), dt(dt_), nu(nu_), N(mf_.get_qdim()), 
	valU(N), gradU(N, N), hessU(N,N*N) {
      sizes_.resize(1); sizes_[0] = short_type(N); /*assert(N == 2);*/
      mf.extend_vector(U_, U);
    }
    const bgeot::multi_index &sizes() const {  return sizes_; }
    virtual void compute(getfem::fem_interpolation_context& ctx,
			 bgeot::base_tensor &t) {
      size_type cv = ctx.convex_num();
      coeff.resize(mf.nb_basic_dof_of_element(cv));
      gmm::copy(gmm::sub_vector(U, gmm::sub_index(mf.ind_basic_dof_of_element(cv))),
		coeff);
      ctx.pf()->interpolation(ctx, coeff, valU, mf.get_qdim());
      ctx.pf()->interpolation_grad(ctx, coeff, gradU, mf.get_qdim());
      ctx.pf()->interpolation_hess(ctx, coeff, hessU, mf.get_qdim());

      if (N==2){
	t[0] = (valU[0] +  nu *dt* hessU(0,3) ) / (1 + gradU(0,0)*dt);
	t[1] =  valU[1] +   nu *dt* hessU(1,3) - dt * t[0] * gradU(1,0);
      }
      if (N==3) {
	t[0] = (valU[0] + nu *dt* hessU(0,4) ) / (1 + gradU(0,0)*dt);
	t[1] =  valU[1] + nu *dt* hessU(1,4)  - dt * t[0] * gradU(1,0);
	t[2] =  valU[2] + nu *dt* hessU(2,4)  - dt * t[0] * gradU(2,0);
      }
    }
  };


  template <typename VEC1, typename VEC2>
  void asm_improved_non_reflective_bc(VEC1 &VV, 
				      const getfem::mesh_im &mim, 
				      const getfem::mesh_fem &mf_u, 
				      const VEC2 &Un0, 
				      const getfem::mesh_fem &mf_mult,
				      scalar_type dt, scalar_type nu,
				      const getfem::mesh_region &rg) {
    getfem::generic_assembly assem;
    improved_non_reflective_bc_nonlinear_term<VEC2> nlterm(mf_u, Un0, dt, nu);
    assem.set("V(#2)+=comp(NonLin(#1).vBase(#2))(i,:,i)");
    assem.push_mi(mim);
    assem.push_mf(mf_u);
    assem.push_mf(mf_mult);  
    assem.push_vec(VV);
    assem.push_nonlinear_term(&nlterm);
    assem.assembly(rg);
  }



}
#endif
