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# ifndef _RHEOLEF_FORM_WEIGHTED_H
# define _RHEOLEF_FORM_WEIGHTED_H
///
/// This file is part of Rheolef.
///
/// Copyright (C) 2000-2009 Pierre Saramito <Pierre.Saramito@imag.fr>
///
/// Rheolef is free software; you can redistribute it and/or modify
/// it under the terms of the GNU General Public License as published by
/// the Free Software Foundation; either version 2 of the License, or
/// (at your option) any later version.
///
/// Rheolef 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 License for more details.
///
/// You should have received a copy of the GNU General Public License
/// along with Rheolef; if not, write to the Free Software
/// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
/// 
/// =========================================================================
// form constructor: old interface with name
// maintained for backward compatibility purpose
//
#include "rheolef/form.h"
#include "rheolef/field_vf_expr_ops.h"
#include "rheolef/form_vf_expr_ops.h"
#include "rheolef/operators2.h"
#include "rheolef/form_vf_assembly.h"
namespace rheolef { 

// backward compat with named forms:
// for each weight, it compiles all cases
// => not very efficient !
template<class T, class M, class WeightFunction>
bool
form_named_init (
    form_basic<T,M>&        a,
    const geo_basic<T,M>&   dom,
    const std::string&      name,
    bool                    has_weight,
    WeightFunction          w,
    const quadrature_option_type& qopt)
{
  // backward compatibility code:
  // branch to variational formulation routines:
  test_basic<T,M,details::vf_tag_10> u (a.get_first_space()); // trial
  test_basic<T,M,details::vf_tag_01> v (a.get_second_space()); // test
  // --------------------------------
  if (name == "mass") {
  // --------------------------------
    switch (a.get_first_space().valued_tag()) {
      case space_constant::scalar:
        if (!has_weight) a.assembly (dom, u*v,   qopt);
        else             a.assembly (dom, w*(u*v), qopt);
        return true;
      case space_constant::vector:
        if (!has_weight) a.assembly (dom, dot(u,v),   qopt);
        else             fatal_macro ("unsupported vectorial mass with weight (HINT: use integrate())");
                         // a.assembly (dom, dot(w*u,v), qopt); compil pbs ?
        return true;
      default:
      case space_constant::tensor:
        if (!has_weight) a.assembly (dom, ddot(u,v),   qopt);
        else             fatal_macro ("unsupported tensorial mass with weight (HINT: use integrate())");
                         // a.assembly (dom, ddot(w*u,v), qopt); compil pbs ?
        return true;
    }
  // --------------------------------
  } else if (name == "inv_mass") {
  // --------------------------------
    check_macro (!has_weight, "unsupported weighted "<<name<<" form (HINT: use integrate())");
    form_option_type fopt (qopt);
    fopt.invert = true;
    switch (a.get_first_space().valued_tag()) {
      case space_constant::scalar: a.assembly (dom, u*v,   fopt); return true;
      case space_constant::vector: a.assembly (dom, dot(u,v),   fopt); return true;
      default:
      case space_constant::tensor: a.assembly (dom, ddot(u,v),   fopt); return true;
    }
  // --------------------------------
  } else if (name == "lumped_mass") {
  // --------------------------------
    check_macro (!has_weight, "unsupported weighted "<<name<<" form (HINT: use integrate())");
    form_option_type fopt (qopt);
    fopt.lump = true;
    switch (a.get_first_space().valued_tag()) {
      case space_constant::scalar: a.assembly (dom, u*v,   fopt); return true;
      case space_constant::vector: a.assembly (dom, dot(u,v),   fopt); return true;
      default:
      case space_constant::tensor: a.assembly (dom, ddot(u,v),   fopt); return true;
    }
  // --------------------------------
  } else if (name == "grad") {
  // --------------------------------
        if (!has_weight) a.assembly (dom, dot(grad(u),v),   qopt);
        else             a.assembly (dom, dot(w*grad(u),v), qopt);
        return true;
  // --------------------------------
  } else if (name == "div") {
  // --------------------------------
        check_macro (!has_weight, "unsupported weighted "<<name<<" form (HINT: use integrate())");
        a.assembly (dom, div(u)*v,   qopt);
        return true;
  // --------------------------------
  } else if (name == "2D") {
  // --------------------------------
        if (!has_weight) a.assembly (dom, 2.*ddot(D(u),v),   qopt);
        else             a.assembly (dom, 2.*ddot(w*D(u),v), qopt);
        return true;
  // --------------------------------
  } else if (name == "grad_grad") {
  // --------------------------------
    switch (a.get_first_space().valued_tag()) {
      case space_constant::scalar:
        if (!has_weight) a.assembly (dom, dot(grad(u),grad(v)),   qopt);
        else             a.assembly (dom, dot(w*grad(u),grad(v)), qopt);
        return true;
      default:
      case space_constant::vector:
        if (!has_weight) a.assembly (dom, ddot(grad(u),grad(v)),   qopt);
        else             a.assembly (dom, ddot(w*grad(u),grad(v)), qopt);
        return true;
    }
  // --------------------------------
  } else if (name == "2D_D") {
  // --------------------------------
        if (!has_weight) a.assembly (dom, 2.*ddot(D(u),D(v)),   qopt);
        else             a.assembly (dom, 2.*ddot(w*D(u),D(v)), qopt);
        return true;
  // --------------------------------
  } else if (name == "div_div") {
  // --------------------------------
        check_macro (!has_weight, "unsupported weighted "<<name<<" form (HINT: use integrate())");
        a.assembly (dom, div(u)*div(v),   qopt);
        return true;
  // --------------------------------
  } else if (name == "curl") {
  // --------------------------------
        check_macro (!has_weight, "unsupported weighted "<<name<<" form (HINT: use integrate())");
        if (u.get_vf_space().get_geo().dimension() == 2 &&
            u.get_vf_space().valued_tag() == space_constant::vector) 
		a.assembly (dom, curl(u)*v, qopt);
	else    a.assembly (dom, dot(curl(u),v), qopt);
        return true;
  }
  return false;
}
template<class T, class M>
template<class WeightFunction>
void
form_basic<T,M>::form_init (
    const std::string&      name,
    bool                    has_weight,
    WeightFunction          w,
    const quadrature_option_type& qopt)
{
    if (name == "" || name == "nul" || name == "null") {
      // empty name => nul form, but with declared csr matrix sizes
      _uu.resize (_Y.iu_ownership(), _X.iu_ownership());
      _ub.resize (_Y.iu_ownership(), _X.ib_ownership());
      _bu.resize (_Y.ib_ownership(), _X.iu_ownership());
      _bb.resize (_Y.ib_ownership(), _X.ib_ownership());
      return;
    }
    // determine the domain of integration:
    typedef typename form_basic<T,M>::float_type float_type;
    check_macro (_X.get_geo().get_background_geo() == _Y.get_geo().get_background_geo(), 
	"form("<<name<<") between incompatible geo " << _X.get_geo().name() << " and " << _Y.get_geo().name());
    bool X_is_on_domain = (_X.get_geo().variant() == geo_abstract_base_rep<float_type>::geo_domain);
    bool Y_is_on_domain = (_Y.get_geo().variant() == geo_abstract_base_rep<float_type>::geo_domain);
    geo_basic<T,M> dom;
    if ((!X_is_on_domain && ! Y_is_on_domain) || (X_is_on_domain && Y_is_on_domain)) {
        dom = _X.get_geo();
    } else if (X_is_on_domain) {
        dom = _X.get_geo().get_background_domain();
    } else {// Y_is_on_domain
        dom = _Y.get_geo().get_background_domain();
    }
    // try the new form initializer interface:
    if (form_named_init (*this, dom, name, has_weight, w, qopt)) return;

    fatal_macro ("unsupported form name: \""<<name<<"\" (HINT: use integrate())");
}
template<class T, class M>
template<class Function>
inline
form_basic<T,M>::form_basic (
  const space_type& X, 
  const space_type& Y,
  const std::string& name,
  Function weight,
  const quadrature_option_type& qopt)
  : _X(X),
    _Y(Y),
    _uu(),
    _ub(),
    _bu(),
    _bb()
{
    form_init (name, true, weight, qopt);
}
// ================================================================
// also for Robin boundary conditions with a non-constant coef
// ================================================================
template<class T, class M>
template<class WeightFunction>
void
form_basic<T,M>::form_init_on_domain (
    const std::string&            name,
    const geo_basic<T,M>&         gamma,
    bool                          has_weight,
    WeightFunction                w,
    const geo_basic<T,M>&         w_omega,
    const quadrature_option_type& qopt)
{
    const geo_basic<T,M>& omega = _X.get_geo().get_background_geo();

    // try the new interface:
    if (form_named_init (*this, gamma, name, has_weight, w, qopt)) return;
    fatal_macro ("unsupported form name: \""<<name<<"\"");
}
template<class T, class M>
template<class Function>
form_basic<T,M>::form_basic (
    const space_type& X, 
    const space_type& Y,
    const std::string& name,
    const geo_basic<T,M>& gamma,
    Function weight,
    const quadrature_option_type& qopt)
  : _X(X), 
    _Y(Y), 
    _uu(),
    _ub(),
    _bu(),
    _bb()
{
    // example:
    //    form m (V,V,"mass",gamma, weight);  e.g. \int_\Gamma trace(u) trace(v) weight(x) ds     
    // with:
    //    geo omega ("square");
    //    geo gamma = omega["boundary"];
    //    V = space(omega,"P1");
    // Note: transform the domain gamma into a compacted-mesh for the 
    // evaluation of the weight
    form_init_on_domain (name, gamma, true, weight, compact(gamma), qopt);
}

}// namespace rheolef
# endif /* _RHEOLEF_FORM_WEIGHTED_H */