/*
 *~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *<LicenseText>
 *
 * CitcomS by Louis Moresi, Shijie Zhong, Lijie Han, Eh Tan,
 * Clint Conrad, Michael Gurnis, and Eun-seo Choi.
 * Copyright (C) 1994-2005, California Institute of Technology.
 *
 * This program 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.
 *
 * 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 License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *</LicenseText>
 *
 *~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */
#include <math.h>
#include <sys/types.h>
#include "element_definitions.h"
#include "global_defs.h"
#include "drive_solvers.h"

float global_fvdot();
float vnorm_nonnewt();


/************************************************************/

void general_stokes_solver_setup(struct All_variables *E)
{
  int i, m;

  if (E->control.NMULTIGRID || E->control.NASSEMBLE)
    construct_node_maps(E);
  else
    for (i=E->mesh.gridmin;i<=E->mesh.gridmax;i++)
      for (m=1;m<=E->sphere.caps_per_proc;m++)
	E->elt_k[i][m]=(struct EK *)malloc((E->lmesh.NEL[i]+1)*sizeof(struct EK));


  return;
}




void general_stokes_solver(struct All_variables *E)
{
  void solve_constrained_flow_iterative();
  void construct_stiffness_B_matrix();
  void velocities_conform_bcs();
  void assemble_forces();
  void sphere_harmonics_layer();
  double global_vdot(),kineticE_radial();
  float global_fvdot();
  float vnorm_nonnewt();
  void get_system_viscosity();

  float vmag;

  double Udot_mag, dUdot_mag;
  int m,count,i,j,k;

  float *oldU[NCS], *delta_U[NCS];

  const int nno = E->lmesh.nno;
  const int nel = E->lmesh.nel;
  const int nnov = E->lmesh.nnov;
  const int neq = E->lmesh.neq;
  const int vpts = vpoints[E->mesh.nsd];
  const int dims = E->mesh.nsd;
  const int addi_dof = additional_dof[dims];

  velocities_conform_bcs(E,E->U);

  assemble_forces(E,0);

  if(E->monitor.solution_cycles==0 || E->viscosity.update_allowed) {
    get_system_viscosity(E,1,E->EVI[E->mesh.levmax],E->VI[E->mesh.levmax]);
    construct_stiffness_B_matrix(E);
  }

  solve_constrained_flow_iterative(E);

  if (E->viscosity.SDEPV) {

    for (m=1;m<=E->sphere.caps_per_proc;m++)  {
      delta_U[m] = (float *)malloc((neq+2)*sizeof(float));
      oldU[m] = (float *)malloc((neq+2)*sizeof(float));
      for(i=0;i<=neq;i++)
	oldU[m][i]=0.0;
    }

    Udot_mag=dUdot_mag=0.0;
    count=1;

    while (1) {

      for (m=1;m<=E->sphere.caps_per_proc;m++)
	for (i=0;i<neq;i++) {
	  delta_U[m][i] = E->U[m][i] - oldU[m][i];
	  oldU[m][i] = E->U[m][i];
	}

      Udot_mag  = sqrt(global_fvdot(E,oldU,oldU,E->mesh.levmax));
      dUdot_mag = vnorm_nonnewt(E,delta_U,oldU,E->mesh.levmax);

      if(E->parallel.me==0){
	fprintf(stderr,"Stress dependent viscosity: DUdot = %.4e (%.4e) for iteration %d\n",dUdot_mag,Udot_mag,count);
	fprintf(E->fp,"Stress dependent viscosity: DUdot = %.4e (%.4e) for iteration %d\n",dUdot_mag,Udot_mag,count);
	fflush(E->fp);
      }

      if (count>50 || dUdot_mag>E->viscosity.sdepv_misfit)
	break;

      get_system_viscosity(E,1,E->EVI[E->mesh.levmax],E->VI[E->mesh.levmax]);
      construct_stiffness_B_matrix(E);
      solve_constrained_flow_iterative(E);

      count++;

    } /*end while*/

    for (m=1;m<=E->sphere.caps_per_proc;m++)  {
      free((void *) oldU[m]);
      free((void *) delta_U[m]);
    }

  } /*end if SDEPV*/

  return;
}

void general_stokes_solver_pseudo_surf(struct All_variables *E)
{
  void solve_constrained_flow_iterative_pseudo_surf();
  void construct_stiffness_B_matrix();
  void velocities_conform_bcs();
  void assemble_forces_pseudo_surf();
  float global_fvdot();
  float vnorm_nonnewt();
  void get_system_viscosity();
  void std_timestep();
  void get_STD_freesurf(struct All_variables *, float**);

  float vmag;

  double Udot_mag, dUdot_mag;
  int m,count,i,j,k,topo_loop;

  float *oldU[NCS], *delta_U[NCS];

  const int nno = E->lmesh.nno;
  const int nel = E->lmesh.nel;
  const int nnov = E->lmesh.nnov;
  const int neq = E->lmesh.neq;
  const int vpts = vpoints[E->mesh.nsd];
  const int dims = E->mesh.nsd;
  const int addi_dof = additional_dof[dims];

  velocities_conform_bcs(E,E->U);

  E->monitor.stop_topo_loop = 0;
  E->monitor.topo_loop = 0;
  if(E->monitor.solution_cycles==0) std_timestep(E);
  while(E->monitor.stop_topo_loop == 0) {

	  assemble_forces_pseudo_surf(E,0);
	  if(E->monitor.solution_cycles==0 || E->viscosity.update_allowed) {
		  get_system_viscosity(E,1,E->EVI[E->mesh.levmax],E->VI[E->mesh.levmax]);
		  construct_stiffness_B_matrix(E);
	  }
	  solve_constrained_flow_iterative_pseudo_surf(E);

	  if (E->viscosity.SDEPV) {

		  for (m=1;m<=E->sphere.caps_per_proc;m++)  {
			  delta_U[m] = (float *)malloc((neq+2)*sizeof(float));
			  oldU[m] = (float *)malloc((neq+2)*sizeof(float));
			  for(i=0;i<=neq;i++)
				  oldU[m][i]=0.0;
		  }

		  Udot_mag=dUdot_mag=0.0;
		  count=1;

		  while (1) {

			  for (m=1;m<=E->sphere.caps_per_proc;m++)
				  for (i=0;i<neq;i++) {
					  delta_U[m][i] = E->U[m][i] - oldU[m][i];
					  oldU[m][i] = E->U[m][i];
				  }

			  Udot_mag  = sqrt(global_fvdot(E,oldU,oldU,E->mesh.levmax));
			  dUdot_mag = vnorm_nonnewt(E,delta_U,oldU,E->mesh.levmax);

			  if(E->parallel.me==0){
				  fprintf(stderr,"Stress dependent viscosity: DUdot = %.4e (%.4e) for iteration %d\n",dUdot_mag,Udot_mag,count);
				  fprintf(E->fp,"Stress dependent viscosity: DUdot = %.4e (%.4e) for iteration %d\n",dUdot_mag,Udot_mag,count);
				  fflush(E->fp);
			  }

			  if (count>50 || dUdot_mag>E->viscosity.sdepv_misfit)
				  break;

			  get_system_viscosity(E,1,E->EVI[E->mesh.levmax],E->VI[E->mesh.levmax]);
			  construct_stiffness_B_matrix(E);
			  solve_constrained_flow_iterative_pseudo_surf(E);

			  count++;

		  } /*end while */
		  for (m=1;m<=E->sphere.caps_per_proc;m++)  {
			  free((void *) oldU[m]);
			  free((void *) delta_U[m]);
		  }

	  } /*end if SDEPV */
	  E->monitor.topo_loop++;
  }
  get_STD_freesurf(E,E->slice.freesurf);

  return;
}