/*@@
   @file      jacobi_wrapper.c
   @date      Tue Aug 24 12:50:07 1999
   @author    Gerd Lanfermann
   @desc 
   The C wrapper, which calles the core Fortran routine, which 
   performs the actual solve.
   We cannot derive the pointers to the GF data from the indeces in 
   Fortran. So we do this here in C and then pass the everything 
   over to the Fortran routine.

   This wrapper is registers with the Elliptic solver registry 
   (not the Fortran file) , as coded up in ./CactusElliptic/EllBase
   @enddesc 
 @@*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "cctk.h"
#include "cctk_parameters.h"
#include "cctk_FortranString.h"

void FORTRAN_NAME(sor_confmetric_core3d)(_CCTK_C2F_PROTO(GH),
                                         int *, CCTK_REAL *,
                                         int *, CCTK_REAL *,
                                         CCTK_REAL *,
                                         CCTK_REAL *,CCTK_REAL *,CCTK_REAL *,
                                         CCTK_REAL *,CCTK_REAL *,CCTK_REAL *, 
                                         CCTK_REAL *, int *, CCTK_REAL *, CCTK_REAL *);

void FORTRAN_NAME(sor_flat_core3d)(_CCTK_C2F_PROTO(GH),
                                         int *, CCTK_REAL *,
                                         int *, CCTK_REAL *,
                                         CCTK_REAL *, int *, CCTK_REAL *, CCTK_REAL *);

/* We pass in the arguments that are neccessary for this class of elliptic eq. 
   this solver is intended to solve. See ./CactusElliptic/EllBase/src/ for the
   classes of elliptic eq. */
void sor_confmetric(cGH *GH, int *MetricPsiI, int FieldIndex, 
		    int MIndex, int NIndex, CCTK_REAL *AbsTol,CCTK_REAL *RelTol) {

  CCTK_REAL *gxx=NULL, *gxy=NULL, *gxz=NULL;
  CCTK_REAL *gyy=NULL, *gyz=NULL, *gzz=NULL;
  CCTK_REAL *psi=NULL;
  CCTK_REAL *Mlinear=NULL, *Nsources=NULL;
  CCTK_REAL *Field  =NULL;
  
  CCTK_REAL tolerance;
  int i;
  int toltype;

  int Mlinear_lsh[3], Nsource_lsh[3];

  int retcode;
  
  /* derive the metric data pointer from the index array. Note the ordering.
     Also get datapointers to the field to solve for. 
     All of these are mandatory */
  gxx = (CCTK_REAL*) CCTK_VarDataPtrI(GH, 0, MetricPsiI[0]);
  gxy = (CCTK_REAL*) CCTK_VarDataPtrI(GH, 0, MetricPsiI[1]);
  gxz = (CCTK_REAL*) CCTK_VarDataPtrI(GH, 0, MetricPsiI[2]);
  gyy = (CCTK_REAL*) CCTK_VarDataPtrI(GH, 0, MetricPsiI[3]);
  gyz = (CCTK_REAL*) CCTK_VarDataPtrI(GH, 0, MetricPsiI[4]);
  gzz = (CCTK_REAL*) CCTK_VarDataPtrI(GH, 0, MetricPsiI[5]);
  psi = (CCTK_REAL*) CCTK_VarDataPtrI(GH, 0, MetricPsiI[6]);

  Field = (CCTK_REAL*) CCTK_VarDataPtrI(GH,0,FieldIndex);

  if ((!gxx)||(!gxy)||(!gxz)||(!gyy)||(!gyz)||(!gzz)||(!psi)||(!Field)) 
    CCTK_WARN(0,"SOR_WRAPPER: One of the metric data fields, or the GF to solve could not be found!");
  
  /* derive the data pointer for the fields. the M/N fields are not 
     allocated (better: are of size 1), if the passed index is negative, 
     or we get back an empty GF of size 1 */
  if (MIndex>=0) Mlinear   = (CCTK_REAL*) CCTK_VarDataPtrI(GH,0,MIndex);
  if (NIndex>=0) Nsources  = (CCTK_REAL*) CCTK_VarDataPtrI(GH,0,NIndex);


  /* we pass the size of M/N through to fortran, so F can 
     tell the difference between an allocated GF (Mlinear_lsh.eq.cctk_lsh) or
     unallocated GF (Mlinear_lsh=1).  maximal dimension is three. */

  if (GH->cctk_dim>3) 
    CCTK_WARN(0,"This elliptic solver implementation does not do dimension>3!");

  for (i=0;i<GH->cctk_dim;i++) {
    if((MIndex<0))  Mlinear_lsh[i]=1;
    else            Mlinear_lsh[i]=GH->cctk_lsh[i];
    if((NIndex<0))  Nsource_lsh[i]=1;
    else            Nsource_lsh[i]=GH->cctk_lsh[i];
  }
 

  /* call the fortran routine */
  FORTRAN_NAME(sor_confmetric_core3d)(_PASS_CCTK_C2F(GH),
	 Mlinear_lsh, Mlinear,
         Nsource_lsh, Nsources,
	 gxx,gxy,gxz,gyy,gyz,gzz,psi, 
	 Field, &FieldIndex, AbsTol, RelTol);

}
 

void sor_flat(cGH *GH, int FieldIndex, int MIndex, 
	      int NIndex, CCTK_REAL *AbsTol, CCTK_REAL *RelTol) {

  CCTK_REAL *Mlinear=NULL, *Nsources=NULL;
  CCTK_REAL *Field=NULL; CCTK_REAL tolerance;
  int i;

  int toltype;

  int Mlinear_lsh[3], Nsource_lsh[3];

  int retcode;

  Field = (CCTK_REAL*) CCTK_VarDataPtrI(GH,0,FieldIndex); 
  if (MIndex>0) Mlinear   = (CCTK_REAL*) CCTK_VarDataPtrI(GH,0,MIndex);
  if (NIndex>0) Nsources  = (CCTK_REAL*) CCTK_VarDataPtrI(GH,0,NIndex);

  if (GH->cctk_dim>3) 
    CCTK_WARN(0,"This elliptic solver implementation does not do dimension>3!");
  
  for (i=0;i<GH->cctk_dim;i++) {
    if((MIndex<0))  Mlinear_lsh[i]=1;
    else            Mlinear_lsh[i]=GH->cctk_lsh[i];
    if((NIndex<0))  Nsource_lsh[i]=1;
    else            Nsource_lsh[i]=GH->cctk_lsh[i];
  }

  /* call the fortran routine */
  FORTRAN_NAME(sor_flat_core3d)(_PASS_CCTK_C2F(GH),
	 Mlinear_lsh, Mlinear,
         Nsource_lsh, Nsources,
	 Field, &FieldIndex, AbsTol, RelTol);

}