#include <med.h>
#define MESGERR 1
#include <med_utils.h>
#include <string.h>
int main (int argc, char **argv) {
  med_idt fid;
  const char meshname[MED_NAME_SIZE+1] = "2D unstructured mesh";
  char meshdescription[MED_COMMENT_SIZE+1]="";
  med_int meshdim;
  med_int spacedim;
  med_sorting_type sortingtype;
  med_int nstep;
  med_mesh_type meshtype;
  med_axis_type axistype;
  char axisname[2*MED_SNAME_SIZE+1]="";
  char unitname[2*MED_SNAME_SIZE+1]="";
  char dtunit[MED_SNAME_SIZE+1];
  med_float *coordinates = NULL;
  med_int nnodes = 0;
  med_int *triaconnectivity = NULL;
  med_int ntria3 = 0;
  med_int *quadconnectivity = NULL;
  med_int nquad4 = 0;
  med_bool coordinatechangement;
  med_bool geotransformation;
  int i;
  med_int nfamily, ngroup;
  med_int familynumber;
  char *groupname=NULL;
  char familyname[MED_NAME_SIZE+1]="";
  med_int *familynumbers = NULL;
  int ret=-1;
  
  fid = MEDfileOpen("UsesCase_MEDmesh_10.med",MED_ACC_RDONLY);
  if (fid < 0) {
    MESSAGE("ERROR : open file in READ ONLY ACCESS mode ...");
    goto ERROR;
  }
  
  
  if (MEDmeshInfoByName(fid, meshname, &spacedim, &meshdim, &meshtype, meshdescription, 
                        dtunit, &sortingtype, &nstep, &axistype, axisname, unitname) < 0) {
    MESSAGE("ERROR : mesh info ...");
    goto ERROR;
  }
  
  if ((nnodes = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_NO_GEOTYPE,
                               MED_COORDINATE, MED_NO_CMODE,&coordinatechangement,
                               &geotransformation)) < 0) {
    MESSAGE("ERROR : number of nodes ...");
    goto ERROR;
  }
  
  
  
  if ((ntria3 = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,MED_TRIA3,
                               MED_CONNECTIVITY, MED_NODAL,&coordinatechangement,
                               &geotransformation)) < 0) {
    MESSAGE("ERROR : number of MED_TRIA3 ...");
    goto ERROR;
  }
  
  if ((nquad4 = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,MED_QUAD4,
                               MED_CONNECTIVITY, MED_NODAL, &coordinatechangement,
                               &geotransformation)) < 0) {
    MESSAGE("ERROR : number of MED_QUAD4 ...");
    goto ERROR;
  }
  
  if ((coordinates = (med_float*) malloc(sizeof(med_float)*nnodes*spacedim)) == NULL) {
    MESSAGE("ERROR : memory allocation ...");
    goto ERROR;
  }
  if (MEDmeshNodeCoordinateRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_FULL_INTERLACE,
                              coordinates) < 0) {
    MESSAGE("ERROR : nodes coordinates ...");
    free(coordinates);
    goto ERROR;
  }
  free(coordinates);
  
  if ((triaconnectivity = (med_int *) malloc(sizeof(med_int)*ntria3*3)) == NULL) {
    MESSAGE("ERROR : memory allocation ...");
    goto ERROR;
  }
  if (MEDmeshElementConnectivityRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,
                                   MED_TRIA3, MED_NODAL, MED_FULL_INTERLACE, triaconnectivity) < 0) {
    MESSAGE("ERROR : MED_TRIA3 connectivity ...");
    free(triaconnectivity);
    goto ERROR;
  }
  free(triaconnectivity);
  if ((quadconnectivity = (med_int *) malloc(sizeof(med_int)*nquad4*4)) == NULL) {
    MESSAGE("ERROR : memory allocation ...");
    goto ERROR;
  }
  if (MEDmeshElementConnectivityRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,
                                   MED_QUAD4, MED_NODAL, MED_FULL_INTERLACE, quadconnectivity) < 0) {
    MESSAGE("ERROR : MED_TRIA3 connectivity ...");
    free(quadconnectivity);
    goto ERROR;
  }
  free(quadconnectivity);
  
  if ((nfamily = MEDnFamily(fid,meshname)) < 0) {
    MESSAGE("ERROR : read number of family ...");
    goto ERROR;
  }
  
  for (i=0; i<nfamily ; i++) {
    if ((ngroup = MEDnFamilyGroup(fid, meshname, i+1)) < 0) {
      MESSAGE("ERROR : read number of group in a family ...");
      goto ERROR;
    }
    
    if (ngroup > 0) {
      if ((groupname = (char*) malloc(sizeof(char)*MED_LNAME_SIZE*ngroup+1)) == NULL) {
        MESSAGE("ERROR : memory allocation ...");
        goto ERROR;
      }
      
      if (MEDfamilyInfo(fid, meshname, i+1, familyname, &familynumber, groupname) < 0) {
        MESSAGE("ERROR : family info ...");
        free(groupname);
        goto ERROR;
      }
      free(groupname);
    }
    
  }
  
  
  if ((familynumbers = (med_int *) malloc(sizeof(med_int)*nnodes)) == NULL) {
    MESSAGE("ERROR : memory allocation ...");
    goto ERROR;
  }
  if (MEDmeshEntityFamilyNumberRd(fid, meshname, MED_NO_DT, MED_NO_IT,
                                  MED_NODE,MED_NONE,familynumbers ) < 0) 
    for (i=0; i<nnodes; i++) *(familynumbers+i) = 0;
  for (i=0; i<nnodes; i++) printf("%d - ", *(familynumbers+i));
  if (familynumbers)
    free (familynumbers);
  
  if ((familynumbers = (med_int *) malloc(sizeof(med_int)*ntria3)) == NULL) {
    MESSAGE("ERROR : memory allocation ...");
    goto ERROR;
  }
  if (MEDmeshEntityFamilyNumberRd(fid, meshname, MED_NO_DT, MED_NO_IT,
                                  MED_CELL,MED_TRIA3,familynumbers ) < 0) 
    for (i=0; i<ntria3; i++) *(familynumbers+i) = 0;
    free (familynumbers);
  if ((familynumbers = (med_int *) malloc(sizeof(med_int)*nquad4)) == NULL) {
    MESSAGE("ERROR : memory allocation ...");
    goto ERROR;
  }
  if (MEDmeshEntityFamilyNumberRd(fid, meshname, MED_NO_DT, MED_NO_IT,
                                  MED_CELL,MED_QUAD4,familynumbers ) < 0) 
    for (i=0; i<nquad4; i++) *(familynumbers+i) = 0;
  free (familynumbers);
  ret=0;
 ERROR:
  
  if (MEDfileClose(fid) < 0) {
    MESSAGE("ERROR : close file");             
    ret= -1; 
  } 
  return ret;
}