#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;
  int ret = -1;
  
  fid = MEDfileOpen("UsesCase_MEDmesh_1.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 ...");
    goto ERROR;
  }
  
  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 ...");
    goto ERROR;
  }
  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 ...");
    goto ERROR;
  }
  
  ret = 0;
 ERROR :
  
  if (coordinates)
    free(coordinates);
  if (triaconnectivity)
    free(triaconnectivity);
  if (quadconnectivity)
    free(quadconnectivity);
  
  if (MEDfileClose(fid) < 0) {
    MESSAGE("ERROR : close file");             
    ret = -1; 
  } 
  return ret;
}