#include <med.h>
#define MESGERR 1
#include <med_utils.h>
#include <string.h>
int main (int argc, char **argv) {
  med_idt fid;
  char meshname[MED_NAME_SIZE+1] = "2D unstructured mesh";
  med_int spacedim = 2;
  med_int meshdim = 2;
  char axisname[2*MED_SNAME_SIZE+1] = "x               y               ";
  char unitname[2*MED_SNAME_SIZE+1] = "cm              cm              ";
  med_float coordinates[30] = { 2.,1.,  7.,1.,  12.,1.,  17.,1.,  22.,1.,
                                2.,6.,  7.,6.,  12.,6.,  17.,6.,  22.,6.,
                                2.,11., 7.,11., 12.,11., 17.,11., 22.,11.};
  med_int nnodes = 15;
  med_int triaconnectivity[24] = { 1,7,6,   2,7,1,  3,7,2,   8,7,3,   
                                   13,7,8, 12,7,13, 11,7,12, 6,7,11 };
  med_int ntria3 = 8;
  med_int quadconnectivity[16] = {3,4,9,8,    4,5,10,9, 
                                  15,14,9,10, 13,8,9,14};
  med_int nquad4 = 4;
  
  
  fid = MEDfileOpen("UsesCase_MEDmesh_1.med",MED_ACC_CREAT);
  if (fid < 0) {
    MESSAGE("ERROR : file creation ...");
    return -1;
  }
  
  if (MEDfileCommentWr(fid,"A 2D unstructured mesh : 15 nodes, 12 cells") < 0) {
    MESSAGE("ERROR : write file description ...");
    return -1;
  }
  
  
  if (MEDmeshCr(fid, meshname, spacedim, meshdim, MED_UNSTRUCTURED_MESH, 
                "A 2D unstructured mesh","",MED_SORT_DTIT,MED_CARTESIAN, axisname, unitname) < 0) {
    MESSAGE("ERROR : mesh creation ...");
    return -1;
  }
  
  if (MEDmeshNodeCoordinateWr(fid, meshname, MED_NO_DT, MED_NO_IT, 0.0,
                              MED_FULL_INTERLACE, nnodes, coordinates) < 0) {
    MESSAGE("ERROR : nodes coordinates ...");
    return -1;
  }
  
  if (MEDmeshElementConnectivityWr(fid, meshname, MED_NO_DT, MED_NO_IT, 0.0, MED_CELL, MED_TRIA3,
                                   MED_NODAL, MED_FULL_INTERLACE, ntria3, triaconnectivity) < 0) {
    MESSAGE("ERROR : triangular cells connectivity ...");
    return -1;
  }
  if (MEDmeshElementConnectivityWr(fid, meshname, MED_NO_DT, MED_NO_IT, 0.0, MED_CELL, MED_QUAD4,
                                   MED_NODAL, MED_FULL_INTERLACE, nquad4, quadconnectivity) < 0) {
    MESSAGE("ERROR : quadrangular cells connectivity ...");
    return -1;
  }
  
  if (MEDfamilyCr(fid, meshname,"", 0, 0, "") < 0) {
    MESSAGE("ERROR : quadrangular cells connectivity ...");
    return -1;
  }
  
  
  if (MEDfileClose(fid)  < 0) {
    MESSAGE("ERROR : close file ...");
    return -1;
  }
  return 0;
}