/*
 * Copyright(C) 1999-2021, 2024 National Technology & Engineering Solutions
 * of Sandia, LLC (NTESS).  Under the terms of Contract DE-NA0003525 with
 * NTESS, the U.S. Government retains certain rights in this software.
 *
 * See packages/seacas/LICENSE for details
 */

#include "exodusII.h"     // for ex_err, etc
#include "exodusII_int.h" // for EX_FATAL, exi_id_lkup, etc

/*! write out the connectivity array */
int ex_int_write_conn(int exoid, ex_entity_id blk_id, const char *type, int var_id,
                      const void_int *var_conn)
{
  int status = 0;
  if (ex_int64_status(exoid) & EX_BULK_INT64_API) {
    status = nc_put_var_longlong(exoid, var_id, var_conn);
  }
  else {
    status = nc_put_var_int(exoid, var_id, var_conn);
  }
  if (status != NC_NOERR) {
    char errmsg[MAX_ERR_LENGTH];
    snprintf(errmsg, MAX_ERR_LENGTH,
             "ERROR: failed to write connectivity array for %s block %" PRId64 " in file id %d",
             type, blk_id, exoid);
    ex_err_fn(exoid, __func__, errmsg, status);
    return status;
  }
  return status;
}

/*!
 * writes the connectivity array for a block
 * \param exoid           exodus file id
 * \param blk_type        type of block
 * \param blk_id          id of block
 * \param node_conn       node-element connectivity
 * \param elem_edge_conn  element-edge connectivity (NULL if none)
 * \param elem_face_conn  element-face connectivity (NULL if none)
 */

int ex_put_conn(int exoid, ex_entity_type blk_type, ex_entity_id blk_id, const void_int *node_conn,
                const void_int *elem_edge_conn, const void_int *elem_face_conn)
{
  int  connid = -1;
  int  status;
  char errmsg[MAX_ERR_LENGTH];

  EX_FUNC_ENTER();
  if (exi_check_valid_file_id(exoid, __func__) == EX_FATAL) {
    EX_FUNC_LEAVE(EX_FATAL);
  }

  int blk_id_ndx = exi_id_lkup(exoid, blk_type, blk_id);
  if (blk_id_ndx <= 0) {
    ex_get_err(NULL, NULL, &status);

    if (status != 0) {
      if (status == EX_NULLENTITY) {
        snprintf(errmsg, MAX_ERR_LENGTH,
                 "Warning: connectivity array not allowed for NULL %s %" PRId64 " in file id %d",
                 ex_name_of_object(blk_type), blk_id, exoid);
        ex_err_fn(exoid, __func__, errmsg, EX_NULLENTITY);
        EX_FUNC_LEAVE(EX_WARN);
      }
      snprintf(errmsg, MAX_ERR_LENGTH,
               "ERROR: failed to locate %s id %" PRId64 " in id array in file id %d",
               ex_name_of_object(blk_type), blk_id, exoid);
      ex_err_fn(exoid, __func__, errmsg, status);
      EX_FUNC_LEAVE(EX_FATAL);
    }
  }

  /* inquire id's of previously defined dimensions  */
  if (node_conn) {
    switch (blk_type) {
    case EX_ELEM_BLOCK: status = nc_inq_varid(exoid, VAR_CONN(blk_id_ndx), &connid); break;
    case EX_FACE_BLOCK: status = nc_inq_varid(exoid, VAR_FBCONN(blk_id_ndx), &connid); break;
    case EX_EDGE_BLOCK: status = nc_inq_varid(exoid, VAR_EBCONN(blk_id_ndx), &connid); break;
    default:
      snprintf(errmsg, MAX_ERR_LENGTH,
               "Internal ERROR: unrecognized block type in switch: %d in file id %d", blk_type,
               exoid);
      ex_err_fn(exoid, __func__, errmsg, EX_BADPARAM);
      EX_FUNC_LEAVE(EX_FATAL);
    }
    if (status != NC_NOERR) {
      snprintf(errmsg, MAX_ERR_LENGTH,
               "ERROR: failed to locate connectivity array for %s %" PRId64 " in file id %d",
               ex_name_of_object(blk_type), blk_id, exoid);
      ex_err_fn(exoid, __func__, errmsg, status);
      EX_FUNC_LEAVE(EX_FATAL);
    }

    status = ex_int_write_conn(exoid, blk_id, ex_name_of_object(blk_type), connid, node_conn);
    if (status != NC_NOERR) {
      EX_FUNC_LEAVE(EX_FATAL);
    }
  }

  /* If there are edge and face connectivity arrays that belong with the element
   * block, write them now. Warn if they are required but not specified or
   * specified but not required.
   */
  if (blk_type == EX_ELEM_BLOCK) {
    int    nedpereldim, nfapereldim;
    size_t num_ed_per_elem, num_fa_per_elem;

    if (elem_edge_conn != NULL) {
      status = nc_inq_dimid(exoid, DIM_NUM_EDG_PER_EL(blk_id_ndx), &nedpereldim);
      if (status != NC_NOERR) {
        snprintf(errmsg, MAX_ERR_LENGTH,
                 "ERROR: edge connectivity specified but failed to "
                 "locate number of edges/element in block %" PRId64 " in file id %d",
                 blk_id, exoid);
        ex_err_fn(exoid, __func__, errmsg, status);
        EX_FUNC_LEAVE(EX_FATAL);
      }
    }

    if (elem_face_conn != NULL) {
      status = nc_inq_dimid(exoid, DIM_NUM_FAC_PER_EL(blk_id_ndx), &nfapereldim);
      if (status != NC_NOERR) {
        snprintf(errmsg, MAX_ERR_LENGTH,
                 "ERROR: face connectivity specified but failed to "
                 "locate number of faces/element in block %" PRId64 " in file id %d",
                 blk_id, exoid);
        ex_err_fn(exoid, __func__, errmsg, status);
        EX_FUNC_LEAVE(EX_FATAL);
      }
    }

    num_ed_per_elem = 0;
    if ((elem_edge_conn != NULL) &&
        ((status = nc_inq_dimlen(exoid, nedpereldim, &num_ed_per_elem)) != NC_NOERR)) {
      snprintf(errmsg, MAX_ERR_LENGTH,
               "ERROR: failed to get number of edges/elem in block %" PRId64 " in file id %d",
               blk_id, exoid);
      ex_err_fn(exoid, __func__, errmsg, status);
      EX_FUNC_LEAVE(EX_FATAL);
    }

    num_fa_per_elem = 0;
    if ((elem_face_conn != NULL) &&
        ((status = nc_inq_dimlen(exoid, nfapereldim, &num_fa_per_elem)) != NC_NOERR)) {
      snprintf(errmsg, MAX_ERR_LENGTH,
               "ERROR: failed to get number of faces/elem in block %" PRId64 " in file id %d",
               blk_id, exoid);
      ex_err_fn(exoid, __func__, errmsg, status);
      EX_FUNC_LEAVE(EX_FATAL);
    }

    if ((num_ed_per_elem == 0 && elem_edge_conn != NULL) ||
        (num_ed_per_elem != 0 && elem_edge_conn == NULL)) {
      snprintf(errmsg, MAX_ERR_LENGTH,
               "ERROR: number of edges per element (%ld) doesn't "
               "agree with elem_edge_conn (0x%p)",
               (long)num_ed_per_elem, (void *)elem_edge_conn);
      ex_err_fn(exoid, __func__, errmsg, EX_BADPARAM);
      EX_FUNC_LEAVE(EX_FATAL);
    }

    if ((num_fa_per_elem == 0 && elem_face_conn != NULL) ||
        (num_fa_per_elem != 0 && elem_face_conn == NULL)) {
      snprintf(errmsg, MAX_ERR_LENGTH,
               "ERROR: number of faces per element (%ld) doesn't "
               "agree with elem_face_conn (0x%p)",
               (long)num_fa_per_elem, (void *)elem_face_conn);
      ex_err_fn(exoid, __func__, errmsg, EX_BADPARAM);
      EX_FUNC_LEAVE(EX_FATAL);
    }

    if (num_ed_per_elem != 0) {
      status = nc_inq_varid(exoid, VAR_ECONN(blk_id_ndx), &connid);
      if (status != NC_NOERR) {
        snprintf(errmsg, MAX_ERR_LENGTH,
                 "ERROR: failed to locate connectivity array for "
                 "element edge block %" PRId64 " in file id %d",
                 blk_id, exoid);
        ex_err_fn(exoid, __func__, errmsg, status);
        EX_FUNC_LEAVE(EX_FATAL);
      }
      status = ex_int_write_conn(exoid, blk_id, "element edge", connid, elem_edge_conn);
      if (status != NC_NOERR) {
        EX_FUNC_LEAVE(EX_FATAL);
      }
    }

    if (num_fa_per_elem != 0) {
      status = nc_inq_varid(exoid, VAR_FCONN(blk_id_ndx), &connid);
      if (status != NC_NOERR) {
        snprintf(errmsg, MAX_ERR_LENGTH,
                 "ERROR: failed to locate connectivity array for "
                 "element face block %" PRId64 " in file id %d",
                 blk_id, exoid);
        ex_err_fn(exoid, __func__, errmsg, status);
        EX_FUNC_LEAVE(EX_FATAL);
      }
      status = ex_int_write_conn(exoid, blk_id, "element face", connid, elem_face_conn);
      if (status != NC_NOERR) {
        EX_FUNC_LEAVE(EX_FATAL);
      }
    }
  }

  EX_FUNC_LEAVE(EX_NOERR);
}
