// Copyright (c) 2017-2022, Lawrence Livermore National Security, LLC and other CEED contributors.
// All Rights Reserved. See the top-level LICENSE and NOTICE files for details.
//
// SPDX-License-Identifier: BSD-2-Clause
//
// This file is part of CEED:  http://github.com/ceed

#include <ceed/ceed.h>
#include <ceed/backend.h>
#include <string.h>
#include "ceed-poisson1dapply.h"

/**
  @brief Set fields for Ceed QFunction applying the 1D Poisson operator
**/
static int CeedQFunctionInit_Poisson1DApply(Ceed ceed, const char *requested,
    CeedQFunction qf) {
  int ierr;

  // Check QFunction name
  const char *name = "Poisson1DApply";
  if (strcmp(name, requested))
    // LCOV_EXCL_START
    return CeedError(ceed, CEED_ERROR_UNSUPPORTED,
                     "QFunction '%s' does not match requested name: %s",
                     name, requested);
  // LCOV_EXCL_STOP

  // Add QFunction fields
  const CeedInt dim = 1;
  ierr = CeedQFunctionAddInput(qf, "du", dim, CEED_EVAL_GRAD); CeedChk(ierr);
  ierr = CeedQFunctionAddInput(qf, "qdata", dim*(dim+1)/2, CEED_EVAL_NONE);
  CeedChk(ierr);
  ierr = CeedQFunctionAddOutput(qf, "dv", dim, CEED_EVAL_GRAD); CeedChk(ierr);

  ierr = CeedQFunctionSetUserFlopsEstimate(qf, 1); CeedChk(ierr);

  return CEED_ERROR_SUCCESS;
}

/**
  @brief Register Ceed QFunction for applying the 1D Poisson operator
**/
CEED_INTERN int CeedQFunctionRegister_Poisson1DApply(void) {
  return CeedQFunctionRegister("Poisson1DApply", Poisson1DApply_loc, 1,
                               Poisson1DApply, CeedQFunctionInit_Poisson1DApply);
}