// Copyright (c) 2017-2018, Lawrence Livermore National Security, LLC.
// Produced at the Lawrence Livermore National Laboratory. LLNL-CODE-734707.
// All Rights reserved. See files LICENSE and NOTICE for details.
//
// This file is part of CEED, a collection of benchmarks, miniapps, software
// libraries and APIs for efficient high-order finite element and spectral
// element discretizations for exascale applications. For more information and
// source code availability see http://github.com/ceed.
//
// The CEED research is supported by the Exascale Computing Project 17-SC-20-SC,
// a collaborative effort of two U.S. Department of Energy organizations (Office
// of Science and the National Nuclear Security Administration) responsible for
// the planning and preparation of a capable exascale ecosystem, including
// software, applications, hardware, advanced system engineering and early
// testbed platforms, in support of the nation's exascale computing imperative.

#include <ceed.h>
#include <ceed-backend.h>
#include <stdbool.h>
#include <string.h>
#include "ceed-cuda-shared.h"
#include "../cuda/ceed-cuda.h"

//------------------------------------------------------------------------------
// Backend init
//------------------------------------------------------------------------------
static int CeedInit_Cuda_shared(const char *resource, Ceed ceed) {
  int ierr;
  const int nrc = 9; // number of characters in resource
  if (strncmp(resource, "/gpu/cuda/shared", nrc))
    // LCOV_EXCL_START
    return CeedError(ceed, CEED_ERROR_BACKEND,
                     "Cuda backend cannot use resource: %s", resource);
  // LCOV_EXCL_STOP
  ierr = CeedSetDeterministic(ceed, true); CeedChk(ierr);

  Ceed ceedref;
  CeedInit("/gpu/cuda/ref", &ceedref);
  ierr = CeedSetDelegate(ceed, ceedref); CeedChk(ierr);

  Ceed_Cuda_shared *data;
  ierr = CeedCalloc(1, &data); CeedChk(ierr);
  ierr = CeedSetData(ceed, data); CeedChk(ierr);
  ierr = CeedCudaInit(ceed, resource, nrc); CeedChk(ierr);

  ierr = CeedSetBackendFunction(ceed, "Ceed", ceed, "BasisCreateTensorH1",
                                CeedBasisCreateTensorH1_Cuda_shared);
  CeedChk(ierr);
  ierr = CeedSetBackendFunction(ceed, "Ceed", ceed, "Destroy",
                                CeedDestroy_Cuda); CeedChk(ierr);
  CeedChk(ierr);
  return 0;
}

//------------------------------------------------------------------------------
// Register backend
//------------------------------------------------------------------------------
CEED_INTERN int CeedRegister_Cuda_Shared(void) {
  return CeedRegister("/gpu/cuda/shared", CeedInit_Cuda_shared, 25);
}
//------------------------------------------------------------------------------