/* -----------------------------------------------------------------
 * Programmer(s): Daniel Reynolds @ UMBC
 *                David J. Gardner, Carol S. Woodward, and
 *                Slaven Peles @ LLNL
 * -----------------------------------------------------------------
 * SUNDIALS Copyright Start
 * Copyright (c) 2025-2026, Lawrence Livermore National Security,
 * University of Maryland Baltimore County, and the SUNDIALS contributors.
 * Copyright (c) 2013-2025, Lawrence Livermore National Security
 * and Southern Methodist University.
 * Copyright (c) 2002-2013, Lawrence Livermore National Security.
 * All rights reserved.
 *
 * See the top-level LICENSE and NOTICE files for details.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 * SUNDIALS Copyright End
 * -----------------------------------------------------------------
 * This is the implementation file for a generic SUNMATRIX package.
 * It contains the implementation of the SUNMatrix operations listed
 * in sundials_matrix.h
 * -----------------------------------------------------------------*/

#include "sundials/sundials_matrix.h"

#include <stdlib.h>
#include <sundials/priv/sundials_errors_impl.h>
#include <sundials/sundials_core.h>

#include "sundials/sundials_errors.h"
#include "sundials/sundials_types.h"

#if defined(SUNDIALS_BUILD_WITH_PROFILING)
static SUNProfiler getSUNProfiler(SUNMatrix A) { return (A->sunctx->profiler); }
#endif

/* -----------------------------------------------------------------
 * Create a new empty SUNMatrix object
 * ----------------------------------------------------------------- */

SUNMatrix SUNMatNewEmpty(SUNContext sunctx)
{
  if (sunctx == NULL) { return NULL; }

  SUNFunctionBegin(sunctx);
  SUNMatrix A;
  SUNMatrix_Ops ops;

  /* create matrix object */
  A = NULL;
  A = (SUNMatrix)calloc(1, sizeof *A);
  SUNAssertNull(A, SUN_ERR_MALLOC_FAIL);

  /* create matrix ops structure */
  ops = NULL;
  ops = (SUNMatrix_Ops)calloc(1, sizeof *ops);
  SUNAssertNull(ops, SUN_ERR_MALLOC_FAIL);

  /* initialize operations to NULL */
  ops->getid                    = NULL;
  ops->clone                    = NULL;
  ops->destroy                  = NULL;
  ops->zero                     = NULL;
  ops->copy                     = NULL;
  ops->scaleadd                 = NULL;
  ops->scaleaddi                = NULL;
  ops->matvecsetup              = NULL;
  ops->matvec                   = NULL;
  ops->mathermitiantransposevec = NULL;
  ops->space                    = NULL;

  /* attach ops and initialize content to NULL */
  A->ops     = ops;
  A->content = NULL;
  A->sunctx  = sunctx;

  return (A);
}

/* -----------------------------------------------------------------
 * Free a generic SUNMatrix (assumes content is already empty)
 * ----------------------------------------------------------------- */

void SUNMatFreeEmpty(SUNMatrix A)
{
  if (A == NULL) { return; }

  /* free non-NULL ops structure */
  if (A->ops) { free(A->ops); }
  A->ops = NULL;

  /* free overall SUNMatrix object and return */
  free(A);
  return;
}

/* -----------------------------------------------------------------
 * Copy a matrix 'ops' structure
 * -----------------------------------------------------------------*/

SUNErrCode SUNMatCopyOps(SUNMatrix A, SUNMatrix B)
{
  SUNFunctionBegin(A->sunctx);
  /* Check that ops structures exist */
  SUNAssert(A && A->ops, SUN_ERR_ARG_CORRUPT);
  SUNAssert(B && B->ops, SUN_ERR_ARG_CORRUPT);

  /* Copy ops from A to B */
  B->ops->getid       = A->ops->getid;
  B->ops->clone       = A->ops->clone;
  B->ops->destroy     = A->ops->destroy;
  B->ops->zero        = A->ops->zero;
  B->ops->copy        = A->ops->copy;
  B->ops->scaleadd    = A->ops->scaleadd;
  B->ops->scaleaddi   = A->ops->scaleaddi;
  B->ops->matvecsetup = A->ops->matvecsetup;
  B->ops->matvec      = A->ops->matvec;
  B->ops->space       = A->ops->space;

  return (0);
}

/* -----------------------------------------------------------------
 * Functions in the 'ops' structure
 * ----------------------------------------------------------------- */

SUNMatrix_ID SUNMatGetID(SUNMatrix A)
{
  SUNMatrix_ID id;
  id = A->ops->getid(A);
  return (id);
}

SUNMatrix SUNMatClone(SUNMatrix A)
{
  SUNMatrix B = NULL;
  SUNDIALS_MARK_FUNCTION_BEGIN(getSUNProfiler(A));
  B         = A->ops->clone(A);
  B->sunctx = A->sunctx;
  SUNDIALS_MARK_FUNCTION_END(getSUNProfiler(A));
  return (B);
}

void SUNMatDestroy(SUNMatrix A)
{
  if (A == NULL) { return; }

  /* if the destroy operation exists use it */
  if (A->ops)
  {
    if (A->ops->destroy)
    {
      A->ops->destroy(A);
      return;
    }
  }

  /* if we reach this point, either ops == NULL or destroy == NULL,
     try to cleanup by freeing the content, ops, and matrix */
  if (A->content)
  {
    free(A->content);
    A->content = NULL;
  }
  if (A->ops)
  {
    free(A->ops);
    A->ops = NULL;
  }
  free(A);
  A = NULL;

  return;
}

SUNErrCode SUNMatZero(SUNMatrix A)
{
  SUNErrCode ier;
  SUNDIALS_MARK_FUNCTION_BEGIN(getSUNProfiler(A));
  ier = A->ops->zero(A);
  SUNDIALS_MARK_FUNCTION_END(getSUNProfiler(A));
  return (ier);
}

SUNErrCode SUNMatCopy(SUNMatrix A, SUNMatrix B)
{
  SUNErrCode ier;
  SUNDIALS_MARK_FUNCTION_BEGIN(getSUNProfiler(A));
  ier = A->ops->copy(A, B);
  SUNDIALS_MARK_FUNCTION_END(getSUNProfiler(A));
  return (ier);
}

SUNErrCode SUNMatScaleAdd(sunrealtype c, SUNMatrix A, SUNMatrix B)
{
  SUNErrCode ier;
  SUNDIALS_MARK_FUNCTION_BEGIN(getSUNProfiler(A));
  ier = A->ops->scaleadd(c, A, B);
  SUNDIALS_MARK_FUNCTION_END(getSUNProfiler(A));
  return (ier);
}

SUNErrCode SUNMatScaleAddI(sunrealtype c, SUNMatrix A)
{
  SUNErrCode ier;
  SUNDIALS_MARK_FUNCTION_BEGIN(getSUNProfiler(A));
  ier = A->ops->scaleaddi(c, A);
  SUNDIALS_MARK_FUNCTION_END(getSUNProfiler(A));
  return (ier);
}

SUNErrCode SUNMatMatvecSetup(SUNMatrix A)
{
  SUNErrCode ier = SUN_SUCCESS;
  SUNDIALS_MARK_FUNCTION_BEGIN(getSUNProfiler(A));
  if (A->ops->matvecsetup) { ier = A->ops->matvecsetup(A); }
  SUNDIALS_MARK_FUNCTION_END(getSUNProfiler(A));
  return (ier);
}

SUNErrCode SUNMatMatvec(SUNMatrix A, N_Vector x, N_Vector y)
{
  SUNErrCode ier;
  SUNDIALS_MARK_FUNCTION_BEGIN(getSUNProfiler(A));
  ier = A->ops->matvec(A, x, y);
  SUNDIALS_MARK_FUNCTION_END(getSUNProfiler(A));
  return (ier);
}

SUNErrCode SUNMatHermitianTransposeVec(SUNMatrix A, N_Vector x, N_Vector y)
{
  SUNErrCode ier;
  SUNDIALS_MARK_FUNCTION_BEGIN(getSUNProfiler(A));
  if (A->ops->mathermitiantransposevec)
  {
    ier = A->ops->mathermitiantransposevec(A, x, y);
  }
  else { ier = SUN_ERR_NOT_IMPLEMENTED; }
  SUNDIALS_MARK_FUNCTION_END(getSUNProfiler(A));
  return (ier);
}

SUNErrCode SUNMatSpace(SUNMatrix A, long int* lenrw, long int* leniw)
{
  SUNErrCode ier;
  SUNDIALS_MARK_FUNCTION_BEGIN(getSUNProfiler(A));
  ier = A->ops->space(A, lenrw, leniw);
  SUNDIALS_MARK_FUNCTION_END(getSUNProfiler(A));
  return (ier);
}
