/*
 * -----------------------------------------------------------------
 * Programmer(s): Daniel Reynolds @ SMU
 * -----------------------------------------------------------------
 * SUNDIALS Copyright Start
 * Copyright (c) 2002-2019, Lawrence Livermore National Security
 * and Southern Methodist University.
 * 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 header file for the LAPACK band implementation of the
 * SUNLINSOL module, SUNLINSOL_LAPACKBAND.
 *
 * Note:
 *   - The definition of the generic SUNLinearSolver structure can
 *     be found in the header file sundials_linearsolver.h.
 * -----------------------------------------------------------------
 */

#ifndef _SUNLINSOL_LAPBAND_H
#define _SUNLINSOL_LAPBAND_H

#include <sundials/sundials_linearsolver.h>
#include <sundials/sundials_lapack.h>
#include <sundials/sundials_matrix.h>
#include <sundials/sundials_nvector.h>
#include <sunmatrix/sunmatrix_band.h>

#ifdef __cplusplus  /* wrapper to enable C++ usage */
extern "C" {
#endif

/* Interfaces to match 'realtype' with the correct LAPACK functions */
#if defined(SUNDIALS_DOUBLE_PRECISION)
#define xgbtrf_f77    dgbtrf_f77
#define xgbtrs_f77    dgbtrs_f77
#elif defined(SUNDIALS_SINGLE_PRECISION)
#define xgbtrf_f77    sgbtrf_f77
#define xgbtrs_f77    sgbtrs_f77
#else
#error  Incompatible realtype for LAPACK; disable LAPACK and rebuild
#endif

/* Catch to disable LAPACK linear solvers with incompatible sunindextype */
#if defined(SUNDIALS_INT32_T)
#else  /* incompatible sunindextype for LAPACK */
#error  Incompatible sunindextype for LAPACK; disable LAPACK and rebuild
#endif

/* ----------------------------------------------
 * LAPACK band implementation of SUNLinearSolver
 * ---------------------------------------------- */

struct _SUNLinearSolverContent_LapackBand {
  sunindextype N;
  sunindextype *pivots;
  sunindextype last_flag;
};

typedef struct _SUNLinearSolverContent_LapackBand *SUNLinearSolverContent_LapackBand;


/* --------------------------------------------
 * Exported Functions for SUNLINSOL_LAPACKBAND
 * -------------------------------------------- */

SUNDIALS_EXPORT SUNLinearSolver SUNLinSol_LapackBand(N_Vector y,
                                                     SUNMatrix A);

/* deprecated */
SUNDIALS_EXPORT SUNLinearSolver SUNLapackBand(N_Vector y, SUNMatrix A);

SUNDIALS_EXPORT SUNLinearSolver_Type SUNLinSolGetType_LapackBand(SUNLinearSolver S);
SUNDIALS_EXPORT SUNLinearSolver_ID SUNLinSolGetID_LapackBand(SUNLinearSolver S);
SUNDIALS_EXPORT int SUNLinSolInitialize_LapackBand(SUNLinearSolver S);
SUNDIALS_EXPORT int SUNLinSolSetup_LapackBand(SUNLinearSolver S, SUNMatrix A);
SUNDIALS_EXPORT int SUNLinSolSolve_LapackBand(SUNLinearSolver S, SUNMatrix A,
                                              N_Vector x, N_Vector b, realtype tol);
SUNDIALS_EXPORT sunindextype SUNLinSolLastFlag_LapackBand(SUNLinearSolver S);
SUNDIALS_EXPORT int SUNLinSolSpace_LapackBand(SUNLinearSolver S,
                                              long int *lenrwLS,
                                              long int *leniwLS);
SUNDIALS_EXPORT int SUNLinSolFree_LapackBand(SUNLinearSolver S);

#ifdef __cplusplus
}
#endif

#endif
