/* -----------------------------------------------------------------
 * Programmer(s): Daniel R. Reynolds @ SMU
 * -----------------------------------------------------------------
 * SUNDIALS Copyright Start
 * Copyright (c) 2002-2022, 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 main header file for the "MPIManyVector" implementation
 * of the NVECTOR module.
 *
 * Notes:
 *
 *   - The definition of the generic N_Vector structure can be found
 *     in the header file sundials_nvector.h.
 *
 *   - The definitions of the types 'realtype' and 'sunindextype' can
 *     be found in the header file sundials_types.h, and it may be
 *     changed (at the configuration stage) according to the user's needs.
 *     The sundials_types.h file also contains the definition
 *     for the type 'booleantype'.
 *
 *   - N_Vector arguments to arithmetic vector operations need not
 *     be distinct. For example, the following call:
 *
 *       N_VLinearSum_MPIManyVector(a,x,b,y,y);
 *
 *     (which stores the result of the operation a*x+b*y in y)
 *     is legal.
 * -----------------------------------------------------------------*/

#ifndef _NVECTOR_MPI_MANY_VECTOR_H
#define _NVECTOR_MPI_MANY_VECTOR_H

#include <mpi.h>
#include <sundials/sundials_mpi_types.h>
#include <stdio.h>
#include <sundials/sundials_nvector.h>

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

/* -----------------------------------------------------------------
   ManyVector implementation of N_Vector
   ----------------------------------------------------------------- */

struct _N_VectorContent_MPIManyVector {
  MPI_Comm      comm;            /* overall MPI communicator        */
  sunindextype  num_subvectors;  /* number of vectors attached       */
  sunindextype  global_length;   /* overall global manyvector length */
  N_Vector*     subvec_array;    /* pointer to N_Vector array        */
  booleantype   own_data;        /* flag indicating data ownership   */
};

typedef struct _N_VectorContent_MPIManyVector *N_VectorContent_MPIManyVector;

/* -----------------------------------------------------------------
   functions exported by ManyVector
   ----------------------------------------------------------------- */

SUNDIALS_EXPORT N_Vector N_VMake_MPIManyVector(MPI_Comm comm,
                                               sunindextype num_subvectors,
                                               N_Vector *vec_array,
                                               SUNContext sunctx);

SUNDIALS_EXPORT N_Vector N_VNew_MPIManyVector(sunindextype num_subvectors,
                                              N_Vector *vec_array,
                                              SUNContext sunctx);

SUNDIALS_EXPORT N_Vector N_VGetSubvector_MPIManyVector(N_Vector v,
                                                       sunindextype vec_num);

SUNDIALS_EXPORT realtype *N_VGetSubvectorArrayPointer_MPIManyVector(N_Vector v,
                                                                    sunindextype vec_num);

SUNDIALS_EXPORT int N_VSetSubvectorArrayPointer_MPIManyVector(realtype *v_data, N_Vector v,
                                                              sunindextype vec_num);

SUNDIALS_EXPORT sunindextype N_VGetNumSubvectors_MPIManyVector(N_Vector v);

/* standard vector operations */
SUNDIALS_EXPORT N_Vector_ID N_VGetVectorID_MPIManyVector(N_Vector v);
SUNDIALS_EXPORT void N_VPrint_MPIManyVector(N_Vector v);
SUNDIALS_EXPORT void N_VPrintFile_MPIManyVector(N_Vector v, FILE *outfile);
SUNDIALS_EXPORT N_Vector N_VCloneEmpty_MPIManyVector(N_Vector w);
SUNDIALS_EXPORT N_Vector N_VClone_MPIManyVector(N_Vector w);
SUNDIALS_EXPORT void N_VDestroy_MPIManyVector(N_Vector v);
SUNDIALS_EXPORT void N_VSpace_MPIManyVector(N_Vector v, sunindextype *lrw,
                                            sunindextype *liw);
SUNDIALS_EXPORT void *N_VGetCommunicator_MPIManyVector(N_Vector v);
SUNDIALS_EXPORT sunindextype N_VGetLength_MPIManyVector(N_Vector v);
SUNDIALS_EXPORT sunindextype N_VGetSubvectorLocalLength_MPIManyVector(N_Vector v, sunindextype vec_num);
SUNDIALS_EXPORT void N_VLinearSum_MPIManyVector(realtype a, N_Vector x,
                                                realtype b, N_Vector y,
                                                N_Vector z);
SUNDIALS_EXPORT void N_VConst_MPIManyVector(realtype c, N_Vector z);
SUNDIALS_EXPORT void N_VProd_MPIManyVector(N_Vector x, N_Vector y, N_Vector z);
SUNDIALS_EXPORT void N_VDiv_MPIManyVector(N_Vector x, N_Vector y, N_Vector z);
SUNDIALS_EXPORT void N_VScale_MPIManyVector(realtype c, N_Vector x, N_Vector z);
SUNDIALS_EXPORT void N_VAbs_MPIManyVector(N_Vector x, N_Vector z);
SUNDIALS_EXPORT void N_VInv_MPIManyVector(N_Vector x, N_Vector z);
SUNDIALS_EXPORT void N_VAddConst_MPIManyVector(N_Vector x, realtype b,
                                               N_Vector z);
SUNDIALS_EXPORT realtype N_VDotProd_MPIManyVector(N_Vector x, N_Vector y);
SUNDIALS_EXPORT realtype N_VMaxNorm_MPIManyVector(N_Vector x);
SUNDIALS_EXPORT realtype N_VWrmsNorm_MPIManyVector(N_Vector x, N_Vector w);
SUNDIALS_EXPORT realtype N_VWrmsNormMask_MPIManyVector(N_Vector x, N_Vector w,
                                                       N_Vector id);
SUNDIALS_EXPORT realtype N_VMin_MPIManyVector(N_Vector x);
SUNDIALS_EXPORT realtype N_VWL2Norm_MPIManyVector(N_Vector x, N_Vector w);
SUNDIALS_EXPORT realtype N_VL1Norm_MPIManyVector(N_Vector x);
SUNDIALS_EXPORT void N_VCompare_MPIManyVector(realtype c, N_Vector x, N_Vector z);
SUNDIALS_EXPORT booleantype N_VInvTest_MPIManyVector(N_Vector x, N_Vector z);
SUNDIALS_EXPORT booleantype N_VConstrMask_MPIManyVector(N_Vector c, N_Vector x,
                                                        N_Vector m);
SUNDIALS_EXPORT realtype N_VMinQuotient_MPIManyVector(N_Vector num,
                                                      N_Vector denom);

/* fused vector operations */
SUNDIALS_EXPORT int N_VLinearCombination_MPIManyVector(int nvec, realtype* c,
                                                       N_Vector* V, N_Vector z);
SUNDIALS_EXPORT int N_VScaleAddMulti_MPIManyVector(int nvec, realtype* a,
                                                   N_Vector x, N_Vector* Y,
                                                   N_Vector* Z);
SUNDIALS_EXPORT int N_VDotProdMulti_MPIManyVector(int nvec, N_Vector x,
                                                  N_Vector *Y,
                                                  realtype* dotprods);

/* single buffer reduction operations */
SUNDIALS_EXPORT int N_VDotProdMultiLocal_MPIManyVector(int nvec, N_Vector x,
                                                       N_Vector *Y,
                                                       realtype* dotprods);
SUNDIALS_EXPORT int N_VDotProdMultiAllReduce_MPIManyVector(int nvec_total,
                                                           N_Vector x,
                                                           realtype* sum);

/* vector array operations */
SUNDIALS_EXPORT int N_VLinearSumVectorArray_MPIManyVector(int nvec,
                                                          realtype a, N_Vector* X,
                                                          realtype b, N_Vector* Y,
                                                          N_Vector* Z);
SUNDIALS_EXPORT int N_VScaleVectorArray_MPIManyVector(int nvec, realtype* c,
                                                      N_Vector* X, N_Vector* Z);
SUNDIALS_EXPORT int N_VConstVectorArray_MPIManyVector(int nvecs, realtype c,
                                                      N_Vector* Z);
SUNDIALS_EXPORT int N_VWrmsNormVectorArray_MPIManyVector(int nvecs, N_Vector* X,
                                                         N_Vector* W, realtype* nrm);
SUNDIALS_EXPORT int N_VWrmsNormMaskVectorArray_MPIManyVector(int nvec,
                                                             N_Vector* X,
                                                             N_Vector* W,
                                                             N_Vector id,
                                                             realtype* nrm);

/* OPTIONAL local reduction kernels (no parallel communication) */
SUNDIALS_EXPORT realtype N_VDotProdLocal_MPIManyVector(N_Vector x, N_Vector y);
SUNDIALS_EXPORT realtype N_VMaxNormLocal_MPIManyVector(N_Vector x);
SUNDIALS_EXPORT realtype N_VMinLocal_MPIManyVector(N_Vector x);
SUNDIALS_EXPORT realtype N_VL1NormLocal_MPIManyVector(N_Vector x);
SUNDIALS_EXPORT realtype N_VWSqrSumLocal_MPIManyVector(N_Vector x, N_Vector w);
SUNDIALS_EXPORT realtype N_VWSqrSumMaskLocal_MPIManyVector(N_Vector x, N_Vector w,
                                                           N_Vector id);
SUNDIALS_EXPORT booleantype N_VInvTestLocal_MPIManyVector(N_Vector x, N_Vector z);
SUNDIALS_EXPORT booleantype N_VConstrMaskLocal_MPIManyVector(N_Vector c, N_Vector x,
                                                             N_Vector m);
SUNDIALS_EXPORT realtype N_VMinQuotientLocal_MPIManyVector(N_Vector num,
                                                           N_Vector denom);

/* OPTIONAL XBraid interface operations */
SUNDIALS_EXPORT int N_VBufSize_MPIManyVector(N_Vector x, sunindextype *size);
SUNDIALS_EXPORT int N_VBufPack_MPIManyVector(N_Vector x, void *buf);
SUNDIALS_EXPORT int N_VBufUnpack_MPIManyVector(N_Vector x, void *buf);

/* -----------------------------------------------------------------
   Enable / disable fused vector operations
   ----------------------------------------------------------------- */

SUNDIALS_EXPORT int N_VEnableFusedOps_MPIManyVector(N_Vector v, booleantype tf);

SUNDIALS_EXPORT int N_VEnableLinearCombination_MPIManyVector(N_Vector v, booleantype tf);
SUNDIALS_EXPORT int N_VEnableScaleAddMulti_MPIManyVector(N_Vector v, booleantype tf);
SUNDIALS_EXPORT int N_VEnableDotProdMulti_MPIManyVector(N_Vector v, booleantype tf);

SUNDIALS_EXPORT int N_VEnableLinearSumVectorArray_MPIManyVector(N_Vector v, booleantype tf);
SUNDIALS_EXPORT int N_VEnableScaleVectorArray_MPIManyVector(N_Vector v, booleantype tf);
SUNDIALS_EXPORT int N_VEnableConstVectorArray_MPIManyVector(N_Vector v, booleantype tf);
SUNDIALS_EXPORT int N_VEnableWrmsNormVectorArray_MPIManyVector(N_Vector v, booleantype tf);
SUNDIALS_EXPORT int N_VEnableWrmsNormMaskVectorArray_MPIManyVector(N_Vector v, booleantype tf);

SUNDIALS_EXPORT int N_VEnableDotProdMultiLocal_MPIManyVector(N_Vector v, booleantype tf);

#ifdef __cplusplus
}
#endif
#endif
