#if !defined(__MPIAIJ_H)
#define __MPIAIJ_H

#include <../src/mat/impls/aij/seq/aij.h>

typedef struct { /* used by MatCreateMPIAIJSumSeqAIJ for reusing the merged matrix */
  PetscLayout rowmap;
  PetscInt    **buf_ri,**buf_rj;
  PetscMPIInt *len_s,*len_r,*id_r;    /* array of length of comm->size, store send/recv matrix values */
  PetscMPIInt nsend,nrecv;
  PetscInt    *bi,*bj;    /* i and j array of the local portion of mpi C (matrix product) - rename to ci, cj! */
  PetscInt    *owners_co,*coi,*coj;    /* i and j array of (p->B)^T*A*P - used in the communication */
  PetscErrorCode (*destroy)(Mat);
  PetscErrorCode (*duplicate)(Mat,MatDuplicateOption,Mat*);
} Mat_Merge_SeqsToMPI;

typedef struct { /* used by MatPtAP_MPIAIJ_MPIAIJ() and MatMatMult_MPIAIJ_MPIAIJ() */
  PetscInt    *startsj_s,*startsj_r;    /* used by MatGetBrowsOfAoCols_MPIAIJ */
  PetscScalar *bufa;                    /* used by MatGetBrowsOfAoCols_MPIAIJ */
  Mat         P_loc,P_oth;     /* partial B_seq -- intend to replace B_seq */
  PetscInt    *api,*apj;       /* symbolic i and j arrays of the local product A_loc*B_seq */
  PetscInt    rmax;            /* max num of nnz in a local row of the matrix product */
  MatReuse    reuse;           /* flag to skip MatGetBrowsOfAoCols_MPIAIJ() and MatMPIAIJGetLocalMat() in 1st call of MatPtAPNumeric_MPIAIJ_MPIAIJ() */
  PetscScalar *apa;            /* tmp array for store a row of A*P used in MatMatMult() */
  Mat         A_loc;           /* used by MatTransposeMatMult(), contains api and apj */
  Mat         Pt;              /* used by MatTransposeMatMult(), Pt = P^T */
  PetscBool   scalable;        /* flag determines scalable or non-scalable implementation */

  Mat_Merge_SeqsToMPI *merge;
  PetscErrorCode (*destroy)(Mat);
  PetscErrorCode (*duplicate)(Mat,MatDuplicateOption,Mat*);
} Mat_PtAPMPI;

typedef struct {
  Mat A,B;                             /* local submatrices: A (diag part),
                                           B (off-diag part) */
  PetscMPIInt size;                     /* size of communicator */
  PetscMPIInt rank;                     /* rank of proc in communicator */

  /* The following variables are used for matrix assembly */
  PetscBool   donotstash;               /* PETSC_TRUE if off processor entries dropped */
  MPI_Request *send_waits;              /* array of send requests */
  MPI_Request *recv_waits;              /* array of receive requests */
  PetscInt    nsends,nrecvs;           /* numbers of sends and receives */
  PetscScalar *svalues,*rvalues;       /* sending and receiving data */
  PetscInt    rmax;                     /* maximum message length */
#if defined(PETSC_USE_CTABLE)
  PetscTable colmap;
#else
  PetscInt *colmap;                     /* local col number of off-diag col */
#endif
  PetscInt *garray;                     /* global index of all off-processor columns */

  /* The following variables are used for matrix-vector products */
  Vec        lvec;                 /* local vector */
  Vec        diag;
  VecScatter Mvctx;                /* scatter context for vector */
  PetscBool  roworiented;          /* if true, row-oriented input, default true */

  /* The following variables are for MatGetRow() */
  PetscInt    *rowindices;         /* column indices for row */
  PetscScalar *rowvalues;          /* nonzero values in row */
  PetscBool   getrowactive;        /* indicates MatGetRow(), not restored */

  /* Used by MatDistribute_MPIAIJ() to allow reuse of previous matrix allocation  and nonzero pattern */
  PetscInt *ld;                    /* number of entries per row left of diagona block */

  /* Used by MatMatMult() and MatPtAP() */
  Mat_PtAPMPI *ptap;

  /* used by MatMatMatMult() */
  Mat_MatMatMatMult *matmatmatmult;

  /* Used by MPICUSP and MPICUSPARSE classes */
  void * spptr;
} Mat_MPIAIJ;

EXTERN_C_BEGIN
extern PetscErrorCode MatCreate_MPIAIJ(Mat);
EXTERN_C_END

extern PetscErrorCode MatSetColoring_MPIAIJ(Mat,ISColoring);
extern PetscErrorCode MatSetValuesAdifor_MPIAIJ(Mat,PetscInt,void*);
extern PetscErrorCode MatSetUpMultiply_MPIAIJ(Mat);
extern PetscErrorCode MatDisAssemble_MPIAIJ(Mat);
extern PetscErrorCode MatDuplicate_MPIAIJ(Mat,MatDuplicateOption,Mat*);
extern PetscErrorCode MatIncreaseOverlap_MPIAIJ(Mat,PetscInt,IS [],PetscInt);
extern PetscErrorCode MatFDColoringCreate_MPIAIJ(Mat,ISColoring,MatFDColoring);
extern PetscErrorCode MatGetSubMatrices_MPIAIJ (Mat,PetscInt,const IS[],const IS[],MatReuse,Mat *[]);
extern PetscErrorCode MatGetSubMatrix_MPIAIJ_All(Mat,MatGetSubMatrixOption,MatReuse,Mat *[]);
extern PetscErrorCode MatGetSubMatricesParallel_MPIAIJ (Mat,PetscInt,const IS[],const IS[],MatReuse,Mat *[]);

extern PetscErrorCode MatGetSubMatrix_MPIAIJ(Mat,IS,IS,MatReuse,Mat*);
extern PetscErrorCode MatGetSubMatrix_MPIAIJ_Private (Mat,IS,IS,PetscInt,MatReuse,Mat*);
extern PetscErrorCode MatGetMultiProcBlock_MPIAIJ(Mat,MPI_Comm,MatReuse,Mat*);

extern PetscErrorCode MatLoad_MPIAIJ(Mat,PetscViewer);
extern PetscErrorCode MatMatMult_MPIDense_MPIAIJ(Mat,Mat,MatReuse,PetscReal,Mat*);
extern PetscErrorCode MatMatMult_MPIAIJ_MPIAIJ(Mat,Mat,MatReuse,PetscReal,Mat*);
extern PetscErrorCode MatMatMultSymbolic_MPIAIJ_MPIAIJ(Mat,Mat,PetscReal,Mat*);
extern PetscErrorCode MatMatMultSymbolic_MPIAIJ_MPIAIJ_Scalable(Mat,Mat,PetscReal,Mat*);
extern PetscErrorCode MatMatMultNumeric_MPIAIJ_MPIAIJ(Mat,Mat,Mat);

extern PetscErrorCode MatMatMatMult_MPIAIJ_MPIAIJ_MPIAIJ(Mat,Mat,Mat,MatReuse,PetscReal,Mat*);
extern PetscErrorCode MatMatMatMultSymbolic_MPIAIJ_MPIAIJ_MPIAIJ(Mat,Mat,Mat,PetscReal,Mat*);
extern PetscErrorCode MatMatMatMultNumeric_MPIAIJ_MPIAIJ_MPIAIJ(Mat,Mat,Mat,Mat);

extern PetscErrorCode MatPtAP_MPIAIJ_MPIAIJ(Mat,Mat,MatReuse,PetscReal,Mat*);
extern PetscErrorCode MatPtAPSymbolic_MPIAIJ_MPIAIJ(Mat,Mat,PetscReal,Mat*);
extern PetscErrorCode MatPtAPNumeric_MPIAIJ_MPIAIJ(Mat,Mat,Mat);
extern PetscErrorCode MatPtAPSymbolic_MPIAIJ_MPIAIJ(Mat,Mat,PetscReal,Mat*);
extern PetscErrorCode MatPtAPNumeric_MPIAIJ_MPIAIJ(Mat,Mat,Mat);
extern PetscErrorCode MatDestroy_MPIAIJ_PtAP(Mat);
extern PetscErrorCode MatDestroy_MPIAIJ(Mat);

extern PetscErrorCode MatGetBrowsOfAoCols_MPIAIJ(Mat,Mat,MatReuse,PetscInt**,PetscInt**,MatScalar**,Mat*);
extern PetscErrorCode MatSetValues_MPIAIJ(Mat,PetscInt,const PetscInt[],PetscInt,const PetscInt[],const PetscScalar [],InsertMode);
extern PetscErrorCode MatDestroy_MPIAIJ_MatMatMult(Mat);
extern PetscErrorCode PetscContainerDestroy_Mat_MatMatMultMPI(void*);
extern PetscErrorCode MatSetOption_MPIAIJ(Mat,MatOption,PetscBool);

extern PetscErrorCode MatTransposeMatMult_MPIAIJ_MPIAIJ(Mat,Mat,MatReuse,PetscReal,Mat*);
extern PetscErrorCode MatTransposeMatMultSymbolic_MPIAIJ_MPIAIJ(Mat,Mat,PetscReal,Mat*);
extern PetscErrorCode MatTransposeMatMultSymbolic_MPIAIJ_MPIAIJ_Scalable(Mat,Mat,PetscReal,Mat*);
extern PetscErrorCode MatTransposeMatMultNumeric_MPIAIJ_MPIAIJ(Mat,Mat,Mat);

extern PetscErrorCode MatGetRedundantMatrix_MPIAIJ(Mat,PetscInt,MPI_Comm,PetscInt,MatReuse,Mat*);
extern PetscErrorCode MatGetSeqNonzeroStructure_MPIAIJ(Mat,Mat*);

EXTERN_C_BEGIN
extern PetscErrorCode MatMPIAIJSetPreallocation_MPIAIJ(Mat,PetscInt,const PetscInt[],PetscInt,const PetscInt[]);
EXTERN_C_END

#if !defined(PETSC_USE_COMPLEX) && !defined(PETSC_USE_REAL_SINGLE) && !defined(PETSC_USE_REAL___FLOAT128)
extern PetscErrorCode MatLUFactorSymbolic_MPIAIJ_TFS(Mat,IS,IS,const MatFactorInfo*,Mat*);
#endif
extern PetscErrorCode MatSolve_MPIAIJ(Mat,Vec,Vec);
extern PetscErrorCode MatILUFactor_MPIAIJ(Mat,IS,IS,const MatFactorInfo*);

EXTERN_C_BEGIN
extern PetscErrorCode MatGetDiagonalBlock_MPIAIJ(Mat,Mat*);
extern PetscErrorCode MatDiagonalScaleLocal_MPIAIJ(Mat,Vec);
EXTERN_C_END

#endif