#pragma once

/* Index sets for scatter-gather type operations in vectors and matrices. */

#include <petscis.h>
#include <petsc/private/petscimpl.h>

PETSC_INTERN PetscBool ISRegisterAllCalled;
PETSC_INTERN PetscBool ISLocalToGlobalMappingRegisterAllCalled;

PETSC_EXTERN PetscLogEvent IS_View;
PETSC_EXTERN PetscLogEvent IS_Load;

struct _ISOps {
  PetscErrorCode (*getindices)(IS, const PetscInt *[]);
  PetscErrorCode (*restoreindices)(IS, const PetscInt *[]);
  PetscErrorCode (*invertpermutation)(IS, PetscInt, IS *);
  PetscErrorCode (*sort)(IS);
  PetscErrorCode (*sortremovedups)(IS);
  PetscErrorCode (*sorted)(IS, PetscBool *);
  PetscErrorCode (*duplicate)(IS, IS *);
  PetscErrorCode (*destroy)(IS);
  PetscErrorCode (*view)(IS, PetscViewer);
  PetscErrorCode (*load)(IS, PetscViewer);
  PetscErrorCode (*copy)(IS, IS);
  PetscErrorCode (*togeneral)(IS);
  PetscErrorCode (*oncomm)(IS, MPI_Comm, PetscCopyMode, IS *);
  PetscErrorCode (*setblocksize)(IS, PetscInt);
  PetscErrorCode (*contiguous)(IS, PetscInt, PetscInt, PetscInt *, PetscBool *);
  PetscErrorCode (*locate)(IS, PetscInt, PetscInt *);
  PetscErrorCode (*sortedlocal)(IS, PetscBool *);
  PetscErrorCode (*sortedglobal)(IS, PetscBool *);
  PetscErrorCode (*uniquelocal)(IS, PetscBool *);
  PetscErrorCode (*uniqueglobal)(IS, PetscBool *);
  PetscErrorCode (*permlocal)(IS, PetscBool *);
  PetscErrorCode (*permglobal)(IS, PetscBool *);
  PetscErrorCode (*intervallocal)(IS, PetscBool *);
  PetscErrorCode (*intervalglobal)(IS, PetscBool *);
};

typedef enum {
  IS_INFO_UNKNOWN = 0,
  IS_INFO_FALSE   = 1,
  IS_INFO_TRUE    = 2
} ISInfoBool;

struct _p_IS {
  PETSCHEADER(struct _ISOps);
  PetscLayout map;
  PetscInt    max, min; /* range of possible values */
  void       *data;
  PetscInt   *total, *nonlocal;               /* local representation of ALL indices across the comm as well as the nonlocal part. */
  PetscInt    local_offset;                   /* offset to the local part within the total index set */
  IS          complement;                     /* IS wrapping nonlocal indices. */
  PetscBool   info_permanent[2][IS_INFO_MAX]; /* whether local / global properties are permanent */
  ISInfoBool  info[2][IS_INFO_MAX];           /* local / global properties */
};

PETSC_INTERN PetscErrorCode ISView_Binary(IS, PetscViewer);
PETSC_INTERN PetscErrorCode ISLoad_Default(IS, PetscViewer);

struct _ISLocalToGlobalMappingOps {
  PetscErrorCode (*globaltolocalmappingsetup)(ISLocalToGlobalMapping);
  PetscErrorCode (*globaltolocalmappingapply)(ISLocalToGlobalMapping, ISGlobalToLocalMappingMode, PetscInt, const PetscInt[], PetscInt *, PetscInt[]);
  PetscErrorCode (*globaltolocalmappingapplyblock)(ISLocalToGlobalMapping, ISGlobalToLocalMappingMode, PetscInt, const PetscInt[], PetscInt *, PetscInt[]);
  PetscErrorCode (*destroy)(ISLocalToGlobalMapping);
};

struct _p_ISLocalToGlobalMapping {
  PETSCHEADER(struct _ISLocalToGlobalMappingOps);
  PetscInt   n;               /* number of local indices */
  PetscInt   bs;              /* blocksize; there is one index per block */
  PetscInt  *indices;         /* global index of each local index */
  PetscBool  dealloc_indices; /* should indices be deallocated? */
  PetscInt   globalstart;     /* first global referenced in indices */
  PetscInt   globalend;       /* last + 1 global referenced in indices */
  PetscBool  info_cached;     /* reuse GetInfo */
  PetscBool  info_free;
  PetscInt   info_nproc;
  PetscInt  *info_procs;
  PetscInt  *info_numprocs;
  PetscInt **info_indices;
  PetscInt  *info_nodec;
  PetscInt **info_nodei;
  void      *data; /* type specific data is stored here */
};

struct _n_ISColoring {
  PetscInt         refct;
  PetscInt         n;  /* number of colors */
  IS              *is; /* for each color indicates columns */
  MPI_Comm         comm;
  ISColoringValue *colors; /* for each column indicates color */
  PetscInt         N;      /* number of columns */
  ISColoringType   ctype;
  PetscBool        allocated;
};
