#include <petsc/private/viewerimpl.h> /*I   "petscsys.h"   I*/
#include <adios.h>
#include <adios_read.h>

#include <petsc/private/vieweradiosimpl.h>

static PetscErrorCode PetscViewerSetFromOptions_ADIOS(PetscViewer v, PetscOptionItems *PetscOptionsObject) {
  PetscFunctionBegin;
  PetscOptionsHeadBegin(PetscOptionsObject, "ADIOS PetscViewer Options");
  PetscOptionsHeadEnd();
  PetscFunctionReturn(0);
}

static PetscErrorCode PetscViewerFileClose_ADIOS(PetscViewer viewer) {
  PetscViewer_ADIOS *adios = (PetscViewer_ADIOS *)viewer->data;

  PetscFunctionBegin;
  switch (adios->btype) {
  case FILE_MODE_READ: PetscCall(adios_read_close(adios->adios_fp)); break;
  case FILE_MODE_WRITE: PetscCall(adios_close(adios->adios_handle)); break;
  default: break;
  }
  PetscCall(PetscFree(adios->filename));
  PetscFunctionReturn(0);
}

PetscErrorCode PetscViewerDestroy_ADIOS(PetscViewer viewer) {
  PetscViewer_ADIOS *adios = (PetscViewer_ADIOS *)viewer->data;

  PetscFunctionBegin;
  PetscCall(PetscViewerFileClose_ADIOS(viewer));
  PetscCall(PetscFree(adios));
  PetscCall(PetscObjectComposeFunction((PetscObject)viewer, "PetscViewerFileSetName_C", NULL));
  PetscCall(PetscObjectComposeFunction((PetscObject)viewer, "PetscViewerFileGetName_C", NULL));
  PetscCall(PetscObjectComposeFunction((PetscObject)viewer, "PetscViewerFileSetMode_C", NULL));
  PetscFunctionReturn(0);
}

PetscErrorCode PetscViewerFileSetMode_ADIOS(PetscViewer viewer, PetscFileMode type) {
  PetscViewer_ADIOS *adios = (PetscViewer_ADIOS *)viewer->data;

  PetscFunctionBegin;
  adios->btype = type;
  PetscFunctionReturn(0);
}

PetscErrorCode PetscViewerFileSetName_ADIOS(PetscViewer viewer, const char name[]) {
  PetscViewer_ADIOS *adios = (PetscViewer_ADIOS *)viewer->data;

  PetscFunctionBegin;
  if (adios->filename) PetscCall(PetscFree(adios->filename));
  PetscCall(PetscStrallocpy(name, &adios->filename));
  /* Create or open the file collectively */
  switch (adios->btype) {
  case FILE_MODE_READ: adios->adios_fp = adios_read_open_file(adios->filename, ADIOS_READ_METHOD_BP, PetscObjectComm((PetscObject)viewer)); break;
  case FILE_MODE_WRITE: adios_open(&adios->adios_handle, "PETSc", adios->filename, "w", PetscObjectComm((PetscObject)viewer)); break;
  case FILE_MODE_UNDEFINED: SETERRQ(PetscObjectComm((PetscObject)viewer), PETSC_ERR_ORDER, "Must call PetscViewerFileSetMode() before PetscViewerFileSetName()");
  default: SETERRQ(PetscObjectComm((PetscObject)viewer), PETSC_ERR_SUP, "Unsupported file mode %s", PetscFileModes[adios->btype]);
  }
  PetscFunctionReturn(0);
}

static PetscErrorCode PetscViewerFileGetName_ADIOS(PetscViewer viewer, const char **name) {
  PetscViewer_ADIOS *vadios = (PetscViewer_ADIOS *)viewer->data;

  PetscFunctionBegin;
  *name = vadios->filename;
  PetscFunctionReturn(0);
}

/*MC
   PETSCVIEWERADIOS - A viewer that writes to an ADIOS file

.seealso: `PetscViewerADIOSOpen()`, `PetscViewerStringSPrintf()`, `PetscViewerSocketOpen()`, `PetscViewerDrawOpen()`, `PETSCVIEWERSOCKET`,
          `PetscViewerCreate()`, `PetscViewerASCIIOpen()`, `PetscViewerBinaryOpen()`, `PETSCVIEWERBINARY`, `PETSCVIEWERDRAW`, `PETSCVIEWERSTRING`,
          `PetscViewerMatlabOpen()`, `VecView()`, `DMView()`, `PetscViewerMatlabPutArray()`, `PETSCVIEWERASCII`, `PETSCVIEWERMATLAB`,
          `PetscViewerFileSetName()`, `PetscViewerFileSetMode()`, `PetscViewerFormat`, `PetscViewerType`, `PetscViewerSetType()`

  Level: beginner
M*/

PETSC_EXTERN PetscErrorCode PetscViewerCreate_ADIOS(PetscViewer v) {
  PetscViewer_ADIOS *adios;

  PetscFunctionBegin;
  PetscCall(PetscNewLog(v, &adios));

  v->data                = (void *)adios;
  v->ops->destroy        = PetscViewerDestroy_ADIOS;
  v->ops->setfromoptions = PetscViewerSetFromOptions_ADIOS;
  v->ops->flush          = NULL;
  adios->btype           = FILE_MODE_UNDEFINED;
  adios->filename        = NULL;
  adios->timestep        = -1;

  PetscCall(PetscObjectComposeFunction((PetscObject)v, "PetscViewerFileSetName_C", PetscViewerFileSetName_ADIOS));
  PetscCall(PetscObjectComposeFunction((PetscObject)v, "PetscViewerFileGetName_C", PetscViewerFileGetName_ADIOS));
  PetscCall(PetscObjectComposeFunction((PetscObject)v, "PetscViewerFileSetMode_C", PetscViewerFileSetMode_ADIOS));
  PetscFunctionReturn(0);
}

/*@C
   PetscViewerADIOSOpen - Opens a file for ADIOS input/output.

   Collective

   Input Parameters:
+  comm - MPI communicator
.  name - name of file
-  type - type of file
$    FILE_MODE_WRITE - create new file for binary output
$    FILE_MODE_READ - open existing file for binary input
$    FILE_MODE_APPEND - open existing file for binary output

   Output Parameter:
.  adiosv - PetscViewer for ADIOS input/output to use with the specified file

   Level: beginner

   Note:
   This PetscViewer should be destroyed with PetscViewerDestroy().

.seealso: `PetscViewerASCIIOpen()`, `PetscViewerPushFormat()`, `PetscViewerDestroy()`, `PetscViewerHDF5Open()`,
          `VecView()`, `MatView()`, `VecLoad()`, `PetscViewerSetType()`, `PetscViewerFileSetMode()`, `PetscViewerFileSetName()`
          `MatLoad()`, `PetscFileMode`, `PetscViewer`
@*/
PetscErrorCode PetscViewerADIOSOpen(MPI_Comm comm, const char name[], PetscFileMode type, PetscViewer *adiosv) {
  PetscFunctionBegin;
  PetscCall(PetscViewerCreate(comm, adiosv));
  PetscCall(PetscViewerSetType(*adiosv, PETSCVIEWERADIOS));
  PetscCall(PetscViewerFileSetMode(*adiosv, type));
  PetscCall(PetscViewerFileSetName(*adiosv, name));
  PetscFunctionReturn(0);
}

/*@C
  PetscDataTypeToADIOSDataType - Converts the PETSc name of a datatype to its ADIOS name.

  Not collective

  Input Parameter:
. ptype - the PETSc datatype name (for example PETSC_DOUBLE)

  Output Parameter:
. mtype - the MPI datatype (for example MPI_DOUBLE, ...)

  Level: advanced

  Developer Notes: These have not been verified

.seealso: `PetscDataType`, `PetscADIOSDataTypeToPetscDataType()`
@*/
PetscErrorCode PetscDataTypeToADIOSDataType(PetscDataType ptype, enum ADIOS_DATATYPES *htype) {
  PetscFunctionBegin;
  if (ptype == PETSC_INT)
#if defined(PETSC_USE_64BIT_INDICES)
    *htype = adios_long;
#else
    *htype = adios_integer;
#endif
  else if (ptype == PETSC_ENUM) *htype = adios_integer;
  else if (ptype == PETSC_DOUBLE) *htype = adios_double;
  else if (ptype == PETSC_LONG) *htype = adios_long;
  else if (ptype == PETSC_SHORT) *htype = adios_short;
  else if (ptype == PETSC_FLOAT) *htype = adios_real;
  else if (ptype == PETSC_CHAR) *htype = adios_string_array;
  else if (ptype == PETSC_STRING) *htype = adios_string;
  else SETERRQ(PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "Unsupported PETSc datatype");
  PetscFunctionReturn(0);
}

/*@C
  PetscADIOSDataTypeToPetscDataType - Finds the PETSc name of a datatype from its ADIOS name

  Not collective

  Input Parameter:
. htype - the ADIOS datatype (for example H5T_NATIVE_DOUBLE, ...)

  Output Parameter:
. ptype - the PETSc datatype name (for example PETSC_DOUBLE)

  Level: advanced

  Developer Notes: These have not been verified

.seealso: `PetscDataType`, `PetscADIOSDataTypeToPetscDataType()`
@*/
PetscErrorCode PetscADIOSDataTypeToPetscDataType(enum ADIOS_DATATYPES htype, PetscDataType *ptype) {
  PetscFunctionBegin;
#if defined(PETSC_USE_64BIT_INDICES)
  if (htype == adios_integer) *ptype = PETSC_ENUM;
  else if (htype == adios_long) *ptype = PETSC_INT;
#else
  if (htype == adios_integer) *ptype = PETSC_INT;
#endif
  else if (htype == adios_double) *ptype = PETSC_DOUBLE;
  else if (htype == adios_long) *ptype = PETSC_LONG;
  else if (htype == adios_short) *ptype = PETSC_SHORT;
  else if (htype == adios_real) *ptype = PETSC_FLOAT;
  else if (htype == adios_string_array) *ptype = PETSC_CHAR;
  else if (htype == adios_string) *ptype = PETSC_STRING;
  else SETERRQ(PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "Unsupported ADIOS datatype");
  PetscFunctionReturn(0);
}