#include <petsc/private/petscimpl.h> /*I  "petscsys.h"   I*/

#if defined(PETSC_USE_DEBUG) && !defined(PETSC_HAVE_THREADSAFETY)
PetscStack petscstack;
#endif

#if defined(PETSC_HAVE_SAWS)
  #include <petscviewersaws.h>

static PetscBool amsmemstack = PETSC_FALSE;

/*@C
  PetscStackSAWsGrantAccess - Grants access of the PETSc stack frames to the SAWs publisher

  Collective on `PETSC_COMM_WORLD`?

  Level: developer

  Developer Notes:
  Cannot use `PetscFunctionBegin`/`PetrscFunctionReturn()` or `PetscCallSAWs()` since it may be
  used within those routines

.seealso: `PetscObjectSetName()`, `PetscObjectSAWsViewOff()`, `PetscObjectSAWsTakeAccess()`
@*/
void PetscStackSAWsGrantAccess(void)
{
  if (amsmemstack) {
    /* ignore any errors from SAWs */
    SAWs_Unlock();
  }
}

/*@C
  PetscStackSAWsTakeAccess - Takes access of the PETSc stack frames from the SAWs publisher

  Collective on `PETSC_COMM_WORLD`?

  Level: developer

  Developer Notes:
  Cannot use `PetscFunctionBegin`/`PetscFunctionReturn()` or `PetscCallSAWs()` since it may be
  used within those routines

.seealso: `PetscObjectSetName()`, `PetscObjectSAWsViewOff()`, `PetscObjectSAWsGrantAccess()`
@*/
void PetscStackSAWsTakeAccess(void)
{
  if (amsmemstack) {
    /* ignore any errors from SAWs */
    SAWs_Lock();
  }
}

PetscErrorCode PetscStackViewSAWs(void)
{
  PetscMPIInt rank;

  PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
  if (rank) return PETSC_SUCCESS;
  #if PetscDefined(USE_DEBUG)
  PetscCallSAWs(SAWs_Register, ("/PETSc/Stack/functions", petscstack.function, 20, SAWs_READ, SAWs_STRING));
  PetscCallSAWs(SAWs_Register, ("/PETSc/Stack/__current_size", &petscstack.currentsize, 1, SAWs_READ, SAWs_INT));
  #endif
  amsmemstack = PETSC_TRUE;
  return PETSC_SUCCESS;
}

PetscErrorCode PetscStackSAWsViewOff(void)
{
  PetscFunctionBegin;
  if (!amsmemstack) PetscFunctionReturn(PETSC_SUCCESS);
  PetscCallSAWs(SAWs_Delete, ("/PETSc/Stack"));
  amsmemstack = PETSC_FALSE;
  PetscFunctionReturn(PETSC_SUCCESS);
}
#endif /* PETSC_HAVE_SAWS */

#if PetscDefined(USE_DEBUG) && !PetscDefined(HAVE_THREADSAFETY)
PetscErrorCode PetscStackSetCheck(PetscBool check)
{
  petscstack.check = check;
  return PETSC_SUCCESS;
}

PetscErrorCode PetscStackReset(void)
{
  memset(&petscstack, 0, sizeof(petscstack));
  return PETSC_SUCCESS;
}

/*
  PetscStackView - Print the current (default) PETSc stack to an ASCII file

  Not Collective

  Input Parameter:
. file - the file pointer, or `NULL` to use `PETSC_STDOUT`

  Level: developer

  Notes:
  In debug mode PETSc maintains a stack of the current function calls that can be used to help
  to quickly see where a problem has occurred, for example, when a signal is received. It is
  recommended to use the debugger if extensive information is needed to help debug the problem.

  The default stack is a global variable called `petscstack`.

.seealso: `PetscAttachDebugger()`, `PetscStackCopy()`, `PetscStackPrint()`, `PetscStackSAWsGrantAccess()`, `PetscStackSAWsTakeAccess()`
*/
PetscErrorCode PetscStackView(FILE *file)
{
  if (!file) file = PETSC_STDOUT;
  if (petscstack.currentsize < 0) {
    /* < 0 is absolutely a corrupted stack, but this function is usually called in an error
     * handler, which are not capable of recovering from errors so best we can do is print
     * this warning */
    fprintf(file, "PetscStack is definitely corrupted with stack size %d\n", petscstack.currentsize);
  } else if (petscstack.currentsize == 0) {
    if (file == PETSC_STDOUT) {
      PetscCall((*PetscErrorPrintf)("No error traceback is available, the problem could be in the main program. \n"));
    } else {
      fprintf(file, "No error traceback is available, the problem could be in the main program. \n");
    }
  } else {
    char *ptr = NULL;

    if (file == PETSC_STDOUT) {
      PetscCall((*PetscErrorPrintf)("The line numbers in the error traceback are not always exact.\n"));
      for (int i = petscstack.currentsize - 1, j = 1; i >= 0; --i, ++j) {
        if (petscstack.file[i]) PetscCall((*PetscErrorPrintf)("#%d %s() at %s:%d\n", j, petscstack.function[i], PetscCIFilename(petscstack.file[i]), PetscCILinenumber(petscstack.line[i])));
        else {
          PetscCall(PetscStrstr(petscstack.function[i], " ", &ptr));
          if (!ptr) PetscCall((*PetscErrorPrintf)("#%d %s()\n", j, petscstack.function[i]));
          else PetscCall((*PetscErrorPrintf)("#%d %s\n", j, petscstack.function[i]));
        }
      }
    } else {
      fprintf(file, "The line numbers in the error traceback are not always exact.\n");
      for (int i = petscstack.currentsize - 1, j = 1; i >= 0; --i, ++j) {
        if (petscstack.file[i]) fprintf(file, "[%d] #%d %s() at %s:%d\n", PetscGlobalRank, j, petscstack.function[i], PetscCIFilename(petscstack.file[i]), PetscCILinenumber(petscstack.line[i]));
        else {
          PetscCall(PetscStrstr(petscstack.function[i], " ", &ptr));
          if (!ptr) fprintf(file, "[%d] #%d %s()\n", PetscGlobalRank, j, petscstack.function[i]);
          else fprintf(file, "[%d] #%d %s\n", PetscGlobalRank, j, petscstack.function[i]);
        }
      }
    }
  }
  return PETSC_SUCCESS;
}

/*
  PetscStackCopy - Copy the information from one PETSc stack to another

  Not Collective

  Input Parameter:
. sint - the stack to be copied from

  Output Parameter:
. sout - the stack to be copied to, this stack must already exist

  Level: developer

  Note:
  In debug mode PETSc maintains a stack of the current function calls that can be used to help
  to quickly see where a problem has occurred, for example, when a signal is received. It is
  recommended to use the debugger if extensive information is needed to help debug the problem.

.seealso: `PetscAttachDebugger()`, `PetscStackView()`
*/
PetscErrorCode PetscStackCopy(PetscStack *sint, PetscStack *sout)
{
  if (sint) {
    for (int i = 0; i < sint->currentsize; ++i) {
      sout->function[i]     = sint->function[i];
      sout->file[i]         = sint->file[i];
      sout->line[i]         = sint->line[i];
      sout->petscroutine[i] = sint->petscroutine[i];
    }
    sout->currentsize = sint->currentsize;
  } else {
    sout->currentsize = 0;
  }
  return PETSC_SUCCESS;
}

/*
  PetscStackPrint - Prints a given PETSc stack to an ASCII file

  Not Collective

  Input Parameters:
+ sint - the PETSc stack to print
- file - the file pointer

  Level: developer

  Notes:
  In debug mode PETSc maintains a stack of the current function calls that can be used to help
  to quickly see where a problem has occurred, for example, when a signal is received. It is
  recommended to use the debugger if extensive information is needed to help debug the problem.

  The default stack is a global variable called `petscstack`.

  Developer Note:
  `PetscStackPrint()` and `PetscStackView()` should be merged into a single API.

.seealso: `PetscAttachDebugger()`, `PetscStackCopy()`, `PetscStackView()`
*/
PetscErrorCode PetscStackPrint(PetscStack *sint, FILE *fp)
{
  if (sint) {
    for (int i = sint->currentsize - 2; i >= 0; --i) {
      if (sint->file[i]) fprintf(fp, "      [%d]  %s() at %s:%d\n", PetscGlobalRank, sint->function[i], PetscCIFilename(sint->file[i]), PetscCILinenumber(sint->line[i]));
      else fprintf(fp, "      [%d]  %s()\n", PetscGlobalRank, sint->function[i]);
    }
  }
  return PETSC_SUCCESS;
}
#endif /* PetscDefined(USE_DEBUG) */