/*
   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
   SLEPc - Scalable Library for Eigenvalue Problem Computations
   Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain

   This file is part of SLEPc.
   SLEPc is distributed under a 2-clause BSD license (see LICENSE).
   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*/

#include <petsc/private/ftnimpl.h>
#include <slepcmfn.h>

#if defined(PETSC_HAVE_FORTRAN_CAPS)
#define mfnmonitordefault_                MFNMONITORDEFAULT
#define mfnmonitorset_                    MFNMONITORSET
#elif !defined(PETSC_HAVE_FORTRAN_UNDERSCORE)
#define mfnmonitordefault_                mfnmonitordefault
#define mfnmonitorset_                    mfnmonitorset
#endif

/*
   These cannot be called from Fortran but allow Fortran users
   to transparently set these monitors from .F code
*/
SLEPC_EXTERN void mfnmonitordefault_(MFN*,PetscInt*,PetscReal*,PetscViewerAndFormat*,PetscErrorCode*);

static struct {
  PetscFortranCallbackId monitor;
  PetscFortranCallbackId monitordestroy;
} _cb;

/* These are not extern C because they are passed into non-extern C user level functions */
static PetscErrorCode ourmonitor(MFN mfn,PetscInt i,PetscReal d,void *ctx)
{
  PetscObjectUseFortranCallback(mfn,_cb.monitor,(MFN*,PetscInt*,PetscReal*,void*,PetscErrorCode*),(&mfn,&i,&d,_ctx,&ierr));
}

static PetscErrorCode ourdestroy(PetscCtxRt ctx)
{
  MFN mfn = *(MFN*)ctx;
  PetscObjectUseFortranCallback(mfn,_cb.monitordestroy,(void*,PetscErrorCode*),(_ctx,&ierr));
}

SLEPC_EXTERN void mfnmonitorset_(MFN *mfn,void (*monitor)(MFN*,PetscInt*,PetscReal*,void*,PetscErrorCode*),void *mctx,void (*monitordestroy)(void*,PetscErrorCode*),PetscErrorCode *ierr)
{
  CHKFORTRANNULLOBJECT(mctx);
  CHKFORTRANNULLFUNCTION(monitordestroy);
  if ((PetscFortranCallbackFn*)monitor == (PetscFortranCallbackFn*)mfnmonitordefault_) {
    *ierr = MFNMonitorSet(*mfn,(MFNMonitorFn*)MFNMonitorDefault,*(PetscViewerAndFormat**)mctx,(PetscCtxDestroyFn*)PetscViewerAndFormatDestroy);
  } else {
    *ierr = PetscObjectSetFortranCallback((PetscObject)*mfn,PETSC_FORTRAN_CALLBACK_CLASS,&_cb.monitor,(PetscFortranCallbackFn*)monitor,mctx); if (*ierr) return;
    *ierr = PetscObjectSetFortranCallback((PetscObject)*mfn,PETSC_FORTRAN_CALLBACK_CLASS,&_cb.monitordestroy,(PetscFortranCallbackFn*)monitordestroy,mctx); if (*ierr) return;
    *ierr = MFNMonitorSet(*mfn,ourmonitor,*mfn,ourdestroy);
  }
}
