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

PetscFunctionList PetscViewerList = 0;

PetscErrorCode PetscOptionsFindPair_Private(const char[],const char[],char*[],PetscBool*);
#undef __FUNCT__
#define __FUNCT__ "PetscOptionsGetViewer"
/*@C
   PetscOptionsGetViewer - Gets a viewer appropriate for the type indicated by the user

   Collective on MPI_Comm

   Input Parameters:
+  comm - the communicator to own the viewer
.  pre - the string to prepend to the name or NULL
-  name - the option one is seeking

   Output Parameter:
+  viewer - the viewer
.  format - the PetscViewerFormat requested by the user
-  set - PETSC_TRUE if found, else PETSC_FALSE

   Level: intermediate

   Notes: If no value is provided ascii:stdout is used
$       ascii[:[filename][:format]]   defaults to stdout - format can be one of ascii_info, ascii_info_detail, or ascii_matlab, for example ascii::ascii_info prints just the info
$                                     about the object to standard out
$       binary[:filename]   defaults to binaryoutput
$       draw
$       socket[:port]    defaults to the standard output port

   Use PetscViewerDestroy() after using the viewer, otherwise a memory leak will occur

.seealso: PetscOptionsGetReal(), PetscOptionsHasName(), PetscOptionsGetString(),
          PetscOptionsGetIntArray(), PetscOptionsGetRealArray(), PetscOptionsBool()
          PetscOptionsInt(), PetscOptionsString(), PetscOptionsReal(), PetscOptionsBool(),
          PetscOptionsName(), PetscOptionsBegin(), PetscOptionsEnd(), PetscOptionsHead(),
          PetscOptionsStringArray(),PetscOptionsRealArray(), PetscOptionsScalar(),
          PetscOptionsBoolGroupBegin(), PetscOptionsBoolGroup(), PetscOptionsBoolGroupEnd(),
          PetscOptionsList(), PetscOptionsEList()
@*/
PetscErrorCode  PetscOptionsGetViewer(MPI_Comm comm,const char pre[],const char name[],PetscViewer *viewer,PetscViewerFormat *format,PetscBool  *set)
{
  char           *value;
  PetscErrorCode ierr;
  PetscBool      flag;

  PetscFunctionBegin;
  PetscValidCharPointer(name,3);

  if (format) *format = PETSC_VIEWER_DEFAULT;
  if (set) *set = PETSC_FALSE;
  ierr = PetscOptionsFindPair_Private(pre,name,&value,&flag);CHKERRQ(ierr);
  if (flag) {
    if (set) *set = PETSC_TRUE;
    if (!value) {
      ierr = PetscViewerASCIIGetStdout(comm,viewer);CHKERRQ(ierr);
      ierr = PetscObjectReference((PetscObject)*viewer);CHKERRQ(ierr);
    } else {
      char       *cvalue,*loc,*loc2 = NULL;
      PetscInt   cnt;
      const char *viewers[] = {PETSCVIEWERASCII,PETSCVIEWERBINARY,PETSCVIEWERDRAW,PETSCVIEWERSOCKET,PETSCVIEWERMATLAB,PETSCVIEWERVTK,0};

      ierr = PetscStrallocpy(value,&cvalue);CHKERRQ(ierr);
      ierr = PetscStrchr(cvalue,':',&loc);CHKERRQ(ierr);
      if (loc) {*loc = 0; loc++;}
      ierr = PetscStrendswithwhich(*cvalue ? cvalue : "ascii",viewers,&cnt);CHKERRQ(ierr);
      if (cnt > (PetscInt) sizeof(viewers)-1) SETERRQ1(comm,PETSC_ERR_ARG_OUTOFRANGE,"Unknown viewer type: %s",cvalue);
      if (!loc) {
        switch (cnt) {
        case 0:
          ierr = PetscViewerASCIIGetStdout(comm,viewer);CHKERRQ(ierr);
          break;
        case 1:
          *viewer = PETSC_VIEWER_BINARY_(comm);CHKERRQ(ierr);
          break;
        case 2:
          *viewer = PETSC_VIEWER_DRAW_(comm);CHKERRQ(ierr);
          break;
#if defined(PETSC_USE_SOCKET_VIEWER)
        case 3:
          *viewer = PETSC_VIEWER_SOCKET_(comm);CHKERRQ(ierr);
          break;
#endif
#if defined(PETSC_HAVE_MATLAB_ENGINE)
        case 4:
          *viewer = PETSC_VIEWER_MATLAB_(comm);CHKERRQ(ierr);
          break;
#endif
        default: SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"Unsupported viewer %s",cvalue);CHKERRQ(ierr);
          break;
        }
        ierr = PetscObjectReference((PetscObject)*viewer);CHKERRQ(ierr);
      } else {
        ierr = PetscStrchr(loc,':',&loc2);CHKERRQ(ierr);
        if (loc2) {*loc2 = 0; loc2++;}
        if (loc2 && !*loc && (cnt == 0)) { /* ASCII format without file name */
          ierr = PetscViewerASCIIGetStdout(comm,viewer);CHKERRQ(ierr);
          ierr = PetscObjectReference((PetscObject)*viewer);CHKERRQ(ierr);
        } else {
          ierr = PetscViewerCreate(comm,viewer);CHKERRQ(ierr);
          ierr = PetscViewerSetType(*viewer,*cvalue ? cvalue : "ascii");CHKERRQ(ierr);
          ierr = PetscViewerFileSetMode(*viewer,FILE_MODE_WRITE);CHKERRQ(ierr);
          ierr = PetscViewerFileSetName(*viewer,loc);CHKERRQ(ierr);
        }
      }
      ierr = PetscViewerSetUp(*viewer);CHKERRQ(ierr);
      if (loc2 && *loc2) {
        ierr = PetscStrtoupper(loc2);CHKERRQ(ierr);
        ierr = PetscStrendswithwhich(loc2,PetscViewerFormats,&cnt);CHKERRQ(ierr);
        if (!PetscViewerFormats[cnt]) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"Unknown viewer format %s",loc2);CHKERRQ(ierr);
        if (format) *format = (PetscViewerFormat)cnt;
      }
      ierr = PetscFree(cvalue);CHKERRQ(ierr);
    }
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerCreate"
/*@
   PetscViewerCreate - Creates a viewing context

   Collective on MPI_Comm

   Input Parameter:
.  comm - MPI communicator

   Output Parameter:
.  inviewer - location to put the PetscViewer context

   Level: advanced

   Concepts: graphics^creating PetscViewer
   Concepts: file input/output^creating PetscViewer
   Concepts: sockets^creating PetscViewer

.seealso: PetscViewerDestroy(), PetscViewerSetType(), PetscViewerType

@*/
PetscErrorCode  PetscViewerCreate(MPI_Comm comm,PetscViewer *inviewer)
{
  PetscViewer    viewer;
  PetscErrorCode ierr;

  PetscFunctionBegin;
  *inviewer = 0;
#if !defined(PETSC_USE_DYNAMIC_LIBRARIES)
  ierr = PetscViewerInitializePackage(NULL);CHKERRQ(ierr);
#endif
  ierr         = PetscHeaderCreate(viewer,_p_PetscViewer,struct _PetscViewerOps,PETSC_VIEWER_CLASSID,"PetscViewer","PetscViewer","Viewer",comm,PetscViewerDestroy,0);CHKERRQ(ierr);
  *inviewer    = viewer;
  viewer->data = 0;
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerSetType"
/*@C
   PetscViewerSetType - Builds PetscViewer for a particular implementation.

   Collective on PetscViewer

   Input Parameter:
+  viewer      - the PetscViewer context
-  type        - for example, "ASCII"

   Options Database Command:
.  -draw_type  <type> - Sets the type; use -help for a list
    of available methods (for instance, ascii)

   Level: advanced

   Notes:
   See "include/petscviewer.h" for available methods (for instance,
   PETSC_VIEWER_SOCKET)

.seealso: PetscViewerCreate(), PetscViewerGetType(), PetscViewerType
@*/
PetscErrorCode  PetscViewerSetType(PetscViewer viewer,PetscViewerType type)
{
  PetscErrorCode ierr,(*r)(PetscViewer);
  PetscBool      match;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,1);
  PetscValidCharPointer(type,2);
  CHKMEMQ;
  ierr = PetscObjectTypeCompare((PetscObject)viewer,type,&match);CHKERRQ(ierr);
  if (match) PetscFunctionReturn(0);

  /* cleanup any old type that may be there */
  if (viewer->data) {
    ierr         = (*viewer->ops->destroy)(viewer);CHKERRQ(ierr);

    viewer->ops->destroy = NULL;
    viewer->data         = 0;
  }
  ierr = PetscMemzero(viewer->ops,sizeof(struct _PetscViewerOps));CHKERRQ(ierr);

  ierr =  PetscFunctionListFind(PetscObjectComm((PetscObject)viewer),PetscViewerList,type,PETSC_TRUE,(void (**)(void)) &r);CHKERRQ(ierr);
  if (!r) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_ARG_UNKNOWN_TYPE,"Unknown PetscViewer type given: %s",type);

  ierr = PetscObjectChangeTypeName((PetscObject)viewer,type);CHKERRQ(ierr);
  ierr = (*r)(viewer);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerRegisterDestroy"
/*@C
   PetscViewerRegisterDestroy - Frees the list of PetscViewer methods that were
   registered by PetscViewerRegisterDynamic().

   Not Collective

   Level: developer

.seealso: PetscViewerRegisterDynamic(), PetscViewerRegisterAll()
@*/
PetscErrorCode  PetscViewerRegisterDestroy(void)
{
  PetscErrorCode ierr;

  PetscFunctionBegin;
  ierr = PetscFunctionListDestroy(&PetscViewerList);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerRegister"
PetscErrorCode  PetscViewerRegister(const char *sname,const char *path,const char *name,PetscErrorCode (*function)(PetscViewer))
{
  PetscErrorCode ierr;
  char           fullname[PETSC_MAX_PATH_LEN];

  PetscFunctionBegin;
  ierr = PetscFunctionListConcat(path,name,fullname);CHKERRQ(ierr);
  ierr = PetscFunctionListAdd(PETSC_COMM_WORLD,&PetscViewerList,sname,fullname,(void (*)(void))function);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscViewerSetFromOptions"
/*@C
   PetscViewerSetFromOptions - Sets the graphics type from the options database.
      Defaults to a PETSc X windows graphics.

   Collective on PetscViewer

   Input Parameter:
.     PetscViewer - the graphics context

   Level: intermediate

   Notes:
    Must be called after PetscViewerCreate() before the PetscViewer is used.

  Concepts: PetscViewer^setting options

.seealso: PetscViewerCreate(), PetscViewerSetType(), PetscViewerType

@*/
PetscErrorCode  PetscViewerSetFromOptions(PetscViewer viewer)
{
  PetscErrorCode ierr;
  char           vtype[256];
  PetscBool      flg;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,1);

  if (!PetscViewerList) {
    ierr = PetscViewerRegisterAll(NULL);CHKERRQ(ierr);
  }
  ierr = PetscObjectOptionsBegin((PetscObject)viewer);CHKERRQ(ierr);
  ierr = PetscOptionsList("-viewer_type","Type of PetscViewer","None",PetscViewerList,(char*)(((PetscObject)viewer)->type_name ? ((PetscObject)viewer)->type_name : PETSCVIEWERASCII),vtype,256,&flg);CHKERRQ(ierr);
  if (flg) {
    ierr = PetscViewerSetType(viewer,vtype);CHKERRQ(ierr);
  }
  /* type has not been set? */
  if (!((PetscObject)viewer)->type_name) {
    ierr = PetscViewerSetType(viewer,PETSCVIEWERASCII);CHKERRQ(ierr);
  }
  if (viewer->ops->setfromoptions) {
    ierr = (*viewer->ops->setfromoptions)(viewer);CHKERRQ(ierr);
  }

  /* process any options handlers added with PetscObjectAddOptionsHandler() */
  ierr = PetscObjectProcessOptionsHandlers((PetscObject)viewer);CHKERRQ(ierr);
  ierr = PetscOptionsEnd();CHKERRQ(ierr);
  PetscFunctionReturn(0);
}