/*@@
   @file      Output.c
   @date      Mon 21 September
   @author    Gabrielle Allen
   @desc
              Functions to deal with scalar output of grid variables
   @enddesc
 @@*/

/* #define IOBASIC_DEBUG 1 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "cctk.h"
#include "cctk_Parameters.h"
#include "util_String.h"
#include "iobasicGH.h"

static const char *rcsid = "$Header$";

CCTK_FILEVERSION(CactusBase_IOBasic_OutputScalar_c)


/********************************************************************
 ********************    Internal Routines   ************************
 ********************************************************************/
static void CheckSteerableParameters (iobasicGH *myGH);


/*@@
   @routine    IOBasic_ScalarOutputGH
   @date       Sat March 6 1999
   @author     Gabrielle Allen
   @desc
               Loops over all variables and outputs them if necessary
   @enddesc
   @calls      IOBasic_TimeForScalarOutput
               IOBasic_WriteScalar

   @var        GH
   @vdesc      Pointer to CCTK GH
   @vtype      const cGH *
   @vio        in
   @endvar

   @returntype int
   @returndesc
               the number of variables which were output at this iteration
               (or 0 if it wasn't time to output yet)
   @endreturndesc
@@*/
int IOBasic_ScalarOutputGH (const cGH *GH)
{
  int vindex, retval;
  const char *name;
  iobasicGH *myGH;


  /* Get the GH extensions for IOBasic */
  myGH = (iobasicGH *) CCTK_GHExtension (GH, "IOBasic");

  CheckSteerableParameters (myGH);

  /* Return if no output is required */
  if (myGH->outScalar_every <= 0)
  {
    return (0);
  }

  /* Loop over all variables */
  for (vindex = retval = 0; vindex < CCTK_NumVars (); vindex++)
  {
    /* Is it time for output ? */
    if (! IOBasic_TimeForScalarOutput (GH, vindex))
    {
      continue;
    }

    /* Get the variable name for this index (for filename) */
    name = CCTK_VarName (vindex);

#ifdef IOBASIC_DEBUG
    printf("\nIn IOBasic_ScalarOutputGH\n----------------\n");
    printf("  Index = %d\n",vindex);
    printf("  Variable = -%s-\n",name);
    printf("  Last output iteration was = %d\n",myGH->outScalar_last[vindex]);
#endif

    /* Make the IO call */
    if (IOBasic_WriteScalar (GH, vindex, name) == 0)
    {
      /* Register GF as having 0D output this iteration */
      myGH->outScalar_last [vindex] = GH->cctk_iteration;
      retval++;
    }
  } /* end of loop over all variables */

  return (retval);
}


 /*@@
   @routine    IOBasic_TimeForScalarOutput
   @date       Sat March 6 1999
   @author     Gabrielle Allen
   @desc
               Decides if it is time to do Scalar output.
   @enddesc

   @var        GH
   @vdesc      Pointer to CCTK GH
   @vtype      const cGH *
   @vio        in
   @endvar
   @var        vindex
   @vdesc      index of variable
   @vtype      int
   @vio        in
   @endvar

   @returntype int
   @returndesc
               1 if output should take place at this iteration, or<BR>
               0 if not
   @endreturndesc
@@*/
int IOBasic_TimeForScalarOutput (const cGH *GH, int vindex)
{
  int retval;
  char *fullname;
  iobasicGH *myGH;


  /* Get the GH extension for IOBasic */
  myGH = (iobasicGH *) CCTK_GHExtension (GH, "IOBasic");

  CheckSteerableParameters (myGH);

  /* check if any output was requested */
  if (myGH->outScalar_every <= 0 || GH->cctk_iteration % myGH->outScalar_every
      || myGH->scalar_reductions[vindex].num_reductions == 0)
  {
    retval = 0;
  }
  else
  {
    /* Check if variable wasn't already output this iteration */
    retval = myGH->outScalar_last [vindex] != GH->cctk_iteration;
    if (! retval)
    {
      fullname = CCTK_FullName (vindex);
      CCTK_VWarn (5, __LINE__, __FILE__, CCTK_THORNSTRING,
                  "Already done scalar output for '%s' in current iteration "
                  "(probably via triggers)", fullname);
      free (fullname);
    }
  }

  return (retval);
}


/*@@
   @routine    IOBasic_TriggerScalarOutput
   @date       Sat March 6 1999
   @author     Gabrielle Allen
   @desc
               Triggers the output of a variable using IOBasic's Scalar
               output method
   @enddesc

   @var        GH
   @vdesc      Pointer to CCTK GH
   @vtype      const cGH *
   @vio        in
   @endvar
   @var        vindex
   @vdesc      index of variable to output
   @vtype      int
   @vio        in
   @endvar

   @returntype int
   @returndesc
               return code of @seeroutine IOBasic_WriteScalar
   @endreturndesc
@@*/
int IOBasic_TriggerScalarOutput (const cGH *GH, int vindex)
{
  int retval;
  const char *name;
  iobasicGH *myGH;


  /* Get the GH extension for IOBasic */
  myGH = (iobasicGH *) CCTK_GHExtension (GH, "IOBasic");

  name = CCTK_VarName (vindex);

#ifdef IOBASIC_DEBUG
  printf ("\nIn IOBasic_TriggerScalarOutput\n---------------------\n");
  printf ("  Index = %d\n", vindex);
  printf ("  Variable = -%s-\n", name);
#endif

  /* Do the Scalar output */
  retval = IOBasic_WriteScalar (GH, vindex, name);

  if (retval == 0)
  {
    /* Register variable as having Scalar output this iteration */
    myGH->outScalar_last [vindex] = GH->cctk_iteration;
  }

  return (retval);
}


/********************************************************************
 ********************    Internal Routines   ************************
 ********************************************************************/
 /*@@
   @routine    CheckSteerableParameters
   @date       Tue 31 Jul 2001
   @author     Thomas Radke
   @desc
               Re-evaluates 'IOBasic::outScalar_every' and/or 'IO::out_every'
               resp. to set myGH->outScalar_every to the frequency of scalar
               output. Re-evaluates 'IOBasic::outScalar_vars' and
               'IOBasic::outScalar_reductions'.
   @enddesc
   @calls      CCTK_ParameterQueryTimesSet

   @var        myGH
   @vdesc      Pointer to IOBasic's GH extension
   @vtype      iobasicGH *
   @vio        in
   @endvar
@@*/
static void CheckSteerableParameters (iobasicGH *myGH)
{
  int vindex, out_old, times_set, update_reductions_list, num_vars;
  iobasic_reduction_t *reduction, *next;
  static int outScalar_vars_lastset       = -1;
  static int outScalar_reductions_lastset = -1;
  iobasic_parseinfo_t info;
  char *msg, *oldmsg, *fullname;
  DECLARE_CCTK_PARAMETERS


  /* how often to output */
  out_old = myGH->outScalar_every;
  myGH->outScalar_every = outScalar_every >= 0 ? outScalar_every : out_every;

  /* report if frequency changed */
  if (myGH->outScalar_every != out_old && ! CCTK_Equals (newverbose, "none"))
  {
    if (myGH->outScalar_every > 0)
    {
      CCTK_VInfo (CCTK_THORNSTRING, "Scalar: Periodic output every %d "
                  "iterations", myGH->outScalar_every);
    }
    else
    {
      CCTK_INFO ("Scalar: Periodic output turned off");
    }
  }

  /* return if there's nothing to do */
  if (myGH->outScalar_every <= 0)
  {
    return;
  }

  /* check if the 'outScalar_reductions' parameter if it was changed */
  times_set = CCTK_ParameterQueryTimesSet ("outScalar_reductions",
                                           CCTK_THORNSTRING);
  update_reductions_list = times_set != outScalar_reductions_lastset;
  outScalar_reductions_lastset = times_set;

  /* check if the 'outScalar_vars' parameter if it was changed */
  times_set = CCTK_ParameterQueryTimesSet ("outScalar_vars", CCTK_THORNSTRING);
  update_reductions_list |= times_set != outScalar_vars_lastset;
  outScalar_vars_lastset = times_set;

  if (update_reductions_list)
  {
    /* free old reduction lists ... */
    num_vars = CCTK_NumVars ();
    for (vindex = 0; vindex < num_vars; vindex++)
    {
      if (myGH->scalar_reductions[vindex].num_reductions > 0)
      {
        myGH->scalar_reductions[vindex].num_reductions = 0;
        reduction = myGH->scalar_reductions[vindex].reductions;
        while (reduction)
        {
          next = reduction->next;
          free (reduction->name);
          free (reduction);
          reduction = next;
        }
      }
    }

    /* ... and create new ones */
    info.reduction_list = myGH->scalar_reductions;
    info.reductions_string = outScalar_reductions;
    if (CCTK_TraverseString (outScalar_vars, IOBasic_AssignReductionList, &info,
                             CCTK_GROUP_OR_VAR) < 0)
    {
      CCTK_WARN (1, "Failed to parse 'IOBasic::outScalar_vars' parameter");
    }
    else if (! CCTK_Equals (newverbose, "none"))
    {
      msg = NULL;
      for (vindex = 0; vindex < num_vars; vindex++)
      {
        if (myGH->scalar_reductions[vindex].num_reductions)
        {
          fullname = CCTK_FullName (vindex);
          if (! msg)
          {
            Util_asprintf (&msg, "Scalar: Periodic output requested for '%s'",
                           fullname);
          }
          else
          {
            oldmsg = msg;
            Util_asprintf (&msg, "%s, '%s'", oldmsg, fullname);
            free (oldmsg);
          }
          free (fullname);
        }
      }
      if (msg)
      {
        CCTK_INFO (msg);
        free (msg);
      }
    }
  }
}