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

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

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

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

CCTK_FILEVERSION(CactusBase_IOBasic_Output_c)

/* function prototypes */
int IOBasic_TimeForOutput (cGH *GH, int vindex);
int IOBasic_OutputGH (cGH *GH);
static void CheckSteerableParameters (iobasicGH *myGH);
static void SetOutputFlag (int vindex, const char *optstring, void *arg);


/*@@
   @routine    IOBasic_OutputGH
   @date       Sat March 6 1999
   @author     Gabrielle Allen
   @desc
   Loops over all variables and outputs them if necessary
   @enddesc
   @calledby   CCTK_OutputGH ("IOBasic")
   @history

   @endhistory
   @var     GH
   @vdesc   Pointer to CCTK GH
   @vtype   cGH
   @vio     in
   @endvar
@@*/
int IOBasic_OutputGH (cGH *GH)
{
  int vindex;
  const char *name;
  iobasicGH *myGH;


  /* Get the GH extensions for IOBasic */
  myGH = (iobasicGH *) GH->extensions [CCTK_GHExtensionHandle ("IOBasic")];

  CheckSteerableParameters (myGH);

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

  /* Loop over all variables */
  for (vindex = 0; vindex < CCTK_NumVars (); vindex++)
  {

    /* Is it time for output ? */
    if (! IOBasic_TimeForOutput (GH, vindex))
    {
      continue;
    }

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

#ifdef IO_DEBUG
    printf("\nIn IOBasic_OutputGH\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 (CCTK_GroupTypeFromVarI (vindex) == CCTK_SCALAR)
    {
      IOBasic_Write (GH, vindex, name);
    }
    else
    {
      IOBasic_WriteGF (GH, vindex, name);
    }

    /* Register GF as having 0D output this iteration */
    myGH->outScalar_last [vindex] = GH->cctk_iteration;

  } /* end of loop over all variables */

  return (0);
}


/*@@
   @routine    IOBasic_OutputVarAs
   @date       Sat March 6 1999
   @author     Gabrielle Allen
   @desc
   unconditional output of a variable using the IOBasic output method
   @enddesc
   @calledby IOBasic_OutputGH, CCTK_OutputVarAsByMethod ("IOBasic")
   @var     GH
   @vdesc   Pointer to CCTK GH
   @vtype   cGH
   @vio     in
   @vcomment
   @endvar
   @var     fullname
   @vdesc   complete name of variable to output
   @vtype   const char *
   @vio     in
   @vcomment
   @endvar
   @var     alias
   @vdesc   alias name of variable to output (used to generate output filename)
   @vtype   const char *
   @vio     in
   @vcomment
   @endvar
@@*/
int IOBasic_OutputVarAs (cGH *GH, const char *fullname, const char *alias)
{
  int vindex;


  vindex = CCTK_VarIndex (fullname);

#ifdef IO_DEBUG
  printf("\nIn IOBasic_OutputVarAs\n-------------------\n");
  printf("  Fullname = -%s-\n",fullname);
  printf("  Alias = -%s-\n",alias);
  printf("  Index = %d\n",vindex);
#endif

  if (CCTK_GroupTypeFromVarI (vindex) == CCTK_SCALAR)
  {
    IOBasic_Write (GH, vindex, alias);
  }
  else
  {
    IOBasic_WriteGF (GH, vindex, alias);
  }

  return (0);
}


 /*@@
   @routine    IOBasic_TimeForOutput
   @date       Sat March 6 1999
   @author     Gabrielle Allen
   @desc 
   Decides if it is time to output a variable using Scalar output
   method
   @enddesc 
   @calls    CCTK_GHExtensionHandle 
             CCTK_GroupTypeFromVar
             CCTK_WARN
   @calledby   
   @history 
 
   @endhistory 
   @var     GH
   @vdesc   Pointer to CCTK GH
   @vtype   cGH
   @vio     in
   @vcomment 
   @endvar 
   @var     vindex
   @vdesc   index of variable
   @vtype   int
   @vio     in
   @vcomment 
   @endvar 
@@*/
                  
int IOBasic_TimeForOutput (cGH *GH, int vindex)
{
  int return_type;
  iobasicGH *myGH;
  char *fullname;


  /* Default is do not do output */
  return_type = 0;

  /* Get the GH extension for IOBasic */
  myGH = (iobasicGH *) GH->extensions [CCTK_GHExtensionHandle ("IOBasic")];

  CheckSteerableParameters (myGH);

  /* check if any output was requested */
  if (myGH->outScalar_every <= 0)
  {
    return (0);
  }

  /* Check if this variable should be output */
  if (myGH->do_outScalar [vindex] &&
      (GH->cctk_iteration % myGH->outScalar_every) == 0)
  {
    /* Check if variable wasn't already output this iteration */
    if (myGH->outScalar_last [vindex] == GH->cctk_iteration)
    {
      fullname = CCTK_FullName (vindex);
      CCTK_VWarn (5, __LINE__, __FILE__, CCTK_THORNSTRING,
                  "Already done IOBasic scalar output for '%s' in "
                  "current iteration (probably via triggers)", fullname);
      free (fullname);
    }
    else
    {
      return_type = 1;
    }
  }

  return (return_type);
}


/*@@
   @routine    IOBasic_TriggerOutput
   @date       Sat March 6 1999
   @author     Gabrielle Allen
   @desc
               Triggers the output a variable using IOBasic's Scalar
               output method
   method
   @enddesc
   @calledby   CCTK scheduler
   @var        GH
   @vdesc      Pointer to CCTK GH
   @vtype      cGH
   @vio        in
   @vcomment
   @endvar
   @var        vindex
   @vdesc      index of variable to output
   @vtype      int
   @vio        in
   @vcomment
   @endvar
@@*/
int IOBasic_TriggerOutput (cGH *GH, int vindex)
{
  const char *name;
  iobasicGH *myGH;


  /* Get the GH extension for IOBasic */
  myGH = (iobasicGH *) GH->extensions [CCTK_GHExtensionHandle ("IOBasic")];
  
  name = CCTK_VarName (vindex);

#ifdef IO_DEBUG
  printf ("\nIn IOBasic_TriggerOutput\n---------------------\n");
  printf ("  Index = %d\n", vindex);
  printf ("  Variable = -%s-\n", name);
#endif
  
  /* Do the Scalar output */
  if (CCTK_GroupTypeFromVarI (vindex) == CCTK_SCALAR)
  {
    IOBasic_Write (GH, vindex, name);
  }
  else
  {
    IOBasic_WriteGF (GH, vindex, name);
  }

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


/**************************** local functions ******************************/
/* check if steerable parameters have changed */
static void CheckSteerableParameters (iobasicGH *myGH)
{
  int times_set;
  int out_old;
  int i;
  static int outScalar_vars_lastset = -1;
  DECLARE_CCTK_PARAMETERS


  /* How often to output */
  out_old = myGH->outScalar_every;
  myGH->outScalar_every = out_every > 0 ? out_every : -1;
  if (outScalar_every > 0)
  {
    myGH->outScalar_every = outScalar_every;
  }
  if (myGH->outScalar_every != out_old)
  {
    if (CCTK_Equals(newverbose,"standard") || CCTK_Equals(newverbose,"full"))
    {
      CCTK_VInfo("IOBasic","Scalar: Output every %d iterations",
		 myGH->outScalar_every);
    }
  }
    
  /* re-parse the 'outScalar_vars' parameter if it was changed */
  times_set = CCTK_ParameterQueryTimesSet ("outScalar_vars", CCTK_THORNSTRING);
  if (times_set != outScalar_vars_lastset)
  {
    memset (myGH->do_outScalar, 0, CCTK_NumVars ());
    CCTK_TraverseString (outScalar_vars, SetOutputFlag, myGH->do_outScalar,
                         CCTK_GROUP_OR_VAR);

    if (CCTK_Equals(newverbose,"full"))
    {
      for (i=0;i<CCTK_NumVars();i++)
      {
	if (myGH->do_outScalar[i] > 0)
	{
	  CCTK_VInfo("IOBasic","Scalar: Output requested for %s",
		     CCTK_VarName(i));
	}
      }
    }

    /* Save the last setting of 'outScalar_vars' parameter */
    outScalar_vars_lastset = times_set;
  }

}


/* callback for CCTK_TraverseString() to set the output flag
   for the given variable */
static void SetOutputFlag (int vindex, const char *optstring, void *arg)
{
  char *flags = (char *) arg;


  flags[vindex] = 1;

  if (optstring)
  {
    CCTK_VWarn (5, __LINE__, __FILE__, CCTK_THORNSTRING,
                "Optional string '%s' in variable name ignored", optstring);
  }
}