/*@@
   @file      Write.c
   @date      Thu 18 April 2002
   @author    Thomas Radke
   @desc
              Output two-dimensional slices in Jpeg image format.
   @enddesc
   @version   $Id$
 @@*/


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

#include "cctk.h"
#include "cctk_Parameters.h"
#include "util_Table.h"
#include "CactusBase/IOUtil/src/ioutil_AdvertisedFiles.h"
#include "ioJpegGH.h"

/* the rcs ID and its dummy function to use it */
static const char *rcsid = "$Header$";
CCTK_FILEVERSION(CactusIO_IOJpeg_Write_c)


/********************************************************************
 ********************    Internal Routines   ************************
 ********************************************************************/
static void WriteData (const cGH *GH, int vindex, const char *alias, int dim,
                       int dir, CCTK_REAL min, CCTK_REAL max,
                       const CCTK_INT hsize[2], const void *hdata);
static void *RefineData (CCTK_INT input_dims[2], const void *input_data);


/*@@
   @routine   IOJpeg_Write
   @date      Thu 18 April 2002
   @author    Thomas Radke
   @desc
              Writes the slices of a variable into separate Jpeg files.
   @enddesc
   @calls     Hyperslab_GlobalMappingByIndex
              Hyperslab_FreeMapping
              Hyperslab_GetList
              OpenFile
              WriteData

   @var       GH
   @vdesc     pointer to CCTK GH
   @vtype     const cGH *
   @vio       in
   @endvar
   @var       vindex
   @vdesc     index of variable to output
   @vtype     CCTK_INT
   @vio       in
   @endvar
   @var       alias
   @vdesc     alias name of variable to output
   @vtype     const char *
   @vio       in
   @endvar

   @returntype int
   @returndesc
                0 for success, or<BR>
               -1 if variable has no storage assigned<BR>
               -2 if output file couldn't be opened<BR>
               -3 if hyperslab for coordinates and/or variable couldn't be
                  extracted
   @endreturndesc
@@*/
int IOJpeg_Write (const cGH *GH, CCTK_INT vindex, const char *alias)
{
  const ioJpegGH *myGH;
  int i, mapping, total_hsize;
  int dir, dir_i, dir_j, maxdir, myproc, groupindex;
  cGroup gdata;
  char *fullname;
  CCTK_INT origin[3], direction[6], hsize[2];
  const CCTK_INT extent[2] = {-1, -1};
  void *hdata, *outdata;
  CCTK_REAL min, max;
  const CCTK_INT htype = CCTK_VARIABLE_REAL;
  DECLARE_CCTK_PARAMETERS


  /* get the variable name and group information */
  fullname = CCTK_FullName (vindex);
  groupindex = CCTK_GroupIndexFromVarI (vindex);
  CCTK_GroupData (groupindex, &gdata);

  /* check if variable has storage assigned */
  if (! CCTK_QueryGroupStorageI (GH, groupindex))
  {
    CCTK_VWarn (2, __LINE__, __FILE__, CCTK_THORNSTRING,
                "No IOJpeg output for '%s' (no storage)", fullname);
    free (fullname);
    return (-1);
  }

  /* get the handle for IOJpeg extensions */
  myproc = CCTK_MyProc (GH);
  myGH = (const ioJpegGH *) CCTK_GHExtension (GH, "IOJpeg");

  /* set the minimum/maximum for the colormap */
  if (CCTK_Equals (colormap, "custom"))
  {
    min = colormap_min;
    max = colormap_max;
  }
  else
  {
    i = CCTK_ReductionHandle ("minimum");
    CCTK_Reduce (GH, 0, i, 1, CCTK_VARIABLE_REAL, &min, 1, vindex);
    i = CCTK_ReductionHandle ("maximum");
    CCTK_Reduce (GH, 0, i, 1, CCTK_VARIABLE_REAL, &max, 1, vindex);
  }

  /* get the number of slices to output */
  /* in general: maxdir = gdata.dim * (gdata.dim - 1) / 2; */
  maxdir = gdata.dim == 2 ? 1 : 3;

  /* now do the actual I/O looping over all directions */
  for (dir = 0; dir < maxdir; dir++)
  {
    /* get the directions to span the hyperslab */
    if (dir == 0)
    {
      dir_i = 0; dir_j = 1;   /* xy */
    }
    else if (dir == 1)
    {
      dir_i = 0; dir_j = 2;   /* xz */
    }
    else
    {
      dir_i = 1; dir_j = 2;   /* yz */
    }

    /* set the origin using the slice center from IOUtil */
    memset (origin, 0, sizeof (origin));
    if (gdata.grouptype == CCTK_GF)
    {
      origin[maxdir-dir-1] = myGH->sp2xyz[gdata.dim - 1][dir];
    }

    /* set the direction vector */
    memset (direction, 0, sizeof (direction));
    direction[dir_i] = direction[gdata.dim + dir_j] = 1;

    mapping = Hyperslab_GlobalMappingByIndex (GH, vindex, 2,
                                              direction, origin, extent,
                                              NULL, -1, NULL, hsize);
    if (mapping < 0)
    {
      CCTK_VWarn (1, __LINE__, __FILE__, CCTK_THORNSTRING,
                  "Failed to define hyperslab mapping for variable '%s'",
                  fullname);
      continue;
    }
    total_hsize = hsize[0] * hsize[1] * CCTK_VarTypeSize (gdata.vartype);
    if (total_hsize <= 0)
    {
      CCTK_VWarn (1, __LINE__, __FILE__, CCTK_THORNSTRING,
                  "Selected hyperslab has zero size for variable '%s' "
                  "direction %d", fullname, dir);
      Hyperslab_FreeMapping (mapping);
      continue;
    }

    /* allocate hyperslab buffer */
    hdata = myproc == 0 ? malloc (total_hsize) : NULL;

    /* get the hyperslab */
    i = Hyperslab_Get (GH, mapping, 0, vindex, 0, htype, hdata);
    if (i)
    {
      CCTK_VWarn (1, __LINE__, __FILE__, CCTK_THORNSTRING,
                  "Failed to extract hyperslab for variable '%s'", fullname);
    }

    /* release the mapping structure */
    Hyperslab_FreeMapping (mapping);

    /* and dump the data to file */
    if (myproc == 0)
    {
      if (i == 0)
      {
        /* refine the 2D slice if requested */
        outdata = refinement_factor > 1 ? RefineData (hsize, hdata) : hdata;
        if (! outdata)
        {
          CCTK_WARN (1, "Failed to refine 2D array");
          outdata = hdata;
        }
        WriteData (GH, vindex, alias, gdata.dim, dir, min, max, hsize, outdata);
        if (outdata != hdata)
        {
          free (outdata);
        }
      }

      /* clean up */
      free (hdata);
    }
  } /* end of looping through xyz directions */

  free (fullname);

  return (0);
}


/********************************************************************
 ********************    Internal Routines   ************************
 ********************************************************************/
/*@@
   @routine    RefineData
   @date       Thu 4 November 2004
   @author     Thomas Radke
   @desc
               Refines a given 2D input array by a certain factor
   @enddesc

   @returntype void *
   @returndesc
               a pointer to the allocated refined output array (must be freed
               by the caller), or NULL in case of an error
   @endreturndesc
 @@*/
static void *RefineData (CCTK_INT input_dims[2], const void *input_data)
{
  const CCTK_REAL coord_origin[2] = {0.0, 0.0};
  CCTK_REAL coord_delta[2];
  const CCTK_INT array_type_codes[2] = {CCTK_VARIABLE_REAL, CCTK_VARIABLE_REAL};
  CCTK_REAL *interp_coords[2], *refined_data;
  int i, j, interp_handle, table_handle, N_interp_points;
  CCTK_INT output_dims[2];
  DECLARE_CCTK_PARAMETERS


  interp_handle = CCTK_InterpHandle ("uniform cartesian");
  if (interp_handle < 0)
  {
    CCTK_WARN (1, "Couldn't get handle for interpolation operator 'uniform "
               "cartesian'. Did you forget to activate a thorn providing "
               "CCTK_InterpLocalUniform() ?");
    return (NULL);
  }

  table_handle = Util_TableCreateFromString ("order = 1");
  coord_delta[0] = coord_delta[1] = refinement_factor;

  /* leave one grid point at the boundary as interpolation stencil */
  output_dims[0] = refinement_factor * (input_dims[0] - 1) - 2;
  output_dims[1] = refinement_factor * (input_dims[1] - 1) - 2;
  N_interp_points = output_dims[0] * output_dims[1];

  interp_coords[0] = malloc (2 * N_interp_points * sizeof (CCTK_REAL));
  interp_coords[1] = interp_coords[0] + N_interp_points;
  for (j = 0; j < output_dims[1]; j++)
  {
    for (i = 0; i < output_dims[0]; i++)
    {
      *interp_coords[0]++ = i + 1;
      *interp_coords[1]++ = j + 1;
    }
  }
  interp_coords[0] -= N_interp_points;
  interp_coords[1] -= N_interp_points;

  refined_data = malloc (N_interp_points * sizeof (CCTK_REAL));
  if (CCTK_InterpLocalUniform (2, interp_handle, table_handle,
                               coord_origin, coord_delta, N_interp_points,
                               CCTK_VARIABLE_REAL,
                               (const void *const *) interp_coords,
                               1, input_dims, array_type_codes,
                               &input_data, 1, array_type_codes,
                               (void *const *) &refined_data) != 0)
  {
    CCTK_WARN (1, "Failed to interpolate 2D array");
    free (refined_data);
    refined_data = NULL;
  }
  else
  {
    input_dims[0] = output_dims[0];
    input_dims[1] = output_dims[1];
  }

  free (interp_coords[0]);
  Util_TableDestroy (table_handle);

  return (refined_data);
}


/*@@
   @routine    WriteData
   @date       Thu 18 April 2002
   @author     Thomas Radke
   @desc
               Writes the given hyperslab into a Jpeg output file.
   @enddesc
 @@*/
static void WriteData (const cGH *GH, int vindex, const char *alias, int dim,
                       int dir, CCTK_REAL min, CCTK_REAL max,
                       const CCTK_INT hsize[2], const void *hdata)
{
  FILE *file;
  unsigned char *dataout;
  const ioJpegGH *myGH;
  ioAdvertisedFileDesc advertised_file;
  char *filename, *fullname;
  char slicename[30];
  const char *extensions[] = {"xy", "xz", "yz"};
  DECLARE_CCTK_PARAMETERS


  myGH = (const ioJpegGH *) CCTK_GHExtension (GH, "IOJpeg");

  /* allocate the RGB image buffer */
  dataout = (unsigned char *) malloc (3 * hsize[0] * hsize[1]);

  AutoColorDataSlice (hsize[0], hsize[1], hdata, dataout, min, max,
                      colormap_bias, colormap_factor);

  /* open the file */
  if (dim == 2)
  {
    strcpy (slicename, "2D");
  }
  else
  {
    /* give the slice origin as range [1 .. n] */
    sprintf (slicename, "%s_[%d]", extensions[dir], myGH->sp2xyz[dim-1][dir]);
  }

  filename = (char *) malloc (strlen (myGH->out_dir) + strlen (alias) +
                              sizeof (slicename) + 20);

  if (CCTK_Equals (mode, "remove"))
  {
    sprintf (filename, "%s%s_%s.jpeg", myGH->out_dir, alias, slicename);
  }
  else
  {
    sprintf (filename, "%s%s_%s.it_%d.jpeg", myGH->out_dir, alias, slicename,
             GH->cctk_iteration);
  }

  file = fopen (filename, "w");
  if (file)
  {
    /* write the data */
    WriteJPEGToFileRGB (hsize[0], hsize[1], dataout, colormap_quality, file);

    /* advertise the file for downloading */
    if (CCTK_Equals (mode, "remove") && myGH->out_last[vindex] < 0)
    {
      fullname = CCTK_FullName (vindex);
      advertised_file.slice = slicename;
      advertised_file.thorn = CCTK_THORNSTRING;
      advertised_file.varname = fullname;
      advertised_file.description = "Jpegs of slices";
      advertised_file.mimetype = "image/jpeg";

      IOUtil_AdvertiseFile (GH, filename, &advertised_file);

      free (fullname);
    }

    /* close the file */
    fclose (file);
  }
  else
  {
    CCTK_VWarn (1, __LINE__, __FILE__, CCTK_THORNSTRING,
                "Cannot open IOJpeg output file '%s'", filename);
  }

  /* clean up */
  free (dataout);
  free (filename);
}