#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <grass/G3d.h>

/*---------------------------------------------------------------------------*/

static void
retileNocache  (void *map, char *nameOut, int tileX, int tileY, int tileZ)

{
  void *map2;
  int x, y, z, saveType, nx, ny, nz;
  int typeIntern;
  char *data;
  int tileXsave, tileYsave, tileZsave;
  G3D_Region region;

  saveType = G3d_getFileType ();
  G3d_setFileType (G3d_fileTypeMap (map));
  G3d_getTileDimension (&tileXsave, &tileYsave, &tileZsave);
  G3d_setTileDimension (tileX, tileY, tileZ);
  typeIntern = G3d_tileTypeMap (map);
  G3d_getRegionStructMap (map, &region);

  map2 = G3d_openCellNew (nameOut, typeIntern, G3D_NO_CACHE, &region);

  if (map2 == NULL) G3d_fatalError ("G3d_retile: error in G3d_openCellNew");

  G3d_setFileType (saveType);
  G3d_setTileDimension (tileXsave, tileYsave, tileZsave);

  data = G3d_allocTiles (map2, 1);
  if (data == NULL)
    G3d_fatalError ("G3d_retile: error in G3d_allocTiles");

  G3d_getNofTilesMap (map2, &nx, &ny, &nz);

  for (z = 0; z < nz; z++) 
    for (y = 0; y < ny; y++)
      for (x = 0; x < nx; x++) {

	G3d_getBlock (map, x * tileX, y * tileY, z * tileZ, 
		      tileX, tileY, tileZ, data, typeIntern);
	if (! G3d_writeTile (map2, G3d_tile2tileIndex (map2, x, y, z), data,
			     typeIntern))
	  G3d_fatalError ("G3d_retileNocache: error in G3d_writeTile");
      }

  G3d_freeTiles (data);
  G3d_closeCell (map2);
}

/*---------------------------------------------------------------------------*/


/*!
 * \brief 
 *
 * Makes a copy of <em>map</em> with name <em>nameOut</em> which has
 * tile dimensions <em>tileX</em>, <em>tileY</em>, <em>tileZ</em>.
 * The source code can be found in <em>retile.c</em>.
 *
 *  \param map
 *  \param nameOut
 *  \param tileX
 *  \param tileY
 *  \param tileZ
 *  \return void
 */

void
G3d_retile  (void *map, char *nameOut, int tileX, int tileY, int tileZ)

{
  void *map2;
  double value;
  int x, y, z, saveType;
  int rows, cols, depths, typeIntern;
  int xTile, yTile, zTile;
  int xOffs, yOffs, zOffs, prev;
  int tileXsave, tileYsave, tileZsave;
  G3D_Region region;

  if (! G3d_tileUseCacheMap (map)) {
    retileNocache (map, nameOut, tileX, tileY, tileZ);
    return;
  }

  saveType = G3d_getFileType ();
  G3d_setFileType (G3d_fileTypeMap (map));
  G3d_getTileDimension (&tileXsave, &tileYsave, &tileZsave);
  G3d_setTileDimension (tileX, tileY, tileZ);

  typeIntern = G3d_tileTypeMap (map);
  G3d_getRegionStructMap (map, &region);

  map2 = G3d_openCellNew (nameOut, typeIntern, G3D_USE_CACHE_DEFAULT, &region);
  if (map2 == NULL) G3d_fatalError ("G3d_retile: error in G3d_openCellNew");

  G3d_setFileType (saveType);
  G3d_setTileDimension (tileXsave, tileYsave, tileZsave);

  G3d_coord2tileCoord (map2, 0, 0, 0,
		       &xTile, &yTile, &zTile, &xOffs, &yOffs, &zOffs);

  prev = zTile;

  x = 0;
  y = 0;

  G3d_getCoordsMap (map, &rows, &cols, &depths);

  for (z = 0; z < depths; z++) {
    G3d_coord2tileCoord (map2, x, y, z, &xTile, &yTile, &zTile, 
			 &xOffs, &yOffs, &zOffs);
    if (zTile > prev) {
      if (! G3d_flushAllTiles (map2))
	G3d_fatalError ("G3d_retile: error in G3d_flushAllTiles");
      prev++;
    }

    for (y = 0; y < rows; y++)
      for (x = 0; x < cols; x++) {

	G3d_getValueRegion (map, x, y, z, (char *)&value, typeIntern);
	if (! G3d_putValue(map2, x, y, z, (char *)&value, typeIntern))
	  G3d_fatalError ("G3d_retile: error in G3d_putValue");
      }
  }

  if (! G3d_flushAllTiles (map2))
    G3d_fatalError ("G3d_retile: error in G3d_flushAllTiles");
  if (! G3d_closeCell (map2))
    G3d_fatalError ("G3d_retile: error in G3d_closeCell");
}