%headertop{
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "vikcoord.h"
#include "mapcoord.h"
#include "vik-map-type.h"
%}

%{
#ifdef HAVE_MATH_H
#include <math.h>
#endif

#include "download.h"
%}

%h{

%}

%{

static DownloadOptions terraserver_options = { NULL, 0, a_check_map_file };

#define TERRASERVER_SITE "terraserver-usa.com"
#define MARGIN_OF_ERROR 0.001

static int mpp_to_scale ( gdouble mpp, guint8 type )
{
  mpp *= 4;
  gint t = (gint) mpp;
  if ( ABS(mpp - t) > MARGIN_OF_ERROR )
    return FALSE;

  switch ( t ) {
    case 1: return (type == 4) ? 8 : 0;
    case 2: return (type == 4) ? 9 : 0;
    case 4: return (type != 2) ? 10 : 0;
    case 8: return 11;
    case 16: return 12;
    case 32: return 13;
    case 64: return 14;
    case 128: return 15;
    case 256: return 16;
    case 512: return 17;
    case 1024: return 18;
    case 2048: return 19;
    default: return 0;
  }
}

static gdouble scale_to_mpp ( gint scale )
{
  return pow(2,scale - 10);
}

%}

class Terraserver:Map:Type from Vik:Map:Type {
  private int type;

  override (Vik:Map:Type) gboolean
  coord_to_mapcoord ( Vik:Map:Type *self, const VikCoord *src, gdouble xmpp, gdouble ympp, MapCoord *dest )
  {
  int type = TERRASERVER_MAP_TYPE(self)->_priv->type;
  g_assert ( src->mode == VIK_COORD_UTM );

  if ( xmpp != ympp )
    return FALSE;

  dest->scale = mpp_to_scale ( xmpp, type );
  if ( ! dest->scale )
    return FALSE;

  dest->x = (gint)(((gint)(src->east_west))/(200*xmpp));
  dest->y = (gint)(((gint)(src->north_south))/(200*xmpp));
  dest->z = src->utm_zone;
  return TRUE;
  }

  override (Vik:Map:Type) void
  mapcoord_to_center_coord ( Vik:Map:Type *self, MapCoord *src, VikCoord *dest )
  {
  // FIXME: slowdown here!
  gdouble mpp = scale_to_mpp ( src->scale );
  dest->mode = VIK_COORD_UTM;
  dest->utm_zone = src->z;
  dest->east_west = ((src->x * 200) + 100) * mpp;
  dest->north_south = ((src->y * 200) + 100) * mpp;
  }

  override (Vik:Map:Type) int
   download ( Vik:Map:Type *self, MapCoord *src, const gchar *dest_fn )
  {
  int res = -1;
  int type = TERRASERVER_MAP_TYPE(self)->_priv->type;
  gchar *uri = g_strdup_printf ( "/tile.ashx?T=%d&S=%d&X=%d&Y=%d&Z=%d", type,
                                  src->scale, src->x, src->y, src->z );
  res = a_http_download_get_url ( TERRASERVER_SITE, uri, dest_fn, &terraserver_options );
  g_free ( uri );
  return(res);
  }
}