/*
 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
 *
 * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

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


typedef struct {
  gpointer clipboard;
  gint pid;
  VikClipboardDataType type;
  gint subtype;
  guint16 layer_type;
  guint len;
  guint8 data[0];
} vik_clipboard_t;

static GtkTargetEntry target_table[] = {
  { "application/viking", 0, 0 },
  { "STRING", 0, 1 },
};

/*****************************************************************
 ** functions which send to the clipboard client (we are owner) **
 *****************************************************************/

static void clip_get ( GtkClipboard *c, GtkSelectionData *selection_data, guint info, gpointer p ) 
{
  vik_clipboard_t *vc = p;
  if (info==0) {
    //    g_print("clip_get: vc = %p, size = %d\n", vc, sizeof(*vc) + vc->len);
    gtk_selection_data_set ( selection_data, selection_data->target, 8, (void *)vc, sizeof(*vc) + vc->len );
  }
  if (info==1) {
    if (vc->type == VIK_CLIPBOARD_DATA_LAYER) {
      gtk_selection_data_set_text ( selection_data, VIK_LAYER(vc->clipboard)->name, -1 );
    } 
  }
}

static void clip_clear ( GtkClipboard *c, gpointer p )
{
  g_free(p);
}


/**************************************************************************
 ** functions which receive from the clipboard owner (we are the client) **
 **************************************************************************/

/* our own data type */
static void clip_receive_viking ( GtkClipboard *c, GtkSelectionData *sd, gpointer p ) 
{
  VikLayersPanel *vlp = p;
  vik_clipboard_t *vc;
  if (sd->length == -1) {
    g_warning ( "paste failed" );
    return;
  } 
  //  g_print("clip receive: target = %s, type = %s\n", gdk_atom_name(sd->target), gdk_atom_name(sd->type));
  g_assert(!strcmp(gdk_atom_name(sd->target), target_table[0].target));

  vc = (vik_clipboard_t *)sd->data;
  //  g_print("  sd->data = %p, sd->length = %d, vc->len = %d\n", sd->data, sd->length, vc->len);

  if (sd->length != sizeof(*vc) + vc->len) {
    g_warning ( "wrong clipboard data size" );
    return;
  }

  if ( vc->type == VIK_CLIPBOARD_DATA_LAYER )
  {
    VikLayer *new_layer = vik_layer_unmarshall ( vc->data, vc->len, vik_layers_panel_get_viewport(vlp) );
    vik_layers_panel_add_layer ( vlp, new_layer );
  }
  else if ( vc->type == VIK_CLIPBOARD_DATA_SUBLAYER )
  {
    VikLayer *sel = vik_layers_panel_get_selected ( vlp );
    if ( sel && sel->type == vc->layer_type)
    {
      if ( vik_layer_get_interface(vc->layer_type)->paste_item )
        vik_layer_get_interface(vc->layer_type)->paste_item ( sel, vc->subtype, vc->data, vc->len);
    }
    else
      a_dialog_error_msg_extra ( VIK_GTK_WINDOW_FROM_WIDGET(GTK_WIDGET(vlp)), "The clipboard contains sublayer data for a %s layers. You must select a layer of this type to paste the clipboard data.", vik_layer_get_interface(vc->layer_type)->name );
  }
}



/*
 * utility func to handle pasted text:
 * search for N dd.dddddd W dd.dddddd, N dd° dd.dddd W dd° dd.ddddd and so forth
 */
static gboolean clip_parse_latlon ( const gchar *text, struct LatLon *coord ) 
{
  gint latdeg, londeg;
  gdouble latm, lonm;
  gdouble lat, lon;
  gchar *cand;
  gint len, i;
  gchar *s = g_strdup(text);

  //  g_print("parsing %s\n", s);

  len = strlen(s);

  /* remove non-digits following digits; gets rid of degree symbols or whatever people use, and 
   * punctuation
   */
  for (i=0; i<len-2; i++) {
    if (g_ascii_isdigit (s[i]) && s[i+1] != '.' && !g_ascii_isdigit (s[i+1])) {
      s[i+1] = ' ';
      if (!g_ascii_isalnum (s[i+2]) && s[i+2] != '-') {
	s[i+2] = ' ';
      }
    }
  }

  /* now try reading coordinates */
  for (i=0; i<len; i++) {
    if (s[i] == 'N' || s[i] == 'S' || g_ascii_isdigit (s[i])) {
      gchar latc[2] = "SN";
      gchar lonc[2] = "WE";
      gint j, k;
      cand = s+i;

      for (j=0; j<2; j++) {
	for (k=0; k<2; k++) {
	  gchar fmt1[] = "N %d%*[ ]%lf W %d%*[ ]%lf";
	  gchar fmt2[] = "%d%*[ ]%lf N %d%*[ ]%lf W";
	  gchar fmt3[] = "N %lf W %lf";
	  gchar fmt4[] = "%lf N %lf W";

	  fmt1[0]  = latc[j];	  fmt1[13] = lonc[k];
	  fmt2[11] = latc[j];	  fmt2[24] = lonc[k];
	  fmt3[0]  = latc[j];	  fmt3[6]  = lonc[k];
	  fmt4[4]  = latc[j];	  fmt4[10] = lonc[k];

	  if (sscanf(cand, fmt1, &latdeg, &latm, &londeg, &lonm) == 4 ||
	      sscanf(cand, fmt2, &latdeg, &latm, &londeg, &lonm) == 4) {
	    lat = (j*2-1) * (latdeg + latm / 60);
	    lon = (k*2-1) * (londeg + lonm / 60);
	    break;
	  }
	  if (sscanf(cand, fmt3, &lat, &lon) == 2 ||
	      sscanf(cand, fmt4, &lat, &lon) == 2) {
	    lat *= (j*2-1);
	    lon *= (k*2-1);
	    break;
	  }
	}
	if (k!=2) break;
      }
      if (j!=2) break;

      if (sscanf(cand, "%d%*[ ]%lf %d%*[ ]%lf", &latdeg, &latm, &londeg, &lonm) == 4) {
	lat = latdeg/abs(latdeg) * (abs(latdeg) + latm / 60);
	lon = londeg/abs(londeg) * (abs(londeg) + lonm / 60);
	break;
      }
      if (sscanf(cand, "%lf %lf", &lat, &lon) == 2) {
	break;
      }
    }
  }
  g_free(s);

  /* did we get to the end without actually finding a coordinate? */
  if (i<len && lat >= -90.0 && lat <= 90.0 && lon >= -180.0 && lon <= 180.0) {
    coord->lat = lat;
    coord->lon = lon;
    return TRUE;
  }
  return FALSE;
}

static void clip_add_wp(VikLayersPanel *vlp, struct LatLon *coord) 
{
  VikCoord vc;
  VikLayer *sel = vik_layers_panel_get_selected ( vlp );


  vik_coord_load_from_latlon ( &vc, VIK_COORD_LATLON, coord );

  if (sel && sel->type == VIK_LAYER_TRW) {
    vik_trw_layer_new_waypoint ( VIK_TRW_LAYER(sel), VIK_GTK_WINDOW_FROM_LAYER(sel), &vc );
  } else {
    a_dialog_error_msg_extra ( VIK_GTK_WINDOW_FROM_WIDGET(GTK_WIDGET(vlp)), "In order to paste a waypoint, please select an appropriate layer to paste into.", NULL);
  }
}

static void clip_receive_text (GtkClipboard *c, const gchar *text, gpointer p)
{
  VikLayersPanel *vlp = p;
  struct LatLon coord;
  //  g_print("got text: %s\n", text);
  if (clip_parse_latlon(text, &coord)) {
    clip_add_wp(vlp, &coord);
  }
}

static void clip_receive_html ( GtkClipboard *c, GtkSelectionData *sd, gpointer p ) 
{
  VikLayersPanel *vlp = p;
  gsize r, w;
  GError *err = NULL;
  gchar *s, *span;
  gint tag = 0, i;
  struct LatLon coord;

  if (sd->length == -1) {
    return;
  } 

  /* - copying from Mozilla seems to give html in UTF-16. */
  if (!(s =  g_convert ( (gchar *)sd->data, sd->length, "UTF-8", "UTF-16", &r, &w, &err))) {
    return;
  }
  //  g_print("html is %d bytes long: %s\n", sd->length, s);

  /* scrape a coordinate pasted from a geocaching.com page: look for a 
   * telltale tag if possible, and then remove tags 
   */
  if (!(span = g_strstr_len(s, w, "<span id=\"LatLon\">"))) {
    span = s;
  }
  for (i=0; i<strlen(span); i++) {
    gchar c = span[i];
    if (c == '<') {
      tag++;
    }
    if (tag>0) {
      span[i] = ' ';
    }
    if (c == '>') {
      if (tag>0) tag--;
    }
  }
  if (clip_parse_latlon(span, &coord)) {
    clip_add_wp(vlp, &coord);
  }

  g_free(s);
}

/*
 * deal with various data types a clipboard may hold 
 */
void clip_receive_targets ( GtkClipboard *c, GdkAtom *a, gint n, gpointer p )
{
  VikLayersPanel *vlp = p;
  gint i;

  /*  g_print("got targets\n"); */
  for (i=0; i<n; i++) {
    /* g_print("  ""%s""\n", gdk_atom_name(a[i])); */
    if (!strcmp(gdk_atom_name(a[i]), "text/html")) {
      gtk_clipboard_request_contents ( c, gdk_atom_intern("text/html", TRUE), clip_receive_html, vlp );
      break;
    }
    if (a[i] == GDK_TARGET_STRING) {
      gtk_clipboard_request_text ( c, clip_receive_text, vlp );
      break;
    }
    if (!strcmp(gdk_atom_name(a[i]), "application/viking")) {
      gtk_clipboard_request_contents ( c, gdk_atom_intern("application/viking", TRUE), clip_receive_viking, vlp );
      break;
    }
  }
}

/*********************************************************************************
 ** public functions                                                            **
 *********************************************************************************/

/* 
 * make a copy of selected object and associate ourselves with the clipboard
 */
void a_clipboard_copy_selected ( VikLayersPanel *vlp )
{
  VikLayer *sel = vik_layers_panel_get_selected ( vlp );
  GtkTreeIter iter;
  VikClipboardDataType type;
  guint16 layer_type = 0;
  gint subtype = 0;
  guint8 *data = NULL;
  guint len;

  if ( ! sel )
    return;

  vik_treeview_get_selected_iter ( sel->vt, &iter );

  if ( vik_treeview_item_get_type ( sel->vt, &iter ) == VIK_TREEVIEW_TYPE_SUBLAYER ) {
    type = VIK_CLIPBOARD_DATA_SUBLAYER;
    layer_type = sel->type;
    if ( vik_layer_get_interface(layer_type)->copy_item) {
      subtype = vik_treeview_item_get_data(sel->vt, &iter);
      vik_layer_get_interface(layer_type)->copy_item(sel, subtype, vik_treeview_item_get_pointer(sel->vt, &iter), &data, &len );
    }    
  }
  else
  {
    type = VIK_CLIPBOARD_DATA_LAYER;
    vik_layer_marshall ( sel, &data, &len );
  }

  if (data)
    a_clipboard_copy( type, layer_type, subtype, len, data);

}

void a_clipboard_copy( VikClipboardDataType type, guint16 layer_type, gint subtype, guint len, guint8 * data)
{
  vik_clipboard_t * vc = g_malloc(sizeof(*vc) + len);
  GtkClipboard *c = gtk_clipboard_get ( GDK_SELECTION_CLIPBOARD );

  vc->type = type;
  vc->layer_type = layer_type;
  vc->subtype = subtype;
  vc->len = len;
  memcpy(vc->data, data, len);
  g_free(data);
  vc->pid = getpid();
  gtk_clipboard_set_with_data ( c, target_table, G_N_ELEMENTS(target_table), clip_get, clip_clear, vc );
}

/*
 * to deal with multiple data types, we first request the type of data on the clipboard,
 * and handle them in the callback
 */
gboolean a_clipboard_paste ( VikLayersPanel *vlp )
{
  GtkClipboard *c = gtk_clipboard_get ( GDK_SELECTION_CLIPBOARD );
  gtk_clipboard_request_targets ( c, clip_receive_targets, vlp );
  return TRUE;
}