/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include "config.h"

#include <string.h>

#include <gdk/gdk.h>
#include "gdkx.h"

/* We emulate the GDK_SELECTION window properties by storing
 * it's data in a per-window hashtable.
 */

typedef struct {
  guchar *data;
  gint length;
  gint format;
  GdkAtom type;
} GdkSelProp;

static GHashTable *sel_prop_table = NULL;

void
gdk_selection_init (void)
{
  if (sel_prop_table == NULL)
    sel_prop_table = g_hash_table_new (g_int_hash, g_int_equal);
}

void
gdk_sel_prop_store (GdkWindow *owner,
		    GdkAtom    type,
		    gint       format,
		    guchar    *data,
		    gint       length)
{
  GdkSelProp *prop;

  prop = g_hash_table_lookup (sel_prop_table, &GDK_DRAWABLE_XID (owner));
  if (prop != NULL)
    {
      g_free (prop->data);
      g_hash_table_remove (sel_prop_table, &GDK_DRAWABLE_XID (owner));
    }
  prop = g_new (GdkSelProp, 1);
  prop->data = data;
  prop->length = length;
  prop->format = format;
  prop->type = type;
  g_hash_table_insert (sel_prop_table, &GDK_DRAWABLE_XID (owner), prop);
}

gint
gdk_selection_owner_set (GdkWindow *owner,
			 GdkAtom    selection,
			 guint32    time,
			 gint       send_event)
{
  gchar *sel_name;
  HWND xwindow;

  GDK_NOTE (SELECTION,
	    (sel_name = gdk_atom_name (selection),
	     g_print ("gdk_selection_owner_set: %#x %#x (%s)\n",
		      (owner ? GDK_DRAWABLE_XID (owner) : 0),
		      selection, sel_name),
	     g_free (sel_name)));

  if (selection != gdk_clipboard_atom)
    return FALSE;

  if (owner != NULL)
    xwindow = GDK_DRAWABLE_XID (owner);
  else
    xwindow = NULL;

  GDK_NOTE (SELECTION, g_print ("...OpenClipboard(%#x)\n", xwindow));
  if (!OpenClipboard (xwindow))
    {
      g_warning ("gdk_selection_owner_set: OpenClipboard failed");
      return FALSE;
    }
  GDK_NOTE (SELECTION, g_print ("...EmptyClipboard()\n"));
  if (!EmptyClipboard ())
    {
      g_warning ("gdk_selection_owner_set: EmptyClipboard failed");
      CloseClipboard ();
      return FALSE;
    }
#if 0
  /* No delayed rendering */
  if (xwindow != NULL)
    SetClipboardData (CF_TEXT, NULL);
#endif
  GDK_NOTE (SELECTION, g_print ("...CloseClipboard()\n"));
  if (!CloseClipboard ())
    {
      g_warning ("gdk_selection_owner_set: CloseClipboard failed");
      return FALSE;
    }
  if (owner != NULL)
    {
      /* Send ourselves an ersatz selection request message so that
       * gdk_property_change will be called to store the clipboard data.
       */
      SendMessage (xwindow, gdk_selection_request_msg,
		   selection, 0);
    }

  return TRUE;
}

GdkWindow*
gdk_selection_owner_get (GdkAtom selection)
{
  GdkWindow *window;
  gchar *sel_name;

#if 1
  /* XXX Hmm, gtk selections seem to work best with this. This causes
   * gtk to always get the clipboard contents from Windows, and not
   * from the editable's own stashed-away copy.
   */
  return NULL;
#else
  if (selection != gdk_clipboard_atom)
    window = NULL;
  else
    window = gdk_window_lookup (GetClipboardOwner ());

#endif

  GDK_NOTE (SELECTION,
	    (sel_name = gdk_atom_name (selection),
	     g_print ("gdk_selection_owner_get: %#x (%s) = %#x\n",
		      selection, sel_name,
		      (window ? GDK_DRAWABLE_XID (window) : 0)),
	     g_free (sel_name)));

  return window;
}

void
gdk_selection_convert (GdkWindow *requestor,
		       GdkAtom    selection,
		       GdkAtom    target,
		       guint32    time)
{
  HGLOBAL hdata;
  GdkSelProp *prop;
  guchar *ptr, *data, *datap, *p;
  guint i, length, slength;
  gchar *sel_name, *tgt_name;

  g_return_if_fail (requestor != NULL);
  if (GDK_DRAWABLE_DESTROYED (requestor))
    return;

  GDK_NOTE (SELECTION,
	    (sel_name = gdk_atom_name (selection),
	     tgt_name = gdk_atom_name (target),
	     g_print ("gdk_selection_convert: %#x %#x (%s) %#x (%s)\n",
		      GDK_DRAWABLE_XID (requestor), selection, sel_name, target, tgt_name),
	     g_free (sel_name),
	     g_free (tgt_name)));

  if (selection == gdk_clipboard_atom)
    {
      /* Converting the CLIPBOARD selection means he wants the
       * contents of the clipboard. Get the clipboard data,
       * and store it for later.
       */
      GDK_NOTE (SELECTION, g_print ("...OpenClipboard(%#x)\n",
				    GDK_DRAWABLE_XID (requestor)));
      if (!OpenClipboard (GDK_DRAWABLE_XID (requestor)))
	{
	  g_warning ("gdk_selection_convert: OpenClipboard failed");
	  return;
	}

      GDK_NOTE (SELECTION, g_print ("...GetClipboardData(CF_TEXT)\n"));
      if ((hdata = GetClipboardData (CF_TEXT)) != NULL)
	{
	  if ((ptr = GlobalLock (hdata)) != NULL)
	    {
	      length = GlobalSize (hdata);
	      
	      GDK_NOTE (SELECTION, g_print ("...got data: %d bytes: %.10s\n",
					    length, ptr));
	      
	      slength = 0;
	      p = ptr;
	      for (i = 0; i < length; i++)
		{
		  if (*p == '\0')
		    break;
		  else if (*p != '\r')
		    slength++;
		  p++;
		}
	      
	      data = datap = g_malloc (slength + 1);
	      p = ptr;
	      for (i = 0; i < length; i++)
		{
		  if (*p == '\0')
		    break;
		  else if (*p != '\r')
		    *datap++ = *p;
		  p++;
		}
	      *datap++ = '\0';
	      gdk_sel_prop_store (requestor, GDK_TARGET_STRING, 8,
				  data, strlen (data) + 1);
	      
	      GlobalUnlock (hdata);
	    }
	}
      GDK_NOTE (SELECTION, g_print ("...CloseClipboard()\n"));
      CloseClipboard ();


      /* Send ourselves an ersatz selection notify message so that we actually
       * fetch the data.
       */
      SendMessage (GDK_DRAWABLE_XID (requestor), gdk_selection_notify_msg, selection, target);
    }
  else if (selection == gdk_win32_dropfiles_atom)
    {
      /* This means he wants the names of the dropped files.
       * gdk_dropfiles_filter already has stored the text/uri-list
       * data, tempoarily on gdk_root_parent's selection "property".
       */
      GdkSelProp *prop;

      prop = g_hash_table_lookup (sel_prop_table, &gdk_root_parent->drawable.xwindow);

      if (prop != NULL)
	{
	  g_hash_table_remove (sel_prop_table, &gdk_root_parent->drawable.xwindow);
	  gdk_sel_prop_store (requestor, prop->type, prop->format,
			      prop->data, prop->length);
	  g_free (prop);
	  SendMessage (GDK_DRAWABLE_XID (requestor), gdk_selection_notify_msg, selection, target);
	}
    }
  else
    {
      g_warning ("gdk_selection_convert: General case not implemented");
    }
}

gint
gdk_selection_property_get (GdkWindow  *requestor,
			    guchar    **data,
			    GdkAtom    *ret_type,
			    gint       *ret_format)
{
  GdkSelProp *prop;

  g_return_val_if_fail (requestor != NULL, 0);
  g_return_val_if_fail (GDK_IS_WINDOW (requestor), 0);

  if (GDK_DRAWABLE_DESTROYED (requestor))
    return 0;
  
  GDK_NOTE (SELECTION, g_print ("gdk_selection_property_get: %#x\n",
				GDK_DRAWABLE_XID (requestor)));

  prop = g_hash_table_lookup (sel_prop_table, &GDK_DRAWABLE_XID (requestor));

  if (prop == NULL)
    {
      *data = NULL;
      return 0;
    }
  *data = g_malloc (prop->length);
  if (prop->length > 0)
    memmove (*data, prop->data, prop->length);
  if (ret_type)
    *ret_type = prop->type;
  if (ret_format)
    *ret_format = prop->format;

  return prop->length;
}

void
gdk_selection_property_delete (GdkWindow *window)
{
  GdkSelProp *prop;
  
  prop = g_hash_table_lookup (sel_prop_table, &GDK_DRAWABLE_XID (window));
  if (prop != NULL)
    {
      g_free (prop->data);
      g_hash_table_remove (sel_prop_table, &GDK_DRAWABLE_XID (window));
    }
  else
    g_warning ("huh?");
}

void
gdk_selection_send_notify (guint32  requestor,
			   GdkAtom  selection,
			   GdkAtom  target,
			   GdkAtom  property,
			   guint32  time)
{
  gchar *sel_name, *tgt_name, *prop_name;

  GDK_NOTE (SELECTION,
	    (sel_name = gdk_atom_name (selection),
	     tgt_name = gdk_atom_name (target),
	     prop_name = gdk_atom_name (property),
	     g_print ("gdk_selection_send_notify: %#x %#x (%s) %#x (%s) %#x (%s)\n",
		      requestor,
		      selection, sel_name,
		      target, tgt_name,
		      property, prop_name),
	     g_free (sel_name),
	     g_free (tgt_name),
	     g_free (prop_name)));

  /* Send ourselves a selection clear message so that gtk thinks we don't
   * have the selection, and will claim it anew when needed, and
   * we thus get a chance to store data in the Windows clipboard.
   * Otherwise, if a gtkeditable does a copy to clipboard several times
   * only the first one actually gets copied to the Windows clipboard,
   * as only he first one causes a call to gdk_property_change.
   *
   * Hmm, there is something fishy with this. Cut and paste inside the
   * same app didn't work, the gtkeditable immediately forgot the
   * clipboard contents in gtk_editable_selection_clear as a result of
   * this message. OTOH, when I changed gdk_selection_owner_get to
   * always return NULL, it works. Sigh.
   */

  SendMessage ((HWND) requestor, gdk_selection_clear_msg, selection, 0);
}

gint
gdk_text_property_to_text_list (GdkAtom  encoding,
				gint     format, 
				guchar  *text,
				gint     length,
				gchar ***list)
{
  GDK_NOTE (SELECTION,
	    g_print ("gdk_text_property_to_text_list not implemented\n"));
  
  return 0;
}

void
gdk_free_text_list (gchar **list)
{
  g_return_if_fail (list != NULL);

  /* ??? */
}

gint
gdk_string_to_compound_text (gchar   *str,
			     GdkAtom *encoding,
			     gint    *format,
			     guchar **ctext,
			     gint    *length)
{
  g_warning ("gdk_string_to_compound_text: Not implemented");

  return 0;
}

void
gdk_free_compound_text (guchar *ctext)
{
  g_warning ("gdk_free_compound_text: Not implemented");
}