/* GTK - The GIMP Toolkit
 * 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 Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* By Owen Taylor <otaylor@gtk.org>              98/4/4 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  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/gdkkeysyms.h"
#include "gtkmain.h"
#include "gtkmarshalers.h"
#include "gtkwindow.h"
#include "gtkplug.h"
#include "gtkprivate.h"
#include "gtksocket.h"
#include "gtksocketprivate.h"
#include "gtkdnd.h"

#include "x11/gdkx.h"

#ifdef HAVE_XFIXES
#include <X11/extensions/Xfixes.h>
#endif

#include "gtkxembed.h"
#include "gtkalias.h"

static gboolean xembed_get_info     (GdkWindow     *gdk_window,
				     unsigned long *version,
				     unsigned long *flags);

/* From Tk */
#define EMBEDDED_APP_WANTS_FOCUS NotifyNormal+20

GdkNativeWindow
_gtk_socket_windowing_get_id (GtkSocket *socket)
{
  return GDK_WINDOW_XWINDOW (GTK_WIDGET (socket)->window);
}

void
_gtk_socket_windowing_realize_window (GtkSocket *socket)
{
  GdkWindow *window = GTK_WIDGET (socket)->window;
  XWindowAttributes xattrs;

  XGetWindowAttributes (GDK_WINDOW_XDISPLAY (window),
			GDK_WINDOW_XWINDOW (window),
			&xattrs);

  XSelectInput (GDK_WINDOW_XDISPLAY (window),
		GDK_WINDOW_XWINDOW (window), 
		xattrs.your_event_mask | 
		SubstructureNotifyMask | SubstructureRedirectMask);
}

void
_gtk_socket_windowing_end_embedding_toplevel (GtkSocket *socket)
{
  gtk_window_remove_embedded_xid (GTK_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (socket))),
				  GDK_WINDOW_XWINDOW (socket->plug_window));
}

void
_gtk_socket_windowing_size_request (GtkSocket *socket)
{
  XSizeHints hints;
  long supplied;
	  
  gdk_error_trap_push ();

  socket->request_width = 1;
  socket->request_height = 1;
	  
  if (XGetWMNormalHints (GDK_WINDOW_XDISPLAY (socket->plug_window),
			 GDK_WINDOW_XWINDOW (socket->plug_window),
			 &hints, &supplied))
    {
      if (hints.flags & PMinSize)
	{
	  socket->request_width = MAX (hints.min_width, 1);
	  socket->request_height = MAX (hints.min_height, 1);
	}
      else if (hints.flags & PBaseSize)
	{
	  socket->request_width = MAX (hints.base_width, 1);
	  socket->request_height = MAX (hints.base_height, 1);
	}
    }
  socket->have_size = TRUE;
  
  gdk_error_trap_pop ();
}

void
_gtk_socket_windowing_send_key_event (GtkSocket *socket,
				      GdkEvent  *gdk_event,
				      gboolean   mask_key_presses)
{
  XKeyEvent xkey;
  GdkScreen *screen = gdk_drawable_get_screen (socket->plug_window);

  memset (&xkey, 0, sizeof (xkey));
  xkey.type = (gdk_event->type == GDK_KEY_PRESS) ? KeyPress : KeyRelease;
  xkey.window = GDK_WINDOW_XWINDOW (socket->plug_window);
  xkey.root = GDK_WINDOW_XWINDOW (gdk_screen_get_root_window (screen));
  xkey.subwindow = None;
  xkey.time = gdk_event->key.time;
  xkey.x = 0;
  xkey.y = 0;
  xkey.x_root = 0;
  xkey.y_root = 0;
  xkey.state = gdk_event->key.state;
  xkey.keycode = gdk_event->key.hardware_keycode;
  xkey.same_screen = True;/* FIXME ? */

  gdk_error_trap_push ();
  XSendEvent (GDK_WINDOW_XDISPLAY (socket->plug_window),
	      GDK_WINDOW_XWINDOW (socket->plug_window),
	      False,
	      (mask_key_presses ? KeyPressMask : NoEventMask),
	      (XEvent *)&xkey);
  gdk_display_sync (gdk_screen_get_display (screen));
  gdk_error_trap_pop ();
}

void
_gtk_socket_windowing_focus_change (GtkSocket *socket,
				    gboolean   focus_in)
{
  if (focus_in)
    _gtk_xembed_send_focus_message (socket->plug_window,
				    XEMBED_FOCUS_IN, XEMBED_FOCUS_CURRENT);
  else
    _gtk_xembed_send_message (socket->plug_window,
			      XEMBED_FOCUS_OUT, 0, 0, 0);
}

void
_gtk_socket_windowing_update_active (GtkSocket *socket,
				     gboolean   active)
{
  _gtk_xembed_send_message (socket->plug_window,
			    active ? XEMBED_WINDOW_ACTIVATE : XEMBED_WINDOW_DEACTIVATE,
			    0, 0, 0);
}

void
_gtk_socket_windowing_update_modality (GtkSocket *socket,
				       gboolean   modality)
{
  _gtk_xembed_send_message (socket->plug_window,
			    modality ? XEMBED_MODALITY_ON : XEMBED_MODALITY_OFF,
			    0, 0, 0);
}

void
_gtk_socket_windowing_focus (GtkSocket       *socket,
			     GtkDirectionType direction)
{
  gint detail = -1;

  switch (direction)
    {
    case GTK_DIR_UP:
    case GTK_DIR_LEFT:
    case GTK_DIR_TAB_BACKWARD:
      detail = XEMBED_FOCUS_LAST;
      break;
    case GTK_DIR_DOWN:
    case GTK_DIR_RIGHT:
    case GTK_DIR_TAB_FORWARD:
      detail = XEMBED_FOCUS_FIRST;
      break;
    }
  
  _gtk_xembed_send_focus_message (socket->plug_window, XEMBED_FOCUS_IN, detail);
}

void
_gtk_socket_windowing_send_configure_event (GtkSocket *socket)
{
  XConfigureEvent xconfigure;
  gint x, y;

  g_return_if_fail (socket->plug_window != NULL);

  memset (&xconfigure, 0, sizeof (xconfigure));
  xconfigure.type = ConfigureNotify;

  xconfigure.event = GDK_WINDOW_XWINDOW (socket->plug_window);
  xconfigure.window = GDK_WINDOW_XWINDOW (socket->plug_window);

  /* The ICCCM says that synthetic events should have root relative
   * coordinates. We still aren't really ICCCM compliant, since
   * we don't send events when the real toplevel is moved.
   */
  gdk_error_trap_push ();
  gdk_window_get_origin (socket->plug_window, &x, &y);
  gdk_error_trap_pop ();
			 
  xconfigure.x = x;
  xconfigure.y = y;
  xconfigure.width = GTK_WIDGET(socket)->allocation.width;
  xconfigure.height = GTK_WIDGET(socket)->allocation.height;

  xconfigure.border_width = 0;
  xconfigure.above = None;
  xconfigure.override_redirect = False;

  gdk_error_trap_push ();
  XSendEvent (GDK_WINDOW_XDISPLAY (socket->plug_window),
	      GDK_WINDOW_XWINDOW (socket->plug_window),
	      False, NoEventMask, (XEvent *)&xconfigure);
  gdk_display_sync (gtk_widget_get_display (GTK_WIDGET (socket)));
  gdk_error_trap_pop ();
}

void
_gtk_socket_windowing_select_plug_window_input (GtkSocket *socket)
{
  XSelectInput (GDK_DISPLAY_XDISPLAY (gtk_widget_get_display (GTK_WIDGET (socket))),
		GDK_WINDOW_XWINDOW (socket->plug_window),
		StructureNotifyMask | PropertyChangeMask);
}

void
_gtk_socket_windowing_embed_get_info (GtkSocket *socket)
{
  unsigned long version;
  unsigned long flags;

  socket->xembed_version = -1;
  if (xembed_get_info (socket->plug_window, &version, &flags))
    {
      socket->xembed_version = MIN (GTK_XEMBED_PROTOCOL_VERSION, version);
      socket->is_mapped = (flags & XEMBED_MAPPED) != 0;
    }
  else
    {
      /* FIXME, we should probably actually check the state before we started */
      socket->is_mapped = TRUE;
    }
}

void
_gtk_socket_windowing_embed_notify (GtkSocket *socket)
{
#ifdef HAVE_XFIXES
  GdkDisplay *display = gtk_widget_get_display (GTK_WIDGET (socket));

  XFixesChangeSaveSet (GDK_DISPLAY_XDISPLAY (display),
		       GDK_WINDOW_XWINDOW (socket->plug_window),
		       SetModeInsert, SaveSetRoot, SaveSetUnmap);
#endif
  _gtk_xembed_send_message (socket->plug_window,
			    XEMBED_EMBEDDED_NOTIFY, 0,
			    GDK_WINDOW_XWINDOW (GTK_WIDGET (socket)->window),
			    socket->xembed_version);
}

static gboolean
xembed_get_info (GdkWindow     *window,
		 unsigned long *version,
		 unsigned long *flags)
{
  GdkDisplay *display = gdk_drawable_get_display (window);
  Atom xembed_info_atom = gdk_x11_get_xatom_by_name_for_display (display, "_XEMBED_INFO");
  Atom type;
  int format;
  unsigned long nitems, bytes_after;
  unsigned char *data;
  unsigned long *data_long;
  int status;
  
  gdk_error_trap_push();
  status = XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display),
			       GDK_WINDOW_XWINDOW (window),
			       xembed_info_atom,
			       0, 2, False,
			       xembed_info_atom, &type, &format,
			       &nitems, &bytes_after, &data);
  gdk_error_trap_pop();

  if (status != Success)
    return FALSE;		/* Window vanished? */

  if (type == None)		/* No info property */
    return FALSE;

  if (type != xembed_info_atom)
    {
      g_warning ("_XEMBED_INFO property has wrong type\n");
      return FALSE;
    }
  
  if (nitems < 2)
    {
      g_warning ("_XEMBED_INFO too short\n");
      XFree (data);
      return FALSE;
    }
  
  data_long = (unsigned long *)data;
  if (version)
    *version = data_long[0];
  if (flags)
    *flags = data_long[1] & XEMBED_MAPPED;
  
  XFree (data);
  return TRUE;
}

gboolean
_gtk_socket_windowing_embed_get_focus_wrapped (void)
{
  return _gtk_xembed_get_focus_wrapped ();
}

void
_gtk_socket_windowing_embed_set_focus_wrapped (void)
{
  _gtk_xembed_set_focus_wrapped ();
}

static void
handle_xembed_message (GtkSocket        *socket,
		       XEmbedMessageType message,
		       glong             detail,
		       glong             data1,
		       glong             data2,
		       guint32           time)
{
  GTK_NOTE (PLUGSOCKET,
	    g_message ("GtkSocket: %s received", _gtk_xembed_message_name (message)));
  
  switch (message)
    {
    case XEMBED_EMBEDDED_NOTIFY:
    case XEMBED_WINDOW_ACTIVATE:
    case XEMBED_WINDOW_DEACTIVATE:
    case XEMBED_MODALITY_ON:
    case XEMBED_MODALITY_OFF:
    case XEMBED_FOCUS_IN:
    case XEMBED_FOCUS_OUT:
      g_warning ("GtkSocket: Invalid _XEMBED message %s received", _gtk_xembed_message_name (message));
      break;
      
    case XEMBED_REQUEST_FOCUS:
      _gtk_socket_claim_focus (socket, TRUE);
      break;

    case XEMBED_FOCUS_NEXT:
    case XEMBED_FOCUS_PREV:
      _gtk_socket_advance_toplevel_focus (socket,
					  (message == XEMBED_FOCUS_NEXT ?
					   GTK_DIR_TAB_FORWARD : GTK_DIR_TAB_BACKWARD));
      break;
      
    case XEMBED_GTK_GRAB_KEY:
      _gtk_socket_add_grabbed_key (socket, data1, data2);
      break; 
    case XEMBED_GTK_UNGRAB_KEY:
      _gtk_socket_remove_grabbed_key (socket, data1, data2);
      break;

    case XEMBED_GRAB_KEY:
    case XEMBED_UNGRAB_KEY:
      break;
      
    default:
      GTK_NOTE (PLUGSOCKET,
		g_message ("GtkSocket: Ignoring unknown _XEMBED message of type %d", message));
      break;
    }
}

GdkFilterReturn
_gtk_socket_windowing_filter_func (GdkXEvent *gdk_xevent,
				   GdkEvent  *event,
				   gpointer   data)
{
  GtkSocket *socket;
  GtkWidget *widget;
  GdkDisplay *display;
  XEvent *xevent;

  GdkFilterReturn return_val;
  
  socket = GTK_SOCKET (data);

  return_val = GDK_FILTER_CONTINUE;

  if (socket->plug_widget)
    return return_val;

  widget = GTK_WIDGET (socket);
  xevent = (XEvent *)gdk_xevent;
  display = gtk_widget_get_display (widget);

  switch (xevent->type)
    {
    case ClientMessage:
      if (xevent->xclient.message_type == gdk_x11_get_xatom_by_name_for_display (display, "_XEMBED"))
	{
	  _gtk_xembed_push_message (xevent);
	  handle_xembed_message (socket,
				 xevent->xclient.data.l[1],
				 xevent->xclient.data.l[2],
				 xevent->xclient.data.l[3],
				 xevent->xclient.data.l[4],
				 xevent->xclient.data.l[0]);
	  _gtk_xembed_pop_message ();
	  
	  return_val = GDK_FILTER_REMOVE;
	}
      break;

    case CreateNotify:
      {
	XCreateWindowEvent *xcwe = &xevent->xcreatewindow;

	if (!socket->plug_window)
	  {
	    _gtk_socket_add_window (socket, xcwe->window, FALSE);

	    if (socket->plug_window)
	      {
		GTK_NOTE (PLUGSOCKET, g_message ("GtkSocket - window created"));
	      }
	  }
	
	return_val = GDK_FILTER_REMOVE;
	
	break;
      }

    case ConfigureRequest:
      {
	XConfigureRequestEvent *xcre = &xevent->xconfigurerequest;
	
	if (!socket->plug_window)
	  _gtk_socket_add_window (socket, xcre->window, FALSE);
	
	if (socket->plug_window)
	  {
	    GtkSocketPrivate *private = _gtk_socket_get_private (socket);
	    
	    if (xcre->value_mask & (CWWidth | CWHeight))
	      {
		GTK_NOTE (PLUGSOCKET,
			  g_message ("GtkSocket - configure request: %d %d",
				     socket->request_width,
				     socket->request_height));

		private->resize_count++;
		gtk_widget_queue_resize (widget);
	      }
	    else if (xcre->value_mask & (CWX | CWY))
	      {
		_gtk_socket_windowing_send_configure_event (socket);
	      }
	    /* Ignore stacking requests. */
	    
	    return_val = GDK_FILTER_REMOVE;
	  }
	break;
      }

    case DestroyNotify:
      {
	XDestroyWindowEvent *xdwe = &xevent->xdestroywindow;

	/* Note that we get destroy notifies both from SubstructureNotify on
	 * our window and StructureNotify on socket->plug_window
	 */
	if (socket->plug_window && (xdwe->window == GDK_WINDOW_XWINDOW (socket->plug_window)))
	  {
	    gboolean result;
	    
	    GTK_NOTE (PLUGSOCKET, g_message ("GtkSocket - destroy notify"));
	    
	    gdk_window_destroy_notify (socket->plug_window);
	    _gtk_socket_end_embedding (socket);

	    g_object_ref (widget);
	    g_signal_emit_by_name (widget, "plug_removed", &result);
	    if (!result)
	      gtk_widget_destroy (widget);
	    g_object_unref (widget);
	    
	    return_val = GDK_FILTER_REMOVE;
	  }
	break;
      }

    case FocusIn:
      if (xevent->xfocus.mode == EMBEDDED_APP_WANTS_FOCUS)
	{
	  _gtk_socket_claim_focus (socket, TRUE);
	}
      return_val = GDK_FILTER_REMOVE;
      break;
    case FocusOut:
      return_val = GDK_FILTER_REMOVE;
      break;
    case MapRequest:
      if (!socket->plug_window)
	{
	  _gtk_socket_add_window (socket, xevent->xmaprequest.window, FALSE);
	}
	
      if (socket->plug_window)
	{
	  GTK_NOTE (PLUGSOCKET, g_message ("GtkSocket - Map Request"));

	  _gtk_socket_handle_map_request (socket);
	  return_val = GDK_FILTER_REMOVE;
	}
      break;
    case PropertyNotify:
      if (socket->plug_window &&
	  xevent->xproperty.window == GDK_WINDOW_XWINDOW (socket->plug_window))
	{
	  GdkDragProtocol protocol;

	  if (xevent->xproperty.atom == gdk_x11_get_xatom_by_name_for_display (display, "WM_NORMAL_HINTS"))
	    {
	      GTK_NOTE (PLUGSOCKET, g_message ("GtkSocket - received PropertyNotify for plug's WM_NORMAL_HINTS"));
	      socket->have_size = FALSE;
	      gtk_widget_queue_resize (widget);
	      return_val = GDK_FILTER_REMOVE;
	    }
	  else if ((xevent->xproperty.atom == gdk_x11_get_xatom_by_name_for_display (display, "XdndAware")) ||
	      (xevent->xproperty.atom == gdk_x11_get_xatom_by_name_for_display (display, "_MOTIF_DRAG_RECEIVER_INFO")))
	    {
	      gdk_error_trap_push ();
	      if (gdk_drag_get_protocol_for_display (display,
						     xevent->xproperty.window,
						     &protocol))
		gtk_drag_dest_set_proxy (GTK_WIDGET (socket),
					 socket->plug_window,
					 protocol, TRUE);

	      gdk_display_sync (display);
	      gdk_error_trap_pop ();
	      return_val = GDK_FILTER_REMOVE;
	    }
	  else if (xevent->xproperty.atom == gdk_x11_get_xatom_by_name_for_display (display, "_XEMBED_INFO"))
	    {
	      unsigned long flags;
	      
	      if (xembed_get_info (socket->plug_window, NULL, &flags))
		{
		  gboolean was_mapped = socket->is_mapped;
		  gboolean is_mapped = (flags & XEMBED_MAPPED) != 0;

		  if (was_mapped != is_mapped)
		    {
		      if (is_mapped)
			_gtk_socket_handle_map_request (socket);
		      else
			{
			  gdk_error_trap_push ();
			  gdk_window_show (socket->plug_window);
			  gdk_flush ();
			  gdk_error_trap_pop ();
			  
			  _gtk_socket_unmap_notify (socket);
			}
		    }
		}
	      return_val = GDK_FILTER_REMOVE;
	    }
	}
      break;
    case ReparentNotify:
      {
	XReparentEvent *xre = &xevent->xreparent;

	GTK_NOTE (PLUGSOCKET, g_message ("GtkPlug: ReparentNotify received\n"));
	if (!socket->plug_window && xre->parent == GDK_WINDOW_XWINDOW (widget->window))
	  {
	    _gtk_socket_add_window (socket, xre->window, FALSE);
	    
	    if (socket->plug_window)
	      {
		GTK_NOTE (PLUGSOCKET, g_message ("GtkSocket - window reparented"));
	      }
	    
	    return_val = GDK_FILTER_REMOVE;
	  }
	
	break;
      }
    case UnmapNotify:
      if (socket->plug_window &&
	  xevent->xunmap.window == GDK_WINDOW_XWINDOW (socket->plug_window))
	{
	  GTK_NOTE (PLUGSOCKET, g_message ("GtkSocket - Unmap notify"));

	  _gtk_socket_unmap_notify (socket);
	  return_val = GDK_FILTER_REMOVE;
	}
      break;
      
    }
  
  return return_val;
}