/* External client widget.
   Copyright (C) 1993, 1994 Sun Microsystems, Inc.

This library 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 3 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 General Public License
for more details.

You should have received a copy of the GNU General Public License
along with this library.  If not, see <http://www.gnu.org/licenses/>. */

/* Synched up with: Not in FSF. */

/* Written by Ben Wing, September 1993. */

#ifdef emacs

#include <config.h>

#ifndef EXTERNAL_WIDGET
ERROR!  This ought not be getting compiled if EXTERNAL_WIDGET is undefined
#endif

#endif /* emacs */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#ifdef EXTW_USES_MOTIF
# include <Xm/XmP.h>
# include <Xm/PrimitiveP.h>
# include <X11/keysym.h>
#else
# include "xintrinsicp.h"
# include <X11/StringDefs.h>
#endif

#include "compiler.h"
#include "ExternalClientP.h"
#include "extw-Xt.h"

#ifdef TOOLTALK
#include TT_C_H_FILE
#endif

/* This is the client widget, used to communicate with an ExternalShell
   widget. */

#define NOTIFY(w, type, l0, l1, l2) \
  extw_send_notify_3(XtDisplay((Widget)(w)), XtWindow((Widget)(w)),\
		     type, l0, l1, l2)

static void externalClientInitialize (Widget req, Widget new_, ArgList args,
				      Cardinal *num_args);
static void externalClientRealize (Widget widget, XtValueMask *mask,
		    XSetWindowAttributes *attrs);
static void Destroy (Widget w);
static void EventHandler (Widget wid, XtPointer closure, XEvent *event,
			  Boolean *continue_to_dispatch);
static void MaskableEventHandler (Widget wid, XtPointer closure, XEvent *event,
				  Boolean *continue_to_dispatch);
static XtGeometryResult QueryGeometry(Widget, XtWidgetGeometry *,
				      XtWidgetGeometry *);
static void ExternalClientFocusIn (Widget, XEvent *, String *, Cardinal *);
static void ExternalClientFocusOut (Widget, XEvent *, String *, Cardinal *);
static void ExternalClientEnter (Widget, XEvent *, String *, Cardinal *);
static void ExternalClientLeave (Widget, XEvent *, String *, Cardinal *);

static int my_error_handler(Display *display, XErrorEvent *xev);
static int (*error_old_handler)(Display *, XErrorEvent *);

static XtResource resources[] = {
#define offset(field) XtOffset(ExternalClientWidget, externalClient.field)
  { XtNshellTimeout, XtCShellTimeout,
    XtRInt, sizeof (int),
    offset(shell_timeout), XtRImmediate,(XtPointer)DEFAULT_WM_TIMEOUT },
  { XtNdeadShell, XtCDeadShell,
    XtRBoolean, sizeof (Boolean),
    offset(dead_shell), XtRImmediate, (XtPointer)False },
#ifdef EXTW_USES_MOTIF
  { XmNnavigationType, XmCNavigationType,
    XmRNavigationType, sizeof (XmNavigationType),
    XtOffset (ExternalClientWidget, primitive.navigation_type),
    XtRImmediate, (XtPointer)XmTAB_GROUP },
#endif
  { XtNemacsProcID, XtCEmacsProcID,
    XtRString, sizeof (String),
    offset(emacs_procid), XtRImmediate, (XtPointer)NULL },
  { XtNshellReadyCallback, XtCCallback,
    XtRCallback, sizeof (XtCallbackList),
    offset(shell_ready_callback), XtRImmediate, (XtPointer)NULL },
  { XtNshellName, XtCShellName,
    XtRString, sizeof (String),
    offset(shell_name), XtRImmediate, (XtPointer)NULL },
  { XtNuseToolTalk, XtCUseToolTalk,
    XtRBoolean, sizeof (Boolean),
    offset(use_tooltalk), XtRImmediate, (XtPointer)False }
};

static XtActionsRec actions[] = {
  {"focusIn",	ExternalClientFocusIn},
  {"focusOut",	ExternalClientFocusOut},
  {"enter",	ExternalClientEnter},
  {"leave",	ExternalClientLeave},
};

ExternalClientClassRec externalClientClassRec = {
    { /*
       *	core_class fields
       */
#ifdef EXTW_USES_MOTIF
    /* superclass	  */	(WidgetClass) &xmPrimitiveClassRec,
#else
    /* superclass	  */	(WidgetClass) &coreClassRec,
#endif
    /* class_name	  */	"ExternalClient",
    /* size		  */	sizeof (ExternalClientRec),
    /* Class Initializer  */	NULL,
    /* class_part_initialize*/	NULL, /* XtInheritClassPartInitialize, */
    /* Class init'ed ?	  */	FALSE,
    /* initialize	  */	externalClientInitialize,
    /* initialize_notify  */	NULL,
    /* realize		  */	externalClientRealize,
    /* actions		  */	actions,
    /* num_actions	  */	XtNumber (actions),
    /* resources	  */	resources,
    /* resource_count	  */	XtNumber (resources),
    /* xrm_class	  */	NULLQUARK,
    /* compress_motion	  */	FALSE,
    /* compress_exposure  */	TRUE,
    /* compress_enterleave*/	FALSE,
    /* visible_interest	  */	TRUE,
    /* destroy		  */	Destroy, /* XtInheritDestroy, */
    /* resize		  */	XtInheritResize,
    /* expose		  */	NULL,
    /* set_values	  */	NULL, /* XtInheritSetValues, */
    /* set_values_hook	  */	NULL,
    /* set_values_almost  */	XtInheritSetValuesAlmost,
    /* get_values_hook	  */	NULL,
    /* accept_focus	  */	NULL,
    /* intrinsics version */	XtVersion,
    /* callback offsets	  */	NULL,
    /* tm_table		  */	"", /* MUST NOT BE NULL or
                                       XtInheritTranslations in Motif!!!!!
				       Otherwise keyboard focus translations
				       will not work. */
    /* query_geometry	  */	QueryGeometry,
    /* display_accelerator*/	NULL,
    /* extension	  */	NULL
  },
#ifdef EXTW_USES_MOTIF
  {
    XmInheritBorderHighlight,/* Primitive border_highlight */
    XmInheritBorderHighlight,/* Primitive border_unhighlight */
    XtInheritTranslations,   /* translations */
    NULL,                    /* arm_and_activate */
    NULL,                    /* get resources */
    0,                       /* num get_resources */
    NULL,                    /* extension */
  },
#endif
  {
    0
  }
};

WidgetClass externalClientWidgetClass = (WidgetClass) &externalClientClassRec;

static void
externalClientInitialize (Widget UNUSED (req), Widget new_,
			  ArgList UNUSED (args), Cardinal *UNUSED (num_args))
{
  ExternalClientWidget ecw = (ExternalClientWidget) new_;
  static int error_handler_added = 0;

  extw_initialize_atoms (XtDisplay (new_));
  extw_which_side = extw_client_send;

#ifdef EXTW_USES_MOTIF

  /* yes I know this is horrible.  However, the XmPrimitive class adds
     the Tab translation in its initialization routine, so we have to
     override it here.  This is all the fault of Xt, which doesn't
     provide a proper inheritance mechanism for translations.

     -- BPW

  */

  XtOverrideTranslations (new_,
			  XtParseTranslationTable ("None<Key>Tab:\n"
						   "<FocusIn>:focusIn()\n"
						   "<FocusOut>:focusOut()\n"
						   "<Enter>:enter()\n"
						   "<Leave>:leave()\n"));

#endif

  XtAddEventHandler (new_, 0, TRUE, EventHandler, (XtPointer) NULL);

  ecw->externalClient.shell_ready = False;
  ecw->externalClient.has_focus = False;

  if (!error_handler_added)
    {
      error_handler_added = 1;
      error_old_handler = XSetErrorHandler (my_error_handler);
    }
}


#ifdef TOOLTALK
static Tt_callback_action
tt_callback(Tt_message m, Tt_pattern UNUSED (p))
{
  ExternalClientWidget ecw = (ExternalClientWidget)tt_message_user (m, 0);

  switch (tt_message_state(m))
    {
    case TT_FAILED:
      /* handle errors here */
      break;
    case TT_HANDLED:
      ecw->externalClient.shell_name = tt_message_arg_val (m, 2);
      XtCallCallbackList ((Widget) ecw,
			  ecw->externalClient.shell_ready_callback, NULL);
      break;
    }

  tt_message_destroy (m);
  return TT_CALLBACK_PROCESSED;
}

static void
send_tooltalk_handshake (ExternalClientWidget ecw, Window win, char *name)
{
  Tt_message m = tt_message_create ();

  tt_message_op_set (m, "emacs-make-client-screen");
  tt_message_scope_set (m, TT_SESSION);
  tt_message_class_set (m, TT_REQUEST);
  tt_message_arg_add (m, TT_IN, "string", name);
  tt_message_iarg_add (m, TT_IN, "int", win);
  tt_message_arg_add (m, TT_OUT, "string", NULL);
  tt_message_user_set (m, 0, (void *)ecw);
  tt_message_callback_add (m, tt_callback);
  if (ecw->externalClient.emacs_procid)
    {
      tt_message_address_set (m, TT_HANDLER);
      tt_message_handler_set (m, ecw->externalClient.emacs_procid);
  }
  else
    tt_message_address_set (m, TT_PROCEDURE);
  tt_message_send (m);
}

#endif


static void
externalClientRealize (Widget w, XtValueMask *vm, XSetWindowAttributes *attrs)
{
#ifdef TOOLTALK
  ExternalClientWidget ecw = (ExternalClientWidget)w;
#endif

#ifdef EXTW_USES_MOTIF
  (*xmPrimitiveWidgetClass->core_class.realize) (w, vm, attrs);
#else
  (*coreWidgetClass->core_class.realize) (w, vm, attrs);
#endif

#ifdef TOOLTALK
  /* Make sure that the server actually knows about this window id before
   * telling Emacs about it.
   */
  if (ecw->externalClient.use_tooltalk)
    {
      XSync (XtDisplay (w), False);
      send_tooltalk_handshake (ecw, XtWindow (w), XtName (w));
    }
#endif
}


/***********************************************************************/

/* window-to-widget list. */

struct ww_list
{
  Window win;
  Widget wid;
  struct ww_list *next;
};

struct ww_list ww_list[1];

static int
add_ww (Window win, Widget wid)
{
  struct ww_list *ww = (struct ww_list *) malloc (sizeof (struct
							  ww_list));
  if (!ww)
    return 0;
  ww->win = win;
  ww->wid = wid;
  ww->next = ww_list->next;
  ww_list->next = ww;
  return 1;
}

static Widget
remove_ww (Window win)
{
  struct ww_list *w1, *w2;
  Widget wid = 0;

  for (w1=ww_list, w2=w1->next; w2; w1=w2, w2=w2->next)
    if (w2->win == win)
      {
	w1->next = w2->next;
	wid = w2->wid;
	free (w2);
	break;
      }
  return wid;
}

/***********************************************************************/

/* stolen outright from Intrinsic.c */

static void
ComputeWindowAttributes (Widget widget, XtValueMask *value_mask,
			 XSetWindowAttributes *values)
{
  *value_mask = CWEventMask | CWColormap;
  (*values).event_mask = XtBuildEventMask(widget);
  (*values).colormap = widget->core.colormap;
  if (widget->core.background_pixmap != XtUnspecifiedPixmap) {
    *value_mask |= CWBackPixmap;
    (*values).background_pixmap = widget->core.background_pixmap;
  } else {
    *value_mask |= CWBackPixel;
    (*values).background_pixel = widget->core.background_pixel;
  }
  if (widget->core.border_pixmap != XtUnspecifiedPixmap) {
    *value_mask |= CWBorderPixmap;
    (*values).border_pixmap = widget->core.border_pixmap;
  } else {
    *value_mask |= CWBorderPixel;
    (*values).border_pixel = widget->core.border_pixel;
  }
  if (widget->core.widget_class->core_class.expose == (XtExposeProc) NULL) {
    /* Try to avoid redisplay upon resize by making bit_gravity the same
       as the default win_gravity */
    *value_mask |= CWBitGravity;
    (*values).bit_gravity = NorthWestGravity;
  }
} /* ComputeWindowAttributes */

static void
end_connection (ExternalClientWidget w)
{
  XSetWindowAttributes xswa;
  XtValueMask mask;
  Widget wid = (Widget) w;

  w->externalClient.shell_ready = False;
  XtRemoveEventHandler (wid, w->externalClient.event_mask,
			FALSE, MaskableEventHandler, (XtPointer) NULL);
  ComputeWindowAttributes (wid, &mask, &xswa);
  XChangeWindowAttributes (XtDisplay (wid), XtWindow (wid), mask, &xswa);
  XClearArea (XtDisplay (wid), XtWindow (wid), 0, 0, 0, 0, True);
}

static int
my_error_handler (Display *display, XErrorEvent *xev)
{
  Widget wid;

  if (xev->error_code != BadWindow)
    goto call_old;
  wid = remove_ww (xev->resourceid);
  if (wid)
    {
      end_connection ((ExternalClientWidget) wid);
      return 0;
    }

 call_old:
  return error_old_handler (display, xev);
}

static void
MaskableEventHandler (Widget wid, XtPointer UNUSED (closure), XEvent *event,
		      Boolean *UNUSED (continue_to_dispatch))
{
  ExternalClientWidget w = (ExternalClientWidget) wid;

  if (w->externalClient.shell_ready)
    {
      if (event->type == KeyPress || event->type == KeyRelease ||
	  event->type == ButtonPress || event->type == ButtonRelease ||
	  event->type == MotionNotify)
	event->xkey.subwindow = 0;
#ifdef EXTW_USES_MOTIF
      /* hackkkkkkkkkkkkkk!  Suppress CTRL-TAB, SHIFT-TAB, etc. so that
	 Emacs doesn't attempt to interpret focus-change keystrokes. */
      if (event->type == KeyPress &&
	  XLookupKeysym ((XKeyEvent *) event, 0) == XK_Tab &&
	  (event->xkey.state & ControlMask ||
	   event->xkey.state & ShiftMask))
	return;
#endif
      event->xany.window = w->core.window;
      XSendEvent (XtDisplay (wid), w->externalClient.event_window, FALSE, 0,
		  event);
      XSync (XtDisplay (wid), 0); /* make sure that any BadWindow errors
				     (meaning the server died) get handled
				     before XSendEvent is called again. */

    }
}

static void
EventHandler (Widget wid, XtPointer UNUSED (closure), XEvent *event,
	      Boolean *UNUSED (continue_to_dispatch))
{
  ExternalClientWidget w = (ExternalClientWidget) wid;

  if (w->core.window != event->xany.window)
    {
      XtAppErrorMsg (XtWidgetToApplicationContext (wid),
		     "invalidWindow","eventHandler",XtCXtToolkitError,
		     "Event with wrong window",
		     (String *)NULL, (Cardinal *)NULL);
      return;
    }

  if (event->type == ClientMessage &&
      event->xclient.message_type == a_EXTW_NOTIFY &&
      event->xclient.data.l[0] == extw_shell_send)
    switch (event->xclient.data.l[1])
      {

      case extw_notify_qg:
	/* shell is alive again. */

	w->externalClient.dead_shell = False;
	break;

      case extw_notify_gm:
	{
	  XtWidgetGeometry xwg, xwg_return;
	  XtGeometryResult result;

	  extw_get_geometry_value (XtDisplay (wid), XtWindow (wid),
				   a_EXTW_GEOMETRY_MANAGER, &xwg);
	  result = XtMakeGeometryRequest (wid, &xwg, &xwg_return);

	  extw_send_geometry_value (XtDisplay (wid), XtWindow (wid),
				    a_EXTW_GEOMETRY_MANAGER, extw_notify_gm,
				    result == XtGeometryAlmost ? &xwg_return :
				    NULL, result);
	  break;
	}

      case extw_notify_init:
	w->externalClient.shell_ready = True;
	w->externalClient.event_window = event->xclient.data.l[2];
	w->externalClient.event_mask = event->xclient.data.l[3];
	add_ww (w->externalClient.event_window, (Widget) w);

	XtAddEventHandler (wid, w->externalClient.event_mask,
			   FALSE, MaskableEventHandler, (XtPointer) NULL);
#ifdef EXTW_USES_MOTIF
	NOTIFY (w, extw_notify_init,
		EXTW_TYPE_MOTIF,
		0, 0);
#else
	NOTIFY (w, extw_notify_init,
		EXTW_TYPE_XT,
		0, 0);
#endif
	break;

      case extw_notify_end:
	end_connection (w);
	remove_ww (w->externalClient.event_window);
	break;

      case extw_notify_set_focus:
#ifdef EXTW_USES_MOTIF
	XmProcessTraversal (wid, XmTRAVERSE_CURRENT);
#else
	XtSetKeyboardFocus (wid, None);
#endif
	break;

      }
}

static void Destroy (Widget wid)
{
  ExternalClientWidget w = (ExternalClientWidget)wid;

  NOTIFY(w, extw_notify_end, 0, 0, 0);
}

static XtGeometryResult
QueryGeometry (Widget gw, XtWidgetGeometry *request, XtWidgetGeometry *reply)
{
  ExternalClientWidget w = (ExternalClientWidget) gw;
  XEvent event;
  unsigned long request_num;
  Display *display = XtDisplay(gw);
  XtWidgetGeometry req = *request; /* don't modify caller's structure */

  if (!XtIsRealized((Widget)w) || !w->externalClient.shell_ready)
    return XtGeometryYes;

  if (w->externalClient.dead_shell == TRUE)
    /* The shell is sick. */
    return XtGeometryNo;

  req.sibling = None;
  req.request_mode &= ~CWSibling;
  request_num = NextRequest(display);
  extw_send_geometry_value(XtDisplay(gw), XtWindow(gw), a_EXTW_QUERY_GEOMETRY,
			   extw_notify_qg, &req, 0);

  if (extw_wait_for_response(gw, &event, request_num, extw_notify_qg,
			     w->externalClient.shell_timeout)) {
    XtGeometryResult result = (XtGeometryResult) event.xclient.data.l[0];

    if (result == XtGeometryAlmost) {
      extw_get_geometry_value(XtDisplay(gw), XtWindow(gw),
			      a_EXTW_QUERY_GEOMETRY, reply);
    }
    return result;
  } else {
    w->externalClient.dead_shell = TRUE; /* timed out; must be broken */
    return XtGeometryNo;
  }
}

#ifdef EXTW_USES_MOTIF
# define USED_IF_MOTIF(decl) decl
#else
# define USED_IF_MOTIF(decl) UNUSED (decl)
#endif

static void ExternalClientFocusIn (Widget w, XEvent *event,
				   String *USED_IF_MOTIF (params),
				   Cardinal *USED_IF_MOTIF (num_params))
{
  ExternalClientWidget ecw = (ExternalClientWidget) w;

  if (event->xfocus.send_event && !ecw->externalClient.has_focus) {
    ecw->externalClient.has_focus = True;
    NOTIFY(ecw, extw_notify_focus_in, 0, 0, 0);
  }
#ifdef EXTW_USES_MOTIF
  _XmPrimitiveFocusIn (w, event, params, num_params);
#endif
}

static void ExternalClientFocusOut (Widget w, XEvent *event,
				    String *USED_IF_MOTIF (params),
				    Cardinal *USED_IF_MOTIF (num_params))
{
  ExternalClientWidget ecw = (ExternalClientWidget) w;

  if (event->xfocus.send_event && ecw->externalClient.has_focus) {
    ecw->externalClient.has_focus = False;
    NOTIFY(ecw, extw_notify_focus_out, 0, 0, 0);
  }
#ifdef EXTW_USES_MOTIF
  _XmPrimitiveFocusOut(w, event, params, num_params);
#endif
}

static void ExternalClientEnter (Widget w, XEvent *event,
				 String *USED_IF_MOTIF (params),
				 Cardinal *USED_IF_MOTIF (num_params))
{
  ExternalClientWidget ecw = (ExternalClientWidget) w;

  if (
#ifdef EXTW_USES_MOTIF
      _XmGetFocusPolicy (w) != XmEXPLICIT &&
#endif
      !ecw->externalClient.has_focus &&
      event->xcrossing.focus && event->xcrossing.detail != NotifyInferior) {
    ecw->externalClient.has_focus = True;
    NOTIFY(ecw, extw_notify_focus_in, 0, 0, 0);
  }
#ifdef EXTW_USES_MOTIF
  _XmPrimitiveEnter (w, event, params, num_params);
#endif
}

static void ExternalClientLeave (Widget w, XEvent *event,
				 String *USED_IF_MOTIF (params),
				 Cardinal *USED_IF_MOTIF (num_params))
{
  ExternalClientWidget ecw = (ExternalClientWidget) w;

  if (
#ifdef EXTW_USES_MOTIF
      _XmGetFocusPolicy (w) != XmEXPLICIT &&
#endif
      ecw->externalClient.has_focus &&
      event->xcrossing.focus && event->xcrossing.detail != NotifyInferior) {
    ecw->externalClient.has_focus = False;
    NOTIFY(ecw, extw_notify_focus_out, 0, 0, 0);
  }
#ifdef EXTW_USES_MOTIF
  _XmPrimitiveLeave (w, event, params, num_params);
#endif
}