/* Evolution calendar listener
 *
 * Copyright (C) 2000 Helix Code, Inc.
 *
 * Author: Federico Mena-Quintero <federico@helixcode.com>
 *
 * 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 <config.h>
#include <gtk/gtksignal.h>
#include "cal-listener.h"



/* Private part of the CalListener structure */
typedef struct {
	/* The calendar this listener refers to */
	Evolution_Calendar_Cal cal;
} CalListenerPrivate;



/* Signal IDs */
enum {
	CAL_LOADED,
	OBJ_UPDATED,
	OBJ_REMOVED,
	LAST_SIGNAL
};

static void cal_listener_class_init (CalListenerClass *class);
static void cal_listener_init (CalListener *listener);
static void cal_listener_destroy (GtkObject *object);

static void marshal_cal_loaded (GtkObject *object, GtkSignalFunc func, gpointer data, GtkArg *args);

static POA_Evolution_Calendar_Listener__vepv cal_listener_vepv;

static guint cal_listener_signals[LAST_SIGNAL];

static BonoboObjectClass *parent_class;



/**
 * cal_listener_get_type:
 * @void:
 *
 * Registers the #CalListener class if necessary, and returns the type ID
 * associated to it.
 *
 * Return value: The type ID of the #CalListener class.
 **/
GtkType
cal_listener_get_type (void)
{
	static GtkType cal_listener_type = 0;

	if (!cal_listener_type) {
		static const GtkTypeInfo cal_listener_info = {
			"CalListener",
			sizeof (CalListener),
			sizeof (CalListenerClass),
			(GtkClassInitFunc) cal_listener_class_init,
			(GtkObjectInitFunc) cal_listener_init,
			NULL, /* reserved_1 */
			NULL, /* reserved_2 */
			(GtkClassInitFunc) NULL
		};

		cal_listener_type = gtk_type_unique (bonobo_object_get_type (), &cal_listener_info);
	}

	return cal_listener_type;
}

/* CORBA class initialization function for the calendar listener */
static void
init_cal_listener_corba_class (void)
{
	cal_listener_vepv.Bonobo_Unknown_epv = bonobo_object_get_epv ();
	cal_listener_vepv.Evolution_Calendar_Listener_epv = cal_listener_get_epv ();
}

/* Class initialization function for the calendar listener */
static void
cal_listener_class_init (CalListenerClass *class)
{
	GtkObjectClass *object_class;

	object_class = (GtkObjectClass *) class;

	parent_class = gtk_type_class (bonobo_object_get_type ());

	cal_listener_signals[CAL_LOADED] =
		gtk_signal_new ("cal_loaded",
				GTK_RUN_FIRST,
				object_class->type,
				GTK_SIGNAL_OFFSET (CalListenerClass, cal_loaded),
				marshal_cal_loaded,
				GTK_TYPE_NONE, 2,
				GTK_TYPE_ENUM,
				GTK_TYPE_POINTER);
	cal_listener_signals[OBJ_UPDATED] =
		gtk_signal_new ("obj_updated",
				GTK_RUN_FIRST,
				object_class->type,
				GTK_SIGNAL_OFFSET (CalListenerClass, obj_updated),
				gtk_marshal_NONE__POINTER,
				GTK_TYPE_NONE, 1,
				GTK_TYPE_POINTER);
	cal_listener_signals[OBJ_REMOVED] =
		gtk_signal_new ("obj_removed",
				GTK_RUN_FIRST,
				object_class->type,
				GTK_SIGNAL_OFFSET (CalListenerClass, obj_removed),
				gtk_marshal_NONE__POINTER,
				GTK_TYPE_NONE, 1,
				GTK_TYPE_POINTER);

	gtk_object_class_add_signals (object_class, cal_listener_signals, LAST_SIGNAL);

	object_class->destroy = cal_listener_destroy;

	init_cal_listener_corba_class ();
}

/* Object initialization function for the calendar listener */
static void
cal_listener_init (CalListener *listener)
{
	CalListenerPrivate *priv;

	priv = g_new0 (CalListenerPrivate, 1);
	listener->priv = priv;

	priv->cal = CORBA_OBJECT_NIL;
}

/* Destroy handler for the calendar listener */
static void
cal_listener_destroy (GtkObject *object)
{
	CalListener *listener;
	CalListenerPrivate *priv;
	CORBA_Environment ev;
	gboolean result;

	g_return_if_fail (object != NULL);
	g_return_if_fail (IS_CAL_LISTENER (object));

	listener = CAL_LISTENER (object);
	priv = listener->priv;

	CORBA_exception_init (&ev);
	result = CORBA_Object_is_nil (priv->cal, &ev);

	if (ev._major != CORBA_NO_EXCEPTION)
		g_message ("cal_listener_destroy(): could not see if the calendar was NIL");
	else if (!result) {
		CORBA_exception_free (&ev);

		CORBA_exception_init (&ev);
		CORBA_Object_release (priv->cal, &ev);

		if (ev._major != CORBA_NO_EXCEPTION)
			g_message ("cal_listener_destroy(): could not release the calendar");

		priv->cal = CORBA_OBJECT_NIL;
	}
	CORBA_exception_free (&ev);

	g_free (priv);

	if (GTK_OBJECT_CLASS (parent_class)->destroy)
		(* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}



/* Marshalers */

typedef void (* CalLoadedFunc) (GtkObject *object, gint status, gpointer cal, gpointer data);

static void
marshal_cal_loaded (GtkObject *object, GtkSignalFunc func, gpointer data, GtkArg *args)
{
	CalLoadedFunc rfunc;

	rfunc = (CalLoadedFunc) func;
	(* rfunc) (object, GTK_VALUE_ENUM (args[0]), GTK_VALUE_POINTER (args[1]), data);
}



/* CORBA servant implementation */

/* Listener::cal_loaded method */
static void
Listener_cal_loaded (PortableServer_Servant servant,
		     Evolution_Calendar_Listener_LoadStatus status,
		     Evolution_Calendar_Cal cal,
		     CORBA_Environment *ev)
{
	CalListener *listener;
	CalListenerPrivate *priv;
	CORBA_Environment aev;
	Evolution_Calendar_Cal cal_copy;
	CalListenerLoadStatus load_status;

	listener = CAL_LISTENER (bonobo_object_from_servant (servant));
	priv = listener->priv;

	if (priv->cal != CORBA_OBJECT_NIL) {
		g_message ("Listener_cal_loaded(): calendar was already loaded!");
		return;
	}

	CORBA_exception_init (&aev);
	cal_copy = CORBA_Object_duplicate (cal, &aev);

	if (aev._major != CORBA_NO_EXCEPTION) {
		g_message ("Listener_cal_loaded(): could not duplicate the calendar");
		CORBA_exception_free (&aev);
		return;
	}
	CORBA_exception_free (&aev);

	priv->cal = cal_copy;

	switch (status) {
	case Evolution_Calendar_Listener_SUCCESS:
		load_status = CAL_LISTENER_LOAD_SUCCESS;
		break;

	case Evolution_Calendar_Listener_ERROR:
		load_status = CAL_LISTENER_LOAD_ERROR;
		break;

	case Evolution_Calendar_Listener_IN_USE:
		load_status = CAL_LISTENER_LOAD_IN_USE;
		break;

	default:
		load_status = CAL_LISTENER_LOAD_ERROR; /* keep gcc happy */
		g_assert_not_reached ();
	}

	gtk_signal_emit (GTK_OBJECT (listener), cal_listener_signals[CAL_LOADED],
			 load_status, cal);
}

/* Listener::obj_updated method */
static void
Listener_obj_updated (PortableServer_Servant servant,
		      Evolution_Calendar_CalObjUID uid,
		      CORBA_Environment *ev)
{
	CalListener *listener;

	listener = CAL_LISTENER (bonobo_object_from_servant (servant));
	gtk_signal_emit (GTK_OBJECT (listener), cal_listener_signals[OBJ_UPDATED],
			 uid);
}

/* Listener::obj_removed method */
static void
Listener_obj_removed (PortableServer_Servant servant,
		      Evolution_Calendar_CalObjUID uid,
		      CORBA_Environment *ev)
{
	CalListener *listener;

	listener = CAL_LISTENER (bonobo_object_from_servant (servant));
	gtk_signal_emit (GTK_OBJECT (listener), cal_listener_signals[OBJ_REMOVED],
			 uid);
}

/**
 * cal_listener_get_epv:
 * @void:
 *
 * Creates an EPV for the Listener CORBA class.
 *
 * Return value: A newly-allocated EPV.
 **/
POA_Evolution_Calendar_Listener__epv *
cal_listener_get_epv (void)
{
	POA_Evolution_Calendar_Listener__epv *epv;

	epv = g_new0 (POA_Evolution_Calendar_Listener__epv, 1);
	epv->cal_loaded = Listener_cal_loaded;
	epv->obj_updated = Listener_obj_updated;
	epv->obj_removed = Listener_obj_removed;
	return epv;
}



/**
 * cal_listener_construct:
 * @listener: A calendar listener.
 * @corba_listener: CORBA object for the calendar listener.
 *
 * Constructs a calendar listener by binding the corresponding CORBA object to
 * it.
 *
 * Return value: the same object as the @listener argument.
 **/
CalListener *
cal_listener_construct (CalListener *listener, Evolution_Calendar_Listener corba_listener)
{
	g_return_val_if_fail (listener != NULL, NULL);
	g_return_val_if_fail (IS_CAL_LISTENER (listener), NULL);

	bonobo_object_construct (BONOBO_OBJECT (listener), corba_listener);
	return listener;
}

/**
 * cal_listener_corba_object_create:
 * @object: #BonoboObject that will wrap the CORBA object.
 *
 * Creates and activates the CORBA object that is wrapped by the specified
 * calendar listener @object.
 *
 * Return value: An activated object reference or #CORBA_OBJECT_NIL in case of
 * failure.
 **/
Evolution_Calendar_Listener
cal_listener_corba_object_create (BonoboObject *object)
{
	POA_Evolution_Calendar_Listener *servant;
	CORBA_Environment ev;

	g_return_val_if_fail (object != NULL, CORBA_OBJECT_NIL);
	g_return_val_if_fail (IS_CAL_LISTENER (object), CORBA_OBJECT_NIL);

	servant = (POA_Evolution_Calendar_Listener *) g_new0 (BonoboObjectServant, 1);
	servant->vepv = &cal_listener_vepv;

	CORBA_exception_init (&ev);
	POA_Evolution_Calendar_Listener__init ((PortableServer_Servant) servant, &ev);
	if (ev._major != CORBA_NO_EXCEPTION) {
		g_free (servant);
		CORBA_exception_free (&ev);
		return CORBA_OBJECT_NIL;
	}

	CORBA_exception_free (&ev);
	return (Evolution_Calendar_Listener) bonobo_object_activate_servant (object, servant);
}

/**
 * cal_listener_new:
 * @void:
 *
 * Creates a new #CalListener object.
 *
 * Return value: A newly-created #CalListener, or NULL if its corresponding
 * CORBA object could not be created.
 **/
CalListener *
cal_listener_new (void)
{
	CalListener *listener;
	CORBA_Environment ev;
	Evolution_Calendar_Listener corba_listener;
	gboolean result;

	listener = gtk_type_new (CAL_LISTENER_TYPE);

	corba_listener = cal_listener_corba_object_create (BONOBO_OBJECT (listener));

	CORBA_exception_init (&ev);
	result = CORBA_Object_is_nil (corba_listener, &ev);
	
	if (ev._major != CORBA_NO_EXCEPTION || result) {
		g_message ("cal_listener_new(): could not create the CORBA listener");
		bonobo_object_unref (BONOBO_OBJECT (listener));
		CORBA_exception_free (&ev);
		return NULL;
	}
	CORBA_exception_free (&ev);

	return cal_listener_construct (listener, corba_listener);
}

/**
 * cal_listener_get_calendar:
 * @listener: A calendar listener.
 * 
 * Queries the calendar that a listener is watching.
 * 
 * Return value: The calendar that the listener is watching.
 **/
Evolution_Calendar_Cal
cal_listener_get_calendar (CalListener *listener)
{
	CalListenerPrivate *priv;

	g_return_val_if_fail (listener != NULL, CORBA_OBJECT_NIL);
	g_return_val_if_fail (IS_CAL_LISTENER (listener), CORBA_OBJECT_NIL);

	priv = listener->priv;
	return priv->cal;
}