/*
 * This program 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.
 *
 * 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 Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 *
 * Authors:
 *		JP Rosevear <jpr@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <time.h>
#include <glib/gi18n.h>
#include <libical/ical.h>
#include <libsoup/soup.h>

#include <composer/e-msg-composer.h>

#include "itip-utils.h"
#include "dialogs/comp-editor-util.h"
#include "calendar-config.h"

#define d(x)

static const gchar *itip_methods[] = {
	"PUBLISH",
	"REQUEST",
	"REPLY",
	"ADD",
	"CANCEL",
	"RERESH",
	"COUNTER",
	"DECLINECOUNTER"
};

static icalproperty_method itip_methods_enum[] = {
    ICAL_METHOD_PUBLISH,
    ICAL_METHOD_REQUEST,
    ICAL_METHOD_REPLY,
    ICAL_METHOD_ADD,
    ICAL_METHOD_CANCEL,
    ICAL_METHOD_REFRESH,
    ICAL_METHOD_COUNTER,
    ICAL_METHOD_DECLINECOUNTER,
};

/**
 * itip_get_default_name_and_address:
 * @registry: an #ESourceRegistry
 * @name: return location for the user's real name, or %NULL
 * @address: return location for the user's email address, or %NULL
 *
 * Returns the real name and email address of the default mail identity,
 * if available.  If no default mail identity is available, @name and
 * @address are set to %NULL and the function returns %FALSE.
 *
 * Returns: %TRUE if @name and/or @address were set
 **/
gboolean
itip_get_default_name_and_address (ESourceRegistry *registry,
                                   gchar **name,
                                   gchar **address)
{
	ESource *source;
	ESourceExtension *extension;
	const gchar *extension_name;
	gboolean success;

	source = e_source_registry_ref_default_mail_identity (registry);

	if (source != NULL) {
		extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;
		extension = e_source_get_extension (source, extension_name);

		if (name != NULL)
			*name = e_source_mail_identity_dup_name (
				E_SOURCE_MAIL_IDENTITY (extension));

		if (address != NULL)
			*address = e_source_mail_identity_dup_address (
				E_SOURCE_MAIL_IDENTITY (extension));

		g_object_unref (source);

		success = TRUE;

	} else {
		if (name != NULL)
			*name = NULL;

		if (address != NULL)
			*address = NULL;

		success = FALSE;
	}

	return success;
}

/**
 * itip_get_user_identities:
 * @registry: an #ESourceRegistry
 *
 * Returns a %NULL-terminated array of name + address strings based on
 * registered mail identities.  Free the returned array with g_strfreev().
 *
 * Returns: an %NULL-terminated array of mail identity strings
 **/
gchar **
itip_get_user_identities (ESourceRegistry *registry)
{
	GList *list, *iter;
	const gchar *extension_name;
	gchar **identities;
	guint ii = 0;

	g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), NULL);

	extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;

	list = e_source_registry_list_sources (registry, extension_name);

	identities = g_new0 (gchar *, g_list_length (list) + 1);

	for (iter = list; iter != NULL; iter = g_list_next (iter)) {
		ESource *source = E_SOURCE (iter->data);
		ESourceMailIdentity *extension;
		const gchar *name, *address;

		extension = e_source_get_extension (source, extension_name);

		name = e_source_mail_identity_get_name (extension);
		address = e_source_mail_identity_get_address (extension);

		if (name == NULL || address == NULL)
			continue;

		identities[ii++] = g_strdup_printf ("%s <%s>", name, address);
	}

	g_list_free_full (list, (GDestroyNotify) g_object_unref);

	return identities;
}

/**
 * itip_get_fallback_identity:
 * @registry: an #ESourceRegistry
 *
 * Returns a name + address string taken from the default mail identity,
 * but only if the corresponding account is enabled.  If the account is
 * disabled, the function returns %NULL.  This is meant to be used as a
 * fallback identity for organizers.  Free the returned string with
 * g_free().
 *
 * Returns: a fallback mail identity, or %NULL
 **/
gchar *
itip_get_fallback_identity (ESourceRegistry *registry)
{
	ESource *source;
	ESourceMailIdentity *mail_identity;
	const gchar *extension_name;
	const gchar *address;
	const gchar *name;
	gchar *identity = NULL;

	g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), NULL);

	source = e_source_registry_ref_default_mail_identity (registry);

	if (source == NULL)
		return NULL;

	if (!e_source_registry_check_enabled (registry, source)) {
		g_object_unref (source);
		return NULL;
	}

	extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;
	mail_identity = e_source_get_extension (source, extension_name);

	name = e_source_mail_identity_get_name (mail_identity);
	address = e_source_mail_identity_get_address (mail_identity);

	if (name != NULL && address != NULL)
		identity = g_strdup_printf ("%s <%s>", name, address);

	g_object_unref (source);

	return identity;
}

/**
 * itip_address_is_user:
 * @registry: an #ESourceRegistry
 * @address: an email address
 *
 * Looks for a registered mail identity with a matching email address.
 *
 * Returns: %TRUE if a match was found, %FALSE if not
 **/
gboolean
itip_address_is_user (ESourceRegistry *registry,
                      const gchar *address)
{
	GList *list, *iter;
	const gchar *extension_name;
	gboolean match = FALSE;

	g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), FALSE);
	g_return_val_if_fail (address != NULL, FALSE);

	extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;

	list = e_source_registry_list_sources (registry, extension_name);

	for (iter = list; iter != NULL; iter = g_list_next (iter)) {
		ESource *source = E_SOURCE (iter->data);
		ESourceMailIdentity *extension;
		const gchar *id_address;

		extension = e_source_get_extension (source, extension_name);
		id_address = e_source_mail_identity_get_address (extension);

		if (id_address == NULL)
			continue;

		if (g_ascii_strcasecmp (address, id_address) == 0) {
			match = TRUE;
			break;
		}
	}

	g_list_free_full (list, (GDestroyNotify) g_object_unref);

	return match;
}

gboolean
itip_organizer_is_user (ESourceRegistry *registry,
                        ECalComponent *comp,
                        ECalClient *cal_client)
{
	return itip_organizer_is_user_ex (registry, comp, cal_client, FALSE);
}

gboolean
itip_organizer_is_user_ex (ESourceRegistry *registry,
                           ECalComponent *comp,
                           ECalClient *cal_client,
                           gboolean skip_cap_test)
{
	ECalComponentOrganizer organizer;
	const gchar *strip;
	gboolean user_org = FALSE;

	g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), FALSE);

	if (!e_cal_component_has_organizer (comp) ||
		(!skip_cap_test && e_client_check_capability (
		E_CLIENT (cal_client), CAL_STATIC_CAPABILITY_NO_ORGANIZER)))
		return FALSE;

	e_cal_component_get_organizer (comp, &organizer);
	if (organizer.value != NULL) {
		gchar *email = NULL;

		strip = itip_strip_mailto (organizer.value);

		if (e_client_get_backend_property_sync (E_CLIENT (cal_client),
							CAL_BACKEND_PROPERTY_CAL_EMAIL_ADDRESS,
							&email, NULL, NULL) &&
				email && g_ascii_strcasecmp (email, strip) == 0) {
			g_free (email);

			return TRUE;
		}

		g_free (email);

		if (e_client_check_capability (E_CLIENT (cal_client), CAL_STATIC_CAPABILITY_ORGANIZER_NOT_EMAIL_ADDRESS)) {
			return FALSE;
		}

		user_org = itip_address_is_user (registry, strip);
	}

	return user_org;
}

gboolean
itip_sentby_is_user (ESourceRegistry *registry,
                     ECalComponent *comp,
                     ECalClient *cal_client)
{
	ECalComponentOrganizer organizer;
	const gchar *strip;
	gboolean user_sentby = FALSE;

	g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), FALSE);

	if (!e_cal_component_has_organizer (comp) ||
		e_client_check_capability (
		E_CLIENT (cal_client), CAL_STATIC_CAPABILITY_NO_ORGANIZER))
		return FALSE;

	e_cal_component_get_organizer (comp, &organizer);
	if (organizer.sentby != NULL) {
		strip = itip_strip_mailto (organizer.sentby);
		user_sentby = itip_address_is_user (registry, strip);
	}

	return user_sentby;
}

static ECalComponentAttendee *
get_attendee (GSList *attendees,
              gchar *address)
{
	GSList *l;

	if (!address)
		return NULL;

	for (l = attendees; l; l = l->next) {
		ECalComponentAttendee *attendee = l->data;

		if (!g_ascii_strcasecmp (itip_strip_mailto (attendee->value), address)) {
			return attendee;
		}
	}

	return NULL;
}

static ECalComponentAttendee *
get_attendee_if_attendee_sentby_is_user (GSList *attendees,
                                         gchar *address)
{
	GSList *l;

	for (l = attendees; l; l = l->next) {
		ECalComponentAttendee *attendee = l->data;

		if (attendee->sentby && g_str_equal (
			itip_strip_mailto (attendee->sentby), address)) {
			return attendee;
		}
	}

	return NULL;
}

static gchar *
html_new_lines_for (const gchar *string)
{
	gchar **lines;
	gchar *joined;

	lines = g_strsplit_set (string, "\n", -1);
	joined = g_strjoinv ("<br>", lines);
	g_strfreev (lines);

	return joined;
}

gchar *
itip_get_comp_attendee (ESourceRegistry *registry,
                        ECalComponent *comp,
                        ECalClient *cal_client)
{
	ESource *source;
	GSList *attendees;
	ECalComponentAttendee *attendee = NULL;
	GList *list, *link;
	const gchar *extension_name;
	gchar *address = NULL;

	e_cal_component_get_attendee_list (comp, &attendees);

	if (cal_client)
		e_client_get_backend_property_sync (
			E_CLIENT (cal_client),
			CAL_BACKEND_PROPERTY_CAL_EMAIL_ADDRESS,
			&address, NULL, NULL);

	if (address != NULL && *address != '\0') {
		attendee = get_attendee (attendees, address);

		if (attendee) {
			gchar *user_email;

			user_email = g_strdup (
				itip_strip_mailto (attendee->value));
			e_cal_component_free_attendee_list (attendees);
			g_free (address);

			return user_email;
		}

		attendee = get_attendee_if_attendee_sentby_is_user (
			attendees, address);

		if (attendee != NULL) {
			gchar *user_email;

			user_email = g_strdup (
				itip_strip_mailto (attendee->sentby));
			e_cal_component_free_attendee_list (attendees);
			g_free (address);

			return user_email;
		}

		g_free (address);
		address = NULL;
	}

	extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;
	list = e_source_registry_list_enabled (registry, extension_name);

	for (link = list; link != NULL; link = g_list_next (link)) {
		ESourceExtension *extension;

		source = E_SOURCE (link->data);

		extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;
		extension = e_source_get_extension (source, extension_name);

		address = e_source_mail_identity_dup_address (
			E_SOURCE_MAIL_IDENTITY (extension));

		if (address == NULL)
			continue;

		attendee = get_attendee (attendees, address);
		if (attendee != NULL) {
			gchar *user_email;

			user_email = g_strdup (
				itip_strip_mailto (attendee->value));
			e_cal_component_free_attendee_list (attendees);

			g_free (address);

			return user_email;
		}

		/* If the account was not found in the attendees list, then
		 * let's check the 'sentby' fields of the attendees if we can
		 * find the account. */
		attendee = get_attendee_if_attendee_sentby_is_user (
			attendees, address);
		if (attendee) {
			gchar *user_email;

			user_email = g_strdup (
				itip_strip_mailto (attendee->sentby));
			e_cal_component_free_attendee_list (attendees);

			g_free (address);

			return user_email;
		}

		g_free (address);
	}

	g_list_free_full (list, (GDestroyNotify) g_object_unref);

	/* We could not find the attendee in the component, so just give
	 * the default account address if the email address is not set in
	 * the backend. */
	/* FIXME do we have a better way ? */
	itip_get_default_name_and_address (registry, NULL, &address);

	e_cal_component_free_attendee_list (attendees);

	if (address == NULL)
		address = g_strdup ("");

	return address;
}

const gchar *
itip_strip_mailto (const gchar *address)
{
	if (address == NULL)
		return NULL;

	if (!g_ascii_strncasecmp (address, "mailto:", 7))
		address += 7;

	return address;
}

static gchar *
get_label (struct icaltimetype *tt,
           gboolean use_24_hour_format)
{
	gchar buffer[1000];
	struct tm tmp_tm;

	tmp_tm = icaltimetype_to_tm (tt);

	e_time_format_date_and_time (
		&tmp_tm, use_24_hour_format, FALSE, FALSE, buffer, 1000);

	return g_strdup (buffer);
}

typedef struct {
	GHashTable *tzids;
	icalcomponent *icomp;
	ECalClient *client;
	icalcomponent *zones;
} ItipUtilTZData;

static void
foreach_tzid_callback (icalparameter *param,
                       gpointer data)
{
	ItipUtilTZData *tz_data = data;
	const gchar *tzid;
	icaltimezone *zone = NULL;
	icalcomponent *vtimezone_comp;

	/* Get the TZID string from the parameter. */
	tzid = icalparameter_get_tzid (param);
	if (!tzid || g_hash_table_lookup (tz_data->tzids, tzid))
		return;

	/* Look for the timezone */
	if (tz_data->zones != NULL)
		zone = icalcomponent_get_timezone (tz_data->zones, tzid);
	if (zone == NULL)
		zone = icaltimezone_get_builtin_timezone_from_tzid (tzid);
	if (zone == NULL && tz_data->client != NULL)
		e_cal_client_get_timezone_sync (tz_data->client, tzid, &zone, NULL, NULL);
	if (zone == NULL)
		return;

	/* Convert it to a string and add it to the hash. */
	vtimezone_comp = icaltimezone_get_component (zone);
	if (!vtimezone_comp)
		return;

	icalcomponent_add_component (
		tz_data->icomp, icalcomponent_new_clone (vtimezone_comp));
	g_hash_table_insert (tz_data->tzids, (gchar *) tzid, (gchar *) tzid);
}

static icalcomponent *
comp_toplevel_with_zones (ECalComponentItipMethod method,
                          ECalComponent *comp,
                          ECalClient *cal_client,
                          icalcomponent *zones)
{
	icalcomponent *top_level, *icomp;
	icalproperty *prop;
	icalvalue *value;
	ItipUtilTZData tz_data;

	top_level = e_cal_util_new_top_level ();

	prop = icalproperty_new (ICAL_METHOD_PROPERTY);
	value = icalvalue_new_method (itip_methods_enum[method]);
	icalproperty_set_value (prop, value);
	icalcomponent_add_property (top_level, prop);

	icomp = e_cal_component_get_icalcomponent (comp);
	icomp = icalcomponent_new_clone (icomp);

	tz_data.tzids = g_hash_table_new (g_str_hash, g_str_equal);
	tz_data.icomp = top_level;
	tz_data.client = cal_client;
	tz_data.zones = zones;
	icalcomponent_foreach_tzid (icomp, foreach_tzid_callback, &tz_data);
	g_hash_table_destroy (tz_data.tzids);

	icalcomponent_add_component (top_level, icomp);

	return top_level;
}

static gboolean
users_has_attendee (const GSList *users,
                    const gchar *address)
{
	const GSList *l;

	for (l = users; l != NULL; l = l->next) {
		if (!g_ascii_strcasecmp (address, l->data))
			return TRUE;
	}

	return FALSE;
}

static gchar *
comp_from (ECalComponentItipMethod method,
           ECalComponent *comp,
           ESourceRegistry *registry)
{
	ECalComponentOrganizer organizer;
	ECalComponentAttendee *attendee;
	GSList *attendees;
	gchar *from;
	gchar *sender = NULL;

	switch (method) {
	case E_CAL_COMPONENT_METHOD_PUBLISH:
		return NULL;

	case E_CAL_COMPONENT_METHOD_REQUEST:
		return itip_get_comp_attendee (registry, comp, NULL);

	case E_CAL_COMPONENT_METHOD_REPLY:
		sender = itip_get_comp_attendee (registry, comp, NULL);
		if (sender != NULL)
			return sender;
		if (!e_cal_component_has_attendees (comp))
			return NULL;
		/* coverity[fallthrough] */

	case E_CAL_COMPONENT_METHOD_CANCEL:

	case E_CAL_COMPONENT_METHOD_ADD:

		e_cal_component_get_organizer (comp, &organizer);
		if (organizer.value == NULL) {
			e_notice (
				NULL, GTK_MESSAGE_ERROR,
				_("An organizer must be set."));
			return NULL;
		}
		return g_strdup (itip_strip_mailto (organizer.value));

	default:
		if (!e_cal_component_has_attendees (comp))
			return NULL;

		e_cal_component_get_attendee_list (comp, &attendees);
		attendee = attendees->data;
		if (attendee->value != NULL)
			from = g_strdup (itip_strip_mailto (attendee->value));
		else
			from = NULL;
		e_cal_component_free_attendee_list (attendees);

		return from;
	}
}

static EDestination **
comp_to_list (ESourceRegistry *registry,
              ECalComponentItipMethod method,
              ECalComponent *comp,
              const GSList *users,
              gboolean reply_all,
              const GSList *only_attendees)
{
	ECalComponentOrganizer organizer;
	GSList *attendees, *l;
	GPtrArray *array = NULL;
	EDestination *destination;
	gint len;
	gchar *sender = NULL;

	union {
		gpointer *pdata;
		EDestination **destinations;
	} convert;

	switch (method) {
	case E_CAL_COMPONENT_METHOD_REQUEST:
	case E_CAL_COMPONENT_METHOD_CANCEL:
		e_cal_component_get_attendee_list (comp, &attendees);
		len = g_slist_length (attendees);
		if (len <= 0) {
			e_notice (
				NULL, GTK_MESSAGE_ERROR,
				_("At least one attendee is necessary"));
			e_cal_component_free_attendee_list (attendees);
			return NULL;
		}

		e_cal_component_get_organizer (comp, &organizer);
		if (organizer.value == NULL) {
			e_notice (
				NULL, GTK_MESSAGE_ERROR,
				_("An organizer must be set."));
			return NULL;
		}

		array = g_ptr_array_new ();

		sender = itip_get_comp_attendee (registry, comp, NULL);

		for (l = attendees; l != NULL; l = l->next) {
			ECalComponentAttendee *att = l->data;

			/* Bugfix: 688711 - Varadhan
			 * Resource is also considered as a "attendee". If the respective backend
			 * is able to successfully book resources automagically, it will appear
			 * in the users list and thereby won't get added to the list of destinations
			 * to send the meeting invite, otherwise, as a safety measure, a meeting
			 * invite will be sent to the resources as well. */
			if (att->cutype != ICAL_CUTYPE_INDIVIDUAL &&
			    att->cutype != ICAL_CUTYPE_GROUP &&
			    att->cutype != ICAL_CUTYPE_RESOURCE &&
			    att->cutype != ICAL_CUTYPE_UNKNOWN)
				continue;
			else if (users_has_attendee (users, att->value))
				continue;
			else if (att->sentby &&
				users_has_attendee (users, att->sentby))
				continue;
			else if (!g_ascii_strcasecmp (
				att->value, organizer.value))
				continue;
			else if (att->sentby && !g_ascii_strcasecmp (
				att->sentby, organizer.sentby))
				continue;
			else if (!g_ascii_strcasecmp (
				itip_strip_mailto (att->value), sender))
				continue;
			else if (att->status == ICAL_PARTSTAT_DELEGATED &&
				(att->delto && *att->delto) && !(att->rsvp) &&
				method == E_CAL_COMPONENT_METHOD_REQUEST)
				continue;
			else if (only_attendees &&
				!comp_editor_have_in_new_attendees_lst (
				only_attendees, itip_strip_mailto (att->value)))
				continue;

			destination = e_destination_new ();
			if (att->cn != NULL)
				e_destination_set_name (destination, att->cn);
			e_destination_set_email (
				destination, itip_strip_mailto (att->value));
			g_ptr_array_add (array, destination);
		}
		g_free (sender);
		e_cal_component_free_attendee_list (attendees);
		break;

	case E_CAL_COMPONENT_METHOD_REPLY:

		if (reply_all) {
			e_cal_component_get_attendee_list (comp, &attendees);
			len = g_slist_length (attendees);

			if (len <= 0)
				return NULL;

			array = g_ptr_array_new ();

			sender = itip_get_comp_attendee (registry, comp, NULL);

			e_cal_component_get_organizer (comp, &organizer);
			if (organizer.value && (!sender || g_ascii_strcasecmp (
			    itip_strip_mailto (organizer.value), sender) != 0)) {
				destination = e_destination_new ();
				e_destination_set_email (
					destination,
					itip_strip_mailto (organizer.value));
				if (organizer.cn)
					e_destination_set_name (destination, organizer.cn);
				g_ptr_array_add (array, destination);
			}

			for (l = attendees; l != NULL; l = l->next) {
				ECalComponentAttendee *att = l->data;

				if (!att->value)
					continue;
				else if (att->cutype != ICAL_CUTYPE_INDIVIDUAL &&
					 att->cutype != ICAL_CUTYPE_GROUP &&
					 att->cutype != ICAL_CUTYPE_UNKNOWN)
					continue;
				else if (only_attendees &&
					!comp_editor_have_in_new_attendees_lst (
					only_attendees, itip_strip_mailto (att->value)))
					continue;
				else if (organizer.value &&
					 g_ascii_strcasecmp (att->value, organizer.value) == 0)
					continue;
				else if (sender && g_ascii_strcasecmp (
					itip_strip_mailto (att->value), sender) == 0)
					continue;

				destination = e_destination_new ();
				if (att->cn != NULL)
					e_destination_set_name (destination, att->cn);
				e_destination_set_email (
					destination, itip_strip_mailto (att->value));
				g_ptr_array_add (array, destination);
			}

			g_free (sender);
			e_cal_component_free_attendee_list (attendees);

		} else {
			array = g_ptr_array_new ();

			destination = e_destination_new ();
			e_cal_component_get_organizer (comp, &organizer);
			if (organizer.cn)
				e_destination_set_name (destination, organizer.cn);
			if (organizer.value)
				e_destination_set_email (
					destination, itip_strip_mailto (organizer.value));
			g_ptr_array_add (array, destination);
		}
		break;

	case E_CAL_COMPONENT_METHOD_ADD:
	case E_CAL_COMPONENT_METHOD_REFRESH:
	case E_CAL_COMPONENT_METHOD_COUNTER:
	case E_CAL_COMPONENT_METHOD_DECLINECOUNTER:
		e_cal_component_get_organizer (comp, &organizer);
		if (organizer.value == NULL) {
			e_notice (
				NULL, GTK_MESSAGE_ERROR,
				_("An organizer must be set."));
			return NULL;
		}

		array = g_ptr_array_new ();

		destination = e_destination_new ();
		if (organizer.cn != NULL)
			e_destination_set_name (destination, organizer.cn);
		e_destination_set_email (
			destination, itip_strip_mailto (organizer.value));
		g_ptr_array_add (array, destination);

		/* send the status to delegatee to the delegate also*/
		e_cal_component_get_attendee_list (comp, &attendees);
		sender = itip_get_comp_attendee (registry, comp, NULL);

		for (l = attendees; l != NULL; l = l->next) {
			ECalComponentAttendee *att = l->data;

			if (att->cutype != ICAL_CUTYPE_INDIVIDUAL &&
			    att->cutype != ICAL_CUTYPE_GROUP &&
			    att->cutype != ICAL_CUTYPE_UNKNOWN)
				continue;

			if (!g_ascii_strcasecmp (
				itip_strip_mailto (att->value), sender) ||
				(att->sentby && !g_ascii_strcasecmp (
				itip_strip_mailto (att->sentby), sender))) {

				if (!(att->delfrom && *att->delfrom))
					break;

				destination = e_destination_new ();
				e_destination_set_email (
					destination, itip_strip_mailto (att->delfrom));
				g_ptr_array_add (array, destination);
			}

		}
		e_cal_component_free_attendee_list (attendees);

		break;
	case E_CAL_COMPONENT_METHOD_PUBLISH:
		if (users) {
			const GSList *list;

			array = g_ptr_array_new ();

			for (list = users; list != NULL; list = list->next) {
				destination = e_destination_new ();
				e_destination_set_email (destination, list->data);
				g_ptr_array_add (array, destination);
			}

			break;
		}
	default:
		break;
	}

	if (array == NULL)
		return NULL;

	g_ptr_array_add (array, NULL);
	convert.pdata = g_ptr_array_free (array, FALSE);

	return convert.destinations;
}

static gchar *
comp_subject (ESourceRegistry *registry,
              ECalComponentItipMethod method,
              ECalComponent *comp)
{
	ECalComponentText caltext;
	const gchar *description, *prefix = NULL;
	GSList *alist, *l;
	gchar *subject;
	gchar *sender;
	ECalComponentAttendee *a = NULL;

	e_cal_component_get_summary (comp, &caltext);
	if (caltext.value != NULL)
		description = caltext.value;
	else {
		switch (e_cal_component_get_vtype (comp)) {
		case E_CAL_COMPONENT_EVENT:
			description = _("Event information");
			break;
		case E_CAL_COMPONENT_TODO:
			description = _("Task information");
			break;
		case E_CAL_COMPONENT_JOURNAL:
			description = _("Memo information");
			break;
		case E_CAL_COMPONENT_FREEBUSY:
			description = _("Free/Busy information");
			break;
		default:
			description = _("Calendar information");
		}
	}

	switch (method) {
	case E_CAL_COMPONENT_METHOD_PUBLISH:
	case E_CAL_COMPONENT_METHOD_REQUEST:
		/* FIXME: If this is an update to a previous
		 * PUBLISH or REQUEST, then
			prefix = U_("Updated");
		 */
		break;

	case E_CAL_COMPONENT_METHOD_REPLY:
		e_cal_component_get_attendee_list (comp, &alist);
		sender = itip_get_comp_attendee (registry, comp, NULL);
		if (sender) {

			for (l = alist; l != NULL; l = l->next) {
				a = l->data;
				if ((sender && *sender) && (g_ascii_strcasecmp (
					itip_strip_mailto (a->value), sender) ||
					(a->sentby && g_ascii_strcasecmp (
					itip_strip_mailto (a->sentby), sender))))
					break;
			}
			g_free (sender);
		}

		if (a != NULL) {

			switch (a->status) {
			case ICAL_PARTSTAT_ACCEPTED:
				/* Translators: This is part of the subject
				 * line of a meeting request or update email.
				 * The full subject line would be:
				 * "Accepted: Meeting Name". */
				prefix = C_("Meeting", "Accepted");
				break;
			case ICAL_PARTSTAT_TENTATIVE:
				/* Translators: This is part of the subject
				 * line of a meeting request or update email.
				 * The full subject line would be:
				 * "Tentatively Accepted: Meeting Name". */
				prefix = C_("Meeting", "Tentatively Accepted");
				break;
			case ICAL_PARTSTAT_DECLINED:
				/* Translators: This is part of the subject
				 * line of a meeting request or update email.
				 * The full subject line would be:
				 * "Declined: Meeting Name". */
				prefix = C_("Meeting", "Declined");
				break;
			case ICAL_PARTSTAT_DELEGATED:
				/* Translators: This is part of the subject
				 * line of a meeting request or update email.
				 * The full subject line would be:
				 * "Delegated: Meeting Name". */
				prefix = C_("Meeting", "Delegated");
				break;
			default:
				break;
			}
			e_cal_component_free_attendee_list (alist);
		}
		break;

	case E_CAL_COMPONENT_METHOD_ADD:
		/* Translators: This is part of the subject line of a
		 * meeting request or update email.  The full subject
		 * line would be: "Updated: Meeting Name". */
		prefix = C_("Meeting", "Updated");
		break;

	case E_CAL_COMPONENT_METHOD_CANCEL:
		/* Translators: This is part of the subject line of a
		 * meeting request or update email.  The full subject
		 * line would be: "Cancel: Meeting Name". */
		prefix = C_("Meeting", "Cancel");
		break;

	case E_CAL_COMPONENT_METHOD_REFRESH:
		/* Translators: This is part of the subject line of a
		 * meeting request or update email.  The full subject
		 * line would be: "Refresh: Meeting Name". */
		prefix = C_("Meeting", "Refresh");
		break;

	case E_CAL_COMPONENT_METHOD_COUNTER:
		/* Translators: This is part of the subject line of a
		 * meeting request or update email.  The full subject
		 * line would be: "Counter-proposal: Meeting Name". */
		prefix = C_("Meeting", "Counter-proposal");
		break;

	case E_CAL_COMPONENT_METHOD_DECLINECOUNTER:
		/* Translators: This is part of the subject line of a
		 * meeting request or update email.  The full subject
		 * line would be: "Declined: Meeting Name". */
		prefix = C_("Meeting", "Declined");
		break;

	default:
		break;
	}

	if (prefix != NULL)
		subject = g_strdup_printf ("%s: %s", prefix, description);
	else
		subject = g_strdup (description);

	return subject;
}

static gchar *
comp_content_type (ECalComponent *comp,
                   ECalComponentItipMethod method)
{
	const gchar *name;

	if (e_cal_component_get_vtype (comp) == E_CAL_COMPONENT_FREEBUSY)
		name = "freebusy.ifb";
	else
		name = "calendar.ics";

	return g_strdup_printf (
		"text/calendar; name=\"%s\"; charset=utf-8; METHOD=%s",
		name, itip_methods[method]);
}

static const gchar *
comp_filename (ECalComponent *comp)
{
	if (e_cal_component_get_vtype (comp) == E_CAL_COMPONENT_FREEBUSY)
		return "freebusy.ifb";
	else
		return "calendar.ics";
}

static gchar *
comp_description (ECalComponent *comp,
                  gboolean use_24_hour_format)
{
	gchar *description;
	ECalComponentDateTime dt;
	gchar *start = NULL, *end = NULL;

	switch (e_cal_component_get_vtype (comp)) {
	case E_CAL_COMPONENT_EVENT:
		description = g_strdup (_("Event information"));
		break;
	case E_CAL_COMPONENT_TODO:
		description = g_strdup (_("Task information"));
		break;
	case E_CAL_COMPONENT_JOURNAL:
		description = g_strdup (_("Memo information"));
		break;
	case E_CAL_COMPONENT_FREEBUSY:
		e_cal_component_get_dtstart (comp, &dt);
		if (dt.value)
			start = get_label (dt.value, use_24_hour_format);
		e_cal_component_free_datetime (&dt);

		e_cal_component_get_dtend (comp, &dt);
		if (dt.value)
			end = get_label (dt.value, use_24_hour_format);
		e_cal_component_free_datetime (&dt);

		if (start != NULL && end != NULL)
			description = g_strdup_printf (
				_("Free/Busy information (%s to %s)"),
				start, end);
		else
			description = g_strdup (_("Free/Busy information"));
		g_free (start);
		g_free (end);
		break;
	default:
		description = g_strdup (_("iCalendar information"));
		break;
	}

	return description;
}

static gboolean
comp_server_send (ECalComponentItipMethod method,
                  ECalComponent *comp,
                  ECalClient *cal_client,
                  icalcomponent *zones,
                  GSList **users)
{
	icalcomponent *top_level, *returned_icalcomp = NULL;
	gboolean retval = TRUE;
	GError *error = NULL;

	top_level = comp_toplevel_with_zones (method, comp, cal_client, zones);
	d (printf ("itip-utils.c: comp_server_send: calling e_cal_send_objects... \n"));

	e_cal_client_send_objects_sync (
		cal_client, top_level, users,
		&returned_icalcomp, NULL, &error);

	if (g_error_matches (error, E_CAL_CLIENT_ERROR, E_CAL_CLIENT_ERROR_OBJECT_ID_ALREADY_EXISTS)) {
		e_notice (
			NULL, GTK_MESSAGE_ERROR,
			_("Unable to book a resource, the "
			"new event collides with some other."));
		g_error_free (error);
		retval = FALSE;

	} else if (error != NULL) {
		e_notice (
			NULL, GTK_MESSAGE_ERROR,
			_("Unable to book a resource, error: %s"),
			error->message);
		g_error_free (error);
		retval = FALSE;
	}

	if (returned_icalcomp != NULL)
		icalcomponent_free (returned_icalcomp);
	icalcomponent_free (top_level);

	return retval;
}

static gboolean
comp_limit_attendees (ESourceRegistry *registry,
                      ECalComponent *comp)
{
	icalcomponent *icomp;
	icalproperty *prop;
	gboolean found = FALSE, match = FALSE;
	GSList *l, *list = NULL;

	icomp = e_cal_component_get_icalcomponent (comp);

	for (prop = icalcomponent_get_first_property (icomp, ICAL_ATTENDEE_PROPERTY);
	     prop != NULL;
	     prop = icalcomponent_get_next_property (icomp, ICAL_ATTENDEE_PROPERTY))
	{
		gchar *attendee;
		gchar *attendee_text;
		icalparameter *param;
		const gchar *attendee_sentby;
		gchar *attendee_sentby_text = NULL;

		/* If we've already found something, just erase the rest */
		if (found) {
			list = g_slist_prepend (list, prop);
			continue;
		}

		attendee = icalproperty_get_value_as_string_r (prop);
		if (!attendee)
			continue;

		attendee_text = g_strdup (itip_strip_mailto (attendee));
		g_free (attendee);
		attendee_text = g_strstrip (attendee_text);
		found = match = itip_address_is_user (registry, attendee_text);

		if (!found) {
			param = icalproperty_get_first_parameter (prop, ICAL_SENTBY_PARAMETER);
			if (param) {
				attendee_sentby =
					icalparameter_get_sentby (param);
				attendee_sentby =
					itip_strip_mailto (attendee_sentby);
				attendee_sentby_text =
					g_strstrip (g_strdup (attendee_sentby));
				found = match = itip_address_is_user (
					registry, attendee_sentby_text);
			}
		}

		g_free (attendee_text);
		g_free (attendee_sentby_text);

		if (!match)
			list = g_slist_prepend (list, prop);
	}

	for (l = list; l != NULL; l = l->next) {
		prop = l->data;

		icalcomponent_remove_property (icomp, prop);
		icalproperty_free (prop);
	}
	g_slist_free (list);

	return found;
}

static void
comp_sentby (ECalComponent *comp,
             ECalClient *cal_client,
             ESourceRegistry *registry)
{
	ECalComponentOrganizer organizer;
	GSList * attendees, *l;
	gchar *name;
	gchar *address;
	gchar *user = NULL;

	itip_get_default_name_and_address (registry, &name, &address);

	e_cal_component_get_organizer (comp, &organizer);
	if (!organizer.value && name != NULL && address != NULL) {
		organizer.value = g_strdup_printf ("MAILTO:%s", address);
		organizer.sentby = NULL;
		organizer.cn = name;
		organizer.language = NULL;

		e_cal_component_set_organizer (comp, &organizer);
		g_free ((gchar *) organizer.value);

		g_free (name);
		g_free (address);
		return;
	}

	e_cal_component_get_attendee_list (comp, &attendees);
	user = itip_get_comp_attendee (registry, comp, cal_client);
	for (l = attendees; l; l = l->next) {
		ECalComponentAttendee *a = l->data;

		if (!g_ascii_strcasecmp (
			itip_strip_mailto (a->value), user) ||
			(a->sentby && !g_ascii_strcasecmp (
			itip_strip_mailto (a->sentby), user))) {
			g_free (user);

			g_free (name);
			g_free (address);
			return;
		}
	}

	if (!itip_organizer_is_user (registry, comp, cal_client) &&
	    !itip_sentby_is_user (registry, comp, cal_client) &&
	    address != NULL) {
		organizer.value = g_strdup (organizer.value);
		organizer.sentby = g_strdup_printf ("MAILTO:%s", address);
		organizer.cn = g_strdup (organizer.cn);
		organizer.language = g_strdup (organizer.language);

		e_cal_component_set_organizer (comp, &organizer);

		g_free ((gchar *) organizer.value);
		g_free ((gchar *) organizer.sentby);
		g_free ((gchar *) organizer.cn);
		g_free ((gchar *) organizer.language);
	}

	g_free (name);
	g_free (address);
}

static ECalComponent *
comp_minimal (ESourceRegistry *registry,
              ECalComponent *comp,
              gboolean attendee)
{
	ECalComponent *clone;
	icalcomponent *icomp, *icomp_clone;
	icalproperty *prop;
	ECalComponentOrganizer organizer;
	const gchar *uid;
	GSList *comments;
	struct icaltimetype itt;
	ECalComponentRange recur_id;

	clone = e_cal_component_new ();
	e_cal_component_set_new_vtype (clone, e_cal_component_get_vtype (comp));

	if (attendee) {
		GSList *attendees;

		e_cal_component_get_attendee_list (comp, &attendees);
		e_cal_component_set_attendee_list (clone, attendees);

		if (!comp_limit_attendees (registry, clone)) {
			e_notice (
				NULL, GTK_MESSAGE_ERROR,
				_("You must be an attendee of the event."));
			goto error;
		}
	}

	itt = icaltime_from_timet_with_zone (
		time (NULL), FALSE,
		icaltimezone_get_utc_timezone ());
	e_cal_component_set_dtstamp (clone, &itt);

	e_cal_component_get_organizer (comp, &organizer);
	if (organizer.value == NULL)
		goto error;
	e_cal_component_set_organizer (clone, &organizer);

	e_cal_component_get_uid (comp, &uid);
	e_cal_component_set_uid (clone, uid);

	e_cal_component_get_comment_list (comp, &comments);
	if (g_slist_length (comments) <= 1) {
		e_cal_component_set_comment_list (clone, comments);
	} else {
		GSList *l = comments;

		comments = g_slist_remove_link (comments, l);
		e_cal_component_set_comment_list (clone, l);
		e_cal_component_free_text_list (l);
	}
	e_cal_component_free_text_list (comments);

	e_cal_component_get_recurid (comp, &recur_id);
	if (recur_id.datetime.value != NULL)
		e_cal_component_set_recurid (clone, &recur_id);

	icomp = e_cal_component_get_icalcomponent (comp);
	icomp_clone = e_cal_component_get_icalcomponent (clone);
	for (prop = icalcomponent_get_first_property (icomp, ICAL_X_PROPERTY);
	     prop != NULL;
	     prop = icalcomponent_get_next_property (icomp, ICAL_X_PROPERTY))
	{
		icalproperty *p;

		p = icalproperty_new_clone (prop);
		icalcomponent_add_property (icomp_clone, p);
	}

	e_cal_component_rescan (clone);

	return clone;

 error:
	g_object_unref (clone);
	return NULL;
}

static void
strip_x_microsoft_props (ECalComponent *comp)
{
	GSList *lst = NULL, *l;
	icalcomponent *icalcomp;
	icalproperty *icalprop;

	g_return_if_fail (comp != NULL);

	icalcomp = e_cal_component_get_icalcomponent (comp);
	g_return_if_fail (icalcomp != NULL);

	for (icalprop = icalcomponent_get_first_property (icalcomp, ICAL_X_PROPERTY);
	     icalprop;
	     icalprop = icalcomponent_get_next_property (icalcomp, ICAL_X_PROPERTY)) {
		const gchar *x_name = icalproperty_get_x_name (icalprop);

		if (x_name && g_ascii_strncasecmp (x_name, "X-MICROSOFT-", 12) == 0)
			lst = g_slist_prepend (lst, icalprop);
	}

	for (l = lst; l != NULL; l = l->next) {
		icalprop = l->data;
		icalcomponent_remove_property (icalcomp, icalprop);
		icalproperty_free (icalprop);
	}

	g_slist_free (lst);
}

static ECalComponent *
comp_compliant (ESourceRegistry *registry,
                ECalComponentItipMethod method,
                ECalComponent *comp,
                ECalClient *client,
                icalcomponent *zones,
                icaltimezone *default_zone,
                gboolean strip_alarms)
{
	ECalComponent *clone, *temp_clone;
	struct icaltimetype itt;

	clone = e_cal_component_clone (comp);
	itt = icaltime_from_timet_with_zone (
		time (NULL), FALSE,
		icaltimezone_get_utc_timezone ());
	e_cal_component_set_dtstamp (clone, &itt);

	/* Make UNTIL date a datetime in a simple recurrence */
	if (e_cal_component_has_recurrences (clone)
	    && e_cal_component_has_simple_recurrence (clone)) {
		GSList *rrule_list;
		struct icalrecurrencetype *r;

		e_cal_component_get_rrule_list (clone, &rrule_list);
		r = rrule_list->data;

		if (!icaltime_is_null_time (r->until) && r->until.is_date) {
			ECalComponentDateTime dt;
			icaltimezone *from_zone = NULL, *to_zone;

			e_cal_component_get_dtstart (clone, &dt);

			if (dt.value->is_date) {
				from_zone = default_zone;
			} else if (dt.tzid == NULL) {
				from_zone = icaltimezone_get_utc_timezone ();
			} else {
				if (zones != NULL)
					from_zone = icalcomponent_get_timezone (zones, dt.tzid);
				if (from_zone == NULL)
					from_zone = icaltimezone_get_builtin_timezone_from_tzid (dt.tzid);
				if (from_zone == NULL && client != NULL)
					/* FIXME Error checking */
					e_cal_client_get_timezone_sync (
						client, dt.tzid,
						&from_zone, NULL, NULL);
			}

			to_zone = icaltimezone_get_utc_timezone ();

			r->until.hour = dt.value->hour;
			r->until.minute = dt.value->minute;
			r->until.second = dt.value->second;
			r->until.is_date = FALSE;

			icaltimezone_convert_time (&r->until, from_zone, to_zone);
			r->until.is_utc = TRUE;

			e_cal_component_free_datetime (&dt);
			e_cal_component_set_rrule_list (clone, rrule_list);
			e_cal_component_abort_sequence (clone);
		}

		e_cal_component_free_recur_list (rrule_list);
	}

	/* We delete incoming alarms if requested, even this helps with outlook */
	if (strip_alarms) {
		e_cal_component_remove_all_alarms (clone);
	} else {
		/* Always strip procedure alarms, because of security */
		GList *uids, *l;

		uids = e_cal_component_get_alarm_uids (clone);

		for (l = uids; l; l = l->next) {
			ECalComponentAlarm *alarm;
			ECalComponentAlarmAction action = E_CAL_COMPONENT_ALARM_UNKNOWN;

			alarm = e_cal_component_get_alarm (clone, (const gchar *) l->data);
			if (alarm) {
				e_cal_component_alarm_get_action (alarm, &action);
				e_cal_component_alarm_free (alarm);

				if (action == E_CAL_COMPONENT_ALARM_PROCEDURE)
					e_cal_component_remove_alarm (clone, (const gchar *) l->data);
			}
		}

		cal_obj_uid_list_free (uids);
	}

	strip_x_microsoft_props (clone);

	/* Strip X-LIC-ERROR stuff */
	e_cal_component_strip_errors (clone);

	/* Comply with itip spec */
	switch (method) {
	case E_CAL_COMPONENT_METHOD_PUBLISH:
		comp_sentby (clone, client, registry);
		e_cal_component_set_attendee_list (clone, NULL);
		break;
	case E_CAL_COMPONENT_METHOD_REQUEST:
		comp_sentby (clone, client, registry);
		break;
	case E_CAL_COMPONENT_METHOD_CANCEL:
		comp_sentby (clone, client, registry);
		break;
	case E_CAL_COMPONENT_METHOD_REPLY:
		break;
	case E_CAL_COMPONENT_METHOD_ADD:
		break;
	case E_CAL_COMPONENT_METHOD_REFRESH:
		/* Need to remove almost everything */
		temp_clone = comp_minimal (registry, clone, TRUE);
		g_object_unref (clone);
		clone = temp_clone;
		break;
	case E_CAL_COMPONENT_METHOD_COUNTER:
		break;
	case E_CAL_COMPONENT_METHOD_DECLINECOUNTER:
		/* Need to remove almost everything */
		temp_clone = comp_minimal (registry, clone, FALSE);
		g_object_unref (clone);
		clone = temp_clone;
		break;
	default:
		break;
	}

	return clone;
}

static void
append_cal_attachments (EMsgComposer *composer,
                        ECalComponent *comp,
                        GSList *attach_list)
{
	struct CalMimeAttach *mime_attach;
	GSList *l;

	for (l = attach_list; l; l = l->next) {
		CamelMimePart *attachment;

		mime_attach = (struct CalMimeAttach *) l->data;

		attachment = camel_mime_part_new ();
		camel_mime_part_set_content (
			attachment, mime_attach->encoded_data,
			mime_attach->length, mime_attach->content_type);
		if (mime_attach->content_id)
			camel_mime_part_set_content_id (
				attachment, mime_attach->content_id);
		if (mime_attach->filename != NULL)
			camel_mime_part_set_filename (
				attachment, mime_attach->filename);
		if (mime_attach->description != NULL)
			camel_mime_part_set_description (
				attachment, mime_attach->description);
		if (mime_attach->disposition)
			camel_mime_part_set_disposition (
				attachment, "inline");
		else
			camel_mime_part_set_disposition (
				attachment, "attachment");
		e_msg_composer_attach (composer, attachment);
		g_object_unref (attachment);

		g_free (mime_attach->filename);
		g_free (mime_attach->content_type);
		g_free (mime_attach->content_id);
		g_free (mime_attach->description);
		g_free (mime_attach->encoded_data);
		g_free (mime_attach);
	}

	g_slist_free (attach_list);
}

static ESource *
find_enabled_identity (ESourceRegistry *registry,
                       const gchar *id_address)
{
	GList *list, *link;
	ESource *mail_identity = NULL;
	const gchar *extension_name;

	if (id_address == NULL)
		return NULL;

	extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;
	list = e_source_registry_list_enabled (registry, extension_name);

	for (link = list; link != NULL; link = g_list_next (link)) {
		ESource *source = E_SOURCE (link->data);
		ESourceMailIdentity *extension;
		const gchar *address;

		extension = e_source_get_extension (source, extension_name);
		address = e_source_mail_identity_get_address (extension);

		if (address == NULL)
			continue;

		if (g_ascii_strcasecmp (address, id_address) == 0) {
			mail_identity = g_object_ref (source);
			break;
		}
	}

	g_list_free_full (list, (GDestroyNotify) g_object_unref);

	return mail_identity;
}

static void
setup_from (ECalComponentItipMethod method,
            ECalComponent *comp,
            ECalClient *cal_client,
            EComposerHeaderTable *table)
{
	EClientCache *client_cache;
	ESourceRegistry *registry;
	ESource *source = NULL;

	client_cache = e_composer_header_table_ref_client_cache (table);
	registry = e_client_cache_ref_registry (client_cache);

	/* always use organizer's email when user is an organizer */
	if (itip_organizer_is_user (registry, comp, cal_client)) {
		ECalComponentOrganizer organizer = {0};

		e_cal_component_get_organizer (comp, &organizer);
		if (organizer.value != NULL)
			source = find_enabled_identity (
				registry,
				itip_strip_mailto (organizer.value));
	}

	if (source == NULL) {
		gchar *from = comp_from (method, comp, registry);

		if (from != NULL)
			source = find_enabled_identity (registry, from);

		g_free (from);
	}

	if (source != NULL) {
		const gchar *uid;

		uid = e_source_get_uid (source);
		e_composer_header_table_set_identity_uid (table, uid);

		g_object_unref (source);
	}

	g_object_unref (client_cache);
	g_object_unref (registry);
}

gboolean
itip_send_comp (ESourceRegistry *registry,
                ECalComponentItipMethod method,
                ECalComponent *send_comp,
                ECalClient *cal_client,
                icalcomponent *zones,
                GSList *attachments_list,
                GSList *users,
                gboolean strip_alarms,
                gboolean only_new_attendees)
{
	EShell *shell;
	GSettings *settings;
	EMsgComposer *composer;
	EComposerHeaderTable *table;
	EDestination **destinations;
	ECalComponent *comp = NULL;
	icalcomponent *top_level = NULL;
	icaltimezone *default_zone;
	gchar *ical_string = NULL;
	gchar *content_type = NULL;
	gchar *subject = NULL;
	gboolean use_24_hour_format;
	gboolean retval = FALSE;

	g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), FALSE);

	/* FIXME Pass this in. */
	shell = e_shell_get_default ();

	settings = g_settings_new ("org.gnome.evolution.calendar");

	use_24_hour_format =
		g_settings_get_boolean (settings, "use-24hour-format");

	g_object_unref (settings);

	default_zone = calendar_config_get_icaltimezone ();

	/* check whether backend could handle auto-saving requests/updates */
	if (method != E_CAL_COMPONENT_METHOD_PUBLISH && e_cal_client_check_save_schedules (cal_client))
		return TRUE;

	/* Give the server a chance to manipulate the comp */
	if (method != E_CAL_COMPONENT_METHOD_PUBLISH) {
		d (printf ("itip-utils.c: itip_send_comp: calling comp_server_send... \n"));
		if (!comp_server_send (method, send_comp, cal_client, zones, &users))
			goto cleanup;
	}

	/* check whether backend could handle sending requests/updates */
	if (method != E_CAL_COMPONENT_METHOD_PUBLISH &&
		e_client_check_capability (
			E_CLIENT (cal_client),
		CAL_STATIC_CAPABILITY_CREATE_MESSAGES)) {
		if (users) {
			g_slist_foreach (users, (GFunc) g_free, NULL);
			g_slist_free (users);
		}
		return TRUE;
	}

	/* Tidy up the comp */
	comp = comp_compliant (
		registry, method, send_comp, cal_client,
		zones, default_zone, strip_alarms);

	if (comp == NULL)
		goto cleanup;

	/* Recipients */
	destinations = comp_to_list (
		registry, method, comp, users, FALSE,
		only_new_attendees ? g_object_get_data (
		G_OBJECT (send_comp), "new-attendees") : NULL);
	if (method != E_CAL_COMPONENT_METHOD_PUBLISH) {
		if (destinations == NULL) {
			/* We sent them all via the server */
			retval = TRUE;
			goto cleanup;
		}
	}

	/* Subject information */
	subject = comp_subject (registry, method, comp);

	composer = e_msg_composer_new (shell);
	table = e_msg_composer_get_header_table (composer);

	setup_from (method, send_comp, cal_client, table);
	e_composer_header_table_set_subject (table, subject);
	e_composer_header_table_set_destinations_to (table, destinations);

	e_destination_freev (destinations);

	/* Content type */
	content_type = comp_content_type (comp, method);

	top_level = comp_toplevel_with_zones (method, comp, cal_client, zones);
	ical_string = icalcomponent_as_ical_string_r (top_level);

	if (e_cal_component_get_vtype (comp) == E_CAL_COMPONENT_EVENT) {
		e_msg_composer_set_body (composer, ical_string, content_type);
	} else {
		CamelMimePart *attachment;
		const gchar *filename;
		gchar *description;
		gchar *body;

		filename = comp_filename (comp);
		description = comp_description (comp, use_24_hour_format);

		body = camel_text_to_html (
			description, CAMEL_MIME_FILTER_TOHTML_PRE, 0);
		e_msg_composer_set_body_text (composer, body, TRUE);
		g_free (body);

		attachment = camel_mime_part_new ();
		camel_mime_part_set_content (
			attachment, ical_string,
			strlen (ical_string), content_type);
		if (filename != NULL && *filename != '\0')
			camel_mime_part_set_filename (attachment, filename);
		if (description != NULL && *description != '\0')
			camel_mime_part_set_description (attachment, description);
		camel_mime_part_set_disposition (attachment, "inline");
		e_msg_composer_attach (composer, attachment);
		g_object_unref (attachment);

		g_free (description);
	}

	append_cal_attachments (composer, comp, attachments_list);

	if ((method == E_CAL_COMPONENT_METHOD_PUBLISH) && !users)
		gtk_widget_show (GTK_WIDGET (composer));
	else
		e_msg_composer_send (composer);

	retval = TRUE;

cleanup:
	if (comp != NULL)
		g_object_unref (comp);
	if (top_level != NULL)
		icalcomponent_free (top_level);

	if (users) {
		g_slist_foreach (users, (GFunc) g_free, NULL);
		g_slist_free (users);
	}

	g_free (content_type);
	g_free (subject);
	g_free (ical_string);

	return retval;
}

gboolean
reply_to_calendar_comp (ESourceRegistry *registry,
                        ECalComponentItipMethod method,
                        ECalComponent *send_comp,
                        ECalClient *cal_client,
                        gboolean reply_all,
                        icalcomponent *zones,
                        GSList *attachments_list)
{
	EShell *shell;
	EMsgComposer *composer;
	EComposerHeaderTable *table;
	EDestination **destinations;
	ECalComponent *comp = NULL;
	icalcomponent *top_level = NULL;
	icaltimezone *default_zone;
	gchar *subject = NULL;
	gchar *ical_string = NULL;
	gboolean retval = FALSE;

	g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), FALSE);

	/* FIXME Pass this in. */
	shell = e_shell_get_default ();

	default_zone = calendar_config_get_icaltimezone ();

	/* Tidy up the comp */
	comp = comp_compliant (
		registry, method, send_comp, cal_client,
		zones, default_zone, TRUE);
	if (comp == NULL)
		goto cleanup;

	/* Recipients */
	destinations = comp_to_list (
		registry, method, comp, NULL, reply_all, NULL);

	/* Subject information */
	subject = comp_subject (registry, method, comp);

	composer = e_msg_composer_new (shell);
	table = e_msg_composer_get_header_table (composer);

	setup_from (method, send_comp, cal_client, table);
	e_composer_header_table_set_subject (table, subject);
	e_composer_header_table_set_destinations_to (table, destinations);

	e_destination_freev (destinations);

	top_level = comp_toplevel_with_zones (method, comp, cal_client, zones);
	ical_string = icalcomponent_as_ical_string_r (top_level);

	if (e_cal_component_get_vtype (comp) == E_CAL_COMPONENT_EVENT) {

		GString *body;
		gchar *orig_from = NULL;
		const gchar *description = NULL;
		gchar *subject = NULL;
		const gchar *location = NULL;
		gchar *time = NULL;
		gchar *html_description = NULL;
		GSList *text_list = NULL;
		ECalComponentOrganizer organizer;
		ECalComponentText text;
		ECalComponentDateTime dtstart;
		icaltimezone *start_zone = NULL;
		time_t start;

		e_cal_component_get_description_list (comp, &text_list);

		if (text_list) {
			ECalComponentText text = *((ECalComponentText *) text_list->data);
			if (text.value)
				description = text.value;
			else
				description = "";
		} else {
			description = "";
		}

		e_cal_component_free_text_list (text_list);

		e_cal_component_get_summary (comp, &text);
		if (text.value)
			subject = g_strdup (text.value);

		e_cal_component_get_organizer (comp, &organizer);
		if (organizer.value)
			orig_from = g_strdup (itip_strip_mailto (organizer.value));

		e_cal_component_get_location (comp, &location);
		if (!location)
			location = "Unspecified";

		e_cal_component_get_dtstart (comp, &dtstart);
		if (dtstart.value) {
			start_zone = icaltimezone_get_builtin_timezone_from_tzid (dtstart.tzid);
			if (!start_zone && dtstart.tzid) {
				GError *error = NULL;

				e_cal_client_get_timezone_sync (
					cal_client, dtstart.tzid,
					&start_zone, NULL, &error);

				if (error != NULL) {
					g_warning (
						"%s: Couldn't get timezone '%s' from server: %s",
						G_STRFUNC,
						dtstart.tzid ? dtstart.tzid : "",
						error->message);
					g_error_free (error);
				}
			}

			if (!start_zone || dtstart.value->is_date)
				start_zone = default_zone;

			start = icaltime_as_timet_with_zone (*dtstart.value, start_zone);
			time = g_strdup (ctime (&start));
		}

		body = g_string_new (
			"<br><br><hr><br><b>"
			"______ Original Appointment ______ "
			"</b><br><br><table>");

		if (orig_from && *orig_from)
			g_string_append_printf (
				body,
				"<tr><td><b>From</b></td>"
				"<td>:</td><td>%s</td></tr>", orig_from);
		g_free (orig_from);

		if (subject)
			g_string_append_printf (
				body,
				"<tr><td><b>Subject</b></td>"
				"<td>:</td><td>%s</td></tr>", subject);
		g_free (subject);

		g_string_append_printf (
			body,
			"<tr><td><b>Location</b></td>"
			"<td>:</td><td>%s</td></tr>", location);

		if (time)
			g_string_append_printf (
				body,
				"<tr><td><b>Time</b></td>"
				"<td>:</td><td>%s</td></tr>", time);
		g_free (time);

		g_string_append_printf (body, "</table><br>");

		html_description = html_new_lines_for (description);
		g_string_append (body, html_description);
		g_free (html_description);

		e_msg_composer_set_body_text (composer, body->str, TRUE);
		g_string_free (body, TRUE);
	}

	gtk_widget_show (GTK_WIDGET (composer));

	retval = TRUE;

 cleanup:

	if (comp != NULL)
		g_object_unref (comp);
	if (top_level != NULL)
		icalcomponent_free (top_level);

	g_free (subject);
	g_free (ical_string);
	return retval;
}

gboolean
itip_publish_begin (ECalComponent *pub_comp,
                    ECalClient *cal_client,
                    gboolean cloned,
                    ECalComponent **clone)
{
	icalcomponent *icomp = NULL, *icomp_clone = NULL;
	icalproperty *prop;

	if (e_cal_component_get_vtype (pub_comp) == E_CAL_COMPONENT_FREEBUSY) {

		if (!cloned)
			*clone = e_cal_component_clone (pub_comp);
		else {

			icomp = e_cal_component_get_icalcomponent (pub_comp);
			icomp_clone = e_cal_component_get_icalcomponent (*clone);
			for (prop = icalcomponent_get_first_property (icomp,
						      ICAL_FREEBUSY_PROPERTY);
				prop != NULL;
				prop = icalcomponent_get_next_property (
					icomp,
					ICAL_FREEBUSY_PROPERTY))
			{
				icalproperty *p;

				p = icalproperty_new_clone (prop);
				icalcomponent_add_property (icomp_clone, p);
			}
		}
	}

	return TRUE;
}

static gboolean
check_time (const struct icaltimetype tmval,
            gboolean can_null_time)
{
	if (icaltime_is_null_time (tmval))
		return can_null_time;

	return  icaltime_is_valid_time (tmval) &&
		tmval.month >= 1 && tmval.month <= 12 &&
		tmval.day >= 1 && tmval.day <= 31 &&
		tmval.hour >= 0 && tmval.hour < 24 &&
		tmval.minute >= 0 && tmval.minute < 60 &&
		tmval.second >= 0 && tmval.second < 60;
}

/* Returns whether the passed-in icalcomponent is valid or not.
 * It does some sanity checks on values too. */
gboolean
is_icalcomp_valid (icalcomponent *icalcomp)
{
	if (!icalcomp || !icalcomponent_is_valid (icalcomp))
		return FALSE;

	switch (icalcomponent_isa (icalcomp)) {
	case ICAL_VEVENT_COMPONENT:
		return	check_time (icalcomponent_get_dtstart (icalcomp), FALSE) &&
			check_time (icalcomponent_get_dtend (icalcomp), TRUE);
	case ICAL_VTODO_COMPONENT:
		return	check_time (icalcomponent_get_dtstart (icalcomp), TRUE) &&
			check_time (icalcomponent_get_due (icalcomp), TRUE);
	case ICAL_VJOURNAL_COMPONENT:
		return	check_time (icalcomponent_get_dtstart (icalcomp), TRUE) &&
			check_time (icalcomponent_get_dtend (icalcomp), TRUE);
	default:
		break;
	}

	return TRUE;
}

gboolean
itip_component_has_recipients (ECalComponent *comp)
{
	GSList *attendees = NULL;
	ECalComponentAttendee *attendee;
	ECalComponentOrganizer organizer;
	gboolean res = FALSE;

	g_return_val_if_fail (comp != NULL, FALSE);

	e_cal_component_get_organizer (comp, &organizer);
	e_cal_component_get_attendee_list (comp, &attendees);

	if (!attendees) {
		if (organizer.value && e_cal_component_get_vtype (comp) == E_CAL_COMPONENT_JOURNAL) {
			/* memos store recipients in an extra property */
			icalcomponent *icalcomp;
			icalproperty *icalprop;

			icalcomp = e_cal_component_get_icalcomponent (comp);

			for (icalprop = icalcomponent_get_first_property (icalcomp, ICAL_X_PROPERTY);
			     icalprop != NULL;
			     icalprop = icalcomponent_get_next_property (icalcomp, ICAL_X_PROPERTY)) {
				const gchar *x_name;

				x_name = icalproperty_get_x_name (icalprop);

				if (g_str_equal (x_name, "X-EVOLUTION-RECIPIENTS")) {
					const gchar *str_recipients = icalproperty_get_x (icalprop);

					res = str_recipients && g_ascii_strcasecmp (organizer.value, str_recipients) != 0;
					break;
				}
			}
		}

		return res;
	}

	if (g_slist_length (attendees) > 1 || !e_cal_component_has_organizer (comp)) {
		e_cal_component_free_attendee_list (attendees);
		return TRUE;
	}

	attendee = attendees->data;

	res = organizer.value && attendee && attendee->value && g_ascii_strcasecmp (organizer.value, attendee->value) != 0;

	e_cal_component_free_attendee_list (attendees);

	return res;
}