/* Evolution calendar - iCalendar component object
 *
 * Copyright (C) 2000 Ximian, Inc.
 * Copyright (C) 2000 Ximian, Inc.
 *
 * Author: Federico Mena-Quintero <federico@ximian.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 <string.h>
#include <stdlib.h>
#include <unistd.h>
#include "cal-component.h"
#include "timeutil.h"



/* Extension property for alarm components so that we can reference them by UID */
#define EVOLUTION_ALARM_UID_PROPERTY "X-EVOLUTION-ALARM-UID"

/* Private part of the CalComponent structure */
struct _CalComponentPrivate {
	/* The icalcomponent we wrap */
	icalcomponent *icalcomp;

	/* Properties */

	icalproperty *uid;

	icalproperty *status;

	struct attendee {
		icalproperty *prop;
		icalparameter *cutype_param;
		icalparameter *member_param;
		icalparameter *role_param;
		icalparameter *partstat_param;
		icalparameter *rsvp_param;
		icalparameter *delto_param;
		icalparameter *delfrom_param;
		icalparameter *sentby_param;
		icalparameter *cn_param;
		icalparameter *language_param;
	};
	
	GSList *attendee_list;
	
	icalproperty *categories;

	icalproperty *classification;

	struct text {
		icalproperty *prop;
		icalparameter *altrep_param;
	};

	GSList *comment_list; /* list of struct text */

	icalproperty *completed;

	GSList *contact_list; /* list of struct text */

	icalproperty *created;

	GSList *description_list; /* list of struct text */

	struct datetime {
		icalproperty *prop;
		icalparameter *tzid_param;
	};

	struct datetime dtstart;
	struct datetime dtend;

	icalproperty *dtstamp;

	struct datetime due;

	GSList *exdate_list; /* list of struct datetime */
	GSList *exrule_list; /* list of icalproperty objects */

	struct organizer {
		icalproperty *prop;
		icalparameter *sentby_param;
		icalparameter *cn_param;
		icalparameter *language_param;
	};

	struct organizer organizer;
	
	icalproperty *geo;
	icalproperty *last_modified;
	icalproperty *percent;
	icalproperty *priority;

	struct period {
		icalproperty *prop;
		icalparameter *value_param;
	};

	struct recur_id {
		struct datetime recur_time;
		
		icalparameter *range_param;
	};

	struct recur_id recur_id;
	
	GSList *rdate_list; /* list of struct period */

	GSList *rrule_list; /* list of icalproperty objects */

	icalproperty *sequence;

	struct {
		icalproperty *prop;
		icalparameter *altrep_param;
	} summary;

	icalproperty *transparency;
	icalproperty *url;

	/* Subcomponents */

	GHashTable *alarm_uid_hash;

	/* Whether we should increment the sequence number when piping the
	 * object over the wire.
	 */
	guint need_sequence_inc : 1;
};

/* Private structure for alarms */
struct _CalComponentAlarm {
	/* Alarm icalcomponent we wrap */
	icalcomponent *icalcomp;

	/* Our extension UID property */
	icalproperty *uid;

	/* Properties */

	icalproperty *action;
	icalproperty *attach; /* FIXME: see scan_alarm_property() below */

	struct {
		icalproperty *prop;
		icalparameter *altrep_param;
	} description;

	icalproperty *duration;
	icalproperty *repeat;
	icalproperty *trigger;
};



static void cal_component_class_init (CalComponentClass *class);
static void cal_component_init (CalComponent *comp);
static void cal_component_destroy (GtkObject *object);

static GtkObjectClass *parent_class;



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

	if (!cal_component_type) {
		static const GtkTypeInfo cal_component_info = {
			"CalComponent",
			sizeof (CalComponent),
			sizeof (CalComponentClass),
			(GtkClassInitFunc) cal_component_class_init,
			(GtkObjectInitFunc) cal_component_init,
			NULL, /* reserved_1 */
			NULL, /* reserved_2 */
			(GtkClassInitFunc) NULL
		};

		cal_component_type = gtk_type_unique (GTK_TYPE_OBJECT, &cal_component_info);
	}

	return cal_component_type;
}

/* Class initialization function for the calendar component object */
static void
cal_component_class_init (CalComponentClass *class)
{
	GtkObjectClass *object_class;

	object_class = (GtkObjectClass *) class;

	parent_class = gtk_type_class (GTK_TYPE_OBJECT);

	object_class->destroy = cal_component_destroy;
}

/* Object initialization function for the calendar component object */
static void
cal_component_init (CalComponent *comp)
{
	CalComponentPrivate *priv;

	priv = g_new0 (CalComponentPrivate, 1);
	comp->priv = priv;

	priv->alarm_uid_hash = g_hash_table_new (g_str_hash, g_str_equal);
}

/* Does a simple g_free() of the elements of a GSList and then frees the list
 * itself.  Returns NULL.
 */
static GSList *
free_slist (GSList *slist)
{
	GSList *l;

	for (l = slist; l; l = l->next)
		g_free (l->data);

	g_slist_free (slist);
	return NULL;
}

/* Used from g_hash_table_foreach_remove() to free the alarm UIDs hash table.
 * We do not need to do anything to individual elements since we were storing
 * the UID pointers inside the icalproperties themselves.
 */
static gboolean
free_alarm_cb (gpointer key, gpointer value, gpointer data)
{
	return TRUE;
}

/* Frees the internal icalcomponent only if it does not have a parent.  If it
 * does, it means we don't own it and we shouldn't free it.
 */
static void
free_icalcomponent (CalComponent *comp)
{
	CalComponentPrivate *priv;

	priv = comp->priv;

	if (!priv->icalcomp)
		return;

	/* Free the icalcomponent */

	if (icalcomponent_get_parent (priv->icalcomp) == NULL)
		icalcomponent_free (priv->icalcomp);

	priv->icalcomp = NULL;

	/* Free the mappings */

	priv->uid = NULL;

	priv->status = NULL;

	priv->categories = NULL;

	priv->classification = NULL;
	priv->comment_list = NULL;
	priv->completed = NULL;
	priv->contact_list = NULL;
	priv->created = NULL;

	priv->description_list = free_slist (priv->description_list);

	priv->dtend.prop = NULL;
	priv->dtend.tzid_param = NULL;

	priv->dtstamp = NULL;

	priv->dtstart.prop = NULL;
	priv->dtstart.tzid_param = NULL;

	priv->due.prop = NULL;
	priv->due.tzid_param = NULL;

	priv->exdate_list = free_slist (priv->exdate_list);

	g_slist_free (priv->exrule_list);
	priv->exrule_list = NULL;

	priv->geo = NULL;
	priv->last_modified = NULL;
	priv->percent = NULL;
	priv->priority = NULL;

	priv->rdate_list = free_slist (priv->rdate_list);

	g_slist_free (priv->rrule_list);
	priv->rrule_list = NULL;

	priv->sequence = NULL;

	priv->summary.prop = NULL;
	priv->summary.altrep_param = NULL;

	priv->transparency = NULL;
	priv->url = NULL;

	/* Free the subcomponents */

	g_hash_table_foreach_remove (priv->alarm_uid_hash, free_alarm_cb, NULL);

	/* Clean up */

	priv->need_sequence_inc = FALSE;
}

/* Destroy handler for the calendar component object */
static void
cal_component_destroy (GtkObject *object)
{
	CalComponent *comp;
	CalComponentPrivate *priv;

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

	comp = CAL_COMPONENT (object);
	priv = comp->priv;

	free_icalcomponent (comp);
	g_hash_table_destroy (priv->alarm_uid_hash);
	priv->alarm_uid_hash = NULL;

	g_free (priv);
	comp->priv = NULL;

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



/**
 * cal_component_gen_uid:
 *
 * Generates a unique identifier suitable for calendar components.
 *
 * Return value: A unique identifier string.  Every time this function is called
 * a different string is returned.
 **/
char *
cal_component_gen_uid (void)
{
        char *iso, *ret;
	static char *hostname;
	time_t t = time (NULL);
	static int serial;

	if (!hostname) {
		static char buffer [512];

		if ((gethostname (buffer, sizeof (buffer) - 1) == 0) &&
		    (buffer [0] != 0))
			hostname = buffer;
		else
			hostname = "localhost";
	}

	iso = isodate_from_time_t (t);
	ret = g_strdup_printf ("%s-%d-%d-%d-%d@%s",
			       iso,
			       getpid (),
			       getgid (),
			       getppid (),
			       serial++,
			       hostname);
	g_free (iso);

	return ret;
}

/**
 * cal_component_new:
 *
 * Creates a new empty calendar component object.  You should set it from an
 * #icalcomponent structure by using cal_component_set_icalcomponent() or with a
 * new empty component type by using cal_component_set_new_vtype().
 *
 * Return value: A newly-created calendar component object.
 **/
CalComponent *
cal_component_new (void)
{
	return CAL_COMPONENT (gtk_type_new (CAL_COMPONENT_TYPE));
}

/**
 * cal_component_clone:
 * @comp: A calendar component object.
 *
 * Creates a new calendar component object by copying the information from
 * another one.
 *
 * Return value: A newly-created calendar component with the same values as the
 * original one.
 **/
CalComponent *
cal_component_clone (CalComponent *comp)
{
	CalComponentPrivate *priv;
	CalComponent *new_comp;
	icalcomponent *new_icalcomp;

	g_return_val_if_fail (comp != NULL, NULL);
	g_return_val_if_fail (IS_CAL_COMPONENT (comp), NULL);

	priv = comp->priv;
	g_return_val_if_fail (priv->need_sequence_inc == FALSE, NULL);

	new_comp = cal_component_new ();

	if (priv->icalcomp) {
		new_icalcomp = icalcomponent_new_clone (priv->icalcomp);
		cal_component_set_icalcomponent (new_comp, new_icalcomp);
	}

	return new_comp;
}

/* Scans an attendee property */
static void
scan_attendee (CalComponent *comp, GSList **attendee_list, icalproperty *prop) 
{
	struct attendee *attendee;
	
	attendee = g_new (struct attendee, 1);
	attendee->prop = prop;

	attendee->cutype_param = icalproperty_get_first_parameter (prop, ICAL_CUTYPE_PARAMETER);
	attendee->member_param = icalproperty_get_first_parameter (prop, ICAL_MEMBER_PARAMETER);
	attendee->role_param = icalproperty_get_first_parameter (prop, ICAL_ROLE_PARAMETER);
	attendee->partstat_param = icalproperty_get_first_parameter (prop, ICAL_PARTSTAT_PARAMETER);
	attendee->rsvp_param = icalproperty_get_first_parameter (prop, ICAL_RSVP_PARAMETER);
	attendee->delto_param = icalproperty_get_first_parameter (prop, ICAL_DELEGATEDTO_PARAMETER);
	attendee->delfrom_param = icalproperty_get_first_parameter (prop, ICAL_DELEGATEDFROM_PARAMETER);
	attendee->sentby_param = icalproperty_get_first_parameter (prop, ICAL_SENTBY_PARAMETER);
	attendee->cn_param = icalproperty_get_first_parameter (prop, ICAL_CN_PARAMETER);
	attendee->language_param = icalproperty_get_first_parameter (prop, ICAL_LANGUAGE_PARAMETER);
	
	*attendee_list = g_slist_append (*attendee_list, attendee);
}

/* Scans a date/time and timezone pair property */
static void
scan_datetime (CalComponent *comp, struct datetime *datetime, icalproperty *prop)
{
	CalComponentPrivate *priv;

	priv = comp->priv;

	datetime->prop = prop;
	datetime->tzid_param = icalproperty_get_first_parameter (prop, ICAL_TZID_PARAMETER);
}

/* Scans an exception date property */
static void
scan_exdate (CalComponent *comp, icalproperty *prop)
{
	CalComponentPrivate *priv;
	struct datetime *dt;

	priv = comp->priv;

	dt = g_new (struct datetime, 1);
	dt->prop = prop;
	dt->tzid_param = icalproperty_get_first_parameter (prop, ICAL_TZID_PARAMETER);

	priv->exdate_list = g_slist_append (priv->exdate_list, dt);
}

/* Scans and attendee property */
static void
scan_organizer (CalComponent *comp, struct organizer *organizer, icalproperty *prop) 
{
	organizer->prop = prop;

	organizer->sentby_param = icalproperty_get_first_parameter (prop, ICAL_SENTBY_PARAMETER);
	organizer->cn_param = icalproperty_get_first_parameter (prop, ICAL_CN_PARAMETER);
	organizer->language_param = icalproperty_get_first_parameter (prop, ICAL_LANGUAGE_PARAMETER);
}

/* Scans an icalperiodtype property */
static void
scan_period (CalComponent *comp, GSList **list, icalproperty *prop)
{
	struct period *period;

	period = g_new (struct period, 1);
	period->prop = prop;
	period->value_param = icalproperty_get_first_parameter (prop, ICAL_VALUE_PARAMETER);

	*list = g_slist_append (*list, period);
}


/* Scans an icalrecurtype property */
static void
scan_recur_id (CalComponent *comp, struct recur_id *recur_id, icalproperty *prop)
{
	scan_datetime (comp, &recur_id->recur_time, prop);

	recur_id->range_param = icalproperty_get_first_parameter (prop, ICAL_RANGE_PARAMETER);
}

/* Scans an icalrecurtype property */
static void
scan_recur (CalComponent *comp, GSList **list, icalproperty *prop)
{
	*list = g_slist_append (*list, prop);
}

/* Scans the summary property */
static void
scan_summary (CalComponent *comp, icalproperty *prop)
{
	CalComponentPrivate *priv;

	priv = comp->priv;

	priv->summary.prop = prop;
	priv->summary.altrep_param = icalproperty_get_first_parameter (prop, ICAL_ALTREP_PARAMETER);
}

/* Scans a text (i.e. text + altrep) property */
static void
scan_text (CalComponent *comp, GSList **text_list, icalproperty *prop)
{
	struct text *text;

	text = g_new (struct text, 1);
	text->prop = prop;
	text->altrep_param = icalproperty_get_first_parameter (prop, ICAL_ALTREP_PARAMETER);

	*text_list = g_slist_append (*text_list, text);
}

/* Scans an icalproperty and adds its mapping to the component */
static void
scan_property (CalComponent *comp, icalproperty *prop)
{
	CalComponentPrivate *priv;
	icalproperty_kind kind;

	priv = comp->priv;

	kind = icalproperty_isa (prop);

	switch (kind) {
	case ICAL_STATUS_PROPERTY:
		priv->status = prop;
		break;

	case ICAL_ATTENDEE_PROPERTY:
		scan_attendee (comp, &priv->attendee_list, prop);
		break;

	case ICAL_CATEGORIES_PROPERTY:
		priv->categories = prop;
		break;

	case ICAL_CLASS_PROPERTY:
		priv->classification = prop;
		break;

	case ICAL_COMMENT_PROPERTY:
		scan_text (comp, &priv->comment_list, prop);
		break;

	case ICAL_COMPLETED_PROPERTY:
		priv->completed = prop;
		break;

	case ICAL_CONTACT_PROPERTY:
		scan_text (comp, &priv->contact_list, prop);
		break;

	case ICAL_CREATED_PROPERTY:
		priv->created = prop;
		break;

	case ICAL_DESCRIPTION_PROPERTY:
		scan_text (comp, &priv->description_list, prop);
		break;

	case ICAL_DTEND_PROPERTY:
		scan_datetime (comp, &priv->dtend, prop);
		break;

	case ICAL_DTSTAMP_PROPERTY:
		priv->dtstamp = prop;
		break;

	case ICAL_DTSTART_PROPERTY:
		scan_datetime (comp, &priv->dtstart, prop);
		break;

	case ICAL_DUE_PROPERTY:
		scan_datetime (comp, &priv->due, prop);
		break;

	case ICAL_EXDATE_PROPERTY:
		scan_exdate (comp, prop);
		break;

	case ICAL_EXRULE_PROPERTY:
		scan_recur (comp, &priv->exrule_list, prop);
		break;

	case ICAL_GEO_PROPERTY:
		priv->geo = prop;
		break;

	case ICAL_LASTMODIFIED_PROPERTY:
		priv->last_modified = prop;
		break;

	case ICAL_ORGANIZER_PROPERTY:
		scan_organizer (comp, &priv->organizer, prop);
		break;

	case ICAL_PERCENTCOMPLETE_PROPERTY:
		priv->percent = prop;
		break;

	case ICAL_PRIORITY_PROPERTY:
		priv->priority = prop;
		break;

	case ICAL_RECURRENCEID_PROPERTY:
		scan_recur_id (comp, &priv->recur_id, prop);
		break;

	case ICAL_RDATE_PROPERTY:
		scan_period (comp, &priv->rdate_list, prop);
		break;

	case ICAL_RRULE_PROPERTY:
		scan_recur (comp, &priv->rrule_list, prop);
		break;

	case ICAL_SEQUENCE_PROPERTY:
		priv->sequence = prop;
		break;

	case ICAL_SUMMARY_PROPERTY:
		scan_summary (comp, prop);
		break;

	case ICAL_TRANSP_PROPERTY:
		priv->transparency = prop;
		break;

	case ICAL_UID_PROPERTY:
		priv->uid = prop;
		break;

	case ICAL_URL_PROPERTY:
		priv->url = prop;
		break;

	default:
		break;
	}
}

/* Gets our alarm UID string from a property that is known to contain it */
static const char *
alarm_uid_from_prop (icalproperty *prop)
{
	const char *xstr;

	g_assert (icalproperty_isa (prop) == ICAL_X_PROPERTY);

	xstr = icalproperty_get_x (prop);
	g_assert (xstr != NULL);

	return xstr;
}

/* Sets our alarm UID extension property on an alarm component.  Returns a
 * pointer to the UID string inside the property itself.
 */
static const char *
set_alarm_uid (icalcomponent *alarm, const char *auid)
{
	icalproperty *prop;
	const char *inprop_auid;

	/* Create the new property */

	prop = icalproperty_new_x ((char *) auid);
	icalproperty_set_x_name (prop, EVOLUTION_ALARM_UID_PROPERTY);

	icalcomponent_add_property (alarm, prop);

	inprop_auid = alarm_uid_from_prop (prop);
	return inprop_auid;
}

/* Removes any alarm UID extension properties from an alarm subcomponent */
static void
remove_alarm_uid (icalcomponent *alarm)
{
	icalproperty *prop;
	GSList *list, *l;

	list = NULL;

	for (prop = icalcomponent_get_first_property (alarm, ICAL_X_PROPERTY);
	     prop;
	     prop = icalcomponent_get_next_property (alarm, ICAL_X_PROPERTY)) {
		const char *xname;

		xname = icalproperty_get_x_name (prop);
		g_assert (xname != NULL);

		if (strcmp (xname, EVOLUTION_ALARM_UID_PROPERTY) == 0)
			list = g_slist_prepend (list, prop);
	}

	for (l = list; l; l = l->next) {
		prop = l->data;
		icalcomponent_remove_property (alarm, prop);
		icalproperty_free (prop);
	}

	g_slist_free (list);
}

/* Adds an alarm subcomponent to the calendar component's mapping table.  The
 * actual UID with which it gets added may not be the same as the specified one;
 * this function will change it if the table already had an alarm subcomponent
 * with the specified UID.  Returns the actual UID used.
 */
static const char *
add_alarm (CalComponent *comp, icalcomponent *alarm, const char *auid)
{
	CalComponentPrivate *priv;
	icalcomponent *old_alarm;

	priv = comp->priv;

	/* First we see if we already have an alarm with the requested UID.  In
	 * that case, we need to change the new UID to something else.  This
	 * should never happen, but who knows.
	 */

	old_alarm = g_hash_table_lookup (priv->alarm_uid_hash, auid);
	if (old_alarm != NULL) {
		char *new_auid;

		g_message ("add_alarm(): Got alarm with duplicated UID `%s', changing it...", auid);

		remove_alarm_uid (alarm);

		new_auid = cal_component_gen_uid ();
		auid = set_alarm_uid (alarm, new_auid);
		g_free (new_auid);
	}

	g_hash_table_insert (priv->alarm_uid_hash, (char *) auid, alarm);
	return auid;
}

/* Scans an alarm subcomponent, adds an UID extension property to it (so that we
 * can reference alarms by unique IDs), and adds its mapping to the component.  */
static void
scan_alarm (CalComponent *comp, icalcomponent *alarm)
{
	CalComponentPrivate *priv;
	icalproperty *prop;
	const char *auid;
	char *new_auid;

	priv = comp->priv;

	for (prop = icalcomponent_get_first_property (alarm, ICAL_X_PROPERTY);
	     prop;
	     prop = icalcomponent_get_next_property (alarm, ICAL_X_PROPERTY)) {
		const char *xname;

		xname = icalproperty_get_x_name (prop);
		g_assert (xname != NULL);

		if (strcmp (xname, EVOLUTION_ALARM_UID_PROPERTY) == 0) {
			auid = alarm_uid_from_prop (prop);
			add_alarm (comp, alarm, auid);
			return;
		}
	}

	/* The component has no alarm UID property, so we create one. */

	new_auid = cal_component_gen_uid ();
	auid = set_alarm_uid (alarm, new_auid);
	g_free (new_auid);

	add_alarm (comp, alarm, auid);
}

/* Scans an icalcomponent for its properties so that we can provide
 * random-access to them.  It also builds a hash table of the component's alarm
 * subcomponents.
 */
static void
scan_icalcomponent (CalComponent *comp)
{
	CalComponentPrivate *priv;
	icalproperty *prop;
	icalcompiter iter;

	priv = comp->priv;

	g_assert (priv->icalcomp != NULL);

	/* Scan properties */

	for (prop = icalcomponent_get_first_property (priv->icalcomp, ICAL_ANY_PROPERTY);
	     prop;
	     prop = icalcomponent_get_next_property (priv->icalcomp, ICAL_ANY_PROPERTY))
		scan_property (comp, prop);

	/* Scan subcomponents */

	for (iter = icalcomponent_begin_component (priv->icalcomp, ICAL_VALARM_COMPONENT);
	     icalcompiter_deref (&iter) != NULL;
	     icalcompiter_next (&iter)) {
		icalcomponent *subcomp;

		subcomp = icalcompiter_deref (&iter);
		scan_alarm (comp, subcomp);
	}
}

/* Ensures that the mandatory calendar component properties (uid, dtstamp) do
 * exist.  If they don't exist, it creates them automatically.
 */
static void
ensure_mandatory_properties (CalComponent *comp)
{
	CalComponentPrivate *priv;

	priv = comp->priv;
	g_assert (priv->icalcomp != NULL);

	if (!priv->uid) {
		char *uid;

		uid = cal_component_gen_uid ();
		priv->uid = icalproperty_new_uid (uid);
		g_free (uid);

		icalcomponent_add_property (priv->icalcomp, priv->uid);
	}

	if (!priv->dtstamp) {
		time_t tim;
		struct icaltimetype t;

		tim = time (NULL);
		t = icaltime_from_timet_with_zone (tim, FALSE, icaltimezone_get_utc_timezone ());

		priv->dtstamp = icalproperty_new_dtstamp (t);
		icalcomponent_add_property (priv->icalcomp, priv->dtstamp);
	}
}

/**
 * cal_component_set_new_vtype:
 * @comp: A calendar component object.
 * @type: Type of calendar component to create.
 *
 * Clears any existing component data from a calendar component object and
 * creates a new #icalcomponent of the specified type for it.  The only property
 * that will be set in the new component will be its unique identifier.
 **/
void
cal_component_set_new_vtype (CalComponent *comp, CalComponentVType type)
{
	CalComponentPrivate *priv;
	icalcomponent *icalcomp;
	icalcomponent_kind kind;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;

	free_icalcomponent (comp);

	if (type == CAL_COMPONENT_NO_TYPE)
		return;

	/* Figure out the kind and create the icalcomponent */

	switch (type) {
	case CAL_COMPONENT_EVENT:
		kind = ICAL_VEVENT_COMPONENT;
		break;

	case CAL_COMPONENT_TODO:
		kind = ICAL_VTODO_COMPONENT;
		break;

	case CAL_COMPONENT_JOURNAL:
		kind = ICAL_VJOURNAL_COMPONENT;
		break;

	case CAL_COMPONENT_FREEBUSY:
		kind = ICAL_VFREEBUSY_COMPONENT;
		break;

	case CAL_COMPONENT_TIMEZONE:
		kind = ICAL_VTIMEZONE_COMPONENT;
		break;

	default:
		g_assert_not_reached ();
		kind = ICAL_NO_COMPONENT;
	}

	icalcomp = icalcomponent_new (kind);
	if (!icalcomp) {
		g_message ("cal_component_set_new_vtype(): Could not create the icalcomponent!");
		return;
	}

	/* Scan the component to build our mapping table */

	priv->icalcomp = icalcomp;
	scan_icalcomponent (comp);

	/* Add missing stuff */

	ensure_mandatory_properties (comp);
}

/**
 * cal_component_set_icalcomponent:
 * @comp: A calendar component object.
 * @icalcomp: An #icalcomponent.
 *
 * Sets the contents of a calendar component object from an #icalcomponent
 * structure.  If the @comp already had an #icalcomponent set into it, it will
 * will be freed automatically if the #icalcomponent does not have a parent
 * component itself.
 *
 * Supported component types are VEVENT, VTODO, VJOURNAL, VFREEBUSY, and VTIMEZONE.
 *
 * Return value: TRUE on success, FALSE if @icalcomp is an unsupported component
 * type.
 **/
gboolean
cal_component_set_icalcomponent (CalComponent *comp, icalcomponent *icalcomp)
{
	CalComponentPrivate *priv;
	icalcomponent_kind kind;

	g_return_val_if_fail (comp != NULL, FALSE);
	g_return_val_if_fail (IS_CAL_COMPONENT (comp), FALSE);

	priv = comp->priv;

	if (priv->icalcomp == icalcomp)
		return TRUE;

	free_icalcomponent (comp);

	if (!icalcomp) {
		priv->icalcomp = NULL;
		return TRUE;
	}

	kind = icalcomponent_isa (icalcomp);

	if (!(kind == ICAL_VEVENT_COMPONENT
	      || kind == ICAL_VTODO_COMPONENT
	      || kind == ICAL_VJOURNAL_COMPONENT
	      || kind == ICAL_VFREEBUSY_COMPONENT
	      || kind == ICAL_VTIMEZONE_COMPONENT))
		return FALSE;

	priv->icalcomp = icalcomp;

	scan_icalcomponent (comp);
	ensure_mandatory_properties (comp);

	return TRUE;
}

/**
 * cal_component_get_icalcomponent:
 * @comp: A calendar component object.
 *
 * Queries the #icalcomponent structure that a calendar component object is
 * wrapping.
 *
 * Return value: An #icalcomponent structure, or NULL if the @comp has no
 * #icalcomponent set to it.
 **/
icalcomponent *
cal_component_get_icalcomponent (CalComponent *comp)
{
	CalComponentPrivate *priv;

	g_return_val_if_fail (comp != NULL, NULL);
	g_return_val_if_fail (IS_CAL_COMPONENT (comp), NULL);

	priv = comp->priv;
	g_return_val_if_fail (priv->need_sequence_inc == FALSE, NULL);

	return priv->icalcomp;
}

/**
 * cal_component_get_vtype:
 * @comp: A calendar component object.
 *
 * Queries the type of a calendar component object.
 *
 * Return value: The type of the component, as defined by RFC 2445.
 **/
CalComponentVType
cal_component_get_vtype (CalComponent *comp)
{
	CalComponentPrivate *priv;
	icalcomponent_kind kind;

	g_return_val_if_fail (comp != NULL, CAL_COMPONENT_NO_TYPE);
	g_return_val_if_fail (IS_CAL_COMPONENT (comp), CAL_COMPONENT_NO_TYPE);

	priv = comp->priv;
	g_return_val_if_fail (priv->icalcomp != NULL, CAL_COMPONENT_NO_TYPE);

	kind = icalcomponent_isa (priv->icalcomp);
	switch (kind) {
	case ICAL_VEVENT_COMPONENT:
		return CAL_COMPONENT_EVENT;

	case ICAL_VTODO_COMPONENT:
		return CAL_COMPONENT_TODO;

	case ICAL_VJOURNAL_COMPONENT:
		return CAL_COMPONENT_JOURNAL;

	case ICAL_VFREEBUSY_COMPONENT:
		return CAL_COMPONENT_FREEBUSY;

	case ICAL_VTIMEZONE_COMPONENT:
		return CAL_COMPONENT_TIMEZONE;

	default:
		/* We should have been loaded with a supported type! */
		g_assert_not_reached ();
		return CAL_COMPONENT_NO_TYPE;
	}
}

/**
 * cal_component_get_as_string:
 * @comp: A calendar component.
 *
 * Gets the iCalendar string representation of a calendar component.  You should
 * call cal_component_commit_sequence() before this function to ensure that the
 * component's sequence number is consistent with the state of the object.
 *
 * Return value: String representation of the calendar component according to
 * RFC 2445.
 **/
char *
cal_component_get_as_string (CalComponent *comp)
{
	CalComponentPrivate *priv;
	char *str, *buf;

	g_return_val_if_fail (comp != NULL, NULL);
	g_return_val_if_fail (IS_CAL_COMPONENT (comp), NULL);

	priv = comp->priv;
	g_return_val_if_fail (priv->icalcomp != NULL, NULL);

	/* Ensure that the user has committed the new SEQUENCE */
	g_return_val_if_fail (priv->need_sequence_inc == FALSE, NULL);

	/* We dup the string; libical owns that memory */

	str = icalcomponent_as_ical_string (priv->icalcomp);

	if (str)
		buf = g_strdup (str);
	else
		buf = NULL;

	return buf;
}

/**
 * cal_component_commit_sequence:
 * @comp:
 *
 * Increments the sequence number property in a calendar component object if it
 * needs it.  This needs to be done when any of a number of properties listed in
 * RFC 2445 change values, such as the start and end dates of a component.
 *
 * This function must be called before calling cal_component_get_as_string() to
 * ensure that the component is fully consistent.
 **/
void
cal_component_commit_sequence (CalComponent *comp)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (!priv->need_sequence_inc)
		return;

	if (priv->sequence) {
		int seq;

		seq = icalproperty_get_sequence (priv->sequence);
		icalproperty_set_sequence (priv->sequence, seq + 1);
	} else {
		/* The component had no SEQUENCE property, so assume that the
		 * default would have been zero.  Since it needed incrementing
		 * anyways, we use a value of 1 here.
		 */
		priv->sequence = icalproperty_new_sequence (1);
		icalcomponent_add_property (priv->icalcomp, priv->sequence);
	}

	priv->need_sequence_inc = FALSE;
}

/**
 * cal_component_get_uid:
 * @comp: A calendar component object.
 * @uid: Return value for the UID string.
 *
 * Queries the unique identifier of a calendar component object.
 **/
void
cal_component_get_uid (CalComponent *comp, const char **uid)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (uid != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	/* This MUST exist, since we ensured that it did */
	g_assert (priv->uid != NULL);

	*uid = icalproperty_get_uid (priv->uid);
}

/**
 * cal_component_set_uid:
 * @comp: A calendar component object.
 * @uid: Unique identifier.
 *
 * Sets the unique identifier string of a calendar component object.
 **/
void
cal_component_set_uid (CalComponent *comp, const char *uid)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (uid != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	/* This MUST exist, since we ensured that it did */
	g_assert (priv->uid != NULL);

	icalproperty_set_uid (priv->uid, (char *) uid);
}

/**
 * cal_component_get_categories:
 * @comp: A calendar component object.
 * @categories:
 *
 *
 **/
void
cal_component_get_categories (CalComponent *comp, const char **categories)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (categories != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (priv->categories)
		*categories = icalproperty_get_categories (priv->categories);
	else
		*categories = NULL;
}

/**
 * cal_component_set_categories:
 * @comp: A calendar component object.
 * @categories:
 *
 *
 **/
void
cal_component_set_categories (CalComponent *comp, const char *categories)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (!categories || !(*categories)) {
		if (priv->categories) {
			icalcomponent_remove_property (priv->icalcomp, priv->categories);
			icalproperty_free (priv->categories);
			priv->url = NULL;
		}

		return;
	}

	if (priv->categories)
		icalproperty_set_categories (priv->categories, (char *) categories);
	else {
		priv->categories = icalproperty_new_categories ((char *) categories);
		icalcomponent_add_property (priv->icalcomp, priv->categories);
	}
}


/**
 * cal_component_get_categories_list:
 * @comp: A calendar component object.
 * @categ_list: Return value for the list of strings, where each string is a
 * category.  This should be freed using cal_component_free_categories_list().
 *
 * Queries the list of categories of a calendar component object.  Each element
 * in the returned categ_list is a string with the corresponding category.
 **/
void
cal_component_get_categories_list (CalComponent *comp, GSList **categ_list)
{
	CalComponentPrivate *priv;
	const char *categories;
	const char *p;
	const char *cat_start;
	char *str;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (categ_list != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (!priv->categories) {
		*categ_list = NULL;
		return;
	}

	categories = icalproperty_get_categories (priv->categories);
	g_assert (categories != NULL);

	cat_start = categories;
	*categ_list = NULL;

	for (p = categories; *p; p++)
		if (*p == ',') {
			str = g_strndup (cat_start, p - cat_start);
			*categ_list = g_slist_prepend (*categ_list, str);

			cat_start = p + 1;
		}

	str = g_strndup (cat_start, p - cat_start);
	*categ_list = g_slist_prepend (*categ_list, str);

	*categ_list = g_slist_reverse (*categ_list);
}

/* Creates a comma-delimited string of categories */
static char *
stringify_categories (GSList *categ_list)
{
	GString *s;
	GSList *l;
	char *str;

	s = g_string_new (NULL);

	for (l = categ_list; l; l = l->next) {
		g_string_append (s, l->data);

		if (l->next != NULL)
			g_string_append (s, ",");
	}

	str = s->str;
	g_string_free (s, FALSE);

	return str;
}

/**
 * cal_component_set_categories_list:
 * @comp: A calendar component object.
 * @categ_list: List of strings, one for each category.
 *
 * Sets the list of categories of a calendar component object.
 **/
void
cal_component_set_categories_list (CalComponent *comp, GSList *categ_list)
{
	CalComponentPrivate *priv;
	char *categories_str;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (!categ_list) {
		if (priv->categories) {
			icalcomponent_remove_property (priv->icalcomp, priv->categories);
			icalproperty_free (priv->categories);
		}

		return;
	}

	/* Create a single string of categories */
	categories_str = stringify_categories (categ_list);

	/* Set the categories */
	priv->categories = icalproperty_new_categories (categories_str);
	g_free (categories_str);

	icalcomponent_add_property (priv->icalcomp, priv->categories);
}

/**
 * cal_component_get_classification:
 * @comp: A calendar component object.
 * @classif: Return value for the classification.
 *
 * Queries the classification of a calendar component object.  If the
 * classification property is not set on this component, this function returns
 * #CAL_COMPONENT_CLASS_NONE.
 **/
void
cal_component_get_classification (CalComponent *comp, CalComponentClassification *classif)
{
	CalComponentPrivate *priv;
	const char *class;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (classif != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (!priv->classification) {
		*classif = CAL_COMPONENT_CLASS_NONE;
		return;
	}

	class = icalproperty_get_class (priv->classification);

	if (strcasecmp (class, "PUBLIC") == 0)
		*classif = CAL_COMPONENT_CLASS_PUBLIC;
	else if (strcasecmp (class, "PRIVATE") == 0)
		*classif = CAL_COMPONENT_CLASS_PRIVATE;
	else if (strcasecmp (class, "CONFIDENTIAL") == 0)
		*classif = CAL_COMPONENT_CLASS_CONFIDENTIAL;
	else
		*classif = CAL_COMPONENT_CLASS_UNKNOWN;
}

/**
 * cal_component_set_classification:
 * @comp: A calendar component object.
 * @classif: Classification to use.
 *
 * Sets the classification property of a calendar component object.  To unset
 * the property, specify CAL_COMPONENT_CLASS_NONE for @classif.
 **/
void
cal_component_set_classification (CalComponent *comp, CalComponentClassification classif)
{
	CalComponentPrivate *priv;
	char *str;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (classif != CAL_COMPONENT_CLASS_UNKNOWN);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (classif == CAL_COMPONENT_CLASS_NONE) {
		if (priv->classification) {
			icalcomponent_remove_property (priv->icalcomp, priv->classification);
			icalproperty_free (priv->classification);
			priv->classification = NULL;
		}

		return;
	}

	switch (classif) {
	case CAL_COMPONENT_CLASS_PUBLIC:
		str = "PUBLIC";
		break;

	case CAL_COMPONENT_CLASS_PRIVATE:
		str = "PRIVATE";
		break;

	case CAL_COMPONENT_CLASS_CONFIDENTIAL:
		str = "CONFIDENTIAL";
		break;

	default:
		g_assert_not_reached ();
		str = NULL;
	}

	if (priv->classification)
		icalproperty_set_class (priv->classification, str);
	else {
		priv->classification = icalproperty_new_class (str);
		icalcomponent_add_property (priv->icalcomp, priv->classification);
	}
}

/* Gets a text list value */
static void
get_text_list (GSList *text_list,
	       const char *(* get_prop_func) (icalproperty *prop),
	       GSList **tl)
{
	GSList *l;

	*tl = NULL;

	if (!text_list)
		return;

	for (l = text_list; l; l = l->next) {
		struct text *text;
		CalComponentText *t;

		text = l->data;
		g_assert (text->prop != NULL);

		t = g_new (CalComponentText, 1);
		t->value = (* get_prop_func) (text->prop);

		if (text->altrep_param)
			t->altrep = icalparameter_get_altrep (text->altrep_param);
		else
			t->altrep = NULL;

		*tl = g_slist_prepend (*tl, t);
	}

	*tl = g_slist_reverse (*tl);
}

/* Sets a text list value */
static void
set_text_list (CalComponent *comp,
	       icalproperty *(* new_prop_func) (const char *value),
	       GSList **text_list,
	       GSList *tl)
{
	CalComponentPrivate *priv;
	GSList *l;

	priv = comp->priv;

	/* Remove old texts */

	for (l = *text_list; l; l = l->next) {
		struct text *text;

		text = l->data;
		g_assert (text->prop != NULL);

		icalcomponent_remove_property (priv->icalcomp, text->prop);
		icalproperty_free (text->prop);
		g_free (text);
	}

	g_slist_free (*text_list);
	*text_list = NULL;

	/* Add in new texts */

	for (l = tl; l; l = l->next) {
		CalComponentText *t;
		struct text *text;

		t = l->data;
		g_return_if_fail (t->value != NULL);

		text = g_new (struct text, 1);

		text->prop = (* new_prop_func) ((char *) t->value);
		icalcomponent_add_property (priv->icalcomp, text->prop);

		if (t->altrep) {
			text->altrep_param = icalparameter_new_altrep ((char *) t->altrep);
			icalproperty_add_parameter (text->prop, text->altrep_param);
		} else
			text->altrep_param = NULL;

		*text_list = g_slist_prepend (*text_list, text);
	}

	*text_list = g_slist_reverse (*text_list);
}

/**
 * cal_component_get_comment_list:
 * @comp: A calendar component object.
 * @text_list: Return value for the comment properties and their parameters, as
 * a list of #CalComponentText structures.  This should be freed using the
 * cal_component_free_text_list() function.
 *
 * Queries the comment of a calendar component object.  The comment property can
 * appear several times inside a calendar component, and so a list of
 * #CalComponentText is returned.
 **/
void
cal_component_get_comment_list (CalComponent *comp, GSList **text_list)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (text_list != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	get_text_list (priv->comment_list, icalproperty_get_comment, text_list);
}

/**
 * cal_component_set_comment_list:
 * @comp: A calendar component object.
 * @text_list: List of #CalComponentText structures.
 *
 * Sets the comment of a calendar component object.  The comment property can
 * appear several times inside a calendar component, and so a list of
 * #CalComponentText structures is used.
 **/
void
cal_component_set_comment_list (CalComponent *comp, GSList *text_list)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	set_text_list (comp, icalproperty_new_comment, &priv->comment_list, text_list);
}

/**
 * cal_component_get_contact_list:
 * @comp: A calendar component object.
 * @text_list: Return value for the contact properties and their parameters, as
 * a list of #CalComponentText structures.  This should be freed using the
 * cal_component_free_text_list() function.
 *
 * Queries the contact of a calendar component object.  The contact property can
 * appear several times inside a calendar component, and so a list of
 * #CalComponentText is returned.
 **/
void
cal_component_get_contact_list (CalComponent *comp, GSList **text_list)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (text_list != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	get_text_list (priv->contact_list, icalproperty_get_contact, text_list);
}

/**
 * cal_component_set_contact_list:
 * @comp: A calendar component object.
 * @text_list: List of #CalComponentText structures.
 *
 * Sets the contact of a calendar component object.  The contact property can
 * appear several times inside a calendar component, and so a list of
 * #CalComponentText structures is used.
 **/
void
cal_component_set_contact_list (CalComponent *comp, GSList *text_list)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	set_text_list (comp, icalproperty_new_contact, &priv->contact_list, text_list);
}

/* Gets a struct icaltimetype value */
static void
get_icaltimetype (icalproperty *prop,
		  struct icaltimetype (* get_prop_func) (icalproperty *prop),
		  struct icaltimetype **t)
{
	if (!prop) {
		*t = NULL;
		return;
	}

	*t = g_new (struct icaltimetype, 1);
	**t = (* get_prop_func) (prop);
}

/* Sets a struct icaltimetype value */
static void
set_icaltimetype (CalComponent *comp, icalproperty **prop,
		  icalproperty *(* prop_new_func) (struct icaltimetype v),
		  void (* prop_set_func) (icalproperty *prop, struct icaltimetype v),
		  struct icaltimetype *t)
{
	CalComponentPrivate *priv;

	priv = comp->priv;

	if (!t) {
		if (*prop) {
			icalcomponent_remove_property (priv->icalcomp, *prop);
			icalproperty_free (*prop);
			*prop = NULL;
		}

		return;
	}

	if (*prop)
		(* prop_set_func) (*prop, *t);
	else {
		*prop = (* prop_new_func) (*t);
		icalcomponent_add_property (priv->icalcomp, *prop);
	}
}

/**
 * cal_component_get_completed:
 * @comp: A calendar component object.
 * @t: Return value for the completion date.  This should be freed using the
 * cal_component_free_icaltimetype() function.
 *
 * Queries the date at which a calendar compoment object was completed.
 **/
void
cal_component_get_completed (CalComponent *comp, struct icaltimetype **t)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (t != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	get_icaltimetype (priv->completed, icalproperty_get_completed, t);
}

/**
 * cal_component_set_completed:
 * @comp: A calendar component object.
 * @t: Value for the completion date.
 *
 * Sets the date at which a calendar component object was completed.
 **/
void
cal_component_set_completed (CalComponent *comp, struct icaltimetype *t)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	set_icaltimetype (comp, &priv->completed,
			  icalproperty_new_completed,
			  icalproperty_set_completed,
			  t);
}


/**
 * cal_component_get_created:
 * @comp: A calendar component object.
 * @t: Return value for the creation date.  This should be freed using the
 * cal_component_free_icaltimetype() function.
 *
 * Queries the date in which a calendar component object was created in the
 * calendar store.
 **/
void
cal_component_get_created (CalComponent *comp, struct icaltimetype **t)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (t != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	get_icaltimetype (priv->created, icalproperty_get_created, t);
}

/**
 * cal_component_set_created:
 * @comp: A calendar component object.
 * @t: Value for the creation date.
 *
 * Sets the date in which a calendar component object is created in the calendar
 * store.  This should only be used inside a calendar store application, i.e.
 * not by calendar user agents.
 **/
void
cal_component_set_created (CalComponent *comp, struct icaltimetype *t)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	set_icaltimetype (comp, &priv->created,
			  icalproperty_new_created,
			  icalproperty_set_created,
			  t);
}

/**
 * cal_component_get_description_list:
 * @comp: A calendar component object.
 * @text_list: Return value for the description properties and their parameters,
 * as a list of #CalComponentText structures.  This should be freed using the
 * cal_component_free_text_list() function.
 *
 * Queries the description of a calendar component object.  Journal components
 * may have more than one description, and as such this function returns a list
 * of #CalComponentText structures.  All other types of components can have at
 * most one description.
 **/
void
cal_component_get_description_list (CalComponent *comp, GSList **text_list)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (text_list != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	get_text_list (priv->description_list, icalproperty_get_description, text_list);
}

/**
 * cal_component_set_description_list:
 * @comp: A calendar component object.
 * @text_list: List of #CalComponentSummary structures.
 *
 * Sets the description of a calendar component object.  Journal components may
 * have more than one description, and as such this function takes in a list of
 * #CalComponentDescription structures.  All other types of components can have
 * at most one description.
 **/
void
cal_component_set_description_list (CalComponent *comp, GSList *text_list)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	set_text_list (comp, icalproperty_new_description, &priv->description_list, text_list);
}

/* Gets a date/time and timezone pair */
static void
get_datetime (struct datetime *datetime,
	      struct icaltimetype (* get_prop_func) (icalproperty *prop),
	      CalComponentDateTime *dt)
{
	if (datetime->prop) {
		dt->value = g_new (struct icaltimetype, 1);
		*dt->value = (* get_prop_func) (datetime->prop);
	} else
		dt->value = NULL;

	/* If the icaltimetype has is_utc set, we set "UTC" as the TZID.
	   This makes the timezone code simpler. */
	if (datetime->tzid_param)
		dt->tzid = g_strdup (icalparameter_get_tzid (datetime->tzid_param));
	else if (dt->value && dt->value->is_utc)
		dt->tzid = g_strdup ("UTC");
	else
		dt->tzid = NULL;
}

/* Sets a date/time and timezone pair */
static void
set_datetime (CalComponent *comp, struct datetime *datetime,
	      icalproperty *(* prop_new_func) (struct icaltimetype v),
	      void (* prop_set_func) (icalproperty * prop, struct icaltimetype v),
	      CalComponentDateTime *dt)
{
	CalComponentPrivate *priv;

	priv = comp->priv;

	if (!dt) {
		if (datetime->prop) {
			icalcomponent_remove_property (priv->icalcomp, datetime->prop);
			icalproperty_free (datetime->prop);

			datetime->prop = NULL;
			datetime->tzid_param = NULL;
		}

		return;
	}

	g_return_if_fail (dt->value != NULL);

	/* If the TZID is set to "UTC", we set the is_utc flag. */
	if (dt->tzid && !strcmp (dt->tzid, "UTC"))
		dt->value->is_utc = 1;

	if (datetime->prop)
		(* prop_set_func) (datetime->prop, *dt->value);
	else {
		datetime->prop = (* prop_new_func) (*dt->value);
		icalcomponent_add_property (priv->icalcomp, datetime->prop);
	}

	/* If the TZID is set to "UTC", we don't want to save the TZID. */
	if (dt->tzid && strcmp (dt->tzid, "UTC")) {
		g_assert (datetime->prop != NULL);

		if (datetime->tzid_param)
			icalparameter_set_tzid (datetime->tzid_param, (char *) dt->tzid);
		else {
			datetime->tzid_param = icalparameter_new_tzid ((char *) dt->tzid);
			icalproperty_add_parameter (datetime->prop, datetime->tzid_param);
		}
	} else if (datetime->tzid_param) {
		icalproperty_remove_parameter (datetime->prop, ICAL_TZID_PARAMETER);
		icalparameter_free (datetime->tzid_param);
		datetime->tzid_param = NULL;
	}
}

/**
 * cal_component_get_dtend:
 * @comp: A calendar component object.
 * @dt: Return value for the date/time end.  This should be freed with the
 * cal_component_free_datetime() function.
 *
 * Queries the date/time end of a calendar component object.
 **/
void
cal_component_get_dtend (CalComponent *comp, CalComponentDateTime *dt)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (dt != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	get_datetime (&priv->dtend, icalproperty_get_dtend, dt);
}

/**
 * cal_component_set_dtend:
 * @comp: A calendar component object.
 * @dt: End date/time.
 *
 * Sets the date/time end property of a calendar component object.
 **/
void
cal_component_set_dtend (CalComponent *comp, CalComponentDateTime *dt)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	set_datetime (comp, &priv->dtend,
		      icalproperty_new_dtend,
		      icalproperty_set_dtend,
		      dt);

	priv->need_sequence_inc = TRUE;
}

/**
 * cal_component_get_dtstamp:
 * @comp: A calendar component object.
 * @t: A value for the date/timestamp.
 *
 * Queries the date/timestamp property of a calendar component object, which is
 * the last time at which the object was modified by a calendar user agent.
 **/
void
cal_component_get_dtstamp (CalComponent *comp, struct icaltimetype *t)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (t != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	/* This MUST exist, since we ensured that it did */
	g_assert (priv->dtstamp != NULL);

	*t = icalproperty_get_dtstamp (priv->dtstamp);
}

/**
 * cal_component_set_dtstamp:
 * @comp: A calendar component object.
 * @t: Date/timestamp value.
 *
 * Sets the date/timestamp of a calendar component object.  This should be
 * called whenever a calendar user agent makes a change to a component's
 * properties.
 **/
void
cal_component_set_dtstamp (CalComponent *comp, struct icaltimetype *t)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (t != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	/* This MUST exist, since we ensured that it did */
	g_assert (priv->dtstamp != NULL);

	icalproperty_set_dtstamp (priv->dtstamp, *t);
}

/**
 * cal_component_get_dtstart:
 * @comp: A calendar component object.
 * @dt: Return value for the date/time start.  This should be freed with the
 * cal_component_free_datetime() function.
 *
 * Queries the date/time start of a calendar component object.
 **/
void
cal_component_get_dtstart (CalComponent *comp, CalComponentDateTime *dt)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (dt != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	get_datetime (&priv->dtstart, icalproperty_get_dtstart, dt);
}

/**
 * cal_component_set_dtstart:
 * @comp: A calendar component object.
 * @dt: Start date/time.
 *
 * Sets the date/time start property of a calendar component object.
 **/
void
cal_component_set_dtstart (CalComponent *comp, CalComponentDateTime *dt)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	set_datetime (comp, &priv->dtstart,
		      icalproperty_new_dtstart,
		      icalproperty_set_dtstart,
		      dt);

	priv->need_sequence_inc = TRUE;
}

/**
 * cal_component_get_due:
 * @comp: A calendar component object.
 * @dt: Return value for the due date/time.  This should be freed with the
 * cal_component_free_datetime() function.
 *
 * Queries the due date/time of a calendar component object.
 **/
void
cal_component_get_due (CalComponent *comp, CalComponentDateTime *dt)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (dt != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	get_datetime (&priv->due, icalproperty_get_due, dt);
}

/**
 * cal_component_set_due:
 * @comp: A calendar component object.
 * @dt: End date/time.
 *
 * Sets the due date/time property of a calendar component object.
 **/
void
cal_component_set_due (CalComponent *comp, CalComponentDateTime *dt)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	set_datetime (comp, &priv->due,
		      icalproperty_new_due,
		      icalproperty_set_due,
		      dt);

	priv->need_sequence_inc = TRUE;
}

/* Builds a list of CalComponentPeriod structures based on a list of icalproperties */
static void
get_period_list (GSList *period_list,
		 struct icaldatetimeperiodtype (* get_prop_func) (icalproperty *prop),
		 GSList **list)
{
	GSList *l;

	*list = NULL;

	if (!period_list)
		return;

	for (l = period_list; l; l = l->next) {
		struct period *period;
		CalComponentPeriod *p;
		struct icaldatetimeperiodtype ip;

		period = l->data;
		g_assert (period->prop != NULL);

		p = g_new (CalComponentPeriod, 1);

		/* Get value parameter */

		if (period->value_param) {
			icalparameter_value value_type;

			value_type = icalparameter_get_value (period->value_param);

			if (value_type == ICAL_VALUE_DATE || value_type == ICAL_VALUE_DATETIME)
				p->type = CAL_COMPONENT_PERIOD_DATETIME;
			else if (value_type == ICAL_VALUE_DURATION)
				p->type = CAL_COMPONENT_PERIOD_DURATION;
			else {
				g_message ("get_period_list(): Unknown value for period %d; "
					   "using DATETIME", value_type);
				p->type = CAL_COMPONENT_PERIOD_DATETIME;
			}
		} else
			p->type = CAL_COMPONENT_PERIOD_DATETIME;

		/* Get start and end/duration */

		ip = (* get_prop_func) (period->prop);

		p->start = ip.period.start;

		if (p->type == CAL_COMPONENT_PERIOD_DATETIME)
			p->u.end = ip.period.end;
		else if (p->type == CAL_COMPONENT_PERIOD_DURATION)
			p->u.duration = ip.period.duration;
		else
			g_assert_not_reached ();

		/* Put in list */

		*list = g_slist_prepend (*list, p);
	}

	*list = g_slist_reverse (*list);
}

/* Sets a period list value */
static void
set_period_list (CalComponent *comp,
		 icalproperty *(* new_prop_func) (struct icaldatetimeperiodtype period),
		 GSList **period_list,
		 GSList *pl)
{
	CalComponentPrivate *priv;
	GSList *l;

	priv = comp->priv;

	/* Remove old periods */

	for (l = *period_list; l; l = l->next) {
		struct period *period;

		period = l->data;
		g_assert (period->prop != NULL);

		icalcomponent_remove_property (priv->icalcomp, period->prop);
		icalproperty_free (period->prop);
		g_free (period);
	}

	g_slist_free (*period_list);
	*period_list = NULL;

	/* Add in new periods */

	for (l = pl; l; l = l->next) {
		CalComponentPeriod *p;
		struct period *period;
		struct icaldatetimeperiodtype ip;
		icalparameter_value value_type;

		g_assert (l->data != NULL);
		p = l->data;

		/* Create libical value */

		ip.period.start = p->start;

		if (p->type == CAL_COMPONENT_PERIOD_DATETIME) {
			value_type = ICAL_VALUE_DATETIME;
			ip.period.end = p->u.end;
		} else if (p->type == CAL_COMPONENT_PERIOD_DURATION) {
			value_type = ICAL_VALUE_DURATION;
			ip.period.duration = p->u.duration;
		} else {
			g_assert_not_reached ();
			return;
		}

		/* Create property */

		period = g_new (struct period, 1);

		period->prop = (* new_prop_func) (ip);
		period->value_param = icalparameter_new_value (value_type);
		icalproperty_add_parameter (period->prop, period->value_param);

		/* Add to list */

		*period_list = g_slist_prepend (*period_list, period);
	}

	*period_list = g_slist_reverse (*period_list);
}

/**
 * cal_component_get_exdate_list:
 * @comp: A calendar component object.
 * @exdate_list: Return value for the list of exception dates, as a list of
 * #CalComponentDateTime structures.  This should be freed using the
 * cal_component_free_exdate_list() function.
 *
 * Queries the list of exception date properties in a calendar component object.
 **/
void
cal_component_get_exdate_list (CalComponent *comp, GSList **exdate_list)
{
	CalComponentPrivate *priv;
	GSList *l;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (exdate_list != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	*exdate_list = NULL;

	for (l = priv->exdate_list; l; l = l->next) {
		struct datetime *dt;
		CalComponentDateTime *cdt;

		dt = l->data;

		cdt = g_new (CalComponentDateTime, 1);
		cdt->value = g_new (struct icaltimetype, 1);

		*cdt->value = icalproperty_get_exdate (dt->prop);

		if (dt->tzid_param)
			cdt->tzid = g_strdup (icalparameter_get_tzid (dt->tzid_param));
		else
			cdt->tzid = NULL;

		*exdate_list = g_slist_prepend (*exdate_list, cdt);
	}

	*exdate_list = g_slist_reverse (*exdate_list);
}

/**
 * cal_component_set_exdate_list:
 * @comp: A calendar component object.
 * @exdate_list: List of #CalComponentDateTime structures.
 *
 * Sets the list of exception dates in a calendar component object.
 **/
void
cal_component_set_exdate_list (CalComponent *comp, GSList *exdate_list)
{
	CalComponentPrivate *priv;
	GSList *l;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	/* Remove old exception dates */

	for (l = priv->exdate_list; l; l = l->next) {
		struct datetime *dt;

		dt = l->data;

		/* Removing the DATE or DATE-TIME property will also remove
		   any TZID parameter. */
		icalcomponent_remove_property (priv->icalcomp, dt->prop);
		icalproperty_free (dt->prop);
		g_free (dt);
	}

	g_slist_free (priv->exdate_list);
	priv->exdate_list = NULL;

	/* Add in new exception dates */

	for (l = exdate_list; l; l = l->next) {
		CalComponentDateTime *cdt;
		struct datetime *dt;

		g_assert (l->data != NULL);
		cdt = l->data;

		g_assert (cdt->value != NULL);

		dt = g_new (struct datetime, 1);
		dt->prop = icalproperty_new_exdate (*cdt->value);

		if (cdt->tzid) {
			dt->tzid_param = icalparameter_new_tzid ((char *) cdt->tzid);
			icalproperty_add_parameter (dt->prop, dt->tzid_param);
		} else
			dt->tzid_param = NULL;

		icalcomponent_add_property (priv->icalcomp, dt->prop);
		priv->exdate_list = g_slist_prepend (priv->exdate_list, dt);
	}

	priv->exdate_list = g_slist_reverse (priv->exdate_list);

	priv->need_sequence_inc = TRUE;
}

/**
 * cal_component_has_exdates:
 * @comp: A calendar component object.
 *
 * Queries whether a calendar component object has any exception dates defined
 * for it.
 *
 * Return value: TRUE if the component has exception dates, FALSE otherwise.
 **/
gboolean
cal_component_has_exdates (CalComponent *comp)
{
	CalComponentPrivate *priv;

	g_return_val_if_fail (comp != NULL, FALSE);
	g_return_val_if_fail (IS_CAL_COMPONENT (comp), FALSE);

	priv = comp->priv;
	g_return_val_if_fail (priv->icalcomp != NULL, FALSE);

	return (priv->exdate_list != NULL);
}

/* Gets a list of recurrence rules */
static void
get_recur_list (GSList *recur_list,
		struct icalrecurrencetype (* get_prop_func) (icalproperty *prop),
		GSList **list)
{
	GSList *l;

	*list = NULL;

	for (l = recur_list; l; l = l->next) {
		icalproperty *prop;
		struct icalrecurrencetype *r;

		prop = l->data;

		r = g_new (struct icalrecurrencetype, 1);
		*r = (* get_prop_func) (prop);

		*list = g_slist_prepend (*list, r);
	}

	*list = g_slist_reverse (*list);
}

/* Sets a list of recurrence rules */
static void
set_recur_list (CalComponent *comp,
		icalproperty *(* new_prop_func) (struct icalrecurrencetype recur),
		GSList **recur_list,
		GSList *rl)
{
	CalComponentPrivate *priv;
	GSList *l;

	priv = comp->priv;

	/* Remove old recurrences */

	for (l = *recur_list; l; l = l->next) {
		icalproperty *prop;

		prop = l->data;
		icalcomponent_remove_property (priv->icalcomp, prop);
		icalproperty_free (prop);
	}

	g_slist_free (*recur_list);
	*recur_list = NULL;

	/* Add in new recurrences */

	for (l = rl; l; l = l->next) {
		icalproperty *prop;
		struct icalrecurrencetype *recur;

		g_assert (l->data != NULL);
		recur = l->data;

		prop = (* new_prop_func) (*recur);
		icalcomponent_add_property (priv->icalcomp, prop);

		*recur_list = g_slist_prepend (*recur_list, prop);
	}

	*recur_list = g_slist_reverse (*recur_list);
}

/**
 * cal_component_get_exrule_list:
 * @comp: A calendar component object.
 * @recur_list: List of exception rules as struct #icalrecurrencetype
 * structures.  This should be freed using the cal_component_free_recur_list()
 * function.
 *
 * Queries the list of exception rule properties of a calendar component
 * object.
 **/
void
cal_component_get_exrule_list (CalComponent *comp, GSList **recur_list)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (recur_list != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	get_recur_list (priv->exrule_list, icalproperty_get_exrule, recur_list);
}

/**
 * cal_component_get_exrule_property_list:
 * @comp: A calendar component object.
 * @recur_list: Returns a list of exception rule properties.
 *
 * Queries the list of exception rule properties of a calendar component object.
 **/
void
cal_component_get_exrule_property_list (CalComponent *comp, GSList **recur_list)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (recur_list != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	*recur_list = priv->exrule_list;
}

/**
 * cal_component_set_exrule_list:
 * @comp: A calendar component object.
 * @recur_list: List of struct #icalrecurrencetype structures.
 *
 * Sets the list of exception rules in a calendar component object.
 **/
void
cal_component_set_exrule_list (CalComponent *comp, GSList *recur_list)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	set_recur_list (comp, icalproperty_new_exrule, &priv->exrule_list, recur_list);

	priv->need_sequence_inc = TRUE;
}

/**
 * cal_component_has_exrules:
 * @comp: A calendar component object.
 *
 * Queries whether a calendar component object has any exception rules defined
 * for it.
 *
 * Return value: TRUE if the component has exception rules, FALSE otherwise.
 **/
gboolean
cal_component_has_exrules (CalComponent *comp)
{
	CalComponentPrivate *priv;

	g_return_val_if_fail (comp != NULL, FALSE);
	g_return_val_if_fail (IS_CAL_COMPONENT (comp), FALSE);

	priv = comp->priv;
	g_return_val_if_fail (priv->icalcomp != NULL, FALSE);

	return (priv->exrule_list != NULL);
}

/**
 * cal_component_has_exceptions:
 * @comp: A calendar component object
 *
 * Queries whether a calendar component object has any exception dates
 * or exception rules.
 *
 * Return value: TRUE if the component has exceptions, FALSE otherwise.
 **/
gboolean
cal_component_has_exceptions (CalComponent *comp)
{
	return cal_component_has_exdates (comp) || cal_component_has_exrules (comp);
}

/**
 * cal_component_get_geo:
 * @comp: A calendar component object.
 * @geo: Return value for the geographic position property.  This should be
 * freed using the cal_component_free_geo() function.
 *
 * Sets the geographic position property of a calendar component object.
 **/
void
cal_component_get_geo (CalComponent *comp, struct icalgeotype **geo)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (geo != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (priv->geo) {
		*geo = g_new (struct icalgeotype, 1);
		**geo = icalproperty_get_geo (priv->geo);
	} else
		*geo = NULL;
}

/**
 * cal_component_set_geo:
 * @comp: A calendar component object.
 * @geo: Value for the geographic position property.
 *
 * Sets the geographic position property on a calendar component object.
 **/
void
cal_component_set_geo (CalComponent *comp, struct icalgeotype *geo)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (!geo) {
		if (priv->geo) {
			icalcomponent_remove_property (priv->icalcomp, priv->geo);
			icalproperty_free (priv->geo);
			priv->geo = NULL;
		}

		return;
	}

	if (priv->geo)
		icalproperty_set_geo (priv->geo, *geo);
	else {
		priv->geo = icalproperty_new_geo (*geo);
		icalcomponent_add_property (priv->icalcomp, priv->geo);
	}
}

/**
 * cal_component_get_last_modified:
 * @comp: A calendar component object.
 * @t: Return value for the last modified time value.
 *
 * Queries the time at which a calendar component object was last modified in
 * the calendar store.
 **/
void
cal_component_get_last_modified (CalComponent *comp, struct icaltimetype **t)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (t != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	get_icaltimetype (priv->last_modified, icalproperty_get_lastmodified, t);
}

/**
 * cal_component_set_last_modified:
 * @comp: A calendar component object.
 * @t: Value for the last time modified.
 *
 * Sets the time at which a calendar component object was last stored in the
 * calendar store.  This should not be called by plain calendar user agents.
 **/
void
cal_component_set_last_modified (CalComponent *comp, struct icaltimetype *t)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	set_icaltimetype (comp, &priv->last_modified,
			  icalproperty_new_lastmodified,
			  icalproperty_set_lastmodified,
			  t);
}

/**
 * cal_component_get_organizer:
 * @comp:  A calendar component object
 * @organizer: A value for the organizer
 * 
 * Queries the organizer property of a calendar component object
 **/
void
cal_component_get_organizer (CalComponent *comp, CalComponentOrganizer *organizer)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (organizer != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (priv->organizer.prop)
		organizer->value = icalproperty_get_organizer (priv->organizer.prop);
	else
		organizer->value = NULL;

	if (priv->organizer.sentby_param)
		organizer->sentby = icalparameter_get_sentby (priv->organizer.sentby_param);
	else
		organizer->sentby = NULL;

	if (priv->organizer.cn_param)
		organizer->cn = icalparameter_get_sentby (priv->organizer.cn_param);
	else
		organizer->cn = NULL;

	if (priv->organizer.language_param)
		organizer->language = icalparameter_get_sentby (priv->organizer.language_param);
	else
		organizer->language = NULL;

}

/**
 * cal_component_set_organizer:
 * @comp:  A calendar component object.
 * @organizer: Value for the organizer property
 * 
 * Sets the organizer of a calendar component object
 **/
void
cal_component_set_organizer (CalComponent *comp, CalComponentOrganizer *organizer)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (!organizer) {
		if (priv->organizer.prop) {
			icalcomponent_remove_property (priv->icalcomp, priv->organizer.prop);
			icalproperty_free (priv->organizer.prop);

			priv->organizer.prop = NULL;
			priv->organizer.sentby_param = NULL;
			priv->organizer.cn_param = NULL;
			priv->organizer.language_param = NULL;
		}

		return;
	}

	g_return_if_fail (organizer->value != NULL);

	if (priv->organizer.prop)
		icalproperty_set_organizer (priv->organizer.prop, (char *) organizer->value);
	else {
		priv->organizer.prop = icalproperty_new_organizer ((char *) organizer->value);
		icalcomponent_add_property (priv->icalcomp, priv->organizer.prop);
	}

	if (organizer->sentby) {
		g_assert (priv->organizer.prop != NULL);

		if (priv->organizer.sentby_param)
			icalparameter_set_sentby (priv->organizer.sentby_param,
						  (char *) organizer->sentby);
		else {
			priv->organizer.sentby_param = icalparameter_new_sentby (
				(char *) organizer->sentby);
			icalproperty_add_parameter (priv->organizer.prop,
						    priv->organizer.sentby_param);
		}
	} else if (priv->organizer.sentby_param) {
		icalproperty_remove_parameter (priv->organizer.prop, ICAL_SENTBY_PARAMETER);
		icalparameter_free (priv->organizer.sentby_param);
		priv->organizer.sentby_param = NULL;
	}

	if (organizer->cn) {
		g_assert (priv->organizer.prop != NULL);

		if (priv->organizer.cn_param)
			icalparameter_set_cn (priv->organizer.cn_param,
						  (char *) organizer->cn);
		else {
			priv->organizer.cn_param = icalparameter_new_cn (
				(char *) organizer->cn);
			icalproperty_add_parameter (priv->organizer.prop,
						    priv->organizer.cn_param);
		}
	} else if (priv->organizer.cn_param) {
		icalproperty_remove_parameter (priv->organizer.prop, ICAL_CN_PARAMETER);
		icalparameter_free (priv->organizer.cn_param);
		priv->organizer.cn_param = NULL;
	}

	if (organizer->language) {
		g_assert (priv->organizer.prop != NULL);

		if (priv->organizer.language_param)
			icalparameter_set_language (priv->organizer.language_param,
						  (char *) organizer->language);
		else {
			priv->organizer.language_param = icalparameter_new_language (
				(char *) organizer->language);
			icalproperty_add_parameter (priv->organizer.prop,
						    priv->organizer.language_param);
		}
	} else if (priv->organizer.language_param) {
		icalproperty_remove_parameter (priv->organizer.prop, ICAL_LANGUAGE_PARAMETER);
		icalparameter_free (priv->organizer.language_param);
		priv->organizer.language_param = NULL;
	}


}
		
/**
 * cal_component_get_percent:
 * @comp: A calendar component object.
 * @percent: Return value for the percent-complete property.  This should be
 * freed using the cal_component_free_percent() function.
 *
 * Queries the percent-complete property of a calendar component object.
 **/
void
cal_component_get_percent (CalComponent *comp, int **percent)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (percent != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (priv->percent) {
		*percent = g_new (int, 1);
		**percent = icalproperty_get_percentcomplete (priv->percent);
	} else
		*percent = NULL;
}

/**
 * cal_component_set_percent:
 * @comp: A calendar component object.
 * @percent: Value for the percent-complete property.
 *
 * Sets the percent-complete property of a calendar component object.
 **/
void
cal_component_set_percent (CalComponent *comp, int *percent)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (!percent) {
		if (priv->percent) {
			icalcomponent_remove_property (priv->icalcomp, priv->percent);
			icalproperty_free (priv->percent);
			priv->percent = NULL;
		}

		return;
	}

	g_return_if_fail (*percent >= 0 && *percent <= 100);

	if (priv->percent)
		icalproperty_set_percentcomplete (priv->percent, *percent);
	else {
		priv->percent = icalproperty_new_percentcomplete (*percent);
		icalcomponent_add_property (priv->icalcomp, priv->percent);
	}
}

/**
 * cal_component_get_priority:
 * @comp: A calendar component object.
 * @priority: Return value for the priority property.  This should be freed using
 * the cal_component_free_priority() function.
 *
 * Queries the priority property of a calendar component object.
 **/
void
cal_component_get_priority (CalComponent *comp, int **priority)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (priority != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (priv->priority) {
		*priority = g_new (int, 1);
		**priority = icalproperty_get_priority (priv->priority);
	} else
		*priority = NULL;
}

/**
 * cal_component_set_priority:
 * @comp: A calendar component object.
 * @priority: Value for the priority property.
 *
 * Sets the priority property of a calendar component object.
 **/
void
cal_component_set_priority (CalComponent *comp, int *priority)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (!priority) {
		if (priv->priority) {
			icalcomponent_remove_property (priv->icalcomp, priv->priority);
			icalproperty_free (priv->priority);
			priv->priority = NULL;
		}

		return;
	}

	g_return_if_fail (*priority >= 0 && *priority <= 9);

	if (priv->priority)
		icalproperty_set_priority (priv->priority, *priority);
	else {
		priv->priority = icalproperty_new_priority (*priority);
		icalcomponent_add_property (priv->icalcomp, priv->priority);
	}
}

/**
 * cal_component_get_recurid:
 * @comp: A calendar component object.
 * @recur_id: Return value for the recurrence id property
 * 
 * Queries the recurrence id property of a calendar component object
 **/
void 
cal_component_get_recurid (CalComponent *comp, CalComponentRange **recur_id)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (recur_id != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	get_datetime (&priv->recur_id.recur_time, 
		      icalproperty_get_recurrenceid, 
		      (*recur_id)->datetime);
}

/**
 * cal_component_set_recurid:
 * @comp: A calendar component object.
 * @recur_id: Value for the recurrence id property.
 * 
 * Sets the recurrence id property of a calendar component object.
 **/
void
cal_component_set_recurid (CalComponent *comp, CalComponentRange *recur_id)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);
	
	set_datetime (comp, &priv->recur_id.recur_time,
		      icalproperty_new_recurrenceid,
		      icalproperty_set_recurrenceid,
		      recur_id->datetime);
}

/**
 * cal_component_get_rdate_list:
 * @comp: A calendar component object.
 * @period_list: Return value for the list of recurrence dates, as a list of
 * #CalComponentPeriod structures.  This should be freed using the
 * cal_component_free_period_list() function.
 *
 * Queries the list of recurrence date properties in a calendar component
 * object.
 **/
void
cal_component_get_rdate_list (CalComponent *comp, GSList **period_list)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (period_list != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	get_period_list (priv->rdate_list, icalproperty_get_rdate, period_list);
}

/**
 * cal_component_set_rdate_list:
 * @comp: A calendar component object.
 * @period_list: List of #CalComponentPeriod structures.
 *
 * Sets the list of recurrence dates in a calendar component object.
 **/
void
cal_component_set_rdate_list (CalComponent *comp, GSList *period_list)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	set_period_list (comp, icalproperty_new_rdate, &priv->rdate_list, period_list);

	priv->need_sequence_inc = TRUE;
}

/**
 * cal_component_has_rdates:
 * @comp: A calendar component object.
 *
 * Queries whether a calendar component object has any recurrence dates defined
 * for it.
 *
 * Return value: TRUE if the component has recurrence dates, FALSE otherwise.
 **/
gboolean
cal_component_has_rdates (CalComponent *comp)
{
	CalComponentPrivate *priv;

	g_return_val_if_fail (comp != NULL, FALSE);
	g_return_val_if_fail (IS_CAL_COMPONENT (comp), FALSE);

	priv = comp->priv;
	g_return_val_if_fail (priv->icalcomp != NULL, FALSE);

	return (priv->rdate_list != NULL);
}

/**
 * cal_component_get_rrule_list:
 * @comp: A calendar component object.
 * @recur_list: List of recurrence rules as struct #icalrecurrencetype
 * structures.  This should be freed using the cal_component_free_recur_list()
 * function.
 *
 * Queries the list of recurrence rule properties of a calendar component
 * object.
 **/
void
cal_component_get_rrule_list (CalComponent *comp, GSList **recur_list)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (recur_list != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	get_recur_list (priv->rrule_list, icalproperty_get_rrule, recur_list);
}

/**
 * cal_component_get_rrule_property_list:
 * @comp: A calendar component object.
 * @recur_list: Returns a list of recurrence rule properties.
 *
 * Queries a list of recurrence rule properties of a calendar component object.
 **/
void
cal_component_get_rrule_property_list (CalComponent *comp, GSList **recur_list)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (recur_list != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	*recur_list = priv->rrule_list;
}

/**
 * cal_component_set_rrule_list:
 * @comp: A calendar component object.
 * @recur_list: List of struct #icalrecurrencetype structures.
 *
 * Sets the list of recurrence rules in a calendar component object.
 **/
void
cal_component_set_rrule_list (CalComponent *comp, GSList *recur_list)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	set_recur_list (comp, icalproperty_new_rrule, &priv->rrule_list, recur_list);

	priv->need_sequence_inc = TRUE;
}

/**
 * cal_component_has_rrules:
 * @comp: A calendar component object.
 *
 * Queries whether a calendar component object has any recurrence rules defined
 * for it.
 *
 * Return value: TRUE if the component has recurrence rules, FALSE otherwise.
 **/
gboolean
cal_component_has_rrules (CalComponent *comp)
{
	CalComponentPrivate *priv;

	g_return_val_if_fail (comp != NULL, FALSE);
	g_return_val_if_fail (IS_CAL_COMPONENT (comp), FALSE);

	priv = comp->priv;
	g_return_val_if_fail (priv->icalcomp != NULL, FALSE);

	return (priv->rrule_list != NULL);
}

/**
 * cal_component_has_recurrences:
 * @comp: A calendar component object
 *
 * Queries whether a calendar component object has any recurrence dates or
 * recurrence rules.
 *
 * Return value: TRUE if the component has recurrences, FALSE otherwise.
 **/
gboolean
cal_component_has_recurrences (CalComponent *comp)
{
	return cal_component_has_rdates (comp) || cal_component_has_rrules (comp);
}

/**
 * cal_component_get_sequence:
 * @comp: A calendar component object.
 * @sequence: Return value for the sequence number.  This should be freed using
 * cal_component_free_sequence().
 *
 * Queries the sequence number of a calendar component object.
 **/
void
cal_component_get_sequence (CalComponent *comp, int **sequence)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (sequence != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (!priv->sequence) {
		*sequence = NULL;
		return;
	}

	*sequence = g_new (int, 1);
	**sequence = icalproperty_get_sequence (priv->sequence);
}

/**
 * cal_component_set_sequence:
 * @comp: A calendar component object.
 * @sequence: Sequence number value.
 *
 * Sets the sequence number of a calendar component object.  Normally this
 * function should not be called, since the sequence number is incremented
 * automatically at the proper times.
 **/
void
cal_component_set_sequence (CalComponent *comp, int *sequence)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	priv->need_sequence_inc = FALSE;

	if (!sequence) {
		if (priv->sequence) {
			icalcomponent_remove_property (priv->icalcomp, priv->sequence);
			icalproperty_free (priv->sequence);
			priv->sequence = NULL;
		}

		return;
	}

	if (priv->sequence)
		icalproperty_set_sequence (priv->sequence, *sequence);
	else {
		priv->sequence = icalproperty_new_sequence (*sequence);
		icalcomponent_add_property (priv->icalcomp, priv->sequence);
	}
}

/**
 * cal_component_get_status:
 * @comp: A calendar component object.
 * @status: Return value for the status value.  It is set to #ICAL_STATUS_NONE
 * if the component has no status property.
 *
 * Queries the status property of a calendar component object.
 **/
void
cal_component_get_status (CalComponent *comp, icalproperty_status *status)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (status != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (!priv->status) {
		*status = ICAL_STATUS_NONE;
		return;
	}

	*status = icalproperty_get_status (priv->status);
}

/**
 * cal_component_set_status:
 * @comp: A calendar component object.
 * @status: Status value.  You should use #ICAL_STATUS_NONE if you want to unset
 * this property.
 *
 * Sets the status property of a calendar component object.
 **/
void
cal_component_set_status (CalComponent *comp, icalproperty_status status)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	priv->need_sequence_inc = TRUE;

	if (status == ICAL_STATUS_NONE) {
		if (priv->status) {
			icalcomponent_remove_property (priv->icalcomp, priv->status);
			icalproperty_free (priv->status);
			priv->status = NULL;
		}

		return;
	}

	if (priv->status) {
		icalproperty_set_status (priv->status, status);
	} else {
		priv->status = icalproperty_new_status (status);
		icalcomponent_add_property (priv->icalcomp, priv->status);
	}
}

/**
 * cal_component_get_summary:
 * @comp: A calendar component object.
 * @summary: Return value for the summary property and its parameters.
 *
 * Queries the summary of a calendar component object.
 **/
void
cal_component_get_summary (CalComponent *comp, CalComponentText *summary)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (summary != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (priv->summary.prop)
		summary->value = icalproperty_get_summary (priv->summary.prop);
	else
		summary->value = NULL;

	if (priv->summary.altrep_param)
		summary->altrep = icalparameter_get_altrep (priv->summary.altrep_param);
	else
		summary->altrep = NULL;
}

/**
 * cal_component_set_summary:
 * @comp: A calendar component object.
 * @summary: Summary property and its parameters.
 *
 * Sets the summary of a calendar component object.
 **/
void
cal_component_set_summary (CalComponent *comp, CalComponentText *summary)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (!summary) {
		if (priv->summary.prop) {
			icalcomponent_remove_property (priv->icalcomp, priv->summary.prop);
			icalproperty_free (priv->summary.prop);

			priv->summary.prop = NULL;
			priv->summary.altrep_param = NULL;
		}

		return;
	}

	g_return_if_fail (summary->value != NULL);

	if (priv->summary.prop)
		icalproperty_set_summary (priv->summary.prop, (char *) summary->value);
	else {
		priv->summary.prop = icalproperty_new_summary ((char *) summary->value);
		icalcomponent_add_property (priv->icalcomp, priv->summary.prop);
	}

	if (summary->altrep) {
		g_assert (priv->summary.prop != NULL);

		if (priv->summary.altrep_param)
			icalparameter_set_altrep (priv->summary.altrep_param,
						  (char *) summary->altrep);
		else {
			priv->summary.altrep_param = icalparameter_new_altrep (
				(char *) summary->altrep);
			icalproperty_add_parameter (priv->summary.prop,
						    priv->summary.altrep_param);
		}
	} else if (priv->summary.altrep_param) {
		icalproperty_remove_parameter (priv->summary.prop, ICAL_ALTREP_PARAMETER);
		icalparameter_free (priv->summary.altrep_param);
		priv->summary.altrep_param = NULL;
	}
}

/**
 * cal_component_get_transparency:
 * @comp: A calendar component object.
 * @transp: Return value for the time transparency.
 *
 * Queries the time transparency of a calendar component object.
 **/
void
cal_component_get_transparency (CalComponent *comp, CalComponentTransparency *transp)
{
	CalComponentPrivate *priv;
	const char *val;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (transp != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (!priv->transparency) {
		*transp = CAL_COMPONENT_TRANSP_NONE;
		return;
	}

	val = icalproperty_get_transp (priv->transparency);

	if (strcasecmp (val, "TRANSPARENT") == 0)
		*transp = CAL_COMPONENT_TRANSP_TRANSPARENT;
	else if (strcasecmp (val, "OPAQUE") == 0)
		*transp = CAL_COMPONENT_TRANSP_OPAQUE;
	else
		*transp = CAL_COMPONENT_TRANSP_UNKNOWN;
}

/**
 * cal_component_set_transparency:
 * @comp: A calendar component object.
 * @transp: Time transparency value.
 *
 * Sets the time transparency of a calendar component object.
 **/
void
cal_component_set_transparency (CalComponent *comp, CalComponentTransparency transp)
{
	CalComponentPrivate *priv;
	char *str;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (transp != CAL_COMPONENT_TRANSP_UNKNOWN);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);


	if (transp == CAL_COMPONENT_TRANSP_NONE) {
		if (priv->transparency) {
			icalcomponent_remove_property (priv->icalcomp, priv->transparency);
			icalproperty_free (priv->transparency);
			priv->transparency = NULL;
		}

		return;
	}

	switch (transp) {
	case CAL_COMPONENT_TRANSP_TRANSPARENT:
		str = "TRANSPARENT";
		break;

	case CAL_COMPONENT_TRANSP_OPAQUE:
		str = "OPAQUE";
		break;

	default:
		g_assert_not_reached ();
		str = NULL;
	}

	if (priv->transparency)
		icalproperty_set_transp (priv->transparency, str);
	else {
		priv->transparency = icalproperty_new_transp (str);
		icalcomponent_add_property (priv->icalcomp, priv->transparency);
	}
}

/**
 * cal_component_get_url:
 * @comp: A calendar component object.
 * @url: Return value for the URL.
 *
 * Queries the uniform resource locator property of a calendar component object.
 **/
void
cal_component_get_url (CalComponent *comp, const char **url)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (url != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (priv->url)
		*url = icalproperty_get_url (priv->url);
	else
		*url = NULL;
}

/**
 * cal_component_set_url:
 * @comp: A calendar component object.
 * @url: URL value.
 *
 * Sets the uniform resource locator property of a calendar component object.
 **/
void
cal_component_set_url (CalComponent *comp, const char *url)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	if (!url || !(*url)) {
		if (priv->url) {
			icalcomponent_remove_property (priv->icalcomp, priv->url);
			icalproperty_free (priv->url);
			priv->url = NULL;
		}

		return;
	}

	if (priv->url)
		icalproperty_set_url (priv->url, (char *) url);
	else {
		priv->url = icalproperty_new_url ((char *) url);
		icalcomponent_add_property (priv->icalcomp, priv->url);
	}
}

/* Gets a text list value */
static void
get_attendee_list (GSList *attendee_list, GSList **al)
{
	GSList *l;

	*al = NULL;

	if (!attendee_list)
		return;

	for (l = attendee_list; l; l = l->next) {
		struct attendee *attendee;
		CalComponentAttendee *a;

		attendee = l->data;
		g_assert (attendee->prop != NULL);

		a = g_new0 (CalComponentAttendee, 1);
		a->value = icalproperty_get_attendee (attendee->prop);

		if (attendee->member_param)
			a->member = icalparameter_get_member (attendee->member_param);
		if (attendee->cutype_param) {
			switch (icalparameter_get_cutype (attendee->cutype_param)) {
			case ICAL_CUTYPE_INDIVIDUAL:
				a->cutype = CAL_COMPONENT_CUTYPE_INDIVIDUAL;
				break;
			case ICAL_CUTYPE_GROUP:
				a->cutype = CAL_COMPONENT_CUTYPE_GROUP;
				break;
			case ICAL_CUTYPE_RESOURCE:
				a->cutype = CAL_COMPONENT_CUTYPE_RESOURCE;
				break;
			case ICAL_CUTYPE_ROOM:
				a->cutype = CAL_COMPONENT_CUTYPE_ROOM;
				break;
			default:
				a->cutype = CAL_COMPONENT_CUTYPE_UNKNOWN;
			}
		}
			
		if (attendee->role_param) {
			switch (icalparameter_get_role (attendee->role_param)) {
			case ICAL_ROLE_CHAIR:
				a->role = CAL_COMPONENT_ROLE_CHAIR;
				break;
			case ICAL_ROLE_REQPARTICIPANT:
				a->role = CAL_COMPONENT_ROLE_REQUIRED;
				break;
			case ICAL_ROLE_OPTPARTICIPANT:
				a->role = CAL_COMPONENT_ROLE_OPTIONAL;
				break;
			case ICAL_ROLE_NONPARTICIPANT:
				a->role = CAL_COMPONENT_ROLE_NON;
				break;
			default:
				a->role = CAL_COMPONENT_ROLE_UNKNOWN;
			}
		}

		if (attendee->partstat_param) {
			switch (icalparameter_get_role (attendee->partstat_param)) {
			case ICAL_PARTSTAT_NEEDSACTION:
				a->status = CAL_COMPONENT_PARTSTAT_NEEDSACTION;
				break;
			case ICAL_PARTSTAT_ACCEPTED:
				a->status = CAL_COMPONENT_PARTSTAT_ACCEPTED;
				break;
			case ICAL_PARTSTAT_DECLINED:
				a->status = CAL_COMPONENT_PARTSTAT_DECLINED;
				break;
			case ICAL_PARTSTAT_TENTATIVE:
				a->status = CAL_COMPONENT_PARTSTAT_TENTATIVE;
				break;
			case ICAL_PARTSTAT_DELEGATED:
				a->status = CAL_COMPONENT_PARTSTAT_DELEGATED;
				break;
			case ICAL_PARTSTAT_COMPLETED:
				a->status = CAL_COMPONENT_PARTSTAT_COMPLETED;
				break;
			case ICAL_PARTSTAT_INPROCESS:
				a->status = CAL_COMPONENT_PARTSTAT_INPROCESS;
				break;
			default:
				a->status = CAL_COMPONENT_PARTSTAT_UNKNOWN;
			}
		}

		if (attendee->rsvp_param && icalparameter_get_rsvp (attendee->rsvp_param) == ICAL_RSVP_TRUE)
			a->rsvp = TRUE;
		else
			a->rsvp = FALSE;

		if (attendee->delfrom_param)
			a->delfrom = icalparameter_get_sentby (attendee->delfrom_param);
		if (attendee->delto_param)
			a->delto = icalparameter_get_sentby (attendee->delto_param);
		if (attendee->sentby_param)
			a->sentby = icalparameter_get_sentby (attendee->sentby_param);
		if (attendee->cn_param)
			a->cn = icalparameter_get_sentby (attendee->cn_param);
		if (attendee->language_param)
			a->language = icalparameter_get_sentby (attendee->language_param);

		*al = g_slist_prepend (*al, a);
	}

	*al = g_slist_reverse (*al);
}


/* Sets a text list value */
static void
set_attendee_list (CalComponent *comp,
		   GSList **attendee_list,
		   GSList *al)
{
	CalComponentPrivate *priv;
	GSList *l;

	priv = comp->priv;

	/* Remove old attendees */

	for (l = *attendee_list; l; l = l->next) {
		struct attendee *attendee;

		attendee = l->data;
		g_assert (attendee->prop != NULL);

		icalcomponent_remove_property (priv->icalcomp, attendee->prop);
		icalproperty_free (attendee->prop);
		g_free (attendee);
	}

	g_slist_free (*attendee_list);
	*attendee_list = NULL;

	/* Add in new attendees */

	for (l = al; l; l = l->next) {
		CalComponentAttendee *a;
		struct attendee *attendee;
		icalparameter_cutype ct;
		icalparameter_role r;
		icalparameter_partstat p;

		a = l->data;
		g_return_if_fail (a->value != NULL);

		attendee = g_new0 (struct attendee, 1);

		attendee->prop = icalproperty_new_attendee (a->value);
		icalcomponent_add_property (priv->icalcomp, attendee->prop);

		if (a->member) {
			attendee->member_param = icalparameter_new_member (a->member);
			icalproperty_add_parameter (attendee->prop, attendee->member_param);
		}

		switch (a->cutype) {
			case CAL_COMPONENT_CUTYPE_INDIVIDUAL:
				ct = ICAL_CUTYPE_INDIVIDUAL;
				break;
			case CAL_COMPONENT_CUTYPE_GROUP:
				ct = ICAL_CUTYPE_GROUP;
				break;
			case CAL_COMPONENT_CUTYPE_RESOURCE:
				ct = ICAL_CUTYPE_RESOURCE;
				break;
			case CAL_COMPONENT_CUTYPE_ROOM:
				ct = ICAL_CUTYPE_ROOM;
				break;
			default:
				ct = ICAL_CUTYPE_UNKNOWN;
		}
		attendee->cutype_param = icalparameter_new_cutype (ct);
		icalproperty_add_parameter (attendee->prop, attendee->cutype_param);

		switch (a->role) {
			case CAL_COMPONENT_ROLE_CHAIR:
				r = ICAL_ROLE_CHAIR;
				break;
			case CAL_COMPONENT_ROLE_REQUIRED:
				r = ICAL_ROLE_REQPARTICIPANT;
				break;
			case CAL_COMPONENT_ROLE_OPTIONAL:
				r = ICAL_ROLE_OPTPARTICIPANT;
				break;
			case CAL_COMPONENT_ROLE_NON:
				r = ICAL_ROLE_NONPARTICIPANT;
				break;
			default:
				r = ICAL_ROLE_NONE;
		}
		attendee->role_param = icalparameter_new_role (r);
		icalproperty_add_parameter (attendee->prop, attendee->role_param);

		switch (a->status) {
			case CAL_COMPONENT_PARTSTAT_NEEDSACTION:
				p = ICAL_PARTSTAT_NEEDSACTION;
				break;
			case CAL_COMPONENT_PARTSTAT_ACCEPTED:
				p = ICAL_PARTSTAT_ACCEPTED;
				break;
			case CAL_COMPONENT_PARTSTAT_DECLINED:
				p = ICAL_PARTSTAT_DECLINED;
				break;
			case CAL_COMPONENT_PARTSTAT_TENTATIVE:
				p = ICAL_PARTSTAT_TENTATIVE;
				break;
			case CAL_COMPONENT_PARTSTAT_DELEGATED:
				p = ICAL_PARTSTAT_DELEGATED;
				break;
			case CAL_COMPONENT_PARTSTAT_COMPLETED:
				p = ICAL_PARTSTAT_COMPLETED;
				break;
			case CAL_COMPONENT_PARTSTAT_INPROCESS:
				p = ICAL_PARTSTAT_INPROCESS;
				break;
			default:
				p = ICAL_PARTSTAT_NONE;
		}
		attendee->partstat_param = icalparameter_new_partstat (p);
		icalproperty_add_parameter (attendee->prop, attendee->partstat_param);

		if (a->rsvp)
			attendee->rsvp_param = icalparameter_new_rsvp (ICAL_RSVP_TRUE);
		else
			attendee->rsvp_param = icalparameter_new_rsvp (ICAL_RSVP_FALSE);
		icalproperty_add_parameter (attendee->prop, attendee->rsvp_param);
	
		if (a->delfrom) {
			attendee->delfrom_param = icalparameter_new_delegatedfrom (a->delfrom);
			icalproperty_add_parameter (attendee->prop, attendee->delfrom_param);
		}
		if (a->delto) {
			attendee->delto_param = icalparameter_new_delegatedto (a->delto);
			icalproperty_add_parameter (attendee->prop, attendee->delto_param);
		}
		if (a->sentby) {
			attendee->sentby_param = icalparameter_new_sentby (a->sentby);
			icalproperty_add_parameter (attendee->prop, attendee->sentby_param);
		}
		if (a->cn) {
			attendee->cn_param = icalparameter_new_cn (a->cn);
			icalproperty_add_parameter (attendee->prop, attendee->cn_param);
		}
		if (a->language) {
			attendee->language_param = icalparameter_new_language (a->language);
			icalproperty_add_parameter (attendee->prop, attendee->language_param);
		}

		*attendee_list = g_slist_prepend (*attendee_list, attendee);
	}

	*attendee_list = g_slist_reverse (*attendee_list);
}

/**
 * cal_component_get_attendee_list: 
 * @comp: A calendar component object. 
 * @attendee_list: Return value for the attendee property.
 * This should be freed using the cal_component_free_attendee_list ()
 * function.
 * 
 * Queries the attendee properties of the calendar component object
 **/
void
cal_component_get_attendee_list (CalComponent *comp, GSList **attendee_list)
{
	CalComponentPrivate *priv;
	
	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (attendee_list != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	get_attendee_list (priv->attendee_list, attendee_list);
}

/**
 * cal_component_set_attendee_list:
 * @comp: A calendar component object. 
 * @attendee_list: Values for attendee properties
 * 
 * Sets the attendees of a calendar component object
 **/
void
cal_component_set_attendee_list (CalComponent *comp, GSList *attendee_list)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	set_attendee_list (comp, &priv->attendee_list, attendee_list);
}




/**
 * cal_component_free_categories_list:
 * @categ_list: List of category strings.
 *
 * Frees a list of category strings.
 **/
void
cal_component_free_categories_list (GSList *categ_list)
{
	GSList *l;

	for (l = categ_list; l; l = l->next)
		g_free (l->data);

	g_slist_free (categ_list);
}

/**
 * cal_component_free_datetime:
 * @dt: A date/time structure.
 *
 * Frees a date/time structure.
 **/
void
cal_component_free_datetime (CalComponentDateTime *dt)
{
	g_return_if_fail (dt != NULL);

	g_free (dt->value);
	g_free ((char*)dt->tzid);
}

/**
 * cal_component_free_exdate_list:
 * @exdate_list: List of #CalComponentDateTime structures.
 *
 * Frees a list of #CalComponentDateTime structures as returned by the
 * cal_component_get_exdate_list() function.
 **/
void
cal_component_free_exdate_list (GSList *exdate_list)
{
	GSList *l;

	for (l = exdate_list; l; l = l->next) {
		CalComponentDateTime *cdt;

		g_assert (l->data != NULL);
		cdt = l->data;

		g_assert (cdt->value != NULL);
		g_free (cdt->value);
		g_free ((char*)cdt->tzid);

		g_free (cdt);
	}

	g_slist_free (exdate_list);
}

/**
 * cal_component_free_geo:
 * @geo: An #icalgeotype structure.
 *
 * Frees a struct #icalgeotype structure as returned by the calendar component
 * functions.
 **/
void
cal_component_free_geo (struct icalgeotype *geo)
{
	g_return_if_fail (geo != NULL);

	g_free (geo);
}

/**
 * cal_component_free_icaltimetype:
 * @t: An #icaltimetype structure.
 *
 * Frees a struct #icaltimetype value as returned by the calendar component
 * functions.
 **/
void
cal_component_free_icaltimetype (struct icaltimetype *t)
{
	g_return_if_fail (t != NULL);

	g_free (t);
}

/**
 * cal_component_free_percent:
 * @percent: Percent value.
 *
 * Frees a percent value as returned by the cal_component_get_percent()
 * function.
 **/
void
cal_component_free_percent (int *percent)
{
	g_return_if_fail (percent != NULL);

	g_free (percent);
}

/**
 * cal_component_free_priority:
 * @priority: Priority value.
 *
 * Frees a priority value as returned by the cal_component_get_priority()
 * function.
 **/
void
cal_component_free_priority (int *priority)
{
	g_return_if_fail (priority != NULL);

	g_free (priority);
}

/**
 * cal_component_free_period_list:
 * @period_list: List of #CalComponentPeriod structures.
 *
 * Frees a list of #CalComponentPeriod structures.
 **/
void
cal_component_free_period_list (GSList *period_list)
{
	GSList *l;

	for (l = period_list; l; l = l->next) {
		CalComponentPeriod *period;

		g_assert (l->data != NULL);

		period = l->data;
		g_free (period);
	}

	g_slist_free (period_list);
}

/**
 * cal_component_free_recur_list:
 * @recur_list: List of struct #icalrecurrencetype structures.
 *
 * Frees a list of struct #icalrecurrencetype structures.
 **/
void
cal_component_free_recur_list (GSList *recur_list)
{
	GSList *l;

	for (l = recur_list; l; l = l->next) {
		struct icalrecurrencetype *r;

		g_assert (l->data != NULL);
		r = l->data;

		g_free (r);
	}

	g_slist_free (recur_list);
}

/**
 * cal_component_free_sequence:
 * @sequence: Sequence number value.
 *
 * Frees a sequence number value.
 **/
void
cal_component_free_sequence (int *sequence)
{
	g_return_if_fail (sequence != NULL);

	g_free (sequence);
}

/**
 * cal_component_free_text_list:
 * @text_list: List of #CalComponentText structures.
 *
 * Frees a list of #CalComponentText structures.  This function should only be
 * used to free lists of text values as returned by the other getter functions
 * of #CalComponent.
 **/
void
cal_component_free_text_list (GSList *text_list)
{
	GSList *l;

	for (l = text_list; l; l = l->next) {
		CalComponentText *text;

		g_assert (l->data != NULL);

		text = l->data;
		g_return_if_fail (text != NULL);
		g_free (text);
	}

	g_slist_free (text_list);
}

/**
 * cal_component_free_attendee_list:
 * @attendee_list: 
 * 
 * 
 **/
void
cal_component_free_attendee_list (GSList *attendee_list)
{
	GSList *l;

	for (l = attendee_list; l; l = l->next) {
		CalComponentAttendee *attendee;

		g_assert (l->data != NULL);

		attendee = l->data;
		g_return_if_fail (attendee != NULL);
		g_free (attendee);
	}

	g_slist_free (attendee_list);
}



/**
 * cal_component_has_alarms:
 * @comp: A calendar component object.
 *
 * Checks whether the component has any alarms.
 *
 * Return value: TRUE if the component has any alarms.
 **/
gboolean
cal_component_has_alarms (CalComponent *comp)
{
	CalComponentPrivate *priv;

	g_return_val_if_fail (comp != NULL, FALSE);
	g_return_val_if_fail (IS_CAL_COMPONENT (comp), FALSE);

	priv = comp->priv;
	g_return_val_if_fail (priv->icalcomp != NULL, FALSE);

	return g_hash_table_size (priv->alarm_uid_hash) != 0;
}

/**
 * cal_component_add_alarm:
 * @comp: A calendar component.
 * @alarm: An alarm.
 * 
 * Adds an alarm subcomponent to a calendar component.  You should have created
 * the @alarm by using cal_component_alarm_new(); it is invalid to use a
 * #CalComponentAlarm structure that came from cal_component_get_alarm().  After
 * adding the alarm, the @alarm structure is no longer valid because the
 * internal structures may change and you should get rid of it by using
 * cal_component_alarm_free().
 **/
void
cal_component_add_alarm (CalComponent *comp, CalComponentAlarm *alarm)
{
	CalComponentPrivate *priv;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (alarm != NULL);

	priv = comp->priv;

	add_alarm (comp, alarm->icalcomp, icalproperty_get_x (alarm->uid));
	icalcomponent_add_component (priv->icalcomp, alarm->icalcomp);
}

/**
 * cal_component_remove_alarm:
 * @comp: A calendar component.
 * @auid: UID of the alarm to remove.
 * 
 * Removes an alarm subcomponent from a calendar component.  If the alarm that
 * corresponds to the specified @auid had been fetched with
 * cal_component_get_alarm(), then those alarm structures will be invalid; you
 * should get rid of them with cal_component_alarm_free() before using this
 * function.
 **/
void
cal_component_remove_alarm (CalComponent *comp, const char *auid)
{
	CalComponentPrivate *priv;
	icalcomponent *alarm;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (IS_CAL_COMPONENT (comp));
	g_return_if_fail (auid != NULL);

	priv = comp->priv;
	g_return_if_fail (priv->icalcomp != NULL);

	alarm = g_hash_table_lookup (priv->alarm_uid_hash, auid);
	if (!alarm)
		return;

	g_hash_table_remove (priv->alarm_uid_hash, auid);
	icalcomponent_remove_component (priv->icalcomp, alarm);
	icalcomponent_free (alarm);
}


/* Scans an icalproperty from a calendar component and adds its mapping to our
 * own alarm structure.
 */
static void
scan_alarm_property (CalComponentAlarm *alarm, icalproperty *prop)
{
	icalproperty_kind kind;
	const char *xname;

	kind = icalproperty_isa (prop);

	switch (kind) {
	case ICAL_ACTION_PROPERTY:
		alarm->action = prop;
		break;

	case ICAL_ATTACH_PROPERTY:
		/* FIXME: mail alarms may have any number of these, not just one */
		alarm->attach = prop;
		break;

	case ICAL_DESCRIPTION_PROPERTY:
		alarm->description.prop = prop;
		alarm->description.altrep_param = icalproperty_get_first_parameter (
			prop, ICAL_ALTREP_PARAMETER);
		break;

	case ICAL_DURATION_PROPERTY:
		alarm->duration = prop;
		break;

	case ICAL_REPEAT_PROPERTY:
		alarm->repeat = prop;
		break;

	case ICAL_TRIGGER_PROPERTY:
		alarm->trigger = prop;
		break;

	case ICAL_X_PROPERTY:
		xname = icalproperty_get_x_name (prop);
		g_assert (xname != NULL);

		if (strcmp (xname, EVOLUTION_ALARM_UID_PROPERTY) == 0)
			alarm->uid = prop;

		break;

	default:
		break;
	}
}

/* Creates a CalComponentAlarm from a libical alarm subcomponent */
static CalComponentAlarm *
make_alarm (icalcomponent *subcomp)
{
	CalComponentAlarm *alarm;
	icalproperty *prop;

	alarm = g_new (CalComponentAlarm, 1);

	alarm->icalcomp = subcomp;
	alarm->uid = NULL;

	alarm->action = NULL;
	alarm->attach = NULL;
	alarm->description.prop = NULL;
	alarm->description.altrep_param = NULL;
	alarm->duration = NULL;
	alarm->repeat = NULL;
	alarm->trigger = NULL;

	for (prop = icalcomponent_get_first_property (subcomp, ICAL_ANY_PROPERTY);
	     prop;
	     prop = icalcomponent_get_next_property (subcomp, ICAL_ANY_PROPERTY))
		scan_alarm_property (alarm, prop);

	g_assert (alarm->uid != NULL);

	return alarm;
}

/* Used from g_hash_table_foreach(); adds an alarm UID to a list */
static void
add_alarm_uid (gpointer key, gpointer value, gpointer data)
{
	const char *auid;
	GList **l;

	auid = key;
	l = data;

	*l = g_list_prepend (*l, g_strdup (auid));
}

/**
 * cal_component_get_alarm_uids:
 * @comp: A calendar component.
 *
 * Builds a list of the unique identifiers of the alarm subcomponents inside a
 * calendar component.
 *
 * Return value: List of unique identifiers for alarms.  This should be freed
 * using cal_obj_uid_list_free().
 **/
GList *
cal_component_get_alarm_uids (CalComponent *comp)
{
	CalComponentPrivate *priv;
	GList *l;

	g_return_val_if_fail (comp != NULL, NULL);
	g_return_val_if_fail (IS_CAL_COMPONENT (comp), NULL);

	priv = comp->priv;
	g_return_val_if_fail (priv->icalcomp != NULL, NULL);

	l = NULL;
	g_hash_table_foreach (priv->alarm_uid_hash, add_alarm_uid, &l);

	return l;
}

/**
 * cal_component_get_alarm:
 * @comp: A calendar component.
 * @auid: Unique identifier for the sought alarm subcomponent.
 *
 * Queries a particular alarm subcomponent of a calendar component.
 *
 * Return value: The alarm subcomponent that corresponds to the specified @auid,
 * or #NULL if no alarm exists with that UID.  This should be freed using
 * cal_component_alarm_free().
 **/
CalComponentAlarm *
cal_component_get_alarm (CalComponent *comp, const char *auid)
{
	CalComponentPrivate *priv;
	icalcomponent *alarm;

	g_return_val_if_fail (comp != NULL, NULL);
	g_return_val_if_fail (IS_CAL_COMPONENT (comp), NULL);

	priv = comp->priv;
	g_return_val_if_fail (priv->icalcomp != NULL, NULL);

	g_return_val_if_fail (auid != NULL, NULL);

	alarm = g_hash_table_lookup (priv->alarm_uid_hash, auid);

	if (alarm)
		return make_alarm (alarm);
	else
		return NULL;
}

/**
 * cal_component_alarms_free:
 * @alarms: Component alarms structure.
 *
 * Frees a #CalComponentAlarms structure.
 **/
void
cal_component_alarms_free (CalComponentAlarms *alarms)
{
	GSList *l;

	g_return_if_fail (alarms != NULL);

	g_assert (alarms->comp != NULL);
	gtk_object_unref (GTK_OBJECT (alarms->comp));

	for (l = alarms->alarms; l; l = l->next) {
		CalAlarmInstance *instance;

		instance = l->data;
		g_assert (instance != NULL);
		g_free (instance);
	}

	g_slist_free (alarms->alarms);
	g_free (alarms);
}

/**
 * cal_component_alarm_new:
 *
 *
 *
 * Return value: a new alarm component
 **/
CalComponentAlarm *
cal_component_alarm_new (void)
{
	CalComponentAlarm *alarm;
	char *new_auid ;

	alarm = g_new (CalComponentAlarm, 1);

	alarm->icalcomp = icalcomponent_new (ICAL_VALARM_COMPONENT);

	new_auid = cal_component_gen_uid ();
	alarm->uid = icalproperty_new_x (new_auid);
	icalproperty_set_x_name (alarm->uid, EVOLUTION_ALARM_UID_PROPERTY);
	icalcomponent_add_property (alarm->icalcomp, alarm->uid);
	g_free (new_auid);

	alarm->action = NULL;
	alarm->attach = NULL;
	alarm->description.prop = NULL;
	alarm->description.altrep_param = NULL;
	alarm->duration = NULL;
	alarm->repeat = NULL;
	alarm->trigger = NULL;

	return alarm;
}

/**
 * cal_component_alarm_clone:
 * @alarm: An alarm subcomponent.
 * 
 * Creates a new alarm subcomponent by copying the information from another one.
 * 
 * Return value: A newly-created alarm subcomponent with the same values as the
 * original one.  Should be freed with cal_component_alarm_free().
 **/
CalComponentAlarm *
cal_component_alarm_clone (CalComponentAlarm *alarm)
{
	icalcomponent *icalcomp;

	g_return_val_if_fail (alarm != NULL, NULL);

	icalcomp = icalcomponent_new_clone (alarm->icalcomp);
	return make_alarm (icalcomp);
}

/**
 * cal_component_alarm_free:
 * @alarm: A calendar alarm.
 *
 * Frees an alarm structure.
 **/
void
cal_component_alarm_free (CalComponentAlarm *alarm)
{
	g_return_if_fail (alarm != NULL);

	g_assert (alarm->icalcomp != NULL);

	if (icalcomponent_get_parent (alarm->icalcomp) == NULL)
		icalcomponent_free (alarm->icalcomp);

	alarm->icalcomp = NULL;
	alarm->uid = NULL;
	alarm->action = NULL;
	alarm->attach = NULL;
	alarm->description.prop = NULL;
	alarm->description.altrep_param = NULL;
	alarm->duration = NULL;
	alarm->repeat = NULL;
	alarm->trigger = NULL;

	g_free (alarm);
}

/**
 * cal_component_alarm_get_uid:
 * @alarm: An alarm subcomponent.
 *
 * Queries the unique identifier of an alarm subcomponent.
 *
 * Return value: UID of the alarm.
 **/
const char *
cal_component_alarm_get_uid (CalComponentAlarm *alarm)
{
	g_return_val_if_fail (alarm != NULL, NULL);

	return alarm_uid_from_prop (alarm->uid);
}

/**
 * cal_component_alarm_get_action:
 * @alarm: An alarm.
 * @action: Return value for the alarm's action type.
 *
 * Queries the action type of an alarm.
 **/
void
cal_component_alarm_get_action (CalComponentAlarm *alarm, CalAlarmAction *action)
{
	enum icalproperty_action ipa;

	g_return_if_fail (alarm != NULL);
	g_return_if_fail (action != NULL);

	g_assert (alarm->icalcomp != NULL);

	if (!alarm->action) {
		*action = CAL_ALARM_NONE;
		return;
	}

	ipa = icalproperty_get_action (alarm->action);

	switch (ipa) {
	case ICAL_ACTION_AUDIO:
		*action = CAL_ALARM_AUDIO;
		break;

	case ICAL_ACTION_DISPLAY:
		*action = CAL_ALARM_DISPLAY;
		break;

	case ICAL_ACTION_EMAIL:
		*action = CAL_ALARM_EMAIL;
		break;

	case ICAL_ACTION_PROCEDURE:
		*action = CAL_ALARM_PROCEDURE;
		break;

	case ICAL_ACTION_NONE:
		*action = CAL_ALARM_NONE;
		break;

	default:
		*action = CAL_ALARM_UNKNOWN;
	}
}

/**
 * cal_component_alarm_set_action:
 * @alarm: An alarm.
 * @action: Action type.
 *
 * Sets the action type for an alarm.
 **/
void
cal_component_alarm_set_action (CalComponentAlarm *alarm, CalAlarmAction action)
{
	enum icalproperty_action ipa;

	g_return_if_fail (alarm != NULL);
	g_return_if_fail (action != CAL_ALARM_NONE);
	g_return_if_fail (action != CAL_ALARM_UNKNOWN);

	g_assert (alarm->icalcomp != NULL);

	switch (action) {
	case CAL_ALARM_AUDIO:
		ipa = ICAL_ACTION_AUDIO;
		break;

	case CAL_ALARM_DISPLAY:
		ipa = ICAL_ACTION_DISPLAY;
		break;

	case CAL_ALARM_EMAIL:
		ipa = ICAL_ACTION_EMAIL;
		break;

	case CAL_ALARM_PROCEDURE:
		ipa = ICAL_ACTION_PROCEDURE;
		break;

	default:
		g_assert_not_reached ();
		ipa = ICAL_ACTION_NONE;
	}

	if (alarm->action)
		icalproperty_set_action (alarm->action, ipa);
	else {
		alarm->action = icalproperty_new_action (ipa);
		icalcomponent_add_property (alarm->icalcomp, alarm->action);
	}
}

/**
 * cal_component_alarm_get_attach:
 * @alarm: An alarm.
 * @attach: Return value for the attachment; should be freed using icalattachtype_free().
 * 
 * Queries the attachment property of an alarm.
 **/
void
cal_component_alarm_get_attach (CalComponentAlarm *alarm, struct icalattachtype **attach)
{
	g_return_if_fail (alarm != NULL);
	g_return_if_fail (attach != NULL);

	g_assert (alarm->icalcomp != NULL);

	if (alarm->attach) {
		*attach = icalattachtype_new ();
		**attach = icalproperty_get_attach (alarm->attach);
		/* FIXME: This is bogus in libical; icalattachtype is supposed
		 * to be refcounted but the property functions return it by
		 * value.
		 */
	} else
		*attach = NULL;
}

/**
 * cal_component_alarm_set_attach:
 * @alarm: An alarm.
 * @attach: Attachment property or NULL to remove an existing property.
 * 
 * Sets the attachment property of an alarm.
 **/
void
cal_component_alarm_set_attach (CalComponentAlarm *alarm, struct icalattachtype *attach)
{
	g_return_if_fail (alarm != NULL);

	g_assert (alarm->icalcomp != NULL);

	if (alarm->attach) {
		icalcomponent_remove_property (alarm->icalcomp, alarm->attach);
		icalproperty_free (alarm->attach);
		alarm->attach = NULL;
	}

	if (attach) {
		alarm->attach = icalproperty_new_attach (*attach);
		icalcomponent_add_property (alarm->icalcomp, alarm->attach);
	}
}

/**
 * cal_component_alarm_get_description:
 * @alarm: An alarm.
 * @description: Return value for the description property and its parameters.
 * 
 * Queries the description property of an alarm.
 **/
void
cal_component_alarm_get_description (CalComponentAlarm *alarm, CalComponentText *description)
{
	g_return_if_fail (alarm != NULL);
	g_return_if_fail (description != NULL);

	g_assert (alarm->icalcomp != NULL);

	if (alarm->description.prop)
		description->value = icalproperty_get_description (alarm->description.prop);
	else
		description->value = NULL;

	if (alarm->description.altrep_param)
		description->altrep = icalparameter_get_altrep (alarm->description.altrep_param);
	else
		description->altrep = NULL;
}

/**
 * cal_component_alarm_set_description:
 * @alarm: An alarm.
 * @description: Description property and its parameters, or NULL for no description.
 * 
 * Sets the description property of an alarm.
 **/
void
cal_component_alarm_set_description (CalComponentAlarm *alarm, CalComponentText *description)
{
	g_return_if_fail (alarm != NULL);

	g_assert (alarm->icalcomp != NULL);

	if (alarm->description.prop) {
		icalcomponent_remove_property (alarm->icalcomp, alarm->description.prop);
		icalproperty_free (alarm->description.prop);

		alarm->description.prop = NULL;
		alarm->description.altrep_param = NULL;
	}

	if (!description)
		return;

	g_return_if_fail (description->value != NULL);

	alarm->description.prop = icalproperty_new_description (description->value);
	icalcomponent_add_property (alarm->icalcomp, alarm->description.prop);

	if (description->altrep) {
		alarm->description.altrep_param = icalparameter_new_altrep (
			(char *) description->altrep);
		icalproperty_add_parameter (alarm->description.prop,
					    alarm->description.altrep_param);
	}
}

/**
 * cal_component_alarm_get_repeat:
 * @alarm: An alarm.
 * @repeat: Return value for the repeat/duration properties.
 * 
 * Queries the repeat/duration properties of an alarm.
 **/
void
cal_component_alarm_get_repeat (CalComponentAlarm *alarm, CalAlarmRepeat *repeat)
{
	g_return_if_fail (alarm != NULL);
	g_return_if_fail (repeat != NULL);

	g_assert (alarm->icalcomp != NULL);

	if (!(alarm->repeat && alarm->duration)) {
		repeat->repetitions = 0;
		memset (&repeat->duration, 0, sizeof (repeat->duration));
		return;
	}

	repeat->repetitions = icalproperty_get_repeat (alarm->repeat);
	repeat->duration = icalproperty_get_duration (alarm->duration);
}

/**
 * cal_component_alarm_set_repeat:
 * @alarm: An alarm.
 * @repeat: Repeat/duration values.  To remove any repetitions from the alarm,
 * set the @repeat.repetitions to 0.
 * 
 * Sets the repeat/duration values for an alarm.
 **/
void
cal_component_alarm_set_repeat (CalComponentAlarm *alarm, CalAlarmRepeat repeat)
{
	g_return_if_fail (alarm != NULL);
	g_return_if_fail (repeat.repetitions >= 0);

	g_assert (alarm->icalcomp != NULL);

	/* Delete old properties */

	if (alarm->repeat) {
		icalcomponent_remove_property (alarm->icalcomp, alarm->repeat);
		icalproperty_free (alarm->repeat);
		alarm->repeat = NULL;
	}

	if (alarm->duration) {
		icalcomponent_remove_property (alarm->icalcomp, alarm->duration);
		icalproperty_free (alarm->duration);
		alarm->duration = NULL;
	}

	/* Set the new properties */

	if (repeat.repetitions == 0)
		return; /* For zero extra repetitions the properties should not exist */

	alarm->repeat = icalproperty_new_repeat (repeat.repetitions);
	icalcomponent_add_property (alarm->icalcomp, alarm->repeat);

	alarm->duration = icalproperty_new_duration (repeat.duration);
	icalcomponent_add_property (alarm->icalcomp, alarm->duration);
}

/**
 * cal_component_alarm_get_trigger:
 * @alarm: An alarm.
 * @trigger: Return value for the trigger time.
 *
 * Queries the trigger time for an alarm.
 **/
void
cal_component_alarm_get_trigger (CalComponentAlarm *alarm, CalAlarmTrigger *trigger)
{
	icalparameter *param;
	struct icaltriggertype t;
	gboolean relative;

	g_return_if_fail (alarm != NULL);
	g_return_if_fail (trigger != NULL);

	g_assert (alarm->icalcomp != NULL);

	if (!alarm->trigger) {
		trigger->type = CAL_ALARM_TRIGGER_NONE;
		return;
	}

	/* Get trigger type */

	param = icalproperty_get_first_parameter (alarm->trigger, ICAL_VALUE_PARAMETER);
	if (param) {
		icalparameter_value value;

		value = icalparameter_get_value (param);

		switch (value) {
		case ICAL_VALUE_DURATION:
			relative = TRUE;
			break;

		case ICAL_VALUE_DATETIME:
			relative = FALSE;
			break;

		default:
			g_message ("cal_component_alarm_get_trigger(): Unknown value for trigger "
				   "value %d; using RELATIVE", value);

			relative = TRUE;
			break;
		}
	} else
		relative = TRUE;

	/* Get trigger value and the RELATED parameter */

	t = icalproperty_get_trigger (alarm->trigger);

	if (relative) {
		trigger->u.rel_duration = t.duration;

		param = icalproperty_get_first_parameter (alarm->trigger, ICAL_RELATED_PARAMETER);
		if (param) {
			icalparameter_related rel;

			rel = icalparameter_get_related (param);

			switch (rel) {
			case ICAL_RELATED_START:
				trigger->type = CAL_ALARM_TRIGGER_RELATIVE_START;
				break;

			case ICAL_RELATED_END:
				trigger->type = CAL_ALARM_TRIGGER_RELATIVE_END;
				break;

			default:
				g_assert_not_reached ();
			}
		} else
			trigger->type = CAL_ALARM_TRIGGER_RELATIVE_START;
	} else {
		trigger->u.abs_time = t.time;
		trigger->type = CAL_ALARM_TRIGGER_ABSOLUTE;
	}
}

/**
 * cal_component_alarm_set_trigger:
 * @alarm: An alarm.
 * @trigger: Trigger time structure.
 *
 * Sets the trigger time of an alarm.
 **/
void
cal_component_alarm_set_trigger (CalComponentAlarm *alarm, CalAlarmTrigger trigger)
{
	struct icaltriggertype t;
	icalparameter *param;
	icalparameter_value value_type;
	icalparameter_related related;

	g_return_if_fail (alarm != NULL);
	g_return_if_fail (trigger.type != CAL_ALARM_TRIGGER_NONE);

	g_assert (alarm->icalcomp != NULL);

	/* Delete old trigger */

	if (alarm->trigger) {
		icalcomponent_remove_property (alarm->icalcomp, alarm->trigger);
		icalproperty_free (alarm->trigger);
		alarm->trigger = NULL;
	}

	/* Set the value */

	related = ICAL_RELATED_START; /* Keep GCC happy */

	t.time = icaltime_null_time ();
	t.duration = icaldurationtype_null_duration ();
	switch (trigger.type) {
	case CAL_ALARM_TRIGGER_RELATIVE_START:
		t.duration = trigger.u.rel_duration;
		value_type = ICAL_VALUE_DURATION;
		related = ICAL_RELATED_START;
		break;

	case CAL_ALARM_TRIGGER_RELATIVE_END:
		t.duration = trigger.u.rel_duration;
		value_type = ICAL_VALUE_DURATION;
		related = ICAL_RELATED_END;
		break;

	case CAL_ALARM_TRIGGER_ABSOLUTE:
		t.time = trigger.u.abs_time;
		value_type = ICAL_VALUE_DATETIME;
		break;

	default:
		g_assert_not_reached ();
		return;
	}

	alarm->trigger = icalproperty_new_trigger (t);
	icalcomponent_add_property (alarm->icalcomp, alarm->trigger);

	/* Value parameters */

	param = icalproperty_get_first_parameter (alarm->trigger, ICAL_VALUE_PARAMETER);
	if (param)
		icalparameter_set_value (param, value_type);
	else {
		param = icalparameter_new_value (value_type);
		icalproperty_add_parameter (alarm->trigger, param);
	}

	/* Related parameter */

	if (trigger.type != CAL_ALARM_TRIGGER_ABSOLUTE) {
		param = icalproperty_get_first_parameter (alarm->trigger, ICAL_RELATED_PARAMETER);

		if (param)
			icalparameter_set_related (param, related);
		else {
			param = icalparameter_new_related (related);
			icalproperty_add_parameter (alarm->trigger, param);
		}
	}
}

/* Returns TRUE if both strings match, i.e. they are both NULL or the
   strings are equal. */
static gboolean
cal_component_strings_match	(const gchar	*string1,
				 const gchar	*string2)
{
	if (string1 == NULL || string2 == NULL)
		return (string1 == string2) ? TRUE : FALSE;

	if (!strcmp (string1, string2))
		return TRUE;

	return FALSE;
}


/**
 * cal_component_event_dates_match:
 * @comp1: A calendar component object.
 * @comp2: A calendar component object.
 *
 * Checks if the DTSTART and DTEND properties of the 2 components match.
 * Note that the events may have different recurrence properties which are not
 * taken into account here.
 *
 * Returns: TRUE if the DTSTART and DTEND properties of the 2 components match.
 **/
gboolean
cal_component_event_dates_match	(CalComponent *comp1,
				 CalComponent *comp2)
{
	CalComponentDateTime comp1_dtstart, comp1_dtend;
	CalComponentDateTime comp2_dtstart, comp2_dtend;

	cal_component_get_dtstart (comp1, &comp1_dtstart);
	cal_component_get_dtend   (comp1, &comp1_dtend);
	cal_component_get_dtstart (comp2, &comp2_dtstart);
	cal_component_get_dtend   (comp2, &comp2_dtend);

	/* If either value is NULL they must both be NULL to match. */
	if (comp1_dtstart.value == NULL || comp2_dtstart.value == NULL) {
		if (comp1_dtstart.value != comp2_dtstart.value)
			return FALSE;
	} else {
		if (icaltime_compare (*comp1_dtstart.value,
				      *comp2_dtstart.value))
			return FALSE;
	}

	if (comp1_dtend.value == NULL || comp2_dtend.value == NULL) {
		if (comp1_dtend.value != comp2_dtend.value)
			return FALSE;
	} else {
		if (icaltime_compare (*comp1_dtend.value,
				      *comp2_dtend.value))
			return FALSE;
	}

	/* Now check the timezones. */
	if (!cal_component_strings_match (comp1_dtstart.tzid,
					  comp2_dtstart.tzid))
		return FALSE;

	if (!cal_component_strings_match (comp1_dtend.tzid,
					  comp2_dtend.tzid))
		return FALSE;

	return TRUE;
}