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/* Evolution calendar - Utilities for manipulating CalComponent objects
 *
 * 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 version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU 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.
 */

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

#include "comp-util.h"



/**
 * cal_comp_util_add_exdate:
 * @comp: A calendar component object.
 * @itt: Time for the exception.
 * 
 * Adds an exception date to the current list of EXDATE properties in a calendar
 * component object.
 **/
void
cal_comp_util_add_exdate (CalComponent *comp, time_t t, icaltimezone *zone)
{
    GSList *list;
    CalComponentDateTime *cdt;

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

    cal_component_get_exdate_list (comp, &list);

    cdt = g_new (CalComponentDateTime, 1);
    cdt->value = g_new (struct icaltimetype, 1);
    *cdt->value = icaltime_from_timet_with_zone (t, FALSE, zone);
    cdt->tzid = g_strdup (icaltimezone_get_tzid (zone));

    list = g_slist_append (list, cdt);
    cal_component_set_exdate_list (comp, list);
    cal_component_free_exdate_list (list);
}



/* Returns TRUE if the TZIDs are equivalent, i.e. both NULL or the same. */
static gboolean
cal_component_compare_tzid (const char *tzid1, const char *tzid2)
{
    gboolean retval = TRUE;

    if (tzid1) {
        if (!tzid2 || strcmp (tzid1, tzid2))
            retval = FALSE;
    } else {
        if (tzid2)
            retval = FALSE;
    }

    return retval;
}

/**
 * cal_comp_util_compare_event_timezones:
 * @comp: A calendar component object.
 * @client: A #CalClient.
 * 
 * Checks if the component uses the given timezone for both the start and
 * the end time, or if the UTC offsets of the start and end times are the same
 * as in the given zone.
 *
 * Returns: TRUE if the component's start and end time are at the same UTC
 * offset in the given timezone.
 **/
gboolean
cal_comp_util_compare_event_timezones (CalComponent *comp,
                       CalClient *client,
                       icaltimezone *zone)
{
    CalClientGetStatus status;
    CalComponentDateTime start_datetime, end_datetime;
    const char *tzid;
    gboolean retval = FALSE;
    icaltimezone *start_zone, *end_zone;
    int offset1, offset2;

    tzid = icaltimezone_get_tzid (zone);

    cal_component_get_dtstart (comp, &start_datetime);
    cal_component_get_dtend (comp, &end_datetime);

    /* If either the DTSTART or the DTEND is a DATE value, we return TRUE.
       Maybe if one was a DATE-TIME we should check that, but that should
       not happen often. */
    if (start_datetime.value->is_date || end_datetime.value->is_date) {
        retval = TRUE;
        goto out;
    }

    /* FIXME: DURATION may be used instead. */
    if (cal_component_compare_tzid (tzid, start_datetime.tzid)
        && cal_component_compare_tzid (tzid, end_datetime.tzid)) {
        /* If both TZIDs are the same as the given zone's TZID, then
           we know the timezones are the same so we return TRUE. */
        retval = TRUE;
    } else {
        /* If the TZIDs differ, we have to compare the UTC offsets
           of the start and end times, using their own timezones and
           the given timezone. */
        status = cal_client_get_timezone (client,
                          start_datetime.tzid,
                          &start_zone);
        if (status != CAL_CLIENT_GET_SUCCESS)
            goto out;

        offset1 = icaltimezone_get_utc_offset (start_zone,
                               start_datetime.value,
                               NULL);
        offset2 = icaltimezone_get_utc_offset (zone,
                               start_datetime.value,
                               NULL);
        if (offset1 == offset2) {
            status = cal_client_get_timezone (client,
                              end_datetime.tzid,
                              &end_zone);
            if (status != CAL_CLIENT_GET_SUCCESS)
                goto out;

            offset1 = icaltimezone_get_utc_offset (end_zone,
                                   end_datetime.value,
                                   NULL);
            offset2 = icaltimezone_get_utc_offset (zone,
                                   end_datetime.value,
                                   NULL);
            if (offset1 == offset2)
                retval = TRUE;
        }
    }

 out:

    cal_component_free_datetime (&start_datetime);
    cal_component_free_datetime (&end_datetime);

    return retval;
}