/**
* Grok the TZID and return an offset in seconds from UTC for this
* date and time.
*/
function _parseTZID($date, $time, $tzid)
{
$vtimezone = $this->_container->findComponentByAttribute('vtimezone', 'TZID', $tzid);
if (!$vtimezone) {
return false;
}
$change_times = array();
foreach ($vtimezone->getComponents() as $o) {
$t = $vtimezone->parseChild($o, $date['year']);
if ($t !== false) {
$change_times[] = $t;
}
}
if (!$change_times) {
return false;
}
sort($change_times);
// Time is arbitrarily based on UTC for comparison.
$t = @gmmktime($time['hour'], $time['minute'], $time['second'], $date['month'], $date['mday'], $date['year']);
if ($t < $change_times[0]['time']) {
return $change_times[0]['from'];
}
for ($i = 0, $n = count($change_times); $i < $n - 1; $i++) {
if ($t >= $change_times[$i]['time'] && $t < $change_times[$i + 1]['time']) {
return $change_times[$i]['to'];
}
}
if ($t >= $change_times[$n - 1]['time']) {
return $change_times[$n - 1]['to'];
}
return false;
}
/**
* Generates the free/busy export.
*
* @return Horde_iCalendar The iCal object.
*/
public function export()
{
/* Create the new iCalendar. */
$vCal = new Horde_iCalendar();
$vCal->setAttribute('PRODID', $this->_backend->getProductId());
$vCal->setAttribute('METHOD', 'PUBLISH');
/* Create the new vFreebusy component. */
$vFb =& Horde_iCalendar::newComponent('vfreebusy', $vCal);
$vFb->setAttribute('ORGANIZER', $this->getOrganizerMail(), $this->getOrganizerName());
$vFb->setAttribute('DTSTAMP', $this->getDateStamp());
$vFb->setAttribute('DTSTART', $this->getStart()->timestamp());
$vFb->setAttribute('DTEND', $this->getEnd()->timestamp());
$url = $this->_backend->getUrl();
if (!empty($url)) {
$vFb->setAttribute('URL', $this->getUrl());
}
/* Add all the busy periods. */
foreach ($this->_resource->listEvents($this->getStart(), $this->getEnd()) as $event) {
$status = $this->_status_map->map($event->getStatus());
$duration = $event->duration();
$extra = $event->getEncodedInformation();
foreach ($event->getBusyTimes($this->getStart(), $this->getEnd()) as $busy) {
$vFb->addBusyPeriod($status, $busy, null, $duration, $extra);
}
}
/* Remove the overlaps. */
$vFb->simplify();
/* Combine and return. */
$vCal->addComponent($vFb);
return $vCal;
}
