/**
 * Send an iMIP message since they look like a non-local user.
 *  
 * @param string $method The METHOD parameter from the iTIP
 * @param string $to_email The e-mail address we're going to send to
 * @param vCalendar $vcal The iTIP part of the message.
 */
function doImipMessage($method, $to_email, vCalendar $itip)
{
    global $c, $request;
    header('Debug: Sending iMIP ' . $method . ' message to ' . $to_email);
    $mime = new MultiPart();
    $mime->addPart($itip->Render(), 'text/calendar; charset=UTF-8; method=' . $method);
    $friendly_part = isset($c->iMIP->template[$method]) ? $c->iMIP->template[$method] : <<<EOTEMPLATE
This is a meeting ##METHOD## which your e-mail program should be able to
import into your calendar.  Alternatively you could save the attachment
and load that into your calendar instead.
EOTEMPLATE;
    $components = $itip->GetComponents('VTIMEZONE', false);
    $replaceable = array('METHOD', 'DTSTART', 'DTEND', 'SUMMARY', 'DESCRIPTION', 'URL');
    foreach ($replaceable as $pname) {
        $search = '##' . $pname . '##';
        if (strstr($friendly_part, $search) !== false) {
            $property = $itip->GetProperty($pname);
            if (empty($property)) {
                $property = $components[0]->GetProperty($pname);
            }
            if (empty($property)) {
                $replace = '';
            } else {
                switch ($pname) {
                    case 'DTSTART':
                    case 'DTEND':
                        $when = new RepeatRuleDateTime($property);
                        $replace = $when->format('c');
                        break;
                    default:
                        $replace = $property->GetValue();
                }
            }
            $friendly_part = str_replace($search, $replace, $friendly_part);
        }
    }
    $mime->addPart($friendly_part, 'text/plain');
    $email = new EMail();
    $email->SetFrom($request->principal->email());
    $email->AddTo($to_email);
    $email->SetSubject($components[0]->GetPValue('SUMMARY'));
    $email->SetBody($mime->getMimeParts());
    if (isset($c->iMIP->pretend_email)) {
        $email->Pretend($mime->getMimeHeaders());
    } else {
        if (!isset($c->iMIP->send_email) || !$c->iMIP->send_email) {
            $email->PretendLog($mime->getMimeHeaders());
        } else {
            $email->Send($mime->getMimeHeaders());
        }
    }
}