public function execute(CommandContext $context)
 {
     $id = $context->get('roommateId');
     if (is_null($id)) {
         throw new InvalidArgumentException('Must set roommateId');
     }
     PHPWS_Core::initModClass('hms', 'HMS_Roommate.php');
     $roommate = new HMS_Roommate($id);
     if ($roommate->id == 0) {
         throw new InvalidArgumentException('Invalid roommateId ' . $id);
     }
     $username = UserStatus::getUsername();
     if ($username != $roommate->requestee) {
         PHPWS_Core::initModClass('hms', 'exception/PermissionException.php');
         throw new PermissionException("{$username} tried to confirm roommate pairing {$roommate->id}");
     }
     $err = CommandFactory::getCommand('ShowRoommateConfirmAccept');
     $err->setRoommateId($id);
     PHPWS_Core::initCoreClass('Captcha.php');
     $verified = Captcha::verify(TRUE);
     if ($verified === FALSE || is_null($verified)) {
         NQ::Simple('hms', hms\NotificationView::ERROR, 'Sorry, please try again.');
         $err->redirect();
     }
     try {
         $roommate->confirm();
     } catch (RoommateCompatibilityException $rce) {
         NQ::simple('hms', hms\NotificationView::WARNING, $rce->getMessage());
         $err->redirect();
     }
     $roommate->save();
     HMS_Activity_Log::log_activity($roommate->requestor, ACTIVITY_ACCEPTED_AS_ROOMMATE, $roommate->requestee, "{$roommate->requestee} accepted request, CAPTCHA: {$verified}");
     HMS_Activity_Log::log_activity($roommate->requestee, ACTIVITY_ACCEPTED_AS_ROOMMATE, $roommate->requestor, "{$roommate->requestee} accepted request, CAPTCHA: {$verified}");
     // Email both parties
     PHPWS_Core::initModClass('hms', 'HMS_Email.php');
     HMS_Email::send_confirm_emails($roommate);
     // Remove any other requests for the requestor
     HMS_Roommate::removeOutstandingRequests($roommate->requestor, $roommate->term);
     // Remove any other requests for the requestee
     HMS_Roommate::removeOutstandingRequests($roommate->requestee, $roommate->term);
     $requestor = StudentFactory::getStudentByUsername($roommate->requestor, $roommate->term);
     $name = $requestor->getFullName();
     NQ::Simple('hms', hms\NotificationView::SUCCESS, "You and {$name} are confirmed as roommates.");
     $cmd = CommandFactory::getCommand('ShowStudentMenu');
     $cmd->redirect();
 }