/**
  * Build JSON response structure for an updated account
  * @param TxttoolsAccount $txttoolsAccount Account to build from
  * @return string Constructed JSON
  * @version 2012100801
  * @since 2011061301
  */
 private function buildResponse(TxttoolsAccount $txttoolsAccount)
 {
     // Copy template down
     $response = $this->responseTemplate;
     $response['accountID'] = $txttoolsAccount->getId();
     $response['username'] = $txttoolsAccount->getUsername();
     $response['description'] = $txttoolsAccount->getDescription();
     $response['creditsUsed'] = $txttoolsAccount->getCreditsUsed();
     $response['creditsRemaining'] = $txttoolsAccount->getCreditsRemaining();
     $response['updateTimeString'] = $txttoolsAccount->getLastUpdateFormatted();
     $response['allowOutbound'] = $txttoolsAccount->isOutboundEnabled() ? 1 : 0;
     $response['allowInbound'] = $txttoolsAccount->isInboundEnabled() ? 1 : 0;
     $response['billingType'] = $txttoolsAccount->getBillingType();
     // Include account restrictions if specified
     foreach ($txttoolsAccount->getAllowedUsers() as $allowedUser) {
         $response['allowedUsers'][$allowedUser->getId()] = array('firstName' => $allowedUser->getFirstName(), 'lastName' => $allowedUser->getLastName(), 'username' => $allowedUser->getUsername());
     }
     // Include inbound filters if specified
     foreach ($txttoolsAccount->getInboundFilters() as $inboundFilter) {
         $response['inboundFilters'][$inboundFilter->getId()] = array('type' => $inboundFilter->getFilterType(), 'operand' => (string) $inboundFilter->getOperand(), 'inboxes' => array());
         foreach ($inboundFilter->getDestinationUsers() as $biteSizedUser) {
             // No I'm not kidding. Fortunately these won't be included often
             $response['inboundFilters'][$inboundFilter->getId()]['users'][$biteSizedUser->getId()] = array('firstName' => $biteSizedUser->getFirstName(), 'lastName' => $biteSizedUser->getLastName(), 'username' => $biteSizedUser->getUsername());
         }
     }
     return json_encode($response);
 }