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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Service_WindowsAzure
  * @subpackage Storage
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://todo     name_todo
  * @version    $Id$
  */
 
 /**
  * see Zend_Service_WindowsAzure_Storage
  */
 // require_once 'Zend/Service/WindowsAzure/Storage.php';
 
 /**
  * @see Zend_Service_WindowsAzure_Storage_QueueInstance
  */
 // require_once 'Zend/Service/WindowsAzure/Storage/QueueInstance.php';
 
 /**
  * @see Zend_Service_WindowsAzure_Storage_QueueMessage
  */
 // require_once 'Zend/Service/WindowsAzure/Storage/QueueMessage.php';
 
 /**
  * @category   Zend
  * @package    Zend_Service_WindowsAzure
  * @subpackage Storage
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Service_WindowsAzure_Storage_Queue extends Zend_Service_WindowsAzure_Storage
 {
   /**
    * Maximal message size (in bytes)
    */
   const MAX_MESSAGE_SIZE = 8388608;
   
   /**
    * Maximal message ttl (in seconds)
    */
   const MAX_MESSAGE_TTL = 604800;
   
   /**
    * Creates a new Zend_Service_WindowsAzure_Storage_Queue instance
    *
    * @param string $host Storage host name
    * @param string $accountName Account name for Windows Azure
    * @param string $accountKey Account key for Windows Azure
    * @param boolean $usePathStyleUri Use path-style URI's
    * @param Zend_Service_WindowsAzure_RetryPolicy_RetryPolicyAbstract $retryPolicy Retry policy to use when making requests
    */
   public function __construct($host = Zend_Service_WindowsAzure_Storage::URL_DEV_QUEUE, $accountName = Zend_Service_WindowsAzure_Credentials_CredentialsAbstract::DEVSTORE_ACCOUNT, $accountKey = Zend_Service_WindowsAzure_Credentials_CredentialsAbstract::DEVSTORE_KEY, $usePathStyleUri = false, Zend_Service_WindowsAzure_RetryPolicy_RetryPolicyAbstract $retryPolicy = null)
   {
     parent::__construct($host, $accountName, $accountKey, $usePathStyleUri, $retryPolicy);
     
     // API version
     $this->_apiVersion = '2009-09-19';
   }
   
   /**
    * Check if a queue exists
    * 
    * @param string $queueName Queue name
    * @return boolean
    */
   public function queueExists($queueName = '')
   {
     if ($queueName === '') {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception('Queue name is not specified.');
     }
     if (!self::isValidQueueName($queueName)) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('Queue name does not adhere to queue naming conventions. See http://msdn.microsoft.com/en-us/library/dd179349.aspx for more information.');
     }
       
     // List queues
         $queues = $this->listQueues($queueName, 1);
         foreach ($queues as $queue) {
             if ($queue->Name == $queueName) {
                 return true;
             }
         }
         
         return false;
   }
   
   /**
    * Create queue
    *
    * @param string $queueName Queue name
    * @param array  $metadata  Key/value pairs of meta data
    * @return object Queue properties
    * @throws Zend_Service_WindowsAzure_Exception
    */
   public function createQueue($queueName = '', $metadata = array())
   {
     if ($queueName === '') {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception('Queue name is not specified.');
     }
     if (!self::isValidQueueName($queueName)) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('Queue name does not adhere to queue naming conventions. See http://msdn.microsoft.com/en-us/library/dd179349.aspx for more information.');
     }
       
     // Create metadata headers
     $headers = array();
     $headers = array_merge($headers, $this->_generateMetadataHeaders($metadata)); 
     
     // Perform request
     $response = $this->_performRequest($queueName, '', Zend_Http_Client::PUT, $headers);  
     if ($response->isSuccessful()) {
       
         return new Zend_Service_WindowsAzure_Storage_QueueInstance(
             $queueName,
             $metadata
         );
     } else {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception($this->_getErrorMessage($response, 'Resource could not be accessed.'));
     }
   }
   
   /**
    * Create queue if it does not exist
    *
    * @param string $queueName Queue name
    * @param array  $metadata  Key/value pairs of meta data
    * @throws Zend_Service_WindowsAzure_Exception
    */
   public function createQueueIfNotExists($queueName = '', $metadata = array())
   {
     if (!$this->queueExists($queueName)) {
       $this->createQueue($queueName, $metadata);
     }
   }
   
   /**
    * Get queue
    * 
    * @param string $queueName  Queue name
    * @return Zend_Service_WindowsAzure_Storage_QueueInstance
    * @throws Zend_Service_WindowsAzure_Exception
    */
   public function getQueue($queueName = '')
   {
     if ($queueName === '') {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception('Queue name is not specified.');
     }
     if (!self::isValidQueueName($queueName)) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('Queue name does not adhere to queue naming conventions. See http://msdn.microsoft.com/en-us/library/dd179349.aspx for more information.');
     }
         
     // Perform request
     $response = $this->_performRequest($queueName, '?comp=metadata', Zend_Http_Client::GET);  
     if ($response->isSuccessful()) {
         // Parse metadata
         $metadata = $this->_parseMetadataHeaders($response->getHeaders());
       
         // Return queue
         $queue = new Zend_Service_WindowsAzure_Storage_QueueInstance(
             $queueName,
             $metadata
         );
         $queue->ApproximateMessageCount = intval($response->getHeader('x-ms-approximate-message-count'));
         return $queue;
     } else {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception($this->_getErrorMessage($response, 'Resource could not be accessed.'));
     }
   }
   
   /**
    * Get queue metadata
    * 
    * @param string $queueName  Queue name
    * @return array Key/value pairs of meta data
    * @throws Zend_Service_WindowsAzure_Exception
    */
   public function getQueueMetadata($queueName = '')
   {
     if ($queueName === '') {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception('Queue name is not specified.');
     }
     if (!self::isValidQueueName($queueName)) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('Queue name does not adhere to queue naming conventions. See http://msdn.microsoft.com/en-us/library/dd179349.aspx for more information.');
     }
       
       return $this->getQueue($queueName)->Metadata;
   }
   
   /**
    * Set queue metadata
    * 
    * Calling the Set Queue Metadata operation overwrites all existing metadata that is associated with the queue. It's not possible to modify an individual name/value pair.
    *
    * @param string $queueName  Queue name
    * @param array  $metadata       Key/value pairs of meta data
    * @throws Zend_Service_WindowsAzure_Exception
    */
   public function setQueueMetadata($queueName = '', $metadata = array())
   {
     if ($queueName === '') {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception('Queue name is not specified.');
     }
     if (!self::isValidQueueName($queueName)) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('Queue name does not adhere to queue naming conventions. See http://msdn.microsoft.com/en-us/library/dd179349.aspx for more information.');
     }
     if (count($metadata) == 0) {
         return;
     }
         
     // Create metadata headers
     $headers = array();
     $headers = array_merge($headers, $this->_generateMetadataHeaders($metadata)); 
     
     // Perform request
     $response = $this->_performRequest($queueName, '?comp=metadata', Zend_Http_Client::PUT, $headers);
 
     if (!$response->isSuccessful()) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception($this->_getErrorMessage($response, 'Resource could not be accessed.'));
     }
   }
   
   /**
    * Delete queue
    *
    * @param string $queueName Queue name
    * @throws Zend_Service_WindowsAzure_Exception
    */
   public function deleteQueue($queueName = '')
   {
     if ($queueName === '') {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception('Queue name is not specified.');
     }
     if (!self::isValidQueueName($queueName)) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('Queue name does not adhere to queue naming conventions. See http://msdn.microsoft.com/en-us/library/dd179349.aspx for more information.');
     }
       
     // Perform request
     $response = $this->_performRequest($queueName, '', Zend_Http_Client::DELETE);
     if (!$response->isSuccessful()) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception($this->_getErrorMessage($response, 'Resource could not be accessed.'));
     }
   }
   
   /**
    * List queues
    *
    * @param string $prefix     Optional. Filters the results to return only queues whose name begins with the specified prefix.
    * @param int    $maxResults Optional. Specifies the maximum number of queues to return per call to Azure storage. This does NOT affect list size returned by this function. (maximum: 5000)
    * @param string $marker     Optional string value that identifies the portion of the list to be returned with the next list operation.
    * @param string $include    Optional. Include this parameter to specify that the queue's metadata be returned as part of the response body. (allowed values: '', 'metadata')
    * @param int    $currentResultCount Current result count (internal use)
    * @return array
    * @throws Zend_Service_WindowsAzure_Exception
    */
   public function listQueues($prefix = null, $maxResults = null, $marker = null, $include = null, $currentResultCount = 0)
   {
       // Build query string
     $queryString = array('comp=list');
         if (!is_null($prefix)) {
           $queryString[] = 'prefix=' . $prefix;
         }
       if (!is_null($maxResults)) {
           $queryString[] = 'maxresults=' . $maxResults;
       }
       if (!is_null($marker)) {
           $queryString[] = 'marker=' . $marker;
       }
     if (!is_null($include)) {
           $queryString[] = 'include=' . $include;
       }
       $queryString = self::createQueryStringFromArray($queryString);
           
     // Perform request
     $response = $this->_performRequest('', $queryString, Zend_Http_Client::GET);  
     if ($response->isSuccessful()) {
       $xmlQueues = $this->_parseResponse($response)->Queues->Queue;
       $xmlMarker = (string)$this->_parseResponse($response)->NextMarker;
 
       $queues = array();
       if (!is_null($xmlQueues)) {
         
         for ($i = 0; $i < count($xmlQueues); $i++) {
           $queues[] = new Zend_Service_WindowsAzure_Storage_QueueInstance(
             (string)$xmlQueues[$i]->Name,
             $this->_parseMetadataElement($xmlQueues[$i])
           );
         }
       }
       $currentResultCount = $currentResultCount + count($queues);
       if (!is_null($maxResults) && $currentResultCount < $maxResults) {
           if (!is_null($xmlMarker) && $xmlMarker != '') {
               $queues = array_merge($queues, $this->listQueues($prefix, $maxResults, $xmlMarker, $include, $currentResultCount));
           }
       }
       if (!is_null($maxResults) && count($queues) > $maxResults) {
           $queues = array_slice($queues, 0, $maxResults);
       }
           
       return $queues;
     } else {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception($this->_getErrorMessage($response, 'Resource could not be accessed.'));
     }
   }
   
   /**
    * Put message into queue
    *
    * @param string $queueName  Queue name
    * @param string $message    Message
    * @param int    $ttl        Message Time-To-Live (in seconds). Defaults to 7 days if the parameter is omitted.
    * @throws Zend_Service_WindowsAzure_Exception
    */
   public function putMessage($queueName = '', $message = '', $ttl = null)
   {
     if ($queueName === '') {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception('Queue name is not specified.');
     }
     if (!self::isValidQueueName($queueName)) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('Queue name does not adhere to queue naming conventions. See http://msdn.microsoft.com/en-us/library/dd179349.aspx for more information.');
     }
     if (strlen($message) > self::MAX_MESSAGE_SIZE) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('Message is too big. Message content should be < 8KB.');
     }
     if ($message == '') {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('Message is not specified.');
     }
     if (!is_null($ttl) && ($ttl <= 0 || $ttl > self::MAX_MESSAGE_SIZE)) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('Message TTL is invalid. Maximal TTL is 7 days (' . self::MAX_MESSAGE_SIZE . ' seconds) and should be greater than zero.');
     }
         
       // Build query string
     $queryString = array();
         if (!is_null($ttl)) {
           $queryString[] = 'messagettl=' . $ttl;
         }
       $queryString = self::createQueryStringFromArray($queryString);
           
       // Build body
       $rawData = '';
       $rawData .= '<QueueMessage>';
       $rawData .= '    <MessageText>' . base64_encode($message) . '</MessageText>';
       $rawData .= '</QueueMessage>';
           
     // Perform request
     $response = $this->_performRequest($queueName . '/messages', $queryString, Zend_Http_Client::POST, array(), false, $rawData);
 
     if (!$response->isSuccessful()) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception('Error putting message into queue.');
     }
   }
   
   /**
    * Get queue messages
    *
    * @param string $queueName         Queue name
    * @param string $numOfMessages     Optional. A nonzero integer value that specifies the number of messages to retrieve from the queue, up to a maximum of 32. By default, a single message is retrieved from the queue with this operation.
    * @param int    $visibilityTimeout Optional. An integer value that specifies the message's visibility timeout in seconds. The maximum value is 2 hours. The default message visibility timeout is 30 seconds.
    * @param string $peek              Peek only?
    * @return array
    * @throws Zend_Service_WindowsAzure_Exception
    */
   public function getMessages($queueName = '', $numOfMessages = 1, $visibilityTimeout = null, $peek = false)
   {
     if ($queueName === '') {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception('Queue name is not specified.');
     }
     if (!self::isValidQueueName($queueName)) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('Queue name does not adhere to queue naming conventions. See http://msdn.microsoft.com/en-us/library/dd179349.aspx for more information.');
     }
     if ($numOfMessages < 1 || $numOfMessages > 32 || intval($numOfMessages) != $numOfMessages) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('Invalid number of messages to retrieve.');
     }
     if (!is_null($visibilityTimeout) && ($visibilityTimeout <= 0 || $visibilityTimeout > 7200)) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('Visibility timeout is invalid. Maximum value is 2 hours (7200 seconds) and should be greater than zero.');
     }
         
       // Build query string
     $queryString = array();
       if ($peek) {
           $queryString[] = 'peekonly=true';
       }
       if ($numOfMessages > 1) {
           $queryString[] = 'numofmessages=' . $numOfMessages;
       }
       if (!$peek && !is_null($visibilityTimeout)) {
           $queryString[] = 'visibilitytimeout=' . $visibilityTimeout;
       }   
       $queryString = self::createQueryStringFromArray($queryString);
           
     // Perform request
     $response = $this->_performRequest($queueName . '/messages', $queryString, Zend_Http_Client::GET);  
     if ($response->isSuccessful()) {
         // Parse results
       $result = $this->_parseResponse($response);
         if (!$result) {
             return array();
         }
 
         $xmlMessages = null;
         if (count($result->QueueMessage) > 1) {
             $xmlMessages = $result->QueueMessage;
         } else {
             $xmlMessages = array($result->QueueMessage);
         }
       
       $messages = array();
       for ($i = 0; $i < count($xmlMessages); $i++) {
         $messages[] = new Zend_Service_WindowsAzure_Storage_QueueMessage(
           (string)$xmlMessages[$i]->MessageId,
           (string)$xmlMessages[$i]->InsertionTime,
           (string)$xmlMessages[$i]->ExpirationTime,
           ($peek ? '' : (string)$xmlMessages[$i]->PopReceipt),
           ($peek ? '' : (string)$xmlMessages[$i]->TimeNextVisible),
           (string)$xmlMessages[$i]->DequeueCount,
           base64_decode((string)$xmlMessages[$i]->MessageText)
           );
       }
           
       return $messages;
     } else {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception($this->_getErrorMessage($response, 'Resource could not be accessed.'));
     }
   }
   
   /**
    * Peek queue messages
    *
    * @param string $queueName         Queue name
    * @param string $numOfMessages     Optional. A nonzero integer value that specifies the number of messages to retrieve from the queue, up to a maximum of 32. By default, a single message is retrieved from the queue with this operation.
    * @return array
    * @throws Zend_Service_WindowsAzure_Exception
    */
   public function peekMessages($queueName = '', $numOfMessages = 1)
   {
       return $this->getMessages($queueName, $numOfMessages, null, true);
   }
   
   /**
    * Checks to see if a given queue has messages
    *
    * @param string $queueName         Queue name
    * @return boolean
    * @throws Zend_Service_WindowsAzure_Exception
    */
   public function hasMessages($queueName = '')
   {
     return count($this->peekMessages($queueName)) > 0;
   }
   
   /**
    * Clear queue messages
    *
    * @param string $queueName         Queue name
    * @throws Zend_Service_WindowsAzure_Exception
    */
   public function clearMessages($queueName = '')
   {
     if ($queueName === '') {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception('Queue name is not specified.');
     }
     if (!self::isValidQueueName($queueName)) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('Queue name does not adhere to queue naming conventions. See http://msdn.microsoft.com/en-us/library/dd179349.aspx for more information.');
     }
 
     // Perform request
     $response = $this->_performRequest($queueName . '/messages', '', Zend_Http_Client::DELETE); 
     if (!$response->isSuccessful()) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception('Error clearing messages from queue.');
     }
   }
   
   /**
    * Delete queue message
    *
    * @param string $queueName Queue name
    * @param Zend_Service_WindowsAzure_Storage_QueueMessage $message Message to delete from queue. A message retrieved using "peekMessages" can NOT be deleted!
    * @throws Zend_Service_WindowsAzure_Exception
    */
   public function deleteMessage($queueName = '', Zend_Service_WindowsAzure_Storage_QueueMessage $message)
   {
     if ($queueName === '') {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception('Queue name is not specified.');
     }
     if (!self::isValidQueueName($queueName)) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('Queue name does not adhere to queue naming conventions. See http://msdn.microsoft.com/en-us/library/dd179349.aspx for more information.');
     }
     if ($message->PopReceipt == '') {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
         throw new Zend_Service_WindowsAzure_Exception('A message retrieved using "peekMessages" can NOT be deleted! Use "getMessages" instead.');
     }
 
     // Perform request
     $response = $this->_performRequest($queueName . '/messages/' . $message->MessageId, '?popreceipt=' . urlencode($message->PopReceipt), Zend_Http_Client::DELETE);  
     if (!$response->isSuccessful()) {
       // require_once 'Zend/Service/WindowsAzure/Exception.php';
       throw new Zend_Service_WindowsAzure_Exception($this->_getErrorMessage($response, 'Resource could not be accessed.'));
     }
   }
   
   /**
    * Is valid queue name?
    *
    * @param string $queueName Queue name
    * @return boolean
    */
     public static function isValidQueueName($queueName = '')
     {
         if (preg_match("/^[a-z0-9][a-z0-9-]*$/", $queueName) === 0) {
             return false;
         }
     
         if (strpos($queueName, '--') !== false) {
             return false;
         }
     
         if (strtolower($queueName) != $queueName) {
             return false;
         }
     
         if (strlen($queueName) < 3 || strlen($queueName) > 63) {
             return false;
         }
             
         if (substr($queueName, -1) == '-') {
             return false;
         }
     
         return true;
     }
     
   /**
    * Get error message from Zend_Http_Response
    * 
    * @param Zend_Http_Response $response Repsonse
    * @param string $alternativeError Alternative error message
    * @return string
    */
   protected function _getErrorMessage(Zend_Http_Response $response, $alternativeError = 'Unknown error.')
   {
     $response = $this->_parseResponse($response);
     if ($response && $response->Message) {
         return (string)$response->Message;
     } else {
         return $alternativeError;
     }
   }
 }