<?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) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: BatchStorageAbstract.php 23167 2010-10-19 17:53:31Z mabe $

 */

/**

 * @see Zend_Service_WindowsAzure_Storage

 */

require_once 'Zend/Service/WindowsAzure/Storage.php';

/**

 * @see Zend_Service_WindowsAzure_Credentials_CredentialsAbstract

 */

require_once 'Zend/Service/WindowsAzure/Credentials/CredentialsAbstract.php';

/**

 * @see Zend_Service_WindowsAzure_Exception

 */

require_once 'Zend/Service/WindowsAzure/Exception.php';

/**

 * @see Zend_Service_WindowsAzure_Storage_Batch

 */

require_once 'Zend/Service/WindowsAzure/Storage/Batch.php';

/**

 * @see Zend_Http_Client

 */

require_once 'Zend/Http/Client.php';

/**

 * @see Zend_Http_Response

 */

require_once 'Zend/Http/Response.php';

/**

 * @category   Zend

 * @package    Zend_Service_WindowsAzure

 * @subpackage Storage

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

abstract class Zend_Service_WindowsAzure_Storage_BatchStorageAbstract

    extends Zend_Service_WindowsAzure_Storage

{	

    /**

     * Current batch

     * 

     * @var Zend_Service_WindowsAzure_Storage_Batch

     */

    protected $_currentBatch = null;

    /**

     * Set current batch

     * 

     * @param Zend_Service_WindowsAzure_Storage_Batch $batch Current batch

     * @throws Zend_Service_WindowsAzure_Exception

     */

    public function setCurrentBatch(Zend_Service_WindowsAzure_Storage_Batch $batch = null)

    {

        if ($batch !== null && $this->isInBatch()) {

            throw new Zend_Service_WindowsAzure_Exception('Only one batch can be active at a time.');

        }

        $this->_currentBatch = $batch;

    }

    /**

     * Get current batch

     * 

     * @return Zend_Service_WindowsAzure_Storage_Batch

     */

    public function getCurrentBatch()

    {

        return $this->_currentBatch;

    }

    /**

     * Is there a current batch?

     * 

     * @return boolean

     */

    public function isInBatch()

    {

        return $this->_currentBatch !== null;

    }

    /**

     * Starts a new batch operation set

     * 

     * @return Zend_Service_WindowsAzure_Storage_Batch

     * @throws Zend_Service_WindowsAzure_Exception

     */

    public function startBatch()

    {

        return new Zend_Service_WindowsAzure_Storage_Batch($this, $this->getBaseUrl());

    }

	/**

	 * Perform batch using Zend_Http_Client channel, combining all batch operations into one request

	 *

	 * @param array $operations Operations in batch

	 * @param boolean $forTableStorage Is the request for table storage?

	 * @param boolean $isSingleSelect Is the request a single select statement?

	 * @param string $resourceType Resource type

	 * @param string $requiredPermission Required permission

	 * @return Zend_Http_Response

	 */

	public function performBatch($operations = array(), $forTableStorage = false, $isSingleSelect = false, $resourceType = Zend_Service_WindowsAzure_Storage::RESOURCE_UNKNOWN, $requiredPermission = Zend_Service_WindowsAzure_Credentials_CredentialsAbstract::PERMISSION_READ)

	{

	    // Generate boundaries

	    $batchBoundary = 'batch_' . md5(time() . microtime());

	    $changesetBoundary = 'changeset_' . md5(time() . microtime());

	    // Set headers

	    $headers = array();

		// Add version header

		$headers['x-ms-version'] = $this->_apiVersion;

		// Add dataservice headers

		$headers['DataServiceVersion'] = '1.0;NetFx';

		$headers['MaxDataServiceVersion'] = '1.0;NetFx';

		// Add content-type header

		$headers['Content-Type'] = 'multipart/mixed; boundary=' . $batchBoundary;

		// Set path and query string

		$path           = '/$batch';

		$queryString    = '';

		// Set verb

		$httpVerb = Zend_Http_Client::POST;

		// Generate raw data

    	$rawData = '';

		// Single select?

		if ($isSingleSelect) {

		    $operation = $operations[0];

		    $rawData .= '--' . $batchBoundary . "\n";

            $rawData .= 'Content-Type: application/http' . "\n";

            $rawData .= 'Content-Transfer-Encoding: binary' . "\n\n";

            $rawData .= $operation; 

            $rawData .= '--' . $batchBoundary . '--';

		} else {

    		$rawData .= '--' . $batchBoundary . "\n";

    		$rawData .= 'Content-Type: multipart/mixed; boundary=' . $changesetBoundary . "\n\n";

        		// Add operations

        		foreach ($operations as $operation)

        		{

                    $rawData .= '--' . $changesetBoundary . "\n";

                	$rawData .= 'Content-Type: application/http' . "\n";

                	$rawData .= 'Content-Transfer-Encoding: binary' . "\n\n";

                	$rawData .= $operation;

        		}

        		$rawData .= '--' . $changesetBoundary . '--' . "\n";

    		$rawData .= '--' . $batchBoundary . '--';

		}

		// Generate URL and sign request

		$requestUrl     = $this->_credentials->signRequestUrl($this->getBaseUrl() . $path . $queryString, $resourceType, $requiredPermission);

		$requestHeaders = $this->_credentials->signRequestHeaders($httpVerb, $path, $queryString, $headers, $forTableStorage, $resourceType, $requiredPermission);

		// Prepare request

		$this->_httpClientChannel->resetParameters(true);

		$this->_httpClientChannel->setUri($requestUrl);

		$this->_httpClientChannel->setHeaders($requestHeaders);

		$this->_httpClientChannel->setRawData($rawData);

		// Execute request

		$response = $this->_retryPolicy->execute(

		    array($this->_httpClientChannel, 'request'),

		    array($httpVerb)

		);

		return $response;

	}

}