<?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 Diagnostics

 * @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    $Id$

 */

/**

 * @see Zend_Service_WindowsAzure_Storage_Blob

 */

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

/**

 * @see Zend_Service_WindowsAzure_Diagnostics_Exception

 */

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

/**

 * @see Zend_Service_WindowsAzure_Diagnostics_ConfigurationInstance

 */

require_once 'Zend/Service/WindowsAzure/Diagnostics/ConfigurationInstance.php';

/**

 * @category   Zend

 * @package    Zend_Service_WindowsAzure

 * @subpackage Diagnostics

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

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

 */

class Zend_Service_WindowsAzure_Diagnostics_Manager

{

	/**

	 * Blob storage client

	 * 

	 * @var Zend_Service_WindowsAzure_Storage_Blob

	 */

	protected $_blobStorageClient = null;

	/**

	 * Control container name

	 * 

	 * @var string

	 */

	protected $_controlContainer = '';

	/**

	 * Create a new instance of Zend_Service_WindowsAzure_Diagnostics_Manager

	 * 

	 * @param Zend_Service_WindowsAzure_Storage_Blob $blobStorageClient Blob storage client

	 * @param string $controlContainer Control container name

	 */

	public function __construct(Zend_Service_WindowsAzure_Storage_Blob $blobStorageClient = null, $controlContainer = 'wad-control-container')

	{

		$this->_blobStorageClient = $blobStorageClient;

		$this->_controlContainer = $controlContainer;

		$this->_ensureStorageInitialized();

	}

	/**

	 * Ensure storage has been initialized

	 */

	protected function _ensureStorageInitialized()

	{

		if (!$this->_blobStorageClient->containerExists($this->_controlContainer)) {

			$this->_blobStorageClient->createContainer($this->_controlContainer);

		}

	}

	/**

	 * Get default configuration values

	 * 

	 * @return Zend_Service_WindowsAzure_Diagnostics_ConfigurationInstance

	 */

	public function getDefaultConfiguration()

	{

		return new Zend_Service_WindowsAzure_Diagnostics_ConfigurationInstance();

	}

	/**

	 * Checks if a configuration for a specific role instance exists.

	 * 

	 * @param string $roleInstance Role instance name, can be found in $_SERVER['RdRoleId'] when hosted on Windows Azure.

	 * @return boolean

	 * @throws Zend_Service_WindowsAzure_Diagnostics_Exception

	 */

	public function configurationForRoleInstanceExists($roleInstance = null)

	{

		if ($roleInstance === null) {

			throw new Zend_Service_WindowsAzure_Diagnostics_Exception('Role instance should be specified. Try reading $_SERVER[\'RdRoleId\'] for this information if the application is hosted on Windows Azure Fabric or Development Fabric.');

		}

		return $this->_blobStorageClient->blobExists($this->_controlContainer, $roleInstance);

	}

	/**

	 * Checks if a configuration for current role instance exists. Only works on Development Fabric or Windows Azure Fabric.

	 * 

	 * @return boolean

	 * @throws Zend_Service_WindowsAzure_Diagnostics_Exception

	 */

	public function configurationForCurrentRoleInstanceExists()

	{

		if (!isset($_SERVER['RdRoleId'])) {

			throw new Zend_Service_WindowsAzure_Diagnostics_Exception('Server variable \'RdRoleId\' is unknown. Please verify the application is running in Development Fabric or Windows Azure Fabric.');

		}

		return $this->_blobStorageClient->blobExists($this->_controlContainer, $_SERVER['RdRoleId']);

	}

	/**

	 * Get configuration for current role instance. Only works on Development Fabric or Windows Azure Fabric.

	 * 

	 * @return Zend_Service_WindowsAzure_Diagnostics_ConfigurationInstance

	 * @throws Zend_Service_WindowsAzure_Diagnostics_Exception

	 */

	public function getConfigurationForCurrentRoleInstance()

	{

		if (!isset($_SERVER['RdRoleId'])) {

			throw new Zend_Service_WindowsAzure_Diagnostics_Exception('Server variable \'RdRoleId\' is unknown. Please verify the application is running in Development Fabric or Windows Azure Fabric.');

		}

		return $this->getConfigurationForRoleInstance($_SERVER['RdRoleId']);

	}

	/**

	 * Set configuration for current role instance. Only works on Development Fabric or Windows Azure Fabric.

	 * 

	 * @param Zend_Service_WindowsAzure_Diagnostics_ConfigurationInstance $configuration Configuration to apply

	 * @throws Zend_Service_WindowsAzure_Diagnostics_Exception

	 */

	public function setConfigurationForCurrentRoleInstance(Zend_Service_WindowsAzure_Diagnostics_ConfigurationInstance $configuration)

	{

		if (!isset($_SERVER['RdRoleId'])) {

			throw new Zend_Service_WindowsAzure_Diagnostics_Exception('Server variable \'RdRoleId\' is unknown. Please verify the application is running in Development Fabric or Windows Azure Fabric.');

		}

		$this->setConfigurationForRoleInstance($_SERVER['RdRoleId'], $configuration);

	}

	/**

	 * Get configuration for a specific role instance

	 * 

	 * @param string $roleInstance Role instance name, can be found in $_SERVER['RdRoleId'] when hosted on Windows Azure.

	 * @return Zend_Service_WindowsAzure_Diagnostics_ConfigurationInstance

	 * @throws Zend_Service_WindowsAzure_Diagnostics_Exception

	 */

	public function getConfigurationForRoleInstance($roleInstance = null)

	{

		if ($roleInstance === null) {

			throw new Zend_Service_WindowsAzure_Diagnostics_Exception('Role instance should be specified. Try reading $_SERVER[\'RdRoleId\'] for this information if the application is hosted on Windows Azure Fabric or Development Fabric.');

		}

		if ($this->_blobStorageClient->blobExists($this->_controlContainer, $roleInstance)) {

			$configurationInstance = new Zend_Service_WindowsAzure_Diagnostics_ConfigurationInstance();

			$configurationInstance->loadXml( $this->_blobStorageClient->getBlobData($this->_controlContainer, $roleInstance) );

			return $configurationInstance;

		}

		return new Zend_Service_WindowsAzure_Diagnostics_ConfigurationInstance();

	}

	/**

	 * Set configuration for a specific role instance

	 * 

	 * @param string $roleInstance Role instance name, can be found in $_SERVER['RdRoleId'] when hosted on Windows Azure.

	 * @param Zend_Service_WindowsAzure_Diagnostics_ConfigurationInstance $configuration Configuration to apply

	 * @throws Zend_Service_WindowsAzure_Diagnostics_Exception

	 */

	public function setConfigurationForRoleInstance($roleInstance = null, Zend_Service_WindowsAzure_Diagnostics_ConfigurationInstance $configuration)

	{

		if ($roleInstance === null) {

			throw new Zend_Service_WindowsAzure_Diagnostics_Exception('Role instance should be specified. Try reading $_SERVER[\'RdRoleId\'] for this information if the application is hosted on Windows Azure Fabric or Development Fabric.');

		}

		$this->_blobStorageClient->putBlobData($this->_controlContainer, $roleInstance, $configuration->toXml(), array(), null, array('Content-Type' => 'text/xml'));

	}

}