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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_Controller
  * @subpackage Plugins
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 
 /** Zend_Controller_Plugin_Abstract */
 // require_once 'Zend/Controller/Plugin/Abstract.php';
 
 /** Zend_Registry */
 // require_once 'Zend/Registry.php';
 
 /**
  * Manage a stack of actions
  *
  * @uses       Zend_Controller_Plugin_Abstract
  * @category   Zend
  * @package    Zend_Controller
  * @subpackage Plugins
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 class Zend_Controller_Plugin_ActionStack extends Zend_Controller_Plugin_Abstract
 {
     /** @var Zend_Registry */
     protected $_registry;
 
     /**
      * Registry key under which actions are stored
      * @var string
      */
     protected $_registryKey = 'Zend_Controller_Plugin_ActionStack';
 
     /**
      * Valid keys for stack items
      * @var array
      */
     protected $_validKeys = array(
         'module',
         'controller',
         'action',
         'params'
     );
 
     /**
      * Flag to determine whether request parameters are cleared between actions, or whether new parameters
      * are added to existing request parameters.
      *
      * @var Bool
      */
     protected $_clearRequestParams = false;
 
     /**
      * Constructor
      *
      * @param  Zend_Registry $registry
      * @param  string $key
      * @return void
      */
     public function __construct(Zend_Registry $registry = null, $key = null)
     {
         if (null === $registry) {
             $registry = Zend_Registry::getInstance();
         }
         $this->setRegistry($registry);
 
         if (null !== $key) {
             $this->setRegistryKey($key);
         } else {
             $key = $this->getRegistryKey();
         }
 
         $registry[$key] = array();
     }
 
     /**
      * Set registry object
      *
      * @param  Zend_Registry $registry
      * @return Zend_Controller_Plugin_ActionStack
      */
     public function setRegistry(Zend_Registry $registry)
     {
         $this->_registry = $registry;
         return $this;
     }
 
     /**
      * Retrieve registry object
      *
      * @return Zend_Registry
      */
     public function getRegistry()
     {
         return $this->_registry;
     }
 
     /**
      * Retrieve registry key
      *
      * @return string
      */
     public function getRegistryKey()
     {
         return $this->_registryKey;
     }
 
     /**
      * Set registry key
      *
      * @param  string $key
      * @return Zend_Controller_Plugin_ActionStack
      */
     public function setRegistryKey($key)
     {
         $this->_registryKey = (string) $key;
         return $this;
     }
 
     /**
      *  Set clearRequestParams flag
      *
      *  @param  bool $clearRequestParams
      *  @return Zend_Controller_Plugin_ActionStack
      */
     public function setClearRequestParams($clearRequestParams)
     {
         $this->_clearRequestParams = (bool) $clearRequestParams;
         return $this;
     }
 
     /**
      * Retrieve clearRequestParams flag
      *
      * @return bool
      */
     public function getClearRequestParams()
     {
         return $this->_clearRequestParams;
     }
 
     /**
      * Retrieve action stack
      *
      * @return array
      */
     public function getStack()
     {
         $registry = $this->getRegistry();
         $stack    = $registry[$this->getRegistryKey()];
         return $stack;
     }
 
     /**
      * Save stack to registry
      *
      * @param  array $stack
      * @return Zend_Controller_Plugin_ActionStack
      */
     protected function _saveStack(array $stack)
     {
         $registry = $this->getRegistry();
         $registry[$this->getRegistryKey()] = $stack;
         return $this;
     }
 
     /**
      * Push an item onto the stack
      *
      * @param  Zend_Controller_Request_Abstract $next
      * @return Zend_Controller_Plugin_ActionStack
      */
     public function pushStack(Zend_Controller_Request_Abstract $next)
     {
         $stack = $this->getStack();
         array_push($stack, $next);
         return $this->_saveStack($stack);
     }
 
     /**
      * Pop an item off the action stack
      *
      * @return false|Zend_Controller_Request_Abstract
      */
     public function popStack()
     {
         $stack = $this->getStack();
         if (0 == count($stack)) {
             return false;
         }
 
         $next = array_pop($stack);
         $this->_saveStack($stack);
 
         if (!$next instanceof Zend_Controller_Request_Abstract) {
             // require_once 'Zend/Controller/Exception.php';
             throw new Zend_Controller_Exception('ArrayStack should only contain request objects');
         }
         $action = $next->getActionName();
         if (empty($action)) {
             return $this->popStack($stack);
         }
 
         $request    = $this->getRequest();
         $controller = $next->getControllerName();
         if (empty($controller)) {
             $next->setControllerName($request->getControllerName());
         }
 
         $module = $next->getModuleName();
         if (empty($module)) {
             $next->setModuleName($request->getModuleName());
         }
 
         return $next;
     }
 
     /**
      * postDispatch() plugin hook -- check for actions in stack, and dispatch if any found
      *
      * @param  Zend_Controller_Request_Abstract $request
      * @return void
      */
     public function postDispatch(Zend_Controller_Request_Abstract $request)
     {
         // Don't move on to next request if this is already an attempt to
         // forward
         if (!$request->isDispatched()) {
             return;
         }
 
         $this->setRequest($request);
         $stack = $this->getStack();
         if (empty($stack)) {
             return;
         }
         $next = $this->popStack();
         if (!$next) {
             return;
         }
 
         $this->forward($next);
     }
 
     /**
      * Forward request with next action
      *
      * @param  array $next
      * @return void
      */
     public function forward(Zend_Controller_Request_Abstract $next)
     {
         $request = $this->getRequest();
         if ($this->getClearRequestParams()) {
             $request->clearParams();
         }
 
         $request->setModuleName($next->getModuleName())
                 ->setControllerName($next->getControllerName())
                 ->setActionName($next->getActionName())
                 ->setParams($next->getParams())
                 ->setDispatched(false);
     }
 }