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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_EventManager
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 
 // require_once 'Zend/EventManager/Event.php';
 // require_once 'Zend/EventManager/EventCollection.php';
 // require_once 'Zend/EventManager/ResponseCollection.php';
 // require_once 'Zend/EventManager/SharedEventCollectionAware.php';
 // require_once 'Zend/EventManager/StaticEventManager.php';
 // require_once 'Zend/Stdlib/CallbackHandler.php';
 // require_once 'Zend/Stdlib/PriorityQueue.php';
 
 /**
  * Event manager: notification system
  *
  * Use the EventManager when you want to create a per-instance notification
  * system for your objects.
  *
  * @category   Zend
  * @package    Zend_EventManager
  * @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_EventManager_EventManager implements Zend_EventManager_EventCollection, Zend_EventManager_SharedEventCollectionAware
 {
     /**
      * Subscribed events and their listeners
      * @var array Array of Zend_Stdlib_PriorityQueue objects
      */
     protected $events = array();
 
     /**
      * @var string Class representing the event being emitted
      */
     protected $eventClass = 'Zend_EventManager_Event';
 
     /**
      * Identifiers, used to pull static signals from StaticEventManager
      * @var array
      */
     protected $identifiers = array();
 
     /**
      * Static collections
      * @var false|null|Zend_EventManager_StaticEventCollection
      */
     protected $sharedCollections = null;
 
     /**
      * Constructor
      *
      * Allows optionally specifying identifier(s) to use to pull signals from a
      * StaticEventManager.
      *
      * @param  null|string|int|array|Traversable $identifiers
      * @return void
      */
     public function __construct($identifiers = null)
     {
         $this->setIdentifiers($identifiers);
     }
 
     /**
      * Set the event class to utilize
      *
      * @param  string $class
      * @return Zend_EventManager_EventManager
      */
     public function setEventClass($class)
     {
         $this->eventClass = $class;
         return $this;
     }
 
     /**
      * Set static collections container
      *
      * @param  Zend_EventManager_SharedEventCollection $collections
      * @return $this
      */
     public function setSharedCollections(Zend_EventManager_SharedEventCollection $collections)
     {
         $this->sharedCollections = $collections;
         return $this;
     }
 
     /**
      * Remove any shared collections
      *
      * Sets {@link $sharedCollections} to boolean false to disable ability
      * to lazy-load static event manager instance.
      * 
      * @return void
      */
     public function unsetSharedCollections()
     {
         $this->sharedCollections = false;
     }
 
     /**
      * Get static collections container
      *
      * @return false|Zend_EventManager_SharedEventCollection
      */
     public function getSharedCollections()
     {
         if (null === $this->sharedCollections) {
             $this->setSharedCollections(Zend_EventManager_StaticEventManager::getInstance());
         }
         return $this->sharedCollections;
     }
 
     /**
      * Get the identifier(s) for this Zend_EventManager_EventManager
      *
      * @return array
      */
     public function getIdentifiers()
     {
         return $this->identifiers;
     }
 
     /**
      * Set the identifiers (overrides any currently set identifiers)
      *
      * @param string|int|array|Traversable $identifiers
      * @return Zend_EventManager_EventManager
      */
     public function setIdentifiers($identifiers)
     {
         if (is_array($identifiers) || $identifiers instanceof Traversable) {
             $this->identifiers = array_unique((array) $identifiers);
         } elseif ($identifiers !== null) {
             $this->identifiers = array($identifiers);
         }
         return $this;
     }
 
     /**
      * Add some identifier(s) (appends to any currently set identifiers)
      *
      * @param string|int|array|Traversable $identifiers
      * @return Zend_EventManager_EventManager
      */
     public function addIdentifiers($identifiers)
     {
         if (is_array($identifiers) || $identifiers instanceof Traversable) {
             $this->identifiers = array_unique($this->identifiers + (array) $identifiers);
         } elseif ($identifiers !== null) {
             $this->identifiers = array_unique(array_merge($this->identifiers, array($identifiers)));
         }
         return $this;
     }
 
     /**
      * Trigger all listeners for a given event
      *
      * Can emulate triggerUntil() if the last argument provided is a callback.
      *
      * @param  string $event
      * @param  string|object $target Object calling emit, or symbol describing target (such as static method name)
      * @param  array|ArrayAccess $argv Array of arguments; typically, should be associative
      * @param  null|callback $callback
      * @return Zend_EventManager_ResponseCollection All listener return values
      */
     public function trigger($event, $target = null, $argv = array(), $callback = null)
     {
         if ($event instanceof Zend_EventManager_EventDescription) {
             $e        = $event;
             $event    = $e->getName();
             $callback = $target;
         } elseif ($target instanceof Zend_EventManager_EventDescription) {
             $e = $target;
             $e->setName($event);
             $callback = $argv;
         } elseif ($argv instanceof Zend_EventManager_EventDescription) {
             $e = $argv;
             $e->setName($event);
             $e->setTarget($target);
         } else {
             $e = new $this->eventClass();
             $e->setName($event);
             $e->setTarget($target);
             $e->setParams($argv);
         }
 
         if ($callback && !is_callable($callback)) {
             // require_once 'Zend/Stdlib/Exception/InvalidCallbackException.php';
             throw new Zend_Stdlib_Exception_InvalidCallbackException('Invalid callback provided');
         }
 
         return $this->triggerListeners($event, $e, $callback);
     }
 
     /**
      * Trigger listeners until return value of one causes a callback to
      * evaluate to true
      *
      * Triggers listeners until the provided callback evaluates the return
      * value of one as true, or until all listeners have been executed.
      *
      * @param  string $event
      * @param  string|object $target Object calling emit, or symbol describing target (such as static method name)
      * @param  array|ArrayAccess $argv Array of arguments; typically, should be associative
      * @param  Callable $callback
      * @throws Zend_Stdlib_Exception_InvalidCallbackException if invalid callback provided
      */
     public function triggerUntil($event, $target, $argv = null, $callback = null)
     {
         if ($event instanceof Zend_EventManager_EventDescription) {
             $e        = $event;
             $event    = $e->getName();
             $callback = $target;
         } elseif ($target instanceof Zend_EventManager_EventDescription) {
             $e = $target;
             $e->setName($event);
             $callback = $argv;
         } elseif ($argv instanceof Zend_EventManager_EventDescription) {
             $e = $argv;
             $e->setName($event);
             $e->setTarget($target);
         } else {
             $e = new $this->eventClass();
             $e->setName($event);
             $e->setTarget($target);
             $e->setParams($argv);
         }
 
         if (!is_callable($callback)) {
             // require_once 'Zend/Stdlib/Exception/InvalidCallbackException.php';
             throw new Zend_Stdlib_Exception_InvalidCallbackException('Invalid callback provided');
         }
 
         return $this->triggerListeners($event, $e, $callback);
     }
 
     /**
      * Attach a listener to an event
      *
      * The first argument is the event, and the next argument describes a
      * callback that will respond to that event. A CallbackHandler instance
      * describing the event listener combination will be returned.
      *
      * The last argument indicates a priority at which the event should be
      * executed. By default, this value is 1; however, you may set it for any
      * integer value. Higher values have higher priority (i.e., execute first).
      *
      * You can specify "*" for the event name. In such cases, the listener will 
      * be triggered for every event.
      *
      * @param  string|array|Zend_EventManager_ListenerAggregate $event An event or array of event names. If a ListenerAggregate, proxies to {@link attachAggregate()}.
      * @param  callback|int $callback If string $event provided, expects PHP callback; for a ListenerAggregate $event, this will be the priority
      * @param  int $priority If provided, the priority at which to register the callback
      * @return Zend_Stdlib_CallbackHandler|mixed CallbackHandler if attaching callback (to allow later unsubscribe); mixed if attaching aggregate
      */
     public function attach($event, $callback = null, $priority = 1)
     {
         // Proxy ListenerAggregate arguments to attachAggregate()
         if ($event instanceof Zend_EventManager_ListenerAggregate) {
             return $this->attachAggregate($event, $callback);
         }
 
         // Null callback is invalid
         if (null === $callback) {
             // require_once 'Zend/EventManager/Exception/InvalidArgumentException.php';
             throw new Zend_EventManager_Exception_InvalidArgumentException(sprintf(
                 '%s: expects a callback; none provided',
                 __METHOD__
             ));
         }
 
         // Array of events should be registered individually, and return an array of all listeners
         if (is_array($event)) {
             $listeners = array();
             foreach ($event as $name) {
                 $listeners[] = $this->attach($name, $callback, $priority);
             }
             return $listeners;
         }
 
         // If we don't have a priority queue for the event yet, create one
         if (empty($this->events[$event])) {
             $this->events[$event] = new Zend_Stdlib_PriorityQueue();
         }
 
         // Create a callback handler, setting the event and priority in its metadata
         $listener = new Zend_Stdlib_CallbackHandler($callback, array('event' => $event, 'priority' => $priority));
 
         // Inject the callback handler into the queue
         $this->events[$event]->insert($listener, $priority);
         return $listener;
     }
 
     /**
      * Attach a listener aggregate
      *
      * Listener aggregates accept an EventCollection instance, and call attach()
      * one or more times, typically to attach to multiple events using local
      * methods.
      *
      * @param  Zend_EventManager_ListenerAggregate $aggregate
      * @param  int $priority If provided, a suggested priority for the aggregate to use
      * @return mixed return value of {@link Zend_EventManager_ListenerAggregate::attach()}
      */
     public function attachAggregate(Zend_EventManager_ListenerAggregate $aggregate, $priority = 1)
     {
         return $aggregate->attach($this, $priority);
     }
 
     /**
      * Unsubscribe a listener from an event
      *
      * @param  Zend_Stdlib_CallbackHandler|Zend_EventManager_ListenerAggregate $listener
      * @return bool Returns true if event and listener found, and unsubscribed; returns false if either event or listener not found
      * @throws Zend_EventManager_Exception_InvalidArgumentException if invalid listener provided
      */
     public function detach($listener)
     {
         if ($listener instanceof Zend_EventManager_ListenerAggregate) {
             return $this->detachAggregate($listener);
         }
 
         if (!$listener instanceof Zend_Stdlib_CallbackHandler) {
             // require_once 'Zend/EventManager/Exception/InvalidArgumentException.php';
             throw new Zend_EventManager_Exception_InvalidArgumentException(sprintf(
                 '%s: expected a Zend_EventManager_ListenerAggregate or Zend_Stdlib_CallbackHandler; received "%s"',
                 __METHOD__,
                 (is_object($listener) ? get_class($listener) : gettype($listener))
             ));
         }
 
         $event = $listener->getMetadatum('event');
         if (!$event || empty($this->events[$event])) {
             return false;
         }
         $return = $this->events[$event]->remove($listener);
         if (!$return) {
             return false;
         }
         if (!count($this->events[$event])) {
             unset($this->events[$event]);
         }
         return true;
     }
 
     /**
      * Detach a listener aggregate
      *
      * Listener aggregates accept an EventCollection instance, and call detach()
      * of all previously attached listeners.
      *
      * @param  Zend_EventManager_ListenerAggregate $aggregate
      * @return mixed return value of {@link Zend_EventManager_ListenerAggregate::detach()}
      */
     public function detachAggregate(Zend_EventManager_ListenerAggregate $aggregate)
     {
         return $aggregate->detach($this);
     }
 
     /**
      * Retrieve all registered events
      *
      * @return array
      */
     public function getEvents()
     {
         return array_keys($this->events);
     }
 
     /**
      * Retrieve all listeners for a given event
      *
      * @param  string $event
      * @return Zend_Stdlib_PriorityQueue
      */
     public function getListeners($event)
     {
         if (!array_key_exists($event, $this->events)) {
             return new Zend_Stdlib_PriorityQueue();
         }
         return $this->events[$event];
     }
 
     /**
      * Clear all listeners for a given event
      *
      * @param  string $event
      * @return void
      */
     public function clearListeners($event)
     {
         if (!empty($this->events[$event])) {
             unset($this->events[$event]);
         }
     }
 
     /**
      * Prepare arguments
      *
      * Use this method if you want to be able to modify arguments from within a
      * listener. It returns an ArrayObject of the arguments, which may then be
      * passed to trigger() or triggerUntil().
      *
      * @param  array $args
      * @return ArrayObject
      */
     public function prepareArgs(array $args)
     {
         return new ArrayObject($args);
     }
 
     /**
      * Trigger listeners
      *
      * Actual functionality for triggering listeners, to which both trigger() and triggerUntil()
      * delegate.
      *
      * @param  string           $event Event name
      * @param  EventDescription $e
      * @param  null|callback    $callback
      * @return ResponseCollection
      */
     protected function triggerListeners($event, Zend_EventManager_EventDescription $e, $callback = null)
     {
         $responses = new Zend_EventManager_ResponseCollection;
         $listeners = $this->getListeners($event);
 
         // Add shared/wildcard listeners to the list of listeners,
         // but don't modify the listeners object
         $sharedListeners         = $this->getSharedListeners($event);
         $sharedWildcardListeners = $this->getSharedListeners('*');
         $wildcardListeners       = $this->getListeners('*');
         if (count($sharedListeners) || count($sharedWildcardListeners) || count($wildcardListeners)) {
             $listeners = clone $listeners;
         }
 
         // Shared listeners on this specific event
         $this->insertListeners($listeners, $sharedListeners);
 
         // Shared wildcard listeners
         $this->insertListeners($listeners, $sharedWildcardListeners);
 
         // Add wildcard listeners
         $this->insertListeners($listeners, $wildcardListeners);
 
         if ($listeners->isEmpty()) {
             return $responses;
         }
 
         foreach ($listeners as $listener) {
             // Trigger the listener's callback, and push its result onto the
             // response collection
             $responses->push(call_user_func($listener->getCallback(), $e));
 
             // If the event was asked to stop propagating, do so
             if ($e->propagationIsStopped()) {
                 $responses->setStopped(true);
                 break;
             }
 
             // If the result causes our validation callback to return true,
             // stop propagation
             if ($callback && call_user_func($callback, $responses->last())) {
                 $responses->setStopped(true);
                 break;
             }
         }
 
         return $responses;
     }
 
     /**
      * Get list of all listeners attached to the shared collection for
      * identifiers registered by this instance
      *
      * @param  string $event
      * @return array
      */
     protected function getSharedListeners($event)
     {
         if (!$sharedCollections = $this->getSharedCollections()) {
             return array();
         }
 
         $identifiers     = $this->getIdentifiers();
         $sharedListeners = array();
 
         foreach ($identifiers as $id) {
             if (!$listeners = $sharedCollections->getListeners($id, $event)) {
                 continue;
             }
 
             if (!is_array($listeners) && !($listeners instanceof Traversable)) {
                 continue;
             }
 
             foreach ($listeners as $listener) {
                 if (!$listener instanceof Zend_Stdlib_CallbackHandler) {
                     continue;
                 }
                 $sharedListeners[] = $listener;
             }
         }
 
         return $sharedListeners;
     }
 
     /**
      * Add listeners to the master queue of listeners
      *
      * Used to inject shared listeners and wildcard listeners.
      * 
      * @param  Zend_Stdlib_PriorityQueue $masterListeners 
      * @param  Zend_Stdlib_PriorityQueue $listeners 
      * @return void
      */
     protected function insertListeners($masterListeners, $listeners)
     {
         if (!count($listeners)) {
             return;
         }
 
         foreach ($listeners as $listener) {
             $priority = $listener->getMetadatum('priority');
             if (null === $priority) {
                 $priority = 1;
             } elseif (is_array($priority)) {
                 // If we have an array, likely using PriorityQueue. Grab first
                 // element of the array, as that's the actual priority.
                 $priority = array_shift($priority);
             }
             $masterListeners->insert($listener, $priority);
         }
     }
 }