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<?php

/**

 * Dispatcher takes the URL information, parses it for parameters and

 * tells the involved controllers what to do.

 *

 * This is the heart of CakePHP's operation.

 *

 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)

 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 *

 * Licensed under The MIT License

 * For full copyright and license information, please see the LICENSE.txt

 * Redistributions of files must retain the above copyright notice.

 *

 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 * @link          http://cakephp.org CakePHP(tm) Project

 * @package       Cake.Routing

 * @since         CakePHP(tm) v 0.2.9

 * @license       http://www.opensource.org/licenses/mit-license.php MIT License

 */

App::uses('Router', 'Routing');

App::uses('CakeRequest', 'Network');

App::uses('CakeResponse', 'Network');

App::uses('Controller', 'Controller');

App::uses('Scaffold', 'Controller');

App::uses('View', 'View');

App::uses('Debugger', 'Utility');

App::uses('CakeEvent', 'Event');

App::uses('CakeEventManager', 'Event');

App::uses('CakeEventListener', 'Event');

/**

 * Dispatcher converts Requests into controller actions. It uses the dispatched Request

 * to locate and load the correct controller. If found, the requested action is called on

 * the controller.

 *

 * @package       Cake.Routing

 */

class Dispatcher implements CakeEventListener {

/**

 * Event manager, used to handle dispatcher filters

 *

 * @var CakeEventManager

 */

	protected $_eventManager;

/**

 * Constructor.

 *

 * @param string $base The base directory for the application. Writes `App.base` to Configure.

 */

	public function __construct($base = false) {

		if ($base !== false) {

			Configure::write('App.base', $base);

		}

	}

/**

 * Returns the CakeEventManager instance or creates one if none was

 * created. Attaches the default listeners and filters

 *

 * @return CakeEventManager

 */

	public function getEventManager() {

		if (!$this->_eventManager) {

			$this->_eventManager = new CakeEventManager();

			$this->_eventManager->attach($this);

			$this->_attachFilters($this->_eventManager);

		}

		return $this->_eventManager;

	}

/**

 * Returns the list of events this object listens to.

 *

 * @return array

 */

	public function implementedEvents() {

		return array('Dispatcher.beforeDispatch' => 'parseParams');

	}

/**

 * Attaches all event listeners for this dispatcher instance. Loads the

 * dispatcher filters from the configured locations.

 *

 * @param CakeEventManager $manager

 * @return void

 * @throws MissingDispatcherFilterException

 */

	protected function _attachFilters($manager) {

		$filters = Configure::read('Dispatcher.filters');

		if (empty($filters)) {

			return;

		}

		foreach ($filters as $filter) {

			if (is_string($filter)) {

				$filter = array('callable' => $filter);

			}

			if (is_string($filter['callable'])) {

				list($plugin, $callable) = pluginSplit($filter['callable'], true);

				App::uses($callable, $plugin . 'Routing/Filter');

				if (!class_exists($callable)) {

					throw new MissingDispatcherFilterException($callable);

				}

				$manager->attach(new $callable);

			} else {

				$on = strtolower($filter['on']);

				$options = array();

				if (isset($filter['priority'])) {

					$options = array('priority' => $filter['priority']);

				}

				$manager->attach($filter['callable'], 'Dispatcher.' . $on . 'Dispatch', $options);

			}

		}

	}

/**

 * Dispatches and invokes given Request, handing over control to the involved controller. If the controller is set

 * to autoRender, via Controller::$autoRender, then Dispatcher will render the view.

 *

 * Actions in CakePHP can be any public method on a controller, that is not declared in Controller. If you

 * want controller methods to be public and in-accessible by URL, then prefix them with a `_`.

 * For example `public function _loadPosts() { }` would not be accessible via URL. Private and protected methods

 * are also not accessible via URL.

 *

 * If no controller of given name can be found, invoke() will throw an exception.

 * If the controller is found, and the action is not found an exception will be thrown.

 *

 * @param CakeRequest $request Request object to dispatch.

 * @param CakeResponse $response Response object to put the results of the dispatch into.

 * @param array $additionalParams Settings array ("bare", "return") which is melded with the GET and POST params

 * @return string|void if `$request['return']` is set then it returns response body, null otherwise

 * @throws MissingControllerException When the controller is missing.

 */

	public function dispatch(CakeRequest $request, CakeResponse $response, $additionalParams = array()) {

		$beforeEvent = new CakeEvent('Dispatcher.beforeDispatch', $this, compact('request', 'response', 'additionalParams'));

		$this->getEventManager()->dispatch($beforeEvent);

		$request = $beforeEvent->data['request'];

		if ($beforeEvent->result instanceof CakeResponse) {

			if (isset($request->params['return'])) {

				return $beforeEvent->result->body();

			}

			$beforeEvent->result->send();

			return;

		}

		$controller = $this->_getController($request, $response);

		if (!($controller instanceof Controller)) {

			throw new MissingControllerException(array(

				'class' => Inflector::camelize($request->params['controller']) . 'Controller',

				'plugin' => empty($request->params['plugin']) ? null : Inflector::camelize($request->params['plugin'])

			));

		}

		$response = $this->_invoke($controller, $request, $response);

		if (isset($request->params['return'])) {

			return $response->body();

		}

		$afterEvent = new CakeEvent('Dispatcher.afterDispatch', $this, compact('request', 'response'));

		$this->getEventManager()->dispatch($afterEvent);

		$afterEvent->data['response']->send();

	}

/**

 * Initializes the components and models a controller will be using.

 * Triggers the controller action, and invokes the rendering if Controller::$autoRender is true and echo's the output.

 * Otherwise the return value of the controller action are returned.

 *

 * @param Controller $controller Controller to invoke

 * @param CakeRequest $request The request object to invoke the controller for.

 * @param CakeResponse $response The response object to receive the output

 * @return CakeResponse the resulting response object

 */

	protected function _invoke(Controller $controller, CakeRequest $request, CakeResponse $response) {

		$controller->constructClasses();

		$controller->startupProcess();

		$render = true;

		$result = $controller->invokeAction($request);

		if ($result instanceof CakeResponse) {

			$render = false;

			$response = $result;

		}

		if ($render && $controller->autoRender) {

			$response = $controller->render();

		} elseif (!($result instanceof CakeResponse) && $response->body() === null) {

			$response->body($result);

		}

		$controller->shutdownProcess();

		return $response;

	}

/**

 * Applies Routing and additionalParameters to the request to be dispatched.

 * If Routes have not been loaded they will be loaded, and app/Config/routes.php will be run.

 *

 * @param CakeEvent $event containing the request, response and additional params

 * @return void

 */

	public function parseParams($event) {

		$request = $event->data['request'];

		Router::setRequestInfo($request);

		$params = Router::parse($request->url);

		$request->addParams($params);

		if (!empty($event->data['additionalParams'])) {

			$request->addParams($event->data['additionalParams']);

		}

	}

/**

 * Get controller to use, either plugin controller or application controller

 *

 * @param CakeRequest $request Request object

 * @param CakeResponse $response Response for the controller.

 * @return mixed name of controller if not loaded, or object if loaded

 */

	protected function _getController($request, $response) {

		$ctrlClass = $this->_loadController($request);

		if (!$ctrlClass) {

			return false;

		}

		$reflection = new ReflectionClass($ctrlClass);

		if ($reflection->isAbstract() || $reflection->isInterface()) {

			return false;

		}

		return $reflection->newInstance($request, $response);

	}

/**

 * Load controller and return controller class name

 *

 * @param CakeRequest $request

 * @return string|boolean Name of controller class name

 */

	protected function _loadController($request) {

		$pluginName = $pluginPath = $controller = null;

		if (!empty($request->params['plugin'])) {

			$pluginName = $controller = Inflector::camelize($request->params['plugin']);

			$pluginPath = $pluginName . '.';

		}

		if (!empty($request->params['controller'])) {

			$controller = Inflector::camelize($request->params['controller']);

		}

		if ($pluginPath . $controller) {

			$class = $controller . 'Controller';

			App::uses('AppController', 'Controller');

			App::uses($pluginName . 'AppController', $pluginPath . 'Controller');

			App::uses($class, $pluginPath . 'Controller');

			if (class_exists($class)) {

				return $class;

			}

		}

		return false;

	}

}