<?php
/* --------------------------------------------------------------
   HttpDispatcher.inc.php 2015-03-12 gm
   Gambio GmbH
   http://www.gambio.de
   Copyright (c) 2015 Gambio GmbH
   Released under the GNU General Public License (Version 2)
   [http://www.gnu.org/licenses/gpl-2.0.html]
   --------------------------------------------------------------
*/

MainFactory::load_class('HttpDispatcherInterface');

/**
 * Class HttpDispatcher
 *
 * @category   System
 * @package    Http
 * @implements HttpDispatcherInterface
 */
class HttpDispatcher implements HttpDispatcherInterface
{
    /**
     * @var HttpContextReaderInterface
     */
    protected $httpContextReader;
    
    /**
     * @var HttpViewControllerFactoryInterface
     */
    protected $httpViewControllerFactory;
    
    
    /**
     * Initializes the http dispatcher.
     *
     * @param HttpContextReaderInterface         $httpContextReader
     * @param HttpViewControllerFactoryInterface $httpViewControllerFactory
     *
     * @throws MissingControllerNameException If no controller is found.
     */
    public function __construct(
        HttpContextReaderInterface $httpContextReader,
        HttpViewControllerFactoryInterface $httpViewControllerFactory
    ) {
        $this->httpContextReader         = $httpContextReader;
        $this->httpViewControllerFactory = $httpViewControllerFactory;
    }
    
    
    /**
     * Dispatches the current http request.
     * If the http request is valid and can get handled by a controller class, the controllers ::proceed
     * method is invoked by the dispatcher. Otherwise, the method will throw a missing controller name exception.
     *
     * @param HttpContextInterface $httpContext Object which holds information about the current http context.
     *
     * @throws MissingControllerNameException When the http request context is invalid.
     */
    public function dispatch(HttpContextInterface $httpContext)
    {
        $controllerName = $this->httpContextReader->getControllerName($httpContext);
        if (empty($controllerName)) {
            throw new MissingControllerNameException('No controller name found in given HttpContext');
        }
        
        $controller = $this->httpViewControllerFactory->createController($controllerName);
        if ($controller instanceof AdminStatusOnlyInterface) {
            $controller->validateCurrentAdminStatus();
        }
        $controller->proceed($httpContext);
    }
}