<?php
/**
 * A action resolver for local (non-hubbed) actions
 *
 * @author		Roland Haeder <webmaster@ship-simu.org>
 * @version		0.0.0
 * @copyright	Copyright (c) 2007 - 2009 Roland Haeder, this is free software
 * @license		GNU GPL 3.0 or any newer version
 * @link		http://www.ship-simu.org
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
class WebActionResolver extends BaseActionResolver implements ActionResolver {
	/**
	 * Last successfull resolved action
	 */
	private $lastActionInstance = '';

	/**
	 * Protected constructor
	 *
	 * @return	void
	 */
	protected function __construct () {
		// Call parent constructor
		parent::__construct(__CLASS__);

		// Set prefix to "Web"
		$this->setActionPrefix("Web");
	}

	/**
	 * Creates an instance of a Web action resolver with a given default action
	 *
	 * @param	$actionName				The default action we shall execute
	 * @param	$appInstance			An instance of a manageable application helper class
	 * @return	$resolverInstance		The prepared action resolver instance
	 * @throws	EmptyVariableException	Thrown if default action is not set
	 * @throws	InvalidActionException	Thrown if default action is invalid
	 */
	public final static function createWebActionResolver ($actionName, ManageableApplication $appInstance) {
		// Create the new instance
		$resolverInstance = new WebActionResolver();

		// Is the variable $actionName set and the action is valid?
		if (empty($actionName)) {
			// Then thrown an exception here
			throw new EmptyVariableException(array($resolverInstance, 'defaultAction'), self::EXCEPTION_UNEXPECTED_EMPTY_STRING);
		} elseif ($resolverInstance->isActionValid($actionName) === false) {
			// Invalid action found
			throw new InvalidActionException(array($resolverInstance, $actionName), self::EXCEPTION_INVALID_ACTION);
		}

		// Set the application instance
		$resolverInstance->setApplicationInstance($appInstance);

		// Return the prepared instance
		return $resolverInstance;
	}

	/**
	 * Returns an action instance for a given request class or null if
	 * it was not found
	 *
	 * @param	$requestInstance	An instance of a request class
	 * @return	$actionInstance	An instance of the resolved action
	 * @throws	InvalidActionException				Thrown if $actionName is
	 *												invalid
	 * @throws	InvalidActionInstanceException		Thrown if $actionInstance
	 *												is an invalid instance
	 */
	public function resolveActionByRequest (Requestable $requestInstance) {
		// Init variables
		$actionName = '';
		$actionInstance = null;

		// This goes fine so let's resolv the action
		$actionName = $requestInstance->getRequestElement('action');

		// Is the action empty? Then fall back to default action
		if (empty($actionName)) $actionName = $this->getConfigInstance()->readConfig('default_action');

		// Check if action is valid
		if ($this->isActionValid($actionName) === false) {
			// This action is invalid!
			throw new InvalidActionException(array($this, $actionName), self::EXCEPTION_INVALID_ACTION);
		} // END - if

		// Get the action
		$actionInstance = $this->loadAction();

		// And validate it
		if ((!is_object($actionInstance)) || (!$actionInstance instanceof Actionable)) {
			// This action has an invalid instance!
			throw new InvalidActionInstanceException(array($this, $actionName), self::EXCEPTION_INVALID_ACTION);
		} // END - if

		// Set last action
		$this->lastActionInstance = $actionInstance;

		// Return the resolved action instance
		return $actionInstance;
	}

	/**
	 * Resolves the action by its direct name and returns an instance of its class
	 *
	 * @return	$actionInstance		An instance of the action class
	 * @throws	InvalidActionException	Thrown if $actionName is invalid
	 */
	public function resolveAction () {
		// Initiate the instance variable
		$actionInstance = null;

		// Get action name
		$actionName = $this->getActionName();

		// Is the action empty? Then fall back to default action
		if (empty($actionName)) $actionName = $this->getConfigInstance()->readConfig('default_action');

		// Check if action is valid
		if ($this->isActionValid($actionName) === false) {
			// This action is invalid!
			throw new InvalidActionException(array($this, $actionName), self::EXCEPTION_INVALID_ACTION);
		}

		// Get the action
		$actionInstance = $this->loadAction();

		// Return the instance
		return $actionInstance;
	}
}

// [EOF]
?>