<?php
require_once 'Flux/Config.php';
require_once 'Flux/Template.php';

/**
 * The dispatcher is used to handle the current request to the application and
 * forward it to the correct module/action, after which point the view should
 * be rendered.
 *
 * Currently all the "important" behavior is done from Flux_Template.
 */
class Flux_Dispatcher {
	/**
	 * Dispatcher instance.
	 *
	 * @access private
	 * @var Flux_Dispatcher
	 */
	private static $dispatcher;
	
	/**
	 * Default module.
	 *
	 * @access public
	 * @var string
	 */
	public $defaultModule;
	
	/**
	 * Default action.
	 *
	 * @access public
	 * @var string
	 */
	public $defaultAction = 'index';
	
	/**
	 * See Flux_Dispatcher::getInstance().
	 *
	 * @access private
	 */
	private function __construct()
	{
		
	}
	
	/**
	 * Construct new dispatcher instance of one doesn't exist. But there can
	 * only be a single instance of the dispatcher.
	 *
	 * @return Flux_Dispatcher
	 * @access public
	 */
	public static function getInstance()
	{
		if (!self::$dispatcher) {
			self::$dispatcher = new Flux_Dispatcher();
		}
		return self::$dispatcher;
	}
	
	/**
	 * Dispatch current request to the correct action and render the view.
	 *
	 * @param array $options Options for the dispatcher.
	 * @access public
	 */
	public function dispatch($options = array())
	{
		$config                    = new Flux_Config($options);
		$basePath                  = $config->get('basePath');
		$paramsArr                 = $config->get('params');
		$modulePath                = $config->get('modulePath');
		$themePath                 = $config->get('themePath');
		$themeName                 = $config->get('themeName');
		$defaultModule             = $config->get('defaultModule');
		$defaultAction             = $config->get('defaultAction');
		$missingActionModuleAction = $config->get('missingActionModuleAction');
		$missingViewModuleAction   = $config->get('missingViewModuleAction');
		$useCleanUrls              = $config->get('useCleanUrls');
		
		if (!$defaultModule && $this->defaultModule) {
			$defaultModule = $this->defaultModule;
		}
		if (!$defaultAction && $this->defaultAction) {
			$defaultAction = $this->defaultAction;
		}
		
		if (!$defaultModule) {
			throw new Flux_Error('Please set the default module with $dispatcher->setDefaultModule()');
		}
		elseif (!$defaultAction) {
			throw new Flux_Error('Please set the default action with $dispatcher->setDefaultAction()');
		}
		
		if (!$paramsArr) {
			$paramsArr = &$_REQUEST;
		}
		
		// Provide easier access to parameters.
		$params  = new Flux_Config($paramsArr);
		$baseURI = Flux::config('BaseURI');
		
		if ($params->get('module')) {
			$safetyArr  = array('..', '/', '\\');
			$moduleName = str_replace($safetyArr, '', $params->get('module'));
			if ($params->get('action')) {
				$actionName = str_replace($safetyArr, '', $params->get('action'));
			}
			else {
				$actionName = $defaultAction;
			}
		}
		elseif (Flux::config('UseCleanUrls')) {
			$baseURI    = preg_replace('&/+&', '/', rtrim($baseURI, '/')).'/';
			$requestURI = preg_replace('&/+&', '/', rtrim($_SERVER['REQUEST_URI'], '/')).'/';
			$requestURI = preg_replace('&\?.*?$&', '', $requestURI);
			$components = explode('/', trim((string)substr($requestURI, strlen($baseURI)), '/'));
			$moduleName = empty($components[0]) ? $defaultModule : $components[0];
			$actionName = empty($components[1]) ? $defaultAction : $components[1];
		}
		elseif (!$params->get('module') && !$params->get('action')) {
			$moduleName = $defaultModule;
			$actionName = $defaultAction;
		}
		
		// Authorization handling.
		$auth = Flux_Authorization::getInstance();
		if ($auth->actionAllowed($moduleName, $actionName) === false) {
			if (!Flux::$sessionData->isLoggedIn()) {
				Flux::$sessionData->setMessageData('Please log-in to continue.');
				$this->loginRequired($baseURI);
			}
			else {
				$moduleName = 'unauthorized';
				$actionName = $this->defaultAction;
			}
		}
		
		$params->set('module', $moduleName);
		$params->set('action', $actionName);
		
		$templateArray  = array(
			'params'                    => $params,
			'basePath'                  => $basePath,
			'modulePath'                => $modulePath,
			'moduleName'                => $moduleName,
			'themePath'                 => $themePath,
			'themeName'                 => $themeName,
			'actionName'                => $actionName,
			'viewName'                  => $actionName,
			'headerName'                => 'header',
			'footerName'                => 'footer',
			'missingActionModuleAction' => $missingActionModuleAction,
			'missingViewModuleAction'   => $missingViewModuleAction,
			'useCleanUrls'              => $useCleanUrls
		);
		$templateConfig = new Flux_Config($templateArray);
		$template       = new Flux_Template($templateConfig);
		
		// Default data available to all actions and views.
		$data = array(
			'auth'    => Flux_Authorization::getInstance(),
			'session' => Flux::$sessionData,
			'params'  => $params
		);
		$template->setDefaultData($data);
		
		// Render template! :D
		$template->render();
	}
	
	/**
	 * This usually needs to be called after instanciating the dispatcher, as
	 * it's very necessary to the dispatcher's failsafe functionality.
	 *
	 * @param string $module Module name
	 * @return string
	 * @access public
	 */
	public function setDefaultModule($module)
	{
		$this->defaultModule = $module;
		return $module;
	}
	
	/**
	 * (DEPRECATED) By default, 'index' is the default action for any module, but you may
	 * override that by using this method.
	 *
	 * @param string $action Action name
	 * @return string
	 * @access public
	 */
	public function setDefaultAction($action)
	{
		$this->defaultAction = $action;
		return $action;
	}
	
	/**
	 * Redirect to login page if the user is not currently logged in.
	 *
	 * @param string $baseURI
	 * @param string $loginModule
	 * @param string $loginAction
	 * @access private
	 */
	public function loginRequired($baseURI, $message = null, $loginModule = 'account', $loginAction = 'login')
	{
		$session = Flux::$sessionData;
		if (!$message) {
			$message = 'Please login to continue.';
		}
		
		if (!$session->isLoggedIn()) {
			if (Flux::config('UseCleanUrls')) {
				$loginURL = sprintf('%s/%s/%s/?return_url=%s',
					$baseURI, $loginModule, $loginAction, rawurlencode($_SERVER['REQUEST_URI']));
			}
			else {
				$loginURL = sprintf('%s/?module=%s&action=%s&return_url=%s',
					$baseURI, rawurlencode($loginModule), rawurlencode($loginAction), rawurlencode($_SERVER['REQUEST_URI']));
			}
			
			$session->setMessageData($message);
			header('Location: '.preg_replace('&/{2,}&', '/', $loginURL));
			exit;
		}
	}
}
?>