<?php
/**
 * The most common kind of controller; effectively a controller linked to a {@link DataObject}.
 *
 * ContentControllers are most useful in the content-focused areas of a site.  This is generally
 * the bulk of a site; however, they may be less appropriate in, for example, the user management
 * section of an application.
 *
 * On its own, content controller does very little.  Its constructor is passed a {@link DataObject}
 * which is stored in $this->dataRecord.  Any unrecognised method calls, for example, Title()
 * and Content(), will be passed along to the data record,
 *
 * Subclasses of ContentController are generally instantiated by ModelAsController; this will create
 * a controller based on the URLSegment action variable, by looking in the SiteTree table.
 * 
 * @todo Can this be used for anything other than SiteTree controllers?
 *
 * @package cms
 * @subpackage control
 */
class ContentController extends Controller {

	protected $dataRecord;

	private static $extensions = array('OldPageRedirector');

	private static $allowed_actions = array(
		'successfullyinstalled',
		'deleteinstallfiles', // secured through custom code
		'LoginForm'
	);
	
	/**
	 * The ContentController will take the URLSegment parameter from the URL and use that to look
	 * up a SiteTree record.
	 */
	public function __construct($dataRecord = null) {
		if(!$dataRecord) {
			$dataRecord = new Page();
			if($this->hasMethod("Title")) $dataRecord->Title = $this->Title();
			$dataRecord->URLSegment = get_class($this);
			$dataRecord->ID = -1;
		}
		
		$this->dataRecord = $dataRecord;
		$this->failover = $this->dataRecord;
		parent::__construct();
	}
	
	/**
	 * Return the link to this controller, but force the expanded link to be returned so that form methods and
	 * similar will function properly.
	 *
	 * @param string|null $action Action to link to.
	 * @return string
	 */
	public function Link($action = null) {
		return $this->data()->Link(($action ? $action : true));
	}
	
	//----------------------------------------------------------------------------------//
	// These flexible data methods remove the need for custom code to do simple stuff
	
	/**
	 * Return the children of a given page. The parent reference can either be a page link or an ID.
	 *
	 * @param string|int $parentRef
	 * @return SS_List
	 */
	public function ChildrenOf($parentRef) {
		$parent = SiteTree::get_by_link($parentRef);
		
		if(!$parent && is_numeric($parentRef)) {
			$parent = DataObject::get_by_id('SiteTree', Convert::raw2sql($parentRef));
		}
		
		if($parent) return $parent->Children();
	}
	
	/**
	 * @param string $link
	 * @return SiteTree
	 */
	public function Page($link) {
		return SiteTree::get_by_link($link);
	}

	public function init() {
		parent::init();
		
		// If we've accessed the homepage as /home/, then we should redirect to /.
		if($this->dataRecord && $this->dataRecord instanceof SiteTree
			 	&& RootURLController::should_be_on_root($this->dataRecord) && (!isset($this->urlParams['Action']) || !$this->urlParams['Action'] ) 
				&& !$_POST && !$_FILES && !$this->redirectedTo() ) {
			$getVars = $_GET;
			unset($getVars['url']);
			if($getVars) $url = "?" . http_build_query($getVars);
			else $url = "";
			$this->redirect($url, 301);
			return;
		}
		
		if($this->dataRecord) $this->dataRecord->extend('contentcontrollerInit', $this);
		else singleton('SiteTree')->extend('contentcontrollerInit', $this);

		if($this->redirectedTo()) return;

		// Check page permissions
		if($this->dataRecord && $this->URLSegment != 'Security' && !$this->dataRecord->canView()) {
			return Security::permissionFailure($this);
		}

		// Draft/Archive security check - only CMS users should be able to look at stage/archived content
		if(
			$this->URLSegment != 'Security' 
			&& !Session::get('unsecuredDraftSite') 
			&& (
				Versioned::current_archived_date() 
				|| (Versioned::current_stage() && Versioned::current_stage() != 'Live')
			)
		) {
			if(!$this->dataRecord->canViewStage(Versioned::current_archived_date() ? 'Stage' : Versioned::current_stage())) {
				$link = $this->Link();
				$message = _t(
					"ContentController.DRAFT_SITE_ACCESS_RESTRICTION", 
					'You must log in with your CMS password in order to view the draft or archived content. ' .
					'<a href="%s">Click here to go back to the published site.</a>'
				);
				Session::clear('currentStage');
				Session::clear('archiveDate');
				
				$permissionMessage = sprintf(
					_t(
						"ContentController.DRAFT_SITE_ACCESS_RESTRICTION",
						'You must log in with your CMS password in order to view the draft or archived content. '.
						'<a href="%s">Click here to go back to the published site.</a>'
					),
					Controller::join_links($this->Link(), "?stage=Live")
				);

				return Security::permissionFailure($this, $permissionMessage);
			}

		}
		
		// Use theme from the site config
		if(($config = SiteConfig::current_site_config()) && $config->Theme) {
			Config::inst()->update('SSViewer', 'theme', $config->Theme);
		}
	}
	
	/**
	 * This acts the same as {@link Controller::handleRequest()}, but if an action cannot be found this will attempt to
	 * fall over to a child controller in order to provide functionality for nested URLs.
	 *
	 * @param SS_HTTPRequest $request
	 * @param DataModel $model
	 * @return SS_HTTPResponse
	 * @throws SS_HTTPResponse_Exception
	 */
	public function handleRequest(SS_HTTPRequest $request, DataModel $model = null) {
		$child  = null;
		$action = $request->param('Action');
		$this->setDataModel($model);
		
		// If nested URLs are enabled, and there is no action handler for the current request then attempt to pass
		// control to a child controller. This allows for the creation of chains of controllers which correspond to a
		// nested URL.
		if($action && SiteTree::config()->nested_urls && !$this->hasAction($action)) {
			// See ModelAdController->getNestedController() for similar logic
			if(class_exists('Translatable')) Translatable::disable_locale_filter();
			// look for a page with this URLSegment
			$child = $this->model->SiteTree->filter(array(
				'ParentID' => $this->ID,
				'URLSegment' => rawurlencode($action)
			))->first();
			if(class_exists('Translatable')) Translatable::enable_locale_filter();
		}
		
		// we found a page with this URLSegment.
		if($child) {
			$request->shiftAllParams();
			$request->shift();
			
			$response = ModelAsController::controller_for($child)->handleRequest($request, $model);
		} else {
			// If a specific locale is requested, and it doesn't match the page found by URLSegment,
			// look for a translation and redirect (see #5001). Only happens on the last child in
			// a potentially nested URL chain.
			if(class_exists('Translatable')) {
				if($request->getVar('locale') && $this->dataRecord && $this->dataRecord->Locale != $request->getVar('locale')) {
					$translation = $this->dataRecord->getTranslation($request->getVar('locale'));
					if($translation) {
						$response = new SS_HTTPResponse();
						$response->redirect($translation->Link(), 301);
						throw new SS_HTTPResponse_Exception($response);
					}
				}
			}
			
			Director::set_current_page($this->data());
			$response = parent::handleRequest($request, $model);
			Director::set_current_page(null);
		}
		
		return $response;
	}
	
	/**
	 * @uses ErrorPage::response_for()
	 */
	public function httpError($code, $message = null) {
		// Don't use the HTML response for media requests
		$response = $this->request->isMedia() ? null : ErrorPage::response_for($code);
		// Failover to $message if the HTML response is unavailable / inappropriate
		parent::httpError($code, $response ? $response : $message);
		}

	/**
	 * Get the project name
	 *
	 * @return string
	 */
	public function project() {
		global $project;
		return $project;
	}
	
	/**
	 * Returns the associated database record
	 */
	public function data() {
		return $this->dataRecord;
	}

	/*--------------------------------------------------------------------------------*/

	/**
	 * Returns a fixed navigation menu of the given level.
	 * @param int $level Menu level to return.
	 * @return ArrayList
	 */
	public function getMenu($level = 1) {
		if($level == 1) {
			$result = SiteTree::get()->filter(array(
				"ShowInMenus" => 1,
				"ParentID" => 0
			));

		} else {
			$parent = $this->data();
			$stack = array($parent);
			
			if($parent) {
				while($parent = $parent->Parent) {
					array_unshift($stack, $parent);
				}
			}
			
			if(isset($stack[$level-2])) $result = $stack[$level-2]->Children();
		}

		$visible = array();

		// Remove all entries the can not be viewed by the current user
		// We might need to create a show in menu permission
 		if(isset($result)) {
			foreach($result as $page) {
				if($page->canView()) {
					$visible[] = $page;
				}
			}
		}

		return new ArrayList($visible);
	}

	public function Menu($level) {
		return $this->getMenu($level);
	}

	/**
	 * Returns the default log-in form.
	 *
	 * @todo Check if here should be returned just the default log-in form or
	 *       all available log-in forms (also OpenID...)
	 */
	public function LoginForm() {
		return MemberAuthenticator::get_login_form($this);
	}

	public function SilverStripeNavigator() {
		$member = Member::currentUser();
		$items = '';
		$message = '';

		if(Director::isDev() || Permission::check('CMS_ACCESS_CMSMain') || Permission::check('VIEW_DRAFT_CONTENT')) {			
			if($this->dataRecord) {
				Requirements::css(CMS_DIR . '/css/SilverStripeNavigator.css');
				Requirements::javascript(FRAMEWORK_DIR . '/thirdparty/jquery/jquery.js');
				Requirements::javascript(CMS_DIR . '/javascript/SilverStripeNavigator.js');
				
				$return = $nav = SilverStripeNavigator::get_for_record($this->dataRecord);
				$items = $return['items'];
				$message = $return['message'];
			}

			if($member) {
				$firstname = Convert::raw2xml($member->FirstName);
				$surname = Convert::raw2xml($member->Surname);
				$logInMessage = _t('ContentController.LOGGEDINAS', 'Logged in as') ." {$firstname} {$surname} - <a href=\"Security/logout\">". _t('ContentController.LOGOUT', 'Log out'). "</a>";
			} else {
				$logInMessage = sprintf(
					'%s - <a href="%s">%s</a>' ,
					_t('ContentController.NOTLOGGEDIN', 'Not logged in') ,
					Config::inst()->get('Security', 'login_url'),
					_t('ContentController.LOGIN', 'Login') ."</a>"
				);
			}
			$viewPageIn = _t('ContentController.VIEWPAGEIN', 'View Page in:');
			
			return <<<HTML
				<div id="SilverStripeNavigator">
					<div class="holder">
					<div id="logInStatus">
						$logInMessage
					</div>

					<div id="switchView" class="bottomTabs">
						$viewPageIn 
						$items
					</div>
					</div>
				</div>
					$message
HTML;

		// On live sites we should still see the archived message
		} else {
			if($date = Versioned::current_archived_date()) {
				Requirements::css(CMS_DIR . '/css/SilverStripeNavigator.css');
				$dateObj = Datetime::create($date, null);
				// $dateObj->setVal($date);
				return "<div id=\"SilverStripeNavigatorMessage\">". _t('ContentController.ARCHIVEDSITEFROM') ."<br>" . $dateObj->Nice() . "</div>";
			}
		}
	}
	
	public function SiteConfig() {
		if(method_exists($this->dataRecord, 'getSiteConfig')) {
			return $this->dataRecord->getSiteConfig();
		} else {
			return SiteConfig::current_site_config();
		}
	}

	/**
	 * Returns an RFC1766 compliant locale string, e.g. 'fr-CA'.
	 * Inspects the associated {@link dataRecord} for a {@link SiteTree->Locale} value if present,
	 * and falls back to {@link Translatable::get_current_locale()} or {@link i18n::default_locale()},
	 * depending if Translatable is enabled.
	 * 
	 * Suitable for insertion into lang= and xml:lang=
	 * attributes in HTML or XHTML output.
	 * 
	 * @return string
	 */
	public function ContentLocale() {
		if($this->dataRecord && $this->dataRecord->hasExtension('Translatable')) {
			$locale = $this->dataRecord->Locale;
		} elseif(class_exists('Translatable') && SiteTree::has_extension('Translatable')) {
			$locale = Translatable::get_current_locale();
		} else {
			$locale = i18n::get_locale();
		}
		
		return i18n::convert_rfc1766($locale);
	}

	/**
	 * This action is called by the installation system
	 */
	public function successfullyinstalled() {
		// Return 410 Gone if this site is not actually a fresh installation
		if (!file_exists(BASE_PATH . '/install.php')) {
			$this->httpError(410);
		}
		// The manifest should be built by now, so it's safe to publish the 404 page
		$fourohfour = Versioned::get_one_by_stage('ErrorPage', 'Stage', '"ErrorPage"."ErrorCode" = 404');
		if($fourohfour) {
			$fourohfour->write();
			$fourohfour->publish("Stage", "Live");
		}
		
		// TODO Allow this to work when allow_url_fopen=0
		if(isset($_SESSION['StatsID']) && $_SESSION['StatsID']) {
			$url = 'http://ss2stat.silverstripe.com/Installation/installed?ID=' . $_SESSION['StatsID'];
			@file_get_contents($url);
		}
		
		global $project;
		$data = new ArrayData(array(
			'Project' => Convert::raw2xml($project),
			'Username' => Convert::raw2xml(Session::get('username')),
			'Password' => Convert::raw2xml(Session::get('password')),
		));
		
		return array(
			"Title" =>  _t("ContentController.INSTALL_SUCCESS", "Installation Successful!"),
			"Content" => $data->renderWith('Install_successfullyinstalled'),
		);
	}

	public function deleteinstallfiles() {
		if(!Permission::check("ADMIN")) return Security::permissionFailure($this);
		
		$title = new Varchar("Title");
		$content = new HTMLText('Content');

		// We can't delete index.php as it might be necessary for URL routing without mod_rewrite.
		// There's no safe way to detect usage of mod_rewrite across webservers,
		// so we have to assume the file is required.
		$installfiles = array(
			'install.php',
			'config-form.css',
			'config-form.html',
			'index.html'
		);

		$unsuccessful = new ArrayList();
		foreach($installfiles as $installfile) {
			if(file_exists(BASE_PATH . '/' . $installfile)) {
				@unlink(BASE_PATH . '/' . $installfile);
			}

			if(file_exists(BASE_PATH . '/' . $installfile)) {
				$unsuccessful->push(new ArrayData(array('File' => $installfile)));
			}
		}

		$data = new ArrayData(array(
			'Username' => Convert::raw2xml(Session::get('username')),
			'Password' => Convert::raw2xml(Session::get('password')),
			'UnsuccessfulFiles' => $unsuccessful
		));
		$content->setValue($data->renderWith('Install_deleteinstallfiles'));

		return array(
			"Title" => $title,
			"Content" => $content,
		);
	}
}
