<?php
/**
 * MediaWiki is the to-be base class for this whole project
 */

class MediaWiki {

	var $GET; /* Stores the $_GET variables at time of creation, can be changed */
	var $params = array();
	
	/**
	 * Constructor
	 */
	function MediaWiki () {
		$this->GET = $_GET;
	}
	
	/**
	 * Stores key/value pairs to circumvent global variables
	 * Note that keys are case-insensitive!
	 */
	function setVal( $key, &$value ) {
		$key = strtolower( $key );
		$this->params[$key] =& $value;
	}
	
	/**
	 * Retieves key/value pairs to circumvent global variables
	 * Note that keys are case-insensitive!
	 */
	function getVal( $key, $default = "" ) {
		$key = strtolower( $key );
		if( isset( $this->params[$key] ) ) {
			return $this->params[$key];
		}
		return $default;
	}
	
	/**
	 * Initialization of ... everything
	 @return Article either the object to become $wgArticle, or NULL
	 */
	function initialize ( &$title, &$output, &$user, $request) {
		wfProfileIn( 'MediaWiki::initialize' );
		$this->preliminaryChecks ( $title, $output, $request ) ;
		$article = NULL;
		if ( !$this->initializeSpecialCases( $title, $output, $request ) ) {
			$article = $this->initializeArticle( $title, $request );
			$this->performAction( $output, $article, $title, $user, $request );
		}
		wfProfileOut( 'MediaWiki::initialize' );
		return $article;
	}
	
	/**
	 * Checks some initial queries
	 * Note that $title here is *not* a Title object, but a string!
	 */
	function checkInitialQueries( $title,$action,&$output,$request, $lang) {
		if ($request->getVal( 'printable' ) == 'yes') {
			$output->setPrintable();
		}
		
		$ret = NULL ;
		
		
		if ( '' == $title && 'delete' != $action ) {
			$ret = Title::newFromText( wfMsgForContent( 'mainpage' ) );
		} elseif ( $curid = $request->getInt( 'curid' ) ) {
			# URLs like this are generated by RC, because rc_title isn't always accurate
			$ret = Title::newFromID( $curid );
		} else {
			$ret = Title::newFromURL( $title );
			/* check variant links so that interwiki links don't have to worry about
			   the possible different language variants
			*/
			if( count($lang->getVariants()) > 1 && !is_null($ret) && $ret->getArticleID() == 0 )
				$lang->findVariantLink( $title, $ret );
		
		}
		return $ret ;
	}
	
	/**
	 * Checks for search query and anon-cannot-read case
	 */
	function preliminaryChecks ( &$title, &$output, $request ) {
	
		# Debug statement for user levels
		// print_r($wgUser);
		
		$search = $request->getText( 'search' );
		if( !is_null( $search ) && $search !== '' ) {
			// Compatibility with old search URLs which didn't use Special:Search
			// Do this above the read whitelist check for security...
			$title = Title::makeTitle( NS_SPECIAL, 'Search' );
		}
		$this->setVal( "Search", $search );

		# If the user is not logged in, the Namespace:title of the article must be in
		# the Read array in order for the user to see it. (We have to check here to
		# catch special pages etc. We check again in Article::view())
		if ( !is_null( $title ) && !$title->userCanRead() ) {
			$output->loginToUse();
			$output->output();
			exit;
		}
		
	}
	
	/**
	 * Initialize the object to be known as $wgArticle for special cases
	 */
	function initializeSpecialCases ( &$title, &$output, $request ) {

		wfProfileIn( 'MediaWiki::initializeSpecialCases' );
		
		$search = $this->getVal('Search');
		$action = $this->getVal('Action');
		if( !$this->getVal('DisableInternalSearch') && !is_null( $search ) && $search !== '' ) {
			require_once( 'includes/SpecialSearch.php' );
			$title = Title::makeTitle( NS_SPECIAL, 'Search' );
			wfSpecialSearch();
		} else if( !$title or $title->getDBkey() == '' ) {
			$title = Title::newFromText( wfMsgForContent( 'badtitle' ) );
			$output->errorpage( 'badtitle', 'badtitletext' );
		} else if ( $title->getInterwiki() != '' ) {
			if( $rdfrom = $request->getVal( 'rdfrom' ) ) {
				$url = $title->getFullURL( 'rdfrom=' . urlencode( $rdfrom ) );
			} else {
				$url = $title->getFullURL();
			}
			/* Check for a redirect loop */
			if ( !preg_match( '/^' . preg_quote( $this->getVal('Server'), '/' ) . '/', $url ) && $title->isLocal() ) {
				$output->redirect( $url );
			} else {
				$title = Title::newFromText( wfMsgForContent( 'badtitle' ) );
				$output->errorpage( 'badtitle', 'badtitletext' );
			}
		} else if ( ( $action == 'view' ) &&
			(!isset( $this->GET['title'] ) || $title->getPrefixedDBKey() != $this->GET['title'] ) &&
			!count( array_diff( array_keys( $this->GET ), array( 'action', 'title' ) ) ) )
		{
			/* Redirect to canonical url, make it a 301 to allow caching */
			$output->setSquidMaxage( 1200 );
			$output->redirect( $title->getFullURL(), '301');
		} else if ( NS_SPECIAL == $title->getNamespace() ) {
			/* actions that need to be made when we have a special pages */
			SpecialPage::executePath( $title );
		} else {
			/* No match to special cases */
			wfProfileOut( 'MediaWiki::initializeSpecialCases' );
			return false;
		}
		/* Did match a special case */
		wfProfileOut( 'MediaWiki::initializeSpecialCases' );
		return true;
	}

	/**
	 * Initialize the object to be known as $wgArticle for "standard" actions
	 */
	function initializeArticle( &$title, $request ) {

		wfProfileIn( 'MediaWiki::initializeArticle' );
		
		$action = $this->getVal('Action');

		if( NS_MEDIA == $title->getNamespace() ) {
			$title = Title::makeTitle( NS_IMAGE, $title->getDBkey() );
		}
	
		$ns = $title->getNamespace();
	
		/* Namespace might change when using redirects */
		$article = new Article( $title );
		if( $action == 'view' && !$request->getVal( 'oldid' ) ) {
			$rTitle = Title::newFromRedirect( $article->fetchContent() );
			if( $rTitle ) {
				/* Reload from the page pointed to later */
				$article->mContentLoaded = false;
				$ns = $rTitle->getNamespace();
				$wasRedirected = true;
				}
		}

		/* Categories and images are handled by a different class */
		if( $ns == NS_IMAGE ) {
			$b4 = $title->getPrefixedText();
			unset( $article );
			require_once( 'includes/ImagePage.php' );
			$article = new ImagePage( $title );
			if( isset( $wasRedirected ) && $request->getVal( 'redirect' ) != 'no' ) {
				$article->mTitle = $rTitle;
				$article->mRedirectedFrom = $b4;
			}
		} elseif( $ns == NS_CATEGORY ) {
			unset( $article );
			require_once( 'includes/CategoryPage.php' );
			$article = new CategoryPage( $title );
		}
		wfProfileOut( 'MediaWiki::initializeArticle' );
		return $article;
	}

	/**
	 * Cleaning up by doing deferred updates, calling loadbalancer and doing the output
	 */
	function finalCleanup ( &$deferredUpdates, &$loadBalancer, &$output ) {
		wfProfileIn( 'MediaWiki::finalCleanup' );
		$this->doUpdates( $deferredUpdates );
		$loadBalancer->saveMasterPos();
		# Now commit any transactions, so that unreported errors after output() don't roll back the whole thing
		$loadBalancer->commitAll();
		$output->output();
		wfProfileOut( 'MediaWiki::finalCleanup' );
	}

	/**
	 * Deferred updates aren't really deferred anymore. It's important to report errors to the
	 * user, and that means doing this before OutputPage::output(). Note that for page saves,
	 * the client will wait until the script exits anyway before following the redirect.
	 */
	function doUpdates ( &$updates ) {
		wfProfileIn( 'MediaWiki::doUpdates' );
		foreach( $updates as $up ) {
			$up->doUpdate();
		}
		wfProfileOut( 'MediaWiki::doUpdates' );		
	}
	
	/**
	 * Ends this task peacefully
	 */
	function restInPeace ( &$loadBalancer ) {
		wfProfileClose();
		logProfilingData();
		$loadBalancer->closeAll();
		wfDebug( "Request ended normally\n" );
	}

	/**
	 * Perform one of the "standard" actions
	 */
	function performAction( &$output, &$article, &$title, &$user, &$request ) {

		wfProfileIn( 'MediaWiki::performAction' );

		$action = $this->getVal('Action');
		if( in_array( $action, $this->getVal('DisabledActions',array()) ) ) {
			/* No such action; this will switch to the default case */
			$action = "nosuchaction"; 
		}

		switch( $action ) {
			case 'view':
				$output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
				$article->view();
				break;
			case 'watch':
			case 'unwatch':
			case 'delete':
			case 'revert':
			case 'rollback':
			case 'protect':
			case 'unprotect':
			case 'info':
			case 'markpatrolled':
			case 'validate':
			case 'render':
			case 'deletetrackback':
			case 'purge':
				$article->$action();
				break;
			case 'print':
				$article->view();
				break;
			case 'dublincore':
				if( !$this->getVal( 'EnableDublinCoreRdf' ) ) {
					wfHttpError( 403, 'Forbidden', wfMsg( 'nodublincore' ) );
				} else {
					require_once( 'includes/Metadata.php' );
					wfDublinCoreRdf( $article );
				}
				break;
			case 'creativecommons':
				if( !$this->getVal( 'EnableCreativeCommonsRdf' ) ) {
					wfHttpError( 403, 'Forbidden', wfMsg( 'nocreativecommons' ) );
				} else {
					require_once( 'includes/Metadata.php' );
					wfCreativeCommonsRdf( $article );
				}
				break;
			case 'credits':
				require_once( 'includes/Credits.php' );
				showCreditsPage( $article );
				break;
			case 'submit':
				if( !$this->getVal( 'CommandLineMode' ) && !$request->checkSessionCookie() ) {
					/* Send a cookie so anons get talk message notifications */
					User::SetupSession();
				}
				/* Continue... */
			case 'edit':
				$internal = $request->getVal( 'internaledit' );
				$external = $request->getVal( 'externaledit' );
				$section = $request->getVal( 'section' );
				$oldid = $request->getVal( 'oldid' );
				if( !$this->getVal( 'UseExternalEditor' ) || $action=='submit' || $internal ||
				   $section || $oldid || ( !$user->getOption( 'externaleditor' ) && !$external ) ) {
					require_once( 'includes/EditPage.php' );
					$editor = new EditPage( $article );
					$editor->submit();
				} elseif( $this->getVal( 'UseExternalEditor' ) && ( $external || $user->getOption( 'externaleditor' ) ) ) {
					require_once( 'includes/ExternalEdit.php' );
					$mode = $request->getVal( 'mode' );
					$extedit = new ExternalEdit( $article, $mode );
					$extedit->edit();
				}
				break;
			case 'history':
				if( $_SERVER['REQUEST_URI'] == $title->getInternalURL( 'action=history' ) ) {
					$output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
				}
				require_once( 'includes/PageHistory.php' );
				$history = new PageHistory( $article );
				$history->history();
				break;
			case 'raw':
				require_once( 'includes/RawPage.php' );
				$raw = new RawPage( $article );
				$raw->view();
				break;
			default:
				if( wfRunHooks( 'UnknownAction', array( $action, $article ) ) ) {
					$output->errorpage( 'nosuchaction', 'nosuchactiontext' );
				}
		wfProfileOut( 'MediaWiki::performAction' );
	}

	
	}

}; /* End of class MediaWiki */

?>