<?php
/**
 * Contain log classes
 *
 * Copyright © 2002, 2004 Brion Vibber <brion@pobox.com>
 * http://www.mediawiki.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 2 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

/**
 * Class to simplify the use of log pages.
 * The logs are now kept in a table which is easier to manage and trim
 * than ever-growing wiki pages.
 *
 */
class LogPage {
	const DELETED_ACTION = 1;
	const DELETED_COMMENT = 2;
	const DELETED_USER = 4;
	const DELETED_RESTRICTED = 8;
	// Convenience fields
	const SUPPRESSED_USER = 12;
	const SUPPRESSED_ACTION = 9;
	/* @access private */
	var $type, $action, $comment, $params;

	/**
	 * @var User
	 */
	var $doer;

	/**
	 * @var Title
	 */
	var $target;

	/* @acess public */
	var $updateRecentChanges, $sendToUDP;

	/**
	 * Constructor
	 *
	 * @param $type String: one of '', 'block', 'protect', 'rights', 'delete',
	 *               'upload', 'move'
	 * @param $rc Boolean: whether to update recent changes as well as the logging table
	 * @param $udp String: pass 'UDP' to send to the UDP feed if NOT sent to RC
	 */
	public function __construct( $type, $rc = true, $udp = 'skipUDP' ) {
		$this->type = $type;
		$this->updateRecentChanges = $rc;
		$this->sendToUDP = ( $udp == 'UDP' );
	}

	/**
	 * @return bool|int|null
	 */
	protected function saveContent() {
		global $wgLogRestrictions;

		$dbw = wfGetDB( DB_MASTER );
		$log_id = $dbw->nextSequenceValue( 'logging_log_id_seq' );

		$this->timestamp = $now = wfTimestampNow();
		$data = array(
			'log_id' => $log_id,
			'log_type' => $this->type,
			'log_action' => $this->action,
			'log_timestamp' => $dbw->timestamp( $now ),
			'log_user' => $this->doer->getId(),
			'log_user_text' => $this->doer->getName(),
			'log_namespace' => $this->target->getNamespace(),
			'log_title' => $this->target->getDBkey(),
			'log_page' => $this->target->getArticleId(),
			'log_comment' => $this->comment,
			'log_params' => $this->params
		);
		$dbw->insert( 'logging', $data, __METHOD__ );
		$newId = !is_null( $log_id ) ? $log_id : $dbw->insertId();

		# And update recentchanges
		if( $this->updateRecentChanges ) {
			$titleObj = SpecialPage::getTitleFor( 'Log', $this->type );

			RecentChange::notifyLog(
				$now, $titleObj, $this->doer, $this->getRcComment(), '',
				$this->type, $this->action, $this->target, $this->comment,
				$this->params, $newId
			);
		} elseif( $this->sendToUDP ) {
			# Don't send private logs to UDP
			if( isset( $wgLogRestrictions[$this->type] ) && $wgLogRestrictions[$this->type] != '*' ) {
				return true;
			}

			# Notify external application via UDP.
			# We send this to IRC but do not want to add it the RC table.
			$titleObj = SpecialPage::getTitleFor( 'Log', $this->type );
			$rc = RecentChange::newLogEntry(
				$now, $titleObj, $this->doer, $this->getRcComment(), '',
				$this->type, $this->action, $this->target, $this->comment,
				$this->params, $newId
			);
			$rc->notifyRC2UDP();
		}
		return $newId;
	}

	/**
	 * Get the RC comment from the last addEntry() call
	 *
	 * @return string
	 */
	public function getRcComment() {
		$rcComment = $this->actionText;

		if( $this->comment != '' ) {
			if ( $rcComment == '' ) {
				$rcComment = $this->comment;
			} else {
				$rcComment .= wfMsgForContent( 'colon-separator' ) . $this->comment;
			}
		}

		return $rcComment;
	}

	/**
	 * Get the comment from the last addEntry() call
	 */
	public function getComment() {
		return $this->comment;
	}

	/**
	 * Get the list of valid log types
	 *
	 * @return Array of strings
	 */
	public static function validTypes() {
		global $wgLogTypes;
		return $wgLogTypes;
	}

	/**
	 * Is $type a valid log type
	 *
	 * @param $type String: log type to check
	 * @return Boolean
	 */
	public static function isLogType( $type ) {
		return in_array( $type, LogPage::validTypes() );
	}

	/**
	 * Get the name for the given log type
	 *
	 * @param $type String: logtype
	 * @return String: log name
	 * @deprecated in 1.19, warnings in 1.21. Use getName()
	 */
	public static function logName( $type ) {
		wfDeprecated( __METHOD__, '1.19' );
		global $wgLogNames;

		if( isset( $wgLogNames[$type] ) ) {
			return str_replace( '_', ' ', wfMsg( $wgLogNames[$type] ) );
		} else {
			// Bogus log types? Perhaps an extension was removed.
			return $type;
		}
	}

	/**
	 * Get the log header for the given log type
	 *
	 * @todo handle missing log types
	 * @param $type String: logtype
	 * @return String: headertext of this logtype
	 * @deprecated in 1.19, warnings in 1.21. Use getDescription()
	 */
	public static function logHeader( $type ) {
		wfDeprecated( __METHOD__, '1.19' );
		global $wgLogHeaders;
		return wfMsgExt( $wgLogHeaders[$type], array( 'parseinline' ) );
	}

	/**
	 * Generate text for a log entry. 
	 * Only LogFormatter should call this function.
	 *
	 * @param $type String: log type
	 * @param $action String: log action
	 * @param $title Mixed: Title object or null
	 * @param $skin Mixed: Skin object or null. If null, we want to use the wiki
	 *              content language, since that will go to the IRC feed.
	 * @param $params Array: parameters
	 * @param $filterWikilinks Boolean: whether to filter wiki links
	 * @return HTML string
	 */
	public static function actionText( $type, $action, $title = null, $skin = null,
		$params = array(), $filterWikilinks = false )
	{
		global $wgLang, $wgContLang, $wgLogActions;

		if ( is_null( $skin ) ) {
			$langObj = $wgContLang;
			$langObjOrNull = null;
		} else {
			$langObj = $wgLang;
			$langObjOrNull = $wgLang;
		}

		$key = "$type/$action";

		if( isset( $wgLogActions[$key] ) ) {
			if( is_null( $title ) ) {
				$rv = wfMsgExt( $wgLogActions[$key], array( 'parsemag', 'escape', 'language' => $langObj ) );
			} else {
				$titleLink = self::getTitleLink( $type, $langObjOrNull, $title, $params );

				if( preg_match( '/^rights\/(rights|autopromote)/', $key ) ) {
					$rightsnone = wfMsgExt( 'rightsnone', array( 'parsemag', 'language' => $langObj ) );

					if( $skin ) {
						foreach ( $params as &$param ) {
							$groupArray = array_map( 'trim', explode( ',', $param ) );
							$groupArray = array_map( array( 'User', 'getGroupMember' ), $groupArray );
							$param = $wgLang->listToText( $groupArray );
						}
					}

					if( !isset( $params[0] ) || trim( $params[0] ) == '' ) {
						$params[0] = $rightsnone;
					}

					if( !isset( $params[1] ) || trim( $params[1] ) == '' ) {
						$params[1] = $rightsnone;
					}
				}

				if( count( $params ) == 0 ) {
					$rv = wfMsgExt( $wgLogActions[$key], array( 'parsemag', 'escape', 'replaceafter', 'language' => $langObj ), $titleLink );
				} else {
					$details = '';
					array_unshift( $params, $titleLink );

					// User suppression
					if ( preg_match( '/^(block|suppress)\/(block|reblock)$/', $key ) ) {
						if ( $skin ) {
							$params[1] = '<span class="blockExpiry" dir="ltr" title="' . htmlspecialchars( $params[1] ). '">' .
								$wgLang->translateBlockExpiry( $params[1] ) . '</span>';
						} else {
							$params[1] = $wgContLang->translateBlockExpiry( $params[1] );
						}

						$params[2] = isset( $params[2] ) ?
							self::formatBlockFlags( $params[2], $langObj ) : '';
					// Page protections
					} elseif ( $type == 'protect' && count($params) == 3 ) {
						// Restrictions and expiries
						if( $skin ) {
							$details .= $wgLang->getDirMark() . htmlspecialchars( " {$params[1]}" );
						} else {
							$details .= " {$params[1]}";
						}

						// Cascading flag...
						if( $params[2] ) {
							$details .= ' [' . wfMsgExt( 'protect-summary-cascade', array( 'parsemag', 'language' => $langObj ) ) . ']';
						}
					}

					$rv = wfMsgExt( $wgLogActions[$key], array( 'parsemag', 'escape', 'replaceafter', 'language' => $langObj ), $params ) . $details;
				}
			}
		} else {
			global $wgLogActionsHandlers;

			if( isset( $wgLogActionsHandlers[$key] ) ) {
				$args = func_get_args();
				$rv = call_user_func_array( $wgLogActionsHandlers[$key], $args );
			} else {
				wfDebug( "LogPage::actionText - unknown action $key\n" );
				$rv = "$action";
			}
		}

		// For the perplexed, this feature was added in r7855 by Erik.
		// The feature was added because we liked adding [[$1]] in our log entries
		// but the log entries are parsed as Wikitext on RecentChanges but as HTML
		// on Special:Log. The hack is essentially that [[$1]] represented a link
		// to the title in question. The first parameter to the HTML version (Special:Log)
		// is that link in HTML form, and so this just gets rid of the ugly [[]].
		// However, this is a horrible hack and it doesn't work like you expect if, say,
		// you want to link to something OTHER than the title of the log entry.
		// The real problem, which Erik was trying to fix (and it sort-of works now) is
		// that the same messages are being treated as both wikitext *and* HTML.
		if( $filterWikilinks ) {
			$rv = str_replace( '[[', '', $rv );
			$rv = str_replace( ']]', '', $rv );
		}

		return $rv;
	}

	/**
	 * TODO document
	 * @param  $type String
	 * @param  $lang Language or null
	 * @param  $title Title
	 * @param  $params Array
	 * @return String
	 */
	protected static function getTitleLink( $type, $lang, $title, &$params ) {
		global $wgContLang, $wgUserrightsInterwikiDelimiter;

		if( !$lang ) {
			return $title->getPrefixedText();
		}

		switch( $type ) {
			case 'move':
				$titleLink = Linker::link(
					$title,
					htmlspecialchars( $title->getPrefixedText() ),
					array(),
					array( 'redirect' => 'no' )
				);

				$targetTitle = Title::newFromText( $params[0] );

				if ( !$targetTitle ) {
					# Workaround for broken database
					$params[0] = htmlspecialchars( $params[0] );
				} else {
					$params[0] = Linker::link(
						$targetTitle,
						htmlspecialchars( $params[0] )
					);
				}
				break;
			case 'block':
				if( substr( $title->getText(), 0, 1 ) == '#' ) {
					$titleLink = $title->getText();
				} else {
					// @todo Store the user identifier in the parameters
					// to make this faster for future log entries
					$id = User::idFromName( $title->getText() );
					$titleLink = Linker::userLink( $id, $title->getText() )
						. Linker::userToolLinks( $id, $title->getText(), false, Linker::TOOL_LINKS_NOBLOCK );
				}
				break;
			case 'rights':
				$text = $wgContLang->ucfirst( $title->getText() );
				$parts = explode( $wgUserrightsInterwikiDelimiter, $text, 2 );

				if ( count( $parts ) == 2 ) {
					$titleLink = WikiMap::foreignUserLink( $parts[1], $parts[0],
						htmlspecialchars( $title->getPrefixedText() ) );

					if ( $titleLink !== false ) {
						break;
					}
				}
				$titleLink = Linker::link( Title::makeTitle( NS_USER, $text ) );
				break;
			case 'merge':
				$titleLink = Linker::link(
					$title,
					$title->getPrefixedText(),
					array(),
					array( 'redirect' => 'no' )
				);
				$params[0] = Linker::link(
					Title::newFromText( $params[0] ),
					htmlspecialchars( $params[0] )
				);
				$params[1] = $lang->timeanddate( $params[1] );
				break;
			default:
				if( $title->isSpecialPage() ) {
					list( $name, $par ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );

					# Use the language name for log titles, rather than Log/X
					if( $name == 'Log' ) {
						$titleLink = '(' . Linker::link( $title, LogPage::logName( $par ) ) . ')';
					} else {
						$titleLink = Linker::link( $title );
					}
				} else {
					$titleLink = Linker::link( $title );
				}
		}

		return $titleLink;
	}

	/**
	 * Add a log entry
	 *
	 * @param $action String: one of '', 'block', 'protect', 'rights', 'delete', 'upload', 'move', 'move_redir'
	 * @param $target Title object
	 * @param $comment String: description associated
	 * @param $params Array: parameters passed later to wfMsg.* functions
	 * @param $doer User object: the user doing the action
	 *
	 * @return bool|int|null
	 * @TODO: make this use LogEntry::saveContent()
	 */
	public function addEntry( $action, $target, $comment, $params = array(), $doer = null ) {
		global $wgContLang;

		if ( !is_array( $params ) ) {
			$params = array( $params );
		}

		if ( $comment === null ) {
			$comment = '';
		}

		# Truncate for whole multibyte characters.
		$comment = $wgContLang->truncate( $comment, 255 );

		$this->action = $action;
		$this->target = $target;
		$this->comment = $comment;
		$this->params = LogPage::makeParamBlob( $params );

		if ( $doer === null ) {
			global $wgUser;
			$doer = $wgUser;
		} elseif ( !is_object( $doer ) ) {
			$doer = User::newFromId( $doer );
		}

		$this->doer = $doer;

		$logEntry = new ManualLogEntry( $this->type, $action );
		$logEntry->setTarget( $target );
		$logEntry->setPerformer( $doer );
		$logEntry->setParameters( $params );

		$formatter = LogFormatter::newFromEntry( $logEntry );
		$context = RequestContext::newExtraneousContext( $target );
		$formatter->setContext( $context );

		$this->actionText = $formatter->getPlainActionText();

		return $this->saveContent();
	}

	/**
	 * Add relations to log_search table
	 *
	 * @param $field String
	 * @param $values Array
	 * @param $logid Integer
	 * @return Boolean
	 */
	public function addRelations( $field, $values, $logid ) {
		if( !strlen( $field ) || empty( $values ) ) {
			return false; // nothing
		}

		$data = array();

		foreach( $values as $value ) {
			$data[] = array(
				'ls_field' => $field,
				'ls_value' => $value,
				'ls_log_id' => $logid
			);
		}

		$dbw = wfGetDB( DB_MASTER );
		$dbw->insert( 'log_search', $data, __METHOD__, 'IGNORE' );

		return true;
	}

	/**
	 * Create a blob from a parameter array
	 *
	 * @param $params Array
	 * @return String
	 */
	public static function makeParamBlob( $params ) {
		return implode( "\n", $params );
	}

	/**
	 * Extract a parameter array from a blob
	 *
	 * @param $blob String
	 * @return Array
	 */
	public static function extractParams( $blob ) {
		if ( $blob === '' ) {
			return array();
		} else {
			return explode( "\n", $blob );
		}
	}

	/**
	 * Convert a comma-delimited list of block log flags
	 * into a more readable (and translated) form
	 *
	 * @param $flags Flags to format
	 * @param $lang Language object to use
	 * @return String
	 */
	public static function formatBlockFlags( $flags, $lang ) {
		$flags = explode( ',', trim( $flags ) );

		if( count( $flags ) > 0 ) {
			for( $i = 0; $i < count( $flags ); $i++ ) {
				$flags[$i] = self::formatBlockFlag( $flags[$i], $lang );
			}
			return '(' . $lang->commaList( $flags ) . ')';
		} else {
			return '';
		}
	}

	/**
	 * Translate a block log flag if possible
	 *
	 * @param $flag int Flag to translate
	 * @param $lang Language object to use
	 * @return String
	 */
	public static function formatBlockFlag( $flag, $lang ) {
		static $messages = array();

		if( !isset( $messages[$flag] ) ) {
			$messages[$flag] = htmlspecialchars( $flag ); // Fallback

			// For grepping. The following core messages can be used here:
			// * block-log-flags-angry-autoblock
			// * block-log-flags-anononly
			// * block-log-flags-hiddenname
			// * block-log-flags-noautoblock
			// * block-log-flags-nocreate
			// * block-log-flags-noemail
			// * block-log-flags-nousertalk
			$msg = wfMessage( 'block-log-flags-' . $flag )->inLanguage( $lang );

			if ( $msg->exists() ) {
				$messages[$flag] = $msg->escaped();
			}
		}

		return $messages[$flag];
	}


	/**
	 * Name of the log.
	 * @return Message
	 * @since 1.19
	 */
	public function getName() {
		global $wgLogNames;

		// BC
		if ( isset( $wgLogNames[$this->type] ) ) {
			$key = $wgLogNames[$this->type];
		} else {
			$key = 'log-name-' . $this->type;
		}

		return wfMessage( $key );
	}

	/**
	 * Description of this log type.
	 * @return Message
	 * @since 1.19
	 */
	public function getDescription() {
		global $wgLogHeaders;
		// BC
		if ( isset( $wgLogHeaders[$this->type] ) ) {
			$key = $wgLogHeaders[$this->type];
		} else {
			$key = 'log-description-' . $this->type;
		}
		return wfMessage( $key );
	}

	/**
	 * Returns the right needed to read this log type.
	 * @return string
	 * @since 1.19
	 */
	public function getRestriction() {
		global $wgLogRestrictions;
		if ( isset( $wgLogRestrictions[$this->type] ) ) {
			$restriction = $wgLogRestrictions[$this->type];
		} else {
			// '' always returns true with $user->isAllowed()
			$restriction = '';
		}
		return $restriction;
	}

	/**
	 * Tells if this log is not viewable by all.
	 * @return bool
	 * @since 1.19
	 */
	public function isRestricted() {
		$restriction = $this->getRestriction();
		return $restriction !== '' && $restriction !== '*';
	}

}
