SpecialWatchlist.php

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<?php
use MediaWiki\MediaWikiServices;
use Wikimedia\Rdbms\IResultWrapper;
use Wikimedia\Rdbms\IDatabase;
 
class SpecialWatchlist extends ChangesListSpecialPage {
    protected static $savedQueriesPreferenceName = 'rcfilters-wl-saved-queries';
    protected static $daysPreferenceName = 'watchlistdays';
    protected static $limitPreferenceName = 'wllimit';
    protected static $collapsedPreferenceName = 'rcfilters-wl-collapsed';
 
    private $maxDays;
 
    public function __construct( $page = 'Watchlist', $restriction = 'viewmywatchlist' ) {
        parent::__construct( $page, $restriction );
 
        $this->maxDays = $this->getConfig()->get( 'RCMaxAge' ) / ( 3600 * 24 );
    }
 
    public function doesWrites() {
        return true;
    }
 
    function execute( $subpage ) {
        // Anons don't get a watchlist
        $this->requireLogin( 'watchlistanontext' );
 
        $output = $this->getOutput();
        $request = $this->getRequest();
        $this->addHelpLink( 'Help:Watching pages' );
        $output->addModuleStyles( [ 'mediawiki.special' ] );
        $output->addModules( [
            'mediawiki.special.watchlist',
        ] );
 
        $mode = SpecialEditWatchlist::getMode( $request, $subpage );
        if ( $mode !== false ) {
            if ( $mode === SpecialEditWatchlist::EDIT_RAW ) {
                $title = SpecialPage::getTitleFor( 'EditWatchlist', 'raw' );
            } elseif ( $mode === SpecialEditWatchlist::EDIT_CLEAR ) {
                $title = SpecialPage::getTitleFor( 'EditWatchlist', 'clear' );
            } else {
                $title = SpecialPage::getTitleFor( 'EditWatchlist' );
            }
 
            $output->redirect( $title->getLocalURL() );
 
            return;
        }
 
        $this->checkPermissions();
 
        $user = $this->getUser();
        $opts = $this->getOptions();
 
        $config = $this->getConfig();
        if ( ( $config->get( 'EnotifWatchlist' ) || $config->get( 'ShowUpdatedMarker' ) )
            && $request->getVal( 'reset' )
            && $request->wasPosted()
            && $user->matchEditToken( $request->getVal( 'token' ) )
        ) {
            $user->clearAllNotifications();
            $output->redirect( $this->getPageTitle()->getFullURL( $opts->getChangedValues() ) );
 
            return;
        }
 
        parent::execute( $subpage );
 
        if ( $this->isStructuredFilterUiEnabled() ) {
            $output->addModuleStyles( [ 'mediawiki.rcfilters.highlightCircles.seenunseen.styles' ] );
 
            $output->addJsConfigVars(
                'wgStructuredChangeFiltersEditWatchlistUrl',
                SpecialPage::getTitleFor( 'EditWatchlist' )->getLocalURL()
            );
        }
    }
 
    public static function checkStructuredFilterUiEnabled( Config $config, User $user ) {
        return !$user->getOption( 'wlenhancedfilters-disable' );
    }
 
    public function getSubpagesForPrefixSearch() {
        return [
            'clear',
            'edit',
            'raw',
        ];
    }
 
    protected function transformFilterDefinition( array $filterDefinition ) {
        if ( isset( $filterDefinition['showHideSuffix'] ) ) {
            $filterDefinition['showHide'] = 'wl' . $filterDefinition['showHideSuffix'];
        }
 
        return $filterDefinition;
    }
 
    protected function registerFilters() {
        parent::registerFilters();
 
        // legacy 'extended' filter
        $this->registerFilterGroup( new ChangesListBooleanFilterGroup( [
            'name' => 'extended-group',
            'filters' => [
                [
                    'name' => 'extended',
                    'isReplacedInStructuredUi' => true,
                    'activeValue' => false,
                    'default' => $this->getUser()->getBoolOption( 'extendwatchlist' ),
                    'queryCallable' => function ( $specialClassName, $ctx, $dbr, &$tables,
                                                  &$fields, &$conds, &$query_options, &$join_conds ) {
                        $nonRevisionTypes = [ RC_LOG ];
                        Hooks::run( 'SpecialWatchlistGetNonRevisionTypes', [ &$nonRevisionTypes ] );
                        if ( $nonRevisionTypes ) {
                            $conds[] = $dbr->makeList(
                                [
                                    'rc_this_oldid=page_latest',
                                    'rc_type' => $nonRevisionTypes,
                                ],
                                LIST_OR
                            );
                        }
                    },
                ]
            ],
 
        ] ) );
 
        if ( $this->isStructuredFilterUiEnabled() ) {
            $this->getFilterGroup( 'lastRevision' )
                ->getFilter( 'hidepreviousrevisions' )
                ->setDefault( !$this->getUser()->getBoolOption( 'extendwatchlist' ) );
        }
 
        $this->registerFilterGroup( new ChangesListStringOptionsFilterGroup( [
            'name' => 'watchlistactivity',
            'title' => 'rcfilters-filtergroup-watchlistactivity',
            'class' => ChangesListStringOptionsFilterGroup::class,
            'priority' => 3,
            'isFullCoverage' => true,
            'filters' => [
                [
                    'name' => 'unseen',
                    'label' => 'rcfilters-filter-watchlistactivity-unseen-label',
                    'description' => 'rcfilters-filter-watchlistactivity-unseen-description',
                    'cssClassSuffix' => 'watchedunseen',
                    'isRowApplicableCallable' => function ( $ctx, $rc ) {
                        $changeTs = $rc->getAttribute( 'rc_timestamp' );
                        $lastVisitTs = $rc->getAttribute( 'wl_notificationtimestamp' );
                        return $lastVisitTs !== null && $changeTs >= $lastVisitTs;
                    },
                ],
                [
                    'name' => 'seen',
                    'label' => 'rcfilters-filter-watchlistactivity-seen-label',
                    'description' => 'rcfilters-filter-watchlistactivity-seen-description',
                    'cssClassSuffix' => 'watchedseen',
                    'isRowApplicableCallable' => function ( $ctx, $rc ) {
                        $changeTs = $rc->getAttribute( 'rc_timestamp' );
                        $lastVisitTs = $rc->getAttribute( 'wl_notificationtimestamp' );
                        return $lastVisitTs === null || $changeTs < $lastVisitTs;
                    }
                ],
            ],
            'default' => ChangesListStringOptionsFilterGroup::NONE,
            'queryCallable' => function ( $specialPageClassName, $context, $dbr,
                                          &$tables, &$fields, &$conds, &$query_options, &$join_conds, $selectedValues ) {
                if ( $selectedValues === [ 'seen' ] ) {
                    $conds[] = $dbr->makeList( [
                        'wl_notificationtimestamp IS NULL',
                        'rc_timestamp < wl_notificationtimestamp'
                    ], LIST_OR );
                } elseif ( $selectedValues === [ 'unseen' ] ) {
                    $conds[] = $dbr->makeList( [
                        'wl_notificationtimestamp IS NOT NULL',
                        'rc_timestamp >= wl_notificationtimestamp'
                    ], LIST_AND );
                }
            }
        ] ) );
 
        $user = $this->getUser();
 
        $significance = $this->getFilterGroup( 'significance' );
        $hideMinor = $significance->getFilter( 'hideminor' );
        $hideMinor->setDefault( $user->getBoolOption( 'watchlisthideminor' ) );
 
        $automated = $this->getFilterGroup( 'automated' );
        $hideBots = $automated->getFilter( 'hidebots' );
        $hideBots->setDefault( $user->getBoolOption( 'watchlisthidebots' ) );
 
        $registration = $this->getFilterGroup( 'registration' );
        $hideAnons = $registration->getFilter( 'hideanons' );
        $hideAnons->setDefault( $user->getBoolOption( 'watchlisthideanons' ) );
        $hideLiu = $registration->getFilter( 'hideliu' );
        $hideLiu->setDefault( $user->getBoolOption( 'watchlisthideliu' ) );
 
        // Selecting both hideanons and hideliu on watchlist preferances
        // gives mutually exclusive filters, so those are ignored
        if ( $user->getBoolOption( 'watchlisthideanons' ) &&
            !$user->getBoolOption( 'watchlisthideliu' )
        ) {
            $this->getFilterGroup( 'userExpLevel' )
                ->setDefault( 'registered' );
        }
 
        if ( $user->getBoolOption( 'watchlisthideliu' ) &&
            !$user->getBoolOption( 'watchlisthideanons' )
        ) {
            $this->getFilterGroup( 'userExpLevel' )
                ->setDefault( 'unregistered' );
        }
 
        $reviewStatus = $this->getFilterGroup( 'reviewStatus' );
        if ( $reviewStatus !== null ) {
            // Conditional on feature being available and rights
            if ( $user->getBoolOption( 'watchlisthidepatrolled' ) ) {
                $reviewStatus->setDefault( 'unpatrolled' );
                $legacyReviewStatus = $this->getFilterGroup( 'legacyReviewStatus' );
                $legacyHidePatrolled = $legacyReviewStatus->getFilter( 'hidepatrolled' );
                $legacyHidePatrolled->setDefault( true );
            }
        }
 
        $authorship = $this->getFilterGroup( 'authorship' );
        $hideMyself = $authorship->getFilter( 'hidemyself' );
        $hideMyself->setDefault( $user->getBoolOption( 'watchlisthideown' ) );
 
        $changeType = $this->getFilterGroup( 'changeType' );
        $hideCategorization = $changeType->getFilter( 'hidecategorization' );
        if ( $hideCategorization !== null ) {
            // Conditional on feature being available
            $hideCategorization->setDefault( $user->getBoolOption( 'watchlisthidecategorization' ) );
        }
    }
 
    protected function fetchOptionsFromRequest( $opts ) {
        static $compatibilityMap = [
            'hideMinor' => 'hideminor',
            'hideBots' => 'hidebots',
            'hideAnons' => 'hideanons',
            'hideLiu' => 'hideliu',
            'hidePatrolled' => 'hidepatrolled',
            'hideOwn' => 'hidemyself',
        ];
 
        $params = $this->getRequest()->getValues();
        foreach ( $compatibilityMap as $from => $to ) {
            if ( isset( $params[$from] ) ) {
                $params[$to] = $params[$from];
                unset( $params[$from] );
            }
        }
 
        if ( $this->getRequest()->getVal( 'action' ) == 'submit' ) {
            $allBooleansFalse = [];
 
            // If the user submitted the form, start with a baseline of "all
            // booleans are false", then change the ones they checked.  This
            // means we ignore the defaults.
 
            // This is how we handle the fact that HTML forms don't submit
            // unchecked boxes.
            foreach ( $this->getLegacyShowHideFilters() as $filter ) {
                $allBooleansFalse[ $filter->getName() ] = false;
            }
 
            $params = $params + $allBooleansFalse;
        }
 
        // Not the prettiest way to achieve this… FormOptions internally depends on data sanitization
        // methods defined on WebRequest and removing this dependency would cause some code duplication.
        $request = new DerivativeRequest( $this->getRequest(), $params );
        $opts->fetchValuesFromRequest( $request );
 
        return $opts;
    }
 
    protected function doMainQuery( $tables, $fields, $conds, $query_options,
        $join_conds, FormOptions $opts
    ) {
        $dbr = $this->getDB();
        $user = $this->getUser();
 
        $rcQuery = RecentChange::getQueryInfo();
        $tables = array_merge( $tables, $rcQuery['tables'], [ 'watchlist' ] );
        $fields = array_merge( $rcQuery['fields'], $fields );
 
        $join_conds = array_merge(
            [
                'watchlist' => [
                    'INNER JOIN',
                    [
                        'wl_user' => $user->getId(),
                        'wl_namespace=rc_namespace',
                        'wl_title=rc_title'
                    ],
                ],
            ],
            $rcQuery['joins'],
            $join_conds
        );
 
        $tables[] = 'page';
        $fields[] = 'page_latest';
        $join_conds['page'] = [ 'LEFT JOIN', 'rc_cur_id=page_id' ];
 
        $fields[] = 'wl_notificationtimestamp';
 
        // Log entries with DELETED_ACTION must not show up unless the user has
        // the necessary rights.
        if ( !$user->isAllowed( 'deletedhistory' ) ) {
            $bitmask = LogPage::DELETED_ACTION;
        } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
            $bitmask = LogPage::DELETED_ACTION | LogPage::DELETED_RESTRICTED;
        } else {
            $bitmask = 0;
        }
        if ( $bitmask ) {
            $conds[] = $dbr->makeList( [
                'rc_type != ' . RC_LOG,
                $dbr->bitAnd( 'rc_deleted', $bitmask ) . " != $bitmask",
            ], LIST_OR );
        }
 
        $tagFilter = $opts['tagfilter'] ? explode( '|', $opts['tagfilter'] ) : [];
        ChangeTags::modifyDisplayQuery(
            $tables,
            $fields,
            $conds,
            $join_conds,
            $query_options,
            $tagFilter
        );
 
        $this->runMainQueryHook( $tables, $fields, $conds, $query_options, $join_conds, $opts );
 
        if ( $this->areFiltersInConflict() ) {
            return false;
        }
 
        $orderByAndLimit = [
            'ORDER BY' => 'rc_timestamp DESC',
            'LIMIT' => $opts['limit']
        ];
        if ( in_array( 'DISTINCT', $query_options ) ) {
            // ChangeTags::modifyDisplayQuery() adds DISTINCT when filtering on multiple tags.
            // In order to prevent DISTINCT from causing query performance problems,
            // we have to GROUP BY the primary key. This in turn requires us to add
            // the primary key to the end of the ORDER BY, and the old ORDER BY to the
            // start of the GROUP BY
            $orderByAndLimit['ORDER BY'] = 'rc_timestamp DESC, rc_id DESC';
            $orderByAndLimit['GROUP BY'] = 'rc_timestamp, rc_id';
        }
        // array_merge() is used intentionally here so that hooks can, should
        // they so desire, override the ORDER BY / LIMIT condition(s)
        $query_options = array_merge( $orderByAndLimit, $query_options );
 
        return $dbr->select(
            $tables,
            $fields,
            $conds,
            __METHOD__,
            $query_options,
            $join_conds
        );
    }
 
    protected function getDB() {
        return wfGetDB( DB_REPLICA, 'watchlist' );
    }
 
    public function outputFeedLinks() {
        $user = $this->getUser();
        $wlToken = $user->getTokenFromOption( 'watchlisttoken' );
        if ( $wlToken ) {
            $this->addFeedLinks( [
                'action' => 'feedwatchlist',
                'allrev' => 1,
                'wlowner' => $user->getName(),
                'wltoken' => $wlToken,
            ] );
        }
    }
 
    public function outputChangesList( $rows, $opts ) {
        $dbr = $this->getDB();
        $user = $this->getUser();
        $output = $this->getOutput();
        $services = MediaWikiServices::getInstance();
 
        # Show a message about replica DB lag, if applicable
        $lag = $services->getDBLoadBalancer()->safeGetLag( $dbr );
        if ( $lag > 0 ) {
            $output->showLagWarning( $lag );
        }
 
        # If no rows to display, show message before try to render the list
        if ( $rows->numRows() == 0 ) {
            $output->wrapWikiMsg(
                "<div class='mw-changeslist-empty'>\n$1\n</div>", 'recentchanges-noresult'
            );
            return;
        }
 
        $dbr->dataSeek( $rows, 0 );
 
        $list = ChangesList::newFromContext( $this->getContext(), $this->filterGroups );
        $list->setWatchlistDivs();
        $list->initChangesListRows( $rows );
        if ( $user->getOption( 'watchlistunwatchlinks' ) ) {
            $list->setChangeLinePrefixer( function ( RecentChange $rc, ChangesList $cl, $grouped ) {
                // Don't show unwatch link if the line is a grouped log entry using EnhancedChangesList,
                // since EnhancedChangesList groups log entries by performer rather than by target article
                if ( $rc->mAttribs['rc_type'] == RC_LOG && $cl instanceof EnhancedChangesList &&
                    $grouped ) {
                    return '';
                } else {
                    return $this->getLinkRenderer()
                            ->makeKnownLink( $rc->getTitle(),
                                $this->msg( 'watchlist-unwatch' )->text(), [
                                    'class' => 'mw-unwatch-link',
                                    'title' => $this->msg( 'tooltip-ca-unwatch' )->text()
                                ], [ 'action' => 'unwatch' ] ) . "\u{00A0}";
                }
            } );
        }
        $dbr->dataSeek( $rows, 0 );
 
        if ( $this->getConfig()->get( 'RCShowWatchingUsers' )
            && $user->getOption( 'shownumberswatching' )
        ) {
            $watchedItemStore = $services->getWatchedItemStore();
        }
 
        $s = $list->beginRecentChangesList();
 
        if ( $this->isStructuredFilterUiEnabled() ) {
            $s .= $this->makeLegend();
        }
 
        $userShowHiddenCats = $this->getUser()->getBoolOption( 'showhiddencats' );
        $counter = 1;
        foreach ( $rows as $obj ) {
            # Make RC entry
            $rc = RecentChange::newFromRow( $obj );
 
            # Skip CatWatch entries for hidden cats based on user preference
            if (
                $rc->getAttribute( 'rc_type' ) == RC_CATEGORIZE &&
                !$userShowHiddenCats &&
                $rc->getParam( 'hidden-cat' )
            ) {
                continue;
            }
 
            $rc->counter = $counter++;
 
            if ( $this->getConfig()->get( 'ShowUpdatedMarker' ) ) {
                $updated = $obj->wl_notificationtimestamp;
            } else {
                $updated = false;
            }
 
            if ( isset( $watchedItemStore ) ) {
                $rcTitleValue = new TitleValue( (int)$obj->rc_namespace, $obj->rc_title );
                $rc->numberofWatchingusers = $watchedItemStore->countWatchers( $rcTitleValue );
            } else {
                $rc->numberofWatchingusers = 0;
            }
 
            $changeLine = $list->recentChangesLine( $rc, $updated, $counter );
            if ( $changeLine !== false ) {
                $s .= $changeLine;
            }
        }
        $s .= $list->endRecentChangesList();
 
        $output->addHTML( $s );
    }
 
    public function doHeader( $opts, $numRows ) {
        $user = $this->getUser();
        $out = $this->getOutput();
 
        $out->addSubtitle(
            $this->msg( 'watchlistfor2', $user->getName() )
                ->rawParams( SpecialEditWatchlist::buildTools(
                    $this->getLanguage(),
                    $this->getLinkRenderer()
                ) )
        );
 
        $this->setTopText( $opts );
 
        $form = '';
 
        $form .= Xml::openElement( 'form', [
            'method' => 'get',
            'action' => wfScript(),
            'id' => 'mw-watchlist-form'
        ] );
        $form .= Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() );
        $form .= Xml::openElement(
            'fieldset',
            [ 'id' => 'mw-watchlist-options', 'class' => 'cloptions' ]
        );
        $form .= Xml::element(
            'legend', null, $this->msg( 'watchlist-options' )->text()
        );
 
        if ( !$this->isStructuredFilterUiEnabled() ) {
            $form .= $this->makeLegend();
        }
 
        $lang = $this->getLanguage();
        $timestamp = wfTimestampNow();
        $wlInfo = Html::rawElement(
            'span',
            [
                'class' => 'wlinfo',
                'data-params' => json_encode( [ 'from' => $timestamp ] ),
            ],
            $this->msg( 'wlnote' )->numParams( $numRows, round( $opts['days'] * 24 ) )->params(
                $lang->userDate( $timestamp, $user ), $lang->userTime( $timestamp, $user )
            )->parse()
        ) . "<br />\n";
 
        $nondefaults = $opts->getChangedValues();
        $cutofflinks = Html::rawElement(
            'span',
            [ 'class' => 'cldays cloption' ],
            $this->msg( 'wlshowtime' ) . ' ' . $this->cutoffselector( $opts )
        );
 
        # Spit out some control panel links
        $links = [];
        $namesOfDisplayedFilters = [];
        foreach ( $this->getLegacyShowHideFilters() as $filterName => $filter ) {
            $namesOfDisplayedFilters[] = $filterName;
            $links[] = $this->showHideCheck(
                $nondefaults,
                $filter->getShowHide(),
                $filterName,
                $opts[ $filterName ],
                $filter->isFeatureAvailableOnStructuredUi( $this )
            );
        }
 
        $hiddenFields = $nondefaults;
        $hiddenFields['action'] = 'submit';
        unset( $hiddenFields['namespace'] );
        unset( $hiddenFields['invert'] );
        unset( $hiddenFields['associated'] );
        unset( $hiddenFields['days'] );
        foreach ( $namesOfDisplayedFilters as $filterName ) {
            unset( $hiddenFields[$filterName] );
        }
 
        # Namespace filter and put the whole form together.
        $form .= $wlInfo;
        $form .= $cutofflinks;
        $form .= Html::rawElement(
            'span',
            [ 'class' => 'clshowhide' ],
            $this->msg( 'watchlist-hide' ) .
            $this->msg( 'colon-separator' )->escaped() .
            implode( ' ', $links )
        );
        $form .= "\n<br />\n";
 
        $namespaceForm = Html::namespaceSelector(
            [
                'selected' => $opts['namespace'],
                'all' => '',
                'label' => $this->msg( 'namespace' )->text()
            ], [
                'name' => 'namespace',
                'id' => 'namespace',
                'class' => 'namespaceselector',
            ]
        ) . "\n";
        $namespaceForm .= '<span class="mw-input-with-label">' . Xml::checkLabel(
            $this->msg( 'invert' )->text(),
            'invert',
            'nsinvert',
            $opts['invert'],
            [ 'title' => $this->msg( 'tooltip-invert' )->text() ]
        ) . "</span>\n";
        $namespaceForm .= '<span class="mw-input-with-label">' . Xml::checkLabel(
            $this->msg( 'namespace_association' )->text(),
            'associated',
            'nsassociated',
            $opts['associated'],
            [ 'title' => $this->msg( 'tooltip-namespace_association' )->text() ]
        ) . "</span>\n";
        $form .= Html::rawElement(
            'span',
            [ 'class' => 'namespaceForm cloption' ],
            $namespaceForm
        );
 
        $form .= Xml::submitButton(
            $this->msg( 'watchlist-submit' )->text(),
            [ 'class' => 'cloption-submit' ]
        ) . "\n";
        foreach ( $hiddenFields as $key => $value ) {
            $form .= Html::hidden( $key, $value ) . "\n";
        }
        $form .= Xml::closeElement( 'fieldset' ) . "\n";
        $form .= Xml::closeElement( 'form' ) . "\n";
 
        // Insert a placeholder for RCFilters
        if ( $this->isStructuredFilterUiEnabled() ) {
            $rcfilterContainer = Html::element(
                'div',
                [ 'class' => 'rcfilters-container' ]
            );
 
            $loadingContainer = Html::rawElement(
                'div',
                [ 'class' => 'rcfilters-spinner' ],
                Html::element(
                    'div',
                    [ 'class' => 'rcfilters-spinner-bounce' ]
                )
            );
 
            // Wrap both with rcfilters-head
            $this->getOutput()->addHTML(
                Html::rawElement(
                    'div',
                    [ 'class' => 'rcfilters-head' ],
                    $rcfilterContainer . $form
                )
            );
 
            // Add spinner
            $this->getOutput()->addHTML( $loadingContainer );
        } else {
            $this->getOutput()->addHTML( $form );
        }
 
        $this->setBottomText( $opts );
    }
 
    function cutoffselector( $options ) {
        $selected = (float)$options['days'];
        if ( $selected <= 0 ) {
            $selected = $this->maxDays;
        }
 
        $selectedHours = round( $selected * 24 );
 
        $hours = array_unique( array_filter( [
            1,
            2,
            6,
            12,
            24,
            72,
            168,
            24 * (float)$this->getUser()->getOption( 'watchlistdays', 0 ),
            24 * $this->maxDays,
            $selectedHours
        ] ) );
        asort( $hours );
 
        $select = new XmlSelect( 'days', 'days', (float)( $selectedHours / 24 ) );
 
        foreach ( $hours as $value ) {
            if ( $value < 24 ) {
                $name = $this->msg( 'hours' )->numParams( $value )->text();
            } else {
                $name = $this->msg( 'days' )->numParams( $value / 24 )->text();
            }
            $select->addOption( $name, (float)( $value / 24 ) );
        }
 
        return $select->getHTML() . "\n<br />\n";
    }
 
    function setTopText( FormOptions $opts ) {
        $nondefaults = $opts->getChangedValues();
        $form = '';
        $user = $this->getUser();
 
        $numItems = $this->countItems();
        $showUpdatedMarker = $this->getConfig()->get( 'ShowUpdatedMarker' );
 
        // Show watchlist header
        $watchlistHeader = '';
        if ( $numItems == 0 ) {
            $watchlistHeader = $this->msg( 'nowatchlist' )->parse();
        } else {
            $watchlistHeader .= $this->msg( 'watchlist-details' )->numParams( $numItems )->parse() . "\n";
            if ( $this->getConfig()->get( 'EnotifWatchlist' )
                && $user->getOption( 'enotifwatchlistpages' )
            ) {
                $watchlistHeader .= $this->msg( 'wlheader-enotif' )->parse() . "\n";
            }
            if ( $showUpdatedMarker ) {
                $watchlistHeader .= $this->msg(
                    $this->isStructuredFilterUiEnabled() ?
                        'rcfilters-watchlist-showupdated' :
                        'wlheader-showupdated'
                )->parse() . "\n";
            }
        }
        $form .= Html::rawElement(
            'div',
            [ 'class' => 'watchlistDetails' ],
            $watchlistHeader
        );
 
        if ( $numItems > 0 && $showUpdatedMarker ) {
            $form .= Xml::openElement( 'form', [ 'method' => 'post',
                'action' => $this->getPageTitle()->getLocalURL(),
                'id' => 'mw-watchlist-resetbutton' ] ) . "\n" .
            Xml::submitButton( $this->msg( 'enotif_reset' )->text(),
                [ 'name' => 'mw-watchlist-reset-submit' ] ) . "\n" .
            Html::hidden( 'token', $user->getEditToken() ) . "\n" .
            Html::hidden( 'reset', 'all' ) . "\n";
            foreach ( $nondefaults as $key => $value ) {
                $form .= Html::hidden( $key, $value ) . "\n";
            }
            $form .= Xml::closeElement( 'form' ) . "\n";
        }
 
        $this->getOutput()->addHTML( $form );
    }
 
    protected function showHideCheck( $options, $message, $name, $value, $inStructuredUi ) {
        $options[$name] = 1 - (int)$value;
 
        $attribs = [ 'class' => 'mw-input-with-label clshowhideoption cloption' ];
        if ( $inStructuredUi ) {
            $attribs[ 'data-feature-in-structured-ui' ] = true;
        }
 
        return Html::rawElement(
            'span',
            $attribs,
            // not using Html::checkLabel because that would escape the contents
            Html::check( $name, (int)$value, [ 'id' => $name ] ) . Html::rawElement(
                'label',
                $attribs + [ 'for' => $name ],
                // <nowiki/> at beginning to avoid messages with "$1 ..." being parsed as pre tags
                $this->msg( $message, '<nowiki/>' )->parse()
            )
        );
    }
 
    protected function countItems() {
        $store = MediaWikiServices::getInstance()->getWatchedItemStore();
        $count = $store->countWatchedItems( $this->getUser() );
        return floor( $count / 2 );
    }
}