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[mediawiki.git] / includes / specials / SpecialMediaStatistics.php

<?php
/**
 * Implements Special:MediaStatistics
 *
 * 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
 * @ingroup SpecialPage
 * @author Brian Wolff
 */

/**
 * @ingroup SpecialPage
 */
class MediaStatisticsPage extends QueryPage {
        protected $totalCount = 0, $totalBytes = 0;

        function __construct( $name = 'MediaStatistics' ) {
                parent::__construct( $name );
                // Generally speaking there is only a small number of file types,
                // so just show all of them.
                $this->limit = 5000;
                $this->shownavigation = false;
        }

        function isExpensive() {
                return true;
        }

        /**
         * Query to do.
         *
         * This abuses the query cache table by storing mime types as "titles".
         *
         * This will store entries like [[Media:BITMAP;image/jpeg;200;20000]]
         * where the form is Media type;mime type;count;bytes.
         *
         * This relies on the behaviour that when value is tied, the order things
         * come out of querycache table is the order they went in. Which is hacky.
         * However, other special pages like Special:Deadendpages and
         * Special:BrokenRedirects also rely on this.
         */
        public function getQueryInfo() {
                $dbr = wfGetDB( DB_SLAVE );
                $fakeTitle = $dbr->buildConcat( array(
                        'img_media_type',
                        $dbr->addQuotes( ';' ),
                        'img_major_mime',
                        $dbr->addQuotes( '/' ),
                        'img_minor_mime',
                        $dbr->addQuotes( ';' ),
                        'COUNT(*)',
                        $dbr->addQuotes( ';' ),
                        'SUM( img_size )'
                ) );
                return array(
                        'tables' => array( 'image' ),
                        'fields' => array(
                                'title' => $fakeTitle,
                                'namespace' => NS_MEDIA, /* needs to be something */
                                'value' => '1'
                        ),
                        'conds' => array(
                                // WMF has a random null row in the db
                                'img_media_type IS NOT NULL'
                        ),
                        'options' => array(
                                'GROUP BY' => array(
                                        'img_media_type',
                                        'img_major_mime',
                                        'img_minor_mime',
                                )
                        )
                );
        }

        /**
         * How to sort the results
         *
         * It's important that img_media_type come first, otherwise the
         * tables will be fragmented.
         * @return Array Fields to sort by
         */
        function getOrderFields() {
                return array( 'img_media_type', 'count(*)', 'img_major_mime', 'img_minor_mime' );
        }

        /**
         * Output the results of the query.
         *
         * @param $out OutputPage
         * @param $skin Skin (deprecated presumably)
         * @param $dbr IDatabase
         * @param $res ResultWrapper Results from query
         * @param $num integer Number of results
         * @param $offset integer Paging offset (Should always be 0 in our case)
         */
        protected function outputResults( $out, $skin, $dbr, $res, $num, $offset ) {
                $prevMediaType = null;
                foreach ( $res as $row ) {
                        list( $mediaType, $mime, $totalCount, $totalBytes ) = $this->splitFakeTitle( $row->title );
                        if ( $prevMediaType !== $mediaType ) {
                                if ( $prevMediaType !== null ) {
                                        // We're not at beginning, so we have to
                                        // close the previous table.
                                        $this->outputTableEnd();
                                }
                                $this->outputMediaType( $mediaType );
                                $this->outputTableStart( $mediaType );
                                $prevMediaType = $mediaType;
                        }
                        $this->outputTableRow( $mime, intval( $totalCount ), intval( $totalBytes ) );
                }
                if ( $prevMediaType !== null ) {
                        $this->outputTableEnd();
                }
        }

        /**
         * Output closing </table>
         */
        protected function outputTableEnd() {
                $this->getOutput()->addHtml( Html::closeElement( 'table' ) );
        }

        /**
         * Output a row of the stats table
         *
         * @param $mime String mime type (e.g. image/jpeg)
         * @param $count integer Number of images of this type
         * @param $totalBytes integer Total space for images of this type
         */
        protected function outputTableRow( $mime, $count, $bytes ) {
                $mimeSearch = SpecialPage::getTitleFor( 'MIMEsearch', $mime );
                $row = Html::rawElement(
                        'td',
                        array(),
                        Linker::link( $mimeSearch, htmlspecialchars( $mime ) )
                );
                $row .= Html::element(
                        'td',
                        array(),
                        $this->getExtensionList( $mime )
                );
                $row .= Html::rawElement(
                        'td',
                        // Make sure js sorts it in numeric order
                        array( 'data-sort-value' => $count ),
                        $this->msg( 'mediastatistics-nfiles' )
                                ->numParams( $count )
                                /** @todo Check to be sure this really should have number formatting */
                                ->numParams( $this->makePercentPretty( $count / $this->totalCount ) )
                                ->parse()
                );
                $row .= Html::rawElement(
                        'td',
                        // Make sure js sorts it in numeric order
                        array( 'data-sort-value' =>  $bytes ),
                        $this->msg( 'mediastatistics-nbytes' )
                                ->numParams( $bytes )
                                ->sizeParams( $bytes )
                                /** @todo Check to be sure this really should have number formatting */
                                ->numParams( $this->makePercentPretty( $bytes / $this->totalBytes ) )
                                ->parse()
                );

                $this->getOutput()->addHTML( Html::rawElement( 'tr', array(), $row ) );
        }

        /**
         * @param float $decimal A decimal percentage (ie for 12.3%, this would be 0.123)
         * @return String The percentage formatted so that 3 significant digits are shown.
         */
        protected function makePercentPretty( $decimal ) {
                $decimal *= 100;
                // Always show three useful digits
                if ( $decimal == 0 ) {
                        return '0';
                }
                if ( $decimal >= 100 ) {
                        return '100';
                }
                $percent = sprintf( "%." . max( 0, 2 - floor( log10( $decimal ) ) ) . "f", $decimal );
                // Then remove any trailing 0's
                return preg_replace( '/\.?0*$/', '', $percent );
        }

        /**
         * Given a mime type, return a comma separated list of allowed extensions.
         *
         * @param $mime String mime type
         * @return String Comma separated list of allowed extensions (e.g. ".ogg, .oga")
         */
        private function getExtensionList( $mime ) {
                $exts = MimeMagic::singleton()->getExtensionsForType( $mime );
                if ( $exts === null ) {
                        return '';
                }
                $extArray = explode( ' ', $exts );
                $extArray = array_unique( $extArray );
                foreach ( $extArray as &$ext ) {
                        $ext = '.' . $ext;
                }

                return $this->getLanguage()->commaList( $extArray );
        }

        /**
         * Output the start of the table
         *
         * Including opening <table>, and first <tr> with column headers.
         */
        protected function outputTableStart( $mediaType ) {
                $this->getOutput()->addHTML(
                        Html::openElement(
                                'table',
                                array( 'class' => array(
                                        'mw-mediastats-table',
                                        'mw-mediastats-table-' . strtolower( $mediaType ),
                                        'sortable',
                                        'wikitable'
                                ))
                        )
                );
                $this->getOutput()->addHTML( $this->getTableHeaderRow() );
        }

        /**
         * Get (not output) the header row for the table
         *
         * @return String the header row of the able
         */
        protected function getTableHeaderRow() {
                $headers = array( 'mimetype', 'extensions', 'count', 'totalbytes' );
                $ths = '';
                foreach ( $headers as $header ) {
                        $ths .= Html::rawElement(
                                'th',
                                array(),
                                // for grep:
                                // mediastatistics-table-mimetype, mediastatistics-table-extensions
                                // tatistics-table-count, mediastatistics-table-totalbytes
                                $this->msg( 'mediastatistics-table-' . $header )->parse()
                        );
                }
                return Html::rawElement( 'tr', array(), $ths );
        }

        /**
         * Output a header for a new media type section
         *
         * @param $mediaType string A media type (e.g. from the MEDIATYPE_xxx constants)
         */
        protected function outputMediaType( $mediaType ) {
                $this->getOutput()->addHTML(
                        Html::element(
                                'h2',
                                array( 'class' => array(
                                        'mw-mediastats-mediatype',
                                        'mw-mediastats-mediatype-' . strtolower( $mediaType )
                                )),
                                // for grep
                                // mediastatistics-header-unknown, mediastatistics-header-bitmap,
                                // mediastatistics-header-drawing, mediastatistics-header-audio,
                                // mediastatistics-header-video, mediastatistics-header-multimedia,
                                // mediastatistics-header-office, mediastatistics-header-text,
                                // mediastatistics-header-executable, mediastatistics-header-archive,
                                $this->msg( 'mediastatistics-header-' . strtolower( $mediaType ) )->text()
                        )
                );
                /** @todo Possibly could add a message here explaining what the different types are.
                 *    not sure if it is needed though.
                 */
        }

        /**
         * parse the fake title format that this special page abuses querycache with.
         *
         * @param $fakeTitle String A string formatted as <media type>;<mime type>;<count>;<bytes>
         * @return Array The constituant parts of $fakeTitle
         */
        private function splitFakeTitle( $fakeTitle ) {
                return explode( ';', $fakeTitle, 4 );
        }

        /**
         * What group to put the page in
         * @return string
         */
        protected function getGroupName() {
                return 'media';
        }

        /**
         * This method isn't used, since we override outputResults, but
         * we need to implement since abstract in parent class.
         *
         * @param $skin Skin
         * @param $result stdObject Result row
         * @return bool|string|void
         * @throws MWException
         */
        public function formatResult( $skin, $result ) {
                throw new MWException( "unimplemented" );
        }

        /**
         * Initialize total values so we can figure out percentages later.
         *
         * @param $dbr IDatabase
         * @param $res ResultWrapper
         */
        public function preprocessResults( $dbr, $res ) {
                $this->totalCount = $this->totalBytes = 0;
                foreach ( $res as $row ) {
                        $mediaStats = $this->splitFakeTitle( $row->title );
                        $this->totalCount += isset( $mediaStats[2] ) ? $mediaStats[2] : 0;
                        $this->totalBytes += isset( $mediaStats[3] ) ? $mediaStats[3] : 0;
                }
                $res->seek( 0 );
        }
}