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<?php
/**
 * 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
 *
 */
use Wikimedia\Purtle\RdfWriter;
/**
 * Helper class to produce RDF representation of categories.
 */
class CategoriesRdf {
    /**
     * Prefix used for Mediawiki ontology in the dump.
     */
    private const ONTOLOGY_PREFIX = 'mediawiki';
    /**
     * Base URL for Mediawiki ontology.
     */
    private const ONTOLOGY_URL = 'https://www.mediawiki.org/ontology#';
    /**
     * OWL description of the ontology.
     */
    public const OWL_URL = 'https://www.mediawiki.org/ontology/ontology.owl';
    /**
     * Current version of the dump format.
     */
    public const FORMAT_VERSION = "1.1";
    /**
     * Special page for Dump identification.
     * Used as head URI for each wiki's category dump, e.g.:
     * https://en.wikipedia.org/wiki/Special:CategoryDump
     */
    private const SPECIAL_DUMP = 'Special:CategoryDump';
    /**
     * @var RdfWriter
     */
    private $rdfWriter;
    public function __construct( RdfWriter $writer ) {
        $this->rdfWriter = $writer;
    }
    /**
     * Setup prefixes relevant for the dump
     */
    public function setupPrefixes() {
        $this->rdfWriter->prefix( self::ONTOLOGY_PREFIX, self::ONTOLOGY_URL );
        $this->rdfWriter->prefix( 'rdfs', 'http://www.w3.org/2000/01/rdf-schema#' );
        $this->rdfWriter->prefix( 'owl', 'http://www.w3.org/2002/07/owl#' );
        $this->rdfWriter->prefix( 'schema', 'http://schema.org/' );
        $this->rdfWriter->prefix( 'cc', 'http://creativecommons.org/ns#' );
    }
    /**
     * Write RDF data for link between categories.
     * @param string $fromName Child category name
     * @param string $toName Parent category name
     */
    public function writeCategoryLinkData( $fromName, $toName ) {
        $titleFrom = Title::makeTitle( NS_CATEGORY, $fromName );
        $titleTo = Title::makeTitle( NS_CATEGORY, $toName );
        $this->rdfWriter->about( $this->titleToUrl( $titleFrom ) )
            ->say( self::ONTOLOGY_PREFIX, 'isInCategory' )
            ->is( $this->titleToUrl( $titleTo ) );
    }
    /**
     * Write out the data for single category.
     * @param string $categoryName Category name
     * @param bool $isHidden Hidden category?
     * @param int $pages Page count (note this includes only Wiki articles, not subcats or files)
     * @param int $subcategories Subcategory count
     */
    public function writeCategoryData( $categoryName, $isHidden, $pages, $subcategories ) {
        if ( $pages < 0 ) {
            // Bugfix for T201119
            $pages = 0;
        }
        $title = Title::makeTitle( NS_CATEGORY, $categoryName );
        $this->rdfWriter->about( $this->titleToUrl( $title ) )
            ->say( 'a' )
            ->is( self::ONTOLOGY_PREFIX, 'Category' );
        if ( $isHidden ) {
            $this->rdfWriter->is( self::ONTOLOGY_PREFIX, 'HiddenCategory' );
        }
        $titletext = $title->getText();
        $this->rdfWriter->say( 'rdfs', 'label' )->value( $titletext );
        $this->rdfWriter->say( self::ONTOLOGY_PREFIX, 'pages' )->value( $pages );
        $this->rdfWriter->say( self::ONTOLOGY_PREFIX, 'subcategories' )->value( $subcategories );
        // TODO: do we want files too here? Easy to add, but don't have use case so far.
    }
    /**
     * Make URL from title label
     * @param string $titleLabel Short label (without namespace) of the category
     * @return string URL for the category
     */
    public function labelToUrl( $titleLabel ) {
        return $this->titleToUrl( Title::makeTitle( NS_CATEGORY, $titleLabel ) );
    }
    /**
     * Convert Title to link to target page.
     * @param Title $title
     * @return string URL for the category
     */
    private function titleToUrl( Title $title ) {
        return $title->getFullURL( '', false, PROTO_CANONICAL );
    }
    /**
     * Get URI of the dump for this particular wiki.
     * @return false|string
     */
    public function getDumpURI() {
        return $this->titleToUrl( Title::makeTitle( NS_MAIN, self::SPECIAL_DUMP ) );
    }
}