<?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
 *
 * @ingroup Maintenance
 */

require_once( dirname( __FILE__ ) . '/../../../maintenance/Maintenance.php' );

class MathGenerateTests extends Maintenance
{
	const REFERENCE_PAGE = 'mediawikiwiki:Extension:Math/CoverageTest';

	public function __construct()
	{
		parent::__construct();
		$this->mDescription = 'Rebuilds the MathCoverage tests';
		$this->addArg( 'page', "The page used for the testset generation.", false );
		$this->addOption( 'offset', "If set the first n equations on the page are skipped", false, true, "o" );
		$this->addOption( 'length', "If set the only n equations were processed", false, true, "l" );
		$this->addOption( 'user', "User with rights to view the page", false, true, "u" );

	}

	private static function getMathTagsFromPage( $titleString )
	{
		global $wgEnableScaryTranscluding;
		$title = Title::newFromText( $titleString );
		if ( $title->exists() ) {
			$article = new Article( $title );
			$wikiText = $article->getPage()->getContent()->getNativeData();
		} else {
			if ( $title == self::REFERENCE_PAGE ) {
				$wgEnableScaryTranscluding = true;
				$parser = new Parser();
				$wikiText = $parser->interwikiTransclude( $title, 'raw' );
			} else {
				return 'Page does not exist';
			}
		}
		// TODO: find a better way to extract math elements from a page

		$wikiText = Sanitizer::removeHTMLcomments( $wikiText );
		$wikiText = preg_replace( '#<nowiki>(.*)</nowiki>#', '', $wikiText );
		preg_match_all( "#<math>(.*?)</math>#s", $wikiText, $math );
		// TODO: Find a way to specify a key e.g '\nRenderTest:(.?)#<math>(.*?)</math>#s\n'
		// leads to array('\1'->'\2') with \1 eg Bug 2345 and \2 the math content
		return $math[1];

	}

	public function execute()
	{
		global $wgUser;
		$parserTests = array();
		$page = $this->getArg( 0, self::REFERENCE_PAGE );
		$offset = $this->getOption( 'offset', 0 );
		$length = $this->getOption( 'length', PHP_INT_MAX );
		$userName = $this->getOption( 'user', 'Maintenance script' );
		$wgUser = User::newFromName( $userName );
		$allEquations = self::getMathTagsFromPage( $page );
		if ( !is_array( $allEquations ) ) {
			echo "Could not get equations from page '$page'\n";
			echo $allEquations . PHP_EOL;
			return;
		} else {
			echo 'got ' . count( $allEquations ) . " math tags. Start processing.";
		}
		$i = 0;
		foreach ( array_slice( $allEquations, $offset, $length, true ) as $input ) {
			$output = MathRenderer::renderMath( $input, array(), MW_MATH_PNG );
			$output = preg_replace( '#src="(.*?)/(([a-f]|\d)*).png"#', 'src="\2.png"', $output );
			$parserTests[] = array( (string)$input, $output );
			$i++;
			echo '.';
		}
		echo "Generated $i tests\n";
		file_put_contents( dirname( __FILE__ ) . '/../tests/ParserTest.data', serialize( $parserTests ) );
	}
}

$maintClass = "MathGenerateTests";
require_once( RUN_MAINTENANCE_IF_MAIN );
