<?php

/**
 * Convert a PHP messages file to a set of JSON messages files.
 *
 * Usage:
 *    php generateJsonI18n.php ExtensionName.i18n.php i18n/
 *
 * 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 Maintenance
 */

require_once __DIR__ . '/Maintenance.php';

/**
 * Maintenance script to generate JSON i18n files from a PHP i18n file.
 *
 * @ingroup Maintenance
 */
class GenerateJsonI18n extends Maintenance {
	public function __construct() {
		parent::__construct();
		$this->mDescription = "Build JSON messages files from a PHP messages file";
		$this->addArg( 'phpfile', 'PHP file defining a $messages array', true );
		$this->addArg( 'jsondir', 'Directory to write JSON files to', true );
		$this->addOption( 'langcode', 'Language code; only needed for converting core i18n files',
			false, true );
	}

	public function execute() {
		$phpfile = $this->getArg( 0 );
		$jsondir = $this->getArg( 1 );

		if ( !is_readable( $phpfile ) ) {
			$this->error( "Error reading $phpfile\n", 1 );
		}
		include $phpfile;
		$phpfileContents = file_get_contents( $phpfile );

		if ( !isset( $messages ) ) {
			$this->error( "PHP file $phpfile does not define \$messages array\n", 1 );
		}

		$extensionStyle = true;
		if ( !isset( $messages['en'] ) || !is_array( $messages['en'] ) ) {
			if ( !$this->hasOption( 'langcode' ) ) {
				$this->error( "PHP file $phpfile does not set language codes, --langcode " .
					"is required.\n", 1 );
			}
			$extensionStyle = false;
			$langcode = $this->getOption( 'langcode' );
			$messages = array( $langcode => $messages );
		} else if ( $this->hasOption( 'langcode' ) ) {
			$this->output( "Warning: --langcode option set but will not be used.\n" );
		}

		foreach ( $messages as $langcode => $langmsgs ) {
			$authors = $this->getAuthorsFromComment( $this->findCommentBefore(
				$extensionStyle ? "\$messages['$langcode'] =" : '$messages =',
				$phpfileContents
			) );
			// Make sure the @metadata key is the first key in the output
			$langmsgs = array_merge(
				array( '@metadata' => array( 'authors' => $authors ) ),
				$langmsgs
			);

			$jsonfile = "$jsondir/$langcode.json";
			$success = file_put_contents(
				$jsonfile,
				FormatJson::encode( $langmsgs, true, FormatJson::ALL_OK )
			);
			if ( $success === false ) {
				$this->error( "FAILED to write $jsonfile", 1 );
			}
			$this->output( "$jsonfile\n" );
		}

		if ( !$this->hasOption( 'langcode' ) ) {
			$shim = $this->doShim( $jsondir );
			file_put_contents( $phpfile, $shim );
		}

		$this->output( "All done.\n" );
		$this->output( "Also add \$wgMessagesDirs['YourExtension'] = __DIR__ . /i18n';\n" );
	}

	protected function doShim( $jsondir ) {
		$shim = <<<'PHP'
<?php
$messages = array();
$GLOBALS['wgHooks']['LocalisationCacheRecache'][] = function ( $cache, $code, &$cachedData ) {
	$codeSequence = array_merge( array( $code ), $cachedData['fallbackSequence'] );
	foreach ( $codeSequence as $csCode ) {
		$fileName = __DIR__ . "/{{OUT}}/$csCode.json";
		if ( is_readable( $fileName ) ) {
			$data = FormatJson::decode( file_get_contents( $fileName ), true );
			foreach ( $data as $key => $unused ) {
				if ( $key === '' || $key[0] === '@' ) {
					unset( $data[$key] );
				}
			}
			$cachedData['messages'] = array_merge( $data, $cachedData['messages'] );
		}

		$cachedData['deps'][] = new FileDependency( $fileName );
	}
	return true;
};

PHP;

		$jsondir = str_replace('\\', '/', $jsondir );
		$shim = str_replace( '{{OUT}}', $jsondir, $shim );
		return $shim;
	}

	/**
	 * Find the documentation comment immediately before a given search string
	 * @param string $needle String to search for
	 * @param string $haystack String to search in
	 * @return string Substring of $haystack starting at '/**' ending right before $needle, or empty
	 */
	protected function findCommentBefore( $needle, $haystack ) {
		$needlePos = strpos( $haystack, $needle );
		if ( $needlePos === false ) {
			return '';
		}
		// Need to pass a negative offset to strrpos() so it'll search backwards from the
		// offset
		$startPos = strrpos( $haystack, '/**', $needlePos - strlen( $haystack ) );
		if ( $startPos === false ) {
			return '';
		}

		return substr( $haystack, $startPos, $needlePos - $startPos );
	}

	/**
	 * Get an array of author names from a documentation comment containing @author declarations.
	 * @param string $comment Documentation comment
	 * @return Array of author names (strings)
	 */
	protected function getAuthorsFromComment( $comment ) {
		$matches = null;
		preg_match_all( '/@author (.*?)$/m', $comment, $matches );
		return $matches && $matches[1] ? $matches[1] : array();
	}
}

$maintClass = "GenerateJsonI18n";
require_once RUN_MAINTENANCE_IF_MAIN;