<?php
/*
 *      Copyright 2012-2017 Daniel Kraus <bovender@bovender.de> @bovender
 *
 *      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.
 */
namespace LinkTitles;

// Attempt to include the maintenance base class from:
//   $wgScriptPath/maintenance/Maintenance.php
// Our script is normally located at:
//   $wgScriptPath/extensions/LinkTitles/LinkTitles_Maintenance.php
$maintenanceScript = __DIR__ . "/../../maintenance/Maintenance.php";
if ( file_exists( $maintenanceScript ) ) {
	require_once $maintenanceScript;
}
else
{
	// Did not find the script where we expected it (maybe because we are a
	// symlinked file -- __DIR resolves symbolic links).
	$maintenanceScript = __DIR__ . "/Maintenance.php";
	if ( file_exists( $maintenanceScript ) ) {
		require_once $maintenanceScript;
	}
	else
	{
		die("FATAL: Could not locate Maintenance.php.\n" .
			"You may want to create a symbolic link named Maintenance.php in this directory\n" .
			"which points to <YOUR_MEDIAWIKI_ROOT_IN_FILESYSTEM>/extensions/Maintenance.php\n" .
			"Ex.: ln -s /var/www/wiki/maintenance/Maintenance.php\n\n");
	}
};

require_once( __DIR__ . "/includes/Extension.php" );

/// Core class of the maintanance script.
/// @note Note that the execution of maintenance scripts is prohibited for
/// an Apache web server due to a `.htaccess` file that declares `deny from
/// all`. Other webservers may exhibit different behavior. Be aware that
/// anybody who is able to execute this script may place a high load on the
/// server.
/// @ingroup batch
class Cli extends \Maintenance {
	/// The constructor adds a description and one option.
	public function __construct() {
		parent::__construct();
		$this->addDescription("Iterates over wiki pages and automatically adds links to other pages.");
		$this->addOption(
			"start",
			"Set start index.",
			false, // not required
			true,  // requires argument
			"s"
		);
				$this->addOption(
			"page",
			"page name to process",
			false, // not required
			true,  // requires argument
			"p"
		);
				$this->addOption(
			"log",
			"enables logging to console",
			false, // not required
			false,  // requires no argument
			"l"
		);
				$this->addOption(
			"debug",
			"enables debug logging to console",
			false, // not required
			false  // requires no argument
		);
	}

	/// Main function of the maintenance script.
	/// Will iterate over all pages in the wiki (starting at a certain index,
	/// if the `--start` option is given) and call LinkTitles::processPage() for
	/// each page.
	public function execute() {
		if ($this->hasOption('log'))
		{
				Extension::$ltConsoleOutput = true;
		}
		if ($this->hasOption('debug'))
		{
				Extension::$ltConsoleOutputDebug = true;
		}
		if ( $this->hasOption('page') ) {
			if ( !$this->hasOption( 'start' ) ) {
				$this->singlePage();
			}
			else {
				$this->error( 'FATAL: Must not use --start option with --page option.', 2 );
			}
		}
		else {
			$startIndex = intval( $this->getOption( 'start', 0 ) );
			if ( $startIndex < 0 ) {
				$this->error( 'FATAL: Start index must be 0 or greater.', 1 );
			};
			$this->allPages( $startIndex);
		}
	}

	private function singlePage() {
		$pageName = strval( $this->getOption( 'page' ) );
		$this->output( "Processing single page: '$pageName'\n" );
		$title = \Title::newFromText( $pageName );
		$success = Extension::processPage( $title, \RequestContext::getMain() );
		if ( $success ) {
			$this->output( "Finished.\n" );
		}
		else {
			$this->error( 'FATAL: There is no such page.', 3 );
		}
		return $success;
	}

	private function allPages( $index = 0 ) {
		global $wgLinkTitlesNamespaces;

		// Retrieve page names from the database.
		$dbr = $this->getDB( DB_SLAVE );
		$namespacesClause = str_replace( '_', ' ','(' . implode( ', ', $wgLinkTitlesNamespaces ) . ')' );
		$res = $dbr->select(
			'page',
			array( 'page_title', 'page_namespace' ),
			array(
				'page_namespace IN ' . $namespacesClause,
			),
			__METHOD__,
			array(
				'LIMIT' => 999999999,
				'OFFSET' => $index
			)
		);
		$numPages = $res->numRows();
		$context = \RequestContext::getMain();
		$this->output( "Processing ${numPages} pages, starting at index ${index}...\n" );

		foreach ( $res as $row ) {
			$index += 1; // at this point, $index is only needed for reporting to user
			$title = \Title::makeTitleSafe( $row->page_namespace, $row->page_title );
			$this->output( sprintf( "\rPage #%d (%02.0f%%) ", $index, $index / $numPages * 100 ) );
			Extension::processPage( $title, $context );
		}

		$this->output( "\rFinished.                          \n" );
	}
}

$maintClass = 'LinkTitles\Cli';
if( defined('RUN_MAINTENANCE_IF_MAIN') ) {
	require_once( RUN_MAINTENANCE_IF_MAIN );
} else {
	require_once( DO_MAINTENANCE );
}

// vim: ts=2:sw=2:noet:comments^=\:///