<?php
/**
 * Makes the required database updates for Special:ProtectedPages
 * to show all protected pages, even ones before the page restrictions
 * schema change. All remaining page_restriction column values are moved
 * to the new table.
 *
 * @file
 * @ingroup Maintenance
 */

define( 'BATCH_SIZE', 100 );

require_once 'commandLine.inc';
	
$db =& wfGetDB( DB_MASTER );
if ( !$db->tableExists( 'page_restrictions' ) ) {
	echo "page_restrictions does not exist\n";
	exit( 1 );
}

migrate_page_restrictions( $db );

function migrate_page_restrictions( $db ) {
	$start = $db->selectField( 'page', 'MIN(page_id)', false, __FUNCTION__ );
	if( !$start ) {
		die("Nothing to do.\n");
	}
	$end = $db->selectField( 'page', 'MAX(page_id)', false, __FUNCTION__ );
	
	# Do remaining chunk
	$end += BATCH_SIZE - 1;
	$blockStart = $start;
	$blockEnd = $start + BATCH_SIZE - 1;
	$encodedExpiry = 'infinity';
	while( $blockEnd <= $end ) {
		echo "...doing page_id from $blockStart to $blockEnd\n";
		$cond = "page_id BETWEEN $blockStart AND $blockEnd AND page_restrictions !=''";
		$res = $db->select( 'page', array('page_id','page_namespace','page_restrictions'), $cond, __FUNCTION__ );
		$batch = array();
		while( $row = $db->fetchObject( $res ) ) {
			$oldRestrictions = array();
			foreach( explode( ':', trim( $row->page_restrictions ) ) as $restrict ) {
				$temp = explode( '=', trim( $restrict ) );
				// Make sure we are not settings restrictions to ""
				if( count($temp) == 1 && $temp[0] ) {
					// old old format should be treated as edit/move restriction
					$oldRestrictions["edit"] = trim( $temp[0] );
					$oldRestrictions["move"] = trim( $temp[0] );
				} else if( $temp[1] ) {
					$oldRestrictions[$temp[0]] = trim( $temp[1] );
				}
			}
			# Clear invalid columns
			if( $row->page_namespace == NS_MEDIAWIKI ) {
				$db->update( 'page', array( 'page_restrictions' => '' ),
					array( 'page_id' => $row->page_id ), __FUNCTION__ );
				echo "...removed dead page_restrictions column for page {$row->page_id}\n";
			}
			# Update restrictions table
			foreach( $oldRestrictions as $action => $restrictions ) {
				$batch[] = array( 
					'pr_page' => $row->page_id,
					'pr_type' => $action,
					'pr_level' => $restrictions,
					'pr_cascade' => 0,
					'pr_expiry' => $encodedExpiry
				);
			}
		}
		# We use insert() and not replace() as Article.php replaces
		# page_restrictions with '' when protected in the restrictions table
		if ( count( $batch ) ) {
			$ok = $db->deadlockLoop( array( $db, 'insert' ), 'page_restrictions', 
				$batch, __FUNCTION__, array( 'IGNORE' ) );
			if( !$ok ) {
				throw new MWException( "Deadlock loop failed wtf :(" );
			}
		}
		$blockStart += BATCH_SIZE - 1;
		$blockEnd += BATCH_SIZE - 1;
		wfWaitForSlaves( 5 );
	}
	echo "...removing dead rows from page_restrictions\n";
	// Kill any broken rows from previous imports
	$db->delete( 'page_restrictions', array( 'pr_level' => '' ) );
	// Kill other invalid rows
	$db->deleteJoin( 'page_restrictions', 'page', 'pr_page', 'page_id', array('page_namespace' => NS_MEDIAWIKI) );
	echo "...Done!\n";
}