<?php

/**

 * Multisite upgrade administration panel.

 *

 * @package WordPress

 * @subpackage Multisite

 * @since 3.0.0

 */

/** Load WordPress Administration Bootstrap */

require_once( dirname( __FILE__ ) . '/admin.php' );

if ( ! is_multisite() )

	wp_die( __( 'Multisite support is not enabled.' ) );

require_once( ABSPATH . WPINC . '/http.php' );

$title = __( 'Upgrade Network' );

$parent_file = 'upgrade.php';

get_current_screen()->add_help_tab( array(

	'id'      => 'overview',

	'title'   => __('Overview'),

	'content' =>

		'<p>' . __('Only use this screen once you have updated to a new version of WordPress through Updates/Available Updates (via the Network Administration navigation menu or the Toolbar). Clicking the Upgrade Network button will step through each site in the network, five at a time, and make sure any database updates are applied.') . '</p>' .

		'<p>' . __('If a version update to core has not happened, clicking this button won&#8217;t affect anything.') . '</p>' .

		'<p>' . __('If this process fails for any reason, users logging in to their sites will force the same update.') . '</p>'

) );

get_current_screen()->set_help_sidebar(

	'<p><strong>' . __('For more information:') . '</strong></p>' .

	'<p>' . __('<a href="http://codex.wordpress.org/Network_Admin_Updates_Screen" target="_blank">Documentation on Upgrade Network</a>') . '</p>' .

	'<p>' . __('<a href="http://wordpress.org/support/" target="_blank">Support Forums</a>') . '</p>'

);

require_once( ABSPATH . 'wp-admin/admin-header.php' );

if ( ! current_user_can( 'manage_network' ) )

	wp_die( __( 'You do not have permission to access this page.' ) );

echo '<div class="wrap">';

screen_icon('tools');

echo '<h2>' . __( 'Upgrade Network' ) . '</h2>';

$action = isset($_GET['action']) ? $_GET['action'] : 'show';

switch ( $action ) {

	case "upgrade":

		$n = ( isset($_GET['n']) ) ? intval($_GET['n']) : 0;

		if ( $n < 5 ) {

			global $wp_db_version;

			update_site_option( 'wpmu_upgrade_site', $wp_db_version );

		}

		$blogs = $wpdb->get_results( "SELECT * FROM {$wpdb->blogs} WHERE site_id = '{$wpdb->siteid}' AND spam = '0' AND deleted = '0' AND archived = '0' ORDER BY registered DESC LIMIT {$n}, 5", ARRAY_A );

		if ( empty( $blogs ) ) {

			echo '<p>' . __( 'All done!' ) . '</p>';

			break;

		}

		echo "<ul>";

		foreach ( (array) $blogs as $details ) {

			switch_to_blog( $details['blog_id'] );

			$siteurl = site_url();

			$upgrade_url = admin_url( 'upgrade.php?step=upgrade_db' );

			restore_current_blog();

			echo "<li>$siteurl</li>";

			$response = wp_remote_get( $upgrade_url, array( 'timeout' => 120, 'httpversion' => '1.1' ) );

			if ( is_wp_error( $response ) )

				wp_die( sprintf( __( 'Warning! Problem updating %1$s. Your server may not be able to connect to sites running on it. Error message: <em>%2$s</em>' ), $siteurl, $response->get_error_message() ) );

			do_action( 'after_mu_upgrade', $response );

			do_action( 'wpmu_upgrade_site', $details[ 'blog_id' ] );

		}

		echo "</ul>";

		?><p><?php _e( 'If your browser doesn&#8217;t start loading the next page automatically, click this link:' ); ?> <a class="button" href="upgrade.php?action=upgrade&amp;n=<?php echo ($n + 5) ?>"><?php _e("Next Sites"); ?></a></p>

		<script type='text/javascript'>

		<!--

		function nextpage() {

			location.href = "upgrade.php?action=upgrade&n=<?php echo ($n + 5) ?>";

		}

		setTimeout( "nextpage()", 250 );

		//-->

		</script><?php

	break;

	case 'show':

	default:

		if ( get_site_option( 'wpmu_upgrade_site' ) != $GLOBALS['wp_db_version'] ) :

		?>

		<h3><?php _e( 'Database Upgrade Required' ); ?></h3>

		<p><?php _e( 'WordPress has been updated! Before we send you on your way, we need to individually upgrade the sites in your network.' ); ?></p>

		<?php endif; ?>

		<p><?php _e( 'The database upgrade process may take a little while, so please be patient.' ); ?></p>

		<p><a class="button" href="upgrade.php?action=upgrade"><?php _e( 'Upgrade Network' ); ?></a></p>

		<?php

		do_action( 'wpmu_upgrade_page' );

	break;

}

?>

</div>

<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>