<?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="https://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">';
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 = $wpdb->get_results("SELECT blog_id FROM {$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()));
            /**
             * Fires after the Multisite DB upgrade for each site is complete.
             *
             * @since MU
             *
             * @param array|WP_Error $response The upgrade response array or WP_Error on failure.
             */
            do_action('after_mu_upgrade', $response);
            /**
             * Fires after each site has been upgraded.
             *
             * @since MU
             *
             * @param int $blog_id The id of the blog.
             */
            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
        /**
         * Fires before the footer on the network upgrade screen.
         *
         * @since MU
         */
        do_action('wpmu_upgrade_page');
        break;
}
?>
</div>

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