<?php

require_once __DIR__ . '/admin.php';
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="https://wordpress.org/support/article/network-admin-updates-screen/">Documentation on Upgrade Network</a>') . '</p>' . '<p>' . __('<a href="https://wordpress.org/support/">Support</a>') . '</p>');
require_once ABSPATH . 'wp-admin/admin-header.php';
if (!current_user_can('upgrade_network')) {
    wp_die(__('Sorry, you are not allowed to access this page.'), 403);
}
echo '<div class="wrap">';
echo '<h1>' . __('Upgrade Network') . '</h1>';
$action = isset($_GET['action']) ? $_GET['action'] : 'show';
switch ($action) {
    case 'upgrade':
        $n = isset($_GET['n']) ? (int) $_GET['n'] : 0;
        if ($n < 5) {
            global $wp_db_version;
            update_site_option('wpmu_upgrade_site', $wp_db_version);
        }
        $site_ids = get_sites(array('spam' => 0, 'deleted' => 0, 'archived' => 0, 'network_id' => get_current_network_id(), 'number' => 5, 'offset' => $n, 'fields' => 'ids', 'order' => 'DESC', 'orderby' => 'id', 'update_site_meta_cache' => false));
        if (empty($site_ids)) {
            echo '<p>' . __('All done!') . '</p>';
            break;
        }
        echo '<ul>';
        foreach ((array) $site_ids as $site_id) {
            switch_to_blog($site_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', 'sslverify' => false));
            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: %2$s'), $siteurl, '<em>' . $response->get_error_message() . '</em>'));
            }
            do_action('after_mu_upgrade', $response);
            do_action('wpmu_upgrade_site', $site_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 ((int) get_site_option('wpmu_upgrade_site') !== $GLOBALS['wp_db_version']) {
            ?>
		<h2><?php 
            _e('Database Update Required');
            ?></h2>
		<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 
        }
        ?>

		<p><?php 
        _e('The database update process may take a little while, so please be patient.');
        ?></p>
		<p><a class="button button-primary" href="upgrade.php?action=upgrade"><?php 
        _e('Upgrade Network');
        ?></a></p>
		<?php 
        do_action('wpmu_upgrade_page');
        break;
}
?>
</div>

<?php 
require_once ABSPATH . 'wp-admin/admin-footer.php';