<?php
/**
 * Observium
 *
 *   This file is part of Observium.
 *
 * @package        observium
 * @subpackage     webui
 * @copyright  (C) 2006-2013 Adam Armstrong, (C) 2013-2023 Observium Limited
 *
 */

// Variables:
// $notifications - display notifications tooltip in the lower right corner
// $alerts        - display urgent errors for admin users at the top of each page

// Notifications and alerts in bottom navbar
$notifications_item = get_cache_item('notifications');
$alerts_item        = get_cache_item('alerts');
//print_vars($notifications_item->isHit());
//print_vars($alerts_item->isHit());

if (!ishit_cache_item($notifications_item) || !ishit_cache_item($alerts_item)) {
    // Generate/collect notifications/alerts


    if ($_SESSION['userlevel'] > 7) {
        $latest             = [];
        $latest['version']  = get_obs_attrib('latest_ver');
        $latest['revision'] = get_obs_attrib('latest_rev');
        $latest['date']     = get_obs_attrib('latest_rev_date');

        if ($config['version_check'] && $latest['revision'] > OBSERVIUM_REV + $config['version_check_revs']) {
            $notifications[] = ['text'     => '<h4>There is a newer revision of Observium available!</h4> Version ' . $latest['version'] . ' (' . format_unixtime(datetime_to_unixtime($latest['date']), 'jS F Y') . ') is ' . ($latest['revision'] - OBSERVIUM_REV) . ' revisions ahead.', 'severity' => 'warning',
                                'unixtime' => $config['time']['now']];
            $alerts[]        = [
              'title'    => 'There is a newer revision of Observium available!',
              'text'     => 'Version ' . $latest['version'] . ' (' . format_unixtime(datetime_to_unixtime($latest['date']), 'jS F Y') . ') is ' . ($latest['revision'] - OBSERVIUM_REV) . ' revisions ahead.',
              'severity' => 'warning'
            ];
        }

//if (!function_exists('hash_exists'))
//{
//  $alerts[] = array('text' => '<b>The PHP `hash` module is missing</b> This will cause editing and other forms to fail. Please install it.', 'severity' => 'danger');
//}

        // Warn about lack of encryption unless told not to.
        if ($config['login_remember_me'] || isset($_SESSION['encrypt_required'])) {
            if (!OBS_ENCRYPT) {
                print_warning('For use the "remember me" feature, required php version not less than 7.2 (with "sodium" extension) or "mcrypt" extension. Alternatively, you can disable this feature by setting $config[\'login_remember_me\'] = FALSE; in your config.');
            }
        }

        // Warning about web_url config, only for ssl
        if (is_ssl() && preg_match('/^http:/', $config['web_url'])) {
            $notifications[] = ['text'     => 'Setting \'web_url\' for "External Web URL" not set or incorrect, please update on ' . generate_link('Global Settings Edit', ['page' => 'settings', 'section' => 'wui']) . ' page.', 'severity' => 'warning',
                                'unixtime' => $config['time']['now']];
        }

        // Warning about need DB schema update
        $db_version = get_db_version();
        $db_version = sprintf("%03d", $db_version + 1);
        if (is_file($config['install_dir'] . "/update/$db_version.sql") || is_file($config['install_dir'] . "/update/$db_version.php")) {
            $notifications[] = ['text'     => 'Your database schema is old and needs updating. Run from server console:
                                          <pre style="padding: 3px" class="small">' . $config['install_dir'] . '/discovery.php -u</pre>', 'severity' => 'alert',
                                'unixtime' => $config['time']['now']];
        }
        unset($db_version);

        // Get GLOBAL events for last 3 days
        foreach (dbFetchRows('SELECT * FROM `eventlog` WHERE `entity_type` = ? AND `timestamp` > (CURDATE() - INTERVAL 3 DAY)', ['global']) as $entry) {
            $notifications[] = ['unixtime' => strtotime($entry['timestamp']),
                                'text'     => $entry['message'],
                                'severity' => $entry['severity']];
        }
    }

    if (isset($config['alerts']['suppress']) && $config['alerts']['suppress']) {
        $notifications[] = ['text'     => '<h4>All Alert Notifications Suppressed</h4>' .
                                          'All alert notifications have been suppressed in the configuration.',
                            'severity' => 'warning',
                            'unixtime' => $config['time']['now']];
    }

    // Display warning for scheduled maintenance
    if (isset($cache['maint']['count']) && $cache['maint']['count'] > 0) {
        $notifications[] = ['text'     => '<h4>Scheduled Maintenance in Progress</h4>' .
                                          'Some or all alert notifications have been suppressed due to a scheduled maintenance.',
                            'severity' => 'warning',
                            'unixtime' => $config['time']['now']];


        $alerts[] = [
          'title'    => 'Scheduled Maintenance in Progress',
          'text'     => 'Some or all alert notifications have been suppressed due to a scheduled maintenance.',
          'severity' => 'warning'
        ];
    }

    // Store $notifications and $alerts in fast caching
    set_cache_item($notifications_item, $notifications, ['ttl' => 900]); // 15 min
    set_cache_item($alerts_item, $alerts, ['ttl' => 900]);               // 15 min

    // Clear expired cache
    del_cache_expired();

    // End build cache
} else {

    //print_vars(get_cache_data($notifications_item));
    $notifications = array_merge(get_cache_data($notifications_item), $notifications);
    $alerts        = array_merge(get_cache_data($alerts_item), $alerts);
}

// Admin level notifications on settings/perf pages
if ($_SESSION['userlevel'] >= 10 && (in_array($vars['tab'], ['data', 'perf', 'edit', 'showtech']) ||
                                     in_array($vars['page'], ['about', 'pollerlog', 'settings', 'preferences']))) {

    if (version_compare(PHP_VERSION, OBS_MIN_PHP_VERSION, '<')) {
        $notifications[] = ['text'     => '<h4>Your PHP version is too old.</h4>
                                          Your currently installed PHP version <b>' . PHP_MAJOR_VERSION . '.' . PHP_MINOR_VERSION . '.' . PHP_RELEASE_VERSION . '</b>
                                          is older than the required minimum.
                                          Please upgrade your version of PHP to prevent possible incompatibilities and security problems.<br/>
                                          Currently recommended version(s): <b>7.2.x</b> and newer.',
                            'severity' => 'danger',
                            'unixtime' => $config['time']['now']];
        $alerts[]        = [
          'title'    => 'PHP version is old',
          'text'     => 'Your currently installed PHP version <b>' . PHP_MAJOR_VERSION . '.' . PHP_MINOR_VERSION . '.' . PHP_RELEASE_VERSION .
                        "</b> is older than the recommended minimum <b>7.2.x</b>.",
          'severity' => 'alert'
        ];
    }

    // Same for MySQL/MariaDB
    $versions = get_versions();
    if ($versions['mysql_old']) {
        $mysql_recommented = $versions['mysql_name'] === 'MariaDB' ? OBS_MIN_MARIADB_VERSION : OBS_MIN_MYSQL_VERSION;

        $notifications[] = ['text'     => '<h4>Your ' . $versions['mysql_name'] . ' version is old.</h4>
                                          Your currently installed ' . $versions['mysql_name'] . ' version <b>' . $versions['mysql_version'] . '</b>
                                          is older than the recommended minimum.
                                          Please upgrade your version of ' . $versions['mysql_name'] . ' to prevent possible incompatibilities and security problems.<br/>
                                          Currently recommended version is <b>' . $mysql_recommented . '</b> and newer.',
                            'severity' => 'warning',
                            'unixtime' => $config['time']['now']];
        $alerts[]        = [
          'title'    => $versions['mysql_name'] . ' version is old',
          'text'     => 'Your currently installed ' . $versions['mysql_name'] . ' version <b>' . $versions['mysql_version'] .
                        "</b> is older than the recommended minimum <b>$mysql_recommented</b>.",
          'severity' => 'warning'
        ];
    }

    // Warning about obsolete config on some pages
    if (OBS_DEBUG) {
        // FIXME move to notification center?
        print_obsolete_config();
    }

}
// Sort by unixtime
$notifications = array_sort_by($notifications, 'unixtime', SORT_DESC, SORT_NUMERIC);

// Clean cache item
unset($notifications_item, $alerts_item);
//del_cache_expired();
//print_vars(get_cache_items('__wui'));
//print_vars(get_cache_stats());

// EOF