<?php

/**
 * Observium
 *
 *   This file is part of Observium.
 *
 * @package        observium
 * @subpackage     housekeeping
 * @author         Adam Armstrong <adama@observium.org>
 * @copyright  (C) Adam Armstrong
 *
 */

// Minimum allowed age for delete alert_log entries times is 24h
$cutoff = age_to_unixtime($config['housekeeping']['alertlog']['age'], age_to_seconds('24h'));

if ($cutoff) {
    $where = "`timestamp` < FROM_UNIXTIME($cutoff)";
    $count = dbFetchCell("SELECT COUNT(*) FROM `alert_log` WHERE $where");
    if ($count) {
        if ($prompt) {
            $answer = print_prompt("$count alert log entries older than " . format_unixtime($cutoff) . " will be deleted");
        }

        if ($answer) {
            $rows = dbDelete('alert_log', "$where");
            if ($rows === FALSE) {
                // Use LIMIT with big tables
                print_debug("Alert log table is too big, using LIMIT for delete entries");
                $rows = 0;
                $i    = 1000;
                while ($i && $rows < $count) {
                    $iter = dbDelete('alert_log', $where . ' LIMIT 1000000');
                    if ($iter === FALSE) {
                        break;
                    }
                    $rows += $iter;
                    $i--;
                }
            }
            print_debug("Alert log housekeeping: deleted $rows entries");
            logfile("housekeeping.log", "Alert log: deleted $rows entries older than " . format_unixtime($cutoff));
        }
    } elseif ($prompt) {
        print_message("No alert log entries found older than " . format_unixtime($cutoff));
    }
} else {
    print_message("Alert log housekeeping disabled in configuration or incorrectly configured to less than 24h.");
}

// EOF