// includes/logging.php
class Campaign_Logger {
    private static $log = [];
    private static $campaign_id;
    
    public static function init($campaign_id) {
        self::$campaign_id = $campaign_id;
        self::$log = [];
    }
    
    public static function add($message, $type = 'info') {
        $log_entry = [
            'timestamp' => current_time('mysql'),
            'type' => $type,
            'message' => $message
        ];
        
        self::$log[] = $log_entry;
        update_post_meta(
            self::$campaign_id,
            '_campaign_logs',
            array_slice(array_merge(self::$log, (array)get_post_meta(self::$campaign_id, '_campaign_logs', true)), 0, 50)
        );
    }
    
    public static function get_logs() {
        return get_post_meta(self::$campaign_id, '_campaign_logs', true);
    }
    
    public static function clear_logs() {
        delete_post_meta(self::$campaign_id, '_campaign_logs');
    }
}