using System.IO;

namespace 口罩泄露定制款
{
    public class IDGenerator
    {
        private static int currentID;
        private static readonly object lockObject = new object();
        private const string prefix = "ID-";
        private const string filePath = "currentID.txt";

        static IDGenerator()
        {
            if (File.Exists(filePath))
            {
                var idString = File.ReadAllText(filePath);
                int.TryParse(idString, out currentID);
            }
        }

        public static string GenerateID()
        {
            lock (lockObject)
            {
                currentID++;
                File.WriteAllText(filePath, currentID.ToString());
                return $"{prefix}{currentID:D5}"; // 生成形如 "ID-00001" 的编号
            }
        }
    }
}