namespace WmsMobileServe.Utils;

/// <summary>
/// 唯一识别号工具
/// </summary>
public class UUIDUtils
{

    const string sysId = "009"; // 系统的编号

    #region 返回一个 UUID，以时间戳形式

    private static readonly object getNewUUIDLock2 = new();
    private static string lastUUID2 = string.Empty;
    private static string lasTimeTick2 = DateTime.Now.ToString("yyyyMMddHHmmssfff");
    private static ushort sortUUID2 = 0;
    /// <summary>
    /// 返回一个唯一识别号 以时间戳为基础
    /// </summary>
    /// <returns></returns>
    /// <remarks>
    /// 这方法产生的ID会短一点，但是单位时间内产生的数量较少
    /// </remarks>
    public static string GetNewUUID2()
    {
        lock (getNewUUIDLock2)
        {
            while (true)
            {
                string timeTick = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds().ToString();
                if (timeTick != lasTimeTick2)
                {
                    lasTimeTick2 = timeTick;
                    sortUUID2 = 0;
                }
                string sort = sortUUID2.ToString().PadLeft(3, '0');
                string newUUID = $"{timeTick}{sysId}{sort}";
                sortUUID2++;
                if (sortUUID2 > 900)
                    sortUUID2 = 0;
                if (newUUID != lastUUID2)
                {
                    lastUUID2 = newUUID;
                    return newUUID;
                }
            }
        }
    }

    #endregion

}