using Newtonsoft.Json;

namespace CoreAgent.Domain.Models.Protocol;

/// <summary>
/// 用户网络身份信息
/// 用于存储移动网络用户的基本身份和位置信息
/// 遵循DDD（领域驱动设计）原则，作为领域模型的一部分
/// </summary>
public class UserNetworkIdentity
{
    /// <summary>
    /// 公共陆地移动网络标识
    /// </summary>
    [JsonProperty("plmn")]
    public string? Plmn { get; set; }

    /// <summary>
    /// 旧的临时移动用户标识
    /// </summary>
    [JsonProperty("oldTmsi")]
    public string? OldTmsi { get; set; }

    /// <summary>
    /// 临时移动用户标识
    /// </summary>
    [JsonProperty("tmsi")]
    public string? Tmsi { get; set; }

    /// <summary>
    /// 国际移动用户标识
    /// </summary>
    [JsonProperty("imsi")]
    public string? Imsi { get; set; }

    /// <summary>
    /// 小区ID
    /// </summary>
    [JsonProperty("cellId")]
    public int? CellId { get; set; }

    /// <summary>
    /// 用户设备ID
    /// </summary>
    [JsonProperty("ueId")]
    public int? UeId { get; set; }

    /// <summary>
    /// 初始化用户网络身份信息的新实例
    /// </summary>
    public UserNetworkIdentity()
    {
    }

    /// <summary>
    /// 初始化用户网络身份信息的新实例
    /// </summary>
    /// <param name="plmn">公共陆地移动网络标识</param>
    /// <param name="oldTmsi">旧的临时移动用户标识</param>
    /// <param name="tmsi">临时移动用户标识</param>
    /// <param name="imsi">国际移动用户标识</param>
    /// <param name="cellId">小区ID</param>
    /// <param name="ueId">用户设备ID</param>
    public UserNetworkIdentity(
        string? plmn = null,
        string? oldTmsi = null,
        string? tmsi = null,
        string? imsi = null,
        int? cellId = null,
        int? ueId = null)
    {
        Plmn = plmn;
        OldTmsi = oldTmsi;
        Tmsi = tmsi;
        Imsi = imsi;
        CellId = cellId;
        UeId = ueId;
    }

    /// <summary>
    /// 检查是否包含有效的用户身份信息
    /// </summary>
    /// <returns>是否包含有效信息</returns>
    public bool HasValidIdentity()
    {
        return !string.IsNullOrWhiteSpace(Imsi) || 
               !string.IsNullOrWhiteSpace(Tmsi) || 
               UeId.HasValue;
    }

    /// <summary>
    /// 检查是否包含位置信息
    /// </summary>
    /// <returns>是否包含位置信息</returns>
    public bool HasLocationInfo()
    {
        return !string.IsNullOrWhiteSpace(Plmn) || CellId.HasValue;
    }

    /// <summary>
    /// 获取用户身份摘要信息
    /// </summary>
    /// <returns>摘要信息</returns>
    public string GetIdentitySummary()
    {
        var parts = new List<string>();
        
        if (!string.IsNullOrWhiteSpace(Imsi))
            parts.Add($"IMSI:{Imsi}");
        
        if (!string.IsNullOrWhiteSpace(Tmsi))
            parts.Add($"TMSI:{Tmsi}");
        
        if (UeId.HasValue)
            parts.Add($"UE:{UeId}");
        
        if (!string.IsNullOrWhiteSpace(Plmn))
            parts.Add($"PLMN:{Plmn}");
        
        if (CellId.HasValue)
            parts.Add($"Cell:{CellId}");

        return parts.Count > 0 ? string.Join(" | ", parts) : "No Identity Info";
    }

    /// <summary>
    /// 检查TMSI是否发生变化
    /// </summary>
    /// <returns>TMSI是否发生变化</returns>
    public bool HasTmsiChanged()
    {
        return !string.IsNullOrWhiteSpace(OldTmsi) && 
               !string.IsNullOrWhiteSpace(Tmsi) && 
               !OldTmsi.Equals(Tmsi, StringComparison.OrdinalIgnoreCase);
    }

    /// <summary>
    /// 获取TMSI变化信息
    /// </summary>
    /// <returns>TMSI变化信息</returns>
    public string GetTmsiChangeInfo()
    {
        if (HasTmsiChanged())
        {
            return $"TMSI Changed: {OldTmsi} -> {Tmsi}";
        }
        return "TMSI Unchanged";
    }

    /// <summary>
    /// 创建用户网络身份信息的副本
    /// </summary>
    /// <returns>新的用户网络身份信息</returns>
    public UserNetworkIdentity Copy()
    {
        return new UserNetworkIdentity
        {
            Plmn = Plmn,
            OldTmsi = OldTmsi,
            Tmsi = Tmsi,
            Imsi = Imsi,
            CellId = CellId,
            UeId = UeId
        };
    }

    /// <summary>
    /// 更新TMSI信息
    /// </summary>
    /// <param name="newTmsi">新的TMSI</param>
    public void UpdateTmsi(string? newTmsi)
    {
        if (!string.IsNullOrWhiteSpace(Tmsi))
        {
            OldTmsi = Tmsi;
        }
        Tmsi = newTmsi;
    }

    /// <summary>
    /// 转换为JSON字符串
    /// </summary>
    /// <returns>JSON字符串</returns>
    public string ToJson()
    {
        return JsonConvert.SerializeObject(this, Formatting.Indented);
    }

    /// <summary>
    /// 从JSON字符串创建用户网络身份信息
    /// </summary>
    /// <param name="json">JSON字符串</param>
    /// <returns>用户网络身份信息</returns>
    public static UserNetworkIdentity FromJson(string json)
    {
        return JsonConvert.DeserializeObject<UserNetworkIdentity>(json) ?? new UserNetworkIdentity();
    }

    /// <summary>
    /// 合并另一个用户网络身份信息
    /// </summary>
    /// <param name="other">另一个用户网络身份信息</param>
    /// <returns>合并后的用户网络身份信息</returns>
    public UserNetworkIdentity Merge(UserNetworkIdentity other)
    {
        if (other == null)
            return this;

        return new UserNetworkIdentity
        {
            Plmn = Plmn ?? other.Plmn,
            OldTmsi = OldTmsi ?? other.OldTmsi,
            Tmsi = Tmsi ?? other.Tmsi,
            Imsi = Imsi ?? other.Imsi,
            CellId = CellId ?? other.CellId,
            UeId = UeId ?? other.UeId
        };
    }
}