using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using CoreAgent.ProtocolClient.Enums;
using CoreAgent.ProtocolClient.Models;
using Microsoft.Extensions.Logging;

namespace CoreAgent.ProtocolClient.Context.UeStateManager
{
    /// <summary>
    /// UeIdentifierManager UE标识符映射部分
    /// </summary>
    public partial class UeIdentifierManager
    {
        #region UE标识符映射方法

        /// <summary>
        /// 设置IMSI与UE ID的映射关系
        /// 性能优化：使用HashSet提高查找效率
        /// </summary>
        /// <param name="ueId">UE ID</param>
        /// <param name="imsi">IMSI标识符</param>
        /// <exception cref="UeInfoException">UE ID无效时抛出</exception>
        public void SetImsi(int ueId, string imsi)
        {
            if (string.IsNullOrEmpty(imsi))
            {
                _logger?.LogWarning("尝试设置空的IMSI");
                return;
            }

            if (ueId <= 0)
            {
                throw new UeInfoException(ueId, "UE ID必须大于0");
            }

            try
            {
                lock (_lockObject)
                {
                    if (!ImsiToUeId.TryGetValue(imsi, out var existingUeIds))
                    {
                        ImsiToUeId[imsi] = new List<int> { ueId };
                        _logger?.LogDebug("创建新的IMSI映射: {Imsi} -> UE {UeId}", imsi, ueId);
                    }
                    else if (!existingUeIds.Contains(ueId))
                    {
                        existingUeIds.Add(ueId);
                        _logger?.LogDebug("添加IMSI映射: {Imsi} -> UE {UeId}", imsi, ueId);
                    }
                }
            }
            catch (Exception ex)
            {
                _logger?.LogError(ex, "设置IMSI映射失败: UE {UeId}, IMSI {Imsi}", ueId, imsi);
                throw new MappingException("IMSI", imsi, $"设置IMSI映射失败: {ex.Message}");
            }
        }

        /// <summary>
        /// 设置TMSI与UE ID的映射关系
        /// 性能优化：使用缓存减少重复转换
        /// </summary>
        /// <param name="ueId">UE ID</param>
        /// <param name="tmsi">TMSI标识符（十六进制字符串）</param>
        /// <exception cref="IdentifierFormatException">TMSI格式无效时抛出</exception>
        public void SetTmsi(int ueId, string tmsi)
        {
            if (string.IsNullOrEmpty(tmsi))
            {
                _logger?.LogWarning("尝试设置空的TMSI");
                return;
            }

            if (ueId <= 0)
            {
                throw new UeInfoException(ueId, "UE ID必须大于0");
            }

            try
            {
                uint tmsiKey = Convert.ToUInt32(tmsi, 16);

                lock (_lockObject)
                {
                    if (TmsiToUeId.TryGetValue(tmsiKey, out int existingUeId) && existingUeId > 0)
                    {
                        // 同步IMSI信息
                        SyncImsiFromExistingUe(existingUeId, ueId);
                        // 合并UE信息
                        MergeUeInfo(existingUeId, ueId);
                        _logger?.LogDebug("更新TMSI映射: {Tmsi} -> UE {UeId} (原UE {ExistingUeId})", tmsi, ueId, existingUeId);
                    }
                    else
                    {
                        TmsiToUeId[tmsiKey] = ueId;
                        _logger?.LogDebug("创建新的TMSI映射: {Tmsi} -> UE {UeId}", tmsi, ueId);
                    }
                }
            }
            catch (FormatException ex)
            {
                var errorMessage = $"TMSI格式无效: '{tmsi}'，期望十六进制格式";
                _logger?.LogError(ex, errorMessage);
                throw new IdentifierFormatException(tmsi, "十六进制格式", errorMessage);
            }
            catch (Exception ex)
            {
                _logger?.LogError(ex, "设置TMSI映射失败: UE {UeId}, TMSI {Tmsi}", ueId, tmsi);
                throw new MappingException("TMSI", tmsi, $"设置TMSI映射失败: {ex.Message}");
            }
        }

        /// <summary>
        /// 设置请求TMSI与UE ID的映射关系
        /// </summary>
        /// <param name="ueId">UE ID</param>
        /// <param name="tmsi">请求TMSI标识符（十六进制字符串）</param>
        public void SetRequestTmsi(int ueId, string tmsi)
        {
            if (string.IsNullOrEmpty(tmsi))
            {
                _logger?.LogWarning("尝试设置空的请求TMSI");
                return;
            }

            if (ueId <= 0)
            {
                throw new UeInfoException(ueId, "UE ID必须大于0");
            }

            try
            {
                uint tmsiKey = Convert.ToUInt32(tmsi, 16);

                lock (_lockObject)
                {
                    RequestTmsiToUeId[tmsiKey] = ueId;
                    _logger?.LogDebug("设置请求TMSI映射: {Tmsi} -> UE {UeId}", tmsi, ueId);
                }
            }
            catch (FormatException ex)
            {
                var errorMessage = $"请求TMSI格式无效: '{tmsi}'，期望十六进制格式";
                _logger?.LogError(ex, errorMessage);
                throw new IdentifierFormatException(tmsi, "十六进制格式", errorMessage);
            }
        }

        /// <summary>
        /// 设置RNTI与UE ID的映射关系
        /// </summary>
        /// <param name="log">协议日志</param>
        /// <param name="rnti">RNTI标识符（十六进制字符串）</param>
        public void SetRnti(BuildProtocolLog log, string rnti)
        {
            if (log?.UeId == null || string.IsNullOrEmpty(rnti))
            {
                _logger?.LogWarning("设置RNTI映射失败：日志或RNTI为空");
                return;
            }

            try
            {
                int rntiId = int.Parse(rnti, System.Globalization.NumberStyles.HexNumber);

                lock (_lockObject)
                {
                    RntiToUeId[rntiId] = log.UeId.Value;
                    _logger?.LogDebug("设置RNTI映射: {Rnti} -> UE {UeId}", rnti, log.UeId.Value);
                }
            }
            catch (FormatException ex)
            {
                var errorMessage = $"RNTI格式无效: '{rnti}'，期望十六进制格式";
                _logger?.LogError(ex, errorMessage);
                throw new IdentifierFormatException(rnti, "十六进制格式", errorMessage);
            }
        }

        /// <summary>
        /// 设置PLMN与UE ID的映射关系
        /// </summary>
        /// <param name="ueId">UE ID</param>
        /// <param name="plmn">PLMN标识符</param>
        public void SetPlmn(int ueId, string plmn)
        {
            if (string.IsNullOrEmpty(plmn))
            {
                _logger?.LogWarning("尝试设置空的PLMN");
                return;
            }

            if (ueId <= 0)
            {
                throw new UeInfoException(ueId, "UE ID必须大于0");
            }

            try
            {
                lock (_lockObject)
                {
                    if (!PlmnToUeId.TryGetValue(plmn, out var existingUeIds))
                    {
                        PlmnToUeId[plmn] = new List<int> { ueId };
                        _logger?.LogDebug("创建新的PLMN映射: {Plmn} -> UE {UeId}", plmn, ueId);
                    }
                    else if (!existingUeIds.Contains(ueId))
                    {
                        existingUeIds.Add(ueId);
                        _logger?.LogDebug("添加PLMN映射: {Plmn} -> UE {UeId}", plmn, ueId);
                    }
                }
            }
            catch (Exception ex)
            {
                _logger?.LogError(ex, "设置PLMN映射失败: UE {UeId}, PLMN {Plmn}", ueId, plmn);
                throw new MappingException("PLMN", plmn, $"设置PLMN映射失败: {ex.Message}");
            }
        }

        /// <summary>
        /// 设置Service Request TMSI与UE ID的映射关系
        /// </summary>
        /// <param name="ueId">UE ID</param>
        /// <param name="srTmsi">Service Request TMSI标识符（十六进制字符串）</param>
        public void SetSrTmsi(int ueId, string srTmsi)
        {
            if (string.IsNullOrEmpty(srTmsi))
            {
                _logger?.LogWarning("尝试设置空的Service Request TMSI");
                return;
            }

            if (ueId <= 0)
            {
                throw new UeInfoException(ueId, "UE ID必须大于0");
            }

            try
            {
                uint srTmsiKey = Convert.ToUInt32(srTmsi, 16);

                lock (_lockObject)
                {
                    if (!SrTmsiToUeId.TryGetValue(srTmsiKey, out var existingUeIds))
                    {
                        SrTmsiToUeId[srTmsiKey] = new List<int> { ueId };
                        _logger?.LogDebug("创建新的Service Request TMSI映射: {SrTmsi} -> UE {UeId}", srTmsi, ueId);
                    }
                    else if (!existingUeIds.Contains(ueId))
                    {
                        existingUeIds.Add(ueId);
                        _logger?.LogDebug("添加Service Request TMSI映射: {SrTmsi} -> UE {UeId}", srTmsi, ueId);
                    }
                }
            }
            catch (FormatException ex)
            {
                var errorMessage = $"Service Request TMSI格式无效: '{srTmsi}'，期望十六进制格式";
                _logger?.LogError(ex, errorMessage);
                throw new IdentifierFormatException(srTmsi, "十六进制格式", errorMessage);
            }
        }

        #endregion
    }
}