using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.Json;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using RainOpsMini.Helpers;
using RainOpsMini.Services;

namespace RainOpsMini.Plugins
{
    /// <summary>
    /// 战队跳边插件配置类
    /// </summary>
    public class TeamSwitchConfig
    {

        /// <summary>
        /// 启用插件
        /// </summary>
        public bool Enabled { get; set; } = false;
        /// <summary>
        /// 触发关键字 (逗号分隔，支持拼音首字母)
        /// </summary>
        public string LikeKey { get; set; } = "tb,stb,跳边";

        /// <summary>
        /// 免费额度耗尽提示内容
        /// </summary>
        public string LimitExhaustedMsg { get; set; } = "免费更换阵营额度已经耗尽，请使用STB命令更换阵营！";

        /// <summary>
        /// 每张地图允许免费更换阵营的个数
        /// </summary>
        public int LimitExhaustedCount { get; set; } = 10;

        /// <summary>
        /// 使用积分跳边所需要的积分数量
        /// </summary>
        public int STBIntegrate { get; set; } = 30;

        /// <summary>
        /// 有权限协助他人进行跳边的SteamID列表 (包含SteamID即可)
        /// </summary>
        public List<string> STBSteamID { get; set; } = new List<string>();

        /// <summary>
        /// 开局多少秒内允许使用免费额度
        /// </summary>
        public int STBSecond { get; set; } = 300;

        /// <summary>
        /// 免费跳边时间已过提示语
        /// </summary>
        public string STBSecondMsg { get; set; } = "免费跳边时间已过，请使用STB命令更换阵营";

        /// <summary>
        /// 玩家求助广播内容模板 ({Name}为玩家名，{Code}为指令)
        /// </summary>
        public string STBHelpMsg { get; set; } = "玩家【{Name}】想要更换阵营！快来帮帮Ta：{Code}";

        /// <summary>
        /// 帮助指令前缀 (后面跟4位随机码)
        /// </summary>
        public string STBHelpCMD { get; set; } = "hp";
    }

    /// <summary>
    /// 战队跳边插件
    /// </summary>
    public class TeamSwitchPlugin : IPlugin, IDisposable
    {
        /// <summary>
        /// 插件名称
        /// </summary>
        public string Name => "玩家跳边系统";

        /// <summary>
        /// 插件描述
        /// </summary>
        public string Description => "允许玩家通过聊天指令或积分更换阵营，支持免费额度和战队协助";

        /// <summary>
        /// 插件分类
        /// </summary>
        public PluginCategory Category => PluginCategory.PointsFunction;

        /// <summary>
        /// 是否启用
        /// </summary>
        public bool IsEnabled => _config.Enabled;

        private TeamSwitchConfig _config = new TeamSwitchConfig();
        
        // 状态
        private string _currentMap = "";
        private Dictionary<string, int> _freeUsage = new Dictionary<string, int>(); // SteamID -> 次数
        private Dictionary<string, string> _pendingHelp = new Dictionary<string, string>(); // 验证码 -> SteamId
        private HashSet<string> _helperSteamIds = new HashSet<string>();
        private readonly object _lock = new object();
        private readonly Random _random = new Random();

        /// <summary>
        /// 构造函数，初始化插件并订阅RCON消息事件
        /// </summary>
        public TeamSwitchPlugin()
        {
            ApplyConfig();
        }

        /// <summary>
        /// 获取当前配置
        /// </summary>
        /// <returns>配置对象</returns>
        public object GetConfig() => _config;

        /// <summary>
        /// 更新配置
        /// </summary>
        /// <param name="config">JSON配置元素</param>
        public void UpdateConfig(JsonElement config)
        {
            var options = new JsonSerializerOptions { PropertyNameCaseInsensitive = true };
            try
            {
                _config = JsonSerializer.Deserialize<TeamSwitchConfig>(config.GetRawText(), options) ?? new TeamSwitchConfig();
                ParseHelperSteamIds();
                ApplyConfig();
            }
            catch (Exception ex)
            {
                RainOpsLog.Log($"[{Name}] UpdateConfig Error: {ex.Message}");
            }
        }

        /// <summary>
        /// 应用配置，根据启用状态订阅或取消订阅事件
        /// </summary>
        private void ApplyConfig()
        {
            Program.OnRconMessageReceived -= OnRconMessage;
            if (_config.Enabled)
            {
                Program.OnRconMessageReceived += OnRconMessage;
            }
        }

        /// <summary>
        /// 重置配置为默认值
        /// </summary>
        public void ResetConfig()
        {
            _config = new TeamSwitchConfig();
            ParseHelperSteamIds();
        }

        /// <summary>
        /// 解析协助者SteamID列表
        /// </summary>
        private void ParseHelperSteamIds()
        {
            lock (_lock)
            {
                _helperSteamIds.Clear();
                if (_config.STBSteamID == null || _config.STBSteamID.Count == 0) return;

                foreach (var id in _config.STBSteamID)
                {
                    if (!string.IsNullOrWhiteSpace(id))
                    {
                        _helperSteamIds.Add(id.Trim());
                    }
                }
            }
        }

        /// <summary>
        /// 释放资源，取消订阅事件
        /// </summary>
        public void Dispose()
        {
            Program.OnRconMessageReceived -= OnRconMessage;
        }

        /// <summary>
        /// 处理RCON消息
        /// </summary>
        /// <param name="msg">消息内容</param>
        private async void OnRconMessage(string msg)
        {
            if (!_config.Enabled) return;

            try
            {
                // 检查地图状态
                CheckMapStatus();

                // 解析聊天
                var (steamId, name, content) = ParseChat(msg);
                if (string.IsNullOrEmpty(steamId)) return;

                content = content.Trim();

                // 1. 检查协助指令
                if (content.StartsWith(_config.STBHelpCMD, StringComparison.OrdinalIgnoreCase))
                {
                    await HandleHelpCommand(steamId, name, content);
                    return;
                }

                // 2. 检查跳边指令
                if (IsSwitchCommand(content))
                {
                    await HandleSwitchRequest(steamId, name, content);
                }
            }
            catch (Exception ex)
            {
                RainOpsLog.Log($"[{Name}] Error: {ex.Message}");
            }
        }

        /// <summary>
        /// 检查地图状态，如果地图更换则重置状态
        /// </summary>
        private void CheckMapStatus()
        {
            var serverInfo = Program.RconCache?.ServerInfo;
            if (serverInfo == null) return;

            string map = serverInfo.MapName_s ?? "";
            if (map != _currentMap)
            {
                lock (_lock)
                {
                    _currentMap = map;
                    _freeUsage.Clear();
                    _pendingHelp.Clear();
                }
                RainOpsLog.Log($"[{Name}] Map changed to {map}. Reset limits.");
            }
        }

        /// <summary>
        /// 解析聊天消息
        /// </summary>
        /// <param name="msg">原始消息</param>
        /// <returns>解析出的SteamID、名字和内容</returns>
        private (string steamId, string name, string content) ParseChat(string msg)
        {
            // 格式 1
            var match = Regex.Match(msg, @"ChatMessage: \[(?<steamId>\d+)\] (?<name>.+) : (?<content>.+)");
            if (!match.Success)
            {
                // 格式 2
                match = Regex.Match(msg, @"\[Chat.+?\] \[Online IDs:EOS: .+? steam: (?<steamId>\d+)\]\s+(?<name>.+?) : (?<content>.+)");
            }

            if (match.Success)
            {
                return (match.Groups["steamId"].Value, match.Groups["name"].Value, match.Groups["content"].Value);
            }
            return (null, null, null);
        }

        /// <summary>
        /// 检查是否为跳边指令
        /// </summary>
        /// <param name="content">聊天内容</param>
        /// <returns>是否匹配</returns>
        private bool IsSwitchCommand(string content)
        {
            if (string.IsNullOrWhiteSpace(_config.LikeKey)) return false;
            
            var keys = _config.LikeKey.Split(new[] { ',', '，' }, StringSplitOptions.RemoveEmptyEntries);
            foreach (var key in keys)
            {
                if (string.IsNullOrWhiteSpace(key)) continue;

                // 精确匹配
                if (content.Equals(key, StringComparison.OrdinalIgnoreCase)) return true;

                // 拼音首字母
                string initials = PinyinHelper.GetInitials(key);
                if (!string.IsNullOrEmpty(initials) && content.Equals(initials, StringComparison.OrdinalIgnoreCase)) return true;
                
                // 全拼
                string pinyin = PinyinHelper.GetPinyin(key);
                if (!string.IsNullOrEmpty(pinyin) && content.Equals(pinyin, StringComparison.OrdinalIgnoreCase)) return true;
            }
            return false;
        }

        /// <summary>
        /// 处理跳边请求
        /// </summary>
        /// <param name="steamId">玩家SteamID</param>
        /// <param name="name">玩家名字</param>
        /// <param name="content">指令内容</param>
        private async Task HandleSwitchRequest(string steamId, string name, string content)
        {
            bool isFree = false;
            string failReason = "";

            lock (_lock)
            {
                // 检查时间
                int matchTime = Program.RconCache?.ServerInfo?.PlayTime_I ?? 999999;
                bool timeValid = matchTime <= _config.STBSecond;
                if (!timeValid) failReason = _config.STBSecondMsg;

                // 检查限制
                if (!_freeUsage.TryGetValue(steamId, out int count)) count = 0;
                bool limitValid = count < _config.LimitExhaustedCount;
                if (!limitValid) failReason = _config.LimitExhaustedMsg;

                if (timeValid && limitValid)
                {
                    isFree = true;
                }
            }

            if (isFree)
            {
                if (await ExecuteSwitch(steamId))
                {
                    lock (_lock)
                    {
                        if (!_freeUsage.ContainsKey(steamId)) _freeUsage[steamId] = 0;
                        _freeUsage[steamId]++;
                    }
                    await SendWarn(steamId, $"已为您更换阵营 (免费额度: {_freeUsage[steamId]}/{_config.LimitExhaustedCount})");
                }
            }
            else
            {
                // 如果不是使用STB指令，则提示错误并返回，不进行扣分尝试
                if (!content.Equals("stb", StringComparison.OrdinalIgnoreCase))
                {
                    await SendWarn(steamId, failReason);
                    return;
                }

                // 尝试扣分
                await SendWarn(steamId, failReason); // 通知为什么免费失败
                
                int points = await PointsService.GetPointsAsync(steamId);
                if (points >= _config.STBIntegrate)
                {
                    if (await PointsService.AdjustPointsAsync(steamId, -_config.STBIntegrate) != 0)
                    {
                        if (await ExecuteSwitch(steamId))
                        {
                            await SendWarn(steamId, $"已消耗 {_config.STBIntegrate} 积分更换阵营 (剩余: {points - _config.STBIntegrate})");
                        }
                        else
                        {
                            // 失败退款？通常比较复杂，假设切换有效或手动退款。
                            // 暂时只记录日志。
                            RainOpsLog.Log($"[{Name}] Switch failed for {steamId} but points deducted.");
                        }
                    }
                }
                else
                {
                    // 积分不足 -> 生成求助码
                    string code = GenerateHelpCode();
                    lock (_lock)
                    {
                        _pendingHelp[code] = steamId;
                    }

                    string helpCmd = $"{_config.STBHelpCMD}{code}";
                    string broadcastMsg = _config.STBHelpMsg
                        .Replace("{Name}", name)
                        .Replace("{Code}", helpCmd);

                    await SendBroadcast(broadcastMsg);
                    await SendWarn(steamId, $"积分不足，已发送求助广播！");
                }
            }
        }

        /// <summary>
        /// 生成随机求助代码
        /// </summary>
        /// <returns>4位随机代码</returns>
        private string GenerateHelpCode()
        {
            // 生成4位随机码
            return _random.Next(1000, 9999).ToString();
        }

        /// <summary>
        /// 处理协助指令
        /// </summary>
        /// <param name="helperSteamId">协助者SteamID</param>
        /// <param name="helperName">协助者名字</param>
        /// <param name="content">指令内容</param>
        private async Task HandleHelpCommand(string helperSteamId, string helperName, string content)
        {
            // content 类似 "hp1234"
            string code = content.Substring(_config.STBHelpCMD.Length).Trim();
            
            // 验证协助者权限
            bool isHelper = false;
            lock (_lock)
            {
                if (_helperSteamIds.Contains(helperSteamId)) isHelper = true;
            }

            if (!isHelper)
            {
                await SendWarn(helperSteamId, "您没有权限执行此操作！");
                return;
            }

            string requesterSteamId = null;
            lock (_lock)
            {
                if (_pendingHelp.TryGetValue(code, out var sid))
                {
                    requesterSteamId = sid;
                    _pendingHelp.Remove(code);
                }
            }

            if (requesterSteamId != null)
            {
                if (await ExecuteSwitch(requesterSteamId))
                {
                    await SendBroadcast($"感谢 {helperName} 协助玩家更换阵营！");
                }
                else
                {
                    await SendWarn(helperSteamId, "操作失败，玩家可能已不在服务器或无法更换。");
                }
            }
            else
            {
                await SendWarn(helperSteamId, "无效的求助代码或请求已过期。");
            }
        }

        /// <summary>
        /// 执行跳边操作
        /// </summary>
        /// <param name="steamId">玩家SteamID</param>
        /// <returns>是否成功</returns>
        private async Task<bool> ExecuteSwitch(string steamId)
        {
            if (Program.Client != null && Program.Client.IsConnected)
            {
                // Squad AdminForceTeamChange 逻辑
                // 命令: AdminForceTeamChange <SteamId>
                // 注意: 这会杀死玩家并切换队伍。
                string cmd = $"AdminForceTeamChange \"{steamId}\"";
                await Program.Client.SendCommandAsync(cmd);
                return true;
            }
            return false;
        }

        /// <summary>
        /// 发送警告消息给玩家
        /// </summary>
        /// <param name="steamId">玩家SteamID</param>
        /// <param name="msg">消息内容</param>
        private async Task SendWarn(string steamId, string msg)
        {
            if (Program.Client != null && Program.Client.IsConnected)
            {
                await Program.Client.SendCommandAsync($"AdminWarn \"{steamId}\" \"{msg}\"");
            }
        }

        /// <summary>
        /// 发送全服广播
        /// </summary>
        /// <param name="msg">广播内容</param>
        private async Task SendBroadcast(string msg)
        {
            if (Program.Client != null && Program.Client.IsConnected)
            {
                await Program.Client.SendCommandAsync($"AdminBroadcast \"{msg}\"");
            }
        }
    }
}