using System;
using System.Linq;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Hosting;
using RainOpsMini.Helpers;
using RainOpsMini.Helpers.RCON;
using RainOpsMini.Models;

namespace RainOpsMini.Plugins
{
    /// <summary>
    /// AFK 踢人插件：自动清理长时间未加入小队的玩家
    /// </summary>
    public class AfkKickPlugin : BackgroundService, IPlugin
    {
        public string Name => "自动清理挂机";
        public string Description => "自动清理挂机（未加入小队）的玩家";
        public PluginCategory Category => PluginCategory.BasicFunction;
        public bool IsEnabled => _config.Enabled;

        private AfkKickConfig _config = new AfkKickConfig();

        // 配置模型类
        public class AfkKickConfig
        {
            /// <summary>
            /// 是否启用
            /// </summary>
            public bool Enabled { get; set; } = false;

            /// <summary>
            /// 插件启动时广播的消息 (为空则不广播)
            /// </summary>
            public string StartMsg { get; set; } = "本服务器已启用自动清理挂机插件，请及时加入小队";

            /// <summary>
            /// 每次检查间隔周期（秒）
            /// </summary>
            public int CheckIntervalSeconds { get; set; } = 60;

            /// <summary>
            /// 二次确认等待时间（秒）：发现未入队玩家后，等待多久再次确认
            /// </summary>
            public int RecheckDelaySeconds { get; set; } = 60;

            /// <summary>
            /// 开启人员最小数
            /// </summary>
            public int MinServerPlayers { get; set; } = 80;

            /// <summary>
            /// 每次踢出人数
            /// </summary>
            public int MaxKicksPerRun { get; set; } = 3;

            /// <summary>
            /// 是否对未加入小队的玩家提醒尽快加入
            /// </summary>
            public bool WarnBeforeKick { get; set; } = true;

            /// <summary>
            /// 提醒内容
            /// </summary>
            public string WarningMessage { get; set; } = "您尚未加入小队！请尽快加入小队，否则将在 {0} 秒后被踢出。";

            /// <summary>
            /// 踢出后显示提示
            /// </summary>
            public string KickReason { get; set; } = "AFK / 长时间未加入小队";

            /// <summary>
            /// 白名单（永不踢出人员）
            /// </summary>
            public List<string> WhitelistSteamIds { get; set; } = new List<string>();
        }

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

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

        /// <summary>
        /// 更新配置
        /// </summary>
        /// <param name="config">JSON 格式的配置元素</param>
        public void UpdateConfig(JsonElement config)
        {
            try
            {
                var options = new JsonSerializerOptions
                {
                    PropertyNameCaseInsensitive = true
                };
                var newConfig = JsonSerializer.Deserialize<AfkKickConfig>(config.GetRawText(), options);
                if (newConfig != null)
                {
                    _config = newConfig;
                }
            }
            catch (Exception ex)
            {
                RainOpsLog.Log($"[AfkKick] 配置更新失败: {ex.Message}");
            }
        }

        /// <summary>
        /// 后台任务执行入口，周期性检查挂机玩家
        /// </summary>
        /// <param name="stoppingToken">取消令牌</param>
        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            RainOpsLog.Log($"[{Name}] 插件服务已启动 (检测间隔: {_config.CheckIntervalSeconds}秒)");

            // 插件启动时广播消息
            if (_config.Enabled && !string.IsNullOrWhiteSpace(_config.StartMsg))
            {
                // 等待一小会儿确保 RCON 连接就绪（可选，取决于程序启动顺序）
                await Task.Delay(5000, stoppingToken);
                try 
                {
                    if (Program.Client != null && Program.Client.IsConnected)
                    {
                         await Program.Client.SendCommandAsync($"Broadcast {_config.StartMsg}");
                    }
                }
                catch (Exception ex)
                {
                    RainOpsLog.Log($"[{Name}] 启动广播失败: {ex.Message}");
                }
            }

            while (!stoppingToken.IsCancellationRequested)
            {
                if (_config.Enabled)
                {
                    try
                    {
                        await CheckAndKickAsync();
                    }
                    catch (Exception ex)
                    {
                        RainOpsLog.Log($"[AfkKick] 错误: {ex.Message}");
                    }
                }

                // 获取检查间隔，确保不小于 5 秒以避免高负载
                int delay = _config.CheckIntervalSeconds;
                if (delay < 5) delay = 5; 
                await Task.Delay(TimeSpan.FromSeconds(delay), stoppingToken);
            }
        }

        /// <summary>
        /// 检查并踢出挂机玩家的核心逻辑
        /// </summary>
        private async Task CheckAndKickAsync()
        {
            var client = Program.Client;
            if (client == null || !client.IsConnected) return;

            // 1. 获取第一轮数据
            var players = Program.RconCache.Players.ToList();
            var serverInfo = Program.RconCache.ServerInfo;

            if (players == null || serverInfo == null) return;

            // 检查服务器当前人数是否达到开启阈值
            if (int.TryParse(serverInfo.PlayerCount_I, out int count) && count < _config.MinServerPlayers)
            {
                return;
            }

            // 识别 AFK/未分配小队的玩家
            var targets = players.Where(p => 
                (p.TeamId == 0 || p.SquadId == null) && // 未分配阵营 或 未加入小队
                !_config.WhitelistSteamIds.Contains(p.SteamId)
            ).ToList();

            if (targets.Count == 0) return;

            // 2. 发送警告并等待
            if (_config.WarnBeforeKick)
            {
                foreach (var player in targets)
                {
                    string msg = string.Format(_config.WarningMessage, _config.RecheckDelaySeconds);
                    await client.SendCommandAsync($"AdminWarn \"{player.SteamId}\" \"{msg}\"");
                }
            }

            // 等待二次确认时间
            int waitMs = _config.RecheckDelaySeconds * 1000;
            if (waitMs < 1000) waitMs = 1000;
            await Task.Delay(waitMs);

            // 3. 获取第二轮数据（最新数据）
            // 注意：这里需要确保 RCON 缓存已更新，或者强制刷新。
            // 建议：RecheckDelaySeconds 应该大于 RCON 缓存刷新间隔。
            
            var currentPlayers = Program.RconCache.Players;
            if (currentPlayers == null) return; // 无法获取最新数据，放弃本次操作

            // 再次筛选
            var currentTargets = currentPlayers.Where(p => 
                (p.TeamId == 0 || p.SquadId == null) && 
                !_config.WhitelistSteamIds.Contains(p.SteamId)
            ).ToList();

            // 4. 计算交集：仍在未入队名单中的玩家
            var targetSteamIds = targets.Select(t => t.SteamId).ToHashSet();
            var finalKickList = currentTargets.Where(p => targetSteamIds.Contains(p.SteamId)).ToList();

            int kickedCount = 0;

            foreach (var player in finalKickList)
            {
                // 限制每次运行的最大踢出人数
                if (kickedCount >= _config.MaxKicksPerRun) break;

                RainOpsLog.Log($"[AfkKick] 正在踢出 {player.Name} ({player.SteamId}) - 长时间未入队");
                await client.SendCommandAsync($"Kick \"{player.SteamId}\" \"{_config.KickReason}\"");
                kickedCount++;
            }

            // 5. 任务执行完毕后广播清理人数
            if (kickedCount > 0)
            {
                await client.SendCommandAsync($"Broadcast 自动清理挂机玩家: {kickedCount} 人");
            }
        }
    }
}