using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.Json;
using System.Threading.Tasks;
using RainOpsMini.Helpers;
using RainOpsMini.Helpers.RCON;
using RainOpsMini.Services;
using RainOpsMini;
using RainOpsMini.Models;

namespace RainOpsMini.Plugins
{
    public class RedemptionPlugin : IPlugin, IDisposable
    {
        public string Name => "积分兑换插件";
        public string Description => "允许玩家使用积分兑换VIP或SVIP权限";
        public PluginCategory Category => PluginCategory.PointsFunction;
        public bool IsEnabled => _config.Enabled;

        private RedemptionConfig _config = new RedemptionConfig();
        private readonly string _configPath;

        public RedemptionPlugin()
        {
            _configPath = Path.Combine(Environment.CurrentDirectory, "PluginConfig", "RedemptionConfig.json");
            LoadConfig();
            Program.OnRconMessageReceived += OnRconMessage;
        }

        public object GetConfig() => _config;

        public void UpdateConfig(JsonElement config)
        {
            try
            {
                var options = new JsonSerializerOptions { PropertyNameCaseInsensitive = true };
                _config = JsonSerializer.Deserialize<RedemptionConfig>(config.GetRawText(), options) ?? new RedemptionConfig();
                SaveConfig();
            }
            catch (Exception ex)
            {
                RainOpsLog.Log($"[RedemptionPlugin] UpdateConfig Error: {ex.Message}");
            }
        }

        public void ResetConfig()
        {
            _config = new RedemptionConfig();
            SaveConfig();
        }

        private void LoadConfig()
        {
            try
            {
                if (File.Exists(_configPath))
                {
                    var json = File.ReadAllText(_configPath);
                    var options = new JsonSerializerOptions { PropertyNameCaseInsensitive = true };
                    _config = JsonSerializer.Deserialize<RedemptionConfig>(json, options) ?? new RedemptionConfig();
                }
                else
                {
                    SaveConfig();
                }
            }
            catch (Exception ex)
            {
                RainOpsLog.Log($"[RedemptionPlugin] LoadConfig Error: {ex.Message}");
            }
        }

        private void SaveConfig()
        {
            try
            {
                var dir = Path.GetDirectoryName(_configPath);
                if (!Directory.Exists(dir)) Directory.CreateDirectory(dir);

                var options = new JsonSerializerOptions { WriteIndented = true };
                var json = JsonSerializer.Serialize(_config, options);
                File.WriteAllText(_configPath, json);
            }
            catch (Exception ex)
            {
                RainOpsLog.Log($"[RedemptionPlugin] SaveConfig Error: {ex.Message}");
            }
        }

        private async void OnRconMessage(string msg)
        {
            if (!_config.Enabled) return;

            try
            {
                var chatMsg = RconParser.ParseChatMessage(msg);
                if (chatMsg == null) return;

                string content = chatMsg.Message.Trim();
                
                // List Command
                if (content.Equals(_config.ListCommand, StringComparison.OrdinalIgnoreCase))
                {
                    await HandleListCommand(chatMsg.SteamId);
                    return;
                }

                // Redeem Command
                if (content.StartsWith(_config.RedeemCommand, StringComparison.OrdinalIgnoreCase))
                {
                    string param = content.Substring(_config.RedeemCommand.Length).Trim();
                    if (int.TryParse(param, out int index))
                    {
                        await HandleRedeemCommand(chatMsg.SteamId, chatMsg.Name, index);
                    }
                    else if (string.IsNullOrWhiteSpace(param))
                    {
                         // If user just types "Redeem", maybe show list? Or help?
                         // Let's show list for convenience
                         await HandleListCommand(chatMsg.SteamId);
                    }
                }
            }
            catch (Exception ex)
            {
                RainOpsLog.Log($"[RedemptionPlugin] OnRconMessage Error: {ex.Message}");
            }
        }

        private async Task HandleListCommand(string steamId)
        {
            if (_config.Options == null || _config.Options.Count == 0)
            {
                await SendWarn(steamId, "当前没有任何可兑换的选项。");
                return;
            }

            var points = await PointsService.GetPointsAsync(steamId);
            
            // 1. 发送标题和积分
            await SendWarn(steamId, $"【积分兑换列表】 (当前积分: {points})");
            await Task.Delay(200);

            // 2. 逐条发送选项
            for (int i = 0; i < _config.Options.Count; i++)
            {
                var opt = _config.Options[i];
                await SendWarn(steamId, $"{i + 1}. {opt.Name} - {opt.Cost}积分 ({opt.Description})");
                await Task.Delay(200);
            }

            // 3. 发送操作提示
            await SendWarn(steamId, $"请输入 '{_config.RedeemCommand} + 序号' 进行兑换，例如: {_config.RedeemCommand} 1");
        }

        private async Task HandleRedeemCommand(string steamId, string playerName, int index)
        {
            if (_config.Options == null || index < 1 || index > _config.Options.Count)
            {
                await SendWarn(steamId, "无效的兑换序号。");
                return;
            }

            var option = _config.Options[index - 1];
            
            // 1. Check Points
            int currentPoints = await PointsService.GetPointsAsync(steamId);
            if (currentPoints < option.Cost)
            {
                await SendWarn(steamId, $"积分不足！需要 {option.Cost} 积分，当前拥有 {currentPoints} 积分。");
                return;
            }

            // 2. Deduct Points
            await PointsService.AdjustPointsAsync(steamId, -option.Cost);

            // 3. Apply VIP/SVIP
            try
            {
                ApplyVip(steamId, playerName, option);
                await SendWarn(steamId, $"兑换成功！消耗 {option.Cost} 积分，获得 {option.Name}。");
                RainOpsLog.Log($"[Redemption] Player {playerName}({steamId}) redeemed {option.Name} for {option.Cost} points.");
            }
            catch (Exception ex)
            {
                // Refund if failed (optional, but good practice)
                await PointsService.AdjustPointsAsync(steamId, option.Cost);
                RainOpsLog.Log($"[Redemption] Error applying VIP for {steamId}: {ex.Message}");
                await SendWarn(steamId, "兑换发生错误，积分已退回，请联系管理员。");
            }
        }

        private void ApplyVip(string steamId, string playerName, RedemptionOption option)
        {
            var existingVip = VipStorage.GetBySteamId(steamId);

            DateTime? currentVipExpiry = null;
            DateTime? currentSvipExpiry = null;
            string finalGroup = "";
            DateTime finalExpiry = DateTime.MinValue;

            // Load existing expiries
            if (existingVip != null)
            {
                currentVipExpiry = existingVip.VipExpiryDate;
                currentSvipExpiry = existingVip.SvipExpiryDate;

                // Migration/Fallback logic similar to CdkService
                if (currentVipExpiry == null && currentSvipExpiry == null)
                {
                     // Legacy support or just simple ExpiryDate
                     if (existingVip.Group == "SVIP_RainOpsMini") currentSvipExpiry = existingVip.ExpiryDate;
                     else currentVipExpiry = existingVip.ExpiryDate;
                }
            }

            // Calculate new expiries
            bool isSvip = option.Group == "SVIP_RainOpsMini";
            DateTime now = DateTime.Now;

            if (isSvip)
            {
                if (currentSvipExpiry.HasValue && currentSvipExpiry.Value > now)
                {
                    currentSvipExpiry = currentSvipExpiry.Value.AddDays(option.DurationDays);
                }
                else
                {
                    currentSvipExpiry = now.AddDays(option.DurationDays);
                }
            }
            else // VIP
            {
                if (currentVipExpiry.HasValue && currentVipExpiry.Value > now)
                {
                    currentVipExpiry = currentVipExpiry.Value.AddDays(option.DurationDays);
                }
                else
                {
                    currentVipExpiry = now.AddDays(option.DurationDays);
                }
            }

            // Determine final group and expiry for the main fields
            bool hasActiveSvip = currentSvipExpiry.HasValue && currentSvipExpiry.Value > now;
            bool hasActiveVip = currentVipExpiry.HasValue && currentVipExpiry.Value > now;

            if (hasActiveSvip)
            {
                finalGroup = "SVIP_RainOpsMini";
                finalExpiry = currentSvipExpiry.Value;
            }
            else if (hasActiveVip)
            {
                finalGroup = "VIP_RainOpsMini";
                finalExpiry = currentVipExpiry.Value;
            }
            else
            {
                // Should not happen if we just added time
                finalGroup = option.Group;
                finalExpiry = now.AddDays(option.DurationDays);
            }

            // Save
            if (existingVip != null)
            {
                existingVip.Group = finalGroup;
                existingVip.ExpiryDate = finalExpiry;
                existingVip.VipExpiryDate = currentVipExpiry;
                existingVip.SvipExpiryDate = currentSvipExpiry;
                existingVip.Remark = $"积分兑换: {option.Name}";
                VipStorage.Update(existingVip); // Should trigger save
            }
            else
            {
                var newVip = new VipMember
                {
                    SteamId = steamId,
                    Name = playerName,
                    Group = finalGroup,
                    ExpiryDate = finalExpiry,
                    VipExpiryDate = currentVipExpiry,
                    SvipExpiryDate = currentSvipExpiry,
                    Remark = $"积分兑换: {option.Name}",
                    CreatedAt = DateTime.Now
                };
                VipStorage.Add(newVip);
            }

            // Sync to server config
            try 
            {
                string cfgPath = System.IO.Path.Combine(Environment.CurrentDirectory, "SquadGame", "ServerConfig", "Admins.cfg");
                VipStorage.SyncToAdminConfig(cfgPath);
            }
            catch (Exception ex)
            {
                RainOpsLog.Log($"[Redemption] Sync Admin Config Failed: {ex.Message}");
            }
        }

        private async Task SendWarn(string steamId, string message)
        {
            if (Program.Client != null && Program.Client.IsConnected)
            {
                // 防止消息中的双引号破坏RCON命令结构
                message = message.Replace("\"", "'");
                // 移除换行符
                message = message.Replace("\r", "").Replace("\n", " ");
                
                await Program.Client.SendCommandAsync($"AdminWarn \"{steamId}\" \"{message}\"");
            }
        }

        public void Dispose()
        {
            Program.OnRconMessageReceived -= OnRconMessage;
        }
    }
}