using System;
using System.Collections.Generic;
using asap.core;
using UnityEngine;

namespace Activity
{
    /// <summary>
    /// <see cref="Services.IEventTokenService"/> 入账/扣账成功后由 <see cref="Services.EventTokenService"/> 发布，
    /// 供各活动自行判断是否刷新入口合并红点等（避免订阅者与具体玩法耦合）。
    /// </summary>
    public readonly struct ActivityEventTokenBalanceChanged
    {
        public int EventId { get; }

        public ActivityEventTokenBalanceChanged(int eventId)
        {
            EventId = eventId;
        }
    }
}

namespace Activity.Services
{
    /// <summary>
    /// 活动代币服务实现
    /// 负责管理所有活动的代币数据，提供统一的存储接口
    /// </summary>
    public class EventTokenService : IEventTokenService
    {
        #region 常量与字段

        private const string TransitionDataKey = "TransitionData";

        private readonly Dictionary<int, int> _tokenData = new Dictionary<int, int>();
        private readonly object _lock = new object();
        private bool _isInitialized = false;
        #endregion

        #region 初始化

        /// <summary>
        /// 初始化服务，从 PlayFab 加载代币数据
        /// </summary>
        public void Initialize()
        {
            if (_isInitialized) return;

            lock (_lock)
            {
                if (_isInitialized) return;

                try
                {
                    // 从 PlayFab 加载数据
                    LoadFromPlayFab();
                    
                    _isInitialized = true;

#if UNITY_EDITOR
                    Debug.Log($"[EventTokenService] Initialized successfully. Token count: {_tokenData.Count}");
#endif
                }
                catch (Exception e)
                {
                    Debug.LogError($"[EventTokenService] Initialization failed: {e.Message}\n{e.StackTrace}");
                }
            }
        }

        /// <summary>
        /// 从 PlayFab 加载代币数据
        /// </summary>
        private void LoadFromPlayFab()
        {
            try
            {
                var dataStr = PlayFabMgr.Instance?.GetLocalData(TransitionDataKey);
                if (!string.IsNullOrEmpty(dataStr))
                {
                    _tokenData.Clear();
                    var data = Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<int, int>>(dataStr);
                    if (data != null)
                    {
                        foreach (var kvp in data)
                        {
                            _tokenData[kvp.Key] = kvp.Value;
                        }
                    }
                }
#if UNITY_EDITOR
                Debug.Log($"[EventTokenService] Loaded {_tokenData.Count} token entries from PlayFab");
#endif
            }
            catch (Exception e)
            {
                Debug.LogError($"[EventTokenService] Failed to load from PlayFab: {e.Message}");
            }
        }

        /// <summary>
        /// 保存数据到 PlayFab
        /// </summary>
        private void SaveToPlayFab()
        {
            try
            {
                var json = Newtonsoft.Json.JsonConvert.SerializeObject(_tokenData);
                PlayFabMgr.Instance?.UpdateUserDataValue(TransitionDataKey, json);
#if UNITY_EDITOR
                Debug.Log($"[EventTokenService] Saved {_tokenData.Count} token entries to PlayFab");
#endif
            }
            catch (Exception e)
            {
                Debug.LogError($"[EventTokenService] Failed to save to PlayFab: {e.Message}");
                throw;
            }
        }

        #endregion

        #region 基础操作

        public void AddToken(int eventId, int count)
        {
            if (eventId <= 0)
            {
                Debug.LogWarning($"[EventTokenService] Invalid eventId: {eventId}");
                return;
            }

            if (count == 0)
                return;

            lock (_lock)
            {
                try
                {
                    EnsureInitialized();
                    var currentCount = GetTokenCount(eventId);
                    _tokenData[eventId] = currentCount + count;
                    SaveToPlayFab();

#if UNITY_EDITOR
                    Debug.Log($"[EventTokenService] Added {count} tokens to event {eventId}, new total: {_tokenData[eventId]}");
#endif
                }
                catch (Exception e)
                {
                    Debug.LogError($"[EventTokenService] AddToken failed for event {eventId}: {e.Message}");
                    throw;
                }
            }

            PublishActivityEventTokenBalanceChanged(eventId);
        }

        public int RemoveToken(int eventId, int count)
        {
            if (eventId <= 0)
            {
                Debug.LogWarning($"[EventTokenService] Invalid eventId: {eventId}");
                return 0;
            }

            int actualRemoved = 0;
            lock (_lock)
            {
                try
                {
                    EnsureInitialized();
                    var currentCount = GetTokenCount(eventId);
                    actualRemoved = Mathf.Min(count, currentCount);
                    var newCount = currentCount - actualRemoved;

                    if (newCount <= 0)
                    {
                        _tokenData.Remove(eventId);
                    }
                    else
                    {
                        _tokenData[eventId] = newCount;
                    }

                    SaveToPlayFab();

#if UNITY_EDITOR
                    Debug.Log($"[EventTokenService] Removed {actualRemoved} tokens from event {eventId}, remaining: {newCount}");
#endif
                }
                catch (Exception e)
                {
                    Debug.LogError($"[EventTokenService] RemoveToken failed for event {eventId}: {e.Message}");
                    throw;
                }
            }

            PublishActivityEventTokenBalanceChanged(eventId);

            return actualRemoved;
        }

        public int GetTokenCount(int eventId)
        {
            if (eventId <= 0) return 0;

            lock (_lock)
            {
                try
                {
                    EnsureInitialized();
                    return _tokenData.GetValueOrDefault(eventId, 0);
                }
                catch (Exception e)
                {
                    Debug.LogError($"[EventTokenService] GetTokenCount failed for event {eventId}: {e.Message}");
                    return 0;
                }
            }
        }

        public void SetToken(int eventId, int count)
        {
            if (eventId <= 0)
            {
                Debug.LogWarning($"[EventTokenService] Invalid eventId: {eventId}");
                return;
            }

            lock (_lock)
            {
                try
                {
                    EnsureInitialized();
                    _tokenData[eventId] = count;
                    SaveToPlayFab();

#if UNITY_EDITOR
                    Debug.Log($"[EventTokenService] Set event {eventId} token count to {count}");
#endif
                }
                catch (Exception e)
                {
                    Debug.LogError($"[EventTokenService] SetToken failed for event {eventId}: {e.Message}");
                    throw;
                }
            }
        }

        public void ClearToken(int eventId)
        {
            if (eventId <= 0) return;

            lock (_lock)
            {
                try
                {
                    EnsureInitialized();
                    if (_tokenData.Remove(eventId))
                    {
                        SaveToPlayFab();
                    }
                }
                catch (Exception e)
                {
                    Debug.LogError($"[EventTokenService] ClearToken failed for event {eventId}: {e.Message}");
                    throw;
                }
            }
        }

        #endregion

        #region 批量操作

        public Dictionary<int, int> GetAllTokens()
        {
            lock (_lock)
            {
                EnsureInitialized();
                return new Dictionary<int, int>(_tokenData);
            }
        }

        public void SetTokens(Dictionary<int, int> tokens)
        {
            if (tokens == null) return;

            lock (_lock)
            {
                try
                {
                    EnsureInitialized();
                    _tokenData.Clear();
                    foreach (var kvp in tokens)
                    {
                        if (kvp.Key > 0)
                        {
                            _tokenData[kvp.Key] = kvp.Value;
                        }
                    }
                    SaveToPlayFab();

#if UNITY_EDITOR
                    Debug.Log($"[EventTokenService] Set {tokens.Count} token entries");
#endif
                }
                catch (Exception e)
                {
                    Debug.LogError($"[EventTokenService] SetTokens failed: {e.Message}");
                    throw;
                }
            }
        }

        public void ClearTokens(IEnumerable<int> eventIds)
        {
            if (eventIds == null) return;

            lock (_lock)
            {
                try
                {
                    EnsureInitialized();
                    bool changed = false;
                    foreach (var eventId in eventIds)
                    {
                        if (_tokenData.Remove(eventId))
                        {
                            changed = true;
                        }
                    }
                    if (changed)
                    {
                        SaveToPlayFab();
                    }
                }
                catch (Exception e)
                {
                    Debug.LogError($"[EventTokenService] ClearTokens failed: {e.Message}");
                    throw;
                }
            }
        }

        #endregion

        #region 私有辅助方法

        private void EnsureInitialized()
        {
            if (!_isInitialized)
            {
                Initialize();
            }
        }

        private static void PublishActivityEventTokenBalanceChanged(int eventId)
        {
            try
            {
                GContext.Publish(new Activity.ActivityEventTokenBalanceChanged(eventId));
            }
            catch
            {
                // GContext 未就绪等
            }
        }

        #endregion
    }
}