using System.Collections.Generic;
using DotRecast.Core.Collections;
using UnityEngine;
using NotImplementedException = System.NotImplementedException;

namespace JNGame.Sync.System.Data
{

    public enum SStateDataEnum
    {
        Server,
        Client,
        ServerClient,
    }

    public abstract class ISStateData : ISData
    {
        
        /// <summary>
        /// 返回Byte数组
        /// </summary>
        /// <returns></returns>
        public abstract byte[] GetByte();

        /// <summary>
        /// 返回差值Byte
        /// </summary>
        /// <param name="diffValue"></param>
        /// <returns></returns>
        public abstract byte[] GetByteDifference(ISData diffValue = null);

        /// <summary>
        /// 更新字节
        /// </summary>
        /// <param name="bytes"></param>
        public abstract void UByte(byte[] bytes);
        
    }

    public interface ISStateDataSystem
    {
        
        //网络Id (用于确定网络通讯时找到这个数据系统)
        public int NetID { get; }
        
        /// <summary>
        /// 插入字节
        /// </summary>
        public void OnInsertUBytes(Dictionary<ulong, byte[]> bytes);

        /// <summary>
        /// 获取全部字节
        /// </summary>
        public Dictionary<ulong, byte[]> GetDataBytes();

    }
    
    /// <summary>
    /// 状态同步的数据系统 (支持网络数据)
    /// 注意：帧同步也可以使用不过不建议 因为会有额外开销 除非你的游戏 经常在帧同步或者状态同步之间切换
    /// </summary>
    public abstract class SStateDataSystem<T> : SDataSystem<T>,ISStateDataSystem where T : ISStateData,new()
    {

        public abstract int NetID { get; }
        
        //网络通讯的更新字节数据
        protected Dictionary<ulong, byte[]> UBytes = new();

        public SStateDataEnum Type;

        public bool isServer => Type is SStateDataEnum.ServerClient or SStateDataEnum.Server;
        public bool isClient => Type is SStateDataEnum.ServerClient or SStateDataEnum.Client;
        
        //待插入的数据
        protected Queue<Dictionary<ulong, byte[]>> WaitUBytes = new ();

        protected SStateDataSystem(SStateDataEnum type)
        {
            Type = type;
        }


        public override void OnSyncUpdate(int dt)
        {
            while (WaitUBytes.Count > 0)
            {
                OnUByteUpdate(WaitUBytes.Dequeue());
            }
            
            //服务器: 发送最近数据
            if (isServer)
            {
                var latest = GetLatest();
                latest.Keys.ForEach(key =>
                {
                    if (Data.ContainsKey(key))
                    {
                        //更新数据
                        Update(latest[key]);
                    }
                    else
                    {
                        //如果之前没有则添加
                        Add(latest[key]);
                    }
                });
                Data.ForEach(child =>
                {
                    //没有则删除
                    if (!(latest.ContainsKey(child.Key))) Delete(child.Key);
                });
                if (UBytes.Count > 0)
                {
                    OnUByteUpdate(UBytes);
                    OnSendUBytes(UBytes);
                    UBytes.Clear();
                }
            }

        }

        /// <summary>
        /// 发送字节数据
        /// </summary>
        /// <param name="bytes"></param>
        /// <returns>是否清空UBytes</returns>
        public abstract void OnSendUBytes(Dictionary<ulong, byte[]> bytes);

        /// <summary>
        /// 插入字节
        /// </summary>
        /// <returns></returns>
        public void OnInsertUBytes(Dictionary<ulong, byte[]> bytes)
        {
            if (bytes is not null)
            {
                WaitUBytes.Enqueue(bytes);
            }
            else
            {
                Debug.Log("有数据是空");
            }
        }

        /// <summary>
        /// 获取全部字节
        /// </summary>
        public Dictionary<ulong, byte[]> GetDataBytes()
        {
            var data = new Dictionary<ulong, byte[]>();

            lock (Data)
            {
                
                Data.ForEach(child =>
                {
                    data[child.Key] = child.Value.GetByte();
                });
                
            }

            return data;

        }

        /// <summary>
        /// 将UByte提交更新
        /// </summary>
        public virtual void OnUByteUpdate(Dictionary<ulong, byte[]> bytes)
        {
            if (bytes is null) return;
            lock (Data)
            {
                foreach (var info in bytes)
                {
                    if (SDByteOperate.IsDelete(info.Value))
                    {
                        Data.Remove(info.Key);
                    }
                    else
                    {
                    
                        if (Data.TryGetValue(info.Key, out var value))
                        {
                            value.UByte(info.Value);
                        }
                        else
                        {
                            Data[info.Key] = NewObject(info.Key,info.Value);
                        }
                    
                    }
                }
            }
            
        }

        /// <summary>
        /// Byte解析新对象
        /// </summary>
        /// <param name="id"></param>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public T NewObject(ulong id,byte[] bytes)
        {
            var data = new T();
            data.Id = id;
            data.UByte(bytes);
            return data;
        }
        
        /// <summary>
        /// 刷新数据
        /// </summary>
        public virtual void Update(T data)
        {
            if (Data.TryGetValue(data.Id, out var value))
            {
                var diff = value.GetByteDifference(data);
                if (diff.Length > 0)
                {
                    UBytes[data.Id] = diff;
                }
            }
            else
            {
                UBytes[data.Id] = data.GetByte();
            }
        }

        /// <summary>
        /// 添加数据
        /// </summary>
        public virtual void Add(T data)
        {
            UBytes[data.Id] = data.GetByte();
        }

        /// <summary>
        /// 删除数据
        /// </summary>
        public virtual void Delete(ulong id)
        {
            UBytes[id] = SDByteOperate.DELETE;
        }

    }
}