#if NET5_0_OR_GREATER
#else
using UnityEngine;
#endif
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Cysharp.Threading.Tasks;
using MemoryPack;
using Microsoft.SqlServer.Server;
#if NET5_0_OR_GREATER
using Microsoft.SqlServer.Server;
#endif
using Newtonsoft.Json;

namespace BITKit
{
    public class BITBinary
    {
        private static readonly Dictionary<string, INetMessageReader> netReaders = new();
        public static readonly List<Type> serializableTypes = new();

        public static async UniTask Start()
        {
            netReaders.Clear();
#if NET5_0_OR_GREATER
            serializableTypes.Clear();
#endif
            var stringBuilder = new StringBuilder();
            foreach (var x in await ReflectionHelper.GetInstances<INetMessageReader>())
            {
                var typeName = x.GetMessageType().FullName;
                if (typeName == null) continue;
                netReaders.Add(typeName, x);
                stringBuilder.AppendLine(typeName);
            }
        
            var serializes = await ReflectionHelper.GetInstances<IBinarySerialize>();
#if NET5_0_OR_GREATER
            #else
                serializes = serializes.Where(x => x.GetType().IsAssignableFrom(typeof(UnityEngine.Object)) is false);
            #endif
               foreach (var x in serializes)
            {
                serializableTypes.Add(x.GetType());
                //BIT4Log.Log<BITBinary>($"已注册类型:{x.GetType().FullName}");
                stringBuilder.AppendLine(x.GetType().FullName);
            }
               
               BIT4Log.Log<BITBinary>($"已注册类型:\n{stringBuilder}");
        }

        public static T Read<T>(byte[] buffer) => (T)ReadAsValue(buffer);
        public static object ReadAsValue(byte[] buffer)
        {
            using var ms = new MemoryStream(buffer);
            using var reader = new BinaryReader(ms);
            return Read(reader);
        }

        public static object Read(BinaryReader reader)
        {
            // 检测是否为数组
            if (reader.ReadBoolean())
            {
                //读取数组类型的名称
                var arrayTypeName = reader.ReadString();
                //获取数组类型
                var arrayType = BITSharp.GetTypeFromFullName(arrayTypeName);
                if(string.IsNullOrEmpty(arrayTypeName) || arrayType is null)
                    throw new Exception($"未找到类型:{arrayTypeName}");
                //创建数组实例
                var arrayLength = reader.ReadInt32();
                var array = Array.CreateInstance(arrayType, arrayLength);
                //循环Reader
                for (var i = 0; i < array.Length; i++)
                {
                    //设置值
                    array.SetValue(ReadInternel(reader),i);
                }
                //返回数组
                return array;
            }

            return ReadInternel(reader);

            object ReadInternel(BinaryReader reader)
            {
                if (reader.ReadBoolean() is false)
                {
                    return null;
                }
                
                var typeName = reader.ReadString();
                
                if (netReaders.TryGetValue(typeName, out var netReader))
                    return netReader.ReadBinaryAsObject(reader);

                var type = BITSharp.GetTypeFromFullName(typeName);

                if (type is null)
                {
                    throw new Exception($"反序列化时未找到类型:{typeName}");
                }
                
                var instance = System.Activator.CreateInstance(type);
              
                if (instance is IBinarySerialize serialize)
                {
                    serialize.Read(reader);
                    return instance;
                }

                if (BITSharp.TryGetTypeFromFullName(typeName, out type))
                {
                    return MemoryPackSerializer.Deserialize(type, reader.ReadBytes(reader.ReadInt32()));
                }

                // var json = reader.ReadString();
                // if (string.IsNullOrEmpty(json))
                // {
                //     throw new Exception($"从二进制中读取的json值为空");
                // }
                //
                // try
                // {
                //     if (BITSharp.TryGetTypeFromFullName(typeName, out type))
                //     return JsonConvert.DeserializeObject(json, type);
                // }
                // catch (Exception e)
                // {
                //     BIT4Log.Warning<BITBinary>($"反序列化失败,类型:{typeName},值:\n{json}");
                //     BIT4Log.LogException(e);
                // }

                throw new Exception("未找到读取该二进制的BinaryReader");
            }
        }

        public static byte[] WriteAsBytes(object value)
        {
            using var ms = new MemoryStream();
            using var writer = new BinaryWriter(ms);
            Write(writer, value);
            return ms.ToArray();
        }
        public static void Write(BinaryWriter writer, object value)
        {
            try
            {
                if (value is not string && value is IList enumerable)
                {
                    var pars = enumerable.Cast<object>().ToArray();
                    writer.Write(true);
                    writer.Write(value.GetType().GetElementType()!.FullName!);
                    writer.Write(pars.Length);
                    foreach (var obj in pars)
                    {
                        WriteInterel(writer, obj);
                    }
                }
                else
                {
                    writer.Write(false);
                    WriteInterel(writer,value);
                }
                return;
                void WriteInterel(BinaryWriter writer, object value)
                {
                    if (value is null)
                    {
                        writer.Write(false);
                        return;
                    }
                    var typeName = value.GetType().FullName;
                    writer.Write(typeName!);
                    if (netReaders.TryGetValue(typeName, out var netReader))
                    {
                        netReader.WriteBinaryAsObject(writer,value);
                    }
                    else if (value is IBinarySerialize serialize)
                    {
                        serialize.Write(writer);
                    }
                    else
                    {
                        try
                        {
                            var bytes = MemoryPackSerializer.Serialize(value.GetType(),value);
                            writer.Write(bytes.Length);
                            writer.Write(bytes);
                            
                            //writer.Write(JsonConvert.SerializeObject(value));
                        }
                        catch (Exception)
                        {
                            BIT4Log.Warning<BITBinary>(typeName);
                            throw;
                        }
               
                    }

                }
            }
            catch (Exception e)
            {
                throw;
            }
           
        }
        public static bool IsSupport(object obj) => IsSupport(obj.GetType().FullName);
        public static bool IsSupport(Type type) => IsSupport(type.FullName);
        public static bool IsSupport<T>() => IsSupport(typeof(T).FullName);
        public static bool IsSupport(string typeName)
        {
            return netReaders.ContainsKey(typeName) || serializableTypes.Any(x => x.FullName == typeName);
        }

        public static bool TryWrite(object obj, out byte[] bytes)
        {
            bytes = null;
            if (IsSupport(obj))
            {
                bytes = WriteAsBytes(obj);
                return true;
            }
            else
            {
                using var ms = new MemoryStream();
                using var writer = new BinaryWriter(ms);
                try
                {
                    writer.Write(obj!.GetType()!.FullName!);
                    var json = JsonHelper.Get(obj);
                    writer.Write(json);
                }
                catch (Exception e)
                {
                    BIT4Log.Log(e);
                    return false;
                }
                
            }
            return true;
            //bytes = null;
            //return false;
        }
    }
}