using System;
using System.Threading.Tasks;
using Cysharp.Threading.Tasks;
using DotNetty.Buffers;
using DotNetty.Transport.Bootstrapping;
using DotNetty.Transport.Channels;
using DotNetty.Transport.Channels.Sockets;
using DotRecast.Core.Collections;
using Google.Protobuf;
using JNGame.Network.Netty.TCP;
using Plugins.JNGame.Network;
using Plugins.JNGame.Network.Entity;
using UnityEngine;

namespace JNGame.Network
{
    public class JNTCPServer : JNServerBase
    {

        private int _port = 0;
        public int Port => _port;

        private ServerBootstrap bootstrap;
        private IEventLoopGroup bossGroup;
        private IEventLoopGroup workerGroup;
        private IChannel channel;

        private TcpServerInitializer server;
        
        public override async Task OnInit()
        {

            bossGroup = new MultithreadEventLoopGroup(1);
            workerGroup = new MultithreadEventLoopGroup(4);
            bootstrap = new ServerBootstrap();
            bootstrap.Group(bossGroup, workerGroup);
            bootstrap.Channel<TcpServerSocketChannel>();
            bootstrap
                .Option(ChannelOption.SoBacklog, 1024)
                //ByteBuf的分配器(重用缓冲区)大小
                .Option(ChannelOption.Allocator, UnpooledByteBufferAllocator.Default)
                .Option(ChannelOption.RcvbufAllocator, new FixedRecvByteBufAllocator(1024 * 8))
                .ChildOption(ChannelOption.SoKeepalive, true) //保持长连接
                .ChildOption(ChannelOption.TcpNodelay, true) //端口复用
                .ChildOption(ChannelOption.SoReuseport, true)
                //自定义初始化Tcp服务
                .ChildHandler(server = new TcpServerInitializer(this));

            await StartBind();
            
        }


        protected async Task StartBind()
        {
            try
            {
                channel = await bootstrap.BindAsync(_port = await GetPort());
                Debug.Log($"[JNTCPServer] 服务器创建成功");
            }
            catch (Exception e)
            {            
                Debug.LogWarning(e.Message);
                Debug.Log($"[JNTCPServer] 服务器创建失败 1s后重试");
                await UniTask.DelayFrame(1000);
                await StartBind();
            }
        }

        protected virtual async UniTask<int> GetPort()
        {
            await UniTask.NextFrame();
            return 9001;
        }

        public override void OnClose()
        {
            base.OnClose();
            CloseNetty();
            Debug.Log($"[JNTCPServer] 关闭连接");
            
        }

        private async Task CloseNetty()
        {
            channel?.CloseAsync();
            bossGroup?.ShutdownGracefullyAsync();
            workerGroup?.ShutdownGracefullyAsync();
            channel = null;
            bossGroup = null;
            workerGroup = null;
        }
        
        public void AllSend(int hId,IMessage data = null)
        {
            server.GetClients().ForEach(id => Send(id,hId,data));
        }
        
        public void Send(int client,int hId,IMessage data = null)
        {
            IChannelHandlerContext context = server.GetClient(client);
            context.WriteAsync(JNetParam.Build(this._id++, hId).SetData(data));
        }
    }
}