using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Runtime;
using System.Text;
using System.Threading.Tasks;
using WatsonTcp;

namespace TcpEventBus
{
    public class WatsonTcpServer : ISocket
    {
        public readonly static string SYNC = ("SyncMsg");
        public string IP { get; }
        public int Port { get; }
        Guid guid = Guid.Empty;
        public WatsonTcpServer(string ip,int port,int timeout = 5000)
        {
            IP = ip;
            Port = port;
            IsConnect = false;
            ReceiveTimeout = timeout;
            server = new WatsonTcp.WatsonTcpServer(ip,port);
            server.Events.MessageReceived += (sender, args) =>
            {
                if (args.Metadata != null && args.Metadata.TryGetValue(nameof(SYNC), out var val) && string.Equals(val.ToString(), SYNC)) return;
                OnData?.Invoke(args.Data);
            };
            server.Events.ClientConnected += (sender, args) =>
            {
                guid = args.Client.Guid;
                OnConnected?.Invoke();
                IsConnect = true;
            };
            server.Events.ClientDisconnected += (sender, args) =>
            {
                guid = Guid.Empty;
                OnDisconnected?.Invoke();
                IsConnect = false;
            };
            server.Settings.NoDelay = true;
            server.Settings.IdleClientTimeoutSeconds = 5;
            server.Keepalive.EnableTcpKeepAlives = true;
            server.Keepalive.TcpKeepAliveTime = 1;
            server.Keepalive.TcpKeepAliveInterval = 1;
            server.Keepalive.TcpKeepAliveRetryCount = 3;
        }
        private WatsonTcp.WatsonTcpServer server;
        public int ReceiveTimeout { get; private set; }
        [AllowNull]
        public Action OnConnected { get; set; }
        [AllowNull]
        public Action<ArraySegment<byte>> OnData { get; set; }
        [AllowNull]
        public Action OnDisconnected { get; set; }

        public bool IsConnect { get; private set; }

        public bool IsService => true;

        public void Disconnect()
        {
            server?.Stop();
            IsConnect = false;
        }

        public void Send(byte[] data)
        {
            if (server == null || guid == Guid.Empty) return;
            try
            {
                server.SendAsync(guid, data).Wait();
            }
            catch
            {

            }
        }

        public void Start()
        {
            if (server == null) return;
            if (server.IsListening) return;
            server.Start();
        }
    }



    public class WatsonTcpClient : ISocket
    {
        public string IP { get; }
        public int Port { get; }
        [AllowNull]
        private CancellationTokenSource tokenSource;
        public WatsonTcpClient(string ip, int port, int timeout = 5000)
        {
            IP = ip;
            Port = port;
            IsConnect = false;
            ReceiveTimeout = timeout;
            client = new WatsonTcp.WatsonTcpClient(ip, port);
            client.Events.MessageReceived += (sender, args) =>
            {
                OnData?.Invoke(args.Data);
            };
            client.Events.ServerConnected += (sender, args) =>
            {
                OnConnected?.Invoke();
                IsConnect = true;
            };
            client.Events.ServerDisconnected += (sender, args) =>
            {
                OnDisconnected?.Invoke();
                IsConnect = false;
            };
            client.Settings.NoDelay = true;
            client.Keepalive.EnableTcpKeepAlives = true;
            client.Keepalive.TcpKeepAliveTime = 1;
            client.Keepalive.TcpKeepAliveInterval = 1;
            client.Keepalive.TcpKeepAliveRetryCount = 3;
            v[nameof(WatsonTcpServer.SYNC)] = WatsonTcpServer.SYNC;
        }
        private WatsonTcp.WatsonTcpClient client;
        public int ReceiveTimeout { get; private set; }
        [AllowNull]
        public Action OnConnected { get; set; }
        [AllowNull]
        public Action<ArraySegment<byte>> OnData { get; set; }
        [AllowNull]
        public Action OnDisconnected { get; set; }

        public bool IsConnect { get; private set; }

        public bool IsService => true;
        Dictionary<string, object> v = new Dictionary<string, object>();
        public void Disconnect()
        {
            tokenSource?.Cancel();
            client?.Disconnect();
            IsConnect = false;
        }

        public void Send(byte[] data)
        {
            if (client == null || !client.Connected) return;
            client.SendAsync(data).Wait();
        }
        private void SendSync()
        {
            if (client == null || !client.Connected) return;
            client.SendAsync([], v).Wait();
        }

        public void Start()
        {
            if (client == null) return;
            if (client.Connected) return;
            client.Connect();
            tokenSource = new CancellationTokenSource();
            Task.Run(async () =>
            {
                while (!tokenSource.IsCancellationRequested)
                {
                    SendSync();
                    await Task.Delay(1000);
                }
            },tokenSource.Token);
        }
    }
}