using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;

namespace SKMC.Api.Common.Tcp
{
    public class TcpClientBase
    {
        protected static readonly ILogger log = LogFactory.Get();

        public string Address { get; set; } = "127.0.0.1";

        public int Port { get; set; }

        public int TIMEOUT { get; set; } = 5000;

        // 是否长连接
        public bool KeepAlived { get; set; } = false;

        // 测试模式(空跑模式)下, 不等待接收响应
        public bool TestMode { get; set; } = false;

        // 是否开启
        public bool Enabled { get; set; } = true;

        public bool Logged { get; set; } = true;

        // 是否运行中, 结束运行可放弃等待服务端响应数据
        public bool Running { get; set; }

        private TCPClient client;


        public TcpClientBase(string address, int port)
        {
            Address = address;
            Port = port;
            client = new TCPClient(Address, Port) { KeepAlived = KeepAlived };
        }

        /// <summary>
        /// 保持连接, 如果连接已中断则重新连接
        /// </summary>
        /// <param name="mills">验证连接的超时时间(ms)</param>
        /// <returns></returns>
        public TCPClient Connect(int mills)
        {
            if (!Enabled) return null;
            if (!KeepAlived || !client.IsConnected(mills))
            {
                client.Connect();
            }
            return client;
        }

        public TCPClient Connect()
        {
            if (!Enabled) return null;
            if (client != null) client.Connect();
            return client;
        }

        public void Reset(int index)
        {
            if (client != null) client.Clear();
            Running = false;
        }

        /// <summary>
        /// 请求并获取结果
        /// 请求后阻塞获取确认消息
        /// 再异步接收结果
        /// </summary>
        /// <param name="requestMsg">请求消息</param>
        /// <param name="responseAction">响应结果解析</param>
        /// <returns></returns>
        public Task RequestAndResult(string requestMsg, bool sync = false, Action<string> responseAction = null, Action<string> resultAction = null)
        {
            string response = null;
            string result = null;
            try
            {
                client = Connect(100);
                Reset(0);

                client.Send(requestMsg, Logged);
                response = client.Recevie(Logged);

                if (sync)
                {
                    resultAction?.Invoke(response);
                    if (!KeepAlived) client.Close();
                }
                else
                {
                    // 异步模式, 视觉采图响应
                    try
                    {
                        responseAction?.Invoke(response);
                    }
                    catch (Exception e)
                    {
                        throw new Exception($"Response Parse(Aync) Error", e);
                    }
                }

                if (sync) return null;

                return Task.Run(() =>
                {
                    try
                    {
                        result = client.Recevie(Logged);
                        resultAction?.Invoke(result);
                        if (!KeepAlived) client.Close();
                    }
                    catch (Exception e)
                    {
                        throw new Exception($"Result Parse(Aync) Error", e);
                    }
                });
            }
            catch (SocketException ex)
            {
                switch ((SocketError)ex.ErrorCode)
                {
                    case SocketError.TimedOut:
                        throw new Exception($"接收超时: [{Address} : {Port}]", ex);

                    case SocketError.ConnectionRefused:
                        throw new Exception($"连接被拒绝: [{Address} : {Port}]", ex);

                    case SocketError.HostNotFound:
                        throw new Exception($"地址未找到: [{Address} : {Port}]", ex);

                    case SocketError.NetworkDown:
                        throw new Exception($"网络不可用: [{Address} : {Port}]", ex);

                    case SocketError.AddressAlreadyInUse:
                        throw new Exception($"地址已被使用: [{Address} : {Port}]", ex);

                    default:
                        throw new Exception($"其他Socket异常: [{Address} : {Port}]", ex);
                }
            }
            catch (Exception e)
            {
                throw e;
            }
        }
    }
}