using AKSWebBrowser.Commen;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Net;
using System.Net.Http;
using System.IO.Ports;
using System.Timers;
using AksWebBrowser;

namespace AksWebBrowser.Common
{
    public class TcpClients
    {
        public string jsonstr = string.Empty;
        /// <summary>
        /// 打开连接
        /// </summary>
        public TcpClients()
        {
            try
            {
                //初始化连接 192.168.1.166
                Parame.tcpClient = new TcpClient(Parame.Ip, 1234);
                NetworkStream stream = Parame.tcpClient.GetStream();
                Task.Factory.StartNew(() => { Write(stream); });
                ThreadPool.QueueUserWorkItem(SendInstruction, Parame.tcpClient);
            }
            catch { Parame.tcpClient = null; }
            finally
            {
                //开启定时
                System.Timers.Timer timer = new System.Timers.Timer(1000);//3秒钟的时间间隔
                timer.Elapsed += OnTimedEvent;
                timer.AutoReset = true;//重复执行
                timer.Enabled = true;//启动定时器
            }
        }


        //打开串口
        private void OnTimedEvent(Object source, ElapsedEventArgs e)
        {
            try
            {
                if (Parame.tcpClient == null)
                {
                    Parame.tcpClient = new TcpClient(Parame.Ip, 1234);
                    NetworkStream stream = Parame.tcpClient.GetStream();
                    Task.Factory.StartNew(() => { Write(stream); });
                    ThreadPool.QueueUserWorkItem(SendInstruction, Parame.tcpClient);
                }
            }
            catch { Parame.tcpClient = null; }
            finally { }
        }

        /// <summary>
        /// 读取服务端信息
        /// </summary>
        /// <param name="stream"></param>
        public void Write(NetworkStream stream)
        {
            while (true)
            {
                try
                {
                    // 读取包头，获取消息的大小
                    int messageSize = ReadHeader(stream);
                    if (messageSize == -1)
                    {
                        Parame.tcpClient = null;
                        //Console.WriteLine("与服务端连接断开");
                        break;
                    }
                    // 读取消息内容
                    byte[] buffer = new byte[messageSize];

                    int bytesRead = ReadExactly(stream, buffer, 0, messageSize);

                    if (bytesRead < messageSize)
                    {
                        Parame.tcpClient = null;
                        //Console.WriteLine("无法读取消息，可能是连接断开");
                        break;
                    }
                    string message = Encoding.UTF8.GetString(buffer, 0, bytesRead);
                    if (!message.Contains("heartbeatService"))
                    {
                        //接收到服务端口返回数据
                        //Console.WriteLine("接收到服务端口返回数据：{0}", message);
                        jsonstr = message;
                    }
                    else
                    {
                        //收到服务器心跳反馈
                        //Console.WriteLine("收到服务器心跳反馈：{0}", message);
                        SendDataWithHeader(stream, "heartbeatClient");
                    }
                }
                catch { jsonstr = string.Empty; Parame.tcpClient = null; }
                finally { }
            }
        }

        /// <summary>
        /// 发送信息给服务端
        /// </summary>
        /// <param name="stream"></param>
        /// <param name="message"></param>
        public string SendDataWithHeader(NetworkStream stream, string message)
        {
            try
            {
                int timeout = 0;
                byte[] messageBytes = Encoding.UTF8.GetBytes(message);
                byte[] header = BitConverter.GetBytes(messageBytes.Length);
                byte[] data = new byte[header.Length + messageBytes.Length];
                Array.Copy(header, 0, data, 0, header.Length);
                Array.Copy(messageBytes, 0, data, header.Length, messageBytes.Length);
                stream.Write(data, 0, data.Length);
                jsonstr = string.Empty;
                while (string.IsNullOrEmpty(jsonstr) && Parame.tcpClient != null)
                {
                    Task.Delay(10).Wait();
                    timeout = timeout + 10;
                    if (timeout > 9000)
                    {
                        jsonstr = MainModel.str2Base64("{\"message\":\"fali\",\"code\":\"400\",\"status\":false,\"data\":\"" + "获取数据超时！" + "\"}");
                    }
                }
                if (string.IsNullOrEmpty(jsonstr))
                {
                    jsonstr = MainModel.str2Base64("{\"message\":\"fali\",\"code\":\"400\",\"status\":false,\"data\":\"" + "硬件服务器未启动" + "\"}");
                }
            }
            catch { Parame.tcpClient = null; }
            finally { }
            return jsonstr;
        }

        /// <summary>
        /// 发送心跳
        /// </summary>
        /// <param name="state"></param>
        public void SendInstruction(object state)
        {
            try
            {
                TcpClient client = (TcpClient)state;
                NetworkStream stream = client.GetStream();
                while (true)
                {
                    // 每隔2分钟向服务端发送一条指令
                    Thread.Sleep(122000);
                    SendDataWithHeader(stream, "keepAlive");
                    //Console.WriteLine("发送心跳指令关闭连接");
                }
            }
            catch { Parame.tcpClient = null; }
            finally { }
        }

        /// <summary>
        /// 解析包头中有多少字节
        /// </summary>
        /// <param name="stream"></param>
        /// <returns></returns>
        public int ReadHeader(NetworkStream stream)
        {
            try
            {
                byte[] header = new byte[4];
                int headerBytesRead = stream.Read(header, 0, 4);

                if (headerBytesRead < 4)
                {
                    Parame.tcpClient = null;
                    //Console.WriteLine("无法读取包头，可能是连接断开");
                    return -1;
                }
                return BitConverter.ToInt32(header, 0);
            }
            catch
            {
                Parame.tcpClient = null;
                return -1;
            }
        }

        /// <summary>
        /// 等待流全部获取到,然后丢出去
        /// </summary>
        /// <param name="stream"></param>
        /// <param name="buffer"></param>
        /// <param name="offset"></param>
        /// <param name="count"></param>
        /// <returns></returns>
        public int ReadExactly(NetworkStream stream, byte[] buffer, int offset, int count)
        {
            try
            {
                int bytesRead = 0;
                while (bytesRead < count)
                {
                    int result = stream.Read(buffer, offset + bytesRead, count - bytesRead);
                    if (result == 0)
                    {
                        // 连接断开或遇到流的末尾
                        return bytesRead;
                    }
                    bytesRead += result;
                }
                return bytesRead;
            }
            catch
            {
                Parame.tcpClient = null;
                return -1;
            }
        }
    }
}