using System;
using System.Net.Sockets;
using System.Net;

namespace HDL_ON.DriverLayer
{
	public class UdpSocket
	{
		static UdpSocket _busSocket;
		public static UdpSocket _BusSocket
        {
            get
            {
				if(_busSocket == null)
                {
					_busSocket = new UdpSocket();
                }
				return _busSocket;
            }
        }

		//本地Socket
		private Socket busSocket;
		public int Port = 0;
		/// <summary>
		/// 启动Socket接收和发送功能
		/// </summary>
		public void Start (int port = 0)
        {
			if (IsRunning)
			{
                if (port == Port)
                {
                    return;
                }
                else
                {
                    busSocket.Close();
                }
            }
			if (port != 0)
				Port = port;
			if (Port == 0)
				return;

            busSocket = new Socket (AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            busSocket.EnableBroadcast = true;
            try {
				busSocket.Bind(new IPEndPoint(IPAddress.Any, Port));

				busSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(IPAddress.Parse("239.0.168.188")));
			}
			catch{
                busSocket = null;
                return;
            }

            asyncBeginReceive();

            MainPage.Log ($"udp port : {port}");
        }

		/// <summary>
		/// 停止Socket
		/// </summary>
		public void Stop()
		{
			if (!IsRunning)
			{
				return;
			}
			try
			{
				busSocket.Close();
			}
			catch { }
			busSocket = null;
            MainPage.Log("Socket关闭");
		}

		/// <summary>
		/// 当前的Socket是否运行
		/// </summary>
		public bool IsRunning
		{
			get
			{
				return null == busSocket ? false : true;
			}
		}

		/// <summary>
		/// 开始异步接收数据
		/// </summary>
		private void asyncBeginReceive()
		{
			if (!IsRunning)
			{
				return;
			}

            try {
                Packet packet = new Packet ();
                busSocket.BeginReceiveFrom (packet.Bytes, 0, packet.Bytes.Length, SocketFlags.None, ref packet.RemoteEndPoint, new AsyncCallback (asyncEndReceive), packet);
            } 
            catch (Exception e) {
                System.Threading.Thread.Sleep (1);
                asyncBeginReceive ();
                Console.WriteLine($"asyncBeginReceive {e.Message}");
            } 
		}

		/// <summary>
		/// 异步接收数据结束
		/// </summary>
		/// <param name="iar"></param>
		private void asyncEndReceive(IAsyncResult iar)
		{
			if (!IsRunning)
			{
				return;
			}

			try
			{
				asyncBeginReceive();
				Packet packet = (Packet)iar.AsyncState;
				int len = busSocket.EndReceiveFrom(iar, ref packet.RemoteEndPoint);

				byte[] bytes = packet.Bytes;
				packet.Bytes = new byte[len];
				Array.Copy(bytes, 0, packet.Bytes, 0, packet.Bytes.Length);

				//MainPage.Log($"接收{packet.RemoteEndPoint}数据");
				//mqtt连接数据读取  A协议网络设备信息读取回复 处理
				if (((IPEndPoint)packet.RemoteEndPoint).Port == 8585)
				{
					Control.Ins.ConvertReceiveData(bytes, ((IPEndPoint)packet.RemoteEndPoint).Address.ToString());
				}
				else if(((IPEndPoint)packet.RemoteEndPoint).Port == 6000)//处理bus 6000端口的数据
				{
					packet.Manager();
				}
			}
			catch (Exception ex)
			{
				MainPage.Log($"异步接收数据结束 {ex.Message},{((Packet)iar.AsyncState).Bytes}");
			}
		}

		/// <summary>
		/// 异步发送数据
		/// </summary>
		/// <param name="tempPacket"></param>
		public void AsyncBeginSend(Packet tempPacket)
		{
			try
			{
				if (!IsRunning)
				{
					tempPacket.HaveSendCount++;
					return;
				}
				tempPacket.FlagDateTime = System.DateTime.Now;
				tempPacket.HaveSendCount++;
				busSocket.BeginSendTo(tempPacket.Bytes, 0, tempPacket.Bytes.Length, SocketFlags.None, tempPacket.RemoteEndPoint, new AsyncCallback(asyncEndSend), tempPacket);
			}
			catch (Exception ex)
			{
				MainPage.Log($"AsyncBeginSend error {ex.Message}");
			}
		}

		/// <summary>
		/// 异步发送数据结束
		/// </summary>
		/// <param name="iar"></param>
		private void asyncEndSend(IAsyncResult iar)
		{
			Packet tempUDPPacketBuffer = (Packet)iar.AsyncState;
			try
			{
				int bytesSent = busSocket.EndSendTo(iar);
			}
			catch {
            
            }
		}
	}
}