using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;

namespace ChatApp
{
    public partial class Form1 : Form
    {
        Socket sck;
        EndPoint epLocal, epRemote;
        byte[] buffer;

        public Form1()
        {
            InitializeComponent();
        }

        private void groupBox2_Enter(object sender, EventArgs e)
        {

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            sck = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

            sck.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);


            textLocalip.Text = GetLocalIP();
            textRemoteIP.Text = GetLocalIP();

        }
        private string GetLocalIP()
        {
            IPHostEntry host;
            host = Dns.GetHostEntry(Dns.GetHostName());
            foreach (IPAddress ip in host.AddressList)
            {
                if (ip.AddressFamily == AddressFamily.InterNetwork)
                    return ip.ToString();
            }

            return "127.0.0.1";

        }

        private void buttonConnect_Click(object sender, EventArgs e)
        {
            epLocal = new IPEndPoint(IPAddress.Parse(textLocalip.Text),Convert.ToInt32(textLocalPort.Text));
            sck.Bind(epLocal);



            epRemote = new IPEndPoint(IPAddress.Parse(textRemoteIP.Text), Convert.ToInt32(textRemotePort.Text));
            sck.Connect(epRemote);


            buffer = new byte[1500];
            sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(MessageCallBack), buffer);

        }

        private void MessageCallBack(IAsyncResult aResult)
        {

            try
            {

                byte[] receivedData = new byte[1500];
                receivedData = (byte[])aResult.AsyncState;



                ASCIIEncoding aEncoding = new ASCIIEncoding();
                string receivedMessage = aEncoding.GetString(receivedData);



                listMessage.Items.Add("Friend: " + receivedMessage);

                buffer = new byte[1500];
                sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(MessageCallBack), buffer);



            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());

            }
        }

        private void buttonSend_Click(object sender, EventArgs e)
        {


            ASCIIEncoding aEncoding = new ASCIIEncoding();
            byte[] sendingMessage = new byte[1500];
            sendingMessage = aEncoding.GetBytes(textMessage.Text);



            sck.Send(sendingMessage);

            listMessage.Items.Add("Me: " + textMessage.Text);
            textMessage.Text = "";

        }

    }
}