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

namespace jM2
{
    class Client
    {
        public Socket clientSocket;
        public string clientIP;
        private byte[] clientBuffer = new byte[1024];

        /// <summary>
        /// Client constructor
        /// </summary>
        /// <param name="connectionSocket"></param>
        public Client(Socket connectionSocket)
        {
            clientSocket = connectionSocket;
            clientIP = connectionSocket.RemoteEndPoint.ToString();
            clientSocket.BeginReceive(clientBuffer, 0, clientBuffer.Length, SocketFlags.None, new AsyncCallback(dataArrival), null);
        }

        /// <summary>
        /// Close client socket
        /// </summary>
        public void Disconnect()
        {
            try
            {
                Server.freeConnection(this);
                clientSocket.Close();
            }
            catch
            {

            }
        }

        /// <summary>
        /// Data arrived on client socket
        /// </summary>
        /// <param name="iar"></param>
        private void dataArrival(IAsyncResult iar)
        {
            try
            {
                int bytesReceived = clientSocket.EndReceive(iar);

                if (bytesReceived > 0)
                {
                    Console.WriteLine("[" + clientIP + "](" + bytesReceived.ToString() + "): " + BitConverter.ToString(clientBuffer, 0, bytesReceived));
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("[" + ex.HelpLink + "]: " + ex.Message);
                Console.ReadLine();
            }

            clientSocket.BeginReceive(clientBuffer, 0, clientBuffer.Length, SocketFlags.None, new AsyncCallback(dataArrival), null);
        }

        /// <summary>
        /// Send some data to client
        /// </summary>
        /// <param name="data"></param>
        public void Send(byte[] data)
        {
            clientSocket.BeginSend(data, 0, data.Length, SocketFlags.None, new AsyncCallback(dataSent), null);
        }

        /// <summary>
        /// Executed when data has been sent to client
        /// </summary>
        /// <param name="iar"></param>
        private void dataSent(IAsyncResult iar)
        {
            clientSocket.EndSend(iar);
        }

        /// <summary>
        /// Convert string to byte array
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public byte[] stringToByteArray(string str)
        {
            System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
            return encoding.GetBytes(str);
        }
    }
}