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

namespace StuMgmClient
{
    class Comm
    {
        #region 基本函数
        const int bufSize = 1024 * 1024;
        static IPEndPoint m_ipEndpoint;
        static Socket m_socket;
        static byte[] m_buf;
        
        void Init(string ip,int port)
        {
            IPAddress ipAdress = IPAddress.Parse(ip);
            m_ipEndpoint = new IPEndPoint(ipAdress, port);
            m_buf = new byte[bufSize];
        }
        void Connect()
        {
            try
            {
                m_socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                m_socket.Connect(m_ipEndpoint);
            }
            catch (Exception ex)
            {
                Debug.Print(ex.Message);
            }
        }
        bool Send(byte[] data)
        {
            try
            {
                m_socket.Send(data);
                return true;
            }
            catch(Exception e)
            {
                Debug.Print(e.Message);
                return false;
            }
        }
        bool Receive()
        {
            try
            {
                Array.Clear(m_buf, 0, m_buf.Length);
                m_socket.Receive(m_buf);
                return true;
            }
            catch (Exception e)
            {
                Debug.Print(e.Message);
                return false;
            }
        }
        void DisConnect()
        {
            client.Close();
        }
        #endregion

        internal ErrCode VerifLogin(string userName,string pawssword,out Roles role)
        {
            role = Roles.Error;
            Connect();
            UserInfo cs = new UserInfo(userName,pawssword);
            byte[] sendBuf;
            if(Utility.BinSerialize(cs,out sendBuf ))
                return ErrCode.FailSerial;
            if (Send(sendBuf))
                return ErrCode.FailSend;
            if (Receive())
                return ErrCode.FailReceive;
            object o;
            if (Utility.BinDeserialize(m_buf, out o))
                return ErrCode.FailDeserial;
            if (!(o is UserInfo))
                return ErrCode.ErrData;
            DisConnect();
            role = ((UserInfo)o).UserRole;
            return ErrCode.Success;
        }







        

    }
}