using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 using System.Windows.Forms;

 using SharpDisplay;

 using System.ServiceModel;

 using System.ServiceModel.Channels;

 namespace SharpDisplayClient

 {

     /// <summary>

     ///

     /// </summary>

     [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple)]

     public class Callback : ICallback, IDisposable

     {

         private MainForm MainForm { get; set; }

         public Callback(MainForm aMainForm)

         {

             MainForm = aMainForm;

         }

         public void OnConnected()

         {

             //Debug.Assert(Thread.CurrentThread.IsThreadPoolThread);

             //Trace.WriteLine("Callback thread = " + Thread.CurrentThread.ManagedThreadId);

             MessageBox.Show("OnConnected()", "Client");

         }

         public void OnCloseOrder()

         {

             //Debug.Assert(Thread.CurrentThread.IsThreadPoolThread);

             //Trace.WriteLine("Callback thread = " + Thread.CurrentThread.ManagedThreadId);

             //MessageBox.Show("OnServerClosing()", "Client");

             MainForm.CloseConnectionThreadSafe();

             MainForm.CloseThreadSafe();

         }

         //From IDisposable

         public void Dispose()

         {

         }

     }

     /// <summary>

     ///

     /// </summary>

     [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple)]

     public class Client : DuplexClientBase<IService>

     {

         public string SessionId { get { return InnerChannel.SessionId; } }

         public Client(ICallback aCallback)

             : base(new InstanceContext(aCallback), new NetTcpBinding(SecurityMode.None, true), new EndpointAddress("net.tcp://localhost:8001/DisplayService"))

         { }

         public void SetName(string aClientName)

         {

             Channel.SetName(aClientName);

         }

         public void SetLayout(TableLayout aLayout)

         {

             Channel.SetLayout(aLayout);

         }

         public void SetField(DataField aField)

         {

             Channel.SetField(aField);

         }

         public void SetFields(System.Collections.Generic.IList<DataField> aFields)

         {

             Channel.SetFields(aFields);

         }

         public int ClientCount()

         {

             return Channel.ClientCount();

         }

         public bool IsReady()

         {

             return State == CommunicationState.Opened || State == CommunicationState.Created;

         }

     }

     /// <summary>

     /// Handle connection with our Sharp Display Server.

     /// If the connection is faulted it will attempt to restart it.

     /// </summary>

     public class DisplayClient

     {

         private Client iClient;

         private Callback iCallback;

         private bool resetingConnection = false;

         private MainForm MainForm { get; set; }

         public string SessionId { get { return iClient.SessionId; } }

         public string Name { get; private set; }

         private TableLayout Layout { get; set; }

         private System.Collections.Generic.IList<DataField> Fields { get; set; }

         public DisplayClient(MainForm aMainForm)

         {

             MainForm = aMainForm;

             Name = "";

             Fields = new DataField[]{};

         }

         /// <summary>

         /// Initialize our server connection.

         /// </summary>

         public void Open()

         {

             iCallback = new Callback(MainForm);

             iClient = new Client(iCallback);

         }

         /// <summary>

         /// Terminate our server connection.

         /// </summary>

         public void Close()

         {

             iClient.Close();

             iClient = null;

             iCallback.Dispose();

             iCallback = null;

         }

         /// <summary>

         /// Tells whether a server connection is available.

         /// </summary>

         /// <returns>True if a server connection is available. False otherwise.</returns>

         public bool IsReady()

         {

             return (iClient != null && iCallback != null && iClient.IsReady());

         }

         /// <summary>

         /// Check if our server connection is available and attempt reset it if it isn't.

         /// This is notably dealing with timed out connections.

         /// </summary>

         public void CheckConnection()

         {

             if (!IsReady() && !resetingConnection)

             {

                 //Try to reconnect

                 Open();

                 //Avoid stack overflow in case of persisting failure

                 resetingConnection = true;

                 try

                 {

                     //On reconnect there is a bunch of properties we need to reset

                     if (Name != "")

                     {

                         iClient.SetName(Name);

                     }

                     SetLayout(Layout);

                     SetFields(Fields);

                 }

                 finally

                 {

                     //Make sure our this state does not get out of sync

                     resetingConnection = true;

                 }

             }

         }

         public void SetName(string aClientName)

         {

             Name = aClientName;

             CheckConnection();

             iClient.SetName(aClientName);

         }

         public void SetLayout(TableLayout aLayout)

         {

             Layout = aLayout;

             CheckConnection();

             iClient.SetLayout(aLayout);

         }

         public void SetField(DataField aField)

         {

             //TODO: Create fields if not present

             int i = 0;

             foreach (DataField field in Fields)

             {

                 if (field.Index == aField.Index)

                 {

                     //Update our field then

                     Fields[i] = aField;

                     break;

                 }

                 i++;

             }

             CheckConnection();

             iClient.SetField(aField);

         }

         public void SetFields(System.Collections.Generic.IList<DataField> aFields)

         {

             Fields = aFields;

             CheckConnection();

             iClient.SetFields(aFields);

         }

         public int ClientCount()

         {

             CheckConnection();

             return iClient.ClientCount();

         }

     }

 }