///////////////////////////////////////////////////////////////////////////////
//
//  Microsoft Research Singularity
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  Note:   Simple ping-pong second child process
//

using Microsoft.SingSharp;
using Microsoft.SingSharp.Runtime;
using Microsoft.Singularity;
using Microsoft.Singularity.Diagnostics.Contracts;
using Microsoft.Singularity.Channels;
using Microsoft.Singularity.Directory;
using Microsoft.Singularity.PingPong.Contracts;
using System;
using System.Diagnostics;

using Microsoft.Singularity.Io;
using Microsoft.Singularity.Configuration;
using Microsoft.SingSharp.Reflection;
using Microsoft.Singularity.Applications;
[assembly: Transform(typeof(WebAppResourceTransform))]

namespace Microsoft.Singularity.PingPong
{
    [Category("PingPong")]
    internal sealed class Parameters
    {
        [Endpoint]
        public readonly TRef<PongContract.Exp:Start> pongRef;

        reflective private Parameters();
        
    }
    
    public class ChildPong
    {
        internal static int AppMain(Parameters! config)
        {
            PongContract.Exp conn = ((!)config.pongRef).Acquire(); 
            if (conn == null) { 
                throw new Exception("ChildPing: Unable to acquire handle to the the Pong Contract"); 
            } 
#if false
            Endpoint * in ExHeap ep = Process.GetStartupEndpoint(0);
            PongContract.Exp conn = ep as PongContract.Exp;
            if (conn == null) {
                // Wrong contract type!
                delete ep;
                return;
            }
#endif 
            conn.SendPongReady();

            try {
                while (true) {
                    switch receive {
                        case conn.Ping(int data):
                            conn.SendPong(data);
                            break;

                        case conn.ChannelClosed():
                            return -1;
                    }
                }
            }
            finally {
                delete conn;
            }
            return 0;
        }
    }
}