///////////////////////////////////////////////////////////////////////////////
//
//  Microsoft Research Singularity
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  File:   ChildPing.sg
//
//  Note:   Simple ping-pong test child app #1
//

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<PingContract.Exp:Start> pingRef;

        reflective private Parameters();
        
    }

    public class ChildPing
    {
        internal  static int AppMain(Parameters! config)
        {
            PingContract.Exp conn = ((!)config.pingRef).Acquire(); 
            if (conn == null) { 
                throw new Exception("ChildPing: Unable to acquire handle to the the Ping Contract"); 
            } 
            
#if false 
            Endpoint * in ExHeap ep = Process.GetStartupEndpoint(0);
            PingContract.Exp conn = ep as PingContract.Exp;
            if (conn == null) {
                // Wrong contract type!
                delete ep;
                return;
            }
#endif
            // Start up and connect to the ChildPong image!
            PongContract.Imp! childImp;
            PongContract.Exp! childExp;
            PongContract.NewChannel(out childImp, out childExp);

            string[] args = new string[1];
            args[0] = "ChildPong.x86";
            Process child = new Process(args, (Endpoint * in ExHeap)childExp);
            child.Start();

            childImp.RecvPongReady();
            conn.SendPingReady();

            try {
                while (true) {
                    switch receive {
                        case conn.StartPingPong(int numReps) :
                            for (int i = 0; i < numReps; ++i) {
                                int data;
                                childImp.SendPing(42);
                                childImp.RecvPong(out data);
                            }

                            conn.SendDone();
                            break;

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