///////////////////////////////////////////////////////////////////////////////
//
//  Microsoft Research Singularity
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  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;

namespace Microsoft.Singularity.Applications
{
    public class CPing
    {
        public static int Main(String[]! args)
        {
            int links = 0;
            if (args.Length == 2) {
                links = Int32.Parse(args[1]);
            }
            if (args.Length > 1 && links == 0) {
                Console.WriteLine("Usage:\n" +
                                  "    ping [links]\n" +
                                  "Summary\n" +
                                  "    Starts one cpong process and 'links' clink processes.");
                return 1;
            }

            // Start up the pong process.
            PongContract.Imp! pongImp;
            PongContract.Exp! pongExp;

            PongContract.NewChannel(out pongImp, out pongExp);

            Console.WriteLine("CPing  : Starting cpong.");

            string[] cargs = new string[1];
            cargs[0] = "CPong";
            Process child = new Process(cargs, null, 1);
            child.SetStartupEndpoint(0, (Endpoint * in ExHeap)pongExp);
            child.Start();

            // Start up each link process.
            for (int i = 0; i < links; i++) {
                PongContract.Imp! linkImp;
                PongContract.Exp! linkExp;

                PongContract.NewChannel(out linkImp, out linkExp);

                Console.WriteLine("CPing  : Starting clink[{0}].", i);
                cargs = new string[2];
                cargs[0] = "CLink";
                cargs[1] = i.ToString();

                child = new Process(cargs, null, 2);
                child.SetStartupEndpoint(0, (Endpoint * in ExHeap)linkExp);
                child.SetStartupEndpoint(1, (Endpoint * in ExHeap)pongImp);
                child.Start();

                pongImp = linkImp;
            }

            Console.WriteLine("CPing  : Waiting for cpong.");
            pongImp.RecvPongReady();

            try {
                for (int i = 1; i <= 5; ++i) {
                    int data = i * 1000;
                    Console.WriteLine("CPing  : Ping({0}).", data);
                    pongImp.SendPing(data);
                    pongImp.RecvPong(out data);
                    Console.WriteLine("CPing  : Pong({0}).", data);
                }
                Console.WriteLine("CPing  : Finished.");
                return 0;
            }
            finally {
                delete pongImp;
            }
            return 1;
        }
    }
}