///////////////////////////////////////////////////////////////////////////////
//
//  Microsoft Research Singularity
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  File:   Kernel/Singularity.ServiceManager/ServiceManager.sg
//
//  Note:
//
using System;
using System.Collections;
using System.Threading;
using Microsoft.Singularity.Io;
using Microsoft.Singularity.Directory;
using Microsoft.Singularity.Loader;
using Microsoft.Singularity.Xml;
using Microsoft.Singularity.Channels;

namespace Microsoft.Singularity.ServiceManager
{
    public class ServiceManagerModule
    {
        private const string Name = "sms";
        private const string Executable = "sms";

        private static void StartProcess(string! executable, String[]! args)
        {
            Process process = null;
            Manifest manifest = null;

            IoMemory memory = Binder.LoadImage(Thread.CurrentProcess,
                                               executable,
                                               out manifest);

            if (memory != null && memory.Length > 0 && manifest != null) {
                DirectoryServiceContract.Imp! ds = DirectoryService.NewClientEndpoint();
                if (ds == null) { 
                    DebugStub.Break(); 
                } 
                
                process = new Process(Thread.CurrentProcess,
                                      memory,
                                      null,
                                      args,
                                      manifest);
                if (process != null) {
                    process.SetEndpoint(0, ds); 
                    DebugStub.WriteLine("Starting SMS");
                    process.Start();
                }
            }
            else {
                DebugStub.WriteLine("Unable to find {0}",
                                    __arglist(executable));
                DebugStub.Break();
            }
        }

        public static void Initialize(XmlNode !config)
        {
            ArrayList args = new ArrayList();

            args.Add(Name);

            if (config != null) {
                foreach (XmlNode! service in config.Children) {
                    if (service.Name != "service") {
                        continue;
                    }

                    string name = service.GetAttribute("name", "");
                    string binary = service.GetAttribute("binary", "");
                    string option = service.GetAttribute("mode", "managed");
                    args.Add(name);
                    args.Add(binary);
                    args.Add(option);

                    DebugStub.Print("SMS: Found " + name +
                                    "(" + binary + ": " + option + ")\n");
                }
            }
            else {
                DebugStub.WriteLine("SMS:No Configuration");
            }

            StartProcess(Executable, (String[]!)args.ToArray(typeof(string)));
        }
    }
}