///////////////////////////////////////////////////////////////////////////////
//
//  Microsoft Research Singularity
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  File:   RamDisk\Control\Utilities.sg
//
//  Note:
//

using System;

using Microsoft.SingSharp;
using Microsoft.SingSharp.Reflection;

using Microsoft.Singularity.Applications;
using Microsoft.Singularity.Channels;
using Microsoft.Singularity.Configuration;
using Microsoft.Singularity.Directory;
using Microsoft.Singularity.Io;

using Microsoft.Singularity.Services.RamDisk.Contracts;

namespace Microsoft.Singularity.Services.RamDisk.RamDiskControl
{
    internal class Utilities
    {
        internal static RamDiskControlContract.Imp ConnectToManager()
        {
            DirectoryServiceContract.Imp! rootds = DirectoryService.NewClientEndpoint();

            try {
                RamDiskControlContract.Imp! service_imp;
                RamDiskControlContract.Exp! service_exp;
                RamDiskControlContract.NewChannel(out service_imp, out service_exp);
                
                ErrorCode error;
                if (!SdsUtils.Bind(RamDiskControlContract.ManagerControlPath, rootds, service_exp, out error)) {
                    Console.WriteLine("Failed to connect to service path '{0}'.  Error: {1}",
                        RamDiskControlContract.ManagerControlPath,
                        SdsUtils.ErrorCodeToString(error));
                    delete service_imp;
                    return null;
                }
                
                service_imp.RecvSuccess();
                return service_imp;
            }
            finally {
                delete rootds;
            }
        }

        internal static void DisplayError(RamDiskContractErrorCode e)
        {
            string message = "unknown";
            switch (e) {
                case RamDiskContractErrorCode.NoError:
                    message = "no error";
                    break;
                case RamDiskContractErrorCode.AccessDenied:
                    message = "directory access denied";
                    break;
                case RamDiskContractErrorCode.CapacityReached:
                    message = "capacity of directory resources reached";
                    break;
                case RamDiskContractErrorCode.InsufficientResources:
                    message = "insufficient resources";
                    break;
                case RamDiskContractErrorCode.DirectoryFull:
                case RamDiskContractErrorCode.IsOpen:
                    message = "disk in use";
                    break;
                case RamDiskContractErrorCode.DoesNotExist:
                    message = "device does not exist";
                    break;
                case RamDiskContractErrorCode.OutOfMemory:
                    message = "out of memory";
                    break;
                case RamDiskContractErrorCode.IsInUse:
                    message = "disk is still in use - use -f to force destroy";
                    break;
                case RamDiskContractErrorCode.InternalError:
                    message = "internal error";
                    break;
            }
            Console.WriteLine("Failed: {0}.", message);
        }

        internal static void DisplayChannelClosedError()
        {
            Console.WriteLine(
                "Failed: Channel to RAM disk client manager closed unexpectedly."
                );
        }
    }
}