///////////////////////////////////////////////////////////////////////////////
//
//  Microsoft Research Singularity
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  File:   Delete.sg
//
//  Note:
//

using FileSystem.Utils;
using System;
using System.Text;
using System.Threading;
using Microsoft.Singularity;
using Microsoft.Singularity.Directory;
using Microsoft.Singularity.Channels;
using Microsoft.Singularity.FileSystem;
using Microsoft.Singularity.V1.Services;

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

namespace Microsoft.Singularity.Applications
{
    [ConsoleCategory(HelpMessage="delete named file", DefaultAction=true)]
    internal class Parameters
    {
        [InputEndpoint("data")]
        public readonly TRef<UnicodePipeContract.Exp:READY> Stdin;

        [OutputEndpoint("data")]
        public readonly TRef<UnicodePipeContract.Imp:READY> Stdout;

        [Endpoint]
        public readonly TRef<DirectoryServiceContract.Imp:Start> nsRef;

        [StringParameter( "filename", Mandatory=true, Position=0, HelpMessage="Name of file.")]
        internal string fileName;

        reflective internal Parameters();

        internal int AppMain() {
            return FsDelete.AppMain(this);
        }
    }

    public class FsDelete
    {
        internal static bool DeleteFile(string! fileName, DirectoryServiceContract.Imp! ds)
        {
            ErrorCode error;
            FileUtils.DeleteFile(fileName, ds, out error);
            bool ok = (error == ErrorCode.NoError);
            if (!ok) {
                Console.WriteLine(" File ({0}) delete failed. reason:{1}",
                    fileName, SdsUtils.ErrorCodeToString(error) );
            }
            return ok;
        }

        internal static bool DeleteLink(string! fileName, DirectoryServiceContract.Imp! ds)
        {
            ErrorCode error;
            bool ok = SdsUtils.DeleteLink(fileName, ds, out error);
            if (!ok) {
                Console.WriteLine(" Symbolic Link ({0}) delete failed. reason:{1}",
                    fileName, SdsUtils.ErrorCodeToString(error) );
            }
#if DEBUG
            else {
                DebugStub.Break();
            }
#endif
            return ok;
        }

        internal static bool DeleteDirectory(string! fileName, DirectoryServiceContract.Imp! ds)
        {
            ErrorCode error;
            bool ok = SdsUtils.DeleteDirectory(fileName, ds, out error);
            if (!ok) {
                Console.WriteLine("Delete of directory ({0})  failed. reason:{1}",
                    fileName, SdsUtils.ErrorCodeToString(error) );
            }
            return ok;
        }

        internal static int AppMain(Parameters! config)
        {
            DirectoryServiceContract.Imp ds = (config.nsRef).Acquire();
            if (ds == null) {
                throw new Exception("Unable to acquire handle to the Directory Service root");
            }

            ds.RecvSuccess();

            // see what kind of entity the path points to.
            ErrorCode error;
            NodeType nodeType;
            long size;
            bool ok  = SdsUtils.GetAttributes(config.fileName, ds, out size, out nodeType, out  error);

            if (!ok) {
                Console.WriteLine(" File ({0}) not found. reason:{1}",
                    config.fileName, SdsUtils.ErrorCodeToString(error) );
#if DEBUG
                DebugStub.Break();
#endif
                delete ds;
                return -1;
            }

            bool success = false;
            switch (nodeType) {
                case NodeType.File:
                    success = DeleteFile(config.fileName, ds);
                    break;
                case NodeType.Directory:
                    success = DeleteDirectory(config.fileName, ds);
                    break;
                case NodeType.SymLink:
                    Console.WriteLine("Warning delete link in /fs will hand system");
                    success = DeleteLink(config.fileName, ds);
                    break;
                default:
                    Console.WriteLine(" File ({0}) is of type '({1}). Unable to delete",
                        config.fileName, SdsUtils.NodeTypeToString(nodeType) );
                    success = false;
                    break;
            }

            delete ds;
            return success ? 0 : 1;
        }
    } // class Test
}