Imports DigitalData.Modules.Database
Imports DigitalData.Modules.Logging
Imports DigitalData.Modules.Language
Imports DigitalData.Modules
Imports System.IO
Imports System.ServiceModel
Imports System.Data.SqlClient
Imports System.ServiceModel.Description
Imports DigitalData.Services.EDMIService.Messages
Imports DigitalData.Modules.EDMI.API.Rights
Imports DigitalData.Services.EDMIService.Exceptions


<ServiceBehavior(InstanceContextMode:=InstanceContextMode.PerSession)>
Public Class EDMIService
    Implements IEDMIService

    Public Shared LogConfig As LogConfig
    Public Shared MSSQL_ECM As MSSQLServer
    Public Shared MSSQL_IDB As MSSQLServer
    Public Shared Firebird As Firebird
    Public Shared AppConfig As Config
    Public Shared Filesystem As Filesystem.File
    Public Shared EDMIArchive As EDMI.File.Archive
    Public Shared GlobalState As GlobalState
    Public Shared Scheduler As Scheduler

    Public Const TBIDB_DOC_INFO = "TBIDB_DOC_INFO"
    Public Const TBIDB_ACCESSRIGHT = "TBIDB_ACCESSRIGHT"

    Private ReadOnly _Logger As Logger
    Private ReadOnly _Debug As Boolean = False
    Private ReadOnly _Username As String

    Public Shared Sub Configure(Config As ServiceConfiguration)
        Dim oBaseAddress = Config.BaseAddresses.Item(0)
        Dim oBinding = EDMI.API.Channel.GetBinding()
        Dim oAddress = New EndpointAddress(oBaseAddress)
        ' See: https://stackoverflow.com/questions/42327988/addserviceendpoint-throws-key-is-null
        Dim oDescription = ContractDescription.GetContract(GetType(IEDMIService), GetType(EDMIService))
        Dim oEndpoint As New ServiceEndpoint(oDescription, oBinding, oAddress)

        Config.AddServiceEndpoint(oEndpoint)
        Config.Description.Behaviors.Add(New ServiceDebugBehavior With {.IncludeExceptionDetailInFaults = True})
    End Sub

    Public Sub New()
        Dim oOperationContext As OperationContext = OperationContext.Current
        Dim oInstanceContext As InstanceContext = oOperationContext.InstanceContext
        Dim oUsername = StripDomainFromUsername(oOperationContext.ServiceSecurityContext.WindowsIdentity.Name)

        _Username = oUsername
        _Logger = LogConfig.GetLogger()
        _Logger.Debug("New Request by User [{0}]", _Username)
    End Sub

    Private Function StripDomainFromUsername(UserName As String)
        If UserName.Contains("\") Then
            Return UserName.Split("\")(1)
        ElseIf UserName.Contains("@") Then
            Return UserName.Split("@")(0)
        Else
            Return UserName
        End If
    End Function

#Region "=== Heartbeat ==="
    Public Function Heartbeat() As Boolean Implements IEDMIService.Heartbeat
        Return True
    End Function
#End Region

#Region "=== Database ==="
    Public Function ReturnDatatableFromCache(Name As String, FilterExpression As String, SortByColumn As String) As TableResult Implements IEDMIService.ReturnDatatableFromCache
        Try
            _Logger.Debug($"ReturnDatatableFromCache: Datatable: {Name}")

            Dim oDataset As DataSet = GlobalState.TableStore
            Dim oDataTable As DataTable = Nothing

            _Logger.Debug("ReturnDatatableFromCache: DataSet contains [{0}] datatables", oDataset.Tables.Count)

            If oDataset.Tables.Contains(Name) Then
                oDataTable = oDataset.Tables.Item(Name).Copy()

                ' Apply filter and sorting to data
                Dim oFilterExpression As String = Utils.NotNull(FilterExpression, String.Empty)
                Dim oSortByColumn As String = Utils.NotNull(SortByColumn, String.Empty)

                Dim oFilteredRows = oDataTable.Select(oFilterExpression, oSortByColumn)
                Dim oFilteredTable As DataTable = Nothing

                If oFilteredRows.Count > 0 Then
                    oFilteredTable = oFilteredRows.CopyToDataTable()
                    oFilteredTable.TableName = Name
                Else
                    ' Produce empty table
                    oFilteredTable = oDataTable.Clone()
                    oFilteredTable.TableName = Name
                End If

                _Logger.Debug("ReturnDatatableFromCache: Datatable Stats for [{0}]:", Name)
                _Logger.Debug("Unfiltered: [{0}] rows", oDataTable.Rows.Count)
                _Logger.Debug("Filtered: [{0}] rows", oFilteredTable.Rows.Count)

                Return New TableResult(oFilteredTable)
            Else
                _Logger.Warn($"ReturnDatatableFromCache: Datatable {Name} does not exist")
                Throw GetFault($"ReturnDatatableFromCache: Datatable {Name} does not exist")
            End If

        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function
#End Region

#Region "=== Database (MSSQL IDB) ==="
    Public Function ReturnDatatable_MSSQL_IDB(SQL As String) As TableResult Implements IEDMIService.ReturnDatatable_MSSQL_IDB
        Try
            _Logger.Info($"ReturnDatatable_MSSQL_IDB, SQL: {SQL}")
            Dim oResult As DataTable = MSSQL_IDB.GetDatatable(SQL)
            oResult.TableName = "DD_RESULT"
            Return New TableResult(oResult)

        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function

    Public Function ReturnScalar_MSSQL_IDB(SQL As String) As ScalarResult Implements IEDMIService.ReturnScalar_MSSQL_IDB
        Try
            _Logger.Info($"ReturnScalar_MSSQL_IDB, SQL: {SQL}")
            Dim oResult As Object = MSSQL_IDB.GetScalarValue(SQL)
            Return New ScalarResult(oResult)

        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function

    Public Function ExecuteNonQuery_MSSQL_IDB(SQL As String) As NonQueryResult Implements IEDMIService.ExecuteNonQuery_MSSQL_IDB
        Try
            _Logger.Info($"ExecuteNonQuery_MSSQL_IDB, SQL: {SQL}")
            Dim oResult As Boolean = MSSQL_IDB.ExecuteNonQuery(SQL)
            Return New NonQueryResult()

        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function
#End Region

#Region "=== Database (MSSQL ECM) ==="
    Public Function ReturnDatatable_MSSQL_ECM(SQL As String) As TableResult Implements IEDMIService.ReturnDatatable_MSSQL_ECM
        Try
            _Logger.Info($"ReturnDatatable_MSSQL_ECM, SQL: {SQL}")
            Dim oResult As DataTable = MSSQL_ECM.GetDatatable(SQL)
            oResult.TableName = "DD_RESULT"
            Return New TableResult(oResult)

        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function

    Public Function ReturnScalar_MSSQL_ECM(SQL As String) As ScalarResult Implements IEDMIService.ReturnScalar_MSSQL_ECM
        Try
            _Logger.Info($"ReturnScalar_MSSQL_ECM, SQL: {SQL}")
            Dim oResult As Object = MSSQL_ECM.GetScalarValue(SQL)
            Return New ScalarResult(oResult)

        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function

    Public Function ExecuteNonQuery_MSSQL_ECM(SQL As String) As NonQueryResult Implements IEDMIService.ExecuteNonQuery_MSSQL_ECM
        Try
            _Logger.Info($"ExecuteNonQuery_MSSQL_ECM, SQL: {SQL}")
            Dim oResult As Boolean = MSSQL_ECM.ExecuteNonQuery(SQL)
            Return New NonQueryResult()

        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function
#End Region

#Region "=== Database (Firebird) ==="
    Public Function ReturnDatatable_Firebird(SQL As String) As TableResult Implements IEDMIService.ReturnDatatable_Firebird
        Try
            _Logger.Info($"ReturnDatatable, SQL: {SQL}")
            Dim oResult As DataTable = Firebird.GetDatatable(SQL)
            oResult.TableName = "DD_RESULT"
            Return New TableResult(oResult)

        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function

    Public Function ReturnScalar_Firebird(SQL As String) As ScalarResult Implements IEDMIService.ReturnScalar_Firebird
        Try
            _Logger.Info($"ReturnScalar, SQL: {SQL}")
            Dim oResult As Object = Firebird.GetScalarValue(SQL)
            Return New ScalarResult(oResult)

        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function

    Public Function ExecuteNonQuery_Firebird(SQL As String) As NonQueryResult Implements IEDMIService.ExecuteNonQuery_Firebird
        Try
            _Logger.Info($"ExecuteNonQuery, SQL: {SQL}")
            Dim oResult As Boolean = Firebird.ExecuteNonQuery(SQL)
            Return New NonQueryResult()

        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function
#End Region

#Region "=== Document ==="
    ''' <summary>
    ''' Imports a file according to ObjectStoreId
    ''' </summary>
    ''' <returns></returns>
    Public Function ImportFile(Data As DocumentImportRequest) As DocumentImportResponse Implements IEDMIService.ImportFile
        Dim oObjectStore = GlobalState.ObjectStores.First()
        Dim EDMIPath = New EDMI.File.Path(LogConfig, oObjectStore.Path)

        ' TODO: 
        ' - Get Object Store -> Object Catalog -> Catalog Path
        ' - If IS_ARCHIVE = True And RetentionDays <> Nothing:
        '   DoArchive!
        ' - Refactor EDMIPath to get ObjectStore at service start up
        '   and return ObjectStore Path from ObjectStoreId + RelativePath
        ' VWIDB_OBJECTSTORE

        Dim oRelativePath As String = EDMIPath.GetRelativePath(Data.DocumentType, Data.FileName)
        Dim oAbsolutePath As String = EDMIPath.GetFullPath(Data.DocumentType, Data.FileName)
        Dim oDirectoryPath = EDMIPath.GetFullPath(Data.DocumentType)

        Try
            Directory.CreateDirectory(oDirectoryPath)

            Dim oVersionedFileName As String = Filesystem.GetVersionedFilename(oAbsolutePath)

            _Logger.Info("ImportFile: Saving file [{0}] to path [{1}]", Data.FileName, oVersionedFileName)
            Using oStream = New FileStream(oVersionedFileName, FileMode.CreateNew)
                oStream.Write(Data.Contents, 0, Data.Contents.Length)
                oStream.Flush(True)
                oStream.Close()
            End Using

            ' insert into db
            Dim oCommand As New SqlCommand("PRIDB_NEW_DOCUMENT")
            oCommand.Parameters.AddWithValue("@OBJ_ST_ID", 1)
            oCommand.Parameters.AddWithValue("@REL_PATH", oRelativePath)
            oCommand.Parameters.AddWithValue("@WHO", _Username)
            oCommand.Parameters.AddWithValue("@REF_DOCID", 0)
            oCommand.Parameters.Add(New SqlParameter("@IDB_OBJ_ID", SqlDbType.BigInt))

            Dim oObjectId = MSSQL_IDB.GetScalarValue(oCommand, "@IDB_OBJ_ID")

            Return New DocumentImportResponse() With {.ObjectId = oObjectId}

        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function

    Public Function GetFileByObjectId(Data As DocumentStreamRequest) As DocumentStreamResponse Implements IEDMIService.GetFileByObjectId
        Try
            Dim oFullPath = GetFullPathForObjectId(Data.ObjectId)

            If oFullPath = String.Empty Then
                Dim oDetails As New ObjectDoesNotExistFault(Data.ObjectId)
                _Logger.Warn("GetFileByObjectId: " & oDetails.ErrorMessage)
                Throw New FaultException(Of ObjectDoesNotExistFault)(oDetails, oDetails.ErrorMessage)
            End If

            _Logger.Debug("GetFileByObjectId: Loading file [{0}]", oFullPath)

            Dim oFileInfo As New FileInfo(oFullPath)

            If Not oFileInfo.Exists Then
                Dim oDetails As New ObjectDoesNotExistFault(Data.ObjectId)
                _Logger.Warn("GetFileByObjectId: " & oDetails.ErrorMessage)
                Throw New FaultException(Of ObjectDoesNotExistFault)(oDetails, oDetails.ErrorMessage)
            End If

            Dim oDestination As New MemoryStream()
            Using oSource As FileStream = IO.File.OpenRead(oFullPath)
                oSource.CopyTo(oDestination)
            End Using
            oDestination.Seek(0, SeekOrigin.Begin)

            Dim oMessage As New DocumentStreamResponse() With {
                .FileName = oFileInfo.Name,
                .FileContents = oDestination
            }

            Return oMessage

        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function

    Public Function GetFileInfoByObjectId(Data As DocumentInfoRequest) As DocumentInfoResponse Implements IEDMIService.GetFileInfoByObjectId
        Try
            Dim oAccessRight = GetAccessRightForObjectId(Data.UserId, Data.ObjectId)
            Dim oFullPath = GetFullPathForObjectId(Data.ObjectId)

            If oFullPath = String.Empty Then
                Dim oFault As New ObjectDoesNotExistFault(Data.ObjectId)
                Throw New FaultException(Of ObjectDoesNotExistFault)(oFault, oFault.ErrorMessage)
            End If

            Return New DocumentInfoResponse With {
                .FileRight = oAccessRight,
                .FullPath = oFullPath
            }

        Catch ex As FaultException
            _Logger.Warn("GetFileInfoByObjectId: " & ex.Message)
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Warn("GetFileInfoByObjectId: " & ex.Message)
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function

    Public Function ListFilesForUser() As DocumentListResponse Implements IEDMIService.ListFilesForUser
        Try
            Dim oDatatable = GetFileList()

            Return New DocumentListResponse() With {
                .Datatable = oDatatable
            }

        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function

    Public Function GetFileList() As DataTable
        Try
            If Not GlobalState.TableStore.Tables.Contains(TBIDB_DOC_INFO) Then
                _Logger.Warn("GetFileList: Document info table does not exist!")
                Return Nothing
            End If

            Dim oTable As DataTable = GlobalState.TableStore.Tables.Item(TBIDB_DOC_INFO)
            Return oTable
        Catch ex As Exception
            _Logger.Warn("GetFileList: Unexpected Error while getting file list.")
            _Logger.Error(ex)
            Return Nothing
        End Try
    End Function
    Private Function GetFullPathForObjectId(ObjectId As Long) As String
        Try
            If Not GlobalState.TableStore.Tables.Contains(TBIDB_DOC_INFO) Then
                _Logger.Warn("GetFullPathForObjectId: Document info table does not exist!")
                Return String.Empty
            End If

            Dim oTable As DataTable = GlobalState.TableStore.Tables.Item(TBIDB_DOC_INFO)
            Dim oRows As List(Of DataRow) = oTable.Select($"IDB_OBJ_ID = {ObjectId}").ToList()

            Dim oFullPath As String

            If oRows.Count = 0 Then
                _Logger.Warn("GetFullPathForObjectId: Full path does not exist for object [{0}]", ObjectId)
                oFullPath = String.Empty
            Else
                Dim oRow As DataRow = oRows.First()
                oFullPath = oRow.Item("FULL_PATH")
            End If

            Return oFullPath
        Catch ex As Exception
            _Logger.Warn("GetFullPathForObjectId: Unexpected Error while getting full path for object [{0}].", ObjectId)
            _Logger.Error(ex)
            Return String.Empty
        End Try
    End Function
    Private Function GetAccessRightForObjectId(UserId As Long, ObjectId As Long) As AccessRight
        Try
            If Not GlobalState.TableStore.Tables.Contains(TBIDB_ACCESSRIGHT) Then
                _Logger.Warn("GetAccessRightForObjectId: Access right table does not exist!")
                Return AccessRight.VIEW_ONLY
            End If

            Dim oTable As DataTable = GlobalState.TableStore.Tables.Item(TBIDB_ACCESSRIGHT)
            Dim oRows As List(Of DataRow) = oTable.Select($"IDB_OBJ_ID = {ObjectId} AND USR_ID = {UserId}").ToList()
            Dim oRight As AccessRight

            If oRows.Count = 0 Then
                _Logger.Warn("GetAccessRightForObjectId: Access right assignment does not exist for user [{0}] on object [{1}]", UserId, ObjectId)
                Return AccessRight.VIEW_ONLY
            Else
                If oRows.Count > 1 Then
                    _Logger.Warn("GetAccessRightForObjectId: More than one access right assignment found for user [{0}] on object [{1}]", UserId, ObjectId)
                End If

                Dim oRow As DataRow = oRows.First()
                Dim oRightAsInt = oRow.Item("ACCESSRIGHT")

                oRight = Utils.ToEnum(Of AccessRight)(oRightAsInt)
            End If

            Return oRight
        Catch ex As Exception
            _Logger.Warn("GetAccessRightForObjectId: Unexpected Error while getting access right for object [{0}].", ObjectId)
            _Logger.Error(ex)
            Return AccessRight.VIEW_ONLY
        End Try
    End Function

    Public Function NewObjectId(Data As NewObjectIdRequest) As NewObjectIdResponse Implements IEDMIService.NewObjectId
        Try
            Dim oSQL As String = $"DECLARE @NEW_IDB_OBJ_ID BIGINT
                EXEC PRIDB_NEW_OBJECT '{Data.KindType}','{Data.Who}','{Data.BusinessEntity}',0, @IDB_OBJ_ID = @NEW_IDB_OBJ_ID OUTPUT;
                SELECT @NEW_IDB_OBJ_ID"
            Dim oObjectId = MSSQL_IDB.GetScalarValue(oSQL)

            If oObjectId Is Nothing Then
                Throw GetFault("NewObjectId: Could not create new ObjectId!")
            End If

            Return New NewObjectIdResponse With {.ObjectId = oObjectId}
        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function

    Public Function NewFileObject(Data As NewFileObjectRequest) As NewFileObjectResponse Implements IEDMIService.NewFileObject
        Try
            Dim oStoreType As String = Data.StoreType

            _Logger.Debug("DataStore type is [{0}]", oStoreType)

            If oStoreType = String.Empty Then
                _Logger.Debug("DataStore empty, set to [{0}]", ClassConstants.FileStoreWork)
                oStoreType = ClassConstants.FileStoreWork
            End If

            Dim oRelpath As String = GetFileStorePraefix(oStoreType)
            Dim oSubDirectory As String

            If IsNothing(Data.DateImported) Then
                oSubDirectory = GetDateSubDirectory(Now)
            Else
                oSubDirectory = GetDateSubDirectory(Data.DateImported)
            End If

            _Logger.Debug("Subdirectory is [{0}]", oSubDirectory)

            oRelpath = Path.Combine(oRelpath, oSubDirectory)

            If Not Directory.Exists(oRelpath) Then
                Try
                    _Logger.Debug("Path does not exist, creating: [{0}]", oRelpath)
                    Directory.CreateDirectory(oRelpath)
                    _Logger.Debug("Created folder [{0}]", oRelpath)
                Catch ex As Exception
                    Throw GetFault(ex)
                End Try
            End If

            _Logger.Debug("Relative Path is [{0}]", oRelpath)

            Dim oFileObjectPath As String = Path.Combine(oRelpath, GetFileObjectFileName(Data.ObjectId, Data.Extension, Data.KeepExtension))
            _Logger.Debug("Final Path is [{0}]", oFileObjectPath)

            Return New NewFileObjectResponse With {.FileObjectPath = oFileObjectPath}
        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function

    Public Function ImportFileIntoFileObject(Data As ImportFileIntoFileObjectRequest) As ImportFileIntoFileObjectResponse Implements IEDMIService.ImportFileIntoFileObject
        Try
            Dim oObjectStore = GlobalState.ObjectStores.
                Where(Function(o) o.Title = Data.ObjectStoreType).
                FirstOrDefault()

            If oObjectStore Is Nothing Then
                Throw New KeyNotFoundException($"ObjectStore [{Data.ObjectStoreType}] was not found.")
            End If

            Using oStream = New FileStream(Data.FilePath, FileMode.Create, FileAccess.Write)
                _Logger.Info("ImportFile: Saving file to path [{0}]", Data.FilePath)
                _Logger.Info("ImportFile: Content Length: {0}", Data.Contents.Length)

                oStream.Write(Data.Contents, 0, Data.Contents.Length)
                oStream.Flush(True)
                oStream.Close()
            End Using

            ' insert into db
            Dim oSQL As String = $"EXEC PRIDB_NEW_IDBFO '{Data.FilePath}','{Data.Who}','{Data.ObjectId}',{oObjectStore.Id}"
            Dim oResult As Boolean = MSSQL_IDB.ExecuteNonQuery(oSQL)

            Return New ImportFileIntoFileObjectResponse() With {.Result = oResult}

        Catch ex As FaultException
            _Logger.Error(ex)
            Throw ex

        Catch ex As Exception
            _Logger.Error(ex)
            Throw GetFault(ex)

        End Try
    End Function
#End Region

    Private Function GetFileObjectFileName(IDB_OBJ_ID As Long, pExtension As String, pKeepExtension As Boolean) As String
        If Not pExtension.StartsWith("."c) Then
            pExtension &= "."c
        End If

        If pKeepExtension Then
            Return $"{IDB_OBJ_ID}{pExtension}"
        Else
            Return $"{IDB_OBJ_ID}.ddfo"
        End If
    End Function

    Private Function GetFileStorePraefix(pStoreType As String) As String
        Dim oObjectStore

        If pStoreType = ClassConstants.FileStoreArchive Then
            oObjectStore = GlobalState.ObjectStores.Item(0)
        Else ' pStoreType = ClassConstants.FileStoreWork Then
            oObjectStore = GlobalState.ObjectStores.Item(1)
        End If

        _Logger.Debug($"oObjectStore is [{oObjectStore.Path}]")
        Return oObjectStore.Path
    End Function

    Private Function GetDateSubDirectory(pDate As Date) As String
        Return Path.Combine(pDate.ToString("yyyy"), pDate.ToString("MM"), pDate.ToString("dd"))
    End Function

    Private Function GetFault(Exception As Exception) As FaultException
        Dim oFault As New UnexpectedErrorFault(Exception)
        Return New FaultException(Of UnexpectedErrorFault)(oFault, New FaultReason(oFault.InnerException.Message))
    End Function

    Private Function GetFault(ErrorMessage As String) As FaultException
        Dim oFault As New UnexpectedErrorFault(New ApplicationException(ErrorMessage))
        Return New FaultException(Of UnexpectedErrorFault)(oFault, New FaultReason(oFault.InnerException.Message))
    End Function

End Class