' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
 
Imports System.ComponentModel.Composition
Imports System.Diagnostics.CodeAnalysis
Imports System.Threading
Imports Microsoft.CodeAnalysis.Editor.[Shared].Utilities
Imports Microsoft.CodeAnalysis.Editor.VisualBasic.Utilities.CommandHandlers
Imports Microsoft.CodeAnalysis.ImplementAbstractClass
Imports Microsoft.CodeAnalysis.Options
Imports Microsoft.CodeAnalysis.VisualBasic.Syntax
Imports Microsoft.VisualStudio.Commanding
Imports Microsoft.VisualStudio.Language.Intellisense.AsyncCompletion
Imports Microsoft.VisualStudio.Text.Operations
Imports Microsoft.VisualStudio.Utilities
 
Namespace Microsoft.CodeAnalysis.Editor.VisualBasic.ImplementAbstractClass
    <Export(GetType(ICommandHandler))>
    <ContentType(ContentTypeNames.VisualBasicContentType)>
    <Name("ImplementAbstractClassCommandHandler")>
    <Order(Before:=PredefinedCommandHandlerNames.EndConstruct)>
    <Order(After:=PredefinedCompletionNames.CompletionCommandHandler)>
    Friend Class ImplementAbstractClassCommandHandler
        Inherits AbstractImplementAbstractClassOrInterfaceCommandHandler
 
        <ImportingConstructor>
        <SuppressMessage("RoslynDiagnosticsReliability", "RS0033:Importing constructor should be [Obsolete]", Justification:="Used in test code: https://github.com/dotnet/roslyn/issues/42814")>
        Public Sub New(
                threadingContext As IThreadingContext,
                editorOperationsFactoryService As IEditorOperationsFactoryService,
                globalOptions As IGlobalOptionService)
            MyBase.New(threadingContext, editorOperationsFactoryService, globalOptions)
        End Sub
 
        Protected Overrides Async Function TryGetNewDocumentAsync(
            document As Document,
            typeSyntax As TypeSyntax,
            cancellationToken As CancellationToken) As Task(Of Document)
 
            If typeSyntax.Parent.Kind <> SyntaxKind.InheritsStatement Then
                Return Nothing
            End If
 
            Dim classBlock = TryCast(typeSyntax.Parent.Parent, ClassBlockSyntax)
            If classBlock Is Nothing Then
                Return Nothing
            End If
 
            Dim updatedDocument = Await ImplementAbstractClassData.TryImplementAbstractClassAsync(
                document, classBlock, classBlock.ClassStatement.Identifier, cancellationToken).ConfigureAwait(True)
 
            If updatedDocument Is Nothing Then
                Return Nothing
            End If
 
            Dim changes = Await updatedDocument.GetTextChangesAsync(document, cancellationToken).ConfigureAwait(True)
            If changes.Any() Then
                Return updatedDocument
            End If
 
            Return Nothing
        End Function
    End Class
End Namespace