// 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.
 
using System;
using System.Collections.Immutable;
using System.Composition;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.UseExplicitTupleName
{
    [ExportCodeFixProvider(LanguageNames.CSharp, LanguageNames.VisualBasic, Name = PredefinedCodeFixProviderNames.UseExplicitTupleName), Shared]
    internal partial class UseExplicitTupleNameCodeFixProvider : SyntaxEditorBasedCodeFixProvider
    {
        [ImportingConstructor]
        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
        public UseExplicitTupleNameCodeFixProvider()
        {
        }
 
        public override ImmutableArray<string> FixableDiagnosticIds { get; }
            = ImmutableArray.Create(IDEDiagnosticIds.UseExplicitTupleNameDiagnosticId);
 
        public override Task RegisterCodeFixesAsync(CodeFixContext context)
        {
            RegisterCodeFix(context, AnalyzersResources.Use_explicitly_provided_tuple_name, nameof(AnalyzersResources.Use_explicitly_provided_tuple_name));
            return Task.CompletedTask;
        }
 
        protected override Task FixAllAsync(
            Document document, ImmutableArray<Diagnostic> diagnostics,
            SyntaxEditor editor, CodeActionOptionsProvider fallbackOptions, CancellationToken cancellationToken)
        {
            var generator = editor.Generator;
 
            foreach (var diagnostic in diagnostics)
            {
                var oldNameNode = diagnostic.Location.FindNode(
                    getInnermostNodeForTie: true, cancellationToken: cancellationToken);
 
                var preferredName = diagnostic.Properties[nameof(UseExplicitTupleNameDiagnosticAnalyzer.ElementName)];
                Contract.ThrowIfNull(preferredName);
 
                var newNameNode = generator.IdentifierName(preferredName).WithTriviaFrom(oldNameNode);
 
                editor.ReplaceNode(oldNameNode, newNameNode);
            }
 
            return Task.CompletedTask;
        }
    }
}