// 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;
 
namespace Microsoft.CodeAnalysis.RemoveUnnecessarySuppressions
{
    [ExportCodeFixProvider(LanguageNames.CSharp, LanguageNames.VisualBasic, Name = PredefinedCodeFixProviderNames.RemoveUnnecessaryAttributeSuppressions), Shared]
    internal sealed class RemoveUnnecessaryAttributeSuppressionsCodeFixProvider : SyntaxEditorBasedCodeFixProvider
    {
        [ImportingConstructor]
        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
        public RemoveUnnecessaryAttributeSuppressionsCodeFixProvider()
        {
        }
 
        public override ImmutableArray<string> FixableDiagnosticIds
            => ImmutableArray.Create(IDEDiagnosticIds.InvalidSuppressMessageAttributeDiagnosticId);
 
        public override async Task RegisterCodeFixesAsync(CodeFixContext context)
        {
            var root = await context.Document.GetRequiredSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);
            foreach (var diagnostic in context.Diagnostics)
            {
                // Register code fix with a defensive check
                if (root.FindNode(diagnostic.Location.SourceSpan) != null)
                {
                    RegisterCodeFix(context, AnalyzersResources.Remove_unnecessary_suppression, nameof(AnalyzersResources.Remove_unnecessary_suppression));
                }
            }
        }
 
        protected override Task FixAllAsync(Document document, ImmutableArray<Diagnostic> diagnostics, SyntaxEditor editor, CodeActionOptionsProvider fallbackOptions, CancellationToken cancellationToken)
        {
            foreach (var diagnostic in diagnostics)
            {
                var node = editor.OriginalRoot.FindNode(diagnostic.Location.SourceSpan);
                editor.RemoveNode(node);
            }
 
            return Task.CompletedTask;
        }
    }
}