// 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.Collections.Immutable;
using System.Composition;
using System.Diagnostics.CodeAnalysis;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.Shared.Extensions;
 
namespace Microsoft.CodeAnalysis.CSharp.UseIndexOrRangeOperator;
 
using System.Linq;
using static CodeFixHelpers;
 
[ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.UseIndexOperator), Shared]
[method: ImportingConstructor]
[method: SuppressMessage("RoslynDiagnosticsReliability", "RS0033:Importing constructor should be [Obsolete]", Justification = "Used in test code: https://github.com/dotnet/roslyn/issues/42814")]
internal sealed class CSharpUseIndexOperatorCodeFixProvider() : SyntaxEditorBasedCodeFixProvider
{
    public override ImmutableArray<string> FixableDiagnosticIds { get; } =
        [IDEDiagnosticIds.UseIndexOperatorDiagnosticId];
 
    public override Task RegisterCodeFixesAsync(CodeFixContext context)
    {
        RegisterCodeFix(context, CSharpAnalyzersResources.Use_index_operator, nameof(CSharpAnalyzersResources.Use_index_operator));
        return Task.CompletedTask;
    }
 
    protected override Task FixAllAsync(
        Document document, ImmutableArray<Diagnostic> diagnostics,
        SyntaxEditor editor, CancellationToken cancellationToken)
    {
        // Process diagnostics from innermost to outermost in case any are nested.
        foreach (var diagnostic in diagnostics.OrderByDescending(d => d.Location.SourceSpan.Start))
        {
            var node = diagnostic.Location.FindNode(getInnermostNodeForTie: true, cancellationToken);
 
            editor.ReplaceNode(
                node,
                (currentNode, _) => IndexExpression(((BinaryExpressionSyntax)currentNode).Right));
        }
 
        return Task.CompletedTask;
    }
}