// 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.Editing;
using Microsoft.CodeAnalysis.Shared.Extensions;
 
namespace Microsoft.CodeAnalysis.CSharp.UseInterpolatedVerbatimString;
 
/// <summary>
/// Converts a verbatim interpolated string @$"" to an interpolated verbatim string $@""
/// </summary>
[ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.UseInterpolatedVerbatimString), 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 partial class CSharpUseInterpolatedVerbatimStringCodeFixProvider() : SyntaxEditorBasedCodeFixProvider
{
    public override ImmutableArray<string> FixableDiagnosticIds => ["CS8401"];
 
    private const string InterpolatedVerbatimText = "$@\"";
 
    public override Task RegisterCodeFixesAsync(CodeFixContext context)
    {
        RegisterCodeFix(context, CSharpCodeFixesResources.Use_interpolated_verbatim_string, nameof(CSharpCodeFixesResources.Use_interpolated_verbatim_string));
        return Task.CompletedTask;
    }
 
    protected override Task FixAllAsync(
        Document document, ImmutableArray<Diagnostic> diagnostics,
        SyntaxEditor editor, CancellationToken cancellationToken)
    {
        foreach (var diagnostic in diagnostics)
        {
            cancellationToken.ThrowIfCancellationRequested();
            AddEdits(editor, diagnostic, cancellationToken);
        }
 
        return Task.CompletedTask;
    }
 
    private static void AddEdits(
        SyntaxEditor editor,
        Diagnostic diagnostic,
        CancellationToken cancellationToken)
    {
        var verbatimInterpolatedLocation = diagnostic.Location;
        var verbatimInterpolated = (InterpolatedStringExpressionSyntax)verbatimInterpolatedLocation.FindNode(getInnermostNodeForTie: true, cancellationToken);
 
        var oldStartToken = verbatimInterpolated.StringStartToken;
        var newStartToken = SyntaxFactory.Token(oldStartToken.LeadingTrivia, SyntaxKind.InterpolatedVerbatimStringStartToken,
            InterpolatedVerbatimText, InterpolatedVerbatimText, oldStartToken.TrailingTrivia);
 
        var interpolatedVerbatim = verbatimInterpolated.WithStringStartToken(newStartToken);
 
        editor.ReplaceNode(verbatimInterpolated, interpolatedVerbatim);
    }
}