// 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.
 
#nullable disable
 
using System;
using System.Collections.Immutable;
using System.Composition;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.CSharp.UseInterpolatedVerbatimString
{
    /// <summary>
    /// Converts a verbatim interpolated string @$"" to an interpolated verbatim string $@""
    /// </summary>
    [ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.UseInterpolatedVerbatimString), Shared]
    internal partial class CSharpUseInterpolatedVerbatimStringCodeFixProvider : SyntaxEditorBasedCodeFixProvider
    {
        [ImportingConstructor]
        [SuppressMessage("RoslynDiagnosticsReliability", "RS0033:Importing constructor should be [Obsolete]", Justification = "Used in test code: https://github.com/dotnet/roslyn/issues/42814")]
        public CSharpUseInterpolatedVerbatimStringCodeFixProvider()
        {
        }
 
        public override ImmutableArray<string> FixableDiagnosticIds
            => ImmutableArray.Create("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, CodeActionOptionsProvider fallbackOptions, 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);
        }
    }
}