// 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.Composition;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.ChangeSignature;
using Microsoft.CodeAnalysis.Editor.Shared.Extensions;
using Microsoft.CodeAnalysis.Editor.Shared.Utilities;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.VisualStudio.Text.Classification;
 
namespace Microsoft.VisualStudio.LanguageServices.Implementation.ChangeSignature;
 
[ExportWorkspaceService(typeof(IChangeSignatureOptionsService), ServiceLayer.Host), Shared]
[method: ImportingConstructor]
[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
internal sealed class VisualStudioChangeSignatureOptionsService(
    IClassificationFormatMapService classificationFormatMapService,
    ClassificationTypeMap classificationTypeMap,
    IThreadingContext threadingContext) : IChangeSignatureOptionsService
{
    private readonly IClassificationFormatMap _classificationFormatMap = classificationFormatMapService.GetClassificationFormatMap("tooltip");
    private readonly ClassificationTypeMap _classificationTypeMap = classificationTypeMap;
    private readonly IThreadingContext _threadingContext = threadingContext;
 
    public ChangeSignatureOptionsResult? GetChangeSignatureOptions(
        Document document,
        int positionForTypeBinding,
        ISymbol symbol,
        ParameterConfiguration parameters)
    {
        _threadingContext.ThrowIfNotOnUIThread();
 
        var viewModel = new ChangeSignatureDialogViewModel(
            parameters,
            symbol,
            document,
            positionForTypeBinding,
            _classificationFormatMap,
            _classificationTypeMap);
 
        ChangeSignatureLogger.LogChangeSignatureDialogLaunched();
 
        var dialog = new ChangeSignatureDialog(viewModel);
        var result = dialog.ShowModal();
 
        if (result.HasValue && result.Value)
        {
            ChangeSignatureLogger.LogChangeSignatureDialogCommitted();
 
            var signatureChange = new SignatureChange(parameters, viewModel.GetParameterConfiguration());
            signatureChange.LogTelemetry();
 
            return new ChangeSignatureOptionsResult(signatureChange, previewChanges: viewModel.PreviewChanges);
        }
 
        return null;
    }
}