// 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.ComponentModel.Composition;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.VisualStudio.Commanding;
using Microsoft.VisualStudio.Text.Editor.Commanding.Commands;
using Microsoft.VisualStudio.Text.Outlining;
using Microsoft.VisualStudio.Utilities;
 
namespace Microsoft.CodeAnalysis.Editor.Implementation.Structure;
 
[Export(typeof(ICommandHandler))]
[ContentType(ContentTypeNames.RoslynContentType)]
[Name("Outlining Command Handler")]
[method: ImportingConstructor]
[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
internal sealed class OutliningCommandHandler(IOutliningManagerService outliningManagerService) : ICommandHandler<StartAutomaticOutliningCommandArgs>
{
    private readonly IOutliningManagerService _outliningManagerService = outliningManagerService;
 
    public string DisplayName => EditorFeaturesResources.Outlining;
 
    public bool ExecuteCommand(StartAutomaticOutliningCommandArgs args, CommandExecutionContext context)
    {
        // The editor actually handles this command, we just have to make sure it is enabled.
        return false;
    }
 
    public CommandState GetCommandState(StartAutomaticOutliningCommandArgs args)
    {
        var outliningManager = _outliningManagerService.GetOutliningManager(args.TextView);
        var enabled = false;
        if (outliningManager != null)
        {
            enabled = outliningManager.Enabled;
        }
 
        return new CommandState(isAvailable: !enabled);
    }
}