// 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.Composition;
using Microsoft.CodeAnalysis.Editor.Shared;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.VisualStudio.Text;
using Microsoft.VisualStudio.InteractiveWindow;
using Microsoft.CodeAnalysis.Shared;
using System;
 
namespace Microsoft.CodeAnalysis.Interactive;
 
internal sealed class InteractiveSupportsFeatureService
{
    [ExportWorkspaceService(typeof(ITextBufferSupportsFeatureService), [WorkspaceKind.Interactive]), Shared]
    internal sealed class InteractiveTextBufferSupportsFeatureService : ITextBufferSupportsFeatureService
    {
        [ImportingConstructor]
        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
        public InteractiveTextBufferSupportsFeatureService()
        {
        }
 
        private static bool IsActiveLanguageBuffer(ITextBuffer textBuffer)
        {
            var evaluator = (IInteractiveEvaluator)textBuffer.Properties[typeof(IInteractiveEvaluator)];
            var window = evaluator?.CurrentWindow;
            if (window?.CurrentLanguageBuffer == textBuffer)
            {
                // These are only correct if we're on the UI thread.
                // Otherwise, they're guesses and they might change immediately even if they're correct.
                // If we return true and the buffer later becomes readonly, it appears that the 
                // the code fix simply has no effect.
                return !window.IsResetting && !window.IsRunning;
            }
 
            return false;
        }
 
        public bool SupportsCodeFixes(ITextBuffer textBuffer)
            => IsActiveLanguageBuffer(textBuffer);
 
        public bool SupportsRefactorings(ITextBuffer textBuffer)
            => false;
 
        public bool SupportsRename(ITextBuffer textBuffer)
            => false;
 
        public bool SupportsNavigationToAnyPosition(ITextBuffer textBuffer)
            => true;
    }
 
    [ExportWorkspaceService(typeof(IDocumentSupportsFeatureService), [WorkspaceKind.Interactive]), Shared]
    internal sealed class InteractiveDocumentSupportsFeatureService : IDocumentSupportsFeatureService
    {
        [ImportingConstructor]
        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
        public InteractiveDocumentSupportsFeatureService()
        {
        }
 
        public bool SupportsCodeFixes(Document document)
        {
            // TODO: Implement this.
            return false;
        }
 
        public bool SupportsRefactorings(Document document)
            => false;
 
        public bool SupportsRename(Document document)
            => false;
 
        public bool SupportsNavigationToAnyPosition(Document document)
            => true;
 
        public bool SupportsSemanticSnippets(Document document)
            => false;
    }
}