// 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 System.Windows.Media;
using Microsoft.CodeAnalysis.Editor.Implementation.Structure;
using Microsoft.CodeAnalysis.Editor.Shared.Extensions;
using Microsoft.CodeAnalysis.Editor.Shared.Utilities;
using Microsoft.CodeAnalysis.Editor.Tagging;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Options;
using Microsoft.VisualStudio.Text;
using Microsoft.VisualStudio.Text.Editor;
using Microsoft.VisualStudio.Text.Projection;
using Microsoft.VisualStudio.Text.Tagging;
using Microsoft.VisualStudio.Utilities;
using StructureTag = Microsoft.CodeAnalysis.Editor.Implementation.Structure.StructureTag;
 
namespace Microsoft.CodeAnalysis.Editor.Structure;
 
[Export(typeof(ITaggerProvider))]
[Export(typeof(AbstractStructureTaggerProvider))]
[TagType(typeof(IStructureTag))]
[ContentType(ContentTypeNames.RoslynContentType)]
[method: ImportingConstructor]
[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
internal sealed class StructureTaggerProvider(
    TaggerHost taggerHost,
    EditorOptionsService editorOptionsService,
    IProjectionBufferFactoryService projectionBufferFactoryService,
    ITextEditorFactoryService textEditorFactoryService) : AbstractStructureTaggerProvider(taggerHost, editorOptionsService, projectionBufferFactoryService)
{
    private readonly ITextEditorFactoryService _textEditorFactoryService = textEditorFactoryService;
 
    internal override object? GetCollapsedHintForm(StructureTag structureTag)
    {
        return new ViewHostingControl(CreateElisionBufferView, () => CreateElisionBufferForTagTooltip(structureTag));
    }
 
    private IWpfTextView CreateElisionBufferView(ITextBuffer finalBuffer)
        => CreateShrunkenTextView(ThreadingContext, _textEditorFactoryService, finalBuffer);
 
    private static IWpfTextView CreateShrunkenTextView(
        IThreadingContext threadingContext,
        ITextEditorFactoryService textEditorFactoryService,
        ITextBuffer finalBuffer)
    {
        var roles = textEditorFactoryService.CreateTextViewRoleSet(OutliningRegionTextViewRole);
        var view = textEditorFactoryService.CreateTextView(finalBuffer, roles);
 
        view.Background = Brushes.Transparent;
 
        view.SizeToFit(threadingContext);
 
        // Zoom out a bit to shrink the text.
        view.ZoomLevel *= 0.75;
 
        return view;
    }
 
    private const string OutliningRegionTextViewRole = nameof(OutliningRegionTextViewRole);
}