// 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.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using Microsoft.VisualStudio.Text;
using Microsoft.VisualStudio.Text.Editor;
using Microsoft.VisualStudio.Text.Projection;
 
namespace Roslyn.Hosting.Diagnostics.VenusMargin;
 
public partial class ProjectionBufferMargin : UserControl
{
    public static event EventHandler SelectionChanged;
 
    public IWpfTextView TextView { get; set; }
    public ITextEditorFactoryService TextEditorFactory { get; set; }
 
    public ProjectionBufferMargin()
    {
        InitializeComponent();
    }
 
    private void ListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        TextView.Properties[ProjectionSpanTaggerProvider.PropertyName] = new List<Span>(e.AddedItems.Cast<SnapshotSpan>().Select(ss => ss.Span).Where(ss => !ss.IsEmpty));
        RaiseSelectionChanged(EventArgs.Empty);
    }
 
    private void RaiseSelectionChanged(EventArgs args)
    {
        SelectionChanged?.Invoke(this, args);
    }
 
    private void Button_Click(object sender, RoutedEventArgs e)
    {
        var buffer = (ITextBuffer)((FrameworkElement)sender).Tag;
 
        var view = TextEditorFactory.CreateTextView(buffer);
 
        var projectionBuffer = TextView.TextBuffer as IProjectionBuffer;
        var spansFromBuffer = from ss in projectionBuffer.CurrentSnapshot.GetSourceSpans()
                              where ss.Snapshot.TextBuffer == buffer
                              select ss.Span;
 
        view.Properties[ProjectionSpanTaggerProvider.PropertyName] = new List<Span>(spansFromBuffer);
        var host = TextEditorFactory.CreateTextViewHost(view, setFocus: true);
 
        var window = new Window
        {
            Content = host.HostControl,
            ShowActivated = true,
        };
 
        window.Closed += (s, a) =>
        {
            host.Close();
        };
 
        window.Show();
    }
}