// 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 Markdig.Syntax;

namespace CommunityToolkit.Labs.WinUI.MarkdownTextBlock.TextElements;

internal class MyCodeBlock : IAddChild
{
    private CodeBlock _codeBlock;
    private Paragraph _paragraph;
    private MarkdownConfig _config;

    public TextElement TextElement
    {
        get => _paragraph;
    }

    public MyCodeBlock(CodeBlock codeBlock, MarkdownConfig config)
    {
        _codeBlock = codeBlock;
        _config = config;
        _paragraph = new Paragraph();
        var container = new InlineUIContainer();
        var border = new Border();
        border.Background = (Brush)Application.Current.Resources["ExpanderHeaderBackground"];
        border.Padding = _config.Themes.Padding;
        border.Margin = _config.Themes.InternalMargin;
        border.CornerRadius = _config.Themes.CornerRadius;
        var richTextBlock = new RichTextBlock();

        if (codeBlock is FencedCodeBlock fencedCodeBlock)
        {
//#if !WINAPPSDK
//            var formatter = new ColorCode.RichTextBlockFormatter(Extensions.GetOneDarkProStyle());
//#else
//            var formatter = new ColorCode.RichTextBlockFormatter(Extensions.GetOneDarkProStyle());
//#endif
            var stringBuilder = new StringBuilder();

            // go through all the lines backwards and only add the lines to a stack if we have encountered the first non-empty line
            var lines = fencedCodeBlock.Lines.Lines;
            var stack = new Stack<string>();
            var encounteredFirstNonEmptyLine = false;
            if (lines != null)
            {
                for (var i = lines.Length - 1; i >= 0; i--)
                {
                    var line = lines[i];
                    if (String.IsNullOrWhiteSpace(line.ToString()) && !encounteredFirstNonEmptyLine)
                    {
                        continue;
                    }

                    encounteredFirstNonEmptyLine = true;
                    stack.Push(line.ToString());
                }

                // append all the lines in the stack to the string builder
                while (stack.Count > 0)
                {
                    stringBuilder.AppendLine(stack.Pop());
                }
            }

            //formatter.FormatRichTextBlock(stringBuilder.ToString(), fencedCodeBlock.ToLanguage(), richTextBlock);
        }
        else
        {
            foreach (var line in codeBlock.Lines.Lines)
            {
                var paragraph = new Paragraph();
                var lineString = line.ToString();
                if (!String.IsNullOrWhiteSpace(lineString))
                {
                    paragraph.Inlines.Add(new Run() { Text = lineString });
                }
                richTextBlock.Blocks.Add(paragraph);
            }
        }
        border.Child = richTextBlock;
        container.Child = border;
        _paragraph.Inlines.Add(container);
    }

    public void AddChild(IAddChild child) {}
}

1) Add in the pre-release version of the MarkdownTextBox from Labs-Windows feed.
2) Add MarkdownTextBox to XAML page.
3) Add in markdown text that contains a code snippet.
4) Code block is rendered and it appears empty with no content.