/// <summary>
///     Renders a link-cards block as a responsive grid.
/// </summary>
public sealed class LinkCardsRenderer : HtmlObjectRenderer<LinkCardsBlock>
{
    /// <inheritdoc/>
    protected override void Write(HtmlRenderer renderer, LinkCardsBlock block)
    {
        renderer.EnsureLine();
        renderer.Write("<div class=\"component-link-cards\">");
        renderer.WriteLine();
        // Walk through the AST to find list items with links
        foreach (Block child in block)
        {
            if (child is ListBlock list)
            {
                foreach (Block listItem in list)
                {
                    if (listItem is ListItemBlock item)
                    {
                        RenderLinkCard(renderer, item);
                    }
                }
            }
        }

        renderer.Write("</div>");
        renderer.WriteLine();
    }

    private static void RenderLinkCard(HtmlRenderer renderer, ListItemBlock item)
    {
        // Extract the link and description from the list item
        string? href = null;
        string? title = null;
        string? description = null;
        foreach (Block block in item)
        {
            if (block is ParagraphBlock para && para.Inline != null)
            {
                foreach (Inline inline in para.Inline)
                {
                    if (inline is LinkInline link)
                    {
                        href = link.Url;
                        // Get link text
                        var sb = new StringBuilder();
                        foreach (Inline linkChild in link)
                        {
                            if (linkChild is LiteralInline lit)
                            {
                                sb.Append(lit.Content);
                            }
                        }

                        title = sb.ToString();
                    }
                    else if (inline is LiteralInline literal)
                    {
                        string text = literal.Content.ToString().Trim();
                        // The description follows " — " or " - " after the link
                        if (text.StartsWith("—") || text.StartsWith("-"))
                        {
                            description = text.TrimStart('—', '-', ' ');
                        }
                        else if (!string.IsNullOrWhiteSpace(text))
                        {
                            description = text;
                        }
                    }
                }
            }
        }

        if (string.IsNullOrEmpty(href) || string.IsNullOrEmpty(title))
        {
            return;
        }

        renderer.Write($"<a class=\"component-link-card\" href=\"{href}\">");
        renderer.WriteLine();
        renderer.Write("<div class=\"component-link-card-content\">");
        renderer.WriteLine();
        renderer.Write($"<span class=\"component-link-card-title\">{title}</span>");
        renderer.WriteLine();
        if (!string.IsNullOrEmpty(description))
        {
            renderer.Write($"<span class=\"component-link-card-desc\">{description}</span>");
            renderer.WriteLine();
        }

        renderer.Write("</div>");
        renderer.WriteLine();
        renderer.Write("<span class=\"component-link-card-arrow\">");
        renderer.Write("<svg width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><polyline points=\"9 18 15 12 9 6\"/></svg>");
        renderer.Write("</span>");
        renderer.WriteLine();
        renderer.Write("</a>");
        renderer.WriteLine();
    }
}