@using System.Text.RegularExpressions
@using Microsoft.AspNetCore.Components.Rendering
@using Model
@namespace Shared.Components

@if (Doc != null)
{
    <div class="modal-backdrop" @onclick="HandleBackdropClick"></div>
    <div class="generic-detail">
        <button class="detail-close" @onclick="HandleClose"><i class="bi bi-x-lg"></i></button>
        <div class="detail-layout">
            <div class="detail-info">
                <div class="detail-header">
                    @if (!string.IsNullOrEmpty(Doc.Category))
                    {
                        <span class="category-badge">@Doc.Category</span>
                    }
                    <h2>@Doc.Title</h2>
                </div>

                @if (!string.IsNullOrWhiteSpace(Doc.Content))
                {
                    <div class="detail-field description">
                        <div class="markdown-content">
                            @RenderDescription(Doc.Content)
                        </div>
                    </div>
                }
            </div>
        </div>
    </div>
}

@code {
    [Parameter] public DocData? Doc { get; set; }
    [Parameter] public EventCallback OnClose { get; set; }

    private void HandleClose()
    {
        _ = OnClose.InvokeAsync();
    }

    private void HandleBackdropClick()
    {
        _ = OnClose.InvokeAsync();
    }

    private RenderFragment RenderDescription(string content)
    {
        return builder =>
        {
            if (string.IsNullOrWhiteSpace(content)) return;

            var seq = 0;
            var lines = content.Split(['\r', '\n'], StringSplitOptions.None);
            var inList = false;

            for (var i = 0; i < lines.Length; i++)
            {
                var line = lines[i];
                var trimmedLine = line.Trim();

                // Handle Lists
                if (trimmedLine.StartsWith("- ") || trimmedLine.StartsWith("* "))
                {
                    if (!inList)
                    {
                        builder.OpenElement(seq++, "ul");
                        inList = true;
                    }

                    builder.OpenElement(seq++, "li");
                    RenderInlines(builder, ref seq, trimmedLine[2..]);
                    builder.CloseElement();
                    continue;
                }

                if (inList)
                {
                    builder.CloseElement();
                    inList = false;
                }

                if (!string.IsNullOrWhiteSpace(trimmedLine))
                {
                    builder.OpenElement(seq++, "p");
                    RenderInlines(builder, ref seq, line);
                    builder.CloseElement();
                }
            }

            if (inList) builder.CloseElement();
        };
    }

    private void RenderInlines(RenderTreeBuilder builder, ref int seq, string text)
    {
        var remaining = text;
        while (!string.IsNullOrEmpty(remaining))
        {
            var boldMatch = Regex.Match(remaining, @"\*\*(.*?)\*\*");
            var italicMatch = Regex.Match(remaining, @"\*(.*?)\*");

            var bestIdx = int.MaxValue;
            Match? bestMatch = null;
            var matchType = 0; // 1: bold, 2: italic

            if (boldMatch.Success && boldMatch.Index < bestIdx)
            {
                bestIdx = boldMatch.Index;
                bestMatch = boldMatch;
                matchType = 1;
            }

            if (italicMatch.Success && italicMatch.Index < bestIdx)
            {
                bestIdx = italicMatch.Index;
                bestMatch = italicMatch;
                matchType = 2;
            }

            if (bestMatch != null)
            {
                if (bestIdx > 0) builder.AddContent(seq++, remaining[..bestIdx]);
                var innerText = bestMatch.Groups[1].Value;
                builder.OpenElement(seq++, matchType == 1 ? "strong" : "em");
                builder.AddContent(seq++, innerText);
                builder.CloseElement();
                remaining = remaining[(bestIdx + bestMatch.Length)..];
            }
            else
            {
                builder.AddContent(seq++, remaining);
                remaining = "";
            }
        }
    }

}