using System.Collections.Generic;
using AcDream.Plugin.Abstractions;

namespace AcDream.App.Plugins;

/// <summary>
/// Buffers plugin <see cref="IUiRegistry.AddMarkupPanel"/> calls (which run in
/// Program.cs before the GL window opens) until GameWindow drains them into the
/// UiHost tree after construction.
/// </summary>
public sealed class BufferedUiRegistry : IUiRegistry
{
    public readonly record struct Pending(string MarkupPath, object Binding);

    private readonly List<Pending> _pending = new();

    public void AddMarkupPanel(string markupPath, object binding)
        => _pending.Add(new Pending(markupPath, binding));

    /// <summary>Return + clear all buffered registrations.</summary>
    public IReadOnlyList<Pending> Drain()
    {
        var copy = _pending.ToArray();
        _pending.Clear();
        return copy;
    }
}