namespace NucleicApp.Services;

/// Isolates WinUI's DispatcherQueue from the renderer state machine and keeps tests portable.
public interface IRendererDispatcher
{
    void Post(Action action);
}

public sealed class SynchronizationContextDispatcher : IRendererDispatcher
{
    private readonly SynchronizationContext context;

    public SynchronizationContextDispatcher(SynchronizationContext? context = null)
    {
        this.context = context ?? SynchronizationContext.Current
            ?? throw new InvalidOperationException("renderer has no SynchronizationContext");
    }

    public void Post(Action action) => context.Post(static state => ((Action)state!).Invoke(), action);
}

public sealed class InlineRendererDispatcher : IRendererDispatcher
{
    public static InlineRendererDispatcher Instance { get; } = new();
    private InlineRendererDispatcher() { }
    public void Post(Action action) => action();
}