using System.Runtime.CompilerServices;
using ReactiveUI.Builder;
using ReactiveUI.Primitives.Concurrency;

namespace AvParser.UI.Tests;

/// <summary>Initialises ReactiveUI once for the whole test assembly.</summary>
/// <remarks>
/// ReactiveUI 24 no longer self-initialises: <c>WhenAnyValue</c> throws
/// <see cref="InvalidOperationException"/> until the builder has run. In the app that happens
/// inside <c>AppBuilder.UseReactiveUI()</c>; here there is no Avalonia app, so a module
/// initialiser does it before any test constructs a view model.
/// </remarks>
internal static class ReactiveUiBootstrap
{
    [ModuleInitializer]
    internal static void Initialize() =>
        RxAppBuilder
            .CreateReactiveUIBuilder()
            // No dispatcher exists in these tests, so anything ReactiveUI marshals internally
            // must run inline rather than being queued onto a thread that never pumps.
            .WithMainThreadScheduler(ImmediateSequencer.Instance)
            .WithTaskPoolScheduler(ImmediateSequencer.Instance)
            .WithCoreServices()
            .BuildApp();
}