using AvParser.Core.Settings;
using AvParser.UI.Services;
using ReactiveUI.Primitives.Signals;

namespace AvParser.UI.Tests.Fakes;

/// <summary>Theme service with no Avalonia <c>Application</c> behind it.</summary>
internal sealed class FakeThemeService(AppTheme initial = AppTheme.System) : IThemeService, IDisposable
{
    private readonly BehaviorSignal<AppTheme> _current = new(initial);

    public AppTheme Current => _current.Value;

    public IObservable<AppTheme> Changes => _current;

    public void Apply(AppTheme theme)
    {
        if (theme == _current.Value)
        {
            return;
        }

        _current.OnNext(theme);
    }

    public void Dispose() => _current.Dispose();
}