using Svrnty.CQRS.Altcha.Abstractions;

namespace Svrnty.CQRS.Altcha;

/// <summary>
/// No-op fallback registered by <c>AddSvrntyAltcha()</c>. Always returns
/// <c>null</c>, leaving complexity at the upstream Altcha service's
/// configured default. Applications that want adaptive difficulty
/// replace this registration with their own implementation.
/// </summary>
internal sealed class NullAltchaDifficultyAdvisor : IAltchaDifficultyAdvisor
{
    public Task<uint?> GetComplexityAsync(CancellationToken cancellationToken = default)
        => Task.FromResult<uint?>(null);
}