using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Svrnty.CQRS.Abstractions.Security;

namespace Svrnty.CQRS.Altcha;

public static class ServiceCollectionExtensions
{
    /// <summary>
    /// Registers <see cref="AltchaAuthorizationCheck"/> as both an
    /// <see cref="ICommandAuthorizationCheck"/> and an
    /// <see cref="IQueryAuthorizationCheck"/>. The check is a no-op until
    /// an <see cref="Svrnty.CQRS.Altcha.Abstractions.IAltchaVerifier"/>
    /// implementation is also registered (typically via
    /// <c>AddSvrntyAltchaGrpcVerifier(...)</c> from
    /// <c>Svrnty.CQRS.Altcha.Grpc</c>).
    /// </summary>
    /// <remarks>
    /// Idempotent for the concrete check; the multi-instance interface
    /// registrations are added unconditionally, so callers should invoke
    /// this exactly once per application startup.
    /// </remarks>
    public static IServiceCollection AddSvrntyAltcha(this IServiceCollection services)
    {
        services.TryAddSingleton<AltchaAuthorizationCheck>();
        services.AddSingleton<ICommandAuthorizationCheck>(sp => sp.GetRequiredService<AltchaAuthorizationCheck>());
        services.AddSingleton<IQueryAuthorizationCheck>(sp => sp.GetRequiredService<AltchaAuthorizationCheck>());
        return services;
    }
}