using Connected.Middleware;
using Connected.Security.Authentication.Middleware;
using Connected.Threading;

namespace Connected.Security.Authentication;

/// <summary>
/// The implementation of the <see cref="IAuthenticationService"/>.
/// </summary>
internal sealed class AuthenticationService : IAuthenticationService
{
	public AuthenticationService(IMiddlewareService middleware)
	{
		Provider = new AsyncLazy<IAuthenticationMiddleware>(middleware.First<IAuthenticationMiddleware>());
	}

	private AsyncLazy<IAuthenticationMiddleware> Provider { get; }
	public async Task<IAuthenticationResult> Authenticate(AuthenticationArgs args)
	{
		var provider = await Provider.Value;

		if (provider is null)
			throw new NullReferenceException(nameof(IAuthenticationMiddleware));

		return await provider.Authenticate(args);
	}
}