namespace IdentityShroud.Core;

public class JwtSignerFactory(IEnumerable<IJwtSigner> signers) : IJwtSignerFactory
{
    private readonly IReadOnlyDictionary<JwtSigAlgName, IJwtSigner> _signers = signers
        .SelectMany(s => s.Algorithms.Select(alg => (alg, signer: s)))
        .ToDictionary(x => x.alg, x => x.signer);
    
    public IJwtSigner Create(JwtSigAlgName algorithm)
    {
        if (_signers.TryGetValue(algorithm, out var signer))
            return signer;

        throw new NotSupportedException($"JWT signing algorithm '{algorithm}' is not registered.");
    }
    
}