using System;

using Org.BouncyCastle.Utilities;

namespace Org.BouncyCastle.Asn1.Cmp
{
	public class CertRepMessage
		: Asn1Encodable
	{
        public static CertRepMessage GetInstance(object obj)
        {
            if (obj is CertRepMessage certRepMessage)
                return certRepMessage;

            if (obj != null)
				return new CertRepMessage(Asn1Sequence.GetInstance(obj));

			return null;
        }

        private readonly Asn1Sequence m_caPubs;
		private readonly Asn1Sequence m_response;
		
		private CertRepMessage(Asn1Sequence seq)
		{
			int index = 0;

			if (seq.Count > 1)
			{
				m_caPubs = Asn1Sequence.GetInstance((Asn1TaggedObject)seq[index++], true);
			}

			m_response = Asn1Sequence.GetInstance(seq[index]);
		}

		public CertRepMessage(CmpCertificate[] caPubs, CertResponse[] response)
		{
			if (response == null)
				throw new ArgumentNullException(nameof(response));

			if (caPubs != null)
			{
				m_caPubs = new DerSequence(caPubs);
			}

			m_response = new DerSequence(response);
		}

		public virtual CmpCertificate[] GetCAPubs()
		{
			return m_caPubs == null ? null : m_caPubs.MapElements(CmpCertificate.GetInstance);
		}

		public virtual CertResponse[] GetResponse()
		{
            return m_response.MapElements(CertResponse.GetInstance);
		}

		/**
		 * <pre>
		 * CertRepMessage ::= SEQUENCE {
		 *                          caPubs       [1] SEQUENCE SIZE (1..MAX) OF CMPCertificate
		 *                                                                             OPTIONAL,
		 *                          response         SEQUENCE OF CertResponse
		 * }
		 * </pre>
		 * @return a basic ASN.1 object representation.
		 */
		public override Asn1Object ToAsn1Object()
		{
			Asn1EncodableVector v = new Asn1EncodableVector(2);
            v.AddOptionalTagged(true, 1, m_caPubs);
			v.Add(m_response);
			return new DerSequence(v);
		}
	}
}