using System;

namespace Org.BouncyCastle.Asn1.Cmp
{
	public class KeyRecRepContent
		: Asn1Encodable
	{
        public static KeyRecRepContent GetInstance(object obj)
        {
            if (obj == null)
                return null;
            if (obj is KeyRecRepContent keyRecRepContent)
                return keyRecRepContent;
            return new KeyRecRepContent(Asn1Sequence.GetInstance(obj));
        }

        public static KeyRecRepContent GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
        {
            return new KeyRecRepContent(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
        }

        private readonly PkiStatusInfo m_status;
		private readonly CmpCertificate m_newSigCert;
		private readonly Asn1Sequence m_caCerts;
		private readonly Asn1Sequence m_keyPairHist;

		private KeyRecRepContent(Asn1Sequence seq)
		{
            int count = seq.Count, pos = 0;
            if (count < 1 || count > 4)
                throw new ArgumentException("Bad sequence size: " + count, nameof(seq));

            m_status = PkiStatusInfo.GetInstance(seq[pos++]);
            m_newSigCert = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 0, true, CmpCertificate.GetInstance);
            m_caCerts = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 1, true, Asn1Sequence.GetInstance);
            m_keyPairHist = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 2, true, Asn1Sequence.GetInstance);

            if (pos != count)
                throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
        }

		public virtual PkiStatusInfo Status => m_status;

		public virtual CmpCertificate NewSigCert => m_newSigCert;

		public virtual CmpCertificate[] GetCACerts() => m_caCerts?.MapElements(CmpCertificate.GetInstance);

		public virtual CertifiedKeyPair[] GetKeyPairHist() => m_keyPairHist?.MapElements(CertifiedKeyPair.GetInstance);

		/**
		 * <pre>
		 * KeyRecRepContent ::= SEQUENCE {
		 *                         status                  PKIStatusInfo,
		 *                         newSigCert          [0] CMPCertificate OPTIONAL,
		 *                         caCerts             [1] SEQUENCE SIZE (1..MAX) OF
		 *                                                           CMPCertificate OPTIONAL,
		 *                         keyPairHist         [2] SEQUENCE SIZE (1..MAX) OF
		 *                                                           CertifiedKeyPair OPTIONAL
		 *              }
		 * </pre> 
		 * @return a basic ASN.1 object representation.
		 */
		public override Asn1Object ToAsn1Object()
		{
			Asn1EncodableVector v = new Asn1EncodableVector(4);
			v.Add(m_status);
            v.AddOptionalTagged(true, 0, m_newSigCert);
            v.AddOptionalTagged(true, 1, m_caCerts);
            v.AddOptionalTagged(true, 2, m_keyPairHist);
			return new DerSequence(v);
		}
	}
}