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using System;

using Org.BouncyCastle.Asn1.X509;

namespace Org.BouncyCastle.Asn1.Ess
{
	public class EssCertID
		: Asn1Encodable
	{
		private Asn1OctetString certHash;
		private IssuerSerial issuerSerial;

		public static EssCertID GetInstance(
			object o)
		{
			if (o == null || o is EssCertID)
			{
				return (EssCertID) o;
			}

			if (o is Asn1Sequence)
			{
				return new EssCertID((Asn1Sequence) o);
			}

			throw new ArgumentException(
				"unknown object in 'EssCertID' factory : "
				+ o.GetType().Name + ".");
		}

		/**
		 * constructor
		 */
		public EssCertID(
			Asn1Sequence seq)
		{
			if (seq.Count < 1 || seq.Count > 2)
			{
				throw new ArgumentException("Bad sequence size: " + seq.Count);
			}

			this.certHash = Asn1OctetString.GetInstance(seq[0]);

			if (seq.Count > 1)
			{
				issuerSerial = IssuerSerial.GetInstance(seq[1]);
			}
		}

		public EssCertID(
			byte[] hash)
		{
			certHash = new DerOctetString(hash);
		}

		public EssCertID(
			byte[]			hash,
			IssuerSerial	issuerSerial)
		{
			this.certHash = new DerOctetString(hash);
			this.issuerSerial = issuerSerial;
		}

		public byte[] GetCertHash()
		{
			return certHash.GetOctets();
		}

		public IssuerSerial IssuerSerial
		{
			get { return issuerSerial; }
		}

		/**
		 * <pre>
		 * EssCertID ::= SEQUENCE {
		 *     certHash Hash,
		 *     issuerSerial IssuerSerial OPTIONAL }
		 * </pre>
		 */
		public override Asn1Object ToAsn1Object()
		{
			Asn1EncodableVector v = new Asn1EncodableVector(certHash);

			if (issuerSerial != null)
			{
				v.Add(issuerSerial);
			}

			return new DerSequence(v);
		}
	}
}