using System;

namespace Org.BouncyCastle.Asn1.Esf
{
	/// <remarks>
	/// RFC 3126: 4.2.2 Complete Revocation Refs Attribute Definition
	/// <code>
	/// CrlValidatedID ::= SEQUENCE {
	///		crlHash			OtherHash,
	///		crlIdentifier	CrlIdentifier OPTIONAL}
	/// </code>
	/// </remarks>
	public class CrlValidatedID
		: Asn1Encodable
	{
		private readonly OtherHash		crlHash;
		private readonly CrlIdentifier	crlIdentifier;

		public static CrlValidatedID GetInstance(
			object obj)
		{
			if (obj == null || obj is CrlValidatedID)
				return (CrlValidatedID) obj;

			if (obj is Asn1Sequence)
				return new CrlValidatedID((Asn1Sequence) obj);

			throw new ArgumentException(
				"Unknown object in 'CrlValidatedID' factory: "
					+ obj.GetType().Name,
				"obj");
		}

		private CrlValidatedID(
			Asn1Sequence seq)
		{
			if (seq == null)
				throw new ArgumentNullException("seq");
			if (seq.Count < 1 || seq.Count > 2)
				throw new ArgumentException("Bad sequence size: " + seq.Count, "seq");

			this.crlHash = OtherHash.GetInstance(seq[0].ToAsn1Object());

			if (seq.Count > 1)
			{
				this.crlIdentifier = CrlIdentifier.GetInstance(seq[1].ToAsn1Object());
			}
		}

		public CrlValidatedID(
			OtherHash crlHash)
			: this(crlHash, null)
		{
		}

		public CrlValidatedID(
			OtherHash		crlHash,
			CrlIdentifier	crlIdentifier)
		{
			if (crlHash == null)
				throw new ArgumentNullException("crlHash");

			this.crlHash = crlHash;
			this.crlIdentifier = crlIdentifier;
		}

		public OtherHash CrlHash
		{
			get { return crlHash; }
		}

		public CrlIdentifier CrlIdentifier
		{
			get { return crlIdentifier; }
		}

		public override Asn1Object ToAsn1Object()
		{
			Asn1EncodableVector v = new Asn1EncodableVector(crlHash.ToAsn1Object());

			if (crlIdentifier != null)
			{
				v.Add(crlIdentifier.ToAsn1Object());
			}

			return new DerSequence(v);
		}
	}
}