using System;

using Org.BouncyCastle.Asn1.X509;

namespace Org.BouncyCastle.Asn1.Ess
{
	public class SigningCertificateV2
		: Asn1Encodable
	{
		private readonly Asn1Sequence certs;
		private readonly Asn1Sequence policies;

		public static SigningCertificateV2 GetInstance(
			object o)
		{
			if (o == null || o is SigningCertificateV2)
				return (SigningCertificateV2) o;

			if (o is Asn1Sequence)
				return new SigningCertificateV2((Asn1Sequence) o);

			throw new ArgumentException(
				"unknown object in 'SigningCertificateV2' factory : "
				+ o.GetType().Name + ".");
		}

		private SigningCertificateV2(
			Asn1Sequence seq)
		{
			if (seq.Count < 1 || seq.Count > 2)
				throw new ArgumentException("Bad sequence size: " + seq.Count, "seq");

			this.certs = Asn1Sequence.GetInstance(seq[0].ToAsn1Object());

			if (seq.Count > 1)
			{
				this.policies = Asn1Sequence.GetInstance(seq[1].ToAsn1Object());
			}
		}

		public SigningCertificateV2(
			EssCertIDv2[] certs)
		{
			this.certs = new DerSequence(certs);
		}

		public SigningCertificateV2(
			EssCertIDv2[]		certs,
			PolicyInformation[]	policies)
		{
			this.certs = new DerSequence(certs);

			if (policies != null)
			{
				this.policies = new DerSequence(policies);
			}
		}

		public EssCertIDv2[] GetCerts()
		{
			EssCertIDv2[] certIds = new EssCertIDv2[certs.Count];
			for (int i = 0; i != certs.Count; i++)
			{
				certIds[i] = EssCertIDv2.GetInstance(certs[i]);
			}
			return certIds;
		}

		public PolicyInformation[] GetPolicies()
		{
			if (policies == null)
				return null;

			PolicyInformation[] policyInformations = new PolicyInformation[policies.Count];
			for (int i = 0; i != policies.Count; i++)
			{
				policyInformations[i] = PolicyInformation.GetInstance(policies[i]);
			}
			return policyInformations;
		}

		/**
		 * The definition of SigningCertificateV2 is
		 * <pre>
		 * SigningCertificateV2 ::=  SEQUENCE {
		 *      certs        SEQUENCE OF EssCertIDv2,
		 *      policies     SEQUENCE OF PolicyInformation OPTIONAL
		 * }
		 * </pre>
		 * id-aa-signingCertificateV2 OBJECT IDENTIFIER ::= { iso(1)
		 *    member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs9(9)
		 *    smime(16) id-aa(2) 47 }
		 */
		public override Asn1Object ToAsn1Object()
		{
			Asn1EncodableVector v = new Asn1EncodableVector(certs);

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

			return new DerSequence(v);
		}
	}
}
