using System;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.X509;

namespace Org.BouncyCastle.Asn1.Ocsp
{
    public class ServiceLocator
        : Asn1Encodable
    {
        private readonly X509Name issuer;
        private readonly Asn1Object locator;

		public static ServiceLocator GetInstance(
			Asn1TaggedObject	obj,
			bool				explicitly)
		{
			return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
		}

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

			if (obj is Asn1Sequence)
			{
				return new ServiceLocator((Asn1Sequence) obj);
			}

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

		public ServiceLocator(
			X509Name	issuer)
			: this(issuer, null)
		{
		}

		public ServiceLocator(
			X509Name	issuer,
			Asn1Object	locator)
		{
			if (issuer == null)
				throw new ArgumentNullException("issuer");

			this.issuer = issuer;
			this.locator = locator;
		}

		private ServiceLocator(
			Asn1Sequence seq)
		{
			this.issuer = X509Name.GetInstance(seq[0]);

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

		public X509Name Issuer
		{
			get { return issuer; }
		}

		public Asn1Object Locator
		{
			get { return locator; }
		}

		/**
         * Produce an object suitable for an Asn1OutputStream.
         * <pre>
         * ServiceLocator ::= Sequence {
         *     issuer    Name,
         *     locator   AuthorityInfoAccessSyntax OPTIONAL }
         * </pre>
         */
        public override Asn1Object ToAsn1Object()
        {
            Asn1EncodableVector v = new Asn1EncodableVector(issuer);

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

			return new DerSequence(v);
        }
    }
}
