using System;
using Org.BouncyCastle.Utilities;

namespace Org.BouncyCastle.Asn1.Ess;

public class ContentHints : Asn1Encodable
{
	private readonly DerUtf8String contentDescription;

	private readonly DerObjectIdentifier contentType;

	public DerObjectIdentifier ContentType => contentType;

	public DerUtf8String ContentDescription => contentDescription;

	public static ContentHints GetInstance(object o)
	{
		if (o == null || o is ContentHints)
		{
			return (ContentHints)o;
		}
		if (o is Asn1Sequence)
		{
			return new ContentHints((Asn1Sequence)o);
		}
		throw new ArgumentException("unknown object in 'ContentHints' factory : " + Platform.GetTypeName(o) + ".");
	}

	private ContentHints(Asn1Sequence seq)
	{
		IAsn1Convertible asn1Convertible = seq[0];
		if (asn1Convertible.ToAsn1Object() is DerUtf8String)
		{
			contentDescription = DerUtf8String.GetInstance(asn1Convertible);
			contentType = DerObjectIdentifier.GetInstance(seq[1]);
		}
		else
		{
			contentType = DerObjectIdentifier.GetInstance(seq[0]);
		}
	}

	public ContentHints(DerObjectIdentifier contentType)
	{
		this.contentType = contentType;
		contentDescription = null;
	}

	public ContentHints(DerObjectIdentifier contentType, DerUtf8String contentDescription)
	{
		this.contentType = contentType;
		this.contentDescription = contentDescription;
	}

	public override Asn1Object ToAsn1Object()
	{
		Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector();
		if (contentDescription != null)
		{
			asn1EncodableVector.Add(contentDescription);
		}
		asn1EncodableVector.Add(contentType);
		return new DerSequence(asn1EncodableVector);
	}
}