using System;
using Org.BouncyCastle.Utilities;

namespace Org.BouncyCastle.Asn1.Cms;

public class RecipientInfo : Asn1Encodable, IAsn1Choice
{
	internal Asn1Encodable info;

	public DerInteger Version
	{
		get
		{
			if (info is Asn1TaggedObject)
			{
				Asn1TaggedObject asn1TaggedObject = (Asn1TaggedObject)info;
				return asn1TaggedObject.TagNo switch
				{
					1 => KeyAgreeRecipientInfo.GetInstance(asn1TaggedObject, explicitly: false).Version, 
					2 => GetKekInfo(asn1TaggedObject).Version, 
					3 => PasswordRecipientInfo.GetInstance(asn1TaggedObject, explicitly: false).Version, 
					4 => new DerInteger(0), 
					_ => throw new InvalidOperationException("unknown tag"), 
				};
			}
			return KeyTransRecipientInfo.GetInstance(info).Version;
		}
	}

	public bool IsTagged => info is Asn1TaggedObject;

	public Asn1Encodable Info
	{
		get
		{
			if (info is Asn1TaggedObject)
			{
				Asn1TaggedObject asn1TaggedObject = (Asn1TaggedObject)info;
				return asn1TaggedObject.TagNo switch
				{
					1 => KeyAgreeRecipientInfo.GetInstance(asn1TaggedObject, explicitly: false), 
					2 => GetKekInfo(asn1TaggedObject), 
					3 => PasswordRecipientInfo.GetInstance(asn1TaggedObject, explicitly: false), 
					4 => OtherRecipientInfo.GetInstance(asn1TaggedObject, explicitly: false), 
					_ => throw new InvalidOperationException("unknown tag"), 
				};
			}
			return KeyTransRecipientInfo.GetInstance(info);
		}
	}

	public RecipientInfo(KeyTransRecipientInfo info)
	{
		this.info = info;
	}

	public RecipientInfo(KeyAgreeRecipientInfo info)
	{
		this.info = new DerTaggedObject(explicitly: false, 1, info);
	}

	public RecipientInfo(KekRecipientInfo info)
	{
		this.info = new DerTaggedObject(explicitly: false, 2, info);
	}

	public RecipientInfo(PasswordRecipientInfo info)
	{
		this.info = new DerTaggedObject(explicitly: false, 3, info);
	}

	public RecipientInfo(OtherRecipientInfo info)
	{
		this.info = new DerTaggedObject(explicitly: false, 4, info);
	}

	public RecipientInfo(Asn1Object info)
	{
		this.info = info;
	}

	public static RecipientInfo GetInstance(object o)
	{
		if (o == null || o is RecipientInfo)
		{
			return (RecipientInfo)o;
		}
		if (o is Asn1Sequence)
		{
			return new RecipientInfo((Asn1Sequence)o);
		}
		if (o is Asn1TaggedObject)
		{
			return new RecipientInfo((Asn1TaggedObject)o);
		}
		throw new ArgumentException("unknown object in factory: " + Platform.GetTypeName(o));
	}

	private KekRecipientInfo GetKekInfo(Asn1TaggedObject o)
	{
		return KekRecipientInfo.GetInstance(o, o.IsExplicit());
	}

	public override Asn1Object ToAsn1Object()
	{
		return info.ToAsn1Object();
	}
}