using System;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Utilities;

namespace Org.BouncyCastle.Asn1.X509;

public class DsaParameter : Asn1Encodable
{
	internal readonly DerInteger p;

	internal readonly DerInteger q;

	internal readonly DerInteger g;

	public BigInteger P => p.PositiveValue;

	public BigInteger Q => q.PositiveValue;

	public BigInteger G => g.PositiveValue;

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

	public static DsaParameter GetInstance(object obj)
	{
		if (obj == null || obj is DsaParameter)
		{
			return (DsaParameter)obj;
		}
		if (obj is Asn1Sequence)
		{
			return new DsaParameter((Asn1Sequence)obj);
		}
		throw new ArgumentException("Invalid DsaParameter: " + Platform.GetTypeName(obj));
	}

	public DsaParameter(BigInteger p, BigInteger q, BigInteger g)
	{
		this.p = new DerInteger(p);
		this.q = new DerInteger(q);
		this.g = new DerInteger(g);
	}

	private DsaParameter(Asn1Sequence seq)
	{
		if (seq.Count != 3)
		{
			throw new ArgumentException("Bad sequence size: " + seq.Count, "seq");
		}
		p = DerInteger.GetInstance(seq[0]);
		q = DerInteger.GetInstance(seq[1]);
		g = DerInteger.GetInstance(seq[2]);
	}

	public override Asn1Object ToAsn1Object()
	{
		return new DerSequence(p, q, g);
	}
}