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

namespace Org.BouncyCastle.Asn1.CryptoPro;

public class Gost3410ParamSetParameters : Asn1Encodable
{
	private readonly int keySize;

	private readonly DerInteger p;

	private readonly DerInteger q;

	private readonly DerInteger a;

	public int KeySize => keySize;

	public BigInteger P => p.PositiveValue;

	public BigInteger Q => q.PositiveValue;

	public BigInteger A => a.PositiveValue;

	public static Gost3410ParamSetParameters GetInstance(Asn1TaggedObject obj, bool explicitly)
	{
		return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
	}

	public static Gost3410ParamSetParameters GetInstance(object obj)
	{
		if (obj == null || obj is Gost3410ParamSetParameters)
		{
			return (Gost3410ParamSetParameters)obj;
		}
		if (obj is Asn1Sequence)
		{
			return new Gost3410ParamSetParameters((Asn1Sequence)obj);
		}
		throw new ArgumentException("Invalid GOST3410Parameter: " + Platform.GetTypeName(obj));
	}

	public Gost3410ParamSetParameters(int keySize, BigInteger p, BigInteger q, BigInteger a)
	{
		this.keySize = keySize;
		this.p = new DerInteger(p);
		this.q = new DerInteger(q);
		this.a = new DerInteger(a);
	}

	private Gost3410ParamSetParameters(Asn1Sequence seq)
	{
		if (seq.Count != 4)
		{
			throw new ArgumentException("Wrong number of elements in sequence", "seq");
		}
		keySize = DerInteger.GetInstance(seq[0]).Value.IntValue;
		p = DerInteger.GetInstance(seq[1]);
		q = DerInteger.GetInstance(seq[2]);
		a = DerInteger.GetInstance(seq[3]);
	}

	public override Asn1Object ToAsn1Object()
	{
		return new DerSequence(new DerInteger(keySize), p, q, a);
	}
}