using System;
using Org.BouncyCastle.Utilities;

namespace Org.BouncyCastle.Asn1;

public class DerBmpString : DerStringBase
{
	private readonly string str;

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

	public static DerBmpString GetInstance(Asn1TaggedObject obj, bool isExplicit)
	{
		Asn1Object asn1Object = obj.GetObject();
		if (isExplicit || asn1Object is DerBmpString)
		{
			return GetInstance(asn1Object);
		}
		return new DerBmpString(Asn1OctetString.GetInstance(asn1Object).GetOctets());
	}

	public DerBmpString(byte[] str)
	{
		if (str == null)
		{
			throw new ArgumentNullException("str");
		}
		char[] array = new char[str.Length / 2];
		for (int i = 0; i != array.Length; i++)
		{
			array[i] = (char)((str[2 * i] << 8) | (str[2 * i + 1] & 0xFF));
		}
		this.str = new string(array);
	}

	public DerBmpString(string str)
	{
		if (str == null)
		{
			throw new ArgumentNullException("str");
		}
		this.str = str;
	}

	public override string GetString()
	{
		return str;
	}

	protected override bool Asn1Equals(Asn1Object asn1Object)
	{
		if (!(asn1Object is DerBmpString derBmpString))
		{
			return false;
		}
		return str.Equals(derBmpString.str);
	}

	internal override void Encode(DerOutputStream derOut)
	{
		char[] array = str.ToCharArray();
		byte[] array2 = new byte[array.Length * 2];
		for (int i = 0; i != array.Length; i++)
		{
			array2[2 * i] = (byte)((int)array[i] >> 8);
			array2[2 * i + 1] = (byte)array[i];
		}
		derOut.WriteEncoded(30, array2);
	}
}