using System;
using System.Collections;
using System.IO;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Collections;

namespace Org.BouncyCastle.Asn1;

public abstract class Asn1Sequence : Asn1Object, IEnumerable
{
	private class Asn1SequenceParserImpl : Asn1SequenceParser, IAsn1Convertible
	{
		private readonly Asn1Sequence outer;

		private readonly int max;

		private int index;

		public Asn1SequenceParserImpl(Asn1Sequence outer)
		{
			this.outer = outer;
			max = outer.Count;
		}

		public IAsn1Convertible ReadObject()
		{
			if (index == max)
			{
				return null;
			}
			Asn1Encodable asn1Encodable = outer[index++];
			if (asn1Encodable is Asn1Sequence)
			{
				return ((Asn1Sequence)asn1Encodable).Parser;
			}
			if (asn1Encodable is Asn1Set)
			{
				return ((Asn1Set)asn1Encodable).Parser;
			}
			return asn1Encodable;
		}

		public Asn1Object ToAsn1Object()
		{
			return outer;
		}
	}

	private readonly IList seq;

	public virtual Asn1SequenceParser Parser => new Asn1SequenceParserImpl(this);

	public virtual Asn1Encodable this[int index] => (Asn1Encodable)seq[index];

	[Obsolete("Use 'Count' property instead")]
	public int Size => Count;

	public virtual int Count => seq.Count;

	public static Asn1Sequence GetInstance(object obj)
	{
		if (obj == null || obj is Asn1Sequence)
		{
			return (Asn1Sequence)obj;
		}
		if (obj is Asn1SequenceParser)
		{
			return GetInstance(((Asn1SequenceParser)obj).ToAsn1Object());
		}
		if (obj is byte[])
		{
			try
			{
				return GetInstance(Asn1Object.FromByteArray((byte[])obj));
			}
			catch (IOException ex)
			{
				throw new ArgumentException("failed to construct sequence from byte[]: " + ex.Message);
			}
		}
		if (obj is Asn1Encodable)
		{
			Asn1Object asn1Object = ((Asn1Encodable)obj).ToAsn1Object();
			if (asn1Object is Asn1Sequence)
			{
				return (Asn1Sequence)asn1Object;
			}
		}
		throw new ArgumentException("Unknown object in GetInstance: " + Platform.GetTypeName(obj), "obj");
	}

	public static Asn1Sequence GetInstance(Asn1TaggedObject obj, bool explicitly)
	{
		Asn1Object asn1Object = obj.GetObject();
		if (explicitly)
		{
			if (!obj.IsExplicit())
			{
				throw new ArgumentException("object implicit - explicit expected.");
			}
			return (Asn1Sequence)asn1Object;
		}
		if (obj.IsExplicit())
		{
			if (obj is BerTaggedObject)
			{
				return new BerSequence(asn1Object);
			}
			return new DerSequence(asn1Object);
		}
		if (asn1Object is Asn1Sequence)
		{
			return (Asn1Sequence)asn1Object;
		}
		throw new ArgumentException("Unknown object in GetInstance: " + Platform.GetTypeName(obj), "obj");
	}

	protected internal Asn1Sequence(int capacity)
	{
		seq = Platform.CreateArrayList(capacity);
	}

	public virtual IEnumerator GetEnumerator()
	{
		return seq.GetEnumerator();
	}

	[Obsolete("Use GetEnumerator() instead")]
	public IEnumerator GetObjects()
	{
		return GetEnumerator();
	}

	[Obsolete("Use 'object[index]' syntax instead")]
	public Asn1Encodable GetObjectAt(int index)
	{
		return this[index];
	}

	protected override int Asn1GetHashCode()
	{
		int num = Count;
		IEnumerator enumerator = GetEnumerator();
		try
		{
			while (enumerator.MoveNext())
			{
				object current = enumerator.Current;
				num *= 17;
				num = ((current != null) ? (num ^ current.GetHashCode()) : (num ^ DerNull.Instance.GetHashCode()));
			}
			return num;
		}
		finally
		{
			IDisposable disposable = enumerator as IDisposable;
			if (disposable != null)
			{
				disposable.Dispose();
			}
		}
	}

	protected override bool Asn1Equals(Asn1Object asn1Object)
	{
		if (!(asn1Object is Asn1Sequence asn1Sequence))
		{
			return false;
		}
		if (Count != asn1Sequence.Count)
		{
			return false;
		}
		IEnumerator enumerator = GetEnumerator();
		IEnumerator enumerator2 = asn1Sequence.GetEnumerator();
		while (enumerator.MoveNext() && enumerator2.MoveNext())
		{
			Asn1Object asn1Object2 = GetCurrent(enumerator).ToAsn1Object();
			Asn1Object obj = GetCurrent(enumerator2).ToAsn1Object();
			if (!asn1Object2.Equals(obj))
			{
				return false;
			}
		}
		return true;
	}

	private Asn1Encodable GetCurrent(IEnumerator e)
	{
		Asn1Encodable asn1Encodable = (Asn1Encodable)e.Current;
		if (asn1Encodable == null)
		{
			return DerNull.Instance;
		}
		return asn1Encodable;
	}

	protected internal void AddObject(Asn1Encodable obj)
	{
		seq.Add(obj);
	}

	public override string ToString()
	{
		return CollectionUtilities.ToString(seq);
	}
}