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

namespace Org.BouncyCastle.Asn1;

public abstract class Asn1Set : Asn1Object, IEnumerable
{
	private class Asn1SetParserImpl : Asn1SetParser, IAsn1Convertible
	{
		private readonly Asn1Set outer;

		private readonly int max;

		private int index;

		public Asn1SetParserImpl(Asn1Set 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 virtual Asn1Object ToAsn1Object()
		{
			return outer;
		}
	}

	private class DerComparer : IComparer
	{
		public int Compare(object x, object y)
		{
			byte[] array = (byte[])x;
			byte[] array2 = (byte[])y;
			int num = System.Math.Min(array.Length, array2.Length);
			for (int i = 0; i != num; i++)
			{
				byte b = array[i];
				byte b2 = array2[i];
				if (b != b2)
				{
					if (b >= b2)
					{
						return 1;
					}
					return -1;
				}
			}
			if (array.Length > array2.Length)
			{
				if (!AllZeroesFrom(array, num))
				{
					return 1;
				}
				return 0;
			}
			if (array.Length < array2.Length)
			{
				if (!AllZeroesFrom(array2, num))
				{
					return -1;
				}
				return 0;
			}
			return 0;
		}

		private bool AllZeroesFrom(byte[] bs, int pos)
		{
			while (pos < bs.Length)
			{
				if (bs[pos++] != 0)
				{
					return false;
				}
			}
			return true;
		}
	}

	private readonly IList _set;

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

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

	public virtual int Count => _set.Count;

	public Asn1SetParser Parser => new Asn1SetParserImpl(this);

	public static Asn1Set GetInstance(object obj)
	{
		if (obj == null || obj is Asn1Set)
		{
			return (Asn1Set)obj;
		}
		if (obj is Asn1SetParser)
		{
			return GetInstance(((Asn1SetParser)obj).ToAsn1Object());
		}
		if (obj is byte[])
		{
			try
			{
				return GetInstance(Asn1Object.FromByteArray((byte[])obj));
			}
			catch (IOException ex)
			{
				throw new ArgumentException("failed to construct set from byte[]: " + ex.Message);
			}
		}
		if (obj is Asn1Encodable)
		{
			Asn1Object asn1Object = ((Asn1Encodable)obj).ToAsn1Object();
			if (asn1Object is Asn1Set)
			{
				return (Asn1Set)asn1Object;
			}
		}
		throw new ArgumentException("Unknown object in GetInstance: " + Platform.GetTypeName(obj), "obj");
	}

	public static Asn1Set GetInstance(Asn1TaggedObject obj, bool explicitly)
	{
		Asn1Object asn1Object = obj.GetObject();
		if (explicitly)
		{
			if (!obj.IsExplicit())
			{
				throw new ArgumentException("object implicit - explicit expected.");
			}
			return (Asn1Set)asn1Object;
		}
		if (obj.IsExplicit())
		{
			return new DerSet(asn1Object);
		}
		if (asn1Object is Asn1Set)
		{
			return (Asn1Set)asn1Object;
		}
		if (asn1Object is Asn1Sequence)
		{
			Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector();
			Asn1Sequence asn1Sequence = (Asn1Sequence)asn1Object;
			foreach (Asn1Encodable item in asn1Sequence)
			{
				asn1EncodableVector.Add(item);
			}
			return new DerSet(asn1EncodableVector, needsSorting: false);
		}
		throw new ArgumentException("Unknown object in GetInstance: " + Platform.GetTypeName(obj), "obj");
	}

	protected internal Asn1Set(int capacity)
	{
		_set = Platform.CreateArrayList(capacity);
	}

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

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

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

	public virtual Asn1Encodable[] ToArray()
	{
		Asn1Encodable[] array = new Asn1Encodable[Count];
		for (int i = 0; i < Count; i++)
		{
			array[i] = this[i];
		}
		return array;
	}

	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 Asn1Set asn1Set))
		{
			return false;
		}
		if (Count != asn1Set.Count)
		{
			return false;
		}
		IEnumerator enumerator = GetEnumerator();
		IEnumerator enumerator2 = asn1Set.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 Sort()
	{
		if (_set.Count >= 2)
		{
			Asn1Encodable[] array = new Asn1Encodable[_set.Count];
			byte[][] array2 = new byte[_set.Count][];
			for (int i = 0; i < _set.Count; i++)
			{
				array2[i] = (array[i] = (Asn1Encodable)_set[i]).GetEncoded("DER");
			}
			Array.Sort(array2, array, new DerComparer());
			for (int j = 0; j < _set.Count; j++)
			{
				_set[j] = array[j];
			}
		}
	}

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

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