using System;
using System.Globalization;
using Org.BouncyCastle.Utilities;

namespace Org.BouncyCastle.Asn1.Cms;

public class Time : Asn1Encodable, IAsn1Choice
{
	private readonly Asn1Object time;

	public string TimeString
	{
		get
		{
			if (time is DerUtcTime)
			{
				return ((DerUtcTime)time).AdjustedTimeString;
			}
			return ((DerGeneralizedTime)time).GetTime();
		}
	}

	public DateTime Date
	{
		get
		{
			try
			{
				if (time is DerUtcTime)
				{
					return ((DerUtcTime)time).ToAdjustedDateTime();
				}
				return ((DerGeneralizedTime)time).ToDateTime();
			}
			catch (FormatException ex)
			{
				throw new InvalidOperationException("invalid date string: " + ex.Message);
			}
		}
	}

	public static Time GetInstance(Asn1TaggedObject obj, bool explicitly)
	{
		return GetInstance(obj.GetObject());
	}

	public Time(Asn1Object time)
	{
		if (time == null)
		{
			throw new ArgumentNullException("time");
		}
		if (!(time is DerUtcTime) && !(time is DerGeneralizedTime))
		{
			throw new ArgumentException("unknown object passed to Time");
		}
		this.time = time;
	}

	public Time(DateTime date)
	{
		string text = date.ToString("yyyyMMddHHmmss", CultureInfo.InvariantCulture) + "Z";
		int num = int.Parse(text.Substring(0, 4));
		if (num < 1950 || num > 2049)
		{
			time = new DerGeneralizedTime(text);
		}
		else
		{
			time = new DerUtcTime(text.Substring(2));
		}
	}

	public static Time GetInstance(object obj)
	{
		if (obj == null || obj is Time)
		{
			return (Time)obj;
		}
		if (obj is DerUtcTime)
		{
			return new Time((DerUtcTime)obj);
		}
		if (obj is DerGeneralizedTime)
		{
			return new Time((DerGeneralizedTime)obj);
		}
		throw new ArgumentException("unknown object in factory: " + Platform.GetTypeName(obj), "obj");
	}

	public override Asn1Object ToAsn1Object()
	{
		return time;
	}
}