using System;

using Org.BouncyCastle.Utilities.Date;

namespace Org.BouncyCastle.Bcpg.Sig
{
    /**
    * packet giving signature creation time.
    */
    public class SignatureCreationTime
        : SignatureSubpacket
    {
		protected static byte[] TimeToBytes(
            DateTime time)
        {
			long t = DateTimeUtilities.DateTimeToUnixMs(time) / 1000L;
			byte[] data = new byte[4];
			data[0] = (byte)(t >> 24);
            data[1] = (byte)(t >> 16);
            data[2] = (byte)(t >> 8);
            data[3] = (byte)t;
            return data;
        }

        public SignatureCreationTime(
            bool    critical,
            bool    isLongLength,
            byte[]  data)
            : base(SignatureSubpacketTag.CreationTime, critical, isLongLength, data)
        {
        }

        public SignatureCreationTime(
            bool        critical,
            DateTime    date)
            : base(SignatureSubpacketTag.CreationTime, critical, false, TimeToBytes(date))
        {
        }

        public DateTime GetTime()
        {
			long time = (long)(
					((uint)data[0] << 24)
				|	((uint)data[1] << 16)
				|	((uint)data[2] << 8)
				|	((uint)data[3])
				);
			return DateTimeUtilities.UnixMsToDateTime(time * 1000L);
        }
    }
}