using System;
using System.Collections;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Math;

namespace Org.BouncyCastle.Asn1.X509.Qualified
{
    /**
    * The MonetaryValue object.
    * <pre>
    * MonetaryValue  ::=  SEQUENCE {
    *       currency              Iso4217CurrencyCode,
    *       amount               INTEGER,
    *       exponent             INTEGER }
    * -- value = amount * 10^exponent
    * </pre>
    */
    public class MonetaryValue
        : Asn1Encodable
    {
        internal Iso4217CurrencyCode	currency;
        internal DerInteger				amount;
        internal DerInteger				exponent;

		public static MonetaryValue GetInstance(
            object obj)
        {
            if (obj == null || obj is MonetaryValue)
            {
                return (MonetaryValue) obj;
            }

			if (obj is Asn1Sequence)
            {
                return new MonetaryValue(Asn1Sequence.GetInstance(obj));
            }

			throw new ArgumentException("unknown object in GetInstance: " + obj.GetType().FullName, "obj");
		}

		private MonetaryValue(
            Asn1Sequence seq)
        {
			if (seq.Count != 3)
				throw new ArgumentException("Bad sequence size: " + seq.Count, "seq");

            currency = Iso4217CurrencyCode.GetInstance(seq[0]);
            amount = DerInteger.GetInstance(seq[1]);
            exponent = DerInteger.GetInstance(seq[2]);
        }

		public MonetaryValue(
            Iso4217CurrencyCode	currency,
            int					amount,
            int					exponent)
        {
            this.currency = currency;
            this.amount = new DerInteger(amount);
            this.exponent = new DerInteger(exponent);
        }

		public Iso4217CurrencyCode Currency
		{
			get { return currency; }
		}

		public BigInteger Amount
		{
			get { return amount.Value; }
		}

		public BigInteger Exponent
		{
			get { return exponent.Value; }
		}

		public override Asn1Object ToAsn1Object()
        {
			return new DerSequence(currency, amount, exponent);
        }
    }
}