using System;

namespace GemCard
{
    /// <summary>
    /// This class is used to update a set of parameters of an APDUCommand object
    /// </summary>
    public class APDUParam
    {
        byte bClass;
        byte bChannel;
        byte bP2;
        byte bP1;

        byte[] baData;
        short nLe;

        bool fUseP1;
        bool fUseP2;
        bool fChannel;
        bool fData;
        bool fClass;
        bool fLe;

        /// <summary>
        /// Resets the current instance, all flags are set to false
        /// </summary>
        public void Reset()
        {
            bClass = 0;
            bChannel = 0;
            bP2 = 0;
            bP1 = 0;

            baData = null;
            nLe = -1;

            fUseP1 = false;
            fUseP2 = false;
            fChannel = false;
            fData = false;
            fClass = false;
            fLe = false;
        }

        #region Constructors

        public APDUParam()
        {
            Reset();
        }

        /// <summary>
        /// Copy constructor (used for cloning)
        /// </summary>
        /// <param name="param"></param>
        public APDUParam(APDUParam param)
        {
            // Copy field
            if (param.baData != null)
            {
                param.baData.CopyTo(baData, 0);
            }

            this.bClass = param.bClass;
            this.bChannel = param.bChannel;
            this.bP1 = param.bP1;
            this.bP2 = param.bP2;
            this.nLe = param.nLe;

            // Copy flags field
            this.fChannel = param.fChannel;
            this.fClass = param.fClass;
            this.fData = param.fData;
            this.fLe = param.fLe;
            this.fUseP1 = param.fUseP1;
            this.fUseP2 = param.fUseP2;
        }

        public APDUParam(byte bClass, byte bP1, byte bP2, byte[] baData, short nLe)
        {
            this.Class = bClass;
            this.P1 = bP1;
            this.P2 = bP2;
            this.Data = baData;
            this.Le = (byte)nLe;
        }

        #endregion

        /// <summary>
        /// Clones the current APDUParam instance
        /// </summary>
        /// <returns></returns>
        public APDUParam Clone()
        {
            return new APDUParam(this);
        }

        #region Properties

        public bool UseClass { get { return fClass; } }
        public bool UseChannel { get { return fChannel; } }
        public bool UseLe { get { return fLe; } }
        public bool UseData { get { return fData; } }
        public bool UseP1 { get { return fUseP1; } }
        public bool UseP2 { get { return fUseP2; } }

        public byte P1
        {
            get { return bP1; }
            set { bP1 = value; fUseP1 = true; }
        }

        public byte P2
        {
            get { return bP2; }
            set { bP2 = value; fUseP2 = true; }
        }

        public byte[] Data
        {
            get { return baData; }
            set { baData = value; fData = true; }
        }

        public byte Le
        {
            get { return (byte)nLe; }
            set { nLe = value; fLe = true; }
        }

        public byte Channel
        {
            get { return bChannel; }
            set { bChannel = value; fChannel = true; }
        }

        public byte Class
        {
            get { return bClass; }
            set { bClass = value; fClass = true; }
        }

        #endregion
    }
}