using FxpConvert.Common;

namespace NIFPGA
{
    public sealed class FPGAArrayFXPReadProperty : FPGABaseProperty
    {
        Interop.NiFpgaDll_ReadArrayU8 Read;
        private NiFpga_FxpTypeInfo _TypeInfo;
        private IFxpConvert _Convert;
        private byte[] tempbuffer = new byte[0];
        private ulong[] tempvalue = new ulong[0];
        private double[] doubles = new double[0];
        internal FPGAArrayFXPReadProperty(FPGASession session, uint indicator, uint count, NiFpga_FxpTypeInfo typeInfo, IFxpConvert convert) : base(session, indicator, true)
        {
            _Convert = convert;
            Count = count;
            tempvalue = new ulong[count];
            doubles = new double[count];
            _TypeInfo = typeInfo;
            tempbuffer = new byte[(int)Math.Ceiling(typeInfo.wordLength * count / 8.0)];
            Read = _Session.GetDelegate<Interop.NiFpgaDll_ReadArrayU8>();
        }

        private double[] GetData()
        {
            _Session.CheckResult(Read(_Session.Session, Indicator, ref tempbuffer[0], (uint)tempbuffer.Length));
            string s = string.Empty;
            for (int i = 0; i < tempbuffer.Length; i++)
            {
                s += tempbuffer[i].ToString("b").PadLeft(8, '0');
            }
            for (int i = 0; i < tempvalue.Length; i++)
            {
                tempvalue[i] = System.Convert.ToUInt64(s.Substring(i * _TypeInfo.wordLength, _TypeInfo.wordLength), 2);
            }

            _Convert.FxpConvertToDouble(ref tempvalue[0], _TypeInfo, ref doubles[0], Count);
            return doubles;
        }
        public uint Count { get; }
        public double[] Value { get => GetData(); }
    }
}