using System.Runtime.CompilerServices;

namespace NIFPGA
{
    public sealed class FPGAArrayWriteProperty<T> : FPGABaseProperty
    where T : unmanaged
    {
        private delegate NiFpga_Status NiFpgaDll_Delegate(uint session, uint indicator, ref T array, [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.U4)] uint size);
        NiFpgaDll_Delegate Read;
        NiFpgaDll_Delegate Write;
        private T[] tempvalue = new T[0];
        internal FPGAArrayWriteProperty(FPGASession session, uint indicator,uint count) : base(session, indicator,false)
        {
            Count= count;
            tempvalue = new T[Count];
            switch (tempvalue[0])
            {
                case (bool):
                    Read = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_ReadArrayBool).Name);
                    Write = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_WriteArrayBool).Name);
                    break;
                case (byte):
                    Read = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_ReadArrayU8).Name);
                    Write = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_WriteArrayU8).Name);
                    break;
                case (sbyte):
                    Read = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_ReadArrayI8).Name);
                    Write = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_WriteArrayI8).Name);
                    break;
                case short:
                    Read = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_ReadArrayI16).Name);
                    Write = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_WriteArrayI16).Name);
                    break;
                case (ushort):
                    Read = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_ReadArrayU16).Name);
                    Write = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_WriteArrayU16).Name);
                    break;
                case (int):
                    Read = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_ReadArrayI32).Name);
                    Write = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_WriteArrayI32).Name);
                    break;
                case (uint):
                    Read = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_ReadArrayU32).Name);
                    Write = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_WriteArrayU32).Name);
                    break;
                case (long):
                    Read = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_ReadArrayI64).Name);
                    Write = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_WriteArrayI64).Name);
                    break;
                case (ulong):
                    Read = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_ReadArrayU64).Name);
                    Write = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_WriteArrayU64).Name);
                    break;
                case (float):
                    Read = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_ReadArraySgl).Name);
                    Write = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_WriteArraySgl).Name);
                    break;
                case (double):
                    Read = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_ReadArrayDbl).Name);
                    Write = _Session.GetDelegate<NiFpgaDll_Delegate>(typeof(Interop.NiFpgaDll_WriteArrayDbl).Name);
                    break;
            }
        }

        private T[] GetValues()
        {
            if (Count == 0) return tempvalue;
            _Session.CheckResult(Read(_Session.Session, Indicator, ref tempvalue[0], Count));
            return tempvalue;
        }
        private void SetValue(T[] values)
        {
            if (values.Length != Count) return;
            _Session.CheckResult(Write(_Session.Session, Indicator, ref values[0], Count));
        }
        public uint Count { get; }
        public T[] Values { get => GetValues(); set => SetValue(value); }
    }
}