using System.Runtime.CompilerServices;

namespace NIFPGA
{
    public sealed class FPGAReadProperty<T> : FPGABaseProperty
        where T : unmanaged
    {
        internal FPGAReadProperty(FPGASession session, uint indicator) : base(session, indicator, true)
        {
        }
        private T GetValue()
        {
            T value = default;
            switch (value)
            {
                case Boolean:
                    _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_ReadBool>()(_Session.Session, Indicator, ref Unsafe.As<T, byte>(ref value)));
                    break;
                case Byte:
                    _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_ReadU8>()(_Session.Session, Indicator, ref Unsafe.As<T, byte>(ref value)));
                    break;
                case SByte:
                    _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_ReadI8>()(_Session.Session, Indicator, ref Unsafe.As<T, sbyte>(ref value)));
                    break;
                case Int16:
                    _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_ReadI16>()(_Session.Session, Indicator, ref Unsafe.As<T, short>(ref value)));
                    break;
                case UInt16:
                    _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_ReadU16>()(_Session.Session, Indicator, ref Unsafe.As<T, ushort>(ref value)));
                    break;
                case Int32:
                    _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_ReadI32>()(_Session.Session, Indicator, ref Unsafe.As<T, int>(ref value)));
                    break;
                case UInt32:
                    _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_ReadU32>()(_Session.Session, Indicator, ref Unsafe.As<T, uint>(ref value)));
                    break;
                case Int64:
                    _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_ReadI64>()(_Session.Session, Indicator, ref Unsafe.As<T, long>(ref value)));
                    break;
                case UInt64:
                    _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_ReadU64>()(_Session.Session, Indicator, ref Unsafe.As<T, ulong>(ref value)));
                    break;
                case Single:
                    _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_ReadSgl>()(_Session.Session, Indicator, ref Unsafe.As<T, float>(ref value)));
                    break;
                case double:
                    _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_ReadDbl>()(_Session.Session, Indicator, ref Unsafe.As<T, double>(ref value)));
                    break;
            }
            return value;
        }
        public T Value => GetValue();
    }
}