using System;
using System.Collections.Generic;
using System.Diagnostics.Metrics;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;

namespace NIFPGA
{
    public sealed class FPGAWriteProperty<T> : FPGABaseProperty
        where T : unmanaged
    {
        private object lockObject = new object();
        internal FPGAWriteProperty(FPGASession session, uint indicator) : base(session, indicator, false)
        {
        }
        private void SetValue(T value)
        {
            lock (lockObject)
            {
                T oldvalue = GetValue();
                if (object.Equals(value, oldvalue)) return;
                switch (value)
                {
                    case Boolean boolvalue:
                        _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_WriteBool>()(_Session.Session, Indicator, Convert.ToByte(boolvalue)));
                        break;
                    case Byte:
                        _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_WriteU8>()(_Session.Session, Indicator, Unsafe.As<T, byte>(ref value)));
                        break;
                    case SByte:
                        _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_WriteI8>()(_Session.Session, Indicator, Unsafe.As<T, sbyte>(ref value)));
                        break;
                    case Int16:
                        _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_WriteI16>()(_Session.Session, Indicator, Unsafe.As<T, short>(ref value)));
                        break;
                    case UInt16:
                        _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_WriteU16>()(_Session.Session, Indicator, Unsafe.As<T, ushort>(ref value)));
                        break;
                    case Int32:
                        _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_WriteI32>()(_Session.Session, Indicator, Unsafe.As<T, int>(ref value)));
                        break;
                    case UInt32:
                        _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_WriteU32>()(_Session.Session, Indicator, Unsafe.As<T, uint>(ref value)));
                        break;
                    case Int64:
                        _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_WriteI64>()(_Session.Session, Indicator, Unsafe.As<T, long>(ref value)));
                        break;
                    case UInt64:
                        _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_WriteU64>()(_Session.Session, Indicator, Unsafe.As<T, ulong>(ref value)));
                        break;
                    case Single:
                        _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_WriteSgl>()(_Session.Session, Indicator, Unsafe.As<T, float>(ref value)));
                        break;
                    case double:
                        _Session.CheckResult(_Session.GetDelegate<Interop.NiFpgaDll_WriteDbl>()(_Session.Session, Indicator, Unsafe.As<T, double>(ref value)));
                        break;
                }
            }
        }
        private T GetValue()
        {
            lock (lockObject)
            {
                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 { get => GetValue(); set => SetValue(value); }
    }
}