using InnovEnergy.Lib.Protocols.Modbus.Protocol;
using static System.AttributeTargets;

namespace InnovEnergy.Lib.Protocols.Modbus.Reflection.Attributes;

[AttributeUsage(Field | Property)]
public abstract class ModbusAttribute : Attribute
{
    public UInt16     Address    { get; }
    public UInt16     Size       { get; }
    public Type       ModbusType { get; }
    public ModbusKind Kind       { get; }

    protected ModbusAttribute(UInt16 address, UInt16 size, Type modbusType, ModbusKind kind)
    {
        Address    = address;
        Size       = size;
        ModbusType = modbusType;
        Kind       = kind;
    }

    protected ModbusAttribute(UInt16 address, Type modbusType, ModbusKind kind) : this(address, GetSize(modbusType), modbusType, kind)
    {
    }

    private static UInt16 GetSize(Type modbusType)
    {
        if (!TypeToSize.TryGetValue(modbusType, out var size))
            throw new ArgumentException("cannot infer size of" + nameof(modbusType), nameof(modbusType));

        return size;
    }


    private static readonly Dictionary<Type, UInt16> TypeToSize = new()
    {
        [typeof(Boolean)] = 1,
        [typeof(Int16)]   = 1,
        [typeof(UInt16)]  = 1,
        [typeof(Int32)]   = 2,
        [typeof(UInt32)]  = 2,
        [typeof(Single)]  = 2,
        [typeof(Int64)]   = 4,
        [typeof(UInt64)]  = 4,
        [typeof(Double)]  = 4,
    };
}