using InnovEnergy.Lib.Protocols.Modbus.Protocol.Frames.Accessors;
using static InnovEnergy.Lib.Protocols.Modbus.Protocol.FunctionCode;

namespace InnovEnergy.Lib.Protocols.Modbus.Protocol.Frames.Replies;

internal class WriteRegistersResponseFrame : ModbusFrame
{
    private const Int32 Size = 6;

    public MbWord WriteAddress => Data.WordAt(2);
    public MbWord NbWritten    => Data.WordAt(4);

    internal static Int32 ExpectedSize() => Size;

    public WriteRegistersResponseFrame(Byte slave, UInt16 writeAddress, UInt16 nbWritten) : base(Size)
    {
        SlaveAddress.Set(slave);
        FunctionCode.Set(WriteMultipleRegisters);
        WriteAddress.Set(writeAddress);
        NbWritten   .Set(nbWritten);
    }


    private WriteRegistersResponseFrame(Byte[] data) : this (new ArraySegment<Byte>(data) )
    { }


    private WriteRegistersResponseFrame(ArraySegment<Byte> data) : base(data)
    {
        if (data.Count != Size)
            throw new ArgumentException($"Expecting an array of size {Size}", nameof(data));

        AssertFunctionCode(WriteMultipleRegisters);
    }

    public static WriteRegistersResponseFrame Parse(ArraySegment<Byte> data) => new WriteRegistersResponseFrame(data);
    public static WriteRegistersResponseFrame Parse(Byte[] data)             => new WriteRegistersResponseFrame(data);
    public static WriteRegistersResponseFrame Parse(ModbusFrame frame)       => new WriteRegistersResponseFrame(frame.Data);
}