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


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

using Booleans = IReadOnlyCollection<Boolean>;
using MbFc = MbByte<FunctionCode>;

public class WriteCoilsCommandFrame : ModbusFrame
{
    private new const Int32 MinSize = 7;

    private MbWord WriteAddress  => Data.WordAt(2);
    private MbWord NbOfCoils     => Data.WordAt(4);
    private MbByte ByteCount     => Data.ByteAt(6);
    private MbBits CoilsToWrite  => Data.BitsAt(7);

    public WriteCoilsCommandFrame(Byte slave, UInt16 writeAddress, Booleans coils) : base(MinSize + NbBytes(coils))
    {
        if (coils.Count > MaxCoils)
            throw new ArgumentOutOfRangeException($"Maximum number of Coils to write ({MaxCoils}) exceeded!", nameof(coils));

        SlaveAddress.Set(slave);
        FunctionCode.Set(WriteMultipleCoils);
        WriteAddress.Set(writeAddress);
        NbOfCoils   .Set(coils.Count);
        ByteCount   .Set(NbBytes(coils));
        CoilsToWrite.Set(coils);
    }


    private WriteCoilsCommandFrame(ArraySegment<Byte> data) : base(data)
    {
        if (data.Count < MinSize)
            throw new ArgumentOutOfRangeException($"Expecting an array of size {MinSize} or more!", nameof(data));

        AssertFunctionCode(WriteMultipleCoils);

        var expectedSize = ByteCount + MinSize;
        if (data.Count != expectedSize)
            throw new ArgumentException($"Expecting an array of size {expectedSize}", nameof(data));

        if (ByteCount != CoilsToWrite.Count / 8)
            throw new ArgumentException(nameof(CoilsToWrite));
    }


    public WriteCoilsResponseFrame VerifyResponse(WriteCoilsResponseFrame response)
    {
        if (response.SlaveAddress != SlaveAddress)
            throw new UnexpectedResponseFieldException(nameof(response.SlaveAddress), SlaveAddress.ToString(), response.SlaveAddress);

        if (response.NbWritten != NbOfCoils)
            throw new UnexpectedResponseFieldException(nameof(response.NbWritten), NbOfCoils, response.NbWritten);

        if (response.WriteAddress != WriteAddress)
            throw new UnexpectedResponseFieldException(nameof(response.WriteAddress), WriteAddress, response.WriteAddress);

        return response;
    }

    public static WriteCoilsCommandFrame Parse(ArraySegment<Byte> data)
    {
        return new WriteCoilsCommandFrame(data);
    }
    
    private static Int32 NbBytes(Booleans coils)
    {
        return Math.Ceiling(coils.Count / 8.0).ConvertTo<Int32>();
    }


}