using Sick.SafetyScanners.DataStructures;
using Sick.SafetyScanners.Helpers;

namespace Sick.SafetyScanners.DataProcessing;

/// <summary>
/// Parser for RequiredUserAction response from COLA2 variable command
/// Thread-safe implementation
/// </summary>
public sealed class ParseRequiredUserAction
{
    /// <summary>
    /// Parses the required user action from a TCP sequence (COLA2 response)
    /// Matches: ParseRequiredUserActionData::parseTCPSequence in C++
    /// </summary>
    public RequiredUserAction ParseTcpSequence(PacketBuffer buffer)
    {
        var span = buffer.GetBufferSpan();
        return ReadRequiredUserAction(span);
    }
    
    /// <summary>
    /// Matches: ParseRequiredUserActionData::readRequiredUserAction in C++
    /// </summary>
    private RequiredUserAction ReadRequiredUserAction(ReadOnlySpan<byte> span)
    {
        ushort word = ReadWriteHelper.ReadUint16LittleEndian(span, 0);
        
        return new RequiredUserAction
        {
            ConfirmConfiguration = (word & (0x01 << 0)) != 0,
            CheckConfiguration = (word & (0x01 << 1)) != 0,
            CheckEnvironment = (word & (0x01 << 2)) != 0,
            CheckApplicationInterfaces = (word & (0x01 << 3)) != 0,
            CheckDevice = (word & (0x01 << 4)) != 0,
            RunSetupProcedure = (word & (0x01 << 5)) != 0,
            CheckFirmware = (word & (0x01 << 6)) != 0,
            Wait = (word & (0x01 << 7)) != 0
        };
    }
}