PlcSimulatorProtocol.cs

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using System.Globalization;
 
namespace Dreamine.PLC.Core.Simulation;

public static class PlcSimulatorProtocol
{
    public const string ReadBits = "READ_BITS";

    public const string ReadWords = "READ_WORDS";

    public const string WriteBits = "WRITE_BITS";

    public const string WriteWords = "WRITE_WORDS";

    public static string Ok(string? payload = null)
    {
        return string.IsNullOrWhiteSpace(payload) ? "OK" : $"OK {payload}";
    }

    public static string Error(string message)
    {
        return $"ERR {message.Replace('\r', ' ').Replace('\n', ' ')}";
    }

    public static string FormatBits(IEnumerable<bool> values)
    {
        return string.Join(',', values.Select(x => x ? "1" : "0"));
    }

    public static string FormatWords(IEnumerable<short> values)
    {
        return string.Join(',', values.Select(x => x.ToString(CultureInfo.InvariantCulture)));
    }

    public static bool[] ParseBits(string payload)
    {
        return SplitValues(payload)
            .Select(ParseBit)
            .ToArray();
    }

    public static short[] ParseWords(string payload)
    {
        return SplitValues(payload)
            .Select(x => short.Parse(x, CultureInfo.InvariantCulture))
            .ToArray();
    }

    public static string ReadOkPayload(string line)
    {
        if (line.StartsWith("OK", StringComparison.OrdinalIgnoreCase))
        {
            return line.Length > 2 ? line[3..].Trim() : string.Empty;
        }
 
        if (line.StartsWith("ERR", StringComparison.OrdinalIgnoreCase))
        {
            var message = line.Length > 3 ? line[4..].Trim() : "PLC simulator error.";
            throw new InvalidOperationException(message);
        }
 
        throw new InvalidOperationException($"Invalid PLC simulator response: {line}");
    }

    private static string[] SplitValues(string payload)
    {
        return payload.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
    }

    private static bool ParseBit(string text)
    {
        return text switch
        {
            "1" => true,
            "0" => false,
            _ when bool.TryParse(text, out var value) => value,
            _ => throw new FormatException($"Invalid bit value: {text}")
        };
    }
}