using System.Text;

namespace Sick.ColaB.Commands;

/// <summary>
/// Command to write a value to the scanner (sWN - Write by Name)
/// </summary>
public sealed class WriteCommand(string variableName, string value) : CommandBase($"sWN {variableName} {value}")
{
    public string VariableName { get; } = variableName;
    public string Value { get; } = value;

    public override bool ProcessReply(ReadOnlyMemory<byte> replyData)
    {
        // Parse reply: "sWA <variableName>" (Write Acknowledge), "sEA <eventName> <value>" (Event Acknowledge), "sAN <methodName> <result>" (Answer), or "sFA <errorCode>" (Error)
        var replyString = Encoding.ASCII.GetString(replyData.Span);
        
        // Check if reply starts with "sFA" (Error) - this indicates command failed
        if (replyString.StartsWith("sFA", StringComparison.Ordinal))
        {
            // Extract error code if present
            var parts = replyString.Split(' ', StringSplitOptions.RemoveEmptyEntries);
            var errorInfo = parts.Length > 1 ? $" (error code: {string.Join(" ", parts.Skip(1))})" : "";
            WasSuccessful = false;
            return false;
        }

        // Check if reply starts with "sWA" (Write Acknowledge), "sEA" (Event Acknowledge), or "sAN" (Answer)
        if (replyString.StartsWith("sWA", StringComparison.Ordinal) ||
            replyString.StartsWith("sEA", StringComparison.Ordinal) ||
            replyString.StartsWith("sAN", StringComparison.Ordinal))
        {
            WasSuccessful = true;
            return true;
        }

        WasSuccessful = false;
        return false;
    }
}