namespace MusicBridge.Agent.Network;

// Data for a future DNS-SD publisher. Does not open sockets or advertise pairing secrets.
internal sealed record DiscoveryDescriptor(int ProtocolVersion, string AgentId, string ServiceType, string InstanceName)
{
    public static DiscoveryDescriptor Create(string certificateSha256)
    {
        if (certificateSha256.Length != 64 || !certificateSha256.All(Uri.IsHexDigit))
            throw new ArgumentException("Неверный идентификатор сертификата.");
        var id = certificateSha256.ToUpperInvariant();
        return new(1, id, "_musicbridge._tcp.local.", "MusicBridge-" + id[..12]);
    }

    public IReadOnlyDictionary<string, string> TxtRecords() => new Dictionary<string, string>
    {
        ["v"] = ProtocolVersion.ToString(System.Globalization.CultureInfo.InvariantCulture),
        ["id"] = AgentId
    };
}