using System;
using System.Net;
using System.Threading;
using System.Threading.Tasks;

namespace LanDiscovery.Services
{
    public class NameResolutionService
    {
        private const int MaxConcurrency = 32;

        public async Task<string> ResolveHostnameAsync(string ipAddress)
        {
            if (string.IsNullOrEmpty(ipAddress)) return "";

            try
            {
                // This can be slow, so it should be called concurrently but throttled
                // We'll trust the Orchestrator or UI to not call this 254 times instantly on one thread.
                // Or better, we throttle internally if we were processing a list. 
                // For per-item calls, simple async is fine, the calling side should manage limits.
                
                var entry = await Dns.GetHostEntryAsync(ipAddress);
                return entry.HostName ?? "";
            }
            catch (Exception)
            {
                // DNS resolution failed or timeout
                return "";
            }
        }

        // NetBIOS would go here using UDP 137 queries standard. 
        // For MVP we stick to DNS.
    }
}