using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;

namespace StellaOps.Scanner.Worker.Processing;

public sealed class NullScanJobSource : IScanJobSource
{
    private readonly ILogger<NullScanJobSource> _logger;
    private int _logged;

    public NullScanJobSource(ILogger<NullScanJobSource> logger)
    {
        _logger = logger;
    }

    public Task<IScanJobLease?> TryAcquireAsync(CancellationToken cancellationToken)
    {
        if (Interlocked.Exchange(ref _logged, 1) == 0)
        {
            _logger.LogWarning("No queue provider registered. Scanner worker will idle until a queue adapter is configured.");
        }

        return Task.FromResult<IScanJobLease?>(null);
    }
}