namespace EgwCoreLib.Lux.Data.Services.General
{
    public class StatsCollectService : BackgroundService
    {
        #region Public Constructors

        public StatsCollectService(
            IConfiguration config,
            IServiceScopeFactory scopeFactory,
            ILogger<StatsCollectService> logger)
        {
            _config = config;
            _scopeFactory = scopeFactory;
            _logger = logger;

            _clearProcessed = _config.GetValue<bool>("ServerConf:CleanupProcessed", false);
            _refreshPeriodMinutes = _config.GetValue<int>("ServerConf:RefreshPeriodMinutes", 60);
        }

        #endregion Public Constructors

        #region Protected Methods

        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            _logger.LogInformation("StatsCollectService started. RefreshPeriod={Minutes} clearProcessed={Clear}",
                _refreshPeriodMinutes, _clearProcessed);

            while (!stoppingToken.IsCancellationRequested)
            {
                try
                {
                    // crea uno scope per risolvere servizi scoped (CalcRuidService incluso)
                    await using var scope = _scopeFactory.CreateAsyncScope();
                    var calcRuid = scope.ServiceProvider.GetRequiredService<ICalcRuidService>();

                    // esegui l'operazione; passa lo stoppingToken se il metodo lo supporta
                    await calcRuid.ExportStatsToDbAsync(_clearProcessed);
                }
                catch (OperationCanceledException) when (stoppingToken.IsCancellationRequested)
                {
                    // shutdown in corso: esci pulitamente
                    _logger.LogInformation("StatsCollectService cancellation requested.");
                    break;
                }
                catch (Exception ex)
                {
                    // logga l'errore ma non lasciare che l'host si fermi
                    _logger.LogError(ex, "Errore durante ExportStatsToDbAsync. Il servizio continuerà a riprovare.");
                }

                try
                {
                    await Task.Delay(TimeSpan.FromMinutes(_refreshPeriodMinutes), stoppingToken);
                }
                catch (OperationCanceledException)
                {
                    // shutdown: esci
                    break;
                }
            }

            _logger.LogInformation("StatsCollectService stopping.");
        }

        #endregion Protected Methods

        #region Private Fields

        private readonly bool _clearProcessed;
        private readonly IConfiguration _config;
        private readonly ILogger<StatsCollectService> _logger;
        private readonly int _refreshPeriodMinutes;
        private readonly IServiceScopeFactory _scopeFactory;

        #endregion Private Fields
    }
}