namespace PrivaPub.Domain.Social
{
	// sends again, now and then, the follow requests still unanswered (FollowService.ResendPending)
	public sealed class FollowResender(IServiceScopeFactory scopes, ILogger<FollowResender> logger) : BackgroundService
	{
		static readonly TimeSpan Every = TimeSpan.FromMinutes(15);

		protected override async Task ExecuteAsync(CancellationToken token)
		{
			using var timer = new PeriodicTimer(Every);
			while (await timer.WaitForNextTickAsync(token))
			{
				try
				{
					using var scope = scopes.CreateScope();
					var sent = await scope.ServiceProvider.GetRequiredService<IFollowService>().ResendPending(DateTime.UtcNow, token);
					if (sent > 0)
						logger.LogInformation("Sent {Count} unanswered follow requests again", sent);
				}
				catch (Exception ex) when (ex is not OperationCanceledException)
				{
					logger.LogWarning(ex, "Unanswered follow requests could not be sent again");
				}
			}
		}
	}
}