using Api.SeaHavenIndustries.Observability;
using Microsoft.Extensions.Options;
using SeaHaven.Services.Configuration;
using SeaHaven.Services.Interfaces;
using Sentry;

namespace Api.SeaHavenIndustries.HostedServices
{
    public class UpliftLifecycleHostedService : BackgroundService
    {
        private readonly IServiceScopeFactory _scopeFactory;
        private readonly ILogger<UpliftLifecycleHostedService> _logger;
        private readonly ApprovalsOptions _options;
        private readonly IHub _sentryHub;

        public UpliftLifecycleHostedService(
            IServiceScopeFactory scopeFactory,
            IOptions<ApprovalsOptions> options,
            ILogger<UpliftLifecycleHostedService> logger,
            IHub sentryHub)
        {
            _scopeFactory = scopeFactory;
            _logger = logger;
            _options = options.Value;
            _sentryHub = sentryHub;
        }

        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            while (!stoppingToken.IsCancellationRequested)
            {
                {
                    using var transaction = SentryObservability.BeginBackgroundTransaction(
                        _sentryHub,
                        "uplifts.lifecycle-sweep",
                        $"{nameof(UpliftLifecycleHostedService)}.{nameof(SweepAsync)}");
                    try
                    {
                        await SweepAsync(stoppingToken);
                        transaction.FinishOk();
                    }
                    catch (OperationCanceledException)
                    {
                        transaction.FinishCancelled();
                        throw;
                    }
                    catch (Exception ex)
                    {
                        _logger.LogError(ex, "Uplift lifecycle sweep failed; will retry on next interval");
                        transaction.FinishError(ex);
                    }
                }

                await Task.Delay(_options.EffectiveSweepInterval, stoppingToken);
            }
        }

        private async Task SweepAsync(CancellationToken cancellationToken)
        {
            using var scope = _scopeFactory.CreateScope();
            var lifecycle = scope.ServiceProvider.GetRequiredService<IUpliftLifecycleService>();

            await lifecycle.ExpireDueAsync(cancellationToken);
            await lifecycle.SendDueInitialNotificationsAsync(cancellationToken);
            await lifecycle.EscalateDueAsync(cancellationToken);
        }
    }
}