using Microsoft.Extensions.Options;
using SeaHaven.Services.Configuration;
using SeaHaven.Services.Interfaces;

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

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

        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            while (!stoppingToken.IsCancellationRequested)
            {
                try
                {
                    await SweepAsync(stoppingToken);
                }
                catch (OperationCanceledException)
                {
                    throw;
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex, "Uplift lifecycle sweep failed; will retry on next interval");
                }

                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);
        }
    }
}