using Socialize.Api.Infrastructure.Observability;

namespace Socialize.Api.Modules.CalendarIntegrations.Services;

internal sealed class CalendarImportBackgroundService(
    IServiceScopeFactory scopeFactory,
    SocializeMetrics metrics,
    ILogger<CalendarImportBackgroundService> logger)
    : BackgroundService
{
    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        using PeriodicTimer timer = new(TimeSpan.FromHours(6));
        while (!stoppingToken.IsCancellationRequested)
        {
            await RefreshDueSourcesAsync(stoppingToken);
            await timer.WaitForNextTickAsync(stoppingToken);
        }
    }

    private async Task RefreshDueSourcesAsync(CancellationToken stoppingToken)
    {
        try
        {
            using IServiceScope scope = scopeFactory.CreateScope();
            CalendarImportSyncService syncService = scope.ServiceProvider.GetRequiredService<CalendarImportSyncService>();
            await syncService.RefreshDueSourcesAsync(stoppingToken);
            metrics.RecordBackgroundJobRun(nameof(CalendarImportBackgroundService), true);
        }
        catch (OperationCanceledException ex) when (stoppingToken.IsCancellationRequested)
        {
            logger.LogDebug(ex, "Calendar import background sync stopped.");
        }
#pragma warning disable CA1031 // Background service should log and continue after unexpected sync failures.
        catch (Exception ex)
        {
            metrics.RecordBackgroundJobRun(nameof(CalendarImportBackgroundService), false);
            logger.LogError(ex, "Calendar import background sync failed.");
        }
#pragma warning restore CA1031
    }
}