using DigitalData.MessagingService.Application.Common.Interfaces;
using DigitalData.MessagingService.Infrastructure.Queue;
using DigitalData.MessagingService.RabbitMQ;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace DigitalData.MessagingService.Infrastructure.Services.Background;

/// <summary>
/// A hosted background service responsible for initializing the outgoing email queue consumer.
/// Leverages a push-based, event-driven RabbitMQ consumer to eliminate polling overhead.
/// Email account configuration is resolved exclusively from application settings; no database access is performed.
/// </summary>
public class AsyncInitWorker(OutgoingEmailConsumer EmailConsumer, IOutgoingEmailPublisher EmailPublisher, RabbitMqConnectionFactory CnnFactory) : BackgroundService
{
    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        // Initialize the RabbitMQ push-based consumer. This call is non-blocking;
        // message processing is handled asynchronously via registered event callbacks.
        await CnnFactory.InitAsync(stoppingToken);

        await EmailConsumer.InitAsync();

        if (EmailPublisher is OutgoingEmailPublisher emailPublisher)
            await emailPublisher.InitAsync();
    }
}