import logging

from rq import get_current_job


logger = logging.getLogger(__name__)


def send_event_invitations(event_id, initiated_by_id=None):
    from app import create_app
    app = create_app()
    with app.app_context():
        return send_event_invitations_in_context(event_id, initiated_by_id)


def send_event_invitations_in_context(event_id, initiated_by_id=None):
    from app import db
    from app.models import AuditLog, Event, Guest, User
    from app.services.email_service import send_invitation
    from app.services.qr_service import generate_qr_for_guest

    event = db.session.get(Event, event_id)
    if not event:
        raise RuntimeError(f"Мероприятие {event_id} не найдено")
    guests = Guest.query.filter_by(event_id=event.id, is_active=True, invitation_sent=False).order_by(Guest.id).all()
    total = len(guests)
    sent = failed = 0
    job = get_current_job()
    for processed, guest in enumerate(guests, start=1):
        if not guest.qr_filename:
            generate_qr_for_guest(guest)
        try:
            send_invitation(guest)
            sent += 1
        except Exception as exc:
            failed += 1
            logger.warning("Invitation delivery failed for guest %s: %s", guest.id, exc)
        db.session.commit()
        if job:
            job.meta.update({"event_id": event.id, "total": total, "processed": processed, "sent": sent, "failed": failed})
            job.save_meta()
    initiator = db.session.get(User, initiated_by_id) if initiated_by_id else None
    db.session.add(AuditLog(
        user_id=initiator.id if initiator else None,
        username=initiator.username if initiator else "system",
        action="event_send_invitations", target_type="event", target_id=str(event.id),
        details=f"Фоновая рассылка завершена: отправлено {sent}, ошибок {failed}",
    ))
    db.session.commit()
    return {"event_id": event.id, "total": total, "sent": sent, "failed": failed}