from django.conf import settings
from django.core.mail import EmailMultiAlternatives
from django.template.loader import render_to_string

def send_notification_email(user, subject, template_txt, context, template_html=None):
    """
    Versendet nur, wenn EMAIL_ENABLED=True und user.email vorhanden.
    template_txt: Pfad zu Plaintext-Template
    template_html: optional Pfad zu HTML-Template
    """
    if not settings.EMAIL_ENABLED:
        return False
    if not user or not user.email:
        return False

    subject_full = f"{settings.EMAIL_SUBJECT_PREFIX}{subject}"
    body_txt = render_to_string(template_txt, context)

    msg = EmailMultiAlternatives(
        subject=subject_full,
        body=body_txt,
        from_email=settings.DEFAULT_FROM_EMAIL,
        to=[user.email],
    )
    if template_html:
        body_html = render_to_string(template_html, context)
        msg.attach_alternative(body_html, "text/html")

    msg.send(fail_silently=False)
    return True