from django.contrib.auth.models import User
from django.core.mail import EmailMultiAlternatives
from django.db import models
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.template.loader import render_to_string
from django.utils.translation import gettext_lazy as _

from musicians.models import Musician


class Message(models.Model):
    titel = models.CharField(max_length=100, verbose_name=_("titel"))
    text = models.TextField(blank=False, verbose_name=_("text"))

    creation_time = models.DateTimeField(verbose_name=_("creation_time"))

    author = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name=_("Author"))

    class Meta:
        ordering = ["-creation_time"]

    def __str__(self):
        return self.author.username + " : " + self.titel


@receiver(post_save, sender=Message)
def send_forum_notification(sender, instance, created, **kwargs):
    """Send email notification when a new message is created."""
    if not created:
        return

    receivers = [m.user.email for m in Musician.objects.all() if m.user.email]

    if not receivers:
        return

    subject = "Blechreiz Forum: " + instance.titel
    from_email = "forum@blechreiz.com"

    context = {"messages": Message.objects.all().order_by("-creation_time")[:10]}

    text_content = render_to_string("simpleforum/mail.txt", context)

    msg = EmailMultiAlternatives(subject, text_content, from_email, receivers)
    # Uncomment to add HTML version:
    # html_content = render_to_string("simpleforum/mail.html", context)
    # msg.attach_alternative(html_content, "text/html")

    try:
        msg.send()
    except Exception:
        # Log the error but don't crash
        pass