from django.db.models.signals import post_save
from django.dispatch import receiver

from apps.course.models import Course
from apps.chat.models import RoomMessage


@receiver(post_save, sender=Course)
def handle_room_message_for_course(sender, instance, created, **kwargs):
    if created:  # فقط برای موارد جدید اجرا شود
        RoomMessage.objects.create(
            name=f"{instance.title} - Group",
            description=f"Group chat for course: {instance.title}",
            initiator=instance.professor,  # استاد به‌عنوان سازنده اتاق
            course=instance,
            room_type=RoomMessage.RoomTypeChoices.GROUP
        )
    else:  # این بخش در زمان آپدیت دوره اجرا می‌شود
        # Find the existing group room for this course and update its details
        RoomMessage.objects.filter(
            course=instance, 
            room_type=RoomMessage.RoomTypeChoices.GROUP
        ).update(
            name=f"{instance.title} - Group",
            description=f"Group chat for course: {instance.title}",
            initiator=instance.professor
        )


@receiver(post_save, sender=Course)
def ensure_professor_role(sender, instance, **kwargs):
    professor = getattr(instance, 'professor', None)
    if professor:
        professor.ensure_professor_profile()