# accounts/signals.py
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.db import transaction
from django.utils.text import slugify

from hr.models import Employee
from .models import User


@receiver(post_save, sender=User, dispatch_uid="create_employee_on_user_create_simple")
def create_employee_on_user_create(sender, instance: User, created: bool, **kwargs):
    if not created:
        return

    def _make():
        tenant = getattr(instance, "tenant", None)
        email = (instance.email or "").strip()

        # If already linked OR same email exists in this tenant, skip
        if Employee.objects.filter(user=instance).exists():
            return
        if email and Employee.objects.filter(tenant=tenant, email__iexact=email).exists():
            return

        Employee.objects.create(
            tenant=tenant,
            user=instance,
            first_name=instance.first_name or "",
            last_name=instance.last_name or "",
            email=email,
            # employee_id will be auto-generated in Employee.save()
        )

    transaction.on_commit(_make)