from django.contrib.auth.models import Permission, Group, User
from ruamel.yaml import YAML
from pathlib import Path
import sys

file = Path('/opt/netbox/initializers/groups.yml')
if not file.is_file():
  sys.exit()

with file.open('r') as stream:
  yaml=YAML(typ='safe')
  groups = yaml.load(stream)

  if groups is not None:
    for groupname, group_details in groups.items():
      group, created = Group.objects.get_or_create(name=groupname)

      if created:
        print("👥 Created group", groupname)

      for username in group_details.get('users', []):
        user = User.objects.get(username=username)

        if user:
          user.groups.add(group)

      yaml_permissions = group_details.get('permissions', [])
      if yaml_permissions:
        subject = group.permissions
        subject.clear()
        for yaml_permission in yaml_permissions:
          if '*' in yaml_permission:
            permission_filter = '^' + yaml_permission.replace('*','.*') + '$'
            permissions = Permission.objects.filter(codename__iregex=permission_filter)
            print("  ⚿ Granting", permissions.count(), "permissions matching '" + yaml_permission + "'")
          else:
            permissions = Permission.objects.filter(codename=yaml_permission)
            print("  ⚿ Granting permission", yaml_permission)

          for permission in permissions:
            subject.add(permission)