import random
import string
from django.db.models.fields.files import FieldFile
from signal_additional_func import fill_missing_languages
from functions.form_check import translit_with_separator


def pre_save_handler(sender, **kwargs):
    obj = kwargs['instance']
    url = getattr(obj, 'url')

    if url:
        return

    if hasattr(obj, 'language_code') and obj.language_code =='en':
        try:
            name = getattr(obj, 'name')
            obj.url = translit_with_separator(name)
        except AttributeError:
            pass


    if not obj.url:
        obj.url = ''.join([random.choice(string.ascii_lowercase) for n in xrange(8)])


def post_save_handler(sender, **kwargs):
    """
    receiver function
    take object
    fill missing languages
    fill settings if its exist for this object

    """
    obj = kwargs['instance']
    fill_missing_languages(obj)


def file_cleanup(sender, instance, *args, **kwargs):
    """
    Deletes the file(s) associated with a model instance. The model
    is not saved after deletion of the file(s) since this is meant
    to be used with the pre_delete signal.
    """
    for field_name, _ in instance.__dict__.iteritems():
        field = getattr(instance, field_name)
        if issubclass(field.__class__, FieldFile) and field.name:
            field.delete(save=False)