# -*- coding: utf-8 -*-
from django.db import models
from django.db.models.signals import post_save, pre_save
from django.dispatch import receiver
from hvad.models import TranslatableModel, TranslatedFields
from bitfield import BitField
# my models
from directories.models import Iata
from service.models import Service
from settings.models import Setting
# custom dunctions
from functions.db import db_table_exists
from functions.form_check import translit_with_separator
from functions.signal_additional_func import fill_missing_languages, fill_meta_information

#check if table exist and create flags if true
flags = [str(item.id) for item in Service.objects.all()] if db_table_exists('service_service') else []


class City(TranslatableModel):
    """
    Create City model

    Uses hvad.TranslatableModel which is child of django.db.models class

    """

    services = BitField(flags=flags)

    url = models.SlugField(unique=True)
    #relations
    country = models.ForeignKey('country.Country', null=True, on_delete=models.PROTECT, related_name='cities')
    code_IATA = models.ForeignKey(Iata, blank=True, null=True)

    population = models.PositiveIntegerField(blank=True, null=True)
    phone_code = models.PositiveIntegerField(blank=True, null=True)
    #translated fields
    translations = TranslatedFields(
        name = models.CharField(max_length=50),
        transport = models.TextField(blank=True),
        description = models.TextField(blank=True),
        famous_places = models.TextField(blank=True),
        shoping = models.TextField(blank=True),
        #-----meta
        title = models.CharField(max_length=255),
        descriptions = models.CharField(max_length=255),
        keywords = models.CharField(max_length=255),
    )
    #fields saves information about creating and changing model
    created = models.DateTimeField(auto_now_add=True)
    modified = models.DateTimeField(auto_now=True)

    def __unicode__(self):
        return self.lazy_translation_getter('name', self.pk)


@receiver(post_save)
def city_post_save_handler(sender, **kwargs):
    """
    objects saves two times:
        - first time Country object
        - second time CountryTranslation object
    object must have at least one Translation
    """

    obj = kwargs['instance']
    if isinstance(obj, City):
        fill_missing_languages(obj)
        fill_meta_information(obj)
    """
    if isinstance(obj, CityTranslation):
    # object is Translation - set url
        if obj.language_code == 'ru':
            city = City.objects.get(id=obj.master_id)
            country = city.country
            city.url = '%s-%s'%(translit_with_separator(country.name), translit_with_separator(obj.name))
            city.save()
    """