# -*- coding: utf-8 -*-
from django.db import models
from hvad.models import TranslatableModel, TranslatedFields, TranslationManager
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes import generic
import copy
#functions
from functions.custom_fields import EnumField

class NewsManager(TranslationManager):
    def safe_get(self, **kwargs):
        model = self.model
        try:
            return model.objects.get(**kwargs)
        except:
            return None

TYPES = ('announcement', 'news', 'overview')
class News(TranslatableModel):
    MAX_ON_MAIN_PAGE = 3

    #set manager of this model
    objects = NewsManager()

    content_type = models.ForeignKey(ContentType, null=True)
    object_id = models.PositiveIntegerField(blank=True, null=True)
    object = generic.GenericForeignKey(content_type, object_id)

    url = models.SlugField(unique=True)
    date = models.DateField(verbose_name='Дата')
    type = EnumField(values=TYPES)
    theme = models.ManyToManyField('theme.Theme', verbose_name='Тема')
    tag = models.ManyToManyField('theme.Tag', verbose_name='Теги', blank=True, null=True)
    user = models.ForeignKey('accounts.User', verbose_name='Организатор', blank=True, null=True,
                                  on_delete=models.PROTECT)
    paid = models.BooleanField(default=0)
    
    translations = TranslatedFields(
        main_title = models.CharField(verbose_name='Заголовок', max_length=255),
        preview = models.TextField(verbose_name='Превью'),
        description = models.TextField(verbose_name='Описание'),
        #---meta data
        title = models.CharField(max_length=250, blank=True),
        descriptions = models.CharField(max_length=250, blank=True),
        keywords = models.CharField(max_length=250, blank=True),
    )
    #fields saves information about creating and changing model
    created = models.DateTimeField(auto_now_add=True)
    modified = models.DateTimeField(auto_now=True)

    main_page = models.PositiveIntegerField(default=0, db_index=True)
    views = models.PositiveIntegerField(default=0)

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

    def clone(self):
        """
        Return an identical copy of the instance with a new ID.
        """
        if not self.pk:
            raise ValueError('Instance must be saved before it can be cloned.')

        duplicate = copy.copy(self)
        # Setting pk to None. Django thinking this is a new object.
        duplicate.pk = None
        # url must be unique
        duplicate.url += '_copy'
        if News.objects.safe_get(url=duplicate.url):
            #already has copy this instance
            return

        ignore_fields = ['id', 'master', 'language_code']
        duplicate.translate('ru')
        tr = self._meta.translations_model.objects.get(language_code = 'ru',master__id=self.pk)
        for field in duplicate._translated_field_names:

                if field in ignore_fields:
                    continue

                setattr(duplicate, field, getattr(tr, field))

        duplicate.save()
        # but lost all ManyToMany relations and Translations.

        # copy relations
        for field in self._meta.many_to_many:
            source = getattr(self, field.attname)
            destination = getattr(duplicate, field.attname)
            for item in source.all():
                destination.add(item)

        return duplicate

from django.db.models.signals import post_save
from functions.signal_handlers import post_save_handler

post_save.connect(post_save_handler, sender=News)