"""News app models."""
from django.contrib.contenttypes import fields as generic
from django.db import models
from django.utils import timezone
from django.utils.translation import gettext_lazy as _
from rest_framework.reverse import reverse

from utils.models import BaseAttributes, TJSONField, TranslatedFieldsMixin


class NewsType(models.Model):
    """NewsType model."""

    name = models.CharField(_('name'), max_length=250)

    class Meta:
        """Meta class."""

        verbose_name_plural = _('news types')
        verbose_name = _('news type')

    def __str__(self):
        """Overrided __str__ method."""
        return self.name


class NewsQuerySet(models.QuerySet):
    """QuerySet for model News"""

    def by_type(self, news_type):
        """Filter News by type"""
        return self.filter(news_type__name=news_type)

    def by_country_code(self, code):
        """Filter collection by country code."""
        return self.filter(country__code=code)

    def published(self):
        """Return only published news"""
        now = timezone.now()
        return self.filter(models.Q(models.Q(end__gte=now) |
                                    models.Q(end__isnull=True)),
                           is_publish=True, start__lte=now)

    def with_related(self):
        """Return qs with related objects."""
        return self.select_related('news_type', 'country').prefetch_related('tags')


class News(BaseAttributes, TranslatedFieldsMixin):
    """News model."""

    news_type = models.ForeignKey(NewsType, on_delete=models.PROTECT,
                                  verbose_name=_('news type'))
    title = TJSONField(blank=True, null=True, default=None,
                       verbose_name=_('title'),
                       help_text='{"en-GB":"some text"}')
    subtitle = TJSONField(blank=True, null=True, default=None,
                          verbose_name=_('subtitle'),
                          help_text='{"en-GB":"some text"}')
    description = TJSONField(blank=True, null=True, default=None,
                             verbose_name=_('description'),
                             help_text='{"en-GB":"some text"}')
    start = models.DateTimeField(verbose_name=_('Start'))
    end = models.DateTimeField(blank=True, null=True, default=None,
                               verbose_name=_('End'))
    slug = models.SlugField(unique=True, max_length=50, null=True,
                            verbose_name=_('News slug'), editable=True,)
    playlist = models.IntegerField(_('playlist'))
    is_publish = models.BooleanField(default=False,
                                     verbose_name=_('Publish status'))
    author = models.CharField(max_length=255, blank=True, null=True,
                              default=None,verbose_name=_('Author'))
    is_highlighted = models.BooleanField(default=False,
                                         verbose_name=_('Is highlighted'))
    # TODO: metadata_keys - описание ключей для динамического построения полей метаданных
    # TODO: metadata_values - Описание значений для динамических полей из MetadataKeys
    address = models.ForeignKey('location.Address', blank=True, null=True,
                                default=None, verbose_name=_('address'),
                                on_delete=models.SET_NULL)
    country = models.ForeignKey('location.Country', blank=True, null=True,
                                on_delete=models.SET_NULL,
                                verbose_name=_('country'))
    tags = generic.GenericRelation(to='main.MetaDataContent')

    gallery = models.ManyToManyField('gallery.Image', through='news.NewsGallery')

    objects = NewsQuerySet.as_manager()

    class Meta:
        """Meta class."""

        verbose_name = _('news')
        verbose_name_plural = _('news')

    def __str__(self):
        return f'news: {self.slug}'

    @property
    def web_url(self):
        return reverse('web:news:rud', kwargs={'slug': self.slug})


class NewsGalleryQuerySet(models.QuerySet):
    """QuerySet for model News"""

    def originals(self):
        """Return QuerySet with original images."""
        return self.filter(gallery__parent__isnull=True)

    def crops(self):
        """Return QuerySet with cropped images."""
        return self.filter(gallery__parent__isnull=False)


class NewsGallery(models.Model):

    news = models.ForeignKey(News, null=True,
                             related_name='news_gallery',
                             on_delete=models.SET_NULL,
                             verbose_name=_('news'))
    image = models.ForeignKey('gallery.Image', null=True,
                              related_name='news_gallery',
                              on_delete=models.SET_NULL,
                              verbose_name=_('gallery'))

    objects = NewsGalleryQuerySet.as_manager()

    class Meta:
        """NewsGallery meta class."""
        verbose_name = _('news gallery')
        verbose_name_plural = _('news galleries')