from datetime import datetime
from smtplib import SMTPException

from celery import shared_task
from django.conf import settings
from django.core.mail import send_mail
from django.core.validators import EMPTY_VALUES
from django.template.loader import get_template, render_to_string

from main.models import SiteSettings
from news import models
from notification.models import Subscribe


@shared_task
def send_email_with_news(news_ids):
    subscribes = Subscribe.objects.all() \
        .prefetch_related('subscriber') \
        .prefetch_related('subscription_type')
    sent_news = models.News.objects.filter(id__in=news_ids)

    html_template = get_template(settings.NEWS_EMAIL_TEMPLATE)
    year = datetime.now().year

    socials = list(SiteSettings.objects.with_country().select_related('country'))
    socials = dict(zip(map(lambda social: social.country.code, socials), socials))

    for subscribe in subscribes.filter(unsubscribe_date=None):
        subscriber = subscribe.subscriber

        country = subscribe.subscription_type.country

        if country is None:
            country_code = subscriber.country_code

        else:
            country_code = country.code

        socials_for_subscriber = socials.get(country_code)

        try:
            for new in sent_news:
                if new.country.code != country_code:
                    continue

                context = {
                    "title": new.title.get(subscriber.locale),
                    "subtitle": new.subtitle.get(subscriber.locale),
                    "description": new.description.get(subscriber.locale),
                    "code": subscriber.update_code,
                    "image_url": new.image_url if new.image_url not in EMPTY_VALUES else None,
                    "domain_uri": settings.DOMAIN_URI,
                    "slug": new.slugs.get(subscriber.locale),
                    "country_code": subscriber.country_code,
                    "twitter_page_url": socials_for_subscriber.twitter_page_url if socials_for_subscriber else '#',
                    "instagram_page_url": socials_for_subscriber.instagram_page_url if socials_for_subscriber else '#',
                    "facebook_page_url": socials_for_subscriber.facebook_page_url if socials_for_subscriber else '#',
                    "send_to": subscriber.send_to,
                    "year": year
                }
                send_mail(
                    subject="G&M News",
                    message=render_to_string(settings.NEWS_EMAIL_TEMPLATE, context),
                    from_email=settings.EMAIL_HOST_USER,
                    recipient_list=[subscriber.send_to],
                    fail_silently=False,
                    html_message=html_template.render(context)
                )
        except SMTPException:
            continue