from background_task import background
from django.conf import settings
from celery import shared_task
from django.core.mail import send_mail
from django.template.loader import render_to_string
from django.utils.html import strip_tags
from django.contrib.auth import get_user_model
import logging


logger = logging.getLogger(__name__)
User = get_user_model()

@background(schedule=0)
def send_order_notification_background(order_id):
    """Асинхронная отправка уведомлений о заказе через background-tasks."""
    from .utils.email_notifications import send_order_notification
    from products.models import Order
    try:
        order = Order.objects.select_related('product', 'configuration').get(id=order_id)
        success = send_order_notification(order)
        if success:
            order.notification_sent = True
            order.save(update_fields=['notification_sent'])
        return success
    except Order.DoesNotExist:
        logger.error(f"Order #{order_id} not found")
        return False

@background(schedule=0)
def send_multiple_order_notifications_background(order_ids):
    """Отправка уведомлений для нескольких заказов."""
    from .utils.email_notifications import send_multiple_order_notifications
    from products.models import Order
    orders = Order.objects.filter(id__in=order_ids)
    return send_multiple_order_notifications(orders)

try:
    from celery import shared_task
except ImportError:
    shared_task = None

if shared_task is not None:
    @shared_task
    def send_order_notification_celery(order_id):
        from .utils.email_notifications import send_order_notification
        from products.models import Order
        try:
            order = Order.objects.select_related('product', 'configuration').get(id=order_id)
            success = send_order_notification(order)
            if success:
                order.notification_sent = True
                order.save(update_fields=['notification_sent'])
            return success
        except Order.DoesNotExist:
            return False

    @shared_task
    def send_multiple_order_notifications_celery(order_ids):
        from .utils.email_notifications import send_multiple_order_notifications
        from products.models import Order
        orders = Order.objects.filter(id__in=order_ids)
        return send_multiple_order_notifications(orders)
    

@shared_task
def send_new_article_notification(article_id):
    """Отправка уведомлений подписчикам о новой статье."""
    from blog.models import Article
    from programmer.models import Profile

    try:
        article = Article.objects.select_related('category', 'author').get(id=article_id, is_published=True)
    except Article.DoesNotExist:
        logger.error(f"Article #{article_id} not found or not published")
        return

    # Получаем email-адреса пользователей, подписанных на новые статьи
    profiles = Profile.objects.filter(notify_new_articles=True, user__is_active=True)
    emails = [p.user.email for p in profiles if p.user.email]

    if not emails:
        logger.info(f"No subscribers for new articles, skipping notification for article #{article_id}")
        return

    subject = f'📰 Новая статья: {article.title}'
    context = {
        'article': article,
        'site_url': settings.ALLOWED_HOSTS[0] if settings.ALLOWED_HOSTS else 'localhost',
        'site_name': 'С.Н.А. Технологии',
    }
    html_message = render_to_string('emails/new_article_notification.html', context)
    plain_message = strip_tags(html_message)

    try:
        send_mail(
            subject=subject,
            message=plain_message,
            from_email=settings.DEFAULT_FROM_EMAIL,
            recipient_list=emails,
            html_message=html_message,
            fail_silently=False,
        )
        logger.info(f"New article notification sent to {len(emails)} subscribers for article #{article_id}")
    except Exception as e:
        logger.error(f"Failed to send new article notification for article #{article_id}: {e}")


@shared_task
def send_new_product_notification(product_id):
    """Отправка уведомлений подписчикам о новом продукте."""
    from products.models import Product
    from programmer.models import Profile

    try:
        product = Product.objects.select_related('category').get(id=product_id, is_published=True)
    except Product.DoesNotExist:
        logger.error(f"Product #{product_id} not found or not published")
        return

    profiles = Profile.objects.filter(notify_new_products=True, user__is_active=True)
    emails = [p.user.email for p in profiles if p.user.email]

    if not emails:
        logger.info(f"No subscribers for new products, skipping notification for product #{product_id}")
        return

    subject = f'🛒 Новый продукт: {product.title}'
    context = {
        'product': product,
        'site_url': settings.ALLOWED_HOSTS[0] if settings.ALLOWED_HOSTS else 'localhost',
        'site_name': 'С.Н.А. Технологии',
    }
    html_message = render_to_string('emails/new_product_notification.html', context)
    plain_message = strip_tags(html_message)

    try:
        send_mail(
            subject=subject,
            message=plain_message,
            from_email=settings.DEFAULT_FROM_EMAIL,
            recipient_list=emails,
            html_message=html_message,
            fail_silently=False,
        )
        logger.info(f"New product notification sent to {len(emails)} subscribers for product #{product_id}")
    except Exception as e:
        logger.error(f"Failed to send new product notification for product #{product_id}: {e}")