from django.core.cache import cache
from django.conf import settings
from datetime import datetime, timedelta
 
def site_context(request):
    """Provides global template variables for site-wide data."""
    context = {
        'site_name': getattr(settings, 'SITE_NAME', 'Capypad'),
        'current_year': datetime.now().year,
    }
 
    cached_categories = cache.get('nav_categories')
    if cached_categories is None:
        from .models import Category
        cached_categories = Category.objects.filter(
            is_active=True,
            parent__isnull=True
        ).only('id', 'name', 'slug', 'icon').order_by('sort_order')[:10]
        cache.set('nav_categories', list(cached_categories), 300)
 
    context['nav_categories'] = cached_categories
 
    if request.user.is_authenticated:
        context['user_notifications'] = get_user_notifications(request.user)
        context['cart_item_count'] = get_cart_count(request.user)
 
    return context
 
def get_user_notifications(user, limit=5):
    """Retrieve unread notifications for authenticated user."""
    from .models import Notification
    return list(Notification.objects.filter(
        user=user,
        is_read=False,
        created_at__gte=datetime.now() - timedelta(days=7)
    ).values('id', 'title', 'message', 'notification_type')[:limit])
 
def get_cart_count(user):
    """Get current shopping cart item count."""
    from .models import Cart
    return Cart.objects.filter(user=user, is_active=True).count()