from django.db.models.signals import post_save, post_delete
from django.dispatch import receiver
from django.core.mail import send_mail
from django.conf import settings
from django.urls import reverse
from .models import Order, OrderItem, OrderStatus
from django.db import transaction

@receiver([post_save, post_delete], sender=Order)
def send_order_notification(sender, instance, **kwargs):
    print("send_order_notification")
    """
    Send an email notification when an order is created, updated, or deleted.
    """
    # Use transaction.on_commit to ensure database operations are complete
    transaction.on_commit(lambda: _send_order_email(instance, **kwargs))

def _send_order_email(instance, **kwargs):
    created = kwargs.get('created', False)
    update_fields = kwargs.get('update_fields', None)

    # Determine the action type
    if 'signal' in kwargs and kwargs['signal'] == post_delete:
        action = "DELETED"
        return
    elif created:
        action = "CREATED"
        return
    else:
        action = "UPDATED"
        print('updated', update_fields)
        if update_fields and 'status' in update_fields:
            action = "UPDATED"

    # Get order details
    order_id = instance.id
    status = instance.status

    print("status", status)
    if status == OrderStatus.PENDING:
        return

    total_price = instance.total_price

    # Generate admin URL
    admin_url = f"{settings.SITE_URL}{reverse('admin:shop_order_change', args=[order_id])}"

    # Get customer info
    customer_email = None
    if instance.user:
        customer_info = f"Utilisateur: {instance.user.email}"
        customer_email = instance.user.email
    elif instance.guest_user:
        customer_info = f"Invité: {instance.guest_user.email} ({instance.guest_user.phone})"
        customer_email = instance.guest_user.email
    else:
        customer_info = "Client inconnu"

    # Build order item details
    items_list = ""
    if action != "DELETED":
        # Use a fresh query to ensure we have the most recent data
        order_items = OrderItem.objects.filter(order_id=order_id).select_related('product', 'color', 'size')
        for item in order_items:
            color = item.color.name if item.color else "N/A"
            size = item.size.name if item.size else "N/A"
            item_line = f"- {item.quantity}x {item.product.title} (Couleur: {color}, Taille: {size}, Prix: {item.price}€)\n"
            items_list += item_line

    # Compose the email
    if action == "CREATED":
        action_fr = "CRÉÉE"
    elif action == "UPDATED":
        action_fr = "MISE À JOUR"
    elif action == "DELETED":
        action_fr = "SUPPRIMÉE"
    else:
        action_fr = action

    # Translate current status
    status_fr_map = {
        "PENDING": "EN ATTENTE",
        "PAID": "PAYÉE",
        "SHIPPED": "EXPÉDIÉE",
        "DELIVERED": "LIVRÉE",
        "CANCELED": "ANNULÉE"
    }
    status_fr = status_fr_map.get(status, status)

    # Translate payment status
    payment_status_fr_map = {
        "UNPAID": "NON PAYÉE",
        "PAID": "PAYÉE",
        "FAILED": "ÉCHOUÉE"
    }
    payment_status_fr = payment_status_fr_map.get(instance.payment_status, instance.payment_status)

    # Send internal notification email
    subject = f"Commande #{order_id} {action_fr}: {status_fr}"
    message = f"""
La commande #{order_id} a été {action_fr.lower()}

Statut: {status_fr}
Statut de paiement: {payment_status_fr}
Prix total: {total_price}€

{customer_info}

Articles:
{items_list}

Voir la commande dans le panneau d'administration: {admin_url}

Ceci est un message automatique. Merci de ne pas répondre.
    """

    # Send internal email
    recipient_list = [email for name, email in settings.MANAGERS]
    if not recipient_list:
        recipient_list = [settings.DEFAULT_FROM_EMAIL]

    send_mail(
        subject=subject,
        message=message,
        from_email=settings.DEFAULT_FROM_EMAIL,
        recipient_list=recipient_list,
        fail_silently=False,
    )

    # Only send customer email for PAID status and if we have customer email
    if status == OrderStatus.PAID and customer_email and instance.payment_status == "PAID":
        # Generate customer-facing URLs
        shop_url = f"{settings.SITE_URL}/shop"
        contact_email = "support@padelclub.app"

        # Create a customer receipt email
        customer_subject = f"Confirmation de votre commande #{order_id} - PadelClub"
        customer_message = f"""
Bonjour,

Nous vous remercions pour votre commande sur PadelClub !

Récapitulatif de votre commande #{order_id} du {instance.date_ordered.strftime('%d/%m/%Y')} :

Statut: {status_fr}
Prix total: {total_price}€

Détail de votre commande :
{items_list}

Nous nous occupons de préparer votre commande dans les plus brefs délais.

Pour toute question concernant votre commande, n'hésitez pas à contacter notre service client :
{contact_email}

Visitez notre boutique pour découvrir d'autres produits :
{shop_url}

Merci de votre confiance et à bientôt sur PadelClub !

L'équipe PadelClub
        """

        # Send email to customer
        send_mail(
            subject=customer_subject,
            message=customer_message,
            from_email=settings.DEFAULT_FROM_EMAIL,
            recipient_list=[customer_email],
            fail_silently=False,
        )