Refactor email templates and add notification tasks

Moved email templates to a unified 'email' directory and added new base, header, and footer templates for emails. Implemented notification tasks in commerce for various order and refund events, and updated Carrier model to trigger notifications on shipping state changes.

backend/commerce/tasks.py

@@ -1,4 +1,8 @@
 from .models import Order
+from account.models import User
+from account.tasks import send_email_with_context
+from celery import shared_task
+
 from django.utils import timezone
 
 def delete_expired_orders():
@@ -8,3 +12,132 @@ def delete_expired_orders():
     return count
 
 
+# -- NOTIFICATIONS CARRIER --
+
+# Zásilkovna
+@shared_task
+def notify_zasilkovna_sended(order:Order = None, user:User = None, **kwargs):
+    if not order or not user:
+        raise ValueError("Order and User must be provided for notification.")
+    
+    if kwargs:
+        print("Additional kwargs received in notify_order_sended:", kwargs)
+    
+    send_email_with_context(
+        user.email,
+        subject="Your order has been shipped",
+        template_name="emails/order_sended.txt",
+        html_template_name="emails/order_sended.html",
+        context={
+            "user": user,
+            "order": order,
+        })
+    
+    pass
+
+# Shop
+@shared_task
+def notify_Ready_to_pickup(order:Order = None, user:User = None, **kwargs):
+    if not order or not user:
+        raise ValueError("Order and User must be provided for notification.")
+    
+    if kwargs:
+        print("Additional kwargs received in notify_order_sended:", kwargs)
+    
+    send_email_with_context(
+        user.email,
+        subject="Your order has been shipped",
+        template_name="emails/order_sended.txt",
+        html_template_name="emails/order_sended.html",
+        context={
+            "user": user,
+            "order": order,
+        })
+    
+    pass
+
+
+# -- NOTIFICATIONS ORDER --
+
+@shared_task
+def notify_order_successfuly_created(order:Order = None, user:User = None, **kwargs):
+    if not order or not user:
+        raise ValueError("Order and User must be provided for notification.")
+    
+    if kwargs:
+        print("Additional kwargs received in notify_order_successfuly_created:", kwargs)
+    
+    send_email_with_context(
+        user.email,
+        subject="Your order has been successfully created",
+        template_name="emails/order_created.txt",
+        html_template_name="emails/order_created.html",
+        context={
+            "user": user,
+            "order": order,
+        })
+    
+    pass
+
+
+@shared_task
+def notify_about_missing_payment(order:Order = None, user:User = None, **kwargs):
+    if not order or not user:
+        raise ValueError("Order and User must be provided for notification.")
+    
+    if kwargs:
+        print("Additional kwargs received in notify_about_missing_payment:", kwargs)
+    
+    send_email_with_context(
+        user.email,
+        subject="Payment missing for your order",
+        template_name="emails/order_missing_payment.txt",
+        html_template_name="emails/order_missing_payment.html",
+        context={
+            "user": user,
+            "order": order,
+        })
+    
+    pass
+
+
+def notify_refund_items_arrived(order:Order = None, user:User = None, **kwargs):
+    if not order or not user:
+        raise ValueError("Order and User must be provided for notification.")
+    
+    if kwargs:
+        print("Additional kwargs received in notify_refund_items_arrived:", kwargs)
+    
+    send_email_with_context(
+        user.email,
+        subject="Your refund items have arrived",
+        template_name="emails/order_refund_items_arrived.txt",
+        html_template_name="emails/order_refund_items_arrived.html",
+        context={
+            "user": user,
+            "order": order,
+        })
+    
+    pass
+
+
+# Refund accepted, retuning money
+@shared_task
+def notify_refund_accepted(order:Order = None, user:User = None, **kwargs):
+    if not order or not user:
+        raise ValueError("Order and User must be provided for notification.")
+    
+    if kwargs:
+        print("Additional kwargs received in notify_refund_accepted:", kwargs)
+    
+    send_email_with_context(
+        user.email,
+        subject="Your refund has been accepted",
+        template_name="emails/order_refund_accepted.txt",
+        html_template_name="emails/order_refund_accepted.html",
+        context={
+            "user": user,
+            "order": order,
+        })
+    
+    pass