feat: use invoices to repeat payments

This properly updates package prices.

weblate_web/invoices/models.py

@@ -474,10 +474,10 @@ def generate_pdf(self) -> None:
             font_config=font_config,
         )
 
-    def finalize(
+    def duplicate(
         self,
         *,
-        kind: InvoiceKind = InvoiceKind.INVOICE,
+        kind: InvoiceKind,
         prepaid: bool = True,
     ) -> Invoice:
         """Create a final invoice from draft/proforma upon payment."""
@@ -499,6 +499,7 @@ def finalize(
                 quantity=item.quantity,
                 quantity_unit=item.quantity_unit,
                 unit_price=item.unit_price,
+                package=item.package,
             )
         return invoice
 

weblate_web/management/commands/recurring_payments.py

@@ -26,6 +26,7 @@
 from django.core.management.base import BaseCommand
 from django.utils import timezone
 
+from weblate_web.invoices.models import InvoiceKind
 from weblate_web.models import Donation, Service, Subscription
 from weblate_web.payments.models import Payment
 from weblate_web.payments.utils import send_notification
@@ -138,7 +139,11 @@ def peform_payment(payment, past_payments, amount: int | None = None):
             return
 
         # Create repeated payment
-        repeated = payment.repeat_payment(amount=amount)
+        if payment.paid_invoice:
+            invoice = payment.paid_invoice.duplicate(kind=InvoiceKind.DRAFT)
+            repeated = invoice.create_payment(payment.recurring)
+        else:
+            repeated = payment.repeat_payment(amount=amount)
 
         # Backend does not support it
         if not repeated:

weblate_web/payments/backends.py

@@ -178,7 +178,7 @@ def generate_invoice(self, *, proforma: bool = False) -> None:
             if proforma and self.payment.draft_invoice.kind == invoice_kind:
                 return
             # Finalize draft if present
-            invoice = self.payment.draft_invoice.finalize(
+            invoice = self.payment.draft_invoice.duplicate(
                 kind=invoice_kind,
                 prepaid=not proforma,
             )