Allow to create a new gift card when refunding

src/pretix/base/payment.py

@@ -1149,7 +1149,7 @@ class GiftCardPayment(BasePaymentProvider):
     @transaction.atomic()
     def execute_refund(self, refund: OrderRefund):
         from .models import GiftCard
-        gc = GiftCard.objects.get(pk=refund.payment.info_data.get('gift_card'))
+        gc = GiftCard.objects.get(pk=refund.info_data.get('gift_card') or refund.payment.info_data.get('gift_card'))
         trans = gc.transactions.create(
             value=refund.amount,
             order=refund.order,

src/pretix/control/templates/pretixcontrol/order/refund_choose.html

@@ -83,6 +83,27 @@
                                    value="" title="" class="form-control">
                         </td>
 
+                    </tr>
+                    <tr>
+                        <td></td>
+                        <td></td>
+                        <td>
+                            <strong>{% trans "Create a new gift card" %}</strong>
+                        </td>
+                        <td></td>
+                        <td>
+                            <div class="input-group">
+                                <input type="text" name="refund-new-giftcard"
+                                       title="" class="form-control" value="{{ 0|floatformat:2 }}">
+                                <span class="input-group-addon">
+                                    {{ request.event.currency }}
+                                </span>
+                            </div>
+                            <div class="text-muted">
+                                {% trans "The gift card can be used to buy tickets for all events of this organizer." %}
+                            </div>
+                        </td>
+
                     </tr>
                     <tr>
                         <td></td>

src/pretix/control/views/orders.py

@@ -5,6 +5,7 @@ import os
 import re
 from datetime import datetime, time, timedelta
 from decimal import Decimal, DecimalException
+from urllib.parse import urlencode
 
 import vat_moss.id
 from django.conf import settings
@@ -709,6 +710,33 @@ class OrderRefundView(OrderView):
                         provider='manual'
                     ))
 
+            giftcard_value = self.request.POST.get('refund-new-giftcard', '0') or '0'
+            giftcard_value = formats.sanitize_separators(giftcard_value)
+            try:
+                giftcard_value = Decimal(giftcard_value)
+            except (DecimalException, TypeError):
+                messages.error(self.request, _('You entered an invalid number.'))
+                is_valid = False
+            else:
+                if giftcard_value:
+                    refund_selected += giftcard_value
+                    giftcard = self.request.organizer.issued_gift_cards.create(
+                        currency=self.request.event.currency,
+                        testmode=self.order.testmode
+                    )
+                    refunds.append(OrderRefund(
+                        order=self.order,
+                        payment=None,
+                        source=OrderRefund.REFUND_SOURCE_ADMIN,
+                        state=OrderRefund.REFUND_STATE_CREATED,
+                        execution_date=now(),
+                        amount=giftcard_value,
+                        provider='giftcard',
+                        info=json.dumps({
+                            'gift_card': giftcard.pk
+                        })
+                    ))
+
             offsetting_value = self.request.POST.get('refund-offsetting', '0') or '0'
             offsetting_value = formats.sanitize_separators(offsetting_value)
             try:
@@ -779,7 +807,7 @@ class OrderRefundView(OrderView):
                         'local_id': r.local_id,
                         'provider': r.provider,
                     }, user=self.request.user)
-                    if r.payment or r.provider == "offsetting":
+                    if r.payment or r.provider == "offsetting" or r.provider == "giftcard":
                         try:
                             r.payment_provider.execute_refund(r)
                         except PaymentException as e:
@@ -816,6 +844,23 @@ class OrderRefundView(OrderView):
                             )
                             self.order.save(update_fields=['status', 'expires'])
 
+                    if giftcard_value and self.order.email:
+                        messages.success(self.request, _('A new gift card was created. You can now send the user their '
+                                                         'gift card code.'))
+                        return redirect(reverse('control:event.order.sendmail', kwargs={
+                            'event': self.request.event.slug,
+                            'organizer': self.request.event.organizer.slug,
+                            'code': self.order.code
+                        }) + '?' + urlencode({
+                            'subject': _('Your gift card code'),
+                            'message': _('Hello,\n\nwe have refunded you {amount} for your order.\n\nYou can use the gift '
+                                         'card code {giftcard} to pay for future ticket purchases in our shop.\n\n'
+                                         'Your {event} team').format(
+                                event="{event}",
+                                amount=money_filter(giftcard_value, self.request.event.currency),
+                                giftcard=giftcard.secret,
+                            )
+                        }))
                 return redirect(self.get_order_url())
             else:
                 messages.error(self.request, _('The refunds you selected do not match the selected total refund '
@@ -1563,6 +1608,11 @@ class OrderSendMail(EventPermissionRequiredMixin, OrderViewMixin, FormView):
             event=self.request.event,
             code=self.kwargs['code'].upper()
         )
+        kwargs['initial'] = {}
+        if self.request.GET.get('subject'):
+            kwargs['initial']['subject'] = self.request.GET.get('subject')
+        if self.request.GET.get('message'):
+            kwargs['initial']['message'] = self.request.GET.get('message')
         return kwargs
 
     def form_invalid(self, form):

src/pretix/control/views/organizer.py

@@ -932,7 +932,7 @@ class GiftCardListView(OrganizerDetailViewMixin, OrganizerPermissionRequiredMixi
 
     def get_queryset(self):
         qs = self.request.organizer.issued_gift_cards.annotate(
-            cached_value=Sum('transactions__value')
+            cached_value=Coalesce(Sum('transactions__value'), Decimal('0.00'))
         )
         if self.filter_form.is_valid():
             qs = self.filter_form.filter_qs(qs)

src/tests/control/test_orders.py

@@ -12,8 +12,9 @@ from tests.base import SoupTest
 from tests.plugins.stripe.test_provider import MockedCharge
 
 from pretix.base.models import (
-    Event, InvoiceAddress, Item, Order, OrderFee, OrderPayment, OrderPosition,
-    OrderRefund, Organizer, Question, QuestionAnswer, Quota, Team, User,
+    Event, GiftCard, InvoiceAddress, Item, Order, OrderFee, OrderPayment,
+    OrderPosition, OrderRefund, Organizer, Question, QuestionAnswer, Quota,
+    Team, User,
 )
 from pretix.base.payment import PaymentException
 from pretix.base.services.invoices import (
@@ -2046,6 +2047,34 @@ def test_refund_paid_order_offsetting(client, env):
         assert p2.state == OrderPayment.PAYMENT_STATE_CONFIRMED
 
 
+@pytest.mark.django_db
+def test_refund_paid_order_giftcard(client, env):
+    with scopes_disabled():
+        p = env[2].payments.last()
+        p.confirm()
+        client.login(email='dummy@dummy.dummy', password='dummy')
+
+    client.post('/control/event/dummy/dummy/orders/FOO/refund', {
+        'start-partial_amount': '5.00',
+        'start-mode': 'partial',
+        'start-action': 'mark_pending',
+        'refund-new-giftcard': '5.00',
+        'manual_state': 'pending',
+        'perform': 'on'
+    }, follow=True)
+    p.refresh_from_db()
+    assert p.state == OrderPayment.PAYMENT_STATE_CONFIRMED
+    env[2].refresh_from_db()
+    with scopes_disabled():
+        r = env[2].refunds.last()
+        assert r.provider == "giftcard"
+        assert r.state == OrderRefund.REFUND_STATE_DONE
+        assert r.amount == Decimal('5.00')
+        assert env[2].status == Order.STATUS_PENDING
+        gk = GiftCard.objects.get(pk=r.info_data['gift_card'])
+        assert gk.value == Decimal('5.00')
+
+
 @pytest.mark.django_db
 def test_refund_list(client, env):
     with scopes_disabled():