Allow to redeem a voucher for an existing cart (#1517)

* Allow to redeem a voucher for an existing cart

* Bundle behaviour

src/pretix/presale/templates/pretixpresale/event/fragment_cart.html

@@ -246,11 +246,31 @@
     <div class="product">
         <strong>{% trans "Total" %}</strong>
     </div>
-    <div class="count hidden-xs">
+    <div class="count hidden-xs hidden-sm">
         <strong>{{ cart.itemcount }}</strong>
     </div>
     <div class="col-md-3 col-xs-6 col-md-offset-3 price">
         <strong>{{ cart.total|money:event.currency }}</strong>
+
+        {% if editable and show_vouchers and not cart.all_with_voucher %}
+            <br>
+            <a class="js-only apply-voucher-toggle" href="#">
+                <span class="fa fa-tag"></span> {% trans "Redeem a voucher" %}
+            </a>
+            <form action="{% eventurl event "presale:event.cart.voucher" cart_namespace=cart_namespace|default_if_none:"" %}"
+                  data-asynctask-headline="{% trans "We're applying this voucher to your cart..." %}"
+                  method="post" data-asynctask class="apply-voucher">
+                {% csrf_token %}
+                <div class="input-group">
+                    <input type="text" class="form-control" name="voucher" placeholder="{% trans "Voucher code" %}">
+                    <span class="input-group-btn">
+                        <button class="btn btn-primary" type="submit">
+                            <span class="fa fa-check"></span>
+                        </button>
+                    </span>
+                </div>
+            </form>
+        {% endif %}
     </div>
     <div class="clearfix"></div>
 </div>

src/pretix/presale/urls.py

@@ -18,6 +18,7 @@ import pretix.presale.views.widget
 
 frame_wrapped_urls = [
     url(r'^cart/remove$', pretix.presale.views.cart.CartRemove.as_view(), name='event.cart.remove'),
+    url(r'^cart/voucher$', pretix.presale.views.cart.CartApplyVoucher.as_view(), name='event.cart.voucher'),
     url(r'^cart/clear$', pretix.presale.views.cart.CartClear.as_view(), name='event.cart.clear'),
     url(r'^cart/answer/(?P<answer>[^/]+)/$',
         pretix.presale.views.cart.AnswerDownload.as_view(),

src/pretix/presale/views/__init__.py

@@ -164,6 +164,7 @@ class CartMixin:
 
         return {
             'positions': positions,
+            'all_with_voucher': all(p.voucher_id for p in positions),
             'raw': cartpos,
             'total': total,
             'net_total': net_total,

src/pretix/presale/views/cart.py

@@ -23,7 +23,8 @@ from pretix.base.models import (
     CartPosition, InvoiceAddress, QuestionAnswer, SubEvent, Voucher,
 )
 from pretix.base.services.cart import (
-    CartError, add_items_to_cart, clear_cart, remove_cart_position,
+    CartError, add_items_to_cart, apply_voucher, clear_cart,
+    remove_cart_position,
 )
 from pretix.base.views.tasks import AsyncAction
 from pretix.multidomain.urlreverse import eventreverse
@@ -327,6 +328,26 @@ def cart_session(request):
     return request.session['carts'][cart_id]
 
 
+@method_decorator(allow_frame_if_namespaced, 'dispatch')
+class CartApplyVoucher(EventViewMixin, CartActionMixin, AsyncAction, View):
+    task = apply_voucher
+    known_errortypes = ['CartError']
+
+    def get_success_message(self, value):
+        return _('We applied the voucher to as many products in your cart as we could.')
+
+    def post(self, request, *args, **kwargs):
+        if 'voucher' in request.POST:
+            return self.do(self.request.event.id, request.POST.get('voucher'), get_or_create_cart_id(self.request), translation.get_language())
+        else:
+            if 'ajax' in self.request.GET or 'ajax' in self.request.POST:
+                return JsonResponse({
+                    'redirect': self.get_error_url()
+                })
+            else:
+                return redirect(self.get_error_url())
+
+
 @method_decorator(allow_frame_if_namespaced, 'dispatch')
 class CartRemove(EventViewMixin, CartActionMixin, AsyncAction, View):
     task = remove_cart_position