Make the payment group button work

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

registration/views.py

@@ -460,9 +460,10 @@ class PaymentUpdateView(LoginRequiredMixin, UpdateView):
                                                     data=self.request.POST or None,
                                                     instance=self.object)
 
-        context['scholarship_form'] = PaymentForm(payment_type='scholarship',
-                                                  data=self.request.POST or None,
-                                                  instance=self.object)
+        if not self.object.grouped:
+            context['scholarship_form'] = PaymentForm(payment_type='scholarship',
+                                                      data=self.request.POST or None,
+                                                      instance=self.object)
 
         context['other_form'] = PaymentForm(payment_type='other',
                                             data=self.request.POST or None,
@@ -481,6 +482,54 @@ class PaymentUpdateView(LoginRequiredMixin, UpdateView):
         return reverse_lazy("registration:user_detail", args=(self.object.registrations.first().user.pk,))
 
 
+class PaymentUpdateGroupView(LoginRequiredMixin, DetailView):
+    model = Payment
+
+    def dispatch(self, request, *args, **kwargs):
+        if not self.request.user.is_authenticated or \
+                not self.request.user.registration.is_admin \
+                and (self.request.user.registration not in self.get_object().registrations.all()
+                     or self.get_object().valid is not False):
+            return self.handle_no_permission()
+        return super().dispatch(request, *args, **kwargs)
+
+    def get(self, request, *args, **kwargs):
+        payment = self.get_object()
+
+        if payment.valid is not False:
+            raise PermissionDenied(_("This payment is already valid or pending validation."))
+
+        if payment.grouped:
+            registrations = list(payment.registrations.all())
+            first_reg = registrations[0]
+            payment.registrations.set([first_reg])
+            payment.grouped = False
+            tournament = first_reg.team.participation.tournament if not payment.final else Tournament.final_tournament()
+            payment.amount = tournament.price
+            payment.save()
+            for registration in registrations[1:]:
+                p = Payment.objects.create(type=payment.type,
+                                           grouped=False,
+                                           final=payment.final,
+                                           amount=tournament.price,
+                                           receipt=payment.receipt,
+                                           additional_information=payment.additional_information)
+                p.registrations.set([registration])
+                p.save()
+        else:
+            reg = payment.registrations.get()
+            tournament = reg.team.participation.tournament if not payment.final else Tournament.final_tournament()
+            for student in reg.team.students.all():
+                if student != reg:
+                    Payment.objects.filter(registrations=student, final=payment.final).delete()
+                payment.registrations.add(student)
+            payment.amount = tournament.price * reg.team.students.count()
+            payment.grouped = True
+            payment.save()
+
+        return redirect(reverse_lazy("registration:update_payment", args=(payment.pk,)))
+
+
 class PhotoAuthorizationView(LoginRequiredMixin, View):
     """
     Display the sent photo authorization.