Added overview and export written off orders

alexia/apps/billing/urls.py

@@ -5,6 +5,7 @@
 urlpatterns = [
     url(r'^order/$', views.OrderListView.as_view(), name='orders'),
     url(r'^order/(?P<pk>[0-9]+)/$', views.OrderDetailView.as_view(), name='event-orders'),
+    url(r'^order/writeoff/(?P<pk>[0-9]+)/$', views.WriteOffExportView.as_view(), name='writeoff_export'),
     url(r'^order/export/$', views.OrderExportView.as_view(), name='export-orders'),
     url(r'^stats/(?P<year>[0-9]{4})/$', views.OrderYearView.as_view(), name='year-orders'),
     url(r'^stats/(?P<year>[0-9]{4})/(?P<month>[0-9]{1,2})/$', views.OrderMonthView.as_view(), name='month-orders'),

alexia/apps/billing/views.py

@@ -1,13 +1,15 @@
 from django.conf import settings
 from django.contrib.auth.mixins import LoginRequiredMixin
 from django.core.exceptions import PermissionDenied
+from django.core import serializers
 from django.db.models import Count, Sum
 from django.db.models.functions import ExtractYear, TruncMonth
-from django.http import Http404, HttpResponseRedirect
+from django.http import Http404, JsonResponse, HttpResponseRedirect
 from django.shortcuts import get_object_or_404, render
 from django.urls import reverse, reverse_lazy
 from django.utils.dates import MONTHS
 from django.utils.translation import ugettext as _
+from django.views import View
 from django.views.generic.base import RedirectView, TemplateView
 from django.views.generic.detail import DetailView, SingleObjectMixin
 from django.views.generic.edit import (
@@ -33,8 +35,9 @@
     OrganizationFilterMixin, OrganizationFormMixin,
 )
 
-from .models import Order, Purchase, WriteoffCategory
-
+from .models import Order, Purchase, WriteOffPurchase, WriteoffCategory
+from alexia.utils.writeoff import get_writeoff_products
+import json
 
 class JulianaView(TenderRequiredMixin, DetailView):
     template_name = 'billing/juliana.html'
@@ -128,14 +131,38 @@ def get_context_data(self, **kwargs):
             .values('product') \
             .annotate(amount=Sum('amount'), price=Sum('price'))
 
+        writeoff_exists = self.object.writeoff_orders.exists
+
+        if writeoff_exists:
+            grouped_writeoff_products = get_writeoff_products(self.object, WriteOffPurchase.objects)
+
         context = super(OrderDetailView, self).get_context_data(**kwargs)
         context.update({
             'orders': self.object.orders.select_related('authorization__user').order_by('-placed_at'),
             'products': products,
             'revenue': products.aggregate(Sum('price'))['price__sum'],
+            'writeoff_exists': writeoff_exists,
+            'grouped_writeoff_data': grouped_writeoff_products
         })
+
         return context
 
+class WriteOffExportView(ManagerRequiredMixin, DenyWrongOrganizationMixin, View):
+    organization_field = 'organizer'
+
+    # get event
+    def get(self, request, *args, **kwargs):
+        event_pk = kwargs.get('pk')  # Extract the pk from kwargs
+        event = get_object_or_404(Event, pk=event_pk)  # Fetch the Event or raise 404 if not found
+
+        writeoff_exists = event.writeoff_orders.exists
+
+        if not writeoff_exists:
+            raise Http404
+
+        grouped_writeoff_products = get_writeoff_products(event, WriteOffPurchase.objects)
+
+        return JsonResponse(grouped_writeoff_products)
 
 class OrderExportView(ManagerRequiredMixin, FormView):
     template_name = 'billing/order_export_form.html'

alexia/utils/writeoff.py

@@ -0,0 +1,21 @@
+from collections import defaultdict
+from django.db.models import Sum
+
+def get_writeoff_products(event, writeoff_purchases):
+    writeoff_products = writeoff_purchases.filter(order__event=event) \
+        .values('order__writeoff_category__name', 'product') \
+        .annotate(total_amount=Sum('amount'), total_price=Sum('price')) \
+        .order_by('order__writeoff_category__name', 'product')
+
+    # Group writeoffs by category
+    grouped_writeoff_products = defaultdict(lambda: {'products': [], 'total_amount': 0, 'total_price': 0})
+
+    # calculate total product amount and total price per category
+    for product in writeoff_products:
+        category_name = product['order__writeoff_category__name']
+        grouped_writeoff_products[category_name]['products'].append(product)
+        grouped_writeoff_products[category_name]['total_amount'] += product['total_amount']
+        grouped_writeoff_products[category_name]['total_price'] += product['total_price']
+
+    # Convert defaultdict to a regular dict for easier template use
+    return dict(grouped_writeoff_products)