Display number of available reward points on staff page (e-valuation#…

…1941)

* Display number of available reward points on staff page

* Update evap/rewards/templates/rewards_reward_point_redemption_events.html

---------

Co-authored-by: Niklas Mohrin <dev@niklasmohrin.de>

evap/rewards/templates/rewards_reward_point_redemption_events.html

@@ -7,10 +7,14 @@
 
 {% block content %}
     {{ block.super }}
-
-    <p>
-        <a href="{% url 'rewards:reward_point_redemption_event_create' %}" class="btn btn-dark btn-sm">{% trans 'Create new event' %}</a>
-    </p>
+    <div class="row mb-2">
+        <div class="col">
+            <a href="{% url 'rewards:reward_point_redemption_event_create' %}" class="btn btn-dark btn-sm">{% trans 'Create new event' %}</a>
+        </div>
+        <div class="col text-end">
+            {% trans 'Available reward points' %}: {{ total_points_available }}
+        </div>
+    </div>
 
     <div class="card card-outline-primary mb-3">
         {% trans 'Upcoming events' as title %}

evap/rewards/views.py

@@ -2,6 +2,7 @@
 
 from django.contrib import messages
 from django.core.exceptions import BadRequest, SuspiciousOperation
+from django.db.models import Sum
 from django.http import HttpResponse
 from django.shortcuts import get_object_or_404, redirect, render
 from django.utils.translation import get_language
@@ -91,7 +92,14 @@ def index(request):
 def reward_point_redemption_events(request):
     upcoming_events = RewardPointRedemptionEvent.objects.filter(redeem_end_date__gte=datetime.now()).order_by("date")
     past_events = RewardPointRedemptionEvent.objects.filter(redeem_end_date__lt=datetime.now()).order_by("-date")
-    template_data = {"upcoming_events": upcoming_events, "past_events": past_events}
+    total_points_granted = RewardPointGranting.objects.aggregate(Sum("value"))["value__sum"] or 0
+    total_points_redeemed = RewardPointRedemption.objects.aggregate(Sum("value"))["value__sum"] or 0
+    total_points_available = total_points_granted - total_points_redeemed
+    template_data = {
+        "upcoming_events": upcoming_events,
+        "past_events": past_events,
+        "total_points_available": total_points_available,
+    }
     return render(request, "rewards_reward_point_redemption_events.html", template_data)