From bdb55823529cffbbd46b3c524600a8c4c29744e6 Mon Sep 17 00:00:00 2001
From: Gabriel Augendre <gabriel@augendre.info>
Date: Mon, 22 Jan 2018 17:58:51 +0100
Subject: [PATCH] Display the monthly expense in already refunded.

---
 refunding/templates/refunding/elements_list.html |  2 +-
 refunding/views.py                               | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/refunding/templates/refunding/elements_list.html b/refunding/templates/refunding/elements_list.html
index 500524d..81e637f 100644
--- a/refunding/templates/refunding/elements_list.html
+++ b/refunding/templates/refunding/elements_list.html
@@ -1,7 +1,7 @@
 {% if elements %}
     {% if sum %}
         <p>
-            Total : {{ sum|floatformat:-2 }}€
+            Total : {{ sum|floatformat:-2 }}€{% if refunded %} (soit {{ monthly|floatformat:-2 }}€ par mois){% endif %}
         </p>
     {% endif %}
     <div class="list-group">
diff --git a/refunding/views.py b/refunding/views.py
index cc44a6c..74b34c5 100644
--- a/refunding/views.py
+++ b/refunding/views.py
@@ -1,3 +1,5 @@
+import calendar
+
 from django.contrib import messages
 from django.contrib.auth.decorators import login_required, permission_required
 from django.db.models import Sum
@@ -174,9 +176,23 @@ def already_refunded_payments(request):
     else:
         value_sum = 0
 
+    start_date = refunded.last().date
+    start_date = start_date.replace(day=1)
+
+    end_date = refunded.first().date
+    month = end_date.month
+    year = end_date.year + month // 12
+    month = month % 12 + 1
+    end_date = end_date.replace(year=year, month=month, day=1)
+
+    diff = (end_date.year - start_date.year) * 12 + end_date.month - start_date.month
+
+    monthly = value_sum / diff
+
     context = {
         'refunded': refunded,
         'sum': value_sum,
+        'monthly': monthly,
         'default_nothing': 'Aucun paiement remboursé :)'
     }
     return render(request, "refunding/refunded_payments.html", context)