2 files changed, 27 insertions, 2 deletions
diff --git a/app/income/admin.py b/app/income/admin.py
index 6399463..b165371 100644
--- a/app/income/admin.py
+++ b/app/income/admin.py
@@ -16,7 +16,7 @@ class InvoiceItemAdmin(admin.ModelAdmin):
 
 @admin.register(Invoice)
 class InvoiceAdmin(admin.ModelAdmin):
-    list_display = ('title', 'date_start', 'date_end')
+    list_display = ('title', 'admin_link', 'date_start', 'date_end')
 
 
 @admin.register(Gig)
diff --git a/app/income/models.py b/app/income/models.py
index 77a6d24..688d1d7 100644
--- a/app/income/models.py
+++ b/app/income/models.py
@@ -1,6 +1,9 @@
 import datetime
+from datetime import timedelta
 from django.db import models
 from django.utils import timezone
+from django.urls import reverse
+from django.utils.html import format_html
 
 from resume.models import PubItem, Publisher
 
@@ -49,12 +52,17 @@ class Gig(models.Model):
 
 class Invoice(models.Model):
     title = models.CharField(max_length=200)
+    slug = models.SlugField()
     date_start = models.DateField(null=True, blank=True)
     date_end = models.DateField(null=True, blank=True)
 
     def __str__(self):
         return self.title
 
+    def admin_link(self):
+        return format_html('<a href="/admin/income/invoice/monthlyview/%s/">View Invoice</a>' % (self.slug))
+    admin_link.short_description = 'Invoice'
+
 
 class InvoiceItem(models.Model):
     time_start = models.DateTimeField(null=True, blank=True)
@@ -62,8 +70,25 @@ class InvoiceItem(models.Model):
     work_done = models.TextField(null=True, blank=True)
 
     def __str__(self):
-        return self.time_start
+        return str(self.time_start)
 
     @property
     def total(self):
         return self.time_end - self.time_start
+
+    @property
+    def rounded_total(self):
+        """
+        Rounds the given timedelta by the given timedelta period
+        :param td: `timedelta` to round
+        :param period: `timedelta` period to round by.
+        """
+        period = timedelta(minutes=15)
+        td = self.total
+        period_seconds = period.total_seconds()
+        half_period_seconds = period_seconds / 2
+        remainder = td.total_seconds() % period_seconds
+        if remainder >= half_period_seconds:
+            return timedelta(seconds=td.total_seconds() + (period_seconds - remainder))
+        else:
+            return timedelta(seconds=td.total_seconds() - remainder)