1 files changed, 37 insertions, 1 deletions
diff --git a/pharos-dashboard/dashboard/models.py b/pharos-dashboard/dashboard/models.py
index d645cd5..734da38 100644
--- a/pharos-dashboard/dashboard/models.py
+++ b/pharos-dashboard/dashboard/models.py
@@ -1,3 +1,6 @@
+from datetime import timedelta
+
+from django.utils import timezone
 from django.contrib.auth.models import User
 from django.db import models
 
@@ -9,9 +12,42 @@ class Resource(models.Model):
     name = models.CharField(max_length=100, unique=True)
     description = models.CharField(max_length=300, blank=True, null=True)
     url = models.CharField(max_length=100, blank=True, null=True)
-    owner = models.ForeignKey(User)
+    owner = models.ForeignKey(User, related_name='user_lab_owner', null=True)
+    vpn_users = models.ManyToManyField(User, related_name='user_vpn_users')
     slave = models.ForeignKey(JenkinsSlave, on_delete=models.DO_NOTHING, null=True)
 
+    def get_booking_utilization(self, weeks):
+        """
+        Return a dictionary containing the count of booked and free seconds for a resource in the
+        range [now,now + weeks] if weeks is positive,
+        or [now-weeks, now] if weeks is negative
+        """
+
+        length = timedelta(weeks=abs(weeks))
+        now = timezone.now()
+
+        start = now
+        end = now + length
+        if weeks < 0:
+            start = now - length
+            end = now
+
+        bookings = self.booking_set.filter(start__lt=start + length, end__gt=start)
+
+        booked_seconds = 0
+        for booking in bookings:
+            booking_start = booking.start
+            booking_end = booking.end
+            if booking_start < start:
+                booking_start = start
+            if booking_end > end:
+                booking_end = start + length
+            total = booking_end - booking_start
+            booked_seconds += total.total_seconds()
+
+        return {'booked_seconds': booked_seconds,
+                'available_seconds': length.total_seconds() - booked_seconds}
+
     class Meta:
         db_table = 'resource'