Change field length.

[redakcja.git] / src / team / models.py

diff --git a/src/team/models.py b/src/team/models.py
index 6e53dd3..31f4435 100644 (file)
--- a/src/team/models.py
+++ b/src/team/models.py
@@ -1,3 +1,4 @@
+from datetime import timedelta
 from django.conf import settings
 from django.db import models
 from django.utils.timezone import now
@@ -16,18 +17,46 @@ class Profile(models.Model):
 
 
 class Presence(models.Model):
-    user = models.ForeignKey(settings.AUTH_USER_MODEL, models.CASCADE)
+    GAP_THRESHOLD = 10
+
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, models.CASCADE, null=True, blank=True)
+    session_key = models.CharField(max_length=255)
     chunk = models.ForeignKey('documents.Chunk', models.SET_NULL, blank=True, null=True)
-    timestamp = models.DateTimeField(auto_now_add=True, db_index=True)
+    since = models.DateTimeField(auto_now_add=True, db_index=True)
+    until = models.DateTimeField(db_index=True)
     active = models.BooleanField()
 
     @classmethod
-    def report(cls, user, chunk, active):
-        if user.is_anonymous or not hasattr(user, 'profile') or not user.profile.presence:
-            return
-        cls.objects.create(
+    def report(cls, user, session_key, chunk, active):
+        user = user if not user.is_anonymous else None
+        report = cls.objects.filter(
             user=user,
+            session_key=session_key,
+            chunk=chunk,
+            until__gt=now() - timedelta(seconds=cls.GAP_THRESHOLD)
+        ).order_by('-until').first()
+        if report is None or report.active != active:
+            report = cls.objects.create(
+                user=user,
+                session_key=session_key,
+                chunk=chunk,
+                active=active,
+                until=now(),
+            )
+        else:
+            report.until = now()
+            report.save()
+
+    @classmethod
+    def get_current(cls, session_key, chunk):
+        sessions = set()
+        presences = []
+        for p in cls.objects.filter(
             chunk=chunk,
-            timestamp=now(),
-            active=active
-        )
+            until__gt=now() - timedelta(seconds=cls.GAP_THRESHOLD)
+        ).exclude(session_key=session_key).order_by('-since'):
+            if p.session_key not in sessions:
+                sessions.add(p.session_key)
+                presences.append(p)
+        presences.reverse()
+        return presences