From eaf79b1abcaf6ac4eec8055a71bf793a31e810c7 Mon Sep 17 00:00:00 2001
From: Oliver Ni <oliver.ni@gmail.com>
Date: Thu, 5 Oct 2023 14:07:06 -0700
Subject: [PATCH] Add dummy event for sync frequency

---
 hknweb/events/models/ical_view.py | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/hknweb/events/models/ical_view.py b/hknweb/events/models/ical_view.py
index d665cae8..5739c6f1 100644
--- a/hknweb/events/models/ical_view.py
+++ b/hknweb/events/models/ical_view.py
@@ -1,10 +1,13 @@
+import random
 import uuid
+from datetime import datetime, timedelta
 
 import icalendar
 from django.conf import settings
 from django.db import models
 from django.urls import reverse
 
+from hknweb.events.models import Event
 from hknweb.events.utils import get_events
 
 
@@ -31,4 +34,30 @@ def to_ical_obj(self):
         for event in events:
             cal.add_component(event.to_ical_obj())
 
+        cal.add_component(self.dummy_event())
         return cal
+
+    def dummy_event(self):
+        # Google Calendar doesn't let you configure how often to sync iCal feeds
+        # like Apple's Calendar app does. They say this can take up to 24 hours.
+
+        # According to https://webapps.stackexchange.com/a/66686, they probably
+        # look at how often the iCal feed itself changes and syncs more or less
+        # frequently based on that.
+
+        # So we add a dummy event in the far future that's randomized every time
+        # the feed is requested in hopes of making Google Calendar sync faster.
+
+        dt = datetime(3000, 1, 1) + timedelta(days=random.randrange(365))
+
+        event = icalendar.Event()
+        event.add("uid", "dummy")
+        event.add("summary", "Dummy Event")
+        event.add(
+            "description",
+            "Randomized dummy event to make Google Calendar sync faster",
+        )
+        event.add("dtstart", dt)
+        event.add("dtend", dt)
+        event.add("dtstamp", dt)
+        return event