chore: sync GovOPlaN module split state

src/govoplan_calendar/backend/ical.py

@@ -92,6 +92,8 @@ def parse_vevent_component(calendar: Calendar, event: Event, *, raw_ics: str) ->
     properties = component_property_records(event)
     alarms = [component_alarm_record(alarm) for alarm in event.subcomponents if alarm.name == "VALARM"]
     standard = standard_property_index(properties)
+    if dtend is None and duration_seconds is not None:
+        standard["uses_duration"] = True
 
     return {
         "uid": uid,
@@ -154,7 +156,9 @@ def event_to_component(event: Any) -> Event:
     component.add("uid", event.uid)
     component.add("dtstamp", datetime.now(timezone.utc))
     component.add("dtstart", event_temporal_value(event.start_at, all_day=event.all_day, timezone_id=event.timezone))
-    if event.end_at is not None:
+    if event_uses_duration(event):
+        component.add("duration", timedelta(seconds=int(event.duration_seconds)))
+    elif event.end_at is not None:
         component.add("dtend", event_temporal_value(event.end_at, all_day=event.all_day, timezone_id=event.timezone))
     elif getattr(event, "duration_seconds", None) is not None:
         component.add("duration", timedelta(seconds=int(event.duration_seconds)))
@@ -474,6 +478,16 @@ def metadata_value(event: Any, key: str) -> str | None:
     return str(value) if value else None
 
 
+def event_uses_duration(event: Any) -> bool:
+    if getattr(event, "duration_seconds", None) is None:
+        return False
+    raw_metadata = getattr(event, "icalendar", None)
+    if not isinstance(raw_metadata, dict):
+        return False
+    standard = raw_metadata.get("standard")
+    return isinstance(standard, dict) and standard.get("uses_duration") is True
+
+
 def event_temporal_value(value: datetime, *, all_day: bool, timezone_id: str | None) -> date | datetime:
     value = normalize_datetime(value)
     if all_day: