Preserve event trigger state on iCal update

The iCal parser now retains the triggered and endTriggered flags for events that persist across updates, matching by start time and title. This prevents unnecessary reset of trigger states for recurring or unchanged events.

Author: kendrick90

usermods/google_calendar_scheduler/google_calendar_scheduler.cpp

@@ -323,6 +323,13 @@ bool GoogleCalendarScheduler::fetchCalendarEvents() {
 
 // Simple iCal parser - extracts VEVENT blocks
 void GoogleCalendarScheduler::parseICalData(String& icalData) {
+  // Store old events to preserve trigger state
+  CalendarEvent oldEvents[MAX_EVENTS];
+  uint8_t oldEventCount = eventCount;
+  for (uint8_t i = 0; i < oldEventCount; i++) {
+    oldEvents[i] = events[i];
+  }
+
   eventCount = 0;
 
   int pos = 0;
@@ -398,9 +405,23 @@ void GoogleCalendarScheduler::parseICalData(String& icalData) {
       event.endTime = parseICalDateTime(dtEnd);
     }
 
-    // Reset trigger flags
-    event.triggered = false;
-    event.endTriggered = false;
+    // Preserve trigger state if this event existed before with same start time
+    bool foundMatch = false;
+    for (uint8_t i = 0; i < oldEventCount; i++) {
+      if (oldEvents[i].startTime == event.startTime &&
+          oldEvents[i].title == event.title) {
+        event.triggered = oldEvents[i].triggered;
+        event.endTriggered = oldEvents[i].endTriggered;
+        foundMatch = true;
+        break;
+      }
+    }
+
+    // Reset trigger flags only for new events
+    if (!foundMatch) {
+      event.triggered = false;
+      event.endTriggered = false;
+    }
 
     DEBUG_PRINT(F("Calendar: Event "));
     DEBUG_PRINT(eventCount);