Add stopgap ETA of 1 second when the shuttle has arrived at a stop

src/repositories/shuttle/eta/RedisSelfUpdatingETARepository.ts

@@ -102,9 +102,25 @@ export class RedisSelfUpdatingETARepository extends BaseRedisETARepository imple
   }
 
   private async handleShuttleUpdate(shuttle: IShuttle) {
+    const isAtStop = await this.shuttleRepository.checkIfShuttleIsAtStop(shuttle.id);
     const lastStop = await this.shuttleRepository.getShuttleLastStopArrival(shuttle.id);
     if (!lastStop) return;
 
+    if (isAtStop) {
+      // Update the ETA *to* the stop the shuttle is currently at,
+      // before starting from the current stop as normal.
+      // Account for cases where the shuttle arrived way earlier than
+      // expected based on the calculated ETA.
+
+      await this.addOrUpdateEta({
+        secondsRemaining: 1,
+        shuttleId: shuttle.id,
+        stopId: lastStop.stopId,
+        systemId: shuttle.systemId,
+        updatedTime: new Date(),
+      });
+    }
+
     const lastOrderedStop = await this.shuttleRepository.getOrderedStopByRouteAndStopId(shuttle.routeId, lastStop.stopId);
 
     await this.updateCascadingEta({