selectOffer method

Implementation

void selectOffer(OfferModel offer, void Function() onSelected) async {
  if (offer.offerId == null) {
    CustomFlashWidget.showFlashMessage(
      type: FlashType.error,
      title: "Invalid trip",
      message: "The trip you selected is not found",
    );
    return;
  }
  if (searchExpireTimerCount.value < 1) {
    if (currentRoute() == Routes.FLIGHT_SEARCH) {
      SessionExpiredDialog.show(
        barrierDismissible: false,
        title: 'Booking Session Expired',
        content:
            'Your 30-minute booking session has expired, and the selected flight is no longer reserved. To continue, you can either search for a new flight or review your NEOPASS Search History to quickly find similar options.',
      );
    }
    return;
  }
  expandedIndex.value = -1;
  selectedExclusiveOffer.value = null;
  selectedStandardOffer.value = offer;
  if (selectedStandardOffer.value != null) {
    Requests.box.write('offer', selectedStandardOffer.value?.toJson());
  } else {
    Requests.box.remove('offer');
  }
  await Requests.box.save();
  currentTab.value = 1;
  onSelected();
  initPassengers();
}