Function UpdateStationRating

src/station_cmd.cpp:3973–4134

* Periodic update of a station's rating. * @param st The station to update. */

 * @param st The station to update.
 */
static void UpdateStationRating(Station *st)
{
	bool waiting_changed = false;

	byte_inc_sat(&st->time_since_load);
	byte_inc_sat(&st->time_since_unload);

	for (const CargoSpec *cs : CargoSpec::Iterate()) {
		GoodsEntry *ge = &st->goods[cs->Index()];

		/* The station might not currently be moving this cargo. */
		if (!ge->HasRating()) {
			/* Slowly increase the rating back to its original level in the case we
			 *  didn't deliver cargo yet to this station. This happens when a bribe
			 *  failed while you didn't moved that cargo yet to a station. */
			if (ge->rating < INITIAL_STATION_RATING) ge->rating++;

			/* Nothing else to do with this cargo. */
			continue;
		}

		byte_inc_sat(&ge->time_since_pickup);

		/* If this cargo hasn't been picked up in a long time, get rid of it. */
		if (ge->time_since_pickup == 255 && _settings_game.order.selectgoods) {
			ge->status.Reset(GoodsEntry::State::Rating);
			ge->last_speed = 0;
			TruncateCargo(cs, ge);
			waiting_changed = true;
			continue;
		}

		bool skip = false;
		int rating = 0;
		uint waiting = ge->AvailableCount();

		/* num_dests is at least 1 if there is any cargo as
		 * StationID::Invalid() is also a destination.
		 */
		uint num_dests = ge->HasData() ? static_cast<uint>(ge->GetData().cargo.Packets()->MapSize()) : 0;

		/* Average amount of cargo per next hop, but prefer solitary stations
		 * with only one or two next hops. They are allowed to have more
		 * cargo waiting per next hop.
		 * With manual cargo distribution waiting_avg = waiting / 2 as then
		 * StationID::Invalid() is the only destination.
		 */
		uint waiting_avg = waiting / (num_dests + 1);

		if (_cheats.station_rating.value) {
			ge->rating = rating = MAX_STATION_RATING;
			skip = true;
		} else if (cs->callback_mask.Test(CargoCallbackMask::StationRatingCalc)) {
			/* Perform custom station rating. If it succeeds the speed, days in transit and
			 * waiting cargo ratings must not be executed. */

			/* NewGRFs expect last speed to be 0xFF when no vehicle has arrived yet. */
			uint last_speed = ge->HasVehicleEverTriedLoading() ? ge->last_speed : 0xFF;