/**
 * Copyright (C) 2011 Brian Ferris <bdferris@onebusaway.org>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.onebusaway.transit_data_federation.impl.otp;

import java.util.List;

import org.onebusaway.transit_data_federation.services.realtime.ArrivalAndDepartureInstance;
import org.onebusaway.transit_data_federation.services.transit_graph.BlockConfigurationEntry;
import org.onebusaway.transit_data_federation.services.transit_graph.BlockStopTimeEntry;
import org.onebusaway.transit_data_federation.services.transit_graph.BlockTripEntry;
import org.onebusaway.transit_data_federation.services.tripplanner.StopTimeInstance;
import org.opentripplanner.routing.core.TraverseMode;
import org.opentripplanner.routing.core.TraverseModeSet;
import org.opentripplanner.routing.core.TraverseOptions;

public class SupportLibrary {

  public static boolean isTransitEnabled(TraverseOptions options) {
    TraverseModeSet modes = options.getModes();
    if (modes == null)
      return true;
    return modes.contains(TraverseMode.TRANSIT);
  }

  public static boolean hasPreviousStopTime(ArrivalAndDepartureInstance instance) {
    return instance.getBlockStopTime().getBlockSequence() > 0;
  }

  public static boolean hasNextStopTime(ArrivalAndDepartureInstance instance) {
    BlockStopTimeEntry stopTime = instance.getBlockStopTime();
    BlockTripEntry trip = stopTime.getTrip();
    BlockConfigurationEntry blockConfig = trip.getBlockConfiguration();
    List<BlockStopTimeEntry> stopTimes = blockConfig.getStopTimes();
    return stopTime.getBlockSequence() + 1 < stopTimes.size();
  }
  
  public static boolean hasNextStopTime(StopTimeInstance instance) {
    BlockStopTimeEntry stopTime = instance.getStopTime();
    BlockTripEntry trip = stopTime.getTrip();
    BlockConfigurationEntry blockConfig = trip.getBlockConfiguration();
    List<BlockStopTimeEntry> stopTimes = blockConfig.getStopTimes();
    return stopTime.getBlockSequence() + 1 < stopTimes.size();
  }

  public static long getNextTimeWindow(GraphContext context, long time) {
    int interval = context.getStopTimeSearchInterval() * 60 * 1000;
    long snapped = (time / interval) * interval;
    while (snapped < time)
      snapped += interval;
    if (snapped == time)
      return time + interval;
    return snapped;
  }

  public static long getNextTimeWindow(int stopTimeSearchInterval, long time) {
    int interval = stopTimeSearchInterval * 60 * 1000;
    long snapped = (time / interval) * interval;
    while (snapped < time)
      snapped += interval;
    if (snapped == time)
      return time + interval;
    return snapped;
  }

  public static long getPreviousTimeWindow(GraphContext context, long time) {
    int interval = context.getStopTimeSearchInterval() * 60 * 1000;
    long snapped = (time / interval) * interval;
    if (snapped == time)
      return snapped - interval;
    return snapped;
  }
}