/**
 * Copyright (C) 2011 Brian Ferris <bdferris@onebusaway.org>
 * Copyright (C) 2011 Google, Inc.
 *
 * 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.services.blocks;

import java.util.List;

import org.onebusaway.gtfs.model.AgencyAndId;

/**
 * Methods for determining which {@link BlockInstance} instances are active for
 * given time ranges and other criteria. Note that this only considers SCHEDULE
 * data, not real-time data, when determining which blocks are active at a
 * particular point in time.
 * 
 * @author bdferris
 * @see BlockInstance
 * @see BlockTripIndex
 * @see FrequencyBlockTripIndex
 */
public interface BlockCalendarService {

  /**
   * Returns the {@link BlockInstance} for the block active on the specified
   * service date. Note that this function assumes an EXACT service date match.
   * If you aren't quite sure what your service date is, try the
   * {@link #getActiveBlocks(AgencyAndId, long, long)} method.
   * 
   * @param blockId
   * @param serviceDate
   * @return the block instance, or null if not found
   */
  public BlockInstance getBlockInstance(AgencyAndId blockId, long serviceDate);

  public List<BlockInstance> getActiveBlocks(AgencyAndId blockId,
      long timeFrom, long timeTo);

  public List<BlockInstance> getClosestActiveBlocks(AgencyAndId blockId,
      long time);

  public List<BlockInstance> getActiveBlocksInTimeRange(long timeFrom,
      long timeTo);

  public List<BlockInstance> getActiveBlocksForAgencyInTimeRange(
      String agencyId, long timeFrom, long timeTo);

  public List<BlockInstance> getActiveBlocksForRouteInTimeRange(
      AgencyAndId routeId, long timeFrom, long timeTo);

  public List<BlockInstance> getActiveBlocksInTimeRange(
      Iterable<BlockTripIndex> indices,
      Iterable<BlockLayoverIndex> layoverIndices,
      Iterable<FrequencyBlockTripIndex> frequencyIndices, long timeFrom,
      long timeTo);
}