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package org.opentripplanner.netex.mapping.calendar;

import static org.opentripplanner.netex.mapping.support.ServiceAlterationFilter.isRunning;

import java.time.LocalDate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import javax.annotation.Nullable;
import org.opentripplanner.netex.index.api.ReadOnlyHierarchicalMapById;
import org.rutebanken.netex.model.DatedServiceJourney;
import org.rutebanken.netex.model.OperatingDay;
import org.rutebanken.netex.model.OperatingDayRefStructure;

/**
 * This class is responsible for indexing and mapping {@link DatedServiceJourney}.
 */
public class DatedServiceJourneyMapper {

  /**
   * Map a list of DSJs to a set of service days.
   */
  public static Collection mapToServiceDates(
    Iterable dsjs,
    ReadOnlyHierarchicalMapById operatingDayById
  ) {
    List result = new ArrayList<>();
    for (DatedServiceJourney dsj : dsjs) {
      // TODO This currently skips mapping of any trips containing ServiceAlteration CANCELLATION
      //      or REPLACED. In the future we will want to import these and allow them to be routed
      //      on if a parameter is set.
      if (!isRunning(dsj.getServiceAlteration())) {
        continue;
      }

      OperatingDay opDay = operatingDay(dsj, operatingDayById);
      if (opDay != null) {
        result.add(OperatingDayMapper.map(opDay));
      } else {
        // There is a validation on this, so we should never get here
        throw new NullPointerException(
          "DatedServiceJourney operating-day not found. DSJ Id: " + dsj.getId()
        );
      }
    }
    return result;
  }

  @Nullable
  private static OperatingDay operatingDay(
    DatedServiceJourney dsj,
    ReadOnlyHierarchicalMapById operatingDayById
  ) {
    OperatingDayRefStructure operatingDayRef = dsj.getOperatingDayRef();
    return operatingDayRef == null ? null : operatingDayById.lookup(operatingDayRef.getRef());
  }
}