package org.opentrafficsim.kpi.sampling.indicator;
   
   import org.djunits.value.vdouble.scalar.Duration;
   import org.djunits.value.vdouble.scalar.Length;
   import org.djunits.value.vdouble.scalar.Speed;
   import org.djunits.value.vdouble.scalar.Time;
   import org.opentrafficsim.kpi.sampling.Query;
   import org.opentrafficsim.kpi.sampling.Trajectory;
   import org.opentrafficsim.kpi.sampling.TrajectoryGroup;
  
  /**
   * Sum of trajectory durations minus the sum of trajectory lengths divided by a reference speed.
   * <p>
   * Copyright (c) 2013-2016 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="http://opentrafficsim.org/node/13">OpenTrafficSim License</a>.
   * <p>
   * @version $Revision$, $LastChangedDate$, by $Author$, initial version 1 okt. 2016 <br>
   * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a>
   * @author <a href="http://www.tudelft.nl/pknoppers">Peter Knoppers</a>
   * @author <a href="http://www.transport.citg.tudelft.nl">Wouter Schakel</a>
   */
  // TODO something better than a global reference speed defined at the indicator
  public class TotalDelay extends AbstractIndicator<Duration>
  {
  
      /** Reference speed for delay. */
      private final Speed referenceSpeed;
  
      /**
       * @param referenceSpeed reference speed for delay
       */
      public TotalDelay(final Speed referenceSpeed)
      {
          this.referenceSpeed = referenceSpeed;
      }
  
      /** {@inheritDoc} */
      @Override
      public final Duration calculate(final Query query, final Time startTime, final Time endTime)
      {
          Duration sumTime = Duration.ZERO;
          Length sumDist = Length.ZERO;
          for (TrajectoryGroup trajectoryGroup : query.getTrajectoryGroups(startTime, endTime))
          {
              // TODO: use data points and limit speed per interval
              for (Trajectory trajectory : trajectoryGroup.getTrajectories())
              {
                  sumTime = sumTime.plus(trajectory.getTotalDuration());
                  sumDist = sumDist.plus(trajectory.getTotalLength());
              }
          }
          return sumTime.minus(sumDist.divideBy(this.referenceSpeed));
      }
  
      /** {@inheritDoc} */
      @Override
      @SuppressWarnings("checkstyle:designforextension")
      public String toString()
      {
          return "TotalDelay [referenceSpeed=" + this.referenceSpeed + "]";
      }
  
  }