package org.opentrafficsim.road.gtu.generator.headway;
   
   import java.util.Optional;
   
   import org.djunits.value.vdouble.scalar.Duration;
   import org.djunits.value.vdouble.scalar.Frequency;
   import org.djunits.value.vdouble.vector.DurationVector;
   import org.djunits.value.vdouble.vector.FrequencyVector;
   import org.opentrafficsim.road.od.Interpolation;
  
  /**
   * Demand pattern defined by a frequency vector, time vector and interpolation.
   * <p>
   * Copyright (c) 2013-2024 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="https://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
   * </p>
   * @author <a href="https://github.com/averbraeck">Alexander Verbraeck</a>
   * @author <a href="https://github.com/peter-knoppers">Peter Knoppers</a>
   * @author <a href="https://github.com/wjschakel">Wouter Schakel</a>
   * @param demandVector demand vector
   * @param timeVector time vector
   * @param interpolation interpolation
   */
  public record DemandPattern(FrequencyVector demandVector, DurationVector timeVector, Interpolation interpolation)
          implements Arrivals
  {
  
      @Override
      public Frequency getFrequency(final Duration time, final boolean sliceStart)
      {
          return this.interpolation.interpolateVector(time, this.demandVector, this.timeVector, sliceStart);
      }
  
      @Override
      public Optional<Duration> nextTimeSlice(final Duration time)
      {
          for (Duration d : this.timeVector)
          {
              if (d.gt(time))
              {
                  return Optional.of(d);
              }
          }
          return Optional.empty();
      }
  
  }