package org.opentrafficsim.road.gtu.lane.perception.mental;
   
   import static org.opentrafficsim.base.parameters.constraint.NumericConstraint.POSITIVEZERO;
   
   import org.djunits.value.vdouble.scalar.Duration;
   import org.opentrafficsim.base.parameters.ParameterException;
   import org.opentrafficsim.base.parameters.ParameterTypeDouble;
   import org.opentrafficsim.base.parameters.ParameterTypes;
   import org.opentrafficsim.base.parameters.Parameters;
  import org.opentrafficsim.road.gtu.lane.perception.mental.Fuller.BehavioralAdaptation;
  
  /**
   * Behavioral adaptation which increases the desired headway to reduce task-demand.
   * <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>
   */
  public class AdaptationHeadway implements BehavioralAdaptation
  {
  
      /** Parameter for desired headway scaling. */
      public static final ParameterTypeDouble BETA_T =
              new ParameterTypeDouble("Beta_T", "max headway scaling", 1.0, POSITIVEZERO);
  
      /** Base value for the minimum desired headway. */
      private Duration t0Min;
  
      /** Base value for the maximum desired headway. */
      private Duration t0Max;
  
      @Override
      public void adapt(final Parameters parameters, final double taskSaturation) throws ParameterException
      {
          if (this.t0Min == null)
          {
              this.t0Min = parameters.getParameterOrNull(ParameterTypes.TMIN);
              this.t0Max = parameters.getParameterOrNull(ParameterTypes.TMAX);
          }
          double eps = parameters.getParameter(Fuller.TS) - parameters.getParameter(Fuller.TS_CRIT);
          eps = eps < 0.0 ? 0.0 : (eps > 1.0 ? 1.0 : eps);
          double factor = 1.0 + parameters.getParameter(BETA_T) * eps;
          Duration tMin = this.t0Min.times(factor);
          Duration tMax = this.t0Max.times(factor);
          if (tMax.si <= parameters.getParameter(ParameterTypes.TMIN).si)
          {
              parameters.setParameter(ParameterTypes.TMIN, tMin);
              parameters.setParameter(ParameterTypes.TMAX, tMax);
          }
          else
          {
              parameters.setParameter(ParameterTypes.TMAX, tMax);
              parameters.setParameter(ParameterTypes.TMIN, tMin);
          }
      }
  
  }