package org.opentrafficsim.road.gtu.perception.object;
   
   import java.util.function.Supplier;
   
   import org.djunits.value.vdouble.scalar.Duration;
   import org.djunits.value.vdouble.scalar.Length;
   import org.opentrafficsim.core.dsol.OtsSimulatorInterface;
   import org.opentrafficsim.road.network.object.trafficlight.TrafficLight;
   import org.opentrafficsim.road.network.object.trafficlight.TrafficLightColor;
  
  /**
   * Traffic light perceived through delayed perception channel.
   * <p>
   * Copyright (c) 2024-2026 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 Wouter Schakel
   */
  public class PerceivedTrafficLightChannel extends PerceivedTrafficLight
  {
  
      /** Perception delay supplier. */
      private final Supplier<Duration> perceptionDelay;
  
      /** Simulator. */
      private final OtsSimulatorInterface simulator;
  
      /**
       * Construct a new Headway information object, for a traffic light ahead of us (or behind us, although that does not seem
       * very useful).
       * @param trafficLight the traffic light object for further observation, can not be null.
       * @param distance the distance to the traffic light, distance cannot be null.
       * @param turnOnRed whether the perceiving GTU may turn on red.
       * @param perceptionDelay perception delay supplier.
       */
      public PerceivedTrafficLightChannel(final TrafficLight trafficLight, final Length distance, final boolean turnOnRed,
              final Supplier<Duration> perceptionDelay)
      {
          super(trafficLight, distance, turnOnRed);
          this.perceptionDelay = perceptionDelay;
          this.simulator = trafficLight.getSimulator();
      }
  
      /**
       * Returns the traffic light color.
       * @return the traffic light color.
       */
      @Override
      public TrafficLightColor getTrafficLightColor()
      {
          Duration when = this.simulator.getSimulatorTime().minus(this.perceptionDelay.get());
          return getTrafficLight().getTrafficLightColor(when);
      }
  
  }