package org.opentrafficsim.road.network.control.rampmetering;
   
   import org.opentrafficsim.base.OtsRuntimeException;
   import org.opentrafficsim.base.logger.Logger;
   import org.opentrafficsim.core.dsol.OtsSimulatorInterface;
   
   import nl.tudelft.simulation.dsol.SimRuntimeException;
   
   /**
   * Ramp metering. This consist of a {@code RampMeteringSwitch} and a {@code RampMeteringLightController}.
   * <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 RampMetering
  {
  
      /** Simulator. */
      private final OtsSimulatorInterface simulator;
  
      /** Ramp metering switch. */
      private final RampMeteringSwitch rampSwitch;
  
      /** Ramp metering light controller. */
      private final RampMeteringLightController rampLightController;
  
      /**
       * Constructor.
       * @param simulator simulator
       * @param rampSwitch ramp metering switch
       * @param rampLightController ramp metering light controller
       */
      public RampMetering(final OtsSimulatorInterface simulator, final RampMeteringSwitch rampSwitch,
              final RampMeteringLightController rampLightController)
      {
          this.simulator = simulator;
          this.rampSwitch = rampSwitch;
          this.rampLightController = rampLightController;
          control();
      }
  
      /**
       * Executes control in a cyclic manner.
       */
      private void control()
      {
          if (this.rampSwitch.isEnabled())
          {
              Logger.ots().info("Ramp-metering enabled.");
              this.rampLightController.enable(this.rampSwitch.getCycleTime());
          }
          else
          {
              Logger.ots().info("Ramp-metering disabled.");
              this.rampLightController.disable();
          }
          try
          {
              this.simulator.scheduleEventRel(this.rampSwitch.getInterval(), () -> control());
          }
          catch (SimRuntimeException exception)
          {
              throw new OtsRuntimeException("Interval from ramp metering switch is not a valid positive duration.", exception);
          }
      }
  
  }