package nl.tudelft.simulation.dsol.tutorial.section42;
   
   import nl.tudelft.simulation.dsol.formalisms.eventscheduling.SimEvent;
   import nl.tudelft.simulation.dsol.logger.Cat;
   import nl.tudelft.simulation.dsol.simulators.DevsSimulatorInterface;
   import nl.tudelft.simulation.jstats.distributions.DistContinuous;
   import nl.tudelft.simulation.jstats.distributions.DistDiscrete;
   import nl.tudelft.simulation.jstats.distributions.DistEmpiricalDiscreteLong;
   import nl.tudelft.simulation.jstats.distributions.DistExponential;
  import nl.tudelft.simulation.jstats.distributions.empirical.DiscreteEmpiricalDistribution;
  import nl.tudelft.simulation.jstats.distributions.empirical.ProbabilityDensities;
  import nl.tudelft.simulation.jstats.streams.StreamInterface;
  
  /**
   * A Customer.
   * <p>
   * Copyright (c) 2002-2024 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See
   * for project information <a href="https://simulation.tudelft.nl/" target="_blank"> https://simulation.tudelft.nl</a>. The DSOL
   * project is distributed under a three-clause BSD-style license, which can be found at
   * <a href="https://https://simulation.tudelft.nl/dsol/docs/latest/license.html" target="_blank">
   * https://https://simulation.tudelft.nl/dsol/docs/latest/license.html</a>.
   * </p>
   * @author <a href="https://www.linkedin.com/in/peterhmjacobs">Peter Jacobs </a>
   */
  public class Customer implements BuyerInterface
  {
      /** the simulator to schedule on. */
      private DevsSimulatorInterface<Double> simulator = null;
  
      /** the retailer by whom we order our product. */
      private SellerInterface retailer = null;
  
      /** the intervalTime between consequtive orders. */
      private DistContinuous intervalTime = null;
  
      /** the orderBatchSize of an order. */
      private DistDiscrete orderBatchSize = null;
  
      /**
       * constructs a new Customer.
       * @param simulator DevsSimulatorInterface&lt;Double&gt;; the simulator to schedule on
       * @param retailer SellerInterface; the retailer to buy at. In more advanced examples, we would look up this retailer at a
       *            yellow page.
       */
      public Customer(final DevsSimulatorInterface<Double> simulator, final SellerInterface retailer)
      {
          super();
          this.simulator = simulator;
          this.retailer = retailer;
          StreamInterface stream = this.simulator.getModel().getStream("default");
          this.intervalTime = new DistExponential(stream, 0.1);
          DiscreteEmpiricalDistribution empDist = ProbabilityDensities.createDiscreteDistribution(new long[] {1, 2, 3, 4},
                  new double[] {1.0 / 6.0, 1.0 / 3.0, 1.0 / 3.0, 1.0 / 6.0});
          this.orderBatchSize = new DistEmpiricalDiscreteLong(stream, empDist);
          this.createOrder();
      }
  
      /** {@inheritDoc} */
      @Override
      public void receiveProduct(final long amount)
      {
          this.simulator.getLogger().filter(Cat.DSOL).trace("receiveProduct: received " + amount);
      }
  
      /**
       * creates an order.
       */
      private void createOrder()
      {
          this.retailer.order(this, this.orderBatchSize.draw());
          try
          {
              this.simulator.scheduleEvent(new SimEvent<Double>(this.simulator.getSimulatorTime() + this.intervalTime.draw(),
                      this,"createOrder", null));
          }
          catch (Exception exception)
          {
              this.simulator.getLogger().always().error(exception, "createOrder");
          }
      }
  }