package org.woehlke.computer.kurzweil.conwaysgameoflive.model.census;
   
   import lombok.EqualsAndHashCode;
   import lombok.Getter;
   import lombok.ToString;
   import lombok.extern.log4j.Log4j2;
   import org.woehlke.computer.kurzweil.conwaysgameoflive.config.ComputerKurzweilProperties;
   
   import java.io.Serializable;
  import java.util.Stack;
  
  /**
   * Holds Data how many Cells per LifeCycleStatus and how many Cells in the whole Population for a Stack of Generations
   *
   * © 2006 - 2008 Thomas Woehlke.
   * @author Thomas Woehlke
   *
   * @see <a href="https://github.com/Computer-Kurzweil/conwaysgameoflife">Github Repository</a>
   * @see <a href="https://java.woehlke.org/conwaysgameoflife/">Maven Project Repository</a>
   */
  @Log4j2
  @ToString(callSuper = true, exclude={"statistics"})
  @EqualsAndHashCode(exclude={"statistics"})
  public class ConwaysGameOfLifePopulationCensusContainer implements Serializable {
  
      static final long serialVersionUID = 242L;
  
      private final int queueMaxLength;
  
      private final Stack<ConwaysGameOfLivePopulationCensus> statistics =
          new Stack<>();
  
      private volatile ConwaysGameOfLivePopulationCensus currentPopulationCensus;
  
      @Getter
      private volatile long worldIteration;
  
      public ConwaysGameOfLifePopulationCensusContainer(
          ComputerKurzweilProperties p
      ) {
          this.queueMaxLength = p.getSimulatedevolution().getControl().getQueueMaxLength();
          this.worldIteration = 0L;
      }
  
      public synchronized void push(ConwaysGameOfLivePopulationCensus populationCensus) {
          this.currentPopulationCensus = populationCensus;
          this.worldIteration++;
          populationCensus.setWorldIteration(worldIteration);
          statistics.push(populationCensus);
          if (statistics.size() > queueMaxLength) {
              statistics.removeElementAt(0);
          }
          log.info(worldIteration + " : " + populationCensus.toString());
      }
  
      public synchronized ConwaysGameOfLivePopulationCensus peek() {
          if(null == this.currentPopulationCensus) {
              ConwaysGameOfLivePopulationCensus populationCensus = new ConwaysGameOfLivePopulationCensus();
              populationCensus.setWorldIteration(worldIteration);
              statistics.push(populationCensus);
          }
          return this.currentPopulationCensus;
      }
  }