/*
 * Copyright (c) 1998-2018 University Corporation for Atmospheric Research/Unidata
 * See LICENSE for license information.
 */
// $Id: SimpleLatestProxyDsHandler.java 63 2006-07-12 21:50:51Z edavis $
package thredds.cataloggen.inserter;

import thredds.catalog.InvService;
import thredds.cataloggen.ProxyDatasetHandler;
import thredds.cataloggen.InvCrawlablePair;
import thredds.crawlabledataset.CrawlableDataset;
import thredds.crawlabledataset.CrawlableDatasetFilter;
import java.util.*;

/**
 * _more_
 *
 * @author edavis
 * @since Nov 29, 2005 12:12:53 PM
 */
public class SimpleLatestProxyDsHandler implements ProxyDatasetHandler {
  // private static org.slf4j.Logger log =
  // org.slf4j.LoggerFactory.getLogger( LatestCompleteProxyDsHandler.class );

  private String latestName;
  private boolean locateAtTopOrBottom;
  private InvService service;
  private final boolean isResolver;

  /**
   * Constructor.
   *
   * The latestName is used as the name of latest dataset created. The
   * location for the placement of the latest dataset is given by
   * locateAtTopOrBottom (true - locate on top; false - locate on bottom).
   *
   * @param latestName the name to be used for all latest dataset, if null, the default is "latest.xml".
   * @param locateAtTopOrBottom indicates where to locate the latest dataset (true - locate on top; false - locate on
   *        bottom).
   * @param service the InvService used by the created dataset.
   */
  public SimpleLatestProxyDsHandler(String latestName, boolean locateAtTopOrBottom, InvService service,
      boolean isResolver) {
    this.latestName = latestName;
    this.locateAtTopOrBottom = locateAtTopOrBottom;
    this.service = service;
    this.isResolver = isResolver;
  }

  public boolean isLocateAtTopOrBottom() {
    return locateAtTopOrBottom;
  }

  public Object getConfigObject() {
    return null;
  }

  public String getProxyDatasetName() {
    return this.latestName;
  }

  public CrawlableDataset createProxyDataset(CrawlableDataset parent) {
    return new MyCrawlableDataset(parent, this.latestName);
  }

  public InvService getProxyDatasetService(CrawlableDataset parent) {
    return service;
  }

  public int getProxyDatasetLocation(CrawlableDataset parent, int collectionDatasetSize) {
    if (locateAtTopOrBottom)
      return 0;
    else
      return collectionDatasetSize;
  }

  public boolean isProxyDatasetResolver() {
    return this.isResolver;
  }

  public InvCrawlablePair getActualDataset(List atomicDsInfo) {
    if (atomicDsInfo == null || atomicDsInfo.isEmpty())
      return null;

    // Get the maximum item according to lexigraphic comparison of InvDataset names.
    return (InvCrawlablePair) Collections.max(atomicDsInfo, new Comparator() {
      public int compare(Object obj1, Object obj2) {
        InvCrawlablePair dsInfo1 = (InvCrawlablePair) obj1;
        InvCrawlablePair dsInfo2 = (InvCrawlablePair) obj2;
        return (dsInfo1.getInvDataset().getName().compareTo(dsInfo2.getInvDataset().getName()));
      }
    });
  }

  public String getActualDatasetName(InvCrawlablePair actualDataset, String baseName) {
    if (baseName == null)
      baseName = "";
    return baseName.equals("") ? "Latest" : "Latest " + baseName;
  }

  /**
   *
   */
  private static class MyCrawlableDataset implements CrawlableDataset {
    private CrawlableDataset parent;
    private String name;

    MyCrawlableDataset(CrawlableDataset parent, String name) {
      this.parent = parent;
      this.name = name;
    }

    public Object getConfigObject() {
      return null;
    }

    public String getPath() {
      return parent.getPath() + "/" + name;
    }

    public String getName() {
      return name;
    }

    public CrawlableDataset getParentDataset() {
      return parent;
    }

    public boolean exists() {
      return true; // @todo ????
    }

    public boolean isCollection() {
      return false;
    }

    public CrawlableDataset getDescendant(String childPath) {
      return null;
    }

    public List listDatasets() {
      return null;
    }

    public List listDatasets(CrawlableDatasetFilter filter) {
      return null;
    }

    public long length() {
      return -1;
    }

    public Date lastModified() // or long milliseconds?
    {
      return null;
    }
  }
}
