package org.kuali.student.ap.coursesearch.util;
   
   import java.util.Arrays;
   import java.util.HashSet;
   import java.util.List;
   import java.util.Set;
   
   import org.kuali.student.ap.coursesearch.CourseSearchItem;
   import org.kuali.student.ap.coursesearch.dataobject.CourseSearchItemImpl;
  import org.kuali.student.ap.coursesearch.dataobject.FacetItem;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Logic for building list of Course Level FacetItems and coding
   * CourseSearchItems.
   */
  public class CourseLevelFacet extends AbstractFacet {
  
  	private static final Logger LOG = LoggerFactory.getLogger(CourseLevelFacet.class);
  
  	private HashSet<Integer> courseFacetSet = new HashSet<Integer>();
  
  	public CourseLevelFacet() {
  		super();
  	}
  
  	/**
  	 * Overriding because the course level facet list needs to be in numeric
  	 * order rather than string order.
  	 * 
  	 * @return A list of FacetItems.
  	 */
  	@Override
  	public List<FacetItem> getFacetItems() {
  		Integer[] list = courseFacetSet.toArray(new Integer[0]);
  		Arrays.sort(list);
  
  		for (Integer credit : list) {
  			String display = credit.toString();
  			facetItems.add(new FacetItem(display, display));
  		}
  
  		return facetItems;
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	@Override
  	public void process(CourseSearchItem course) {
  		String key = course.getLevel();
  
  		int level;
  		try {
  			level = key == null ? 0 : Integer.valueOf(key);
  		} catch (NumberFormatException e) {
  			LOG.warn(String.format("Invalid number in course level %s", key), e);
  			level = 0;
  		}
  		courseFacetSet.add(level);
  
  		key = String.valueOf(level);
  
  		// Code the item with the facet key.
  		Set<String> keys = new HashSet<String>();
  		keys.add(key);
  		((CourseSearchItemImpl) course).setCourseLevelFacetKeys(keys);
  	}
  }