package dk.hansen;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;

public class SimpleCDManager implements CDManagerIF {

   private static HashMap cds = new HashMap();
   static {
      System.out.println("SimpleCDManager created - static code");
      // Create some CDs for testing
      CD cd;
      String id;
      String title;
      String author;
      int year;

      id = "ID88";
      title = "Who knows this CD?";
      author = "The Singer";
      year = 1988;
      cd = new CD(id, title, author, year);
      cds.put(id, cd);

      id = "ID89";
      title = "I know this CD!";
      author = "The Listener";
      year = 1998;
      cd = new CD(id, title, author, year);
      cds.put(id, cd);
   }
      
   public void createCD(String id, String title, String author, int year) throws DAOException {
      CD cd = (CD)cds.get(id);
      if (cd != null) throw new DAOException("Id " + id + " is already used");
      cd = new CD(id, title, author, year);
      cds.put(id, cd);
   }

   public void updateCD(String id, String title, String author, int year) throws DAOException {
      CD cd = (CD)cds.get(id);
      if (cd == null) throw new DAOException("Id " + id + " was not found");
      cd.setTitle(title);
      cd.setAuthor(author);
      cd.setYear(year);
   }

   public void deleteCD(String id) throws DAOException {
      CD cd = (CD)cds.get(id);
      if (cd == null) throw new DAOException("Id " + id + " was not found");
      cds.remove(id);
   }

   public CD getCD(String id) throws DAOException {
      CD cd = (CD)cds.get(id);
      return cd;
   }

   public Collection getAll() {
      return cds.values();
   }

   public Collection findCDTitle(String title) {
      Collection hits = new ArrayList(); 
      Collection c = cds.values();
      for (Iterator it = c.iterator(); it.hasNext();) {
         CD cd = (CD)it.next();
         if (cd.getTitle().toUpperCase().indexOf(title.toUpperCase()) > -1) {
            hits.add(cd);
         }
      }
      return hits;
   }
   public Collection findCDAuthor(String author) {
      Collection hits = new ArrayList(); 
      Collection c = cds.values();
      for (Iterator it = c.iterator(); it.hasNext();) {
         CD cd = (CD)it.next();
         if (cd.getAuthor().toUpperCase().indexOf(author.toUpperCase()) > -1) {
            hits.add(cd);
         }
      }
      return hits;
   }
   public Collection findCDYear(int year) {
      Collection hits = new ArrayList(); 
      Collection c = cds.values();
      for (Iterator it = c.iterator(); it.hasNext();) {
         CD cd = (CD)it.next();
         if (cd.getYear() == year) {
            hits.add(cd);
         }
      }
      return hits;
   }
}