package dk.hansen;

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

public class SimpleBookManager implements BookManagerIF {

   private static HashMap books = new HashMap();
   static {
      System.out.println("SimpleBookManager created - static code");
      // Create some Books for testing
      Book book;
      String id;
      String title;
      String author;
      int year;

      id = "ID30";
      title = "The Tempest";
      author = "William Shakespeare";
      year = 1611;
      book = new Book(id, title, author, year);
      books.put(id, book);

      id = "ID31";
      title = "A Midsummer Night's Dream";
      author = "William Shakespeare";
      year = 1595;
      book = new Book(id, title, author, year);
      books.put(id, book);
   }
      
   public void createBook(String id, String title, String author, int year) throws DAOException {
      Book book = (Book)books.get(id);
      if (book != null) throw new DAOException("Id " + id + " is already used");
      book = new Book(id, title, author, year);
      books.put(id, book);
   }

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

   public void deleteBook(String id) throws DAOException {
      Book book = (Book)books.get(id);
      if (book == null) throw new DAOException("Id " + id + " was not found");
      books.remove(id);
   }

   public Book getBook(String id) throws DAOException {
      Book book = (Book)books.get(id);
      return book;
   }

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

   public Collection findBookTitle(String title) {
      Collection hits = new ArrayList(); 
      Collection c = books.values();
      for (Iterator it = c.iterator(); it.hasNext();) {
         Book book = (Book)it.next();
         if (book.getTitle().toUpperCase().indexOf(title.toUpperCase()) > -1) {
            hits.add(book);
         }
      }
      return hits;
   }
   public Collection findBookAuthor(String author) {
      Collection hits = new ArrayList(); 
      Collection c = books.values();
      for (Iterator it = c.iterator(); it.hasNext();) {
         Book book = (Book)it.next();
         if (book.getAuthor().toUpperCase().indexOf(author.toUpperCase()) > -1) {
            hits.add(book);
         }
      }
      return hits;
   }
   public Collection findBookYear(int year) {
      Collection hits = new ArrayList(); 
      Collection c = books.values();
      for (Iterator it = c.iterator(); it.hasNext();) {
         Book book = (Book)it.next();
         if (book.getYear() == year) {
            hits.add(book);
         }
      }
      return hits;
   }
}