package org.paneris.bibliomania;

 import java.util.Enumeration;

 import java.util.Hashtable;

 import org.melati.Melati;

 import org.melati.poem.Persistent;

 import org.melati.poem.PoemThread;

 import org.webmacro.servlet.WebContext;

 public class Buy extends BibliomaniaServlet {

   /**

    * 

    */

   private static final long serialVersionUID = 1L;

   protected String bibliomaniaHandle(Melati melati, WebContext context)

     throws Exception {

     BibliomaniaDatabase database = (BibliomaniaDatabase)melati.getDatabase();

     melati.setBufferingOff();

     melati.setFlushingOn();

     melati.setPassbackExceptionHandling();

     Persistent obj = melati.getObject();

     String title_search = context.getForm("title_search");

     String author_search = context.getForm("author_search");

     StockingsSearch search;

     boolean noTerms =

       (title_search == null || title_search.trim().equals(""))

         && (author_search == null || author_search.trim().equals(""));

     if (noTerms) {

       if (obj instanceof Book) {

         search = database.getStockingsSearchTable().searchFor((Book)obj);

         title_search = search.getTitleterm();

         author_search = search.getAuthorterm();

       } else {

         search = null;

         if (obj instanceof Author)

           author_search = ((Author)obj).getLongname();

       }

     } else

       search =

         database.getStockingsSearchTable().searchFor(

           author_search,

           title_search);

     if (search != null) {

       String cachedResults = search.cachedResultsPath();

       if (cachedResults != null)

         context.put("cachedResults", cachedResults);

       else {

         if (!database.okToRunABookshopSearch())

           return bibliomaniaTemplate("metasearch/TooBusy.wm");

         context.put(

           "results",

           new CollatedHitsEnumeration(

             search.newSearchResults(),

             database.bookshops().length,

             database.getBookStockingsOutputStartOffset()));

       }

     }

     PoemThread.commit();

     context.put("title_search", title_search);

     context.put("author_search", author_search);

     return bibliomaniaTemplate("metasearch/Results.wm");

   }

   public static class Hit {

     public Integer lineNo;

     public Integer headerLineNo;

     public boolean isFirst;

     public boolean isFirstThumbnail;

     public boolean hadThumbnail;

     public BookStocking stocking;

   }

   public static class CollatedHitsEnumeration implements Enumeration {

     private Enumeration hits;

     private int numBookshops;

     private int startRow;

     private Hashtable lastHitOfISBN = new Hashtable();

     private int discreteBooks;

     public CollatedHitsEnumeration(

       Enumeration hits,

       int numBookshops,

       int startRow) {

       this.hits = hits;

       this.numBookshops = numBookshops;

       this.startRow = startRow;

     }

     public boolean hasMoreElements() {

       return hits.hasMoreElements();

     }

     public Object nextElement() {

       BookStocking stocking = (BookStocking)hits.nextElement();

       Hit hit = new Hit();

       hit.stocking = stocking;

       String isbn = stocking.getIsbn();

       hit.isFirstThumbnail = stocking.getThumbnailurl() != null;

       hit.hadThumbnail = hit.isFirstThumbnail;

       Hit last =

         isbn == null || isbn.equals("") ? null : (Hit)lastHitOfISBN.get(isbn);

       if (last == null) {

         hit.isFirst = true;

         hit.headerLineNo =

           new Integer(startRow + discreteBooks++ * (numBookshops + 3));

         hit.lineNo = new Integer(hit.headerLineNo.intValue() + 2);

       } else {

         hit.headerLineNo = last.headerLineNo;

         hit.lineNo = new Integer(last.lineNo.intValue() + 1);

         if (last.hadThumbnail) {

           hit.hadThumbnail = true;

           hit.isFirstThumbnail = false;

         }

       }

       if (isbn != null)

         lastHitOfISBN.put(isbn, hit);

       return hit;

     }

   }

 }