/*
 *
 * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY
 * DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT OF OR
 * RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE OR
 * ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE
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 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF
 * THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS
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 * 
 * You acknowledge that this software is not designed, licensed or
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 */


package cart;

import java.util.*;
import database.BookDetails;
 
public class ShoppingCart {
    HashMap items = null;
    int numberOfItems = 0;

    public ShoppingCart() {
        items = new HashMap();
    }

    public synchronized void add(String bookId, BookDetails book) {
        if(items.containsKey(bookId)) {
            ShoppingCartItem scitem = (ShoppingCartItem) items.get(bookId);
            scitem.incrementQuantity();
        } else {
            ShoppingCartItem newItem = new ShoppingCartItem(book);
            items.put(bookId, newItem);
        }

        numberOfItems++;
    }

    public synchronized void remove(String bookId) {
        if(items.containsKey(bookId)) {
            ShoppingCartItem scitem = (ShoppingCartItem) items.get(bookId);
            scitem.decrementQuantity();

            if(scitem.getQuantity() <= 0)
                items.remove(bookId);

            numberOfItems--;
        }
    }

    public synchronized Collection getItems() {
        return items.values();
    }

    protected void finalize() throws Throwable {
        items.clear();
    }

    public synchronized int getNumberOfItems() {
        return numberOfItems;
    }
    public synchronized double getTotal() {
        double amount = 0.0;

        for(Iterator i = getItems().iterator(); i.hasNext(); ) {
            ShoppingCartItem item = (ShoppingCartItem) i.next();
            BookDetails bookDetails = (BookDetails) item.getItem();

            amount += item.getQuantity() * bookDetails.getPrice();
        }
        return roundOff(amount);
    }

    private double roundOff(double x) {
        long val = Math.round(x*100); // cents
        return val/100.0;
    }

    public synchronized void clear() {
        items.clear();
        numberOfItems = 0;
    }
}