/**
 *  '$RCSfile$'
 *  Copyright: 2008 Regents of the University of California and the
 *             National Center for Ecological Analysis and Synthesis
 *
 * Author: Benjamin Leinfelder 
 * '$Date:  $'
 * '$Revision:  $'
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.ucsb.nceas.metacat.cart;

import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import edu.ucsb.nceas.metacat.service.SessionService;


/**
 * Class to query data
 */
public class CartManager {

	private static Log log = LogFactory.getLog(CartManager.class);

	private String sessionId = null;
	private DocumentCart documentCart = null;
	
	/**
	 * empty constructor to initialize query
	 */
	public CartManager() {
		init();
	}
	
	public CartManager(String sessionId) {
		// initialize the necessary parts
		this.sessionId = sessionId;
		init();
	}
	
	private void init() {
		documentCart = SessionService.getInstance().getRegisteredSession(sessionId).getDocumentCart();
		if (documentCart == null) {
			documentCart = new DocumentCart();
		}
		
	}
	
	public void editCart(String operation, String[] docids, Map fields) {
		
		//for attribute fields
		if (operation.equalsIgnoreCase("addField")) {
			documentCart.addFields(fields);
		}
		if (operation.equalsIgnoreCase("removeField")) {
			String field = (String) fields.keySet().toArray()[0];
			documentCart.removeField(field);
		}
		if (operation.equalsIgnoreCase("addFields")) {
			documentCart.addFields(fields);
		}
		if (operation.equalsIgnoreCase("clearfields")) {
			documentCart.clearFields();
		}
		
		//for document ids
		if (operation.equalsIgnoreCase("clear")) {
			documentCart.clear();
		}
		if (docids != null) {
			for (int i=0; i < docids.length; i++) {
				if (operation.equalsIgnoreCase("add")) {
					documentCart.addDocument(docids[i], fields);
				}
				if (operation.equalsIgnoreCase("remove")) {
					documentCart.removeDocument(docids[i]);
				}
			}
		}
		
		SessionService.getInstance().getRegisteredSession(sessionId).setDocumentCart(documentCart);
	}

}