/**
    * Copyright 2011 The Kuali Foundation Licensed under the
    * Educational Community License, Version 2.0 (the "License"); you may
    * not use this file except in compliance with the License. You may
    * obtain a copy of the License at
    *
    * http://www.osedu.org/licenses/ECL-2.0
    *
    * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an "AS IS"
   * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
   * or implied. See the License for the specific language governing
   * permissions and limitations under the License.
   */
  
  package org.kuali.mobility.dining.service;
  
  import java.io.IOException;
  import java.net.URL;
  import java.net.URLConnection;
  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  
  import org.jdom.Document;
  import org.jdom.Element;
  import org.jdom.JDOMException;
  import org.jdom.input.SAXBuilder;
  import org.kuali.mobility.dining.entity.FoodItem;
  import org.kuali.mobility.dining.entity.Menu;
  
  public class DiningServiceImpl implements DiningService {
  	
  	private static org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(DiningServiceImpl.class);
  	
  	private Map<String, List<String>> diningUrls;
  	
  	@Override
  	public List<Menu> getMenus(String location) {
  		String url = getXmlUrl(location);
  		if (url != null) {
  			return parseUrl(url);
  		}
  		return null;
  	}
  	
  	private String getXmlUrl(String campusCode) {
  		String url = null;
  		List<String> urls = diningUrls.get(campusCode);
  		if (urls != null && urls.size() > 0) {
  			url = urls.get(0);
  		}
  		return url;
  	}
  	
  	@SuppressWarnings("unchecked")
  	private List<Menu> parseUrl(String url){
  		List<Menu> menus = new ArrayList<Menu>();
  		try {
  			// Set up formatters
  			SimpleDateFormat sdf = new SimpleDateFormat("MM-dd-yyyy");
  			// Process the XML	
  			Document doc = retrieveDocumentFromUrl(url, 5000, 5000);
  			Element root = doc.getRootElement();
  			List<Element> xmlMenus = root.getChildren("menu");
  			for (Iterator<Element> iterator = xmlMenus.iterator(); iterator.hasNext();) {
  				Element xmlMenu = iterator.next();
  				// Make the date format configurable
  				String dateStr = xmlMenu.getChildText("date");
  				Menu menu = new Menu();
  				try {
  					Date date = sdf.parse(dateStr);
  					menu.setDate(date);
  					List<Element> items = xmlMenu.getChildren("item");
  					for (Iterator<Element> itemItr = items.iterator(); itemItr.hasNext();) {
  						try {
  							Element xmlItem = itemItr.next();
  							String name = xmlItem.getChildText("name");
  							String priceStr = xmlItem.getChildText("price");
  							double price = Double.parseDouble(priceStr);
  							FoodItem item = new FoodItem(name, price);
  							menu.getItems().add(item);							
  						} catch (Exception e) {}
  					}
  					menus.add(menu);
  				} catch (ParseException e) {}
  			}
  		} catch (JDOMException e) {
  			LOG.error(e.getMessage(), e);
  		} catch (IOException e) {
  			LOG.error(e.getMessage(), e);
  		}
  		return menus;
  	}
  	
 	private Document retrieveDocumentFromUrl(String urlStr, int connectTimeout, int readTimeout) throws IOException, JDOMException {
 		SAXBuilder builder = new SAXBuilder();
 		Document doc = null;
 		URL urlObj = new URL(urlStr);
 		URLConnection urlConnection = urlObj.openConnection();
 		urlConnection.setConnectTimeout(connectTimeout);
 		urlConnection.setReadTimeout(readTimeout);
 		doc = builder.build(urlConnection.getInputStream());
 		return doc;
 	}
 
 	public Map<String, List<String>> getDiningUrls() {
 		return diningUrls;
 	}
 
 	public void setDiningUrls(Map<String, List<String>> diningUrls) {
 		this.diningUrls = diningUrls;
 	}
 
 }