/**
    * Copyright 2005-2013 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.opensource.org/licenses/ecl2.php
    *
   * 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.rice.edl.impl.components;
  
  import org.apache.commons.lang.StringUtils;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.kuali.rice.edl.impl.EDLContext;
  import org.kuali.rice.edl.impl.EDLModelComponent;
  import org.kuali.rice.edl.impl.EDLXmlUtils;
  import org.kuali.rice.edl.impl.RequestParser;
  import org.w3c.dom.Document;
  import org.w3c.dom.Element;
  
  /**
   * Handles setting the request browser type in the EDL XML.
   *
   * @author Kuali Rice Team (kuali-rice@googlegroups.com)
   *
   */
  public class BrowserHandler implements EDLModelComponent {
  
  	private static final Log LOG = LogFactory.getLog(BrowserHandler.class);
  	
  	public static final String BROWSER_EL = "requestBrowser";
  	
  	public void updateDOM(Document dom, Element configElement, EDLContext edlContext) {
  	    String userAgent = browserString(edlContext.getRequestParser());
  	    setBrowser(dom, uaConvert(userAgent));
  	}
  	
  	/**
  	 * get user-agent header
  	 */
  	private String browserString(RequestParser requestParser) {
  	    return requestParser.getRequest().getHeader("User-Agent");
  	}
  
  	private void setBrowser(Document dom, String bStr) {
  	    if (!StringUtils.isBlank(bStr)) {
  	    	Element currentPageElement = EDLXmlUtils.getOrCreateChildElement(dom.getDocumentElement(), BROWSER_EL, true);
  	    	currentPageElement.appendChild(dom.createTextNode(bStr));
  	    	if (LOG.isDebugEnabled()) {
  	    		LOG.debug("Appended" + bStr + " to XML field " + currentPageElement.getNodeName());
  	    	}
  	    }
  	}
  	
  	private String uaConvert(String userAgent){
  	    String res = userAgent;
  	    int ie = userAgent.indexOf("MSIE");
  	    int ff = userAgent.indexOf("Firefox/");
  	    int saf = userAgent.indexOf("Safari/");
  	    int chr = userAgent.indexOf("Chrome/");
  	    if(ie>0){
  		res = "InternetExplorer";
  	    }else if(ff > 0){
  		res = "Firefox";
  	    }else if(saf > 0 && chr < 0){
  		res = "Safari";
  	    }else if(saf > 0 && chr > 0){
  	    res = "Chrome";
  	    }else{
  		res = "Other";
  	    }	    
  	    return res;
  	}
  	
  
  	    
  
  }