/******************************************************************************
    * MosaicDisplayAjaxController.java - The Spring controller for the Mosaic Display page AJAX calls
    * 
    * PicMan - The BuckoSoft Picture Manager in Java
    * Copyright(c) 2007 - Dick Balaska
    * 
    */
   package com.buckosoft.PicMan.web;
   
  import java.io.IOException;
  import java.io.OutputStream;
  import java.io.UnsupportedEncodingException;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.dom4j.Document;
  import org.dom4j.io.OutputFormat;
  import org.dom4j.io.XMLWriter;
  import org.springframework.web.servlet.ModelAndView;
  import org.springframework.web.servlet.mvc.Controller;
  
  import com.buckosoft.BSAccount.web.BSAccountPageController;
  import com.buckosoft.BSAccount.web.BSAccountUserWebSession;
  import com.buckosoft.PicMan.business.PicManFacade;
  import com.buckosoft.PicMan.dom.MosaicManDom;
  import com.buckosoft.PicMan.domain.User;
  
  /** The Spring controller for the Mosaic Display page AJAX calls
   * @author Dick Balaska
   * @since 2007/12/28
   * @see <a href="http://cvs.buckosoft.com/Projects/java/PicMan/PicMan/src/com/buckosoft/PicMan/web/MosaicDisplayAjaxController.java">MosaicDisplayAjaxController.java</a>
   */
  public class MosaicDisplayAjaxController extends BSAccountPageController implements	Controller {
  	private final static boolean DEBUG		= false;
  	private final static boolean DEBUGLOTS	= false;
  	protected final Log logger = LogFactory.getLog(getClass());
  
  	private PicManFacade pmf;
  
  	/** Set the reference to the PicMan API.
  	 * @param pmf The PicManFacade
  	 */
  	public void setPicMan(PicManFacade pmf) { this.pmf = pmf; }
  
  
  	/** Spring standard http request handler, outputs a {@link MosaicManDom}
  	 * @param request The http request
  	 * @param response The http response
  	 * @return null
  	 */ 
  	public ModelAndView handleRequest(HttpServletRequest request,
  			HttpServletResponse response) {
  		if (DEBUGLOTS)
  			logger.info("XML MosaicDisplay Request");
  
  		response.setContentType("text/xml");
  		response.addHeader("Cache-Control", "max-age=0");
  		response.addHeader("Cache-Control", "no-cache");
  		response.addHeader("expires", "0");
  		response.addHeader("Expires", "Tue, 01 Jan 1980 1:00:00 GMT");
  		response.addHeader("Pragma", "no-cache");
  
  		User user = null;
  		BSAccountUserWebSession userWebSession = this.bsAccountMan.getUserWebSession(request);
  		if (userWebSession != null) 
  			user = (User)userWebSession.getUser();
  		String outputMosaic = request.getParameter("outputMosaic");
  		if (outputMosaic != null) {
  			if (DEBUG)
  				logger.info("OutputMosaic");
  			pmf.getMosaicMan().outputMosaicFile();
  		}
  		try {
  			Document dom = MosaicManDom.createDocument(pmf, user);
  			OutputStream stream = response.getOutputStream();
  			OutputFormat outformat = OutputFormat.createPrettyPrint();
  			outformat.setEncoding("ISO-8859-1");
  			XMLWriter writer = new XMLWriter(stream, outformat);
  			writer.write(dom);
  			writer.flush();
  		} catch (UnsupportedEncodingException e) {
  			logger.warn(e);
  		} catch (IOException e) {
  			logger.warn(e);
  		}
  		return null;
  	}
  }