/******************************************************************************

  * MosaicAnalysePicController.java - A Spring controller for Mosaic Analysis, dumps Pic bits

  * 

  * PicMan - The BuckoSoft Picture Manager in Java

  * Copyright(c) 2008 - Dick Balaska

  * 

  */

 package com.buckosoft.PicMan.web;

 import java.awt.image.BufferedImage;

 import java.io.IOException;

 import java.util.Iterator;

 import javax.imageio.ImageIO;

 import javax.imageio.ImageWriter;

 import javax.imageio.stream.ImageOutputStream;

 import javax.servlet.ServletException;

 import javax.servlet.ServletOutputStream;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import org.springframework.web.servlet.ModelAndView;

 import com.buckosoft.BSAccount.web.BSAccountPageController;

 import com.buckosoft.PicMan.business.PicManFacade;

 import com.buckosoft.PicMan.db.DatabaseFacade;

 import com.buckosoft.PicMan.domain.Mosaic;

 import com.buckosoft.PicMan.domain.Pic;

 /** The Spring controller to display some analysis of a Mosaic

  * @author Dick Balaska

  * @since 2008/06/02

  * @see <a href="http://cvs.buckosoft.com/Projects/java/PicMan/PicMan/src/com/buckosoft/PicMan/web/MosaicAnalysePicController.java">MosaicAnalysePicController.java</a>

  */

 public class MosaicAnalysePicController extends BSAccountPageController {

 //        private final static boolean DEBUG = true;

         protected final Log logger = LogFactory.getLog(getClass());

         private PicManFacade pmf;

         private DatabaseFacade dbf;

         /** Set the reference to the PicMan API.

          * @param pmf The PicManFacade

          */

         public void setPicMan(PicManFacade pmf) { this.pmf = pmf; }

 //        public PicManFacade getPicMan() { return(pmf); }

         /** Set the reference to the PicMan Database

          * @param dbf The DatabaseFacade

          */

         public void setDatabase(DatabaseFacade dbf) { this.dbf = dbf; }

 //        public DatabaseFacade getDatabase() { return(dbf); }

         private        Pic                                masterPic = null;

         private        int                                masterMid = 0;

         private        BufferedImage        bi = null;

         /** Output a fragment of the Mosaic Master as a jpg. <br>

          * url parameters: <br>

          * x= the x coordinate of the master <br>

          * y= the y coordinate of the master <br>

          * w= the width to output 

          * h= the height to output

          * mid= the Mosaic ID.  Tells us which Master to use. 

          */

         public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response)

                         throws ServletException, IOException {

                 String x_ = request.getParameter("x");

                 String y_ = request.getParameter("y");

                 String w_ = request.getParameter("w");

                 String h_ = request.getParameter("h");

                 String mid_ = request.getParameter("mid");

                 int        x = Integer.parseInt(x_);

                 int        y = Integer.parseInt(y_);

                 int        w = Integer.parseInt(w_);

                 int        h = Integer.parseInt(h_);

                 int        mid = Integer.parseInt(mid_);

                 if (mid != masterMid || bi == null) {

                         Mosaic mosaic = dbf.getMosaic(mid);

                         masterMid = mid;

                         if (masterPic == null || !mosaic.getMasterPic().equals(masterPic.getName())) {

                                 masterPic = dbf.getPic(mosaic.getMasterPic());

                                 bi = pmf.getPicReader().readPic(masterPic);

                         }

                 }

                 if (x + w > bi.getWidth())

                         w = bi.getWidth() - x;

                 if (y + h > bi.getHeight())

                         h = bi.getHeight() - y;

                 BufferedImage tile = null;

                 try {

                         tile = bi.getSubimage(x, y, w, h);

                 } catch (Exception e) {

                         String s = "Failed to create subimage: x/y = " + x + "/" + y + " w/h = " + w + "/" + h;

                         Exception e1 = new Exception(s, e);

                         logger.error(e1);

                         pmf.addError(e1);

                         return(null);

                 }

                 response.setContentType("image/jpeg");

                 ServletOutputStream sos = response.getOutputStream();

                 ImageOutputStream ios = ImageIO.createImageOutputStream(sos);

                 Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");

                 ImageWriter writer = (ImageWriter)writers.next();

                 writer.setOutput(ios);

                 writer.write(tile);

                 return(null);

         }

 }