/******************************************************************************
    * 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);
 	}
 
 }