/**
    * 
    */
   package com.buckosoft.PicMan.business.util;
   
   import java.awt.image.BufferedImage;
   import java.io.ByteArrayOutputStream;
   import java.util.Date;
   import java.util.Iterator;
  import java.util.List;
  
  import javax.imageio.ImageIO;
  import javax.imageio.ImageWriter;
  import javax.imageio.stream.ImageOutputStream;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  import com.buckosoft.PicMan.business.PicManFacade;
  import com.buckosoft.PicMan.domain.JobLogEntry;
  import com.buckosoft.PicMan.domain.Pic;
  import com.buckosoft.PicMan.image.PicReader;
  
  /**
   * @author dick
   *
   */
  public class MD5SumUpdater {
  	protected final static Log log = LogFactory.getLog(MD5SumUpdater.class);
  
  	private	int picProcessing = 0;
  	private	PicManFacade	pmf;
  
  	/** Set the reference to the PicMan API.
  	 * @param pmf The PicManFacade
  	 */
  	public	void setPicMan(PicManFacade pmf) {
  		this.pmf = pmf;
  	}
  
  	/** Which ordinal picture are we working on?
  	 * This is just a status indicator
  	 * @return the picProcessing
  	 */
  	public int getPicProcessing() {
  		return picProcessing;
  	}
  
  	/** Entry point from BatchManager to run the job
  	 */
  	public void run() {
  		List<Pic> pics = pmf.getDB().getPics();
  		Iterator<Pic> iter = pics.iterator();
  		int	picCount = pics.size();
  		picProcessing = 0;
  		JobLogEntry jle = new JobLogEntry();
  		jle.setType(JobLogEntry.MD5SUM);
  		pmf.addJobToLog(jle);
  		Pic pic;
  		while (iter.hasNext()) {
  			picProcessing++;
  			int cp = picProcessing * 100 / picCount;
  			jle.setName("" + cp + "%");
  			pic = iter.next();
  			calculateMD5Sum(pmf, pic);
  			//log.info("md5sum for " + pic.getName() + " = " + pic.getMd5());
  			pmf.getDB().updatePic(pic);
  		}
  		jle.setEndTime(new Date());
  	}
  	
  	public static void calculateMD5Sum(PicManFacade pmf, Pic pic) {
  	
  		//FileInputStream fis;
  		String md5;
  		//String fullPath = null;
  		try {
  			BufferedImage bi = pmf.getPicReader().readPic(pic);
  			ByteArrayOutputStream out = new ByteArrayOutputStream();
  			ImageOutputStream ios = ImageIO.createImageOutputStream(out);
  			Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");
  			ImageWriter writer = (ImageWriter)writers.next();
  			writer.setOutput(ios);
  			writer.write(bi);
  			byte[] data = out.toByteArray();
  			md5 = org.apache.commons.codec.digest.DigestUtils.md5Hex(data);
  			
  			//fullPath = PicReader.getFullPath(pmf, pic);
  //			fis = new FileInputStream(new File(fullPath));
  //			md5 = org.apache.commons.codec.digest.DigestUtils.md5Hex(fis);
  //			fis.close();
  		} catch (Exception e) {
  			// TODO Auto-generated catch block
  			//e.printStackTrace();
  			log.warn("md5 file error on " + PicReader.getFullPath(pmf, pic));
  			pic.setMd5(0);
  			return;
  		}
  		long l = Long.parseLong(md5.substring(0, 8), 16);
 		pic.setMd5(l);
 		
 		//byte[] m = org.apache.commons.codec.digest.DigestUtils.md5(fis);
 		//long l = m[0] + m[1]<<8 + m[2]<<16 + m[3]<<24 + m[4]<<32 + m[5]<<40 + m[6]<<48 + m[7]<<56;
 /*		MessageDigest md = null;
 		try {
 			md = MessageDigest.getInstance("MD5");
 		} catch (NoSuchAlgorithmException e) {
 			log.error(e);
 			return;
 		}
 		InputStream is = null;
 		try {
 			is = Files.newInputStream(Paths.get("file.txt"));
 		} catch (IOException e) {
 			log.error(e);
 			return;
 		}
 		DigestInputStream dis = new DigestInputStream(is, md);
 		 Read stream to EOF as normal... 
 
 		byte[] digest = md.digest();		
 */	}
 }