package org.openslx.imagemaster.serverconnection;

import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

import org.apache.log4j.Logger;
import org.openslx.imagemaster.crcchecker.CRCChecker;

/**
 * Class to schedule crc checks.
 */
public class CRCScheduler extends TimerTask
{

	private static Logger log = Logger.getLogger( CRCScheduler.class );

	@Override
	public void run()
	{
		log.debug( "Starting checks..." );
		List<UploadingImage> list = ImageProcessor.getImagesToCheck();
		log.debug( list );
		Iterator<UploadingImage> iter = list.iterator();
		while ( iter.hasNext() ) {
			UploadingImage image = iter.next();
			log.debug( "Checking blocks of " + image.getDbImage().imageName );
			CRCChecker crcChecker = new CRCChecker( image.getImageFile(), image.getCrcFile() );
			log.debug( "CRCFile is valid: " + crcChecker.hasValidCrcFile() );
			for ( int block = 0; block < image.getNumberOfBlocks(); block++ ) {
				if ( image.needsCheck( block ) ) {
					try {
						if ( crcChecker.checkBlock( block ) ) {
							image.setValid( block );
							log.debug( block + " was valid" );
						} else {
							image.setNeedsRequest( block );
							log.debug( block + " was NOT valid" );
						}
					} catch ( IOException e ) {
						// TODO: Handle that crc file or image file could not be read.
						// CRC file read error:	tell client to resend?
						// image file read error: tell server admin to check file permissions
						log.debug( "Error: " + e.getMessage() );
					}
				}
			}
			image.updateDb();
		}
		log.debug( "... done" );
	}

	public static void startScheduling()
	{
		Timer timer = new Timer( "CRCScheduler" );

		// start now and fire every 60 s
		timer.schedule( new CRCScheduler(), 0, 60000L );
	}

}