package org.openslx.satellitedaemon.filetransfer;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;
import org.openslx.filetransfer.Downloader;
import org.openslx.filetransfer.FileRange;
import org.openslx.filetransfer.WantRangeCallback;
import org.openslx.imagemaster.thrift.iface.DownloadData;
import org.openslx.satellitedaemon.Globals;
import org.openslx.satellitedaemon.Identity;
import org.openslx.satellitedaemon.db.DbImage;
import org.openslx.satellitedaemon.db.DbImage.Status;

public class FileDownloadWorker implements Runnable
{
	private static Logger log = Logger.getLogger( FileDownloadWorker.class );

	@Override
	public void run()
	{
		while ( true ) {
			List<DbImage> imageList = DbImage.getAllMarkedForDownload();
			log.info( "imageList Contains " + imageList.size() + " items." );
			for ( final DbImage image : imageList ) {

				List<Integer> range = new ArrayList<Integer>();
				for ( long i = 0; i < ( image.fileSize / Globals.BLOCKSIZE ); i++ ) {
					range.add( (int)i );
				}
				DownloadData downInfos = ThriftConnection.getDownloadInfos( image );
				if ( downInfos == null ) {
					log.error( "The DownloadInfos returned by ThriftConnection class are null" );
					continue;
				}

				// create new instance of Downloader.
				Downloader d;
				try {
					d = new Downloader( Globals.getMasterserverHost(),
							downInfos.port, Globals.getMasterServerSslContext(), downInfos.token );
				} catch ( IOException e ) {
					e.printStackTrace();
					continue;
				}

				// start downloading process.
				d.download( Globals.getImageFolder() + "/" + image.path, new WantRangeCallback() {
					long pos = 0;
					long size = image.fileSize;

					@Override
					public FileRange get()
					{
						// get start of range.
						if ( pos >= size ) {
							log.debug( "Download completed." );
							image.updateStatus( Status.successfully_decentralized );
							return null;
						}

						long startOfRange = pos;
						long endOfRange = Math.min( pos + Globals.BLOCKSIZE, image.fileSize );
						FileRange range = new FileRange( startOfRange, endOfRange );
						pos += Globals.BLOCKSIZE;
						return range;
					}
				} );
			}
			try {
				Thread.sleep( 5 * 60 * 1000 );
			} catch ( InterruptedException e ) {
				Thread.currentThread().interrupt();
				return;
			}
		}

	}
}