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.db.DbImage;

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)
							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;
			}
		}

	}
}