package org.openslx.satellitedaemon.ftp;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.util.List;
import java.util.UUID;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;

import org.apache.log4j.Logger;
import org.openslx.filetransfer.Uploader;
import org.openslx.imagemaster.thrift.iface.ImageData;
import org.openslx.imagemaster.thrift.iface.UploadInfos;
import org.openslx.satellitedaemon.Globals;
import org.openslx.satellitedaemon.Globals.PropString;
import org.openslx.satellitedaemon.db.DbImage;

// TODO: Rename all this FTP* Stuff (also the constants in Globals) now that we're not using ftp anymore 

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

	@Override
	public void run()
	{
		while ( true ) {
			// This List contains all Images in the Database that should be uploaded.
			List<DbImage> imageList = DbImage.getAllMarkedForUpload();
			log.info( "FtpUploadWorker: imageList Contains " + imageList.size() + " items." );

			// Upload one Image after the other.
			for ( DbImage image : imageList ) {
				// TODO: still some fields for ImageData, which i can't fill with info from DbImage.
//				ImageData imDat = new ImageData( image.guid, image.rid,
//						image.name, System.currentTimeMillis(), System.currentTimeMillis(), image.creator, "anyThing",
//						true, false, "best", "theVeryBest", image.fileSize );
				
				ImageData imDat = new ImageData( UUID.randomUUID().toString(), image.rid,
						image.name, System.currentTimeMillis(), System.currentTimeMillis(), image.creator, "anyThing",
						true, false, "best", "theVeryBest", image.fileSize );
				char[] passphrase = Globals.getPropertyString( PropString.FTPSKEYSTOREPWD ).toCharArray();
				KeyStore keystore;
				try {

					// All the necessary KeyStore handling for the "context"-item.
					// TODO: Don't do this again and again for every image, but once before the loop (or in the constructor)
					// Or better yet in a central spot, as the downloadworker needs the context too. Maybe something like Globals.getMasterServerSslContext()
					keystore = KeyStore.getInstance( "JKS" );
					keystore.load( new FileInputStream( Globals.getPropertyString( PropString.FTPSKEYSTOREPATH ) ), passphrase );
					TrustManagerFactory tmf = TrustManagerFactory.getInstance( TrustManagerFactory.getDefaultAlgorithm() );
					tmf.init( keystore );
					SSLContext context = SSLContext.getInstance( "SSLv3" );
					TrustManager[] trustManagers = tmf.getTrustManagers();
					context.init( null, trustManagers, null );

					// uploadInfo and ThriftAuthentication
					String crcPath = image.path.concat( ".crc" );
					UploadInfos upInfos = ThriftConnection.getUploadInfos( imDat, crcPath );
					if ( upInfos == null ) {
						log.error( "The UploadInfos returned by ThriftConnection Class are null" );

						return;

						// FIXME: And then..? If you just continue, you'll run into a null pointer exception

					}
					log.info( "Got upInfos. Trying to create Uploader with token: " + upInfos.token );

					// creating the uploader with the "context"-item.
					Uploader u = new Uploader( Globals.getPropertyString( PropString.FTPSERVERIP ), upInfos.port, context );
					u.sendToken( upInfos.token );

					// continue sending Blocks until getMissingBlocks is empty.

					

					while ( !upInfos.getMissingBlocks().isEmpty() ) {
						// Send all Blocks from upInfos.getMissingBlocks() in ranges.
						List<Integer> blocks = upInfos.getMissingBlocks();
						int start = 0;
						for ( int i = 0; i < blocks.size() - 1; i++ ) {
							if ( blocks.get( i ) != ( blocks.get( i + 1 ) - 1 ) ) { // TODO: !? u.sendRange expects byte values, upInfos contains block indexes (16MiB)
								u.sendRange( start, i );
								u.sendFile( image.path );
								start = i + 1;
							}
							if ( i == blocks.size() - 2 ) { // TODO: !=
								u.sendRange( start, blocks.size() - 1 );
								u.sendFile( image.path );
							}
						}
					}
					// FIXME: Should be inside loop, otherwise you'll only ever upload the first 20 blocks
					upInfos = ThriftConnection.getUploadInfos( imDat );


					// TODO: Use more local try/catch-blocks, not a big one around everything, so you know what exactly caused the exception
					// and can handle it properly. There are roughly 3 types of error/exception you can encounter:
					// 1) Expected exception: Something you expect to go wrong, so you handle it in the catch block and let the code flow continue
					// 2) Minor exception: Something went wrong and you can't continue trying to upload that image. Try to clean things up that
					//    you already did (like opening a file, opening a network connection) and then continue with the next image
					// 3) Major messup: Something went wrong that will prevent the whole application from continuing to work. Try to finish or cancel
					//    any operation going on in your application and then exit (and don't forget to log meaningful information about the error)
					// Basically all those empty catch blocks below should be moved up and filled with logic.
				} catch ( NoSuchAlgorithmException e ) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch ( CertificateException e ) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch ( FileNotFoundException e ) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch ( IOException e ) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch ( KeyStoreException e ) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch ( KeyManagementException e ) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}

			}
			try {
				Thread.sleep( 5 * 60 * 1000 );
				//				Thread.sleep( 1000 );
			} catch ( InterruptedException e ) {
				Thread.currentThread().interrupt();
				return;
			}
		}

	}
}