package org.openslx.satellitedaemon.filetransfer;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.security.InvalidKeyException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.SignatureException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import java.util.List;

import org.apache.log4j.Logger;
import org.apache.thrift.TException;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TFramedTransport;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.transport.TTransport;
import org.apache.thrift.transport.TTransportException;
import org.openslx.imagemaster.crcchecker.CrcFile;
import org.openslx.imagemaster.thrift.iface.AuthorizationError;
import org.openslx.imagemaster.thrift.iface.AuthorizationException;
import org.openslx.imagemaster.thrift.iface.DownloadData;
import org.openslx.imagemaster.thrift.iface.ImageData;
import org.openslx.imagemaster.thrift.iface.ImageDataError;
import org.openslx.imagemaster.thrift.iface.ImageDataException;
import org.openslx.imagemaster.thrift.iface.ImageServer;
import org.openslx.imagemaster.thrift.iface.ServerAuthenticationException;
import org.openslx.imagemaster.thrift.iface.ServerSessionData;
import org.openslx.imagemaster.thrift.iface.UploadError;
import org.openslx.imagemaster.thrift.iface.UploadException;
import org.openslx.imagemaster.thrift.iface.UploadData;
import org.openslx.satellitedaemon.Globals;
import org.openslx.satellitedaemon.db.DbImage;
import org.openslx.satellitedaemon.db.DbImage.Status;
import org.openslx.satellitedaemon.util.EncryptWithServerIdPublicKey;

// TODO: Handle all the auto-generated catch blocks in a meaningful way

/***********************************************************************************************/
/**
 * Handles the authentication with the Satellite Server and sends the
 * FILTRANSFERCredentials, which are necessary for the upload of the image.
 */
public class ThriftConnection {
	private static ImageServer.Client client = null;
	private static ServerSessionData sSD = null;
	private static Logger log = Logger.getLogger(ThriftConnection.class);
	private static CrcFile crc = null;
	

	/***********************************************************************************************/
	/**
	 * Method for getting UploadeInfos
	 * 
	 * when the CRCsum need to be transfered. The method calls getConnection()
	 * to check if the connection is ok and to get the ServerSessionData. If
	 * connection is ok, it calls submitImage with CRCsum in List<Integer>.
	 * 
	 * @return returns 'null' if there is a problem.
	 */
	public static UploadData getUploadInfos(ImageData imDat, String filename) {
		ImageServer.Client theClient = null;
		try {
			theClient = getConnection();
			if (theClient == null) {
				log.error("Client was null!");
				return null;
			}
			
			crc = new CrcFile(filename);
			log.info("Made CRCFile from " + filename);
			log.info("crc.getCrcSums( ).size = " + crc.getCrcSums().size());
			// log.info( "crc.getMasterSum() : " + crc.getMasterSum() );
			// for ( int i = 0; i < crc.getCrcSums().size() - 1; i++ ) {
			// log.info( "crc.getCRCSum() : " + crc.getCRCSum( i ) );
			// }
			return theClient
					.submitImage(sSD.sessionId, imDat, crc.getCrcSums());
		} catch (ImageDataException e) {
			if (e.isSetNumber()
					&& e.getNumber().equals(ImageDataError.INVALID_DATA)) {
				e.printStackTrace();
				// Data in the db is not valid
				// TODO: add e.message into DB;
			} else {
				e.printStackTrace();
			}
		} catch (UploadException e) {
			if (e.isSetNumber()
					&& e.getNumber().equals(UploadError.BROKEN_BLOCK)) {
				// A Block was transmitted 20 times unsuccessfully.
				// TODO: Mark the Image as corrupted.
			} else if (e.getNumber().equals(UploadError.INVALID_CRC)) {
				// The CRC sum contained errors
				try {
					crc = new CrcFile(filename);
				} catch (IOException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
				if (!crc.isValid()) {
					// TODO: Mark CRC-file as corrupted.
				}
			} else {
				e.printStackTrace();
			}
		} catch (AuthorizationException e) {
			if (e.isSetNumber()
					&& e.getNumber().equals(
							AuthorizationError.NOT_AUTHENTICATED)) {
				// SessionID is not valid
				// TODO: Code for new SSID
			} else if (e.getNumber().equals(AuthorizationError.NO_PERMISSION)) {
				// not yet implemented.

			} else {
				e.printStackTrace();
			}
		} catch (UnrecoverableKeyException e) {
			log.error("UnrecoverableKeyException");
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			log.error("InvalidKeyException");
			e.printStackTrace();
		} catch (NoSuchAlgorithmException e) {
			log.error("NoSuchAlgorithmException");
			e.printStackTrace();
		} catch (CertificateException e) {
			log.error("CertificateException");
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			log.error("FileNotFoundException");
			e.printStackTrace();
		} catch (KeyStoreException e) {
			log.error("KeyStoreException");
			e.printStackTrace();
		} catch (SignatureException e) {
			log.error("SignatureException");
			e.printStackTrace();
		} catch (IOException e) {
			log.error("IOException");
			e.printStackTrace();
		} catch (TException e) {
			log.error("TException");
			e.printStackTrace();
		}
		return null;
	}

	/***********************************************************************************************/
	/**
	 * Method for getting DonwloadInfos. Calls getConnection if client was null.
	 * You need to spezifie all Blocks you want to have in an List.
	 * 
	 * @return returns 'null' if there is a problem.
	 */
	public static DownloadData getDownloadInfos(DbImage imDat) {
		ImageServer.Client theClient = null;
		try {
			theClient = getConnection();
			if (theClient == null) {
				log.error("Client was null!");
				return null;
			}
			return theClient.getImage(imDat.guid, sSD.sessionId);
		} catch (ImageDataException e) {
			if (e.isSetNumber()
					&& e.getNumber().equals(ImageDataError.INVALID_DATA)) {
				// Data in the db is not valid
				// TODO: add e.message into DB;
			} else if (e.getNumber().equals(ImageDataError.UNKNOWN_IMAGE)) {
				// The image requested is not known.
				// TODO: change field image_syncMode, so the image is not asked
				// for again.
				// For now just changed status of image. Currently no possibility
				// for creating new useful state in DB. (Offenburg)
				log.info("Image not known. For skipping next time, mark as only_local.");
				imDat.updateStatus(Status.only_local);
				// Plus add a note in some way to mark as unknown by Server
			} else {
				e.printStackTrace();
			}
		} catch (AuthorizationException e) {
			if (e.isSetNumber()
					&& e.getNumber().equals(
							AuthorizationError.NOT_AUTHENTICATED)) {
				// SessionID is not valid
				// TODO: Code for new SSID
			} else if (e.getNumber().equals(AuthorizationError.NO_PERMISSION)) {

			} else {
				e.printStackTrace();
			}
		} catch (UnrecoverableKeyException e) {
			log.error("UnrecoverableKeyException");
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			log.error("InvalidKeyException");
			e.printStackTrace();
		} catch (NoSuchAlgorithmException e) {
			log.error("NoSuchAlgorithmException");
			e.printStackTrace();
		} catch (CertificateException e) {
			log.error("CertificateException");
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			log.error("FileNotFoundException");
			e.printStackTrace();
		} catch (KeyStoreException e) {
			log.error("KeyStoreException");
			e.printStackTrace();
		} catch (SignatureException e) {
			log.error("SignatureException");
			e.printStackTrace();
		} catch (IOException e) {
			log.error("IOException");
			e.printStackTrace();
		} catch (TException e) {
			log.error("TException");
			e.printStackTrace();
		}
		return null;
	}

	/***********************************************************************************************/
	/**
	 * This method checks if there is already a working connection. If not,
	 * newClient() establishes one. Also it does the Authentication if not done
	 * yet.
	 * 
	 * @return returns the client if successful.
	 */
	private static ImageServer.Client getConnection()
			throws UnrecoverableKeyException, NoSuchAlgorithmException,
			CertificateException, FileNotFoundException, KeyStoreException,
			IOException, InvalidKeyException, SignatureException {
		ImageServer.Client theClient = null;
		boolean isAuthenticated = false;
		if (client == null) {
			log.info("The global client was null. Making a new client ...");
			theClient = newClient();
			if (theClient == null) {
				log.debug("ThriftConnection: The client was null after newClient()");
				return null;
			}
		} else {
			log.info("The global Client was already used. Setting isAuthenticated = true.");
			theClient = client;
			isAuthenticated = true;
		}
		// here the client was already used so we are just assuming that the client is still
		// authenticated. Should be checked with the ping() method.
		// try {
		// isAuthenticated = theClient.ping();
		// } catch ( TException x ) {
		// theClient = newClient();
		// if ( theClient == null ) {
		// return null;
		// }
		// }
		if (!isAuthenticated) {
			log.info("ThriftConnection: Client not yet Authenticated. Trying...");
			String toEncrypt;
			if (theClient == null) {
				log.debug("The client was null");
				return null;
			}
			try {
				toEncrypt = theClient.startServerAuthentication(Globals
						.getOrganizationName());
				log.info("The random String we want to encrypt: " + toEncrypt);
				log.info("Length of the random String : " + toEncrypt.length());
				EncryptWithServerIdPublicKey rse = new EncryptWithServerIdPublicKey(
						Globals.getThriftKeystoreAlias(),
						Globals.getThriftKeystorePassword(),
						Globals.getThriftKeystorePath());
				byte[] byteArray = rse.encryptString(toEncrypt);
				log.info( "Length of the byteArray of the random string after encryption :" + byteArray.length );
				ByteBuffer b = ByteBuffer.wrap( byteArray );
				log.info( "Length of the byteBuffer after encryption :" + b.remaining() );
				sSD = theClient.serverAuthenticate(
						Globals.getOrganizationName(),
						ByteBuffer.wrap(byteArray));
			} catch (ServerAuthenticationException e) {
				log.error("ThriftConnection: ServerAuthenticationException: Server Authetication was not sucessful.");
				e.printStackTrace();
				return null;
			} catch (TException e) {
				log.error("ThriftConnection: TException: Server Authetication was not sucessful.");
				e.printStackTrace();
				return null;
			}
			log.info("is Authenticated.");

		}
		client = theClient;
		return theClient;
	}

	/***********************************************************************************************/
	/**
	 * Method for creating a new Client for Thrift communication.
	 * 
	 * @throws IOException
	 */
	private static ImageServer.Client newClient() throws IOException {
		ImageServer.Client newClient = null;
		try {
			TTransport transport = new TFramedTransport( new TSocket(
					Globals.getMasterserverHost(),
					Globals.getThriftPort()));
			transport.open();
			TProtocol protocol = new TBinaryProtocol(transport);
			newClient = new ImageServer.Client(protocol);
			log.debug("ThriftConnection: Made a new Client");
		} catch (TTransportException tte) {
			log.error("Transport could not be opened. Couldn't create new client.");
			tte.printStackTrace();
			return null;
		}
		return newClient;
	}
}