package org.openslx.satellitedaemon.ftp;

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 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.TSocket;
import org.apache.thrift.transport.TTransport;
import org.openslx.imagemaster.crcchecker.CRCFile;
import org.openslx.imagemaster.thrift.iface.DownloadInfos;
import org.openslx.imagemaster.thrift.iface.ImageData;
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.UploadInfos;
import org.openslx.satellitedaemon.Globals;
import org.openslx.satellitedaemon.Globals.PropInt;
import org.openslx.satellitedaemon.Globals.PropString;
import org.openslx.satellitedaemon.db.DbImage;
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 FtpCredentials, 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 
	 * 
	 * !! on the first Call !! 
	 * 
	 * 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 UploadInfos getUploadInfos( ImageData imDat, String filename )
	{
		ImageServer.Client theClient = null;
		try {
			theClient = getConnection();
			if ( theClient == null ) {
				log.error( "Client was null!" );
				return null;
			}
			// .submitImage needs the List<Integer>  from CRCFile.getCRCs() only 
			// on the first time called. null afterwards.
			log.info( "First call of submitImage following..." );
			crc = new CRCFile(filename);
			log.info( "Made CRCFile from " + filename );
			return theClient.submitImage( sSD.sessionId, imDat, crc.getCrcSums() );
		} catch ( TException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch ( UnrecoverableKeyException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch ( InvalidKeyException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 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 ( KeyStoreException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch ( SignatureException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch ( IOException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
	
	/**
	 * Method for getting UploadeInfos when CRCsum was already transfered on first call.
	 * The method calls getConnection() to check if the connection is ok 
	 * and to get the ServerSessionData. If connection is ok, it calls 
	 * submitImage with sSD.sessionId, imDat and !!null!!
	 * @return returns 'null' if there is a problem.
	 */
	public static UploadInfos getUploadInfos( ImageData imDat )
	{
		ImageServer.Client theClient = null;
		try {
			theClient = getConnection();
			if ( theClient == null ) {
				log.error( "Client was null!" );
				return null;
			}
			// .submitImage needs the List<Integer>  from CRCFile.getCRCs() only 
			// on the first time called. null afterwards.
			return theClient.submitImage( sSD.sessionId, imDat, crc.getCrcSums());
		} catch ( TException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch ( UnrecoverableKeyException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch ( InvalidKeyException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 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 ( KeyStoreException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch ( SignatureException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch ( IOException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
	
	/**
	 * The method calls getConnection() to check if the connection is ok 
	 * and to get the DownloadeInfos. If connection is ok, it returns ftpCredential.
	 * 
	 * @return returns 'null' if there is a problem.
	 */
	public static DownloadInfos 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 ( TException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch ( UnrecoverableKeyException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch ( InvalidKeyException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 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 ( KeyStoreException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch ( SignatureException e ) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch ( IOException e ) {
			// TODO Auto-generated catch block
			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;
		}
		//		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.getPropertyString( PropString.THRIFTORGANIZATIONNAME) );
				log.info( "The random String we want to encrypt: " + toEncrypt );
				EncryptWithServerIdPublicKey rse = new EncryptWithServerIdPublicKey( Globals.getPropertyString( PropString.RNDSTRINGENCRYPTALIAS ),
						Globals.getPropertyString( PropString.RNDSTRINGENCRYPTPASSWORD ),
						Globals.getPropertyString( PropString.RNDSTRINGENCRYPTPATH ) );
				byte[] byteArray = rse.encryptString( toEncrypt );
				sSD = theClient.serverAuthenticate(
						Globals.getPropertyString( PropString.THRIFTORGANIZATIONNAME), 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;
	}

	private static ImageServer.Client newClient()
	{
		ImageServer.Client newClient = null;
		try {
			TTransport transport;							
			transport = new TSocket( Globals.getPropertyString( PropString.FTPSERVERIP ), Globals.getPropertyInt( PropInt.THRIFTPORT ) );
			transport.open();
			TProtocol protocol = new TBinaryProtocol( transport );
			newClient = new ImageServer.Client( protocol );
			log.debug( "ThriftConnection: Made a new Client" );
		} catch ( TException x ) {
			log.error( "ThriftConnection coudn't create new client." );
			x.printStackTrace();
			return null;
		}
		return newClient;
	}
}