package org.openslx.imagemaster.serverconnection;

import java.io.File;
import java.io.FileNotFoundException;
import java.nio.ByteBuffer;
import java.sql.SQLException;
import java.util.List;
import java.util.UUID;

import org.apache.log4j.Logger;
import org.openslx.bwlp.thrift.iface.ImagePublishData;
import org.openslx.bwlp.thrift.iface.TInvocationException;
import org.openslx.bwlp.thrift.iface.TransferInformation;
import org.openslx.filetransfer.util.ChunkStatus;
import org.openslx.filetransfer.util.FileChunk;
import org.openslx.filetransfer.util.IncomingTransferBase;
import org.openslx.imagemaster.Globals;
import org.openslx.imagemaster.db.mappers.DbImage;
import org.openslx.imagemaster.db.mappers.DbImageBlock;
import org.openslx.imagemaster.util.Util;
import org.openslx.util.ThriftUtil;

public class IncomingTransfer extends IncomingTransferBase
{

	private static final Logger LOGGER = Logger.getLogger( IncomingTransfer.class );

	private static final long MIN_FREE_SPACE_BYTES = FileChunk.CHUNK_SIZE * 10;

	private final String imageVersionId;

	private final TransferInformation transferInfo;

	public IncomingTransfer( ImagePublishData img, List<ByteBuffer> blockHashes, File absDestination, int plainPort, int sslPort )
			throws TInvocationException, FileNotFoundException
	{
		super( UUID.randomUUID().toString(), absDestination, img.fileSize, ThriftUtil.unwrapByteBufferList( blockHashes ) );
		this.imageVersionId = img.imageVersionId;
		this.transferInfo = new TransferInformation( getId(), plainPort, sslPort );
		// If the file already exists, see if any chunks are already complete
		if ( absDestination.exists() && absDestination.length() > 0 ) {
			try {
				List<Boolean> statusList = DbImageBlock.getMissingStatusList( img.imageVersionId );
				if ( !statusList.isEmpty() ) {
					getChunks().resumeFromStatusList( statusList, absDestination.length() );
					for ( int i = 0; i < 3; ++i ) {
						queueUnhashedChunk( false );
					}
				}
			} catch ( SQLException e ) {
			}
		}
	}

	@Override
	public String getRelativePath()
	{
		return Util.getRelativePath( getTmpFileName(), new File( Globals.getImageDir() ) );
	}

	@Override
	public synchronized void cancel()
	{
		super.cancel();
		getTmpFileName().delete();
	}

	@Override
	protected boolean hasEnoughFreeSpace()
	{
		long space = Globals.getImagePath().getUsableSpace();
		return space > MIN_FREE_SPACE_BYTES;
	}

	@Override
	protected boolean finishIncomingTransfer()
	{
		potentialFinishTime.set( System.currentTimeMillis() );
		try {
			DbImage.markValid( this.imageVersionId, true );
		} catch ( SQLException e ) {
			// Nothing to do
		}
		return true;
	}

	@Override
	public TransferInformation getTransferInfo()
	{
		return transferInfo;
	}

	@Override
	protected void chunkStatusChanged( FileChunk chunk )
	{
		if ( chunk.getFailCount() > 6 ) {
			cancel();
			LOGGER.warn( "Server is cancelling upload of Version " + imageVersionId
					+ ": Hash check for block " + chunk.getChunkIndex()
					+ " failed " + chunk.getFailCount()
					+ " times." );
		}
		ChunkStatus status = chunk.getStatus();
		if ( status == ChunkStatus.MISSING || status == ChunkStatus.COMPLETE ) {
			try {
				DbImageBlock.asyncUpdate( imageVersionId, chunk );
			} catch ( InterruptedException e ) {
				e.printStackTrace();
			}
		}
	}

	public Object getImageVersionId()
	{
		return imageVersionId;
	}

}