package org.openslx.imagemaster.serverconnection;

import java.sql.Timestamp;

import org.apache.log4j.Logger;
import org.openslx.imagemaster.db.DbImage;

/**
 * Helper class for ImageProcessor to save some infos about the images in the process list.
 */
public class UploadingImage
{

	public static final Logger log = Logger.getLogger( UploadingImage.class );
	/**
	 * Token for the satellite.
	 */
	private String token;
	/**
	 * The status list of the blocks.
	 * x = 0 block is missing
	 * x = 200 block arrived and is valid
	 * x > 0 block is invalid and was transmitted x times (needs request)
	 * x < 0 block is invalid and was transmitted x times (needs check)
	 */
	private int[] blockStatus = null;
	public static final int valid = 200;
	public static final int missing = 0;
	private Timestamp ts; // when did the server something for the last time
	private DbImage dbImage = null;	// the DB representation of this image
	private String uuid;
	private String filename;
	private String crcFilename;

	protected UploadingImage(String token, int[] initialBlockStatus, Timestamp ts, String uuid, String filename, String crcFilename)
	{
		this.token = token;
		this.ts = ts;
		this.uuid = uuid;
		this.crcFilename = crcFilename;
		this.blockStatus = initialBlockStatus;
	}

	protected void setValid( int index )
	{
		if ( blockStatus == null )
			return;
		blockStatus[index] = valid;
	}

	protected void setMissing( int index )
	{
		if ( blockStatus == null )
			return;
		blockStatus[index] = missing;
	}
	
	protected void setNeedsRequest( int index )
	{
		if ( blockStatus == null )
			return;
		blockStatus[index] *= ( blockStatus[index] < missing ) ? -1 : 1;	// switch to positive value if needed
	}
	
	protected void setNeedsCheck( int index )
	{
		if ( blockStatus == null )
			return;
		blockStatus[index] *= ( blockStatus[index] > missing ) ? -1 : 1;	// switch to negative value if needed
	}

	protected void increaseTransmittedTimes( int index )
	{
		if ( blockStatus == null || blockStatus[index] == 0 || blockStatus[index] == 200 )
			return;
		blockStatus[index] += ( blockStatus[index] < missing ) ? -1 : 1;	// increase in both directions
	}

	protected String getToken()
	{
		return this.token;
	}

	protected boolean needsRequest( int index )
	{
		if ( blockStatus == null )
			return false;
		return ( blockStatus[index] > missing && blockStatus[index] != valid );
	}

	protected boolean needsCheck( int index )
	{
		if ( blockStatus == null )
			return false;
		return ( blockStatus[index] < missing );
	}

	protected int getNumberOfBlocks()
	{
		return blockStatus.length;
	}

	protected Timestamp getTimestamp()
	{
		return this.ts;
	}

	protected DbImage getDbImage()
	{
		if ( dbImage == null ) {
			dbImage = DbImage.getImageByUUID( this.uuid );
		}
		return this.dbImage;
	}

	protected String getFilename()
	{
		return this.filename;
	}

	protected String getCrcFilename()
	{
		return this.crcFilename;
	}

	public int getAmountOfMissingBlocks()
	{
		if ( blockStatus == null )
			return 0;
		int result = 0;
		for ( int i : blockStatus ) {
			if ( blockStatus[i] == missing )
				result++;
		}
		return result;
	}
}