import java.io.*;
import java.util.*;
import java.net.*;
import java.awt.*;

public class WorkSender
{
    static boolean[] doneLines;
    static long[] startTimes;
    static long[] finishTimes;
    static int lastLine, magicPrime;
    static Dimension bounds;
    static World w;
    static PictureKeeper pk;

    public WorkSender(Dimension boundsin, World win, 
	PictureKeeper pkk)
    {
	bounds = boundsin;
	w = win;
	startTimes = new long[bounds.height];
	finishTimes = new long[bounds.height];
	lastLine = -1;
	magicPrime = -1;
	pk = pkk;
    }  

    public void sendWorld(ObjectOutputStream oos)
    {
	try 
	{
	    oos.writeObject(bounds);
	    oos.writeObject(w);
	}
	catch (Exception e)
	{
	    System.out.println("sendWorld: " + e);
	}
    }

    public synchronized void sendLine(ObjectOutputStream oos)
    {
	int currentLine = nextLineNumber();

	startTimes[currentLine] = System.currentTimeMillis();

	try 
	{
	    oos.writeObject(new Integer(currentLine));		
	    oos.flush();
	}
	catch (Exception e)
	{
	    System.out.println("sendLine: " + e);
	}
	
	lastLine = currentLine;
    }

    private int nextLineNumber()    // We'd synchronize, but only
    {				    // synchronized SendLine calls it
	if (magicPrime == -1)
	{
	    if (bounds.height % 73 != 0)
	    {
		magicPrime = 73;
	    }
	    else if (bounds.height % 59 != 0)
	    {
		magicPrime = 59;
	    }
	    else
		magicPrime = 1079;
	}
	
	int trythis = (lastLine + magicPrime) % bounds.height;
	if(pk.doneLine(trythis))
	{
	    for(int i=0; i<bounds.height; i++)
	    {
		if (!pk.doneLine(i))
		    return i;
	    }
	}
	
	return trythis;
    }
}