import cs1705.*;

// -------------------------------------------------------------------------
/**
 *  This robot adds extra behaviors to a VPIRobot, so that it can harvest
 *  a field of beepers using other helper robots.
 * 
 *  @author  Stephen Edwards
 *  @version 2003.09.16
 */
public class HarvesterForeman
    extends VPIRobot
{
    //~ Instance variables ....................................................

    VPIRobot buddy = null;

    //~ Constructors ..........................................................

    // ----------------------------------------------------------
    /**
     * Construct a harvester foreman by specifying its starting state.
     * The parameters are just passed to the corresponding VPIRobot
     * constructor.
     */
    public HarvesterForeman( int       street,
                             int       avenue,
                             Direction facing,
                             int       numBeepers,
                             VPIRobot  myBuddy )
    {
        super( street, avenue, facing, numBeepers );
        buddy = myBuddy;
    }


    //~ Methods ...............................................................

    // ----------------------------------------------------------
    /**
     * Collect all the beepers in the field.
     */
    public void harvestField()
    {
        harvestOneRow();
        goToNextRow();
        harvestOneRow();
    }

    
    // ----------------------------------------------------------
    /**
     * Pick up one row of beepers.
     */
    public void harvestOneRow()
    {
        while ( nextToABeeper() )
        {
            pickBeeper();
            move();
        }
    }

    
    // ----------------------------------------------------------
    /**
     * Pick up one row of beepers.
     */
    public void goToNextRow()
    {
        turnLeft();
        move();
        turnLeft();
        move();
    }

    
    // ----------------------------------------------------------
    /**
     * Move, and also ask buddy to move.
     */
    public void move()
    {
        super.move();
        buddy.move();
    }

    
    // ----------------------------------------------------------
    /**
     * Pick up a beeper, and also ask buddy to do the same.
     */
    public void pickBeeper()
    {
        super.pickBeeper();
        buddy.pickBeeper();
    }

    
    // ----------------------------------------------------------
    /**
     * Turn left, and also ask buddy to do the same.
     */
    public void turnLeft()
    {
        super.turnLeft();
        buddy.turnLeft();
    }
}