import becker.robots.*;
import java.util.Random;

/** A class of robot that can do a random walk.
 *
 * @author Duncan Buell
 *
 *
**/
public class RandomWalker1 extends RobotSE
{
/** Construct a new RandomWalker robot.
 *  @param aCity The city where the RandomWalker will be created.
 *  @param aStreet The RandomWalker's initial street.
 *  @param anAvenue The RandomWalker's initial avenue.
 *  @param aDirection The RandomWalker's initial direction.
 *  @param numThings the initial number of things in the backpack.
**/

  public RandomWalker1(City aCity,int aStreet,int anAvenue,Direction aDirection,int numThings)
  {
    super(aCity, aStreet, anAvenue, aDirection, numThings);
  }
   
/* **************************************************************************** */
/** Do the random walk until you move "boundary" streets or avenues from (0,0).
**/
  public void doTheWalk(int boundary)
  {
    boolean atBoundary;
    int howManySteps,howManyTurns;
    Random theRandom = new Random();

    atBoundary = false;
    while(false == atBoundary)
    {
      howManyTurns = getRandomNumber(theRandom,4);   
      while(howManyTurns > 0)
      {
        this.turnRight();
        howManyTurns = howManyTurns - 1; // we could write --howManyTurns;
      }
    
      howManySteps = getRandomNumber(theRandom,5);
      while(howManySteps > 0)
      {
        this.move();
// note that we read the following as "howManySteps <-- howManySteps - 1"
// and not as a mathematical "equals" symbol
        howManySteps = howManySteps - 1; // we could write --howManySteps;
      }
    
      this.putThing();
      if(this.getStreet() < -boundary)
        atBoundary = true;
      if(this.getStreet() > boundary)
        atBoundary = true;
      
      if(this.getAvenue() < -boundary)
        atBoundary = true;
      if(this.getAvenue() > boundary)
        atBoundary = true;
    } // while(false == atBoundary)
    
  } // public void doTheWalk(int boundary)
  
/* **************************************************************************** */
/** get a random number
 *  @param theRandom The random number class that has been invoked
 *  @param upperBound The upper bound of the number to be returned
 *
 *  This function returns a random integer number between 0 and upperBound-1
 *  inclusive.
**/
  private int getRandomNumber(Random theRandom, int upperBound)
  {
    return (int) (theRandom.nextFloat() * upperBound);
  }

} // public class RandomWalker extends RobotSE