public class Lab2
{
  public static void cleanSquare()
  {
    Robot.load("square.txt");
    Robot.setDelay(0.1);
    
    Lab2.makeLineLight();
    Lab2.moveAndTurn();
    Lab2.makeLineLight();
    Lab2.moveAndTurn();
    Lab2.makeLineLight();
    Lab2.moveAndTurn();
    Lab2.makeLineLight();
    Lab2.moveAndTurn();
  }
  
  public static void makeLineLight()
  {
    // Precondition: Robot is facing a light line of 
    // 6 light cells.
    Lab2.makeCellLight();
    Lab2.makeCellLight();
    Lab2.makeCellLight();
    Lab2.makeCellLight();
    Lab2.makeCellLight();    
  }

  public static void makeCellLight()
  {
    // Precondition: Robot is in front of a dark cell
    Robot.move();
    Robot.makeLight();
  }

  public static void moveAndTurn()
  {
    // Precondition: Robot is in front of a corner cell
    // of the square.
    Robot.move();
    Robot.turnLeft();
  }
  
  public static void darkenComb()
  {
    Robot.load("comb.txt");
    Robot.setDelay(0.05);
 
    Lab2.darkenOneCombFinger();
    Lab2.returnToLeft();
    Lab2.advanceToNextFinger();
    
    Lab2.darkenOneCombFinger();
    Lab2.returnToLeft();
    Lab2.advanceToNextFinger();

    Lab2.darkenOneCombFinger();
    Lab2.returnToLeft();
    Lab2.advanceToNextFinger();
 
    Lab2.darkenOneCombFinger();
    Lab2.returnToLeft();
    Lab2.advanceToNextFinger();

    Lab2.darkenOneCombFinger();
    Lab2.returnToLeft();
  }

  public static void darkenOneCombFinger()
  {
    // Precondition: Robot is facing right on a light cell
    // and is looking at a row of 6 light squares
    Robot.makeDark();
    Lab2.turnRobotRight();
    Lab2.makeCellDark();
    Lab2.makeCellDark();
    Lab2.makeCellDark();
    Lab2.makeCellDark();
    Lab2.makeCellDark();
    Lab2.makeCellDark(); 
  }
  
  public static void makeCellDark()
  {
    // Precondition: Robot is in front of a light cell
    Robot.move();
    Robot.makeDark();
  }
  
  public static void returnToLeft()
  {
    // Precondition: Robot is at the right end
    // of a line of 7 dark cells, facing right
    Lab2.turnRobotAround();
    Robot.move();
    Robot.move();
    Robot.move();
    Robot.move();
    Robot.move();
    Robot.move();
    Lab2.turnRobotRight();
  }
  
  public static void advanceToNextFinger()
  {
    // Precondition: Robot is facing up and has 2
    // light cells in front of it
    Robot.move();
    Robot.makeDark();
    Robot.move();
  }
  
  public static void makeCheckered()
  {
    Robot.load("blank.txt");
    Robot.setDelay(0.05);
    
    Lab2.makeCheckeredColumn();
    Lab2.turnRightToNextColumn();
    Lab2.makeCheckeredColumn();
    Lab2.turnLeftToNextColumn();
    Lab2.makeCheckeredColumn();
    Lab2.turnRightToNextColumn();
    Lab2.makeCheckeredColumn();
    Lab2.turnLeftToNextColumn();
    Lab2.makeCheckeredColumn();
    Lab2.turnRightToNextColumn();
    Lab2.makeCheckeredColumn();
    Lab2.turnLeftToNextColumn();
    Lab2.makeCheckeredColumn(); 
    Lab2.turnRightToNextColumn();
    Lab2.makeCheckeredColumn();
  }

  public static void makeCheckeredColumn()
  {
    // Precondition: Robot is facing a completely clear column
    Lab2.makeCheckeredPair();
    Lab2.makeCheckeredPair();
    Lab2.makeCheckeredPair();
    Robot.makeDark();
    Robot.move();
  }
  
  public static void makeCheckeredPair()
  {
    // Precondition: Robot has at least two light
    // cells directly in front of it
    Robot.makeDark();
    Robot.move();
    Robot.move();
  }
 
  public static void turnRightToNextColumn()
  {
    // Precondition: Robot is facing the edge at the
    // top of a column and the column to the right
    // is completely light.
    Lab2.turnRobotRight();
    Robot.move();
    Lab2.turnRobotRight();
  }
  
  public static void turnLeftToNextColumn()
  {
    // Precondition: Robot is facing the edge at the
    // bottom of a column and the column to the right
    // is completely light.
    Robot.turnLeft();
    Robot.move();
    Robot.turnLeft();
  }
  
  public static void turnRobotRight()
  {
    Robot.turnLeft();
    Robot.turnLeft();
    Robot.turnLeft();   
  }
  
  public static void turnRobotAround()
  {
    Robot.turnLeft();
    Robot.turnLeft();    
  }
  
}