/**
 * Answering the turtle question from your book
 * 
 * Hunter
 * Deitel and Deitel chapter 7 problems
 */
import java.util.*;


public class Turtle
{
    private final int MAX = 20;
    private char floor[][];
    private boolean pen = false;
    private int direction = 1;
    private int x = 0;
    private int y = 0;
    
    Turtle()
    {
       floor = new char[MAX][MAX];
       for(int i=0; i<MAX; i++)
          for(int j=0; j<MAX; j++)
             floor[i][j] = '.';
        
        
             
       start();
     }
      
     private void start()
     {
         Scanner input = new Scanner(System.in);
         int in = 0;
         
          menu();
          
         do{
             
             System.out.println("Give a command:");
            
             in = input.nextInt();
             switch(in)
             {
                 case 1:
                   pen = false;
                   break;
                 case 2:
                   pen = true;
                   break;
                 case 3:
                   turn(1);
                   System.out.println("****Turning right");
                   break;
                 case 4:
                   turn(3);
                   System.out.println("****Turning left");
                   break;
                 case 5:
                   move();
                   break;
                 case 6:
                   print();
                   break;
                 
                 case 9:
                    System.out.println("Goodbye");
                   break;
                 default:
                    System.out.println("Not a choice");
               }
            }while(in != 9);
     }
     
     private void menu()
     {
         System.out.println("Press 1 for pen up");
         System.out.println("Press 2 for pen down");
         System.out.println("Press 3 to turn right");
         System.out.println("Press 4 to turn left");
         System.out.println("Press 5 to move forward");
         System.out.println("Press 6 to print floor");
         System.out.println("Press 9 to exit");
     }
     
     private void turn(int a)
     {
         direction =  (direction + a) % 4; 
      
      }
        
     
        
     private void print()
     {
         for(int i=0; i<MAX; i++)
         {
             for(int j=0; j<MAX; j++)
                if(i == x && j ==y)
                  System.out.print("O ");
                else
                 System.out.print(floor[i][j] + " ");
                 
             System.out.println("");
        }
     }
     private void move()
     {
        System.out.println("How far do you want to move?");
        int dist = new Scanner(System.in).nextInt();
        
        switch(direction)
        {
            case 1:
               caseOne(dist);
               break;
            case 2:
                caseTwo(dist);
                break;
            case 3:
                caseThree(dist);
                break;
             case 0:
                caseZero(dist);
                break;
             default:
                System.out.println("You have messed up somewhere along the way.");
         }
     }   
     private void caseOne(int dist)
     {
         int i =0;
         System.out.println("Moving right");
         for(i=y; i<y+dist; i++)
            if(i > MAX)
              break;
            else
                if(pen)
                   floor[x][i] = 'x';
          
          y = i;
     }
     private void caseTwo(int dist)
     {
         System.out.println("Moving down " + dist + " starting at " + x + ", " + y);     
         int i = 0;
         for( i=x; i<x+dist; i++)
            if(i > MAX)
              break;
            else
                if(pen)
                   floor[i][y] = 'x';
          x=i;
     }
     
     private void caseThree(int dist)
     {
              System.out.println("Moving left");
         int i = 0;
         for(i=y; i>y-dist; i--)
            if(i < 0)
              break;
            else
                if(pen)
                   floor[x][i] = 'x';
         y = i;
     }
     
     private void caseZero(int dist)
     {
         System.out.println("Moving up " + dist + " starting at " + x + ", " + y);
         int i =0;
         for(i=x; i>x-dist; i--)
            if(i < 0)
              break;
            else
               if(pen)
                 floor[i][y] = 'x';
                 
          x=i;
     }
     
     public static void main(String [] args)
     {
         new Turtle();
     }
}