public class GameBoardAndMovement {


    private Robot robotOne;
    private Robot robotTwo;




  public static  void main(String[] args){
      Out.println("What size  of  board you want to play on!");
      Out.println("For 4x4  write s.For 16x16 write b.");
      char size=In.readChar();

      switch(size){
          case 's':
              GameBoardAndRobot(4);
              break;
          case 'b':
              GameBoardAndRobot(16);
          default:
              Out.print("Choose either Small or Big.Rest wont  be  accepted1");
              break;

      }

            startGame();
  }

    public  void startGame(){
		while(!robotOne.canSee(robotTwo))
		{
			char nextMove = Grid.readKey();

			MovementOfRobots(robotOne, nextMove);
			MovementOfRobots(robotTwo, opositeMovementOfRobots(nextMove));
		}

		Grid.showMessage("Nicely Done! :) ");
	}
    public   void GameBoardAndRobot(int gridSize){

        Grid.create(gridSize,gridSize);

        robotOne=new Robot(0, 0);
        robotTwo=new Robot(gridSize-1,gridSize-1);

        Grid.placeRobot(robotOne.curRow,robotOne.curColumn);
        Grid.placeRobot(robotTwo.curRow,robotTwo.curColumn);




    }
    //MovementOptionts
     public  void goLeft(Robot robot){
        Grid.removeRobot(robot.curRow,robot.curColumn);
        robot.curColumn--;
        Grid.placeRobot(robot.curRow,robot.curColumn);
    }
    public static void goUp(Robot robot){
        Grid.removeRobot(robot.curRow,robot.curColumn);
        robot.curRow--;
        Grid.placeRobot(robot.curRow,robot.curColumn);
    }
    public  void goDown(Robot robot){
        Grid.removeRobot(robot.curRow,robot.curColumn);
        robot.curRow++;
        Grid.placeRobot(robot.curRow,robot.curColumn);
    }
    public  void goRight(Robot robot){
        Grid.removeRobot(robot.curRow,robot.curColumn);
        robot.curColumn++;
        Grid.placeRobot(robot.curRow,robot.curColumn);
    }

    //

    public void MovementOfRobots(Robot robot,char nextMove){
        switch(nextMove){
            case 'a':
                if(Grid.insideBounds(robot.curRow, robot.curColumn-1)&&!Grid.robotAt(robot.curRow, robot.curColumn-1)){
                    goLeft(robot);

                }
                break;
            case 'w':
                if(Grid.insideBounds(robot.curRow-1, robot.curColumn)&&!Grid.robotAt(robot.curRow-1, robot.curColumn)){
                    goUp(robot);
                }
                break;
            case 's':
                if(Grid.insideBounds(robot.curRow+1, robot.curColumn)&&!Grid.robotAt(robot.curRow+1, robot.curColumn)){
                    goDown(robot);
                }
                break;
             case 'd':
                if(Grid.insideBounds(robot.curRow, robot.curColumn+1)&&!Grid.robotAt(robot.curRow, robot.curColumn+1)){
                    goRight(robot);
                }
                break;
             default:
                 break;
        }

    }//End of MovementOfRobots

    public  char opositeMovementOfRobots(char nextMove){
        switch(nextMove){
            case 'a':
                return 'd';
            case 'w':
                return 's';
            case 's':
                return 'w';
            case 'd':
                return 'a';
            default:
                return 'E';
        }

    }

}