DumboController.java

/*
Ex1
The value of Math.random()*8 will be randomly between 0 and 7.99.
So when I convert it to int it will be a number between 0 and 7 with equal probability.

I don't want to randomly choose the direction every time, so I initialize the direction to IRobot.AHEAD.

The initial uneven probabilities are due to the use of Math.round(), so their value ranges are
0 -> (0,0.499)		0.5/3
1 -> (0.5,1.499)	1.0/3
2 -> (1.5,2.499)	1.0/3
3 -> (2.5,2.999)	0.5/3

I think the current code is not fundamentally different from the previous one, they all run randomly.
I think it would be a disruptive change if the search could be done logically, similar to using DFS or other algorithms.
*/

import uk.ac.warwick.dcs.maze.logic.IRobot;

public class DumboController
{

	private int randomDirection() {

		return switch ((int)(Math.random()*4)) { //Return the corresponding direction based on the value of Math.random()*4
			case 0 -> IRobot.LEFT;
			case 1 -> IRobot.RIGHT;
			case 2 -> IRobot.BEHIND;
			case 3 -> IRobot.AHEAD;
			default-> -1;
		};

	}

	private void logPrinter(IRobot robot, int direction) {

		int wallNum = 0;
		for (int i = IRobot.AHEAD; i <= IRobot.LEFT; i++) if (robot.look(i) == IRobot.WALL) wallNum++; //Count the number of walls around the current position
		System.out.println( "I'm going " +
			switch (direction) {
				case IRobot.LEFT	-> "left ";
				case IRobot.RIGHT	-> "right ";
				case IRobot.BEHIND	-> "backwards ";
				case IRobot.AHEAD	-> "forward ";
				default				-> "Error!!!";
			}+
			switch (wallNum) {
				case 0	-> "at a crossroads";
				case 1	-> "at a junction";
				case 2	-> "down a corridor";
				case 3	-> "at a deadend";
				default	-> "Error!!!";
		});

	}

	public void controlRobot(IRobot robot) {

		int direction = IRobot.AHEAD;
		while ((robot.look(direction) == IRobot.WALL)||((int)(Math.random()*8) == 0)) direction = randomDirection(); //Reselect direction when the current direction is a wall or Math.random()*8 == 0
		logPrinter(robot,direction);
		robot.face(direction); //Face the direction

	}

}