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package ch.epfl.maze.physical.zoo;
import ch.epfl.maze.physical.Animal;
import ch.epfl.maze.util.Direction;
import ch.epfl.maze.util.Vector2D;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* Monkey A.I. that puts its hand on the left wall and follows it.
*
* @author Pacien TRAN-GIRARD
*/
public class Monkey extends Animal {
private Direction currentDirection;
/**
* Constructs a monkey with a starting position.
*
* @param position Starting position of the monkey in the labyrinth
*/
public Monkey(Vector2D position) {
super(position);
this.currentDirection = Direction.NONE;
}
/**
* Finds a currentDirection following the "left paw rule".
*
* @param choices An array of possible directions
* @return The currentDirection to take according to the "left paw rule"
*/
private Direction followLeft(Direction[] choices) {
List<Direction> choiceList = new ArrayList<>(Arrays.asList(choices));
Direction dir = this.currentDirection.rotateLeft();
while (!choiceList.contains(dir)) dir = dir.rotateRight();
return dir;
}
/**
* Determines the strategy to follow depending on special cases.
*
* @param choices An array of possible directions
* @return The Direction to take
*/
private Direction findDirection(Direction[] choices) {
if (choices.length == 0) return Direction.NONE;
if (this.currentDirection == Direction.NONE) return choices[0];
if (choices.length == 1) return choices[0];
if (choices.length > 3) return choices[0];
return this.followLeft(choices);
}
/**
* Moves according to the relative left wall that the monkey has to follow.
*/
@Override
public Direction move(Direction[] choices) {
this.currentDirection = this.findDirection(choices);
return this.currentDirection;
}
@Override
public Animal copy() {
return new Monkey(this.getPosition());
}
}
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