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package ch.epfl.maze.physical.zoo;
import ch.epfl.maze.physical.Animal;
import ch.epfl.maze.physical.ProbabilisticAnimal;
import ch.epfl.maze.util.Direction;
import ch.epfl.maze.util.Vector2D;
import java.util.ArrayList;
import java.util.List;
/**
* Mouse A.I. that remembers only the previous choice it has made.
*
* @author Pacien TRAN-GIRARD
*/
public class Mouse extends ProbabilisticAnimal {
private Direction previousChoice;
/**
* Constructs a mouse with a starting position.
*
* @param position Starting position of the mouse in the labyrinth
*/
public Mouse(Vector2D position) {
super(position);
this.previousChoice = Direction.NONE;
}
/**
* Excludes the origin direction for choices.
*
* @param choices An array of choices
* @return An array of smart choices
*/
private Direction[] excludeOrigin(Direction[] choices) {
List<Direction> smartChoices = new ArrayList<>(choices.length - 1); // max size, excluding origin
for (Direction dir : choices)
if (!dir.isOpposite(this.previousChoice))
smartChoices.add(dir);
return smartChoices.toArray(new Direction[smartChoices.size()]);
}
/**
* Moves according to an improved version of a <i>random walk</i> : the
* mouse does not directly retrace its steps.
*/
@Override
public Direction move(Direction[] choices) {
Direction[] smartChoices = choices.length > 1 ? this.excludeOrigin(choices) : choices;
Direction dir = super.move(smartChoices);
this.previousChoice = dir;
return dir;
}
@Override
public Animal copy() {
return new Mouse(this.getPosition());
}
}
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