package ch.epfl.maze.physical.zoo;

import ch.epfl.maze.physical.Animal;
import ch.epfl.maze.physical.stragegies.picker.RandomPicker;
import ch.epfl.maze.physical.stragegies.reducer.BackwardReducer;
import ch.epfl.maze.util.Direction;
import ch.epfl.maze.util.Vector2D;

import java.util.Set;

/**
 * Mouse A.I. that remembers only the previous choice it has made.
 *
 * @author EPFL
 * @author Pacien TRAN-GIRARD
 */
public class Mouse extends Animal implements BackwardReducer, RandomPicker {

    /**
     * Constructs a mouse with a starting position.
     *
     * @param position Starting position of the mouse in the labyrinth
     */
    public Mouse(Vector2D position) {
        super(position);
    }

    /**
     * Moves according to an improved version of a <i>random walk</i> : the
     * mouse does not directly retrace its steps.
     */
    @Override
    public Direction move(Set<Direction> choices) {
        Set<Direction> smartChoices = choices.size() > 1 ? this.reduce(choices) : choices;
        return this.pick(smartChoices);
    }

    @Override
    public Animal copy() {
        return new Mouse(this.getPosition());
    }

}