package ch.epfl.maze.physical.stragegies.picker;

import ch.epfl.maze.util.Direction;

import java.util.Set;

/**
 * A decision maker cycling in each Direction starting from a given one.
 *
 * @author Pacien TRAN-GIRARD
 */
public interface CyclePicker extends BlindPicker {

    /**
     * Returns the cycle starting Direction.
     *
     * @return The starting Direction
     */
    Direction getStartingDirection();

    /**
     * Returns the Rotation Direction.
     *
     * @return The Rotation Direction
     */
    Direction getRotationDirection();

    @Override
    default Direction pick(Set<Direction> choices) {
        if (choices.isEmpty()) return FALLBACK_DIRECTION;
        if (this.getStartingDirection() == Direction.NONE) return FALLBACK_DIRECTION;
        if (this.getRotationDirection() == Direction.NONE) return FALLBACK_DIRECTION;

        Direction dir = this.getStartingDirection();
        while (!choices.contains(dir))
            dir = dir.unRelativeDirection(this.getRotationDirection());

        return dir;
    }

    /**
     * Counts the number of rotations to rotates to the given Direction
     *
     * @param direction The Direction
     * @return The number of rotations
     */
    default int countRotations(Direction direction) {
        if (direction == Direction.NONE) return 0;
        if (this.getStartingDirection() == Direction.NONE) return 0;
        if (this.getRotationDirection() == Direction.NONE) return 0;

        Direction dir = this.getStartingDirection();
        int counter = 0;
        while (dir != direction) {
            dir = dir.unRelativeDirection(this.getRotationDirection());
            counter += 1;
        }

        return counter;
    }

}