class moving {
    #front_back;
    #left_right;

    static get left() {
        return -1;
    }

    static get right() {
        return 1;
    }

    static get front() {
        return 1;
    }

    static get back() {
        return -1;
    }

    constructor() {
        this.stop();
    }

    stop() {
        this.#left_right = 0;
        this.#front_back = 0;
    }

    add_left() {
        this.#left_right = moving.left;
    }

    add_right() {
        this.#left_right = moving.right;
    }

    add_front() {
        this.#front_back = moving.front;
    }

    add_back() {
        this.#front_back = moving.back;
    }

    stop_front_back() {
        this.#front_back = 0;
    }

    stop_left_right() {
        this.#left_right = 0;
    }

    get is_back() {
        return this.#front_back === moving.back;
    }

    get is_front() {
        return this.#front_back === moving.front;
    }

    get is_left() {
        return this.#left_right === moving.left;
    }

    get is_right() {
        return this.#left_right === moving.right;
    }
}

export { moving }