export default class Vector {
	constructor(x, y) {
		this._x = x;
		this._y = y;
	}

	// Public

	get x() { return this._x; }
	get y() { return this._y; }

	add(vector) {
		this._x += vector.x;
		this._y += vector.y;

		return this;
	}

	subtract(vector) {
		this._x -= vector.x;
		this._y -= vector.y;

		return this;
	}

	multiply(scalar) {
		this._x *= scalar;
		this._y *= scalar;

		return this;
	}

	divide(scalar) {
		this._x /= scalar;
		this._y /= scalar;

		return this;
	}

	shift(scalar) {
		this._x += scalar;
		this._y += scalar;

		return this;
	}

	normalize(scalar) {
		let magnitude = this.magnitude();
		if (magnitude)
			this.divide(magnitude);
		else
			this.multiply(0);

		return this;
	}

	limit(scalar) {
		if (this.magnitude() > scalar) {
			this.normalize();
			this.multiply(scalar);
		}

		return this;
	}

	distance(vector) {
		return Math.sqrt(Math.pow(this._x - vector.x, 2) + Math.pow(this._y - vector.y, 2));
	}

	magnitude(scalar) {
		return Math.sqrt(Math.pow(this._x, 2) + Math.pow(this._y, 2));
	}
}