export class Vector2 {
  constructor(
    public x: number = 0,
    public y: number = 0
  ) {}

  static fromArray(arr: number[]): Vector2 {
    return new Vector2(arr[0], arr[1]);
  }

  toArray(): [number, number] {
    return [this.x, this.y];
  }

  add(other: Vector2): Vector2 {
    return new Vector2(this.x + other.x, this.y + other.y);
  }

  subtract(other: Vector2): Vector2 {
    return new Vector2(this.x - other.x, this.y - other.y);
  }

  multiply(scalar: number): Vector2 {
    return new Vector2(this.x * scalar, this.y * scalar);
  }

  length(): number {
    return Math.sqrt(this.x * this.x + this.y * this.y);
  }

  normalize(): Vector2 {
    const len = this.length();
    if (len === 0) return new Vector2();
    return this.multiply(1 / len);
  }

  distance(other: Vector2): number {
    return this.subtract(other).length();
  }
}