export class Vector4 {
  constructor(
    public x: number = 0,
    public y: number = 0,
    public z: number = 0,
    public w: number = 0
  ) {}

  static fromArray(arr: number[]): Vector4 {
    return new Vector4(arr[0], arr[1], arr[2], arr[3]);
  }

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

  add(other: Vector4): Vector4 {
    return new Vector4(this.x + other.x, this.y + other.y, this.z + other.z, this.w + other.w);
  }

  subtract(other: Vector4): Vector4 {
    return new Vector4(this.x - other.x, this.y - other.y, this.z - other.z, this.w - other.w);
  }

  multiply(scalar: number): Vector4 {
    return new Vector4(this.x * scalar, this.y * scalar, this.z * scalar, this.w * scalar);
  }

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

  normalize(): Vector4 {
    const len = this.length();
    if (len === 0) return new Vector4();
    return this.multiply(1 / len);
  }

  distance(other: Vector4): number {
    return this.subtract(other).length();
  }
}