import { Polygon } from './polygon.js';
import { Vector } from './vector.js';

export class Rectangle extends Polygon {
  constructor(position, dimensions) {
    super();
    if (this.vertices.length) {
      throw new Error('Reinitializing geometry is not allowed');
    }
    this.position = Vector.from(position);
    this.dimensions = Vector.from(dimensions);
    // Next point is obtained by moving the specified length along each dimension
    // one at a time, then reversing these movements in the same order.
    let point = this.position;
    for (let dim = dimensions.length - 1; dim >= 0; dim--) {
      this.addVertex(point);
      const increment = Vector.unitVector(dim, dimensions.length);
      point = point.add(increment);
    }
    for (let dim = dimensions.length - 1; dim >= 0; dim--) {
      this.addVertex(point);
      const increment = Vector.unitVector(dim, dimensions.length);
      point = point.subtract(increment);
    }
  }

  get center() {
    return Vector.from(this.dimensions.map((Q, idx) => this.position[idx] + Q / 2));
  }

  doesOverlap(rect) {
    return this.dimensions.every((_, idx) => {
      const thisMin = this.position[idx];
      const thisMax = this.position[idx] + this.dimensions[idx];
      const thatMin = rect.position[idx];
      const thatMax = rect.position[idx] + rect.dimensions[idx];
      return (thisMin <= thatMin && thisMax >= thatMin)
        || (thisMin >= thatMin && thisMin <= thatMax);
    });
  }

  get aspectRatio() {
    const [width, height] = this.dimensions;
    return height / width;
  }
}