04. Class Hierarchy

function classHierarchy() {
  class Figure {
    constructor(unit = 'cm') {
      this.unit = unit;
    }

    get area() {
      return NaN;
    }

    changeUnits(x) {
      this.unit = x;
    }

    calcWidthUnit(x) {
      const units = {
        m: 0.01,
        cm: 1,
        mm: 10,
      };

      return x * units[this.unit];
    }

    toString() {
      return `Figures units: ${this.unit} Area: ${this.area}`;
    }
  }

  class Circle extends Figure {
    constructor(radius = 0, ...rest) {
      super(...rest);
      this.radius = radius;
    }

    get area() {
      return Math.PI * Math.pow(super.calcWidthUnit(this.radius), 2);
    }

    toString() {
      return `${super.toString()} - radius: ${super.calcWidthUnit(this.radius)}`;
    }
  }

  class Rectangle extends Figure {
    constructor(width = 0, height = 0, ...rest) {
      super(...rest);
      this._width = width;
      this._height = height;
    }

    get height() {
      return this.calcWidthUnit(this._height);
    }

    get width() {
      return this.calcWidthUnit(this._width);
    }

    set height(newHeight) {
      this._height = newHeight;
    }

    set width(newWidth) {
      this._width = newWidth;
    }

    get area() {
      return this.calcWidthUnit(this._width) * this.calcWidthUnit(this._height);
    }

    toString() {
      return `${super.toString()} - width: ${this.calcWidthUnit(this._width)}, height: ${this.calcWidthUnit(this._height)}`;
    }
  }

  return { Figure, Circle, Rectangle };
}