نمط Builder

// قبل Builder — constructor بمعاملات كثيرة (telescoping constructor)
class House {
  constructor(walls, doors, windows, roof, garage, pool, garden, floors) {
    this.walls = walls;
    this.doors = doors;
    this.windows = windows;
    this.roof = roof;
    this.garage = garage; // اختياري
    this.pool = pool; // اختياري
    this.garden = garden; // اختياري
    this.floors = floors; // اختياري
  }
}

// كل استدعاء لازم يمرر كل شيء بنفس الترتيب، حتى لو null
const house1 = new House(4, 2, 6, "flat", false, false, false, 1);
const house2 = new House(4, 1, 4, "gable", true, true, false, 2);

class House {
  constructor() {
    this.walls = 0;
    this.doors = 0;
    this.windows = 0;
    this.hasGarage = false;
    this.hasPool = false;
  }
}

class HouseBuilder {
  constructor() {
    this.house = new House();
  }

  setWalls(count) {
    this.house.walls = count;
    return this; // fluent — يسمح بسلسلة استدعاءات
  }

  setDoors(count) {
    this.house.doors = count;
    return this;
  }

  addGarage() {
    this.house.hasGarage = true;
    return this;
  }

  addPool() {
    this.house.hasPool = true;
    return this;
  }

  build() {
    return this.house;
  }
}

// الاستخدام — تبني فقط اللي تحتاجه، بترتيب واضح ومقروء
const house = new HouseBuilder()
  .setWalls(4)
  .setDoors(2)
  .addGarage()
  .build();

console.log(house); // { walls: 4, doors: 2, windows: 0, hasGarage: true, hasPool: false }

class HouseDirector {
  static buildMinimalHouse(builder) {
    return builder.setWalls(4).setDoors(1).build();
  }

  static buildLuxuryHouse(builder) {
    return builder
      .setWalls(6)
      .setDoors(3)
      .addGarage()
      .addPool()
      .build();
  }
}

const minimal = HouseDirector.buildMinimalHouse(new HouseBuilder());
const luxury = HouseDirector.buildLuxuryHouse(new HouseBuilder());

class Pizza:
    def __init__(self):
        self.size = "medium"
        self.toppings = []

    def __repr__(self):
        return f"Pizza({self.size}, {self.toppings})"


class PizzaBuilder:
    def __init__(self):
        self.pizza = Pizza()

    def set_size(self, size):
        self.pizza.size = size
        return self

    def add_topping(self, topping):
        self.pizza.toppings.append(topping)
        return self

    def build(self):
        return self.pizza


pizza = (
    PizzaBuilder()
    .set_size("large")
    .add_topping("جبنة")
    .add_topping("زيتون")
    .build()
)
print(pizza)  # Pizza(large, ['جبنة', 'زيتون'])