OOP JS 2

app.js

class AbstractProduct {
  constructor(id, name, price, category) {
    if (new.target === AbstractProduct) {
      throw new Error("AbstractProduct — это абстрактный класс.");
    }
    this.id = id;
    this.name = name;
    this.price = price;
    this.category = category;
  }

  renderCard() {
    throw new Error("Нужно реализовать renderCard() в наследнике.");
  }
}



class ClothingProduct extends AbstractProduct {
  constructor(id, name, price, size, material) {
    super(id, name, price, "Одежда");
    this.size = size;
    this.material = material;
  }

  renderCard() {
    return `
            <div class="product-card clothing">
                <h3>${this.name}</h3>
                <p>Цена: ${this.price}₽</p>
                <p>Размер: ${this.size}</p>
                <p>Материал: ${this.material}</p>
            </div>
        `;
  }
}




class BookProduct extends AbstractProduct {
  constructor(id, name, price, author, pages) {
    super(id, name, price, "Книги");
    this.author = author;
    this.pages = pages;
  }

  renderCard() {
    return `
            <div class="product-card book">
                <h3>${this.name}</h3>
                <p>Автор: ${this.author}</p>
                <p>Страниц: ${this.pages}</p>
                <p>Цена: ${this.price}₽</p>
            </div>
        `;
  }
}



class Basket {
  constructor() {
    this.items = []; // [{ product, quantity }]
  }

  addItem(product, quantity = 1) {
    const existing = this.items.find(item => item.product.id === product.id);
    if (existing) {
      existing.quantity += quantity;
    } else {
      this.items.push({ product, quantity });
    }
  }

  removeItem(productId) {
    this.items = this.items.filter(item => item.product.id !== productId);
  }

  getTotal() {
    return this.items.reduce((sum, item) =>
      sum + item.product.price * item.quantity, 0);
  }

  render() {
    if (this.items.length === 0) return "🛒 Корзина пуста.";

    return this.items.map(item =>
      `${item.product.name} — ${item.quantity} × ${item.product.price}₽`
    ).join('\n') + `\nИтого: ${this.getTotal()}₽`;
  }
}


class User {
  constructor(id, name, email) {
    this.id = id;
    this.name = name;
    this.email = email;
    this.basket = new Basket();
  }

  addToBasket(product, quantity = 1) {
    this.basket.addItem(product, quantity);
  }

  viewBasket() {
    return this.basket.render();
  }
}