/**
* ROLE: EXECUTABLE
* CONNECTED VIA: CommonJS module export
* PURPOSE: E-commerce product and cart management
* FAILURE MODES: Insufficient stock throws error, unavailable products throw error, empty cart throws error
*
* Authority: 02-typescript-types.md
*/
// E-commerce Shopping Cart Service
class Product {
constructor(id, name, price, stock, category, description) {
this.id = id;
this.name = name;
this.price = price;
this.stock = stock;
this.category = category;
this.description = description;
}
isAvailable() {
return this.stock > 0;
}
updateStock(quantity) {
if (quantity > this.stock) {
throw new Error('Insufficient stock');
}
this.stock -= quantity;
return true;
}
}
class ShoppingCart {
constructor() {
this.items = new Map();
}
addItem(product, quantity) {
if (!product.isAvailable()) {
throw new Error('Product not available');
}
const existingItem = this.items.get(product.id);
if (existingItem) {
existingItem.quantity += quantity;
} else {
this.items.set(product.id, { product, quantity });
}
}
removeItem(productId) {
if (!this.items.has(productId)) {
throw new Error('Item not in cart');
}
this.items.delete(productId);
}
calculateTotal() {
let total = 0;
this.items.forEach(item => {
total += item.product.price * item.quantity;
});
return total;
}
getItems() {
return Array.from(this.items.values());
}
}
class OrderProcessor {
processOrder(cart) {
const items = cart.getItems();
if (items.length === 0) {
throw new Error('Cart is empty');
}
const orderId = Math.random().toString(36).substr(2, 9);
const total = cart.calculateTotal();
items.forEach(item => {
item.product.updateStock(item.quantity);
});
return { orderId, total, itemCount: items.length };
}
}
module.exports = { Product, ShoppingCart, OrderProcessor };
