Архитектура E-commerce платформы

interface Product {
  id: string
  slug: string
  name: string
  description: string
  price: number
  comparePrice?: number
  images: string[]
  category: Category
  variants: ProductVariant[]
  stock: number
  featured: boolean
}
 
interface ProductVariant {
  id: string
  name: string
  options: Record<string, string> // { "Size": "M", "Color": "Blue" }
  price: number
  stock: number
  sku: string
}

interface Order {
  id: string
  orderNumber: string
  userId: string
  items: OrderItem[]
  subtotal: number
  tax: number
  shipping: number
  total: number
  status: OrderStatus
  shippingAddress: Address
  billingAddress: Address
  paymentMethod: PaymentMethod
  createdAt: string
}

// stores/cart-store.ts
import { create } from 'zustand'
import { persist } from 'zustand/middleware'
 
interface CartState {
  items: CartItem[]
  addItem: (product: Product, quantity: number) => void
  removeItem: (productId: string) => void
  updateQuantity: (productId: string, quantity: number) => void
  clearCart: () => void
  total: () => number
}
 
export const useCartStore = create<CartState>()(
  persist(
    (set, get) => ({
      items: [],
      
      addItem: (product, quantity) => {
        set(state => ({
          items: [...state.items, { product, quantity }]
        }))
      },
      
      removeItem: (productId) => {
        set(state => ({
          items: state.items.filter(item => item.product.id !== productId)
        }))
      },
      
      updateQuantity: (productId, quantity) => {
        set(state => ({
          items: state.items.map(item =>
            item.product.id === productId
              ? { ...item, quantity }
              : item
          )
        }))
      },
      
      clearCart: () => set({ items: [] }),
      
      total: () => {
        return get().items.reduce(
          (sum, item) => sum + item.product.price * item.quantity,
          0
        )
      }
    }),
    {
      name: 'cart-storage'
    }
  )
)

// Статическая генерация для страниц товаров
export async function generateStaticParams() {
  const products = await getProducts()
  return products.map(product => ({
    slug: product.slug
  }))
}
 
// Revalidation каждые 60 секунд
export const revalidate = 60

const addToCart = async (product: Product) => {
  // Оптимистично обновляем UI
  useCartStore.getState().addItem(product, 1)
  
  try {
    // Отправляем запрос на сервер
    await fetch('/api/cart', {
      method: 'POST',
      body: JSON.stringify({ productId: product.id, quantity: 1 })
    })
  } catch (error) {
    // Откатываем изменения при ошибке
    useCartStore.getState().removeItem(product.id)
    toast.error('Failed to add to cart')
  }
}