@startuml
package com.iluwatar.bff {
  class App {
    - LOGGER : Logger {static}
    - USER_ID : String {static}
    - PRODUCT_ID : String {static}
    - DEMO_PRICE_USD : double {static}
    - DEMO_STOCK_LEVEL : int {static}
    + App()
    + main(args : String[]) {static}
  }
}
package com.iluwatar.bff.bff {
  interface ClientBff<T> {
    + getDashboard(userId : String) : T {abstract}
  }
  class DesktopBff {
    - authService : AuthService
    - orderService : OrderService
    - supplierService : SupplierService
    + DesktopBff(auth : AuthService, orders : OrderService, suppliers : SupplierService)
    + getDashboard(userId : String) : DesktopDashboardResponse
  }
  class MobileBff {
    - MAX_RECENT_ORDERS : int {static}
    - authService : AuthService
    - cartService : CartService
    - orderService : OrderService
    + MobileBff(auth : AuthService, cart : CartService, orders : OrderService)
    + getDashboard(userId : String) : MobileDashboardResponse
  }
}
package com.iluwatar.bff.dto {
  class DesktopDashboardResponse {
    - greeting : String
    - loyaltyTier : String
    - orderStatuses : List<String>
    - supplierStockSummaries : List<String>
    + DesktopDashboardResponse(greeting : String, loyaltyTier : String, orderStatuses : List<String>, supplierStockSummaries : List<String>)
  }
  class MobileDashboardResponse {
    - greeting : String
    - cartItemCount : int
    - cartTotalUsd : double
    - recentOrderSummaries : List<String>
    + MobileDashboardResponse(greeting : String, cartItemCount : int, cartTotalUsd : double, recentOrderSummaries : List<String>)
  }
}
package com.iluwatar.bff.model {
  class CartItem {
    - product : Product
    - quantity : int
    + CartItem(product : Product, quantity : int)
    + lineTotal() : double
  }
  class Order {
    - id : String
    - productName : String
    - status : String
    + Order(id : String, productName : String, status : String)
  }
  class Product {
    - id : String
    - name : String
    - priceUsd : double
    + Product(id : String, name : String, priceUsd : double)
  }
  class SupplierRecord {
    - productId : String
    - supplierName : String
    - stockLevel : int
    + SupplierRecord(productId : String, supplierName : String, stockLevel : int)
  }
  class User {
    - id : String
    - displayName : String
    - loyaltyTier : String
    + User(id : String, displayName : String, loyaltyTier : String)
  }
}
package com.iluwatar.bff.service {
  interface AuthService {
    + getUser(userId : String) : User {abstract}
  }
  interface CartService {
    + getCart(userId : String) : List<CartItem> {abstract}
  }
  interface OrderService {
    + getOrders(userId : String) : List<Order> {abstract}
  }
  interface SupplierService {
    + getSupplierRecords(productId : String) : List<SupplierRecord> {abstract}
  }
}
package com.iluwatar.bff.service.impl {
  class InMemoryAuthService {
    - users : Map<String, User>
    + InMemoryAuthService(userData : Map<String, User>)
    + getUser(userId : String) : User
  }
  class InMemoryCartService {
    - cartsByUserId : Map<String, List<CartItem>>
    + InMemoryCartService(carts : Map<String, List<CartItem>>)
    + getCart(userId : String) : List<CartItem>
  }
  class InMemoryOrderService {
    - ordersByUserId : Map<String, List<Order>>
    + InMemoryOrderService(orders : Map<String, List<Order>>)
    + getOrders(userId : String) : List<Order>
  }
  class InMemorySupplierService {
    - recordsByProductId : Map<String, List<SupplierRecord>>
    + InMemorySupplierService(records : Map<String, List<SupplierRecord>>)
    + getSupplierRecords(productId : String) : List<SupplierRecord>
  }
}
DesktopBff ..|> ClientBff
MobileBff ..|> ClientBff
DesktopBff --> "-authService" AuthService
DesktopBff --> "-orderService" OrderService
DesktopBff --> "-supplierService" SupplierService
MobileBff --> "-authService" AuthService
MobileBff --> "-cartService" CartService
MobileBff --> "-orderService" OrderService
InMemoryAuthService ..|> AuthService
InMemoryCartService ..|> CartService
InMemoryOrderService ..|> OrderService
InMemorySupplierService ..|> SupplierService
CartItem --> "-product" Product
@enduml