@startuml
skinparam linetype ortho
skinparam groupInheritance 2

package Spring {
    interface Model
}

package Salespoint {
    interface OrderManager <T extends Order>
    class Cart
    class Cash
    class Order
    class Quantity
    class UserAccount
    class Product
    enum OrderStatus

    note "Uses Rentable and Consumable from package Catalog" as N2
    Product .. N2
}


package catering.order {
    class CustomOrder {
        - start : LocalDateTime
        - finish : LocalDateTime
    }

    enum EventType {
        EVENT_CATERING
        RENT_A_COOK
        BREAKFAST_SERVICE
        PARTY_SERVICE
    }

    note "This could be extended, too" as N1

    class OrderController {
        + OrderController()
        + initializeCart() : Cart
        + planEvent(model : Model) : String
        + addProduct(productForm : ProductForm, model : Model) : String
        + removeProduct(product : Product, model : Model) : String
        + checkout(userAccount : UserAccount, model : Model) : String
        + getOrders(model : Model) : String
        + removeOrder(order : Order) : boolean
        + invoice(model : Model, userAccount : UserAccount, order : Order) : String
    }

    class ProductForm

    OrderController ---> OrderManager : "-orderManager"
    OrderController ---> Cart : "-cart"
    OrderController ..> Model
    OrderController ...> UserAccount
    OrderController ...> OrderStatus
    OrderController ...> Cash
    OrderController ...> Quantity
    OrderController ...> CustomOrder
    CustomOrder o--- "1" EventType : -eventType
    OrderController ...> ProductForm
    N1 ..> EventType
}

OrderController ...> Salespoint.Product
CustomOrder --|> Salespoint.Order
CustomOrder ...> time.LocalDateTime
CustomOrder ...> time.DateTimeFormatter
OrderController .....> catering.orderCatalog.OrderCatalogEntry

package time {
    class LocalDateTime
    class DateTimeFormatter
}

@enduml