---

@startuml
skinparam classAttributeIconSize 0

' =========================
' Покупатели и корзина
' =========================

class Customer {
    - id: int
    - firstName: String
    - lastName: String
    - phone: String
    - email: String
    - birthDate: Date
    - registrationDate: Date
    + createOrder(): Order
    + viewOrders(): List<Order>
}

class Basket {
    - id: int
    - createdAt: DateTime
    + addProduct(product: Product, quantity: int)
    + removeProduct(product: Product)
    + clear()
    + getTotalPrice(): Decimal
}

class BasketItem {
    - id: int
    - quantity: int
    + getTotalPrice(): Decimal
}

Customer "1" *-- "0..1" Basket
Basket "1" *-- "0..*" BasketItem
BasketItem "0..*" --> "1" Product


' =========================
' Заказы и оплата
' =========================

class Order {
    - id: int
    - orderDate: DateTime
    - status: OrderStatus
    - totalPrice: Decimal
    + calculateTotal(): Decimal
    + changeStatus(status: OrderStatus)
    + cancel()
}

class OrderItem {
    - id: int
    - quantity: int
    - price: Decimal
    + getTotalPrice(): Decimal
}

class Payment {
    - id: int
    - amount: Decimal
    - paymentDate: DateTime
    - paymentMethod: PaymentMethod
    - status: PaymentStatus
    + process()
    + refund()
}

enum OrderStatus {
    CREATED
    PAID
    PROCESSING
    COMPLETED
    CANCELLED
}

enum PaymentMethod {
    CASH
    BANK_CARD
    ONLINE
}

enum PaymentStatus {
    PENDING
    SUCCESSFUL
    FAILED
    REFUNDED
}

Customer "1" -- "0..*" Order
Order "1" *-- "1..*" OrderItem
OrderItem "0..*" --> "1" Product
Order "1" *-- "0..*" Payment


' =========================
' Товары
' =========================

class Product {
    - id: int
    - name: String
    - description: String
    - price: Decimal
    - article: String
    + changePrice(price: Decimal)
}

class Category {
    - id: int
    - name: String
    - description: String
}

class Manufacturer {
    - id: int
    - name: String
    - country: String
}

Category "1" -- "0..*" Product
Category "0..1" <-- "0..*" Category : parent
Manufacturer "1" -- "0..*" Product


' =========================
' Склад
' =========================

class Warehouse {
    - id: int
    - name: String
    - address: String
}

class Stock {
    - id: int
    - quantity: int
    - reservedQuantity: int
    + increase(quantity: int)
    + decrease(quantity: int)
    + reserve(quantity: int)
    + getAvailableQuantity(): int
}

Warehouse "1" *-- "0..*" Stock
Stock "0..*" --> "1" Product


' =========================
' Поставки
' =========================

class Supplier {
    - id: int
    - name: String
    - phone: String
    - email: String
}

class Supply {
    - id: int
    - supplyDate: DateTime
    - status: SupplyStatus
    + calculateTotal(): Decimal
}

class SupplyItem {
    - id: int
    - quantity: int
    - purchasePrice: Decimal
    + getTotalPrice(): Decimal
}

enum SupplyStatus {
    CREATED
    IN_TRANSIT
    RECEIVED
    CANCELLED
}

Supplier "1" -- "0..*" Supply
Supply "1" *-- "1..*" SupplyItem
SupplyItem "0..*" --> "1" Product
Supply "0..*" --> "1" Warehouse


' =========================
' Сотрудники
' =========================

class Staff {
    - id: int
    - firstName: String
    - lastName: String
    - position: String
    - phone: String
    + processOrder(order: Order)
    + acceptSupply(supply: Supply)
}

Staff "0..*" -- "1" Warehouse
Staff "1" -- "0..*" Order : processes

@enduml