# Add item sequence

```mermaid
sequenceDiagram
    participant Controller as StoreController
    participant UseCase as AddItem Use Case
    participant Clock as IClock
    participant Policy as ExpirationPolicy
    participant OrderService as OrderingService
    participant HttpClient as HttpClient
    participant Repo as IItemRepository

    Controller->>UseCase: execute(item)

    UseCase->>Clock: getCurrentTime()
    Clock-->>UseCase: DateTime

    UseCase->>Policy: IsExpired(item, currentTime)
    Policy-->>UseCase: boolean

    alt Item is expired
        UseCase->>OrderService: orderItem(item)
        OrderService->>HttpClient: POST to order URL
        HttpClient-->>OrderService: Response
        OrderService-->>UseCase: OrderResult
    end

    UseCase->>Repo: save(item)
    Repo->>Repo: Persist to storage
    Repo-->>UseCase: Saved Item ID

    UseCase-->>Controller: Result (success/error)
```