backend

type FakeStock struct {
	Items map[string]*FakeStockItem
}

type FakeStockItem struct {
	StockItem
	sync.RWMutex
}

type FakeTransaction struct {
	Transaction
	sync.RWMutex
}

type FakeTransactions struct {
	// contains filtered or unexported fields
}

type Stock interface {
	// GetAll returns all items currently in the vending machine (available or not)
	GetAll(context.Context) ([]*StockItem, error)
	// GetItem returns information specific to a single item
	GetItem(ctx context.Context, ID string) (*StockItem, error)
	// ReserveItem indicates that you are queued to vend an item and it's unavailable for other vends
	ReserveItem(ctx context.Context, ID string) error
	// UpdateItem updates the stock with the result of your recent vend attempt.
	UpdateItem(ctx context.Context, ID string, status vend.Result) error
}

type StockItem struct {
	ID       string
	Name     string
	Quantity uint8
	Reserved uint8
	Image    string
	Price    uint64
	Location uint8
	Broken   bool
}

type Transaction struct {
	ID         uuid.UUID        `json:"id"`
	Item       string           `json:"-"`
	Amount     uint64           `json:"-"`
	ProviderID string           `json:"-"`
	User       string           `json:"-"` // Name + email of person doing this
	State      TransactionState `json:"state"`
	Date       time.Time        `json:"-"`
	Reason     string           `json:"reason,omitempty"` // If something went wrong - what
}

type TransactionState uint8

type Transactions interface {
	// New creates a transaction from the passed info and returns it
	New(ctx context.Context, item *StockItem, user string) (*Transaction, error)
	// Get returns an existing transaction or nil if it doesn't exist
	Get(ctx context.Context, ID string) (*Transaction, error)
	// Update updates an existing transaction to the new state.
	// Note: It will only update the fields ProviderID, State and Reason.
	Update(ctx context.Context, txn *Transaction) error
}