product

type Decimal int64

type ProductItem struct {
	ID           int64   `json:"id"`
	Name         string  `json:"name"`
	Price        Decimal `json:"price"`
	Manufacturer string  `json:"manufacturer"`
}

type Repository interface {
	GetProducts(ctx context.Context, page int64, pageSize int64) ([]ProductItem, error)
	GetProductByID(ctx context.Context, id int64) (ProductItem, error)
	AddProduct(ctx context.Context, item *ProductItem) (ProductItem, error)
	UpdateProduct(ctx context.Context, item *ProductItem) (ProductItem, error)
	RemoveProduct(ctx context.Context, id int64) (int64, error)
}

type Service interface {
	GetProducts(ctx context.Context, page int64, pageSize int64) ([]ProductItem, error)
	GetProductByID(ctx context.Context, id int64) (ProductItem, error)
	AddProduct(
		ctx context.Context,
		name string,
		price Decimal,
		manufacturer string,
	) (ProductItem, error)
	UpdateProduct(
		ctx context.Context,
		id int64,
		name string,
		price Decimal,
		manufacturer string,
	) (ProductItem, ServiceError)
	RemoveProduct(ctx context.Context, id int64) (int64, ServiceError)
}

type ServiceError interface {
	Message() string
	StatusCode() ServiceStatusCode
}

type ServiceStatusCode string