bingo

type Service interface {
	// create a new bingo game and return its ID
	CreateGame(context.Context) (game.ID, error)

	// create a new ticket for gameID with username
	CreateTicket(context.Context, game.ID, string) (ticket.ID, error)

	// display ticket as HTML
	ShowTicket(context.Context, ticket.ID) (Ticket, error)

	// generate a random number, which has not been picked earlier for this game
	GenerateNumber(context.Context, game.ID) (int64, error)

	// returns all numbers generated so far for a game
	GetAllNumbers(context.Context, game.ID) ([]int64, error)

	// returns stats for a game.
	GetStats(context.Context, game.ID) (numbersDrawn, ticketsGenerated int, err error)
}

type Ticket struct {
	Username string  `json:"username,omitempty"`
	Cells    []int64 `json:"cells,omitempty"`
}