types

type Assets interface {
	// LoadAsset loads the asset with the given key.
	LoadAsset(ctx context.Context, key string) (io.ReadCloser, error)
}

type Bot interface {
	// Handle register bot's handler with filter.
	Handle(EventFilter, Handler)

	// Start bot.
	Start() error

	// Stop bot.
	Stop() error
}

type ChatID int64

type Context interface {

	// Set context value.
	Set(ctx.Context, string) error

	// Reset context.
	Reset(ctx.Context) error

	// Check context value.
	Check(ctx.Context, string) (bool, error)
}

type ContextProvider interface {
	UserContext(ChatID) Context
}

type EventFilter interface {
	Check(context.Context, *telegram.Update) (bool, error)
}

type Handler interface {
	Handle(context.Context, *telegram.Update, *telegram.BotAPI) error
}

type PaymentProviders interface {
	PaymentToken(name string) string
}

type State interface {
	Get(key string) (string, bool)
	Set(key, value string)
	Delete(key string)
	Map() map[string]string
	Fill(map[string]string)
	Changes() StateChanges
}

type StateChanges struct {
	Added   []string
	Removed []string
}

type StateOp interface {
	Apply(State, ...func(string) string)
}

type StateProvider interface {
	Load(context.Context, ChatID, State) error
	Update(context.Context, ChatID, State) error
}