package events

// ErrorLevel is the level of the ServerError
type ErrorLevel string

// Status is the status of an event
type Status string

// Different ErrorLevels and statuses
const (
	// ErrorLevel
	WarningError ErrorLevel = "warning"
	FatalError   ErrorLevel = "fatal"
	// Statuses
	OK           Status = "ok"
	Disconnected Status = "disconnected"
	Error        Status = "error"
)

// Event is the base of a message
type Event struct {
	Type   string `json:"type"`
	Status Status `json:"status"`
}

// ClientMessage represents a message sent by the client
type ClientMessage struct {
	Event
	Message string `json:"message"`
}

// ServerEvent represents an event sent to the client
type ServerEvent struct {
	Event
	Data interface{} `json:"message"`
}

// ErrorEvent represents an event error
type ErrorEvent struct {
	Level   ErrorLevel `json:"level"`
	Message string     `json:"message"`
}

// ServerError represents an error sent to the client
type ServerError struct {
	Event
	ErrorEvent `json:"error"`
}

// Eventer define an interface that any eventer must follow
type Eventer interface {
	Unsubscribe(chanl *Channel) error
	Append(chanl *Channel)
	Subscribers() []*Channel
	NotifyAll(data interface{})
	Launch() error
	Finish()
}