fcm

var (
	// ErrInvalidMessage occurs if push notitication message is nil.
	ErrInvalidMessage = errors.New("message is invalid")

	// ErrInvalidTarget occurs if message topic is empty.
	ErrInvalidTarget = errors.New("topic is invalid or registration ids are not set")

	// ErrToManyRegIDs occurs when registration ids more then 1000.
	ErrToManyRegIDs = errors.New("too many registrations ids")

	// ErrInvalidTimeToLive occurs if TimeToLive more then 2419200.
	ErrInvalidTimeToLive = errors.New("messages time-to-live is invalid")
)

var (
	// ErrMissingRegistration occurs if registration token is not set.
	ErrMissingRegistration = errors.New("missing registration token")

	// ErrInvalidRegistration occurs if registration token is invalid.
	ErrInvalidRegistration = errors.New("invalid registration token")

	// ErrNotRegistered occurs when application was deleted from device and
	// token is not registered in FCM.
	ErrNotRegistered = errors.New("unregistered device")

	// ErrInvalidPackageName occurs if package name in message is invalid.
	ErrInvalidPackageName = errors.New("invalid package name")

	// ErrMismatchSenderID occurs when application has a new registration token.
	ErrMismatchSenderID = errors.New("mismatched sender id")

	// ErrMessageTooBig occurs when message is too big.
	ErrMessageTooBig = errors.New("message is too big")

	// ErrInvalidDataKey occurs if data key is invalid.
	ErrInvalidDataKey = errors.New("invalid data key")

	// ErrInvalidTTL occurs when message has invalid TTL.
	ErrInvalidTTL = errors.New("invalid time to live")

	// ErrUnavailable occurs when FCM service is unavailable. It makes sense
	// to retry after this error.
	ErrUnavailable = connectionError("timeout")

	// ErrInternalServerError is internal FCM error. It makes sense to retry
	// after this error.
	ErrInternalServerError = serverError("internal server error")

	// ErrDeviceMessageRateExceeded occurs when client sent to many requests to
	// the device.
	ErrDeviceMessageRateExceeded = errors.New("device message rate exceeded")

	// ErrTopicsMessageRateExceeded occurs when client sent to many requests to
	// the topics.
	ErrTopicsMessageRateExceeded = errors.New("topics message rate exceeded")

	// ErrInvalidParameters occurs when provided parameters have the right name and type
	ErrInvalidParameters = errors.New("check that the provided parameters have the right name and type")

	// ErrUnknown for unknown error type
	ErrUnknown = errors.New("unknown error type")
)

var (
	// ErrInvalidAPIKey occurs if API key is not set.
	ErrInvalidAPIKey = errors.New("client API Key is invalid")
)