package balancer

type failover struct{}

// Failover returns a strategy that always picks the first healthy endpoint.
// If the primary endpoint is unhealthy, it falls back to the next available
// healthy endpoint in order.
func Failover() Strategy {
	return &failover{}
}

func (f *failover) Next(healthy []Endpoint) (Endpoint, error) {
	if len(healthy) == 0 {
		return Endpoint{}, ErrNoHealthy
	}
	return healthy[0], nil
}