package control

import "net/netip"

// Role identifies a peer's role in a ping exchange with a specific remote peer.
type Role string

const (
	// Client initiates pings and measures RTT.
	Client Role = "CLIENT"
	// Server responds to pings.
	Server Role = "SERVER"
)

// RoleFor returns the Role of local relative to remote.
// The peer with the lower VPN IP is the client.
func RoleFor(local, remote netip.Addr) Role {
	if local.Compare(remote) < 0 {
		return Client
	}
	return Server
}