package catalogue

import (
	"fmt"
	"strings"
)

// AttachedNetwork is one network a machine said it is directly attached to: the link it is on and the
// network as address and prefix (novox/hq ADR 0340 §7), as the node-engine reports it among its facts.
type AttachedNetwork struct {
	Link    string `json:"link"`
	Network string `json:"network"`
}

// LocalNetwork is one attached network judged: whether it counts as this machine's local network for a
// port reached from `local-network`, and why — said for one that counts as well as for one that does
// not, so `node` can show which counted and why the others did not (ADR 0340 §8).
type LocalNetwork struct {
	Link    string
	Network string
	Counts  bool
	Why     string
}

// LocalNetworkPort is one port the filter admits from `local-network`, and what that resolved to on this
// machine (ADR 0340 §8): what `plan` shows for it.
type LocalNetworkPort struct {
	Port     int
	Protocol string
	Because  []string
	// Networks is the local networks it is admitted from; empty when the machine reported none (§6).
	Networks []string
}

// Said is how `plan` says one such port: the networks, or that there are none and the port is admitted
// from the private network only.
func (p LocalNetworkPort) Said() string {
	by := strings.Join(p.Because, ", ")
	if len(p.Networks) == 0 {
		return fmt.Sprintf("%s/%d (%s) from the local network: none — this machine reported no private "+
			"network on a link facing outside, so it is admitted from the private network only", p.Protocol, p.Port, by)
	}
	return fmt.Sprintf("%s/%d (%s) from the local network: %s, and the private network", p.Protocol, p.Port, by,
		strings.Join(p.Networks, ", "))
}