package kvm2

import (
	"net/netip"

	"github.com/digitalocean/go-libvirt"

	"gitea.home.hrajfrisbee.cz/kacerr/egress-proxies-operator/internal/provider"
)

// mapState turns a libvirt domain state plus the discovered address into the
// contract's state. nostate means libvirt could not tell, so the next poll
// decides; an active domain is Running only once it has an address; every
// inactive state, and anything unknown, is Stopped, which the reconciler
// answers by replacing the instance.
func mapState(s libvirt.DomainState, ip string) provider.InstanceState {
	switch {
	case s == libvirt.DomainNostate:
		return provider.StateProvisioning
	case isActive(s) && ip == "":
		return provider.StateProvisioning
	case isActive(s):
		return provider.StateRunning
	default:
		return provider.StateStopped
	}
}

func isActive(s libvirt.DomainState) bool {
	return s == libvirt.DomainRunning || s == libvirt.DomainBlocked
}

// firstIPv4 picks the first usable IPv4 address from the guest's interfaces:
// not loopback, not link-local, not unspecified. Empty means no address yet.
func firstIPv4(ifaces []libvirt.DomainInterface) string {
	for _, iface := range ifaces {
		for _, a := range iface.Addrs {
			if libvirt.IPAddrType(a.Type) != libvirt.IPAddrTypeIpv4 {
				continue
			}
			addr, err := netip.ParseAddr(a.Addr)
			if err != nil || !addr.Is4() || addr.IsLoopback() || addr.IsLinkLocalUnicast() || addr.IsUnspecified() {
				continue
			}
			return addr.String()
		}
	}
	return ""
}