package service

import "github.com/vasyakrg/dns-autoresolver/internal/diff"

// Domain check statuses persisted in domains.last_check_status. "unknown" is
// the DB default for a domain that has never been checked. Single source of
// truth — the scheduler aliases these, the API check handler writes them.
const (
	StatusUnknown = "unknown"
	StatusInSync  = "in_sync"
	StatusDrift   = "drift"
	StatusError   = "error"
)

// DeriveStatus maps a successful check's changeset to a domain status:
// actionable drift (managed adds/updates/prunes) → "drift", otherwise
// "in_sync". A failed check (provider/loader error) is "error" and handled by
// the caller, which has the error in hand.
func DeriveStatus(cs diff.Changeset) string {
	if len(cs.Actionable()) > 0 {
		return StatusDrift
	}
	return StatusInSync
}