package hostguard

import "context"

func (a *RootAuthority) HostRetired(ctx context.Context, host string) (bool, error) {
	if err := ctx.Err(); err != nil {
		return false, err
	}
	if a == nil || a.store == nil || validateFileHost(host) != nil {
		return false, ErrInvalidInput
	}
	unlock, err := a.store.Lock(ctx, host+".lock")
	if err != nil {
		return false, err
	}
	defer unlock()
	r, err := a.read(host)
	if err != nil {
		return false, err
	}
	if r.quarantined || r.pendingInstallation != nil || r.barrier != nil {
		return false, ErrFenced
	}
	if r.ActiveStamp != 0 {
		return false, nil
	}
	for _, old := range r.rootRetired {
		if old.Incarnation == r.installation.Incarnation && old.Stamp == r.installation.Stamp && old.Stamp != 0 {
			return true, nil
		}
	}
	return false, nil
}