package main

import (
	"fmt"
	"log"

	"libvirt.org/go/libvirt"
)
// GuestVM holds a handle is used to communicate to Domains
type GuestVM struct {
	Name      string
	ID        uint
	BackupXML string

	close    chan struct{}
	closeErr chan error
	dom      *libvirt.Domain
}

// GetGuest loads guest information by name and returns it
func GetGuest(name string, conn *libvirt.Connect) (*GuestVM, error) {
	g := &GuestVM{
		Name: name,
		close:    make(chan struct{}),
		closeErr: make(chan error),
	}

	var err error

	if g.dom, err = conn.LookupDomainByName(name); err != nil {
		return nil, err
	}
	if g.ID, err = g.dom.GetID(); err != nil {
		return nil, err
	}
	if g.BackupXML, err = g.dom.BackupGetXMLDesc(0); err != nil {
		return nil, err
	}

	go func() {
		defer close(g.closeErr)
		<-g.close
		g.closeErr <- g.dom.Free()
	}()

	return g, nil
}

// Close closes an open connection
func (g *GuestVM) Close() error {
	close(g.close)
	return <-g.closeErr
}