package diffsync

type Shadow struct {
	localVersion  Version
	remoteVersion Version
	content       []byte
	backup        *Backup
}

func NewShadow(content []byte) *Shadow {
	return &Shadow{
		localVersion:  0,
		remoteVersion: 0,
		content:       content,
		backup:        NewBackup(Copy(content)),
	}
}

func (s *Shadow) LocalVersion() Version {
	return s.localVersion
}

func (s *Shadow) RemoteVersion() Version {
	return s.remoteVersion
}

func (s *Shadow) Content() []byte {
	return s.content
}

func (s *Shadow) Backup() *Backup {
	return s.backup
}

func Copy(content []byte) []byte {
	contentCopy := make([]byte, len(content))
	copy(contentCopy, content)

	return contentCopy
}