package e2ee

// Manager holds the process-wide selected E2EE backend (or none, if E2EE
// is disabled), reachable from both the xmpp and telegram packages without
// either importing the other's e2ee-specific glue (see gateway.E2EE, set by
// xmpp.NewComponent, which both packages already import).
type Manager struct {
	backend Backend
}

// NewManager wraps backend for process-wide access. Pass nil to represent
// E2EE being disabled - every call site is expected to treat that the same
// as "behave exactly as if this feature didn't exist" (see Backend's ok
// return).
func NewManager(backend Backend) *Manager {
	return &Manager{backend: backend}
}

// Backend returns the selected backend. ok is false if m is nil or backend
// was nil (E2EE disabled) - callers should treat a nil Manager the same as
// one built via NewManager(nil).
func (m *Manager) Backend() (backend Backend, ok bool) {
	if m == nil || m.backend == nil {
		return nil, false
	}
	return m.backend, true
}