function createConversationActionHydrator({ load, activate }) {
  let actions = null;
  let pending = null;
  const wiredRoots = new WeakSet();

  function ensure() {
    if (actions) return Promise.resolve(actions);
    if (!pending) {
      pending = load().then(() => {
        actions = activate();
        return actions;
      }).catch(error => {
        pending = null;
        throw error;
      });
    }
    return pending;
  }

  function show({ root, state, paint, wire, retry }) {
    if (actions) {
      retry.hidden = true;
      if (!wiredRoots.has(root)) {
        wire(actions);
        wiredRoots.add(root);
      }
      paint(state, actions);
      return Promise.resolve(true);
    }

    paint(state, null);
    retry.hidden = true;
    return ensure().then(controller => {
      if (!wiredRoots.has(root)) {
        wire(controller);
        wiredRoots.add(root);
      }
      paint(state, controller);
      return true;
    }).catch(() => {
      retry.hidden = false;
      return false;
    });
  }

  return { show, ready: () => Boolean(actions) };
}

if (typeof module !== 'undefined' && module.exports) module.exports = createConversationActionHydrator;