import { type ActorRefLike, type InspectionEvent } from "xstate";

import { logger } from "../core";

// Mirrors @statelyai/inspect's ActorRefLikeWithData — the inspect
// callback receives full Actor instances at runtime, but the type is
// narrowed for @xstate/store compat.
type ActorRefWithAncestry = ActorRefLike & {
  id?: string;
  _parent?: ActorRefWithAncestry;
};

const actorPath = (ref: ActorRefWithAncestry): string => {
  const segments: string[] = [];
  let current: ActorRefWithAncestry | undefined = ref;
  while (current) {
    segments.unshift(current.id ?? current.sessionId);
    current = current._parent;
  }
  return segments.join(":");
};

/** @internal exported for testing */
export const inspect = (event: InspectionEvent): void => {
  const ref = event.actorRef as ActorRefWithAncestry;
  const log = logger.child(actorPath(ref));

  switch (event.type) {
    case "@xstate.snapshot": {
      log.debug("snapshot", event.snapshot);
      break;
    }
    case "@xstate.event":
      log.debug("event", event.event);
      break;
    case "@xstate.action":
      log.debug("action", event.action);
      break;
  }
};