import * as Effect from "effect/Effect";
import * as References from "effect/References";

const snapshotStack = (
  frame: References.StackFrame | undefined,
): References.StackFrame | undefined => {
  if (frame === undefined) return undefined;
  const stack = frame.stack();
  return { name: frame.name, stack: () => stack, parent: snapshotStack(frame.parent) };
};

/**
 * Wrap a `Cache.get` so its lookup fiber inherits a materialized stack. The lazy
 * caller frame would otherwise retain the caller's request snapshot for the TTL.
 * Stay untraced so this helper does not introduce another lazy frame to retain.
 */
export const detachStackFrame = Effect.fnUntraced(function* <A, E, R>(
  effect: Effect.Effect<A, E, R>,
) {
  const frame = snapshotStack(yield* References.CurrentStackFrame);
  return yield* Effect.provideService(effect, References.CurrentStackFrame, frame);
});