import AsyncStorage from "@react-native-async-storage/async-storage";

import type { ParsedShortcut } from "@/lib/shortcuts";

const STORAGE_KEY = "beenvoice:pending-shortcut";

let memory: ParsedShortcut | null = null;
const listeners = new Set<() => void>();

function notify() {
  for (const listener of listeners) {
    listener();
  }
}

export async function enqueueShortcut(shortcut: ParsedShortcut): Promise<void> {
  memory = shortcut;
  await AsyncStorage.setItem(STORAGE_KEY, JSON.stringify(shortcut));
  notify();
}

export async function peekPendingShortcut(): Promise<ParsedShortcut | null> {
  if (memory) return memory;

  const raw = await AsyncStorage.getItem(STORAGE_KEY);
  if (!raw) return null;

  try {
    memory = JSON.parse(raw) as ParsedShortcut;
    return memory;
  } catch {
    await AsyncStorage.removeItem(STORAGE_KEY);
    return null;
  }
}

export async function clearPendingShortcut(): Promise<void> {
  memory = null;
  await AsyncStorage.removeItem(STORAGE_KEY);
}

export function subscribeShortcutQueue(listener: () => void): () => void {
  listeners.add(listener);
  return () => listeners.delete(listener);
}

export async function hasPendingShortcut(): Promise<boolean> {
  return (await peekPendingShortcut()) != null;
}