/**
 * Voice settings that live in the browser only. Every access sits in
 * try/catch: private windows and blocked site data make localStorage throw,
 * and the default (no consent, notice not seen) is the safe answer then.
 */
const CLOUD_CONSENT_KEY = "apicore.voice.cloud-consent";
const NOTICE_SEEN_KEY = "apicore.voice.notice-seen";

function readFlag(key: string): boolean {
  try {
    return window.localStorage.getItem(key) === "1";
  } catch {
    return false;
  }
}

function writeFlag(key: string, value: boolean): void {
  try {
    if (value) {
      window.localStorage.setItem(key, "1");
    } else {
      window.localStorage.removeItem(key);
    }
  } catch {
    // Storage is a convenience here; without it the flag simply stays at its default.
  }
}

export function getCloudRecognitionConsent(): boolean {
  return readFlag(CLOUD_CONSENT_KEY);
}

const consentListeners = new Set<() => void>();

/** For useSyncExternalStore: re-reads after this tab or another tab changed the consent. */
export function subscribeCloudRecognitionConsent(listener: () => void): () => void {
  consentListeners.add(listener);
  const onStorage = (event: StorageEvent) => {
    if (event.key === CLOUD_CONSENT_KEY || event.key === null) {
      listener();
    }
  };
  window.addEventListener("storage", onStorage);
  return () => {
    consentListeners.delete(listener);
    window.removeEventListener("storage", onStorage);
  };
}

export function setCloudRecognitionConsent(value: boolean): void {
  writeFlag(CLOUD_CONSENT_KEY, value);
  consentListeners.forEach((listener) => listener());
}

export function hasSeenRecordingNotice(): boolean {
  return readFlag(NOTICE_SEEN_KEY);
}

export function markRecordingNoticeSeen(): void {
  writeFlag(NOTICE_SEEN_KEY, true);
}