// Per-install setting for PIN-idle-auto-lock. 0 = disabled.
// Values match the dropdown options (5/15/30/60 minutes).

const KEY = 'chatapp.autoLockMinutes.v1';

export type AutoLockMinutes = 0 | 5 | 15 | 30 | 60;

const VALID: AutoLockMinutes[] = [0, 5, 15, 30, 60];

export function getAutoLockMinutes(): AutoLockMinutes {
  try {
    const raw = window.localStorage.getItem(KEY);
    if (!raw) return 0;
    const n = Number(raw);
    if (VALID.includes(n as AutoLockMinutes)) return n as AutoLockMinutes;
    return 0;
  } catch {
    return 0;
  }
}

type Listener = (value: AutoLockMinutes) => void;
const listeners = new Set<Listener>();

export function subscribeAutoLockSetting(l: Listener): () => void {
  listeners.add(l);
  return () => listeners.delete(l);
}

export function notifyAutoLockChanged(value: AutoLockMinutes): void {
  for (const l of listeners) {
    try { l(value); } catch (err) { console.warn(err); }
  }
}

export function setAutoLockMinutes(value: AutoLockMinutes): void {
  try {
    window.localStorage.setItem(KEY, String(value));
  } catch {
    /* quota */
  }
  notifyAutoLockChanged(value);
}