// OS notifications via the Electron preload bridge. The exported API
// stays identical to the Tauri-era version so callers don't change.
//
// Permission under Electron is implicit ('granted' always). The legacy
// ASKED marker in localStorage is kept so we don't re-prompt after a
// previously-denied run; we just fast-succeed now.

import { isTauriRuntime } from './globalShortcut';

let permissionChecked = false;
let permissionGranted = false;

const ASKED_KEY = 'chatapp.notif.asked';

function writeAskedMarker(): void {
  try {
    window.localStorage.setItem(ASKED_KEY, '1');
  } catch {
    /* quota / private mode */
  }
}

export async function ensureNotificationPermission(): Promise<boolean> {
  if (permissionChecked) return permissionGranted;
  permissionChecked = true;
  if (!isTauriRuntime()) {
    permissionGranted = false;
    return false;
  }
  try {
    const state = await window.electronAPI.getNotificationPermission();
    permissionGranted = state === 'granted';
    writeAskedMarker();
  } catch (err: unknown) {
    permissionGranted = false;
    console.warn('notification permission check failed', err);
  }
  return permissionGranted;
}

export function isAppFocused(): boolean {
  return typeof document !== 'undefined' && !document.hidden && document.hasFocus();
}

interface NotifyOpts {
  title: string;
  body?: string;
  /** Force notification even when app is focused. Default: suppress if focused. */
  force?: boolean;
}

export async function notify({ title, body, force = false }: NotifyOpts): Promise<void> {
  if (!force && isAppFocused()) return;
  if (!isTauriRuntime()) return;
  const granted = await ensureNotificationPermission();
  if (!granted) return;
  try {
    await window.electronAPI.notify({
      title,
      body: body ?? '',
      silent: true,
    });
  } catch (err: unknown) {
    console.error('notify failed', err);
  }
}