lib/mobile/pwa.ts

'use client';

/**
 * PWA utilities: install prompt, registration, update detection.
 */

let deferredPrompt: BeforeInstallPromptEvent | null = null;

interface BeforeInstallPromptEvent extends Event {
  prompt(): Promise<void>;
  userChoice: Promise<{ outcome: 'accepted' | 'dismissed' }>;
}

export function initPWA(): void {
  if (typeof window === 'undefined') return;

  window.addEventListener('beforeinstallprompt', (e: Event) => {
    e.preventDefault();
    deferredPrompt = e as BeforeInstallPromptEvent;
    window.dispatchEvent(new CustomEvent('pwa-installable'));
  });

  window.addEventListener('appinstalled', () => {
    deferredPrompt = null;
    window.dispatchEvent(new CustomEvent('pwa-installed'));
  });
}

export function canInstallPWA(): boolean {
  return deferredPrompt !== null;
}

export async function installPWA(): Promise<boolean> {
  if (!deferredPrompt) return false;

  await deferredPrompt.prompt();
  const { outcome } = await deferredPrompt.userChoice;
  deferredPrompt = null;
  return outcome === 'accepted';
}

export function isPWAInstalled(): boolean {
  if (typeof window === 'undefined') return false;
  return (
    window.matchMedia('(display-mode: standalone)').matches ||
    (window.navigator as Navigator & { standalone?: boolean }).standalone === true
  );
}