Subscribe to Web Push

curl -X POST https://api.bio.re/api/v1/notifications/webpush/subscribe \
  -H "Authorization: Bearer $ACCESS_TOKEN" \
  -H 'Content-Type: application/json' \
  -d '{
    "endpoint": "https://push.example.com/abc123...",
    "p256dh": "BHV1...",
    "auth": "8Pgv...",
    "userAgent": "Mozilla/5.0 ..."
  }'

type WebPushSubscribeInput = {
  endpoint: string;
  p256dh: string;
  auth: string;
  userAgent?: string;
};

async function subscribeWebPush(
  accessToken: string,
  input: WebPushSubscribeInput,
): Promise<string> {
  const res = await fetch('https://api.bio.re/api/v1/notifications/webpush/subscribe', {
    method: 'POST',
    headers: {
      Authorization: `Bearer ${accessToken}`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(input),
  });
  const json = await res.json();
  if (!res.ok || !json.success) {
    throw new Error(json?.error?.message ?? 'Web push subscribe failed');
  }
  return json.subscriptionId as string;
}

// 1. Register service worker (typically in app boot)
const registration = await navigator.serviceWorker.register('/sw.js');

// 2. Request notification permission
const permission = await Notification.requestPermission();
if (permission !== 'granted') {
  throw new Error('Notification permission denied');
}

// 3. Subscribe to push (VAPID public key from your platform config)
const VAPID_PUBLIC_KEY = process.env.NEXT_PUBLIC_VAPID_PUBLIC_KEY!;

function urlBase64ToUint8Array(base64String: string): Uint8Array {
  const padding = '='.repeat((4 - (base64String.length % 4)) % 4);
  const base64 = (base64String + padding).replace(/-/g, '+').replace(/_/g, '/');
  const raw = atob(base64);
  return Uint8Array.from(raw, (c) => c.charCodeAt(0));
}

const subscription = await registration.pushManager.subscribe({
  userVisibleOnly: true,
  applicationServerKey: urlBase64ToUint8Array(VAPID_PUBLIC_KEY),
});

// 4. Extract keys + send to platform
function arrayBufferToBase64(buffer: ArrayBuffer | null): string {
  if (!buffer) return '';
  const bytes = new Uint8Array(buffer);
  let binary = '';
  for (let i = 0; i < bytes.length; i++) binary += String.fromCharCode(bytes[i]);
  return btoa(binary);
}

const subscriptionId = await subscribeWebPush(accessToken, {
  endpoint: subscription.endpoint,
  p256dh: arrayBufferToBase64(subscription.getKey('p256dh')),
  auth: arrayBufferToBase64(subscription.getKey('auth')),
  userAgent: navigator.userAgent,
});

console.log('Web push subscription registered:', subscriptionId);