/**
 * Push Notification Service
 *
 * Uses web-push with VAPID keys for browser push notifications.
 */

import webpush from 'web-push';

const VAPID_PUBLIC_KEY = process.env.VAPID_PUBLIC_KEY || '';
const VAPID_PRIVATE_KEY = process.env.VAPID_PRIVATE_KEY || '';
const VAPID_SUBJECT = process.env.VAPID_SUBJECT || 'mailto:analytics@rainmakersports.app';

if (VAPID_PUBLIC_KEY && VAPID_PRIVATE_KEY) {
  webpush.setVapidDetails(VAPID_SUBJECT, VAPID_PUBLIC_KEY, VAPID_PRIVATE_KEY);
}

interface PushSubscription {
  endpoint: string;
  keys: { p256dh: string; auth: string };
}

interface PushPayload {
  title: string;
  body: string;
  icon?: string;
  badge?: string;
  url?: string;
  tag?: string;
}

export async function sendPushNotification(
  subscription: PushSubscription,
  payload: PushPayload
): Promise<boolean> {
  if (!VAPID_PUBLIC_KEY || !VAPID_PRIVATE_KEY) {
    console.warn('Push: VAPID keys not configured');
    return false;
  }
  try {
    await webpush.sendNotification(
      {
        endpoint: subscription.endpoint,
        keys: {
          p256dh: subscription.keys.p256dh,
          auth: subscription.keys.auth,
        },
      },
      JSON.stringify(payload),
      { TTL: 3600 }
    );
    return true;
  } catch (err: any) {
    if (err.statusCode === 410 || err.statusCode === 404) {
      // Subscription expired or invalid — caller should deactivate
      return false;
    }
    console.error('Push send error:', err);
    return false;
  }
}

export function getVapidPublicKey(): string {
  return VAPID_PUBLIC_KEY;
}