workspace/src/lib/firebase-admin.ts

import { initializeApp, getApps, App, cert, ServiceAccount } from 'firebase-admin/app';
import { getDatabase } from 'firebase-admin/database';
import { getFirestore } from 'firebase-admin/firestore';
import { getMessaging } from 'firebase-admin/messaging';
import serviceAccount from '@/../service-account.json';

// Correctly type the service account object for the cert function
const serviceAccountInfo: ServiceAccount = {
  projectId: serviceAccount.project_id,
  privateKey: serviceAccount.private_key,
  clientEmail: serviceAccount.client_email,
};

const firebaseAdminConfig = {
    credential: cert(serviceAccountInfo),
    databaseURL: process.env.NEXT_PUBLIC_FIREBASE_DATABASE_URL,
};

let adminApp: App;
if (!getApps().length) {
    adminApp = initializeApp(firebaseAdminConfig);
} else {
    adminApp = getApps()[0];
}

const adminDb = getDatabase(adminApp);
const adminFirestore = getFirestore(adminApp);
const adminMessaging = getMessaging(adminApp);

export { adminApp, adminDb, adminFirestore, adminMessaging };