import React from 'react';
import ReactDOM from 'react-dom/client';
import { PublicClientApplication, EventType, EventMessage, AuthenticationResult } from '@azure/msal-browser';
import { MsalProvider } from '@azure/msal-react';
import App from './App';
import { msalConfig } from './services/authConfig';

// Create MSAL instance
const msalInstance = new PublicClientApplication(msalConfig);

// Initialize MSAL and render app
msalInstance.initialize().then(() => {
  // Check if there are accounts and set the first one as active
  const accounts = msalInstance.getAllAccounts();
  if (accounts.length > 0) {
    msalInstance.setActiveAccount(accounts[0]);
  }

  // Listen for sign-in events to set active account
  msalInstance.addEventCallback((event: EventMessage) => {
    if (event.eventType === EventType.LOGIN_SUCCESS && event.payload) {
      const payload = event.payload as AuthenticationResult;
      msalInstance.setActiveAccount(payload.account);
    }
  });

  const rootElement = document.getElementById('root');
  if (!rootElement) {
    throw new Error("Could not find root element to mount to");
  }

  const root = ReactDOM.createRoot(rootElement);
  root.render(
    <React.StrictMode>
      <MsalProvider instance={msalInstance}>
        <App />
      </MsalProvider>
    </React.StrictMode>
  );
});