import { useEffect } from 'react';
import { useNavigate } from 'react-router';
import { useAuthStore } from './auth-store';
import { Spinner } from '@cameleer/design-system';
import { fetchConfig } from '../config';

export function CallbackPage() {
  const navigate = useNavigate();
  const login = useAuthStore((s) => s.login);

  useEffect(() => {
    const params = new URLSearchParams(window.location.search);
    const code = params.get('code');
    if (!code) {
      navigate('/login');
      return;
    }

    const redirectUri = `${window.location.origin}/callback`;

    fetchConfig().then((config) => {
      fetch(`${config.logtoEndpoint}/oidc/token`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        body: new URLSearchParams({
          grant_type: 'authorization_code',
          code,
          client_id: config.logtoClientId,
          redirect_uri: redirectUri,
        }),
      })
        .then((r) => r.json())
        .then((data) => {
          if (data.access_token) {
            login(data.access_token, data.refresh_token || '');
            navigate('/');
          } else {
            navigate('/login');
          }
        })
        .catch(() => navigate('/login'));
    });
  }, [login, navigate]);

  return (
    <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'center', minHeight: '100vh' }}>
      <Spinner />
    </div>
  );
}