/**
 * @ai-summary Auth0 callback handler page - routes users based on their status
 * @ai-context Fetches user status after Auth0 callback and redirects appropriately
 */

import React, { useEffect } from 'react';
import { useNavigate, useLocation } from 'react-router-dom';
import { useUserStatus } from '../../../core/auth/useUserStatus';

export const CallbackPage: React.FC = () => {
  const navigate = useNavigate();
  const location = useLocation();
  const { data: userStatus, isLoading, error } = useUserStatus();

  // Get returnTo from location state (passed from Auth0Provider onRedirectCallback)
  const returnTo = (location.state as { returnTo?: string })?.returnTo || '/garage';

  useEffect(() => {
    if (isLoading) return;

    if (error) {
      console.error('[CallbackPage] Error fetching user status:', error);
      // On error, redirect to garage and let normal auth flow handle it
      navigate('/garage', { replace: true });
      return;
    }

    if (userStatus) {
      // Note: Unverified users should never reach this page if Auth0 action is configured
      // But as a safety check, redirect to verify-email if not verified
      if (!userStatus.emailVerified) {
        console.log('[CallbackPage] User not verified, redirecting to verify-email');
        navigate('/verify-email', { replace: true });
        return;
      }

      // Check if onboarding is completed
      if (!userStatus.onboardingCompleted) {
        console.log('[CallbackPage] User not onboarded, redirecting to onboarding');
        navigate('/onboarding', { replace: true });
        return;
      }

      // User is verified and onboarded - go to requested destination
      console.log('[CallbackPage] User verified and onboarded, redirecting to:', returnTo);
      navigate(returnTo, { replace: true });
    }
  }, [userStatus, isLoading, error, navigate, returnTo]);

  return (
    <div className="min-h-screen bg-gradient-to-br from-slate-50 via-white to-rose-50 dark:from-paper dark:via-nero dark:to-paper flex items-center justify-center p-4">
      <div className="text-center">
        <div className="inline-flex items-center justify-center w-16 h-16 rounded-full bg-primary-100 mb-4">
          <svg
            className="w-8 h-8 text-primary-600 animate-spin"
            fill="none"
            viewBox="0 0 24 24"
          >
            <circle
              className="opacity-25"
              cx="12"
              cy="12"
              r="10"
              stroke="currentColor"
              strokeWidth="4"
            />
            <path
              className="opacity-75"
              fill="currentColor"
              d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
            />
          </svg>
        </div>
        <h2 className="text-xl font-semibold text-slate-800 mb-2">
          Setting up your session...
        </h2>
        <p className="text-slate-600">Please wait while we prepare your garage.</p>
      </div>
    </div>
  );
};

export default CallbackPage;
