import { Suspense } from 'react';
import { redirect } from 'next/navigation';
import { getServerSession } from '@/lib/auth/getServerSession';
import { PERMISSIONS } from '@/lib/permissions/permissions';
import AccessDenied from '@/components/admin/errors/AccessDenied';
import UserForm from '@/components/admin/users/UserForm';
import { UserFormSkeleton } from '@/components/ui/FormSkeleton';
import { cookies } from 'next/headers';
import { SESSION_COOKIE } from '@/lib/auth/requireAuth';
import Link from 'next/link';

interface EditUserPageProps {
  params: Promise<{
    id: string;
  }>;
}

async function getUser(id: string, sessionToken: string) {
  try {
    const baseUrl = process.env.NEXT_PUBLIC_APP_URL || 'http://localhost:3000';
    const res = await fetch(`${baseUrl}/api/users/${id}`, {
      cache: 'no-store',
      headers: { Authorization: `Bearer ${sessionToken}` },
    });

    if (!res.ok) {
      return null;
    }

    const data = await res.json();
    return data.data;
  } catch (error) {
    console.error('Failed to fetch user:', error);
    return null;
  }
}

async function EditUserContent({ params }: EditUserPageProps) {
  const cookieStore = await cookies();
  const sessionId = cookieStore.get(SESSION_COOKIE)?.value;
  if (!sessionId) redirect('/admin/login');

  const session = await getServerSession();
  if (!session) redirect('/admin/login');
  if (!session.permissions.includes(PERMISSIONS.USERS_UPDATE)) return <AccessDenied />;

  const { id } = await params;
  const user = await getUser(id, sessionId);

  if (!user) {
    return (
      <div className="sm:p-6">
        <div className="text-center py-12">
          <h2 className="text-xl font-semibold mb-2" style={{ color: 'var(--color-text)' }}>
            User not found
          </h2>
          <p className="text-sm mb-6" style={{ color: 'var(--color-text-secondary)' }}>
            The user you&apos;re trying to edit doesn&apos;t exist or has been deleted.
          </p>
          <Link
            href="/admin/dashboard/users"
            className="inline-block px-4 py-2 rounded-lg text-sm font-medium transition-all hover:opacity-90"
            style={{ background: 'var(--color-cta)', color: 'white' }}
          >
            Back to Users
          </Link>
        </div>
      </div>
    );
  }

  return (
    <>
      <div className="mb-6">
        <h1 className="text-2xl font-semibold" style={{ color: 'var(--color-text)' }}>
          Edit User
        </h1>
        <p className="text-sm mt-1" style={{ color: 'var(--color-text-secondary)' }}>
          Update user information and settings
        </p>
      </div>

      <UserForm
        mode="edit"
        initialData={user}
      />
    </>
  );
}

export default async function EditUserPage({ params }: EditUserPageProps) {
  return (
    <div className="sm:p-6">
      <Suspense fallback={<UserFormSkeleton />}>
        <EditUserContent params={params} />
      </Suspense>
    </div>
  );
}