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 UsersTable from '@/components/admin/users/UsersTable';
import { UsersTableSkeleton } from '@/components/ui/CustomSkeleton';
import { cookies } from 'next/headers';
import { SESSION_COOKIE } from '@/lib/auth/requireAuth';
import { Metadata } from 'next';

export const metadata: Metadata = {
  title: 'Users',
};

async function getInitialUsers(sessionToken: string) {
  try {
    const baseUrl = process.env.NEXT_PUBLIC_APP_URL || 'http://localhost:3000';
    const res = await fetch(`${baseUrl}/api/users?page=1&limit=10`, {
      cache: 'no-store',
      headers: { Authorization: `Bearer ${sessionToken}` },
    });
    if (!res.ok) throw new Error('Failed to fetch users');
    const data = await res.json();
    return data.data;
  } catch (error) {
    console.error('Failed to fetch initial users:', error);
    return {
      users: [],
      pagination: { page: 1, limit: 10, total: 0, totalPages: 0 },
    };
  }
}

async function getInitialCounts(sessionToken: string) {
  try {
    const baseUrl = process.env.NEXT_PUBLIC_APP_URL || 'http://localhost:3000';
    const res = await fetch(`${baseUrl}/api/users/counts`, {
      cache: 'no-store',
      headers: { Authorization: `Bearer ${sessionToken}` },
    });
    if (!res.ok) throw new Error('Failed to fetch counts');
    const data = await res.json();
    return data.data as { active: number; deleted: number };
  } catch (error) {
    console.error('Failed to fetch user counts:', error);
    return { active: 0, deleted: 0 };
  }
}

async function UsersContent() {
  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_READ)) return <AccessDenied />;

  const canCreate = session.permissions.includes(PERMISSIONS.USERS_CREATE);
  const canEdit = session.permissions.includes(PERMISSIONS.USERS_UPDATE);
  const canDelete = session.permissions.includes(PERMISSIONS.USERS_DELETE);
  const canBulkDelete = session.permissions.includes(PERMISSIONS.USERS_BULK_DELETE);
  const canActivateDeactivate = session.permissions.includes(PERMISSIONS.USERS_ACTIVATE_DEACTIVATE);
  const canViewDeleted = session.permissions.includes(PERMISSIONS.USERS_VIEW_DELETED);
  const canPermanentDelete = session.permissions.includes(PERMISSIONS.USERS_PERMANENT_DELETE);
  const canRestore = session.permissions.includes(PERMISSIONS.USERS_RESTORE);
  const canBulkRestore = session.permissions.includes(PERMISSIONS.USERS_BULK_RESTORE);
  const canViewTimeline = session.permissions.includes(PERMISSIONS.USERS_VIEW_TIMELINE);

  const [initialData, initialCounts] = await Promise.all([
    getInitialUsers(sessionId),
    getInitialCounts(sessionId),
  ]);

  return (
    <>
      <div className="mb-6">
        <h1 className="text-2xl font-semibold" style={{ color: 'var(--color-text)' }}>
          Users
        </h1>
        <p className="text-sm mt-1" style={{ color: 'var(--color-text-secondary)' }}>
          Customers registered from the storefront
        </p>
      </div>

      <UsersTable
        canCreate={canCreate}
        canEdit={canEdit}
        canDelete={canDelete}
        canBulkDelete={canBulkDelete}
        canActivateDeactivate={canActivateDeactivate}
        canViewDeleted={canViewDeleted}
        canPermanentDelete={canPermanentDelete}
        canRestore={canRestore}
        canBulkRestore={canBulkRestore}
        canViewTimeline={canViewTimeline}
        initialUsers={initialData}
        initialCounts={initialCounts}
      />
    </>
  );
}

export default async function UsersPage() {
  return (
    <div className="sm:p-6">
      <Suspense fallback={<UsersTableSkeleton />}>
        <UsersContent />
      </Suspense>
    </div>
  );
}