import { Fragment } from 'react';
import { Link, useNavigate } from 'react-router-dom';
import { Disclosure, Menu, Transition } from '@headlessui/react';
import { Bars3Icon, XMarkIcon } from '@heroicons/react/24/outline';
import { useAuth } from '../../contexts/AuthContext';

function classNames(...classes) {
  return classes.filter(Boolean).join(' ');
}

export default function Navbar() {
  const { currentUser, logout, hasRole } = useAuth();
  const navigate = useNavigate();

  const handleLogout = () => {
    logout();
    navigate('/login');
  };

  // Define navigation items based on user role
  const getNavigationItems = () => {
    const items = [
      { name: 'Dashboard', href: '/dashboard', current: false },
      { name: 'Products', href: '/products', current: false }
    ];

    // Add Companies link for superadmin
    if (hasRole('superadmin')) {
      items.push({ name: 'Companies', href: '/companies', current: false });
    }

    // Add Users link for superadmin and companyadmin
    if (hasRole(['superadmin', 'companyadmin'])) {
      items.push({ name: 'Users', href: '/users', current: false });
    }

    return items;
  };

  return (
    <Disclosure as="nav" className="bg-gray-800">
      {({ open }) => (
        <>
          <div className="mx-auto max-w-7xl px-2 sm:px-6 lg:px-8">
            <div className="relative flex h-16 items-center justify-between">
              <div className="absolute inset-y-0 left-0 flex items-center sm:hidden">
                {/* Mobile menu button*/}
                <Disclosure.Button className="relative inline-flex items-center justify-center rounded-md p-2 text-gray-400 hover:bg-gray-700 hover:text-white focus:outline-none focus:ring-2 focus:ring-inset focus:ring-white">
                  <span className="absolute -inset-0.5" />
                  <span className="sr-only">Open main menu</span>
                  {open ? (
                    <XMarkIcon className="block h-6 w-6" aria-hidden="true" />
                  ) : (
                    <Bars3Icon className="block h-6 w-6" aria-hidden="true" />
                  )}
                </Disclosure.Button>
              </div>
              <div className="flex flex-1 items-center justify-center sm:items-stretch sm:justify-start">
                <div className="flex flex-shrink-0 items-center">
                  <Link to="/" className="text-white font-bold text-xl">InInventer</Link>
                </div>
                <div className="hidden sm:ml-6 sm:block">
                  <div className="flex space-x-4">
                    {currentUser && getNavigationItems().map((item) => (
                      <Link
                        key={item.name}
                        to={item.href}
                        className={classNames(
                          item.current
                            ? 'bg-gray-900 text-white'
                            : 'text-gray-300 hover:bg-gray-700 hover:text-white',
                          'rounded-md px-3 py-2 text-sm font-medium'
                        )}
                        aria-current={item.current ? 'page' : undefined}
                      >
                        {item.name}
                      </Link>
                    ))}
                  </div>
                </div>
              </div>
              <div className="absolute inset-y-0 right-0 flex items-center pr-2 sm:static sm:inset-auto sm:ml-6 sm:pr-0">
                {currentUser ? (
                  <Menu as="div" className="relative ml-3">
                    <div>
                      <Menu.Button className="relative flex rounded-full bg-gray-800 text-sm focus:outline-none focus:ring-2 focus:ring-white focus:ring-offset-2 focus:ring-offset-gray-800">
                        <span className="absolute -inset-1.5" />
                        <span className="sr-only">Open user menu</span>
                        <div className="h-8 w-8 rounded-full bg-gray-500 flex items-center justify-center text-white">
                          {currentUser.email.charAt(0).toUpperCase()}
                        </div>
                      </Menu.Button>
                    </div>
                    <Transition
                      as={Fragment}
                      enter="transition ease-out duration-100"
                      enterFrom="transform opacity-0 scale-95"
                      enterTo="transform opacity-100 scale-100"
                      leave="transition ease-in duration-75"
                      leaveFrom="transform opacity-100 scale-100"
                      leaveTo="transform opacity-0 scale-95"
                    >
                      <Menu.Items className="absolute right-0 z-10 mt-2 w-48 origin-top-right rounded-md bg-white py-1 shadow-lg ring-1 ring-black ring-opacity-5 focus:outline-none">
                        <Menu.Item>
                          {({ active }) => (
                            <div className="px-4 py-2 text-sm text-gray-700">
                              <div>{currentUser.email}</div>
                              <div className="text-xs text-gray-500 mt-1">
                                Role: {currentUser.role}
                              </div>
                            </div>
                          )}
                        </Menu.Item>
                        <Menu.Item>
                          {({ active }) => (
                            <button
                              onClick={handleLogout}
                              className={classNames(
                                active ? 'bg-gray-100' : '',
                                'block w-full text-left px-4 py-2 text-sm text-gray-700'
                              )}
                            >
                              Sign out
                            </button>
                          )}
                        </Menu.Item>
                      </Menu.Items>
                    </Transition>
                  </Menu>
                ) : (
                  <Link
                    to="/login"
                    className="text-gray-300 hover:bg-gray-700 hover:text-white rounded-md px-3 py-2 text-sm font-medium"
                  >
                    Login
                  </Link>
                )}
              </div>
            </div>
          </div>

          <Disclosure.Panel className="sm:hidden">
            <div className="space-y-1 px-2 pb-3 pt-2">
              {currentUser && getNavigationItems().map((item) => (
                <Link
                  key={item.name}
                  to={item.href}
                  className={classNames(
                    item.current
                      ? 'bg-gray-900 text-white'
                      : 'text-gray-300 hover:bg-gray-700 hover:text-white',
                    'block rounded-md px-3 py-2 text-base font-medium'
                  )}
                  aria-current={item.current ? 'page' : undefined}
                >
                  {item.name}
                </Link>
              ))}
            </div>
          </Disclosure.Panel>
        </>
      )}
    </Disclosure>
  );
}