import React, { FC, Fragment, useState } from 'react'
import { useHistory, useLocation } from 'react-router';
import { Menu, Transition } from '@headlessui/react'
import { ChartBarIcon, ClipboardListIcon } from '@heroicons/react/outline'

import { Dialog } from '../Dialog'
import { useDispatch, useSelector } from 'react-redux';
import { useCurrentUser } from '../../contexts';
import { RootState } from '../../services/store';
import { classNames } from '../../utils';
import { DashboardRoutePaths, QuestionRoutePaths, SessionRoutePaths } from '../../routes'
import { turnOff } from '../../services/store/unsavedChanges';
import { CurrentUserAvatar } from "../CurrentUserAvatar";
import { localFetch } from '../../utils/localFetch';
import { notEmpty } from '../../utils/notEmpty';
import { UserRole } from '../../__generated__/graphql-schema';

const UserMenu: FC = () => {
  const { user } = useCurrentUser();
  const history = useHistory();
  const [confirmLogout, setConfirmLogout] = useState(false)
  const unsavedChanges = useSelector((state: RootState) => state.unsavedChanges)
  const dispatch = useDispatch()

  const doLogout = () => {
    setConfirmLogout(false)

    dispatch(turnOff())

    localFetch('/users/sign_out', {
      method: 'DELETE'
    }).then(() => {
      window.location.href = '/'
    })
  }

  const handleLogout = () => {
    if (unsavedChanges && !confirmLogout) {
      setConfirmLogout(true)
    } else {
      doLogout()
    }
  }

  const [newPath, setNewPath] = useState<string>()

  const handleForcedRedirect = () => {
    if (!newPath) return

    dispatch(turnOff())
    setNewPath(undefined)
    history.push(newPath)
  }

  const handleLinkClick = (pathname: string) => {
    if (unsavedChanges) {
      setNewPath(pathname)
    } else {
      history.push(pathname)
    }
  }

  type MenuItem = {
    onClick: Function
    label: string
  }

  const menuItems: MenuItem[] = [
    (user?.roles.includes(UserRole.Admin) && {
      onClick: () => { window.location.href = '/admin'},
      label: 'Painel de Administração'
    }),
    {
      onClick: () => { handleLinkClick(SessionRoutePaths.show) },
      label: 'Perfil'
    },
    {
      onClick: handleLogout,
      label: 'Sair'
    }
  ].filter(notEmpty)

  return (
    <>
      <Dialog
        isOpen={!!newPath}
        setIsOpen={(value) => setNewPath(value ? newPath : undefined)}
        onConfirmation={handleForcedRedirect}
        title="Modificações não Salvas"
        text="Todas as alterações serão descartadas. Deseja continuar?"
      />
      <Dialog
        isOpen={confirmLogout}
        setIsOpen={setConfirmLogout}
        onConfirmation={handleLogout}
        title="Modificações não Salvas"
        text="Todas as alterações serão descartadas. Deseja continuar?"
      />
      <Menu as="div" className="relative h-full">
        {({ open }) => (
          <>
            <Menu.Button
              className="h-full flex flex-row px-2 items-center hover:bg-primary-dark text-gray-100 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-offset-gray-800 focus:ring-white"
            >
              <span className="hidden md:block pr-2">
                {user?.name}
              </span>
              <div className="w-12">
                <CurrentUserAvatar />
              </div>
            </Menu.Button>
            <Transition
              show={open}
              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
                static
                className="z-50 origin-top-right absolute right-0 mt-2 w-48 rounded-md shadow-lg py-1 bg-white ring-1 ring-black ring-opacity-5 focus:outline-none cursor-pointer"
              >
                {menuItems.map((item) => (
                  <Menu.Item key={`menu-item-${item.label}`} onClick={item.onClick}>
                    {({ active }) => (
                      <span
                        className={classNames(
                          active ? 'bg-gray-100' : '',
                          'block px-4 py-2 text-sm text-gray-900'
                        )}
                      >
                        {item.label}
                      </span>
                    )}
                  </Menu.Item>
                ))}
              </Menu.Items>
            </Transition>
          </>
        )}
      </Menu>
    </>
  )
}

const Links: FC = () => {
  const unsavedChanges = useSelector((state: RootState) => state.unsavedChanges)
  const dispatch = useDispatch()
  const location = useLocation()
  const history = useHistory()

  const [newPath, setNewPath] = useState<string>()

  const handleForcedRedirect = () => {
    if (!newPath) return

    dispatch(turnOff())
    setNewPath(undefined)
    history.push(newPath)
  }

  const handleLinkClick = (pathname: string) => {
    if (unsavedChanges) {
      setNewPath(pathname)
    } else {
      history.push(pathname)
    }
  }


  const links = [{
    icon: <ChartBarIcon className="w-6" />,
    tabel: 'Painel',
    pathname: DashboardRoutePaths.index,
    isCurrent: location.pathname.includes('dashboard'),
  },
  {
    icon: <ClipboardListIcon className="w-6" />,
    tabel: 'Edição',
    pathname: QuestionRoutePaths.index,
    isCurrent: location.pathname.includes('question'),
  }]

  return (
    <>
      <Dialog
        isOpen={!!newPath}
        setIsOpen={(value) => setNewPath(value ? newPath : undefined)}
        onConfirmation={handleForcedRedirect}
        title="Modificações não Salvas"
        text="Todas as alterações serão descartadas. Deseja continuar?"
      />
      <div className="h-full flex items-center pl-4">
        {links.map((link) => (
          <button
            className={`h-full flex items-center px-2 mx-2 text-gray-300 hover:bg-primary-dark ${link.isCurrent ? 'underline bg-primary-dark' : ''}`}
            key={`navbar-link-${link.pathname}`}
            onClick={() => handleLinkClick(link.pathname)}
          >
            <span className="pr-2 ">
              {link.icon}
            </span>
            {link.tabel}
          </button>
        ))}
      </div>
    </>
  )
}

const Logo: FC = () => (
  <div className="h-full grid place-items-center">
    <img
      alt="Símbolo do Unifeso"
      className="hidden md:block h-12 w-auto"
      src={'https://www.unifeso.edu.br/images/logo/UNIFESO-BRANCO.png'}
    />
    <img
      alt="Logotipo do Unifeso"
      className="md:hidden h-12 w-12 object-cover object-left"
      src={'https://www.unifeso.edu.br/images/logo/UNIFESO-BRANCO.png'}
    />
  </div>
)

export const Appbar = () => {
  return (
    <div className="px-4 bg-primary-normal flex items-center justify-between h-16 shadow-md">
      <div className="flex h-full">
        <Logo />
        <Links />
      </div>
      <UserMenu />
    </div>
  )
}