sprinklers3/client/components/NavBar.tsx

import { observer } from "mobx-react";
import * as React from "react";
import { Link } from "react-router-dom";
import { Menu } from "semantic-ui-react";

import * as route from "@client/routePaths";
import { AppState, ConsumeState, injectState } from "@client/state";

interface NavItemProps {
  to: string;
  children: React.ReactNode;
}

const NavItem = observer(({ to, children }: NavItemProps) => {
  function consumeState(appState: AppState) {
    const { location } = appState.routerStore;
    return (
      <Menu.Item as={Link} to={to} active={location.pathname.startsWith(to)}>
        {children}
      </Menu.Item>
    );
  }

  return <ConsumeState>{consumeState}</ConsumeState>;
});

function NavBar({ appState }: { appState: AppState }) {
  let loginMenu;
  // tslint:disable-next-line:prefer-conditional-expression
  if (appState.isLoggedIn) {
    loginMenu = <NavItem to={route.logout}>Logout</NavItem>;
  } else {
    loginMenu = <NavItem to={route.login}>Login</NavItem>;
  }
  return (
    <Menu>
      <NavItem to={route.device()}>Devices</NavItem>
      <NavItem to={route.messagesTest}>Messages test</NavItem>
      <Menu.Menu position="right">{loginMenu}</Menu.Menu>
    </Menu>
  );
}

export default observer(injectState(NavBar));