manifold/web/components/nav-bar.tsx

import clsx from 'clsx'
import Link from 'next/link'

import { useUser } from '../hooks/use-user'
import { Row } from './layout/row'
import { firebaseLogin, User } from '../lib/firebase/users'
import { ManifoldLogo } from './manifold-logo'
import { ProfileMenu } from './profile-menu'

export function NavBar(props: {
  darkBackground?: boolean
  wide?: boolean
  className?: string
}) {
  const { darkBackground, wide, className } = props

  const user = useUser()

  const hoverClasses =
    'hover:underline hover:decoration-indigo-400 hover:decoration-2'
  const themeClasses = clsx(darkBackground && 'text-white', hoverClasses)

  return (
    <nav className={clsx('w-full p-4 mb-4', className)} aria-label="Global">
      <Row
        className={clsx(
          'justify-between items-center mx-auto sm:px-4',
          wide ? 'max-w-6xl' : 'max-w-4xl'
        )}
      >
        <ManifoldLogo className="my-1" darkBackground={darkBackground} />

        <Row className="items-center gap-6 sm:gap-8 ml-6">
          {(user || user === null) && (
            <NavOptions user={user} themeClasses={themeClasses} />
          )}
        </Row>
      </Row>
    </nav>
  )
}

function NavOptions(props: { user: User | null; themeClasses: string }) {
  const { user, themeClasses } = props
  return (
    <>
      {user === null && (
        <Link href="/about">
          <a
            className={clsx(
              'text-base hidden md:block whitespace-nowrap',
              themeClasses
            )}
          >
            About
          </a>
        </Link>
      )}

      <Link href="/markets">
        <a
          className={clsx(
            'text-base hidden md:block whitespace-nowrap',
            themeClasses
          )}
        >
          All markets
        </a>
      </Link>

      {user === null ? (
        <>
          <div
            className={clsx(
              'text-base font-medium cursor-pointer whitespace-nowrap',
              themeClasses
            )}
            onClick={firebaseLogin}
          >
            Sign in
          </div>
        </>
      ) : (
        <>
          <Link href="/create">
            <a
              className={clsx(
                'text-base hidden md:block whitespace-nowrap',
                themeClasses
              )}
            >
              Create a market
            </a>
          </Link>

          <ProfileMenu user={user} />
        </>
      )}
    </>
  )
}