homepage/src/components/nav.js

import React from 'react'
import navStyles from './nav.module.css'
import { Link } from 'gatsby'

let pages = [
  ['home', '/', navStyles.desktopOnly],
  ['zeiten & location', '/treff', ''],
  ['events', '/events', ''],
  ['über uns', '/about', ''],
  ['kontakt', '/kontakt', ''],
  ['verein', '/verein', ''],
  ['supporte uns', '/support', ''],
]

export default ({ path }) => {
  // nav items should always be active in the staticly generated html
  const isSSR = typeof window === 'undefined'
  const activeClasses = link =>
    isSSR && path === link ? ' ' + navStyles.navItemActive : ''

  return (
    <>
      <header className={navStyles.header}>
        <Link to="/">
          <div className={navStyles.headerContent}>
            {/* todo: fix image links in prod by using the gatsby component */}
            <img alt="CTDO-Logo" width="80rem" src="/logo_ctdo.svg" />
            <span>
              <span className={navStyles.chaos}>Chaostreff</span> Dortmund
            </span>
          </div>
        </Link>
      </header>
      <nav className={navStyles.nav}>
        <div className={navStyles.navContent}>
          {pages.map(([title, link, device]) => (
            <Link
              key={title}
              className={navStyles.navItem + activeClasses(link) + ' ' + device}
              activeClassName={navStyles.navItemActive}
              to={`${link}`}
            >
              {title}
            </Link>
          ))}
        </div>
      </nav>
    </>
  )
}