FunctionProject/frontend/components/Header/Header.js

import { useState } from 'react';
import Link from 'next/link';
import NavigationLink from './NavigationLink';
import './Header.css';

export default function Header() {

    const [hamburgerIcon, setHamburgerIcon] = useState("");
    const [navbarList, setNavbarList] = useState("");

    const toggleNavbar = () => {
        if (hamburgerIcon) {
            setHamburgerIcon("");
            setNavbarList("");
        } else {
            setHamburgerIcon("Header__hamburger-active");
            setNavbarList("navbar__list-active");
        }
    }

    return (
        <header className="Header">
            <div className="container">

                {/* Brand */}
                <Link href={"/"}>
                    <a className="Header__brand-link">
                        <img id="brand-link__logo" src="/images/FunctionProject_brand-logo.png" alt="FunctionProject" />
                        <img id="brand-link__logo-small-screen" src="/images/FunctionProject_icon_small.png" alt="FunctionProject" />
                    </a>
                </Link>

                {/* Hamburger icon on Mobile */}
                <div onClick={toggleNavbar} className={"Header__hamburger " + hamburgerIcon}>
                    <span></span>
                </div>

                {/* Navigation */}
                <nav className="Header__navbar">
                    <ul className={"navbar__list " + navbarList}>
                        <NavigationLink name="Accueil" path="/" />
                        <NavigationLink name="Fonctions" path="/functions" />
                    </ul>
                </nav>

            </div>
        </header>
    );
}