document.addEventListener("DOMContentLoaded", () => {
    function setActiveMenu(id) {
        //Alle Sidebar-Links zurücksetzen
        document.querySelectorAll("#sidebar .nav-link").forEach(link => link.classList.remove("active"));
        // Alle Navbar-Links zurücksetzen
        document.querySelectorAll(".navbar-nav .nav-link").forEach(link => link.classList.remove("active"));
        
        //Aktiven Link setzen
        const activeLink = document.getElementById(id);
        if (activeLink) activeLink.classList.add("active");
    }
    window.loadPage = function loadPage(page, menuId) {
        fetch("pages/" + page + ".html")
            .then(response => {
                if (!response.ok) {
                    throw new Error("HTTP " + response.status);
                }
                return response.text();
            })
            .then(data => {
                document.getElementById("main-content").innerHTML = data;
                setActiveMenu(menuId);
                if (page === "login" && typeof window.initLoginPage === "function") {
                    window.initLoginPage();
                }
                if (page === "leaderboard" && typeof window.initLeaderboardPage === "function") {
                    window.initLeaderboardPage();
                }
            })
            .catch(error => {
                console.error("Fehler beim Laden von " + page + ":", error);
                document.getElementById("main-content").innerHTML = "<div class='alert alert-danger'>Fehler beim Laden der Seite: " + error.message + "</div>";
            });
    };

    const navHome = document.getElementById("nav-home");
    const navPlay = document.getElementById("nav-play");
    const navMyScores = document.getElementById("nav-my-scores");
    const navLeaderboard = document.getElementById("nav-leaderboard");
    const navbarLogin = document.getElementById("navbar-login");
    const navbarMessages = document.getElementById("navbar-messages");

    if (navHome) navHome.onclick = (e) => { e.preventDefault(); loadPage("home", "nav-home"); };
    if (navPlay) navPlay.onclick = (e) => { e.preventDefault(); loadPage("play", "nav-play"); };
    if (navMyScores) navMyScores.onclick = (e) => { e.preventDefault(); loadPage("scores", "nav-my-scores"); };
    if (navLeaderboard) navLeaderboard.onclick = (e) => { e.preventDefault(); loadPage("leaderboard", "nav-leaderboard"); };
    if (navbarLogin) navbarLogin.onclick = (e) => { e.preventDefault(); loadPage("login", "navbar-login"); };
    if (navbarMessages) navbarMessages.onclick = (e) => { e.preventDefault(); loadPage("messages", "navbar-messages"); };

    //Startseite laden
    loadPage("home", "nav-home");
});