(function () {
    "use strict";

    var TWITCH_CHANNEL = "duda_xd";

    /* Rendert die Video-IDs aus videos.js als iframes.
     * Standard-iframe laut YouTube-Empfehlung. Bewusst OHNE
     * referrerpolicy und OHNE ?si-Parameter: Dann sendet der Browser
     * immer einen Referer (auch bei HTTP-Seite), den YouTube braucht,
     * um den Embedder zu erkennen (sonst Fehler 152/153). */
    function renderYouTubeGrid(videoIds) {
        var grid = document.getElementById("yt-grid");
        if (!grid) return;
        if (!videoIds || !videoIds.length) {
            grid.innerHTML = '<div class="loading">Noch keine Videos vorhanden.</div>';
            return;
        }
        var html = "";
        for (var i = 0; i < videoIds.length; i++) {
            var id = String(videoIds[i]).trim();
            if (!id) continue;
            html +=
                '<div class="video-card">' +
                    '<div class="video-wrapper">' +
                        '<iframe width="560" height="315" ' +
                        'src="https://www.youtube.com/embed/' + id + '" ' +
                        'title="YouTube video player" ' +
                        'frameborder="0" ' +
                        'allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" ' +
                        'allowfullscreen></iframe>' +
                    '</div>' +
                '</div>';
        }
        grid.innerHTML = html || '<div class="loading">Keine Videos gefunden.</div>';
    }

    /* ------------------------------------------------------------------
     * YouTube: Liest die Video-IDs aus videos.js, die auf dem Server
     * von fetch_videos.py (einmal am Tag per Cron) mit den aktuellen
     * Video-IDs deines Kanals aktualisiert wird.
     *
     * Dein API-Key ist dabei NIE im Browser - er bleibt komplett auf
     * dem Server versteckt (siehe fetch_videos.py).
     * ------------------------------------------------------------------ */
    function loadYouTube() {
        var ids = (typeof DUDA17_VIDEOS !== "undefined") ? DUDA17_VIDEOS : [];
        renderYouTubeGrid(ids);
    }

    /* ------------------------------------------------------------------
     * Twitch: Live-Player einbetten.
     * ------------------------------------------------------------------ */
    function loadTwitch() {
        var wrap = document.getElementById("twitch-embed");
        if (!wrap) return;

        var domain = window.location.hostname || "localhost";
        var iframe = document.createElement("iframe");
        iframe.src = "https://player.twitch.tv/?channel=" + TWITCH_CHANNEL +
                     "&parent=" + domain + "&muted=true";
        iframe.setAttribute("title", "Twitch Stream");
        iframe.setAttribute("allowfullscreen", "true");
        iframe.setAttribute("scrolling", "no");
        iframe.setAttribute("allow", "autoplay; fullscreen");
        wrap.appendChild(iframe);
    }

    /* ------------------------------------------------------------------
     * Sticky Navigation & Back-to-Top
     * ------------------------------------------------------------------ */
    function initNavigation() {
        var nav = document.getElementById("sticky-nav");
        var backToTop = document.getElementById("back-to-top");
        var navLinks = document.querySelectorAll(".nav-link[data-section]");
        var sections = [];

        navLinks.forEach(function (link) {
            var id = link.getAttribute("data-section");
            var el = document.getElementById(id);
            if (el) sections.push({ id: id, el: el, link: link });
        });

        function onScroll() {
            var scrollY = window.scrollY || window.pageYOffset;

            if (scrollY > 300) {
                nav.classList.add("visible");
                backToTop.classList.add("visible");
            } else {
                nav.classList.remove("visible");
                backToTop.classList.remove("visible");
            }

            var active = null;
            for (var i = 0; i < sections.length; i++) {
                var rect = sections[i].el.getBoundingClientRect();
                if (rect.top <= 120) active = sections[i];
            }

            navLinks.forEach(function (l) { l.classList.remove("active"); });
            if (active) active.link.classList.add("active");
        }

        window.addEventListener("scroll", onScroll, { passive: true });
        onScroll();

        backToTop.addEventListener("click", function () {
            window.scrollTo({ top: 0, behavior: "smooth" });
        });

        navLinks.forEach(function (link) {
            link.addEventListener("click", function (e) {
                e.preventDefault();
                var id = this.getAttribute("data-section");
                var target = document.getElementById(id);
                if (target) {
                    target.scrollIntoView({ behavior: "smooth" });
                }
            });
        });

        var brandLink = document.querySelector(".nav-brand");
        if (brandLink) {
            brandLink.addEventListener("click", function (e) {
                e.preventDefault();
                window.scrollTo({ top: 0, behavior: "smooth" });
            });
        }
    }

    document.addEventListener("DOMContentLoaded", function () {
        loadYouTube();
        loadTwitch();
        initNavigation();
    });
})();