/* =========================================================
   Unger Reisen — behaviour
   - render data-driven sections (stats / services / fleet)
   - scroll-driven bus across the hero
   - nav solidify on scroll
   - reveal-on-scroll (IntersectionObserver)
   - interactive MapLibre map (two locations + route)
   ========================================================= */
(function () {
  'use strict';

  var ACCENT = '#C8102E';
  var reduceMotion = window.matchMedia &&
    window.matchMedia('(prefers-reduced-motion:reduce)').matches;

  /* ---------- Data ---------- */
  var stats = [
    { big: '2',    label: 'Standorte in Bayern' },
    { big: '60+',  label: 'Sitzplätze pro Reisebus' },
    { big: '24/7', label: 'Für Sie erreichbar' },
    { big: '∞',    label: 'Ziele in ganz Europa' }
  ];

  var services = [
    { no: '01', title: 'Busanmietung', desc: 'Moderne Reisebusse mit Fahrer — flexibel für einzelne Fahrten oder mehrtägige Touren.' },
    { no: '02', title: 'Firmenreisen', desc: 'Betriebsausflüge, Tagungen und Events. Ihr Team sicher und entspannt am Ziel.' },
    { no: '03', title: 'Vereinsfahrten', desc: 'Ausflüge, Feste und Sportevents — komfortabel für die ganze Gruppe.' },
    { no: '04', title: 'Transfers', desc: 'Flughafen-, Hotel- und Event-Transfers. Pünktlich und rund um die Uhr planbar.' }
  ];

  var fleet = [
    { name: 'Reisebus', seats: '60', desc: 'Der Große für lange Strecken und große Gruppen — voll ausgestattet.', tags: ['Klimaanlage', 'WC', 'Bordküche', 'WLAN'] },
    { name: 'Midibus',  seats: '35', desc: 'Wendig und komfortabel — ideal für mittlere Gruppen und Tagestouren.', tags: ['Klimaanlage', 'Komfortbestuhlung'] },
    { name: 'Kleinbus', seats: '19', desc: 'Persönlich und flexibel für kleine Gruppen, Transfers und Sonderfahrten.', tags: ['Flexibel', 'Wendig'] }
  ];

  function el(tag, cls, html) {
    var n = document.createElement(tag);
    if (cls) n.className = cls;
    if (html != null) n.innerHTML = html;
    return n;
  }

  /* ---------- Render sections ---------- */
  function renderStats() {
    var grid = document.getElementById('stats-grid');
    if (!grid) return;
    stats.forEach(function (s) {
      var wrap = el('div', null);
      wrap.setAttribute('data-reveal', '');
      wrap.appendChild(el('div', 'display stat__big', s.big));
      wrap.appendChild(el('div', 'stat__label', s.label));
      grid.appendChild(wrap);
    });
  }

  function renderServices() {
    var grid = document.getElementById('services-grid');
    if (!grid) return;
    services.forEach(function (s) {
      var card = el('div', 'service');
      card.setAttribute('data-reveal', '');
      card.appendChild(el('div', 'display service__no', s.no));
      card.appendChild(el('h3', 'service__title', s.title));
      card.appendChild(el('p', 'service__desc', s.desc));
      grid.appendChild(card);
    });
  }

  function renderFleet() {
    var grid = document.getElementById('fleet-grid');
    if (!grid) return;
    fleet.forEach(function (f) {
      var card = el('div', 'fleetCard');
      card.setAttribute('data-reveal', '');

      var head = el('div', 'fleetCard__head');
      head.appendChild(el('h3', 'display fleetCard__name', f.name));
      var seats = el('div', 'fleetCard__seats',
        '<span class="fleetCard__seatsWord">bis</span>' +
        '<span class="display fleetCard__seatsNum">' + f.seats + '</span>' +
        '<span class="fleetCard__seatsWord">Sitze</span>');
      head.appendChild(seats);
      card.appendChild(head);

      var body = el('div', 'fleetCard__body');
      body.appendChild(el('p', 'fleetCard__desc', f.desc));
      var tags = el('div', 'fleetCard__tags');
      f.tags.forEach(function (t) { tags.appendChild(el('span', 'tag', t)); });
      body.appendChild(tags);
      card.appendChild(body);

      grid.appendChild(card);
    });
  }

  /* ---------- Nav solidify on scroll ---------- */
  function initNav() {
    var nav = document.getElementById('nav');
    if (!nav) return;
    var onScroll = function () {
      nav.classList.toggle('is-scrolled', window.scrollY > 40);
    };
    window.addEventListener('scroll', onScroll, { passive: true });
    onScroll();
  }

  /* ---------- Mobile menu ---------- */
  function initMobileMenu() {
    var burger = document.getElementById('nav-burger');
    var menu = document.getElementById('mobile-menu');
    if (!burger || !menu) return;

    function setOpen(open) {
      menu.classList.toggle('is-open', open);
      burger.classList.toggle('is-open', open);
      burger.setAttribute('aria-expanded', open ? 'true' : 'false');
      burger.setAttribute('aria-label', open ? 'Menü schließen' : 'Menü öffnen');
      document.body.style.overflow = open ? 'hidden' : '';
    }

    burger.addEventListener('click', function () {
      setOpen(!menu.classList.contains('is-open'));
    });
    menu.querySelectorAll('a').forEach(function (a) {
      a.addEventListener('click', function () { setOpen(false); });
    });
    window.addEventListener('keydown', function (e) {
      if (e.key === 'Escape') setOpen(false);
    });
    // Close if we grow past the mobile breakpoint.
    window.addEventListener('resize', function () {
      if (window.innerWidth > 680) setOpen(false);
    });
  }

  /* ---------- Scroll-driven bus ---------- */
  function initBus() {
    var bus = document.getElementById('bus');
    var hero = document.getElementById('top');
    if (!bus || !hero) return;

    function tick() {
      var hp = Math.min(1, Math.max(0, window.scrollY / (hero.offsetHeight * 0.9)));
      var scene = bus.parentNode;
      var sceneW = scene ? scene.offsetWidth : window.innerWidth;
      var busW = bus.offsetWidth || 400;
      var minX = -busW * 0.30;
      var maxX = sceneW - busW * 0.70;
      var x = minX + (maxX - minX) * hp;
      var bob = reduceMotion ? 0 : Math.sin(Date.now() / 380) * 4;
      bus.style.transform = 'translate(' + x.toFixed(1) + 'px,' + bob.toFixed(1) + 'px)';
      requestAnimationFrame(tick);
    }
    requestAnimationFrame(tick);
  }

  /* ---------- Reveal on scroll ---------- */
  function initReveal() {
    var els = Array.prototype.slice.call(document.querySelectorAll('[data-reveal]'));
    if ('IntersectionObserver' in window) {
      var io = new IntersectionObserver(function (entries) {
        entries.forEach(function (e) {
          if (e.isIntersecting) {
            e.target.classList.add('is-visible');
            io.unobserve(e.target);
          }
        });
      }, { threshold: 0.12 });
      els.forEach(function (n) { io.observe(n); });
    } else {
      els.forEach(function (n) { n.classList.add('is-visible'); });
    }
    // Safety fallback: reveal everything after 2.5s regardless.
    setTimeout(function () {
      els.forEach(function (n) { n.classList.add('is-visible'); });
    }, 2500);
  }

  /* ---------- Interactive map ---------- */
  function initMap() {
    var HOME = [12.0517, 48.4703];   // Buch am Erlbach / Vatersdorf
    var BRANCH = [12.1508, 48.5449]; // Landshut
    var container = document.getElementById('unger-map');
    if (!container || typeof maplibregl === 'undefined') return;

    function makePin(fill, ring, title, sub) {
      var wrap = el('div', 'pin');
      wrap.appendChild(el('div', 'pin__label',
        '<div class="pin__title">' + title + '</div>' +
        '<div class="pin__sub">' + sub + '</div>'));
      var dot = el('div', 'pin__dot');
      dot.style.background = fill;
      dot.style.border = '3px solid ' + ring;
      dot.style.boxShadow = '0 0 0 5px ' + ACCENT + '40, 0 2px 6px rgba(0,0,0,.55)';
      wrap.appendChild(dot);
      return wrap;
    }

    var map = new maplibregl.Map({
      container: container,
      style: 'https://basemaps.cartocdn.com/gl/dark-matter-gl-style/style.json',
      center: [(HOME[0] + BRANCH[0]) / 2, (HOME[1] + BRANCH[1]) / 2],
      zoom: 10.4,
      attributionControl: { compact: true }
    });
    map.scrollZoom.disable();
    map.addControl(new maplibregl.NavigationControl({ showCompass: true, visualizePitch: false }), 'top-right');

    // On phones, keep the map static so a one-finger drag scrolls the page
    // instead of getting trapped panning the map.
    if (window.matchMedia && window.matchMedia('(max-width:680px)').matches) {
      map.dragPan.disable();
      if (map.touchZoomRotate) map.touchZoomRotate.disable();
      if (map.touchPitch) map.touchPitch.disable();
    }

    new maplibregl.Marker({ element: makePin(ACCENT, '#fff', 'Landshut', 'Niederlassung'), anchor: 'bottom' })
      .setLngLat(BRANCH).addTo(map);
    new maplibregl.Marker({ element: makePin('#fff', ACCENT, 'Buch a. Erlbach', 'Hauptsitz'), anchor: 'bottom' })
      .setLngLat(HOME).addTo(map);

    map.on('load', function () {
      map.addSource('unger-route', {
        type: 'geojson',
        data: { type: 'Feature', properties: {}, geometry: { type: 'LineString', coordinates: [HOME, BRANCH] } }
      });
      map.addLayer({
        id: 'unger-route-casing', type: 'line', source: 'unger-route',
        layout: { 'line-join': 'round', 'line-cap': 'round' },
        paint: { 'line-color': ACCENT, 'line-width': 9, 'line-opacity': 0.18 }
      });
      map.addLayer({
        id: 'unger-route-line', type: 'line', source: 'unger-route',
        layout: { 'line-join': 'round', 'line-cap': 'round' },
        paint: { 'line-color': ACCENT, 'line-width': 3, 'line-dasharray': [1.6, 1.4] }
      });
      map.fitBounds([HOME, BRANCH], { padding: { top: 96, bottom: 70, left: 70, right: 70 }, duration: 0, maxZoom: 12 });
      setTimeout(function () { try { map.resize(); } catch (e) {} }, 60);
    });
  }

  /* ---------- Boot ---------- */
  function init() {
    renderStats();
    renderServices();
    renderFleet();
    initNav();
    initMobileMenu();
    initBus();
    initReveal();
    initMap();
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init);
  } else {
    init();
  }
})();