// WEBklar Analyse: Heatmap-Overlay (wird von w.js nur mit gueltigem ?__wk_heat=Token geladen).
// data-embed="1" (nur in einem Rahmen): Ansicht im Geraeterahmen des Kundenportals. Dann ohne Leiste,
// Links und Formulare gesperrt, und die Klickzahl geht per postMessage nur an das Portal (Herkunft von h.js).

function main() {
  const me = document.currentScript;
  const token = me && me.getAttribute('data-token');
  const src = String((me && (me.src || me.getAttribute('src'))) || '').replace(/[?#].*$/, '');
  const base = src.replace(/[^/]*$/, '');
  if (!token || !base) return;

  const de = document.documentElement;
  let portal = '';
  try { portal = new URL(base).origin; } catch (e) { /* ohne Portal keine Einbettung */ }
  const embed = !!portal && me.getAttribute('data-embed') === '1' && window.parent && window.parent !== window;
  function tell(state, count) {
    if (!embed) return;
    try { window.parent.postMessage({ wk: 'heat', state: state, count: count }, portal); } catch (e) { /* egal */ }
  }

  const canvas = document.createElement('canvas');
  const cs = canvas.style;
  cs.position = 'absolute'; cs.left = '0'; cs.top = '0'; cs.pointerEvents = 'none'; cs.zIndex = '2147483646';
  document.body.appendChild(canvas);

  let points = [];
  let lastW = 0, lastH = 0, timer = 0;

  // Farbverlauf: transparent -> blau -> gruen -> gelb -> rot
  const ramp = (function () {
    const c = document.createElement('canvas'); c.width = 256; c.height = 1;
    const g = c.getContext('2d');
    const lg = g.createLinearGradient(0, 0, 256, 0);
    lg.addColorStop(0.25, 'rgb(0,0,255)'); lg.addColorStop(0.55, 'rgb(0,255,0)'); lg.addColorStop(0.85, 'rgb(255,255,0)'); lg.addColorStop(1, 'rgb(255,0,0)');
    g.fillStyle = lg; g.fillRect(0, 0, 256, 1);
    return g.getImageData(0, 0, 256, 1).data;
  })();

  if (embed) {
    // Nur ansehen: kein Seitenwechsel (er wuerde zaehlen und das Banner zeigen)
    const block = function (e) {
      const t = e.target;
      if (e.type === 'submit' || (t && t.closest && t.closest('a,area'))) { e.preventDefault(); e.stopPropagation(); }
    };
    window.addEventListener('click', block, true);
    window.addEventListener('submit', block, true);
    // Handy und Tablet haben ueberlagernde Scrollleisten; so stimmt die Breite wie auf dem Geraet
    const st = document.createElement('style');
    st.textContent = 'html{scrollbar-width:none}html::-webkit-scrollbar{display:none}';
    (document.head || de).appendChild(st);
    start(function (n) { tell('ready', n); }, function () { tell('error', 0); });
    return;
  }

  const host = document.createElement('div');
  host.style.position = 'fixed'; host.style.left = '0'; host.style.right = '0'; host.style.top = '0'; host.style.zIndex = '2147483647';
  const root = host.attachShadow({ mode: 'open' });
  const style = document.createElement('style');
  style.textContent = ':host{all:initial}.bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 16px;background:#111;color:#fff;font:14px/1.4 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}button{font:600 14px/1 system-ui,sans-serif;padding:8px 14px;border:2px solid #fff;border-radius:6px;background:#fff;color:#111;cursor:pointer}button:focus-visible{outline:3px solid #1a73e8;outline-offset:2px}';
  const bar = document.createElement('div');
  bar.className = 'bar';
  const msg = document.createElement('span');
  msg.textContent = 'Heatmap wird geladen ...';
  const close = document.createElement('button');
  close.setAttribute('type', 'button');
  close.textContent = 'Schließen';
  bar.appendChild(msg); bar.appendChild(close);
  root.appendChild(style); root.appendChild(bar);
  document.body.appendChild(host);

  function draw() {
    const w = Math.max(de.scrollWidth, de.clientWidth, 1);
    const h = Math.max(de.scrollHeight, de.clientHeight, 1);
    lastW = w; lastH = h;
    // Zeichenflaeche begrenzen (Speicher): hoechstens ca. 4 Mio. Pixel
    const scale = Math.min(1, Math.sqrt(4e6 / (w * h)));
    const cw = Math.max(1, Math.floor(w * scale)), ch = Math.max(1, Math.floor(h * scale));
    canvas.width = cw; canvas.height = ch;
    cs.width = w + 'px'; cs.height = h + 'px';
    const g = canvas.getContext('2d');
    g.clearRect(0, 0, cw, ch);
    const r = Math.max(6, 30 * scale);
    for (const p of points) {
      const x = p.x * cw, y = p.y * ch;
      const rg = g.createRadialGradient(x, y, 0, x, y, r);
      rg.addColorStop(0, 'rgba(0,0,0,0.25)'); rg.addColorStop(1, 'rgba(0,0,0,0)');
      g.fillStyle = rg; g.fillRect(x - r, y - r, r * 2, r * 2);
    }
    // Deckkraft-Stufen in Farben umsetzen
    const img = g.getImageData(0, 0, cw, ch);
    const d = img.data;
    for (let i = 3; i < d.length; i += 4) {
      const a = d[i];
      if (!a) continue;
      const k = Math.min(255, a * 3) * 4;
      d[i - 3] = ramp[k]; d[i - 2] = ramp[k + 1]; d[i - 1] = ramp[k + 2];
      d[i] = Math.min(200, 60 + a);
    }
    g.putImageData(img, 0, 0);
  }

  function redrawIfChanged() {
    if (Math.max(de.scrollWidth, de.clientWidth) !== lastW || Math.max(de.scrollHeight, de.clientHeight) !== lastH) draw();
  }
  function stop() {
    clearInterval(timer);
    window.removeEventListener('resize', draw);
    host.remove(); canvas.remove();
  }
  close.addEventListener('click', stop);
  start(function (n) { msg.textContent = 'Heatmap – ' + n + ' Klicks (letzte 30 Tage)'; },
    function () { msg.textContent = 'Heatmap-Link abgelaufen oder ungültig'; });

  // Punkte laden, zeichnen und bei Groessenaenderung neu zeichnen
  function start(onReady, onError) {
    window.addEventListener('resize', draw);
    fetch(base + 'heat?token=' + encodeURIComponent(token), { credentials: 'omit' })
      .then(function (r) { if (!r.ok) throw new Error('heat'); return r.json(); })
      .then(function (j) {
        points = (j && Array.isArray(j.points) ? j.points : []).filter(function (p) { return p && p.x >= 0 && p.x <= 1 && p.y >= 0 && p.y <= 1; });
        draw();
        timer = setInterval(redrawIfChanged, 1000);
        onReady(points.length);
      })
      .catch(function () { onError(); });
  }
}

try { main(); } catch (e) { /* nie die Seite stoeren */ }