// WEBklar Analyse: Einwilligungs-Banner + Ereignisse. Laeuft auf oeffentlichen Kunden-Websites.
// Keine Cookies, keine Kennung im Browser. Nur pv ohne Einwilligung; ck/ct/en nur nach Annehmen.
import { cleanPath, vpClass, refHost, cssPath, contactKind, linkHost, readConsent, contrastOk, CONSENT_KEY } from './core.js';

function main() {
  const DOC = document;
  const WIN = window;
  if (WIN.__wkAnalytics) return; // doppelt eingebunden
  WIN.__wkAnalytics = true;
  const SELF = DOC.currentScript && DOC.currentScript.getAttribute && DOC.currentScript.getAttribute('data-site')
    ? DOC.currentScript : DOC.querySelector('script[src*="/a/w.js"]');
  if (!SELF) return;
  const site = String(SELF.getAttribute('data-site') || '');
  if (!/^[a-z0-9]{16,40}$/.test(site)) return;
  const colorAttr = String(SELF.getAttribute('data-color') || '');
  const accent = contrastOk(colorAttr) ? colorAttr : '#111111';
  const src = String(SELF.src || SELF.getAttribute('src') || '').replace(/[?#].*$/, '');
  const base = src.replace(/[^/]*$/, '');
  const endpoint = base + 'e';

  // ---- Heatmap-Modus: nichts senden, kein Banner ----
  const qs = new URLSearchParams(WIN.location.search);
  const heatToken = qs.get('__wk_heat');
  if (heatToken) {
    qs.delete('__wk_heat');
    const rest = qs.toString();
    try { WIN.history.replaceState(null, '', WIN.location.pathname + (rest ? '?' + rest : '') + (WIN.location.hash || '')); } catch (e) { /* egal */ }
    const s = DOC.createElement('script');
    s.setAttribute('src', base + 'h.js');
    s.setAttribute('data-token', heatToken);
    (DOC.head || DOC.documentElement).appendChild(s);
    return;
  }

  // ---- Senden: Fehler werden verschluckt ----
  function send(obj) {
    try {
      const body = JSON.stringify(obj);
      if (navigator.sendBeacon && navigator.sendBeacon(endpoint, body)) return;
      fetch(endpoint, { method: 'POST', body, keepalive: true, credentials: 'omit', headers: { 'Content-Type': 'text/plain' } }).catch(function () {});
    } catch (e) { /* egal */ }
  }
  const safe = (fn) => function () { try { return fn.apply(this, arguments); } catch (e) { /* nie die Seite stoeren */ } };
  const vp = () => vpClass(WIN.innerWidth);
  const ownHost = () => WIN.location.hostname;

  // ---- Seitenaufruf (pv): immer, auch ohne Einwilligung ----
  let lastPath = null;
  let pvStart = Date.now();
  let maxScroll = 0;
  let enSent = false;
  function sendPv(first) {
    lastPath = cleanPath(WIN.location.pathname);
    pvStart = Date.now(); maxScroll = 0; enSent = false;
    send({ t: 'pv', site, path: lastPath, ref: first ? refHost(DOC.referrer, ownHost()) : '', vp: vp() });
  }
  let navTimer = null;
  function scheduleNav() {
    if (navTimer) return;
    navTimer = setTimeout(safe(function () {
      navTimer = null;
      if (cleanPath(WIN.location.pathname) !== lastPath) sendPv(false);
    }), 300);
  }
  sendPv(true);
  WIN.addEventListener('pageshow', safe(function (e) { if (e && e.persisted) sendPv(false); }));
  try {
    const orig = WIN.history.pushState;
    WIN.history.pushState = function () { const r = orig.apply(this, arguments); try { scheduleNav(); } catch (e) { /* egal */ } return r; };
    WIN.addEventListener('popstate', safe(scheduleNav));
  } catch (e) { /* egal */ }

  // ---- Tracking (nur nach Annehmen erreichbar) ----
  let storage = null;
  try { storage = WIN.localStorage; } catch (e) { /* gesperrt */ }
  let memChoice = null;
  let tracking = false;
  const hosts = [];
  const scrollPct = () => {
    const h = DOC.documentElement.scrollHeight || 1;
    return Math.max(0, Math.min(100, Math.round(((WIN.scrollY || 0) + WIN.innerHeight) / h * 100)));
  };
  const rel = (v, total) => Math.max(0, Math.min(1, Math.round(v / (total || 1) * 10000) / 10000));

  const onClick = safe(function (e) {
    if (!allowed()) return;
    const t = e.target;
    if (!t || hosts.indexOf(t) !== -1) return;
    const dw = DOC.documentElement.scrollWidth, dh = DOC.documentElement.scrollHeight;
    const px = typeof e.pageX === 'number' ? e.pageX : (e.clientX || 0) + (WIN.scrollX || 0);
    const py = typeof e.pageY === 'number' ? e.pageY : (e.clientY || 0) + (WIN.scrollY || 0);
    const path = cleanPath(WIN.location.pathname);
    send({ t: 'ck', site, path, vp: vp(), x: rel(px, dw), y: rel(py, dh), sel: cssPath(t) });
    let a = t;
    while (a && String(a.tagName).toUpperCase() !== 'A') a = a.parentNode;
    const kind = a ? contactKind(a, ownHost()) : null;
    if (kind) {
      const ev = { t: 'ct', site, path, kind };
      if (kind === 'out') ev.host = linkHost(a);
      send(ev);
    }
  });
  const onScroll = safe(function () { maxScroll = Math.max(maxScroll, scrollPct()); });
  function sendEn() {
    if (enSent || !allowed()) return;
    enSent = true;
    send({ t: 'en', site, path: lastPath || cleanPath(WIN.location.pathname), vp: vp(),
      sec: Math.max(0, Math.min(3600, Math.round((Date.now() - pvStart) / 1000))), scroll: Math.max(maxScroll, scrollPct()) });
  }
  const onLeave = safe(sendEn);
  // Interner Seitenwechsel per Link: en sofort senden, der Beacon beim pagehide geht in Chromium oft verloren.
  // Bubbling-Listener am Dokument: laeuft nach den Handlern der Seite, defaultPrevented ist dann bekannt.
  const onLinkClick = safe(function (e) {
    if (e.defaultPrevented || e.ctrlKey || e.metaKey || e.shiftKey || e.altKey || (typeof e.button === 'number' && e.button !== 0)) return;
    let a = e.target;
    while (a && String(a.tagName).toUpperCase() !== 'A') a = a.parentNode;
    if (!a || hosts.indexOf(e.target) !== -1) return;
    const tg = String(a.getAttribute('target') || '').toLowerCase();
    if ((tg && tg !== '_self') || a.getAttribute('download') !== null) return;
    const u = new URL(String(a.href || a.getAttribute('href') || ''), WIN.location.href);
    if (u.protocol !== 'http:' && u.protocol !== 'https:') return;
    if (u.origin !== WIN.location.origin || u.pathname === WIN.location.pathname) return;
    sendEn();
  });
  const onVis = safe(function () { if (DOC.visibilityState === 'hidden') onLeave(); });

  // Einwilligung unmittelbar vor jedem Senden pruefen (z.B. in einem anderen Tab widerrufen)
  function allowed() {
    const c = readConsent(storage, Date.now());
    const ok = c ? c.a === 'accept' : !!(memChoice && memChoice.a === 'accept');
    if (!ok && tracking) stopTracking();
    return ok;
  }

  function startTracking() {
    if (tracking) return;
    tracking = true;
    DOC.addEventListener('click', onClick, { capture: true, passive: true });
    DOC.addEventListener('click', onLinkClick, { passive: true });
    DOC.addEventListener('visibilitychange', onVis);
    WIN.addEventListener('pagehide', onLeave);
    WIN.addEventListener('scroll', onScroll, { passive: true });
  }
  function stopTracking() {
    tracking = false;
    DOC.removeEventListener('click', onClick, { capture: true });
    DOC.removeEventListener('click', onLinkClick);
    DOC.removeEventListener('visibilitychange', onVis);
    WIN.removeEventListener('pagehide', onLeave);
    WIN.removeEventListener('scroll', onScroll);
  }

  // ---- Einwilligung ----
  const dnt = (v) => v === '1' || v === 'yes';
  const gpc = navigator.globalPrivacyControl === true || dnt(navigator.doNotTrack) || dnt(WIN.doNotTrack) || dnt(navigator.msDoNotTrack);
  if (gpc) return; // wie Ablehnen: kein Banner, kein bn, nie Tracking

  const stored = readConsent(storage, Date.now());
  let bannerHost = null;
  let linkHostEl = null;

  function choose(a) {
    memChoice = null;
    try { storage.setItem(CONSENT_KEY, JSON.stringify({ v: 1, a, t: Date.now() })); } catch (e) { memChoice = { a }; /* ohne Speicher: gilt nur fuer diese Seite */ }
    send({ t: 'bn', site, a });
    if (a === 'accept') startTracking(); else stopTracking();
    closeBanner();
  }

  function el(tag, attrs, text) {
    const n = DOC.createElement(tag);
    for (const k in attrs || {}) n.setAttribute(k, attrs[k]);
    if (text != null) n.textContent = text;
    return n;
  }

  const CSS = ':host{all:initial}' +
    '*{box-sizing:border-box}' +
    '.bar{display:flex;align-items:center;justify-content:center;gap:16px;padding:14px 20px;background:#fff;color:#111;border-top:1px solid #d0d0d0;box-shadow:0 -2px 12px rgba(0,0,0,.12);font:15px/1.45 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}' +
    '.t{margin:0;max-width:720px}' +
    '.t a{color:#111;text-decoration:underline}' +
    '.r{display:flex;gap:10px;flex:none}' +
    'button{font:600 15px/1 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;width:150px;height:44px;padding:0 20px;border:2px solid ' + accent + ';border-radius:8px;cursor:pointer;background:' + accent + ';color:#fff}' +
    'button:focus-visible{outline:3px solid #1a73e8;outline-offset:2px}' +
    '@media (max-width:767px){.bar{display:block;margin:8px;padding:16px;border:1px solid #d0d0d0;border-radius:12px}.r{flex-direction:column;margin-top:12px}button{width:100%}}';

  function openBanner(focus) {
    if (bannerHost) return;
    const prev = DOC.activeElement;
    bannerHost = DOC.createElement('div');
    const st = bannerHost.style;
    st.position = 'fixed'; st.left = '0'; st.right = '0'; st.bottom = '0'; st.zIndex = '2147483647';
    hosts.push(bannerHost);
    const root = bannerHost.attachShadow({ mode: 'open' });
    root.appendChild(el('style', {}, CSS));
    const bar = el('div', { class: 'bar', role: 'dialog', 'aria-label': 'Cookie-Einstellungen' });
    const p = el('p', { class: 't' }, 'Wir möchten mit deiner Zustimmung anonym auswerten, wie unsere Website genutzt wird (keine Cookies, keine Weitergabe). Details: ');
    p.appendChild(el('a', { href: '/datenschutz-analyse.html' }, 'Datenschutz'));
    const row = el('div', { class: 'r' });
    const no = el('button', { type: 'button' }, 'Ablehnen');
    const yes = el('button', { type: 'button' }, 'Annehmen');
    no.addEventListener('click', safe(function () { choose('reject'); if (prev && prev.focus) prev.focus(); }));
    yes.addEventListener('click', safe(function () { choose('accept'); if (prev && prev.focus) prev.focus(); }));
    row.appendChild(no); row.appendChild(yes);
    bar.appendChild(p); bar.appendChild(row);
    root.appendChild(bar);
    DOC.body.appendChild(bannerHost);
    if (linkHostEl) linkHostEl.style.display = 'none';
    if (focus === true) no.focus();
  }
  function closeBanner() {
    if (!bannerHost) return;
    const i = hosts.indexOf(bannerHost);
    if (i !== -1) hosts.splice(i, 1);
    bannerHost.remove();
    bannerHost = null;
    if (linkHostEl) linkHostEl.style.display = '';
  }

  function addSettingsLink() {
    linkHostEl = DOC.createElement('div');
    const st = linkHostEl.style;
    st.position = 'fixed'; st.right = '12px'; st.bottom = '12px'; st.zIndex = '2147483646';
    hosts.push(linkHostEl);
    const root = linkHostEl.attachShadow({ mode: 'open' });
    root.appendChild(el('style', {}, ':host{all:initial}button{font:12px/1 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;padding:6px 10px;border:1px solid #bbb;border-radius:6px;background:#fff;color:#444;cursor:pointer}button:focus-visible{outline:3px solid #1a73e8}'));
    const b = el('button', { type: 'button' }, 'Cookie-Einstellungen');
    b.addEventListener('click', safe(function () { openBanner(true); }));
    root.appendChild(b);
    DOC.body.appendChild(linkHostEl);
  }

  DOC.addEventListener('click', safe(function (e) {
    const t = e.target;
    if (t && t.closest && t.closest('[data-webklar-consent]')) { if (e.preventDefault) e.preventDefault(); openBanner(true); }
  }));
  if (!DOC.querySelector('[data-webklar-consent]')) addSettingsLink();

  // Einwilligung in anderem Tab geaendert
  WIN.addEventListener('storage', safe(function (e) {
    if (e.key !== null && e.key !== CONSENT_KEY) return;
    const c = readConsent(storage, Date.now());
    if (c && c.a === 'accept') startTracking(); else stopTracking();
    if (c) closeBanner();
  }));

  if (stored) {
    if (stored.a === 'accept') startTracking();
  } else {
    openBanner();
    send({ t: 'bn', site, a: 'shown' });
  }
}

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