// Reine Funktionen des Analyse-Skripts (ohne DOM-Zugriff ausser an uebergebenen Objekten).
// Wird von w.js/h.js importiert; build.js fuegt alles zu je einer Datei ohne Import zusammen.

export const CONSENT_KEY = 'wk-consent';
export const CONSENT_MAX_AGE = 183 * 86400000;

export function vpClass(width) {
  const w = Number(width);
  if (w < 768) return 'm';
  if (w < 1024) return 't';
  return 'd';
}

export function cleanPath(href) {
  let p = '/';
  const h = String(href == null ? '' : href);
  if (h.charAt(0) === '/') {
    p = h.replace(/[?#].*$/, '') || '/'; // wie location.pathname, auch '//foo'
  } else {
    try { p = new URL(h, 'http://x.invalid/').pathname || '/'; } catch (e) { /* bleibt '/' */ }
  }
  try { p = decodeURIComponent(p); } catch (e) { /* kaputtes Encoding: roh lassen */ }
  if (p.charAt(0) !== '/') p = '/' + p;
  return p.slice(0, 300);
}

const stripWww = (h) => String(h).toLowerCase().replace(/^www\./, '');

export function refHost(referrer, ownHost) {
  if (!referrer) return '';
  try {
    const u = new URL(String(referrer));
    if (u.protocol !== 'http:' && u.protocol !== 'https:') return '';
    const h = u.hostname.toLowerCase();
    if (!h || stripWww(h) === stripWww(ownHost || '')) return '';
    return h;
  } catch (e) { return ''; }
}

// Nur Tag-Namen mit :nth-of-type, keine IDs/Klassen (koennten personenbezogene Texte enthalten).
export function cssPath(el) {
  const parts = [];
  let n = el;
  while (n && n.tagName && parts.length < 6) {
    const tag = String(n.tagName).toLowerCase().replace(/[^a-z0-9-]/g, '');
    if (!tag) break;
    let idx = 1;
    for (let s = n.previousElementSibling; s; s = s.previousElementSibling) {
      if (String(s.tagName).toLowerCase() === String(n.tagName).toLowerCase()) idx++;
    }
    parts.unshift(tag + ':nth-of-type(' + idx + ')');
    if (tag === 'body' || tag === 'html') break;
    n = n.parentNode;
  }
  let out = parts.join(' > ');
  while (out.length > 200 && parts.length > 1) { parts.shift(); out = parts.join(' > '); }
  return out.slice(0, 200);
}

function parseHref(a) {
  const href = a && (typeof a.href === 'string' && a.href ? a.href : (a.getAttribute && a.getAttribute('href'))) || '';
  return String(href).trim();
}

export function linkHost(a) {
  try { return new URL(parseHref(a)).hostname.toLowerCase(); } catch (e) { return ''; }
}

export function contactKind(a, ownHost) {
  const href = parseHref(a);
  if (!href) return null;
  const scheme = /^([a-z][a-z0-9+.-]*):/i.exec(href);
  if (!scheme) return null; // relativ, Anker
  const s = scheme[1].toLowerCase();
  if (s === 'tel') return 'tel';
  if (s === 'mailto') return 'mail';
  if (s === 'whatsapp') return 'wa';
  if (s !== 'http' && s !== 'https') return null;
  const host = linkHost(a);
  if (!host) return null;
  if (host === 'wa.me' || host === 'api.whatsapp.com') return 'wa';
  const own = ownHost == null ? (typeof location !== 'undefined' ? location.hostname : '') : ownHost;
  return stripWww(host) === stripWww(own || '') ? null : 'out';
}

export function readConsent(storage, now) {
  try {
    const raw = storage.getItem(CONSENT_KEY);
    if (!raw) return null;
    const c = JSON.parse(raw);
    if (!c || c.v !== 1 || (c.a !== 'accept' && c.a !== 'reject') || typeof c.t !== 'number' || !isFinite(c.t)) return null;
    const age = now - c.t;
    if (age < 0 || age >= CONSENT_MAX_AGE) return null;
    return { v: 1, a: c.a, t: c.t };
  } catch (e) { return null; }
}

export function contrastOk(hex) {
  if (typeof hex !== 'string' || !/^#[0-9a-f]{6}$/i.test(hex)) return false;
  const lin = (i) => {
    const c = parseInt(hex.slice(1 + i * 2, 3 + i * 2), 16) / 255;
    return c <= 0.03928 ? c / 12.92 : Math.pow((c + 0.055) / 1.055, 2.4);
  };
  const L = 0.2126 * lin(0) + 0.7152 * lin(1) + 0.0722 * lin(2);
  return 1.05 / (L + 0.05) >= 4.5;
}

export function escapeHtml(s) {
  return String(s == null ? '' : s).replace(/[&<>"']/g, (c) => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[c]));
}