/**
 * Modulares Impressum — Single Source of Truth für alle Onepager-Sites.
 *
 * Einbinden:
 *   <script src="/shared/impressum.js"></script>
 *   <script src="/shared/impressum.js" data-owner="flexsiebels"></script>
 *   <script src="/shared/impressum.js" data-owner="flexsiebels" data-variant="full"></script>
 *
 * Konfiguration via data-Attribute am Script-Tag:
 *   data-owner="msbls"          (default) — Kurzverweis auf msbls.de
 *   data-owner="flexsiebels"    — Kurzverweis auf flexsiebels.de
 *   data-owner="martinsiebels"  — volles Impressum Martin Siebels (separate Person, Osnabrück)
 *   data-variant="minimal"      (default) — Einzeiler im Footer (inline)
 *   data-variant="full"         — kleiner Trigger im Footer, voller § 5 TMG-Block im Overlay
 *
 *   Legacy-Alias: data-style (gleiche Werte wie data-variant).
 *
 * Render-Ziel: Element mit id="impressum" falls vorhanden, sonst <footer>, sonst body.
 */
(function () {
  const script = document.currentScript;
  const owner = script?.getAttribute('data-owner') || 'msbls';
  const variant = script?.getAttribute('data-variant')
    || script?.getAttribute('data-style')
    || 'minimal';

  // Gemeinsamer Block für Matthias Siebels (m) — beide Domains, gleiche Anschrift.
  const matthiasAddress = 'Matthias Siebels<br>'
    + 'c/o Online-Impressum.de #5892<br>'
    + 'Europaring 90<br>'
    + '53757 Sankt Augustin';

  const owners = {
    msbls: {
      minimal: 'Ein Projekt von <a href="https://msbls.de" target="_blank" rel="noopener">msbls.de</a>',
      full: '<strong>Angaben gemäß § 5 TMG:</strong><br>'
        + matthiasAddress + '<br>'
        + 'E-Mail: <a href="mailto:mail@msbls.de">mail@msbls.de</a>',
    },
    flexsiebels: {
      minimal: 'Ein Projekt von <a href="https://flexsiebels.de" target="_blank" rel="noopener">flexsiebels.de</a>',
      full: '<strong>Angaben gemäß § 5 TMG:</strong><br>'
        + matthiasAddress + '<br>'
        + 'E-Mail: <a href="mailto:mail@flexsiebels.de">mail@flexsiebels.de</a>',
    },
    martinsiebels: {
      minimal: 'Ein Projekt von <a href="https://martinsiebels.de" target="_blank" rel="noopener">Martin Siebels</a>',
      full: '<strong>Angaben gemäß § 5 TMG:</strong><br>'
        + 'Martin Siebels<br>'
        + 'Leyer Str. 38<br>'
        + '49076 Osnabrück<br>'
        + 'E-Mail: <a href="mailto:Martin_Siebels@web.de">Martin_Siebels@web.de</a>',
    },
  };

  const config = owners[owner] || owners.msbls;

  const target = document.getElementById('impressum')
    || document.querySelector('footer .container')
    || document.querySelector('footer')
    || document.body;

  if (variant === 'full') {
    renderOverlay(config.full, target);
  } else {
    renderInline(config.minimal, target);
  }

  function renderInline(html, target) {
    const el = document.createElement('div');
    el.className = 'onepager-impressum';
    el.innerHTML = html;
    el.style.cssText = 'text-align:center;font-size:0.75rem;opacity:0.6;padding:12px 0;margin-top:4px;line-height:1.7;';
    el.querySelectorAll('a').forEach(a => {
      a.style.color = 'inherit';
      a.style.textDecoration = 'underline';
      a.style.textDecorationThickness = '1px';
      a.style.textUnderlineOffset = '2px';
    });
    target.appendChild(el);
  }

  function renderOverlay(html, target) {
    // Trigger im Footer — klein, dezent, erbt Farben.
    const trigger = document.createElement('button');
    trigger.type = 'button';
    trigger.className = 'onepager-impressum-trigger';
    trigger.textContent = 'Impressum';
    trigger.style.cssText = [
      'display:inline-block',
      'background:none',
      'border:none',
      'padding:12px 8px',
      'margin-top:4px',
      'font:inherit',
      'font-size:0.75rem',
      'color:inherit',
      'opacity:0.6',
      'cursor:pointer',
      'text-decoration:underline',
      'text-decoration-thickness:1px',
      'text-underline-offset:2px',
      'transition:opacity 0.2s ease',
    ].join(';');
    trigger.addEventListener('mouseenter', () => { trigger.style.opacity = '1'; });
    trigger.addEventListener('mouseleave', () => { trigger.style.opacity = '0.6'; });
    trigger.addEventListener('focus', () => { trigger.style.opacity = '1'; });
    trigger.addEventListener('blur', () => { trigger.style.opacity = '0.6'; });

    const wrap = document.createElement('div');
    wrap.className = 'onepager-impressum';
    wrap.style.cssText = 'text-align:center;padding:8px 0;margin-top:4px;';
    wrap.appendChild(trigger);
    target.appendChild(wrap);

    let backdrop = null;
    let lastFocus = null;

    trigger.addEventListener('click', open);

    function open() {
      if (backdrop) return;
      lastFocus = document.activeElement;

      backdrop = document.createElement('div');
      backdrop.className = 'onepager-impressum-backdrop';
      backdrop.style.cssText = [
        'position:fixed',
        'inset:0',
        'background:rgba(0,0,0,0.55)',
        'display:flex',
        'align-items:center',
        'justify-content:center',
        'padding:24px',
        'z-index:99999',
        'opacity:0',
        'transition:opacity 0.18s ease',
      ].join(';');

      const card = document.createElement('div');
      card.className = 'onepager-impressum-card';
      card.setAttribute('role', 'dialog');
      card.setAttribute('aria-modal', 'true');
      card.setAttribute('aria-label', 'Impressum');
      card.style.cssText = [
        'position:relative',
        'max-width:420px',
        'width:100%',
        'background:#fff',
        'color:#111',
        'padding:32px 28px 28px',
        'border-radius:8px',
        'box-shadow:0 20px 60px rgba(0,0,0,0.35)',
        'font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif',
        'font-size:0.9rem',
        'line-height:1.55',
        'transform:translateY(8px)',
        'transition:transform 0.18s ease',
        'box-sizing:border-box',
      ].join(';');

      const close = document.createElement('button');
      close.type = 'button';
      close.setAttribute('aria-label', 'Schließen');
      close.innerHTML = '&times;';
      close.style.cssText = [
        'position:absolute',
        'top:6px',
        'right:10px',
        'background:none',
        'border:none',
        'font-size:1.6rem',
        'line-height:1',
        'color:#666',
        'cursor:pointer',
        'padding:6px 10px',
        'border-radius:4px',
        'transition:color 0.15s ease',
      ].join(';');
      close.addEventListener('mouseenter', () => { close.style.color = '#000'; });
      close.addEventListener('mouseleave', () => { close.style.color = '#666'; });
      close.addEventListener('click', dismiss);

      const content = document.createElement('div');
      content.innerHTML = html;
      content.style.cssText = 'margin-top:4px;';
      content.querySelectorAll('a').forEach(a => {
        a.style.color = '#0057b8';
        a.style.textDecoration = 'underline';
      });
      content.querySelectorAll('strong').forEach(s => {
        s.style.display = 'block';
        s.style.marginBottom = '8px';
      });

      card.appendChild(close);
      card.appendChild(content);
      backdrop.appendChild(card);
      document.body.appendChild(backdrop);

      // Trigger fade-in nach dem Mounten.
      requestAnimationFrame(() => {
        backdrop.style.opacity = '1';
        card.style.transform = 'translateY(0)';
      });

      backdrop.addEventListener('click', (e) => {
        if (e.target === backdrop) dismiss();
      });
      document.addEventListener('keydown', onKey);
      close.focus();
    }

    function dismiss() {
      if (!backdrop) return;
      document.removeEventListener('keydown', onKey);
      const node = backdrop;
      backdrop = null;
      node.style.opacity = '0';
      setTimeout(() => {
        if (node.parentNode) node.parentNode.removeChild(node);
        if (lastFocus && typeof lastFocus.focus === 'function') {
          lastFocus.focus();
        }
      }, 180);
    }

    function onKey(e) {
      if (e.key === 'Escape') {
        e.preventDefault();
        dismiss();
      }
    }
  }
})();