(() => {
  const page = document.querySelector('[data-pihole-page]');
  if (!page) return;

  const fmt = new Intl.NumberFormat('de-DE');
  const fmtDate = (ts) => {
    if (!ts) return '–';
    const d = new Date(ts * 1000);
    return d.toLocaleString('de-DE');
  };

  const apiCall = async (action, payload = {}) => {
    const res = await fetch(`/module/pihole/api?action=${encodeURIComponent(action)}`,
      {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(payload),
      }
    );
    const data = await res.json().catch(() => ({}));
    if (!res.ok) {
      throw new Error(data.error || `HTTP ${res.status}`);
    }
    return data;
  };

  const setText = (el, value) => {
    if (!el) return;
    el.textContent = value;
  };

  const statusLabel = (status) => {
    if (status === 'enabled') return 'Aktiv';
    if (status === 'disabled') return 'Deaktiviert';
    if (status === 'partial') return 'Teilweise';
    return 'Unbekannt';
  };

  const setStatusBadge = (el, status) => {
    if (!el) return;
    el.textContent = statusLabel(status);
    el.classList.remove('is-disabled', 'is-partial');
    if (status === 'disabled') el.classList.add('is-disabled');
    if (status === 'partial') el.classList.add('is-partial');
  };

  const mapToList = (map, limit = 10) => {
    if (!map || typeof map !== 'object') return [];
    const entries = Object.entries(map)
      .filter(([, value]) => typeof value === 'number' || typeof value === 'string')
      .map(([key, value]) => [key, Number(value)])
      .sort((a, b) => b[1] - a[1]);
    return entries.slice(0, limit);
  };

  const renderList = (container, map, emptyText) => {
    if (!container) return;
    const rows = mapToList(map, 10);
    container.innerHTML = '';
    if (!rows.length) {
      const div = document.createElement('div');
      div.className = 'muted';
      div.textContent = emptyText || 'Keine Daten';
      container.appendChild(div);
      return;
    }
    rows.forEach(([label, value]) => {
      const row = document.createElement('div');
      row.className = 'pihole-list-row';
      row.innerHTML = `<strong>${label}</strong><span>${fmt.format(value)}</span>`;
      container.appendChild(row);
    });
  };

  const renderBlocked = (container, list) => {
    if (!container) return;
    container.innerHTML = '';
    if (!Array.isArray(list) || !list.length) {
      const div = document.createElement('div');
      div.className = 'muted';
      div.textContent = 'Keine Daten';
      container.appendChild(div);
      return;
    }
    list.slice(0, 20).forEach((entry) => {
      const domain = entry.domain || entry;
      const instance = entry.instance || '';
      const row = document.createElement('div');
      row.className = 'pihole-blocked-row';
      row.innerHTML = `<span>${domain}</span><span class="muted">${instance}</span>`;
      container.appendChild(row);
    });
  };

  const renderInstances = (instances) => {
    const holder = document.querySelector('[data-instance-cards]');
    const tpl = document.querySelector('#pihole-instance-template');
    if (!holder || !tpl) return;
    holder.innerHTML = '';

    Object.values(instances).forEach((entry) => {
      const node = tpl.content.cloneNode(true);
      const root = node.querySelector('[data-instance]');
      if (!root) return;
      root.dataset.instance = entry.meta.id;

      const summary = entry.summary || {};
      setText(root.querySelector('[data-instance-name]'), entry.meta.name || entry.meta.id);
      setText(root.querySelector('[data-instance-url]'), entry.meta.url || '');
      setText(root.querySelector('[data-instance-dns]'), fmt.format(Number(summary.dns_queries_today || 0)));
      setText(root.querySelector('[data-instance-ads]'), fmt.format(Number(summary.ads_blocked_today || 0)));
      const percent = summary.ads_percentage_today || summary.ads_percentage || 0;
      setText(root.querySelector('[data-instance-percent]'), `${Number(percent).toFixed(2)}%`);
      setStatusBadge(root.querySelector('[data-instance-status]'), summary.status || 'unknown');

      const actions = root.querySelectorAll('[data-instance]');
      actions.forEach((btn) => {
        if (btn.dataset.instance === '') {
          btn.dataset.instance = entry.meta.id;
        }
      });
      const customInput = root.querySelector('[data-custom-minutes]');
      if (customInput) {
        customInput.dataset.customMinutes = entry.meta.id;
      }

      const updateEl = root.querySelector('[data-instance-update]');
      if (entry.updates && entry.updates.available) {
        updateEl.textContent = 'Updates verfuegbar';
      } else {
        updateEl.textContent = 'Keine Updates erkannt';
      }

      holder.appendChild(node);
    });
  };

  const bindActionButtons = () => {
    document.addEventListener('click', async (e) => {
      const btn = e.target.closest('[data-action]');
      if (!btn) return;

      const action = btn.dataset.action;
      const instance = btn.dataset.instance || 'all';
      const minutes = btn.dataset.minutes;
      const scope = btn.closest('.pihole-instance') || document;
      const customInput = scope.querySelector(`[data-custom-minutes="${instance}"]`);
      let payload = { instance };

      if (action === 'disable') {
        payload.minutes = Number(minutes || 0);
      }
      if (action === 'disable-custom') {
        payload.minutes = Number(customInput?.value || 0);
      }

      try {
        if (action === 'enable') {
          await apiCall('enable', payload);
        } else if (action === 'disable' || action === 'disable-custom') {
          if (!payload.minutes || payload.minutes <= 0) {
            alert('Bitte Minuten angeben.');
            return;
          }
          await apiCall('disable', payload);
        } else if (action === 'gravity') {
          await apiCall('gravity', payload);
          const status = document.querySelector('[data-list-update-status]');
          if (status) status.textContent = 'Listen-Update gestartet.'; 
        } else if (action === 'update') {
          await apiCall('update', payload);
        }
        await loadDashboard();
      } catch (err) {
        alert(`Aktion fehlgeschlagen: ${err.message}`);
      }
    });
  };

  const bindForms = () => {
    const domainForm = document.querySelector('[data-domain-form]');
    if (domainForm) {
      domainForm.addEventListener('submit', async (e) => {
        e.preventDefault();
        const formData = new FormData(domainForm);
        const type = String(formData.get('type') || 'block');
        const domain = String(formData.get('domain') || '').trim();
        const status = document.querySelector('[data-domain-status]');
        if (!domain) return;
        try {
          await apiCall('domain_add', { type, domain, instance: 'primary' });
          if (status) status.textContent = `Domain hinzugefuegt: ${domain}`;
          domainForm.reset();
        } catch (err) {
          if (status) status.textContent = `Fehler: ${err.message}`;
        }
      });
    }

    const adlistForm = document.querySelector('[data-adlist-form]');
    if (adlistForm) {
      adlistForm.addEventListener('submit', async (e) => {
        e.preventDefault();
        const formData = new FormData(adlistForm);
        const url = String(formData.get('url') || '').trim();
        const status = document.querySelector('[data-adlist-status]');
        if (!url) return;
        try {
          await apiCall('adlist_add', { url, instance: 'primary' });
          if (status) status.textContent = `Adlist hinzugefuegt: ${url}`;
          adlistForm.reset();
        } catch (err) {
          if (status) status.textContent = `Fehler: ${err.message}`;
        }
      });
    }
  };

  const loadDashboard = async () => {
    try {
      const data = await apiCall('dashboard');
      if (!data.ok) throw new Error(data.error || 'API error');

      const summary = data.aggregate?.summary || {};
      setText(document.querySelector('[data-summary-dns]'), fmt.format(Number(summary.dns_queries_today || 0)));
      setText(document.querySelector('[data-summary-blocked]'), fmt.format(Number(summary.ads_blocked_today || 0)));
      setText(document.querySelector('[data-summary-percent]'), `${Number(summary.ads_percentage_today || 0).toFixed(2)}%`);
      setText(document.querySelector('[data-summary-clients]'), fmt.format(Number(summary.unique_clients || 0)));
      setStatusBadge(document.querySelector('[data-summary-status]'), summary.status || 'unknown');
      setText(document.querySelector('[data-summary-last-refresh]'), `Letztes Update: ${fmtDate(data.ts)}`);

      renderInstances(data.instances || {});
      renderList(document.querySelector('[data-query-types]'), data.aggregate?.query_types, 'Keine Daten');
      renderList(document.querySelector('[data-forward-destinations]'), data.aggregate?.forward_destinations, 'Keine Daten');
      renderList(document.querySelector('[data-top-ads]'), data.aggregate?.top_ads, 'Keine Daten');
      renderList(document.querySelector('[data-top-queries]'), data.aggregate?.top_queries, 'Keine Daten');
      renderList(document.querySelector('[data-top-clients]'), data.aggregate?.query_sources, 'Keine Daten');
      renderBlocked(document.querySelector('[data-recent-blocked]'), data.aggregate?.recent_blocked);
    } catch (err) {
      const message = document.createElement('div');
      message.className = 'card';
      message.style.marginTop = '1rem';
      message.textContent = `Fehler beim Laden der Pi-hole Daten: ${err.message}`;
      page.appendChild(message);
    }
  };

  bindActionButtons();
  bindForms();
  loadDashboard();
})();