const dataNode = document.getElementById('initial-status');

if (dataNode) {
  let currentStatus = JSON.parse(dataNode.textContent || '{}');
  let activeMachine = 'all';
  const gridNode = document.getElementById('machine-grid');
  const filterNode = document.getElementById('machine-filter');
  const alertNode = document.getElementById('alert-list');
  const generatedAtNode = document.getElementById('generated-at');

  const escapeHtml = (value) =>
    String(value)
      .replaceAll('&', '&')
      .replaceAll('<', '&lt;')
      .replaceAll('>', '&gt;')
      .replaceAll('"', '&quot;')
      .replaceAll("'", '&#039;');

  const formatTime = (isoValue) => {
    if (!isoValue) {
      return 'Noch keine Messung';
    }

    const parsed = new Date(isoValue);
    if (Number.isNaN(parsed.getTime())) {
      return isoValue;
    }

    return parsed.toLocaleString('de-DE', {
      day: '2-digit',
      month: '2-digit',
      year: 'numeric',
      hour: '2-digit',
      minute: '2-digit',
    });
  };

  const renderFilters = () => {
    const machines = currentStatus.machines || [];
    const buttons = [
      `<button class="chip ${activeMachine === 'all' ? 'chip--active' : ''}" data-machine="all">Alle</button>`,
      ...machines.map(
        (machine) =>
          `<button class="chip ${activeMachine === machine.id ? 'chip--active' : ''}" data-machine="${escapeHtml(
            machine.id
          )}">${escapeHtml(machine.name)}</button>`
      ),
    ];

    filterNode.innerHTML = buttons.join('');
  };

  const slotCard = (slot) => {
    const fillPercent = slot.fill_percent ?? 0;
    const units = slot.units_estimated ?? '–';
    const maxUnits = slot.max_units ?? '–';
    const state = slot.state || 'unknown';
    const stateLabel =
      state === 'critical' ? 'Kritisch' : state === 'ok' ? 'Stabil' : 'Unbekannt';

    return `
      <article class="slot-card slot-card--${escapeHtml(state)}">
        <div class="slot-card__head">
          <div>
            <p class="slot-card__label">${escapeHtml(slot.slot_label || slot.sensor_id)}</p>
            <h3>${escapeHtml(slot.product_name || 'Nicht zugeordnet')}</h3>
          </div>
          <span class="status-pill status-pill--${escapeHtml(state)}">${stateLabel}</span>
        </div>
        <div class="slot-card__body">
          <div class="fill-tube" style="--fill:${fillPercent}%">
            <div class="fill-tube__liquid" style="height:${fillPercent}%"></div>
            <div class="fill-tube__gloss"></div>
          </div>
          <div class="slot-card__metrics">
            <p><strong>${fillPercent}%</strong> Fuellstand</p>
            <p><strong>${units}</strong> / ${maxUnits} Flaschen</p>
            <p>Alarm unter <strong>${slot.alert_below_units ?? 0}</strong></p>
            <p>Messwert: <strong>${slot.distance_mm ?? '–'} mm</strong></p>
            <p>Update: <strong>${formatTime(slot.measured_at)}</strong></p>
          </div>
        </div>
      </article>
    `;
  };

  const renderMachines = () => {
    const machines = (currentStatus.machines || []).filter(
      (machine) => activeMachine === 'all' || machine.id === activeMachine
    );

    if (!machines.length) {
      gridNode.innerHTML = '<p class="empty-state">Keine Automaten fuer die aktuelle Auswahl gefunden.</p>';
      return;
    }

    gridNode.innerHTML = machines
      .map(
        (machine) => `
          <section class="machine-panel">
            <div class="machine-panel__head">
              <div>
                <p class="eyebrow">Automat</p>
                <h2>${escapeHtml(machine.name)}</h2>
              </div>
              <p>${escapeHtml(machine.location || 'Kein Standort hinterlegt')}</p>
            </div>
            <div class="slot-grid">
              ${(machine.slots || []).map(slotCard).join('')}
            </div>
          </section>
        `
      )
      .join('');
  };

  const renderAlerts = () => {
    const alerts = currentStatus.alerts || [];
    if (!alerts.length) {
      alertNode.innerHTML =
        '<p class="empty-state">Noch keine Zustandswechsel registriert.</p>';
      return;
    }

    alertNode.innerHTML = alerts
      .slice(0, 12)
      .map((entry) => {
        const payload = entry.payload || {};
        const stateClass = payload.event === 'critical' ? 'critical' : 'ok';
        const stateText = payload.event === 'critical' ? 'Alarm' : 'Entwarnung';
        return `
          <article class="alert-entry alert-entry--${escapeHtml(stateClass)}">
            <div>
              <p class="alert-entry__title">${stateText}: ${escapeHtml(
                payload.machine_name || payload.machine_id || 'Automat'
              )} / ${escapeHtml(payload.slot_label || payload.sensor_id || 'Fach')}</p>
              <p>${escapeHtml(payload.product_name || 'Ohne Produktname')} • Bestand ${
                payload.units_estimated ?? '–'
              } / ${payload.max_units ?? '–'} • ${payload.fill_percent ?? '–'}%</p>
            </div>
            <time>${formatTime(entry.created_at)}</time>
          </article>
        `;
      })
      .join('');
  };

  const updateSummary = () => {
    const summary = currentStatus.summary || {};
    Object.entries(summary).forEach(([key, value]) => {
      const node = document.querySelector(`[data-summary="${key}"]`);
      if (node) {
        node.textContent = value;
      }
    });
    if (generatedAtNode) {
      generatedAtNode.textContent = formatTime(currentStatus.generated_at);
    }
  };

  const render = () => {
    renderFilters();
    renderMachines();
    renderAlerts();
    updateSummary();
  };

  filterNode.addEventListener('click', (event) => {
    const target = event.target.closest('[data-machine]');
    if (!target) {
      return;
    }
    activeMachine = target.dataset.machine || 'all';
    render();
  });

  const refresh = async () => {
    try {
      const response = await fetch('/api/v1/status.php', { cache: 'no-store' });
      if (!response.ok) {
        return;
      }
      currentStatus = await response.json();
      render();
    } catch (error) {
      console.error('Status-Aktualisierung fehlgeschlagen', error);
    }
  };

  render();
  const refreshSeconds = currentStatus.app?.dashboard_refresh_seconds || 15;
  window.setInterval(refresh, refreshSeconds * 1000);
}