function setDashboardTab(tab, { scroll = true } = {}) {
  const next = ['main', 'thermostats', 'manual'].includes(tab) ? tab : 'main';
  app.dashboardTab = next;
  $$('[data-dashboard-tab]').forEach(button => {
    const active = button.dataset.dashboardTab === next;
    button.classList.toggle('active', active);
    button.setAttribute('aria-selected', String(active));
  });
  $$('[data-dashboard-panel]').forEach(panel => {
    const active = panel.dataset.dashboardPanel === next;
    panel.classList.toggle('active', active);
    panel.hidden = !active;
  });
  if (scroll && app.currentView === 'dashboard') window.scrollTo({ top: 0, behavior: 'smooth' });
}

function showView(name, { push = true, scroll = true } = {}) {
  if (!canLeaveCurrentView(name)) return false;
  if (name !== 'flows' && !$('#flowEditor')?.hidden) closeFlowEditor({ push: false, force: true });
  app.currentView = name;
  $$('.view').forEach(view => view.classList.toggle('active', view.dataset.view === name));
  $$('.bottom-nav button').forEach(button => button.classList.toggle('active', button.dataset.nav === name || (button.dataset.nav === 'more' && ['devices', 'groups', 'schedules', 'automations', 'simulation', 'night', 'homeassistant', 'settings', 'logs'].includes(name))));
  if (push) updateBrowserUrl(pathForView(name));
  if (scroll) window.scrollTo({ top: 0, behavior: 'smooth' });
  if (name === 'dashboard') setDashboardTab(app.dashboardTab, { scroll: false });
  if (name === 'history') { renderHistoryNavigation(); loadHistory(); }
  if (name === 'logs') loadLogs();
  return true;
}

function showHistoryTab(tab, { push = true, load = true } = {}) {
  app.historyTab = HISTORY_TABS.includes(tab) ? tab : 'overview';
  renderHistoryNavigation();
  if (push) updateBrowserUrl(currentHistoryPath());
  if (load) loadHistory();
}

function confirmManualCommandForDisabledZone(id) {
  const zone = disabledZoneForDevice(id);
  if (!zone) return true;
  return confirm(tr('devices.manualDisabledZoneConfirm', { zone: zone.name }));
}

function pingSamples(id) {
  if (!app.pingMonitor.samples[id]) app.pingMonitor.samples[id] = [];
  return app.pingMonitor.samples[id];
}

function addPingSample(id, value, error = '') {
  const samples = pingSamples(id);
  samples.push({ at: Date.now(), value: Number.isFinite(Number(value)) ? Math.max(0, Math.round(Number(value))) : null, error: String(error || '') });
  if (samples.length > 36) samples.splice(0, samples.length - 36);
}

function pingSparkline(samples) {
  const width = 360, height = 92, padX = 8, padY = 9;
  if (!samples.length) return `<div class="ping-empty">${esc(tr('devices.pingNoSamples'))}</div>`;

  const valid = samples.map((sample, index) => ({ index, value: sample.value == null ? NaN : Number(sample.value) })).filter(item => Number.isFinite(item.value));
  const values = valid.map(item => item.value);
  const min = values.length ? Math.min(...values) : 0;
  const max = values.length ? Math.max(...values) : 10;
  const ceiling = Math.max(max, 10);
  const floor = Math.min(min, 0);
  const range = Math.max(1, ceiling - floor);
  const lastIndex = Math.max(1, samples.length - 1);
  const pointFor = (index, value) => {
    const x = padX + (index / lastIndex) * (width - padX * 2);
    const y = height - padY - ((value - floor) / range) * (height - padY * 2);
    return `${x.toFixed(1)},${y.toFixed(1)}`;
  };

  // Keep successful ping runs separate so a packet loss never gets hidden by a line
  // connecting the samples before and after the failed request.
  const runs = [];
  let currentRun = [];
  samples.forEach((sample, index) => {
    const value = sample.value == null ? NaN : Number(sample.value);
    if (Number.isFinite(value)) {
      currentRun.push(pointFor(index, value));
    } else if (currentRun.length) {
      runs.push(currentRun);
      currentRun = [];
    }
  });
  if (currentRun.length) runs.push(currentRun);

  const lineRuns = runs.map(points => points.length === 1
    ? `<circle class="ping-success-point" cx="${points[0].split(',')[0]}" cy="${points[0].split(',')[1]}" r="1.8"></circle>`
    : `<polyline class="ping-success-line" points="${points.join(' ')}"></polyline>`
  ).join('');

  // Failed requests are packet-loss / unavailability samples. Draw a red band and
  // an X at each failed position so even a single loss is immediately visible.
  const losses = samples.map((sample, index) => ({ sample, index })).filter(({ sample }) => sample.value == null).map(({ index }) => {
    const x = padX + (index / lastIndex) * (width - padX * 2);
    const bandWidth = Math.max(4, Math.min(10, (width - padX * 2) / Math.max(samples.length, 12)));
    const left = Math.max(0, x - bandWidth / 2);
    const markerY = height - padY - 5;
    return `<g class="ping-loss-marker"><rect x="${left.toFixed(1)}" y="${padY}" width="${bandWidth.toFixed(1)}" height="${height - padY * 2}" rx="2"></rect><path d="M ${(x - 3).toFixed(1)} ${(markerY - 3).toFixed(1)} L ${(x + 3).toFixed(1)} ${(markerY + 3).toFixed(1)} M ${(x + 3).toFixed(1)} ${(markerY - 3).toFixed(1)} L ${(x - 3).toFixed(1)} ${(markerY + 3).toFixed(1)}"></path></g>`;
  }).join('');

  const guide = [0.25, 0.5, 0.75].map(ratio => `<line x1="${padX}" y1="${(height * ratio).toFixed(1)}" x2="${width - padX}" y2="${(height * ratio).toFixed(1)}"></line>`).join('');
  return `<svg class="ping-sparkline" viewBox="0 0 ${width} ${height}" preserveAspectRatio="none" role="img" aria-label="${esc(tr('devices.pingLive'))}"><g class="ping-grid-lines">${guide}</g>${lineRuns}${losses}</svg>`;
}

function pingStats(samples) {
  const values = samples.map(sample => sample.value == null ? NaN : Number(sample.value)).filter(Number.isFinite);
  if (!values.length) return { current: null, average: null, min: null, max: null };
  const current = [...samples].reverse().find(sample => sample.value != null && Number.isFinite(Number(sample.value)))?.value ?? null;
  return {
    current,
    average: Math.round(values.reduce((sum, value) => sum + value, 0) / values.length),
    min: Math.min(...values),
    max: Math.max(...values),
  };
}

function pingValue(value) {
  return Number.isFinite(Number(value)) ? `${Math.round(Number(value))} ms` : '—';
}

function renderPingDialog() {
  const dialog = $('#pingDialog');
  const select = $('#pingDeviceSelect');
  const all = $('#pingAllDevices');
  const toggle = $('#pingToggleButton');
  const grid = $('#pingLiveGrid');
  if (!dialog || !select || !all || !toggle || !grid) return;
  if (!app.pingMonitor.targetId || !app.devices.some(device => device.id === app.pingMonitor.targetId)) app.pingMonitor.targetId = app.devices[0]?.id || '';
  select.innerHTML = app.devices.map(device => `<option value="${esc(device.id)}" ${device.id === app.pingMonitor.targetId ? 'selected' : ''}>${esc(device.name)}</option>`).join('');
  select.disabled = app.pingMonitor.all;
  all.checked = app.pingMonitor.all;
  toggle.textContent = tr(app.pingMonitor.running ? 'devices.pingStop' : 'devices.pingStart');
  toggle.classList.toggle('primary', app.pingMonitor.running);
  toggle.classList.toggle('secondary', !app.pingMonitor.running);
  const devices = app.pingMonitor.all ? app.devices : app.devices.filter(device => device.id === app.pingMonitor.targetId);
  grid.innerHTML = devices.length ? devices.map(device => {
    const samples = pingSamples(device.id);
    const stats = pingStats(samples);
    const last = samples.length ? samples[samples.length - 1] : null;
    const state = last?.error
      ? `<span class="ping-state error">${esc(tr('devices.pingFailed'))}</span>`
      : last?.value != null
        ? `<span class="ping-state online">${esc(tr('devices.pingResponding'))}</span>`
        : `<span class="ping-state ${device.online ? 'online' : ''}">${esc(tr(device.online ? 'status.online' : 'status.offline'))}</span>`;
    return `<article class="ping-live-card">
      <div class="ping-live-head"><div><strong>${esc(device.name)}</strong><small>${esc(device.ip)}</small></div>${state}</div>
      ${pingSparkline(samples)}
      <div class="ping-stat-grid">
        <div><span>${esc(tr('devices.pingCurrent'))}</span><strong>${esc(pingValue(stats.current))}</strong></div>
        <div><span>${esc(tr('devices.pingAverage'))}</span><strong>${esc(pingValue(stats.average))}</strong></div>
        <div><span>${esc(tr('devices.pingMin'))}</span><strong>${esc(pingValue(stats.min))}</strong></div>
        <div><span>${esc(tr('devices.pingMax'))}</span><strong>${esc(pingValue(stats.max))}</strong></div>
      </div>
      <small class="ping-sample-count">${esc(tr('devices.pingSamples'))}: ${samples.length}${last?.error ? ` · ${esc(last.error)}` : ''}</small>
    </article>`;
  }).join('') : `<div class="empty"><strong>${esc(tr('devices.emptyTitle'))}</strong>${esc(tr('devices.emptyText'))}</div>`;
}

function schedulePingCycle(delay = null) {
  clearTimeout(app.pingMonitor.timer);
  app.pingMonitor.timer = null;
  if (!app.pingMonitor.running || !$('#pingDialog')?.open) return;
  const interval = delay == null ? (app.pingMonitor.all ? 5000 : 3000) : delay;
  app.pingMonitor.timer = setTimeout(runPingCycle, interval);
}

async function runPingCycle() {
  if (!app.pingMonitor.running || !$('#pingDialog')?.open || app.pingMonitor.inFlight) return;
  const targets = app.pingMonitor.all ? [...app.devices] : app.devices.filter(device => device.id === app.pingMonitor.targetId);
  if (!targets.length) { renderPingDialog(); schedulePingCycle(); return; }
  app.pingMonitor.inFlight = true;
  await Promise.allSettled(targets.map(async (device, index) => {
    // Spread all-unit diagnostics and skip a device while explicit manual control is pending.
    // This keeps control traffic higher priority than the live diagnostic chart.
    if (app.pingMonitor.all && index > 0) await new Promise(resolve => setTimeout(resolve, index * 250));
    if (!app.pingMonitor.running || !$('#pingDialog')?.open) return;
    if (app.deviceControlQueue[device.id] || app.deviceTemperatureDrafts[device.id]) return;
    try {
      const result = await api(`/api/devices/${encodeURIComponent(device.id)}/probe`, { method: 'POST' });
      addPingSample(device.id, result.response_time_ms);
    } catch (error) {
      addPingSample(device.id, null, error.message || String(error));
    }
  }));
  app.pingMonitor.inFlight = false;
  renderPingDialog();
  schedulePingCycle();
}

function startPingMonitor() {
  if (!app.devices.length) return;
  app.pingMonitor.running = true;
  renderPingDialog();
  clearTimeout(app.pingMonitor.timer);
  app.pingMonitor.timer = null;
  runPingCycle();
}

function stopPingMonitor() {
  app.pingMonitor.running = false;
  clearTimeout(app.pingMonitor.timer);
  app.pingMonitor.timer = null;
  renderPingDialog();
}

function openDevicePing(id) {
  app.pingMonitor.targetId = id || app.devices[0]?.id || '';
  app.pingMonitor.all = false;
  openDialog('pingDialog');
  renderPingDialog();
  startPingMonitor();
}

async function sendDeviceCommand(id, commandOrFactory, { disabledZoneConfirmed = false } = {}) {
  const disabledZone = disabledZoneForDevice(id);
  if (disabledZone && !disabledZoneConfirmed && !confirmManualCommandForDisabledZone(id)) return false;
  const previous = app.deviceControlQueue[id] || Promise.resolve();
  const request = previous.catch(() => { }).then(() => {
    const current = app.devices.find(device => device.id === id);
    const command = typeof commandOrFactory === 'function' ? commandOrFactory(current) : commandOrFactory;
    const body = disabledZone ? { ...command, manual_override: true } : command;
    return api(`/api/devices/${encodeURIComponent(id)}/command`, { method: 'POST', body });
  });
  app.deviceControlQueue[id] = request;
  try {
    const device = await request;
    updateDevice(device); renderAll();
    return true;
  } catch (error) {
    toast(error.message, true);
    try { await loadBootstrap(); } catch (_) { }
    return false;
  } finally {
    if (app.deviceControlQueue[id] === request) delete app.deviceControlQueue[id];
  }
}

function queueDeviceTemperature(id, delta) {
  const device = app.devices.find(item => item.id === id);
  if (!device) return;
  let draft = app.deviceTemperatureDrafts[id];
  const disabledZone = disabledZoneForDevice(id);
  if (disabledZone && !draft?.disabledZoneConfirmed) {
    if (!confirmManualCommandForDisabledZone(id)) return;
    draft = { ...(draft || {}), disabledZoneConfirmed: true };
  }
  const next = clamp(Number(draft?.target ?? device.target_temperature) + Number(delta), 8, 30);
  device.target_temperature = next;
  clearTimeout(draft?.timer);
  draft = {
    ...(draft || {}),
    target: next,
    timer: setTimeout(async () => {
      const pending = app.deviceTemperatureDrafts[id];
      if (!pending) return;
      delete app.deviceTemperatureDrafts[id];
      await sendDeviceCommand(id, { target_temperature: pending.target }, { disabledZoneConfirmed: pending.disabledZoneConfirmed === true });
    }, 300),
  };
  app.deviceTemperatureDrafts[id] = draft;
  renderDevices();
}

function enqueueClimateControlTask(task) {
  const previous = app.climateControlQueue || Promise.resolve();
  const request = previous.catch(() => { }).then(task);
  app.climateControlQueue = request;
  request.finally(() => {
    if (app.climateControlQueue === request) app.climateControlQueue = null;
  }).catch(() => { });
  return request;
}

function updateDevice(device) {
  const index = app.devices.findIndex(item => item.id === device.id);
  if (index >= 0) app.devices[index] = device; else app.devices.push(device);
}

function enqueueZoneControlRequest(id, patch) {
  const previous = app.zoneControlQueue[id] || Promise.resolve();
  const request = previous.catch(() => { }).then(() =>
    api(`/api/zones/${encodeURIComponent(id)}/control`, { method: 'POST', body: patch })
  );
  app.zoneControlQueue[id] = request;
  request.finally(() => {
    if (app.zoneControlQueue[id] === request) delete app.zoneControlQueue[id];
  }).catch(() => { });
  return request;
}

async function sendZoneLocalPower(id, power) {
  const sequence = (app.zoneControlSeq[id] || 0) + 1;
  app.zoneControlSeq[id] = sequence;
  try {
    const zone = await enqueueZoneControlRequest(id, { power });
    if (app.zoneControlSeq[id] !== sequence) return;
    const index = app.zones.findIndex(item => item.id === zone.id);
    if (index >= 0) app.zones[index] = zone; else app.zones.push(zone);
    renderAll(); scheduleControlPlanLoad(); toast(tr('zones.localPowerUpdated'));
  } catch (error) {
    if (app.zoneControlSeq[id] === sequence) { await loadBootstrap(); toast(error.message, true); }
  }
}

async function sendZoneControl(id, patch) {
  const sequence = (app.zoneControlSeq[id] || 0) + 1;
  app.zoneControlSeq[id] = sequence;
  try {
    const zone = await enqueueZoneControlRequest(id, patch);
    if (app.zoneControlSeq[id] !== sequence) return;
    const index = app.zones.findIndex(item => item.id === zone.id);
    if (index >= 0) app.zones[index] = zone; else app.zones.push(zone);
    renderSummary(); renderZones(); scheduleControlPlanLoad();
  } catch (error) {
    if (app.zoneControlSeq[id] === sequence) { await loadBootstrap(); toast(error.message, true); }
  }
}



async function cancelCompressorTask(id) {
  try {
    const result = await api(`/api/zones/${encodeURIComponent(id)}/compressor-queue/cancel`, { method: 'POST' });
    if (result.zone) {
      const index = app.zones.findIndex(item => item.id === result.zone.id);
      if (index >= 0) app.zones[index] = result.zone; else app.zones.push(result.zone);
    }
    renderAll(); scheduleControlPlanLoad();
    toast(tr(result.cancelled ? 'zones.queuedCancelled' : 'zones.noQueuedTask'));
  } catch (error) { toast(error.message, true); }
}

async function cancelAllCompressorTasks() {
  try {
    const result = await api('/api/compressor-queue/cancel-all', { method: 'POST' });
    (result.zones || []).forEach(zone => {
      const index = app.zones.findIndex(item => item.id === zone.id);
      if (index >= 0) app.zones[index] = zone; else app.zones.push(zone);
    });
    renderAll(); scheduleControlPlanLoad();
    toast(tr('zones.queuedCancelledAll', { count: Number(result.cancelled || 0) }));
  } catch (error) { toast(error.message, true); }
}

function queueZoneTemperature(zone, value, { snapToHalf = true } = {}) {
  const clamped = clamp(value, 8, 30);
  const next = snapToHalf ? Math.round(clamped * 2) / 2 : Math.round(clamped * 10) / 10;
  zone.manual_setpoint = next;
  zone.setpoint = next;
  zone.effective_setpoint = next;
  renderZones();
  clearTimeout(app.zoneTemperatureTimers[zone.id]);
  app.zoneTemperatureTimers[zone.id] = setTimeout(() => sendZoneControl(zone.id, { setpoint: next }), 160);
}

function beginInlineTemperatureEdit(target) {
  if (!target || target.querySelector('input') || target.dataset.editable === 'false') return;
  const kind = target.dataset.temperatureKind;
  const id = target.dataset.id;
  if (kind === 'device' && app.deviceTemperatureDrafts[id]) {
    clearTimeout(app.deviceTemperatureDrafts[id].timer);
    delete app.deviceTemperatureDrafts[id];
  }
  const value = parseDecimal(target.dataset.value);
  if (!Number.isFinite(value) || !kind || !id) return;
  const decimals = kind === 'zone' ? 1 : 0;
  const input = document.createElement('input');
  input.className = 'inline-temperature-input';
  input.type = 'text';
  input.inputMode = 'decimal';
  input.value = value.toFixed(decimals);
  input.setAttribute('aria-label', tr('common.targetTemperature'));
  input.title = tr('common.targetTemperature');
  target.classList.add('editing');
  target.replaceChildren(input);
  input.focus();
  input.select();

  let finished = false;
  const finish = async commit => {
    if (finished) return;
    finished = true;
    const parsed = parseDecimal(input.value);
    if (!commit || !Number.isFinite(parsed) || parsed < 8 || parsed > 30) {
      if (commit && (!Number.isFinite(parsed) || parsed < 8 || parsed > 30)) toast(tr('validation.range', { min: 8, max: 30 }), true);
      renderAll();
      return;
    }
    if (kind === 'zone') {
      const zone = app.zones.find(item => item.id === id);
      if (zone) queueZoneTemperature(zone, parsed, { snapToHalf: false });
      return;
    }
    const device = app.devices.find(item => item.id === id);
    if (device) await sendDeviceCommand(id, { target_temperature: Math.round(clamp(parsed, 8, 30)) });
  };
  input.addEventListener('keydown', event => {
    if (event.key === 'Enter') { event.preventDefault(); input.blur(); }
    if (event.key === 'Escape') { event.preventDefault(); finished = true; renderAll(); }
  });
  input.addEventListener('blur', () => finish(true), { once: true });
}

function showDiscoveryNames(ids) {
  const wanted = new Set(Array.isArray(ids) ? ids : []);
  const devices = app.devices.filter(device => wanted.has(device.id));
  if (!devices.length) return;
  const list = $('#discoveryNamesList');
  list.innerHTML = devices.map(device => `
    <label class="discovery-name-row">
      <span><strong>${esc(device.model || 'GREE')}</strong><small>${esc(device.ip)} · ${esc(device.mac)} · ${device.protocol_version === 2 ? 'V2 GCM' : 'V1 ECB'}</small></span>
      <input data-device-id="${esc(device.id)}" maxlength="80" required value="${esc(device.name)}">
    </label>`).join('');
  openDialog('discoveryNamesDialog');
}

function populateDeviceRename(id) {
  const device = app.devices.find(item => item.id === id); if (!device) return;
  const form = $('#renameDeviceForm'); form.reset();
  form.id.value = device.id; form.name.value = device.name; form.ip.value = device.ip; form.port.value = String(device.port ?? 7000); form.protocol_version.value = String(device.protocol_version ?? 0);
  const result = $('#deviceConfigCheckResult');
  if (result) { result.hidden = true; result.textContent = ''; result.classList.remove('success', 'error'); }
  openDialog('renameDeviceDialog');
}

async function deleteEntity(type, id, labelKey) {
  if (!confirm(tr('confirm.delete', { label: tr(labelKey) }))) return;
  try { await api(`/api/${type}/${encodeURIComponent(id)}`, { method: 'DELETE' }); await loadBootstrap(); toast(tr('common.removed')); }
  catch (error) { toast(error.message, true); }
}

function openDialog(id) {
  fillSelects();
  const dialog = document.getElementById(id);
  if (dialog && !dialog.open) {
    const form = $('form', dialog);
    if (form) { clearFormErrors(form); markFormClean(form); }
    dialog.showModal();
  }
}

function updateZoneHysteresisFields({ syncFromCommon = false } = {}) {
  const form = $('#zoneForm');
  if (!form) return;
  const separate = !!form.separate_hysteresis?.checked;
  $('#commonHysteresisField').hidden = separate;
  $('#separateHysteresisFields').hidden = !separate;
  if (separate && syncFromCommon && form.dataset.separateHysteresisInitialized !== 'true') {
    const common = parseDecimal(form.hysteresis.value);
    if (Number.isFinite(common)) {
      form.cool_hysteresis.value = String(common);
      form.heat_hysteresis.value = String(common);
    }
    form.dataset.separateHysteresisInitialized = 'true';
  }
}

function updateZoneSensorFields() {
  const form = $('#zoneForm');
  if (!form) return;
  const external = form.sensor_source.value !== 'device';
  $('#externalSensorFields').hidden = !external;
  form.ha_entity_id.required = external;
}

function updateSchedulePresetField() {
  const form = $('#scheduleForm'); if (!form) return;
  $('#scheduleSetpointField').hidden = form.preset.value !== 'custom';
  form.setpoint.required = form.preset.value === 'custom';
}

function updateAutomationTargetFields() {
  const form = $('#automationForm'); if (!form) return;
  const groupTarget = form.action_target_kind.value === 'group';
  $('#automationDeviceTarget').hidden = groupTarget;
  $('#automationGroupTarget').hidden = !groupTarget;
  $('#automationGroupPreset').hidden = !groupTarget;
  $('#automationTargetTemperature').hidden = groupTarget;
  $('#automationGroupHint').hidden = !groupTarget;
  form.action_device_id.required = !groupTarget;
  form.action_group_id.required = groupTarget;
  form.action_target_temperature.disabled = groupTarget;
  if (groupTarget) form.action_target_temperature.value = '';
  [...form.action_mode.options].forEach(option => {
    if (!['dry', 'fan'].includes(option.value)) return;
    option.disabled = groupTarget;
    option.hidden = groupTarget;
  });
  if (groupTarget && ['dry', 'fan'].includes(form.action_mode.value)) form.action_mode.value = '';
}

function populateZone(id) {
  const item = app.zones.find(v => v.id === id); if (!item) return;
  const form = $('#zoneForm');
  form.reset();
  form.dataset.editingZoneId = item.id;
  form.elements.id.value = item.id;
  fillSelects();
  Object.entries(item).forEach(([key, value]) => { if (key !== 'id' && form.elements[key] && value != null && typeof value !== 'object') form.elements[key].value = value; });
  form.mode_policy.value = item.inherit_house_mode ? 'house' : (item.mode || 'cool');
  if (Number(item.profile_version || 0) === 0) {
    if ((item.mode || 'cool') === 'heat') form.heat_comfort_setpoint.value = Number(item.setpoint ?? 21);
    else form.cool_comfort_setpoint.value = Number(item.setpoint ?? 23);
  }
  form.external_sensor_weight_percent.value = Math.round(Number(item.external_sensor_weight ?? 0.4) * 100);
  form.max_sensor_difference.value = Number(item.max_sensor_difference ?? 3);
  form.min_adjust_seconds.value = Number(item.min_adjust_seconds ?? 120);
  form.standby_offset_c.value = Number(item.standby_offset_c ?? 2);
  form.smart_fan.checked = item.smart_fan !== false;
  form.separate_hysteresis.checked = item.separate_hysteresis === true;
  const commonHysteresis = Number(item.hysteresis ?? 0.6);
  form.cool_hysteresis.value = Number(item.separate_hysteresis ? (item.cool_hysteresis ?? commonHysteresis) : commonHysteresis);
  form.heat_hysteresis.value = Number(item.separate_hysteresis ? (item.heat_hysteresis ?? commonHysteresis) : commonHysteresis);
  form.dataset.separateHysteresisInitialized = item.separate_hysteresis === true ? 'true' : 'false';
  form.enabled.checked = item.enabled; updateZoneSensorFields(); updateZoneHysteresisFields(); openDialog('zoneDialog');
}

const dateTimeLocalValue = value => {
  const date = value instanceof Date ? value : new Date(value);
  if (!Number.isFinite(date.getTime())) return '';
  const pad = number => String(number).padStart(2, '0');
  return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())}T${pad(date.getHours())}:${pad(date.getMinutes())}`;
};

function updateTemporaryThermostatFields() {
  const form = $('#temporaryThermostatForm'); if (!form) return;
  const startKind = form.start_kind.value;
  const kind = form.finish_kind.value;
  const startDelay = $('#temporaryStartDelayFields');
  const startAt = $('#temporaryStartAtFields');
  const duration = $('#temporaryDurationFields');
  const until = $('#temporaryUntilFields');
  const temperature = $('#temporaryTemperatureFields');
  const schedule = $('#temporaryScheduleFields');
  startDelay.hidden = startKind !== 'delay';
  startAt.hidden = startKind !== 'at';
  duration.hidden = kind !== 'duration';
  until.hidden = kind !== 'until';
  temperature.hidden = !['temperature_reached', 'temperature_stable'].includes(kind);
  schedule.hidden = kind !== 'schedule_boundary';
  $('#temporaryHoldField').hidden = kind !== 'temperature_stable';
  form.start_delay_minutes.required = startKind === 'delay';
  form.start_at.required = startKind === 'at';
  form.duration_minutes.required = kind === 'duration';
  form.until.required = kind === 'until';
  form.hold_minutes.required = kind === 'temperature_stable';
}

function populateTemporaryThermostat(id) {
  const zone = app.zones.find(item => item.id === id); if (!zone) return;
  const form = $('#temporaryThermostatForm');
  form.reset();
  form.elements.zone_id.value = zone.id;
  form.target_temperature.value = Number(zone.manual_setpoint ?? zone.effective_setpoint ?? zone.setpoint ?? 23).toFixed(1);
  form.start_kind.value = 'now';
  form.start_delay_minutes.value = '30';
  form.start_at.value = dateTimeLocalValue(new Date(Date.now() + 60 * 60 * 1000));
  form.until.value = dateTimeLocalValue(new Date(Date.now() + 2 * 60 * 60 * 1000));
  const session = zone.temporary_quick_thermostat;
  const activeSession = !!session?.activated_at;
  form.dataset.activeSession = activeSession ? 'true' : 'false';
  if (session) {
    form.start_kind.value = session.start_kind || (new Date(session.started_at).getTime() > Date.now() ? 'at' : 'now');
    if (form.start_kind.value === 'delay' && session.started_at) {
      form.start_delay_minutes.value = Math.max(1, Math.ceil((new Date(session.started_at).getTime() - Date.now()) / 60000));
    }
    if (form.start_kind.value === 'at' && session.started_at) form.start_at.value = dateTimeLocalValue(session.started_at);
    form.finish_kind.value = session.finish_kind || 'duration';
    if (session.temperature_target != null) form.target_temperature.value = Number(session.temperature_target).toFixed(1);
    if (session.temperature_operator) form.temperature_operator.value = session.temperature_operator;
    form.tolerance_c.value = Number(session.tolerance_c ?? 0.3).toFixed(1);
    if (session.hold_seconds) form.hold_minutes.value = Math.max(1, Math.round(Number(session.hold_seconds) / 60));
    if (session.finish_kind === 'duration') {
      if (session.duration_seconds) {
        form.duration_minutes.value = Math.max(1, Math.round(Number(session.duration_seconds) / 60));
      } else if (session.expires_at) {
        const base = new Date(session.activated_at || session.started_at || Date.now()).getTime();
        form.duration_minutes.value = Math.max(1, Math.round((new Date(session.expires_at).getTime() - base) / 60000));
      }
    }
    if (session.expires_at && session.finish_kind !== 'duration') form.until.value = dateTimeLocalValue(session.expires_at);
    if (session.safety_duration_seconds) {
      form.max_duration_minutes.value = Math.max(1, Math.round(Number(session.safety_duration_seconds) / 60));
    } else if (session.safety_expires_at) {
      const base = new Date(session.activated_at || session.started_at || Date.now()).getTime();
      form.max_duration_minutes.value = Math.max(1, Math.round((new Date(session.safety_expires_at).getTime() - base) / 60000));
    } else if (['temperature_reached', 'temperature_stable'].includes(session.finish_kind)) {
      form.max_duration_minutes.value = '';
    }
  }

  form.start_kind.disabled = activeSession;
  form.start_delay_minutes.disabled = activeSession;
  form.start_at.disabled = activeSession;
  $$('[data-temporary-start-delay]').forEach(button => { button.disabled = activeSession; });

  updateTemporaryThermostatFields();
  const active = $('#temporaryThermostatActive');
  active.hidden = !session;
  $('#temporaryThermostatStop').dataset.id = zone.id;
  $('#temporaryThermostatSubmit').textContent = tr(session ? 'zones.temporaryUpdate' : 'zones.temporaryStart');
  updateTemporaryThermostatCountdowns();
  openDialog('temporaryThermostatDialog');
  updateTemporaryThermostatCountdowns();
}

function populateSchedule(id) {
  const item = app.schedules.find(v => v.id === id); if (!item) return;
  const form = $('#scheduleForm'); form.reset(); fillSelects();
  ['id', 'name', 'zone_id', 'start_time', 'end_time', 'setpoint', 'preset'].forEach(key => { if (form.elements[key] && item[key] != null) form.elements[key].value = item[key]; });
  form.enabled.checked = item.enabled;
  $$('[name=weekday]', form).forEach(input => input.checked = item.weekdays.includes(Number(input.value)));
  updateSchedulePresetField(); openDialog('scheduleDialog');
}

function populateAutomation(id) {
  const item = app.automations.find(v => v.id === id); if (!item) return;
  const form = $('#automationForm'); form.reset(); fillSelects();
  ['id', 'name', 'trigger_kind', 'trigger_device_id', 'threshold', 'at_time', 'action_device_id', 'cooldown_seconds'].forEach(key => { if (form.elements[key] && item[key] != null) form.elements[key].value = item[key]; });
  const groupTarget = !!item.action_group_id;
  form.action_target_kind.value = groupTarget ? 'group' : 'device';
  if (groupTarget) form.action_group_id.value = item.action_group_id;
  form.action_power.value = item.action.power == null ? '' : String(item.action.power);
  form.action_mode.value = item.action.mode || '';
  form.action_preset.value = item.action_preset || '';
  form.action_target_temperature.value = item.action.target_temperature ?? '';
  form.enabled.checked = item.enabled;
  updateAutomationTargetFields();
  openDialog('automationDialog');
}