// ── API client ────────────────────────────────────────────────────────────────

const api = {
  async req(method, path, body) {
    const res = await fetch(`/api${path}`, {
      method,
      headers: body ? { 'Content-Type': 'application/json' } : undefined,
      body: body ? JSON.stringify(body) : undefined,
    });
    if (res.status === 204) return null;
    const data = await res.json().catch(() => ({}));
    if (!res.ok) {
      const err = new Error(data.error || `HTTP ${res.status}`);
      err.status = res.status;
      err.details = data.details;
      throw err;
    }
    return data;
  },
  hosts: {
    search: (q) => api.req('GET', `/hosts${q ? `?q=${encodeURIComponent(q)}` : ''}`),
    get:    (id) => api.req('GET', `/hosts/${id}`),
    getByHardwareId: (hwid) => api.req('GET', `/hosts/by-hardware-id/${encodeURIComponent(hwid)}`),
    create: (h) => api.req('POST', '/hosts', h),
    update: (id, h) => api.req('PUT', `/hosts/${id}`, h),
    delete: (id) => api.req('DELETE', `/hosts/${id}`),
  },
  sites: {
    list: () => api.req('GET', '/sites'),
    create: (name) => api.req('POST', '/sites', { name }),
    update: (id, name) => api.req('PUT', `/sites/${id}`, { name }),
    delete: (id) => api.req('DELETE', `/sites/${id}`),
  },
  rooms: {
    list: (siteId) => api.req('GET', `/rooms${siteId ? `?site_id=${siteId}` : ''}`),
    create: (site_id, name) => api.req('POST', '/rooms', { site_id, name }),
    update: (id, site_id, name) => api.req('PUT', `/rooms/${id}`, { site_id, name }),
    delete: (id) => api.req('DELETE', `/rooms/${id}`),
  },
  serverTypes: {
    list: () => api.req('GET', '/server-types'),
    create: (name) => api.req('POST', '/server-types', { name }),
    update: (id, name) => api.req('PUT', `/server-types/${id}`, { name }),
    delete: (id) => api.req('DELETE', `/server-types/${id}`),
  },
  interfaces: {
    list:   (hostId)   => api.req('GET',    `/interfaces?host_id=${hostId}`),
    create: (body)     => api.req('POST',   '/interfaces', body),
    update: (id, body) => api.req('PUT',    `/interfaces/${id}`, body),
    delete: (id)       => api.req('DELETE', `/interfaces/${id}`),
  },
};

const IFACE_FIELDS = ['name', 'mac_address', 'ip_address', 'subnet', 'link_speed'];
const IFACE_PLACEHOLDERS = {
  name:        'eth0',
  mac_address: 'aa:bb:cc:dd:ee:ff',
  ip_address:  '10.0.0.1',
  subnet:      '10.0.0.0/24',
  link_speed:  '1000/full',
};

// ── Helpers ───────────────────────────────────────────────────────────────────

const $ = (sel, root = document) => root.querySelector(sel);
const $$ = (sel, root = document) => Array.from(root.querySelectorAll(sel));

function el(tag, attrs = {}, ...children) {
  const node = document.createElement(tag);
  for (const [k, v] of Object.entries(attrs)) {
    if (k === 'class') node.className = v;
    else if (k === 'dataset') Object.assign(node.dataset, v);
    else if (k.startsWith('on') && typeof v === 'function') node.addEventListener(k.slice(2), v);
    else if (v === true) node.setAttribute(k, '');
    else if (v !== false && v != null) node.setAttribute(k, v);
  }
  for (const c of children.flat()) {
    if (c == null || c === false) continue;
    node.appendChild(typeof c === 'string' ? document.createTextNode(c) : c);
  }
  return node;
}

function openModal(id) {
  const m = document.getElementById(id);
  m.hidden = false;
}
function closeModal(id) {
  const m = document.getElementById(id);
  m.hidden = true;
}

// ── Routing ───────────────────────────────────────────────────────────────────

const heroEl = $('#hero');
const resultsEl = $('#results');
const detailEl = $('#detail');
const resultsBody = $('#results-body');
const resultsEmpty = $('#results-empty');
const searchInput = $('#search-input');

let currentView = 'search';
let currentHardwareId = null;

function navigate(path, { replace = false } = {}) {
  history[replace ? 'replaceState' : 'pushState']({}, '', path);
  handleRoute();
}

function handleRoute() {
  const m = /^\/hosts\/(.+)$/.exec(location.pathname);
  if (m) showDetail(decodeURIComponent(m[1]));
  else showSearch();
}

function showSearch() {
  currentView = 'search';
  currentHardwareId = null;
  detailEl.hidden = true;
  heroEl.hidden = false;
  // Preserve whatever results are already rendered (don't auto-trigger lookup)
  const hasInput = searchInput.value.trim().length > 0;
  heroEl.classList.toggle('compact', hasInput);
  const hasContent = resultsBody.children.length > 0 || !resultsEmpty.hidden;
  resultsEl.hidden = !(hasInput && hasContent);
}

async function showDetail(hardwareId) {
  currentView = 'detail';
  currentHardwareId = hardwareId;
  heroEl.hidden = true;
  resultsEl.hidden = true;
  detailEl.hidden = false;
  await renderDetail(hardwareId);
}

window.addEventListener('popstate', handleRoute);

// ── Lookup ────────────────────────────────────────────────────────────────────

async function runLookup() {
  if (currentView !== 'search') return;
  const q = searchInput.value.trim();
  if (!q) return;

  heroEl.classList.add('compact');
  resultsEl.hidden = false;
  resultsBody.replaceChildren();
  resultsEmpty.hidden = false;
  resultsEmpty.textContent = 'Looking up…';

  let rows = [];
  try {
    rows = await api.hosts.search(q);
  } catch (err) {
    resultsEmpty.textContent = `Lookup failed: ${err.message}`;
    return;
  }

  if (rows.length === 1) {
    // Clear the lookup-in-progress state so back-navigation lands clean
    resultsEmpty.hidden = true;
    resultsEl.hidden = true;
    navigate(`/hosts/${encodeURIComponent(rows[0].hardware_id)}`);
    return;
  }

  if (rows.length === 0) {
    resultsEmpty.textContent = 'Host not found.';
    return;
  }

  renderResults(rows);
}

function renderResults(rows) {
  resultsBody.replaceChildren();
  resultsEmpty.hidden = rows.length > 0;
  if (rows.length === 0) {
    resultsEmpty.textContent = 'Host not found.';
    return;
  }
  for (const h of rows) {
    resultsBody.appendChild(renderHostRow(h));
  }
}

function renderHostRow(host) {
  const link = el('a', {
    class: 'host-link',
    href: `/hosts/${encodeURIComponent(host.hardware_id)}`,
    'data-nav': '',
  }, host.hostname);
  const row = el('tr',
    { dataset: { id: host.id } },
    el('td', {}, link),
    el('td', {}, host.hardware_id),
    el('td', {}, host.asset_id),
    el('td',
      { class: 'actions-cell' },
      el('button', { class: 'btn-link', onclick: () => openHostModal(host) }, 'Edit'),
      el('button',
        { class: 'btn-link btn-link-danger', onclick: (e) => beginDelete(e, host) },
        'Delete'),
    ),
  );
  return row;
}

function beginDelete(e, host) {
  const cell = e.target.closest('td');
  const original = cell.cloneNode(true);
  // re-wire the original's button handlers when we restore it
  const restore = () => {
    cell.replaceWith(original);
    // rebind handlers on the restored cell
    const [editBtn, delBtn] = original.querySelectorAll('button');
    editBtn.addEventListener('click', () => openHostModal(host));
    delBtn.addEventListener('click', (ev) => beginDelete(ev, host));
  };
  cell.replaceChildren(
    el('span', { class: 'confirm-inline' },
      'Delete this host?',
      el('button', {
        class: 'btn-link btn-link-danger',
        onclick: async () => {
          try {
            await api.hosts.delete(host.id);
            cell.closest('tr').remove();
            if (resultsBody.children.length === 0) {
              resultsEmpty.hidden = false;
              resultsEmpty.textContent = 'No hosts match.';
            }
          } catch (err) {
            alert(`Delete failed: ${err.message}`);
            restore();
          }
        },
      }, 'Yes'),
      el('button', { class: 'btn-link', onclick: restore }, 'No'),
    ),
  );
}

$('#lookup-form').addEventListener('submit', (e) => {
  e.preventDefault();
  runLookup();
});

// ── Detail page ───────────────────────────────────────────────────────────────

async function renderDetail(hardwareId) {
  detailEl.replaceChildren(el('div', { class: 'manage-empty' }, 'Loading…'));
  let host;
  try {
    host = await api.hosts.getByHardwareId(hardwareId);
  } catch (err) {
    detailEl.replaceChildren(
      el('a', { class: 'back-link', href: '/', 'data-nav': '' }, '\u2190 Back to search'),
      el('div', { class: 'banner banner-error' },
        err.status === 404 ? 'Host not found.' : `Failed to load host: ${err.message}`),
    );
    return;
  }

  const back = el('a', { class: 'back-link', href: '/', 'data-nav': '' }, '\u2190 Back to search');
  const title = el('h1', { class: 'detail-title' }, host.hostname);
  const subtitle = el('p', { class: 'detail-subtitle' },
    `${host.site_name} \u00b7 ${host.room_name}${host.position ? ` \u00b7 ${host.position}` : ''}`);

  const list = el('dl', { class: 'detail-list' },
    el('dt', {}, 'Hardware ID'),  el('dd', {}, host.hardware_id),
    el('dt', {}, 'Asset ID'),     el('dd', {}, host.asset_id),
    el('dt', {}, 'Site'),         el('dd', {}, host.site_name),
    el('dt', {}, 'Room'),         el('dd', {}, host.room_name),
    el('dt', {}, 'Position'),     host.position
      ? el('dd', {}, host.position)
      : el('dd', { class: 'empty' }, '\u2014'),
    el('dt', {}, 'Server Type'),  el('dd', {}, host.server_type),
    el('dt', {}, 'Created'),      el('dd', {}, host.created_at),
    el('dt', {}, 'Updated'),      el('dd', {}, host.updated_at),
  );

  const actions = el('div', { class: 'detail-actions', id: 'detail-actions' },
    el('button', { class: 'btn btn-primary', onclick: () => openHostModal(host) }, 'Edit'),
    el('button', { class: 'btn btn-ghost', onclick: () => beginDeleteFromDetail(host) }, 'Delete'),
  );

  const interfacesSection = await renderInterfacesSection(host);

  detailEl.replaceChildren(back, title, subtitle, list, interfacesSection, actions);
}

async function renderInterfacesSection(host) {
  const tbody = el('tbody', { id: 'interfaces-body' });
  const empty = el('div', { class: 'results-empty', id: 'interfaces-empty', hidden: true },
    'No interfaces.');

  const addBtn = el('button', { class: 'btn btn-ghost btn-sm' }, '+ Add interface');
  addBtn.addEventListener('click', () => {
    empty.hidden = true;
    tbody.appendChild(buildIfaceEditRow(host, null));
  });

  const section = el('section', { class: 'interfaces' },
    el('div', { class: 'interfaces-header' },
      el('h2', {}, 'Network'),
      addBtn,
    ),
    el('table', { class: 'table' },
      el('thead', {},
        el('tr', {},
          el('th', {}, 'Interface'),
          el('th', {}, 'Ethernet'),
          el('th', {}, 'IP Address'),
          el('th', {}, 'Subnet'),
          el('th', {}, 'Link'),
          el('th', { class: 'actions-col' }),
        ),
      ),
      tbody,
    ),
    empty,
  );

  let ifaces = [];
  try {
    ifaces = await api.interfaces.list(host.id);
  } catch (err) {
    section.appendChild(el('div', { class: 'iface-error' },
      `Failed to load interfaces: ${err.message}`));
    return section;
  }

  if (ifaces.length === 0) {
    empty.hidden = false;
  } else {
    for (const iface of ifaces) tbody.appendChild(buildIfaceRow(host, iface));
  }
  return section;
}

function fieldOrDash(value) {
  return value ? value : el('span', { class: 'muted' }, '\u2014');
}

function buildIfaceRow(host, iface) {
  const row = el('tr', { dataset: { ifaceId: iface.id } });
  const cells = IFACE_FIELDS.map((f) => el('td', {}, fieldOrDash(iface[f])));
  const actions = el('td', { class: 'actions-cell' });
  row.append(...cells, actions);
  setIfaceDisplayActions(row, host, iface, actions);
  return row;
}

function setIfaceDisplayActions(row, host, iface, actionsCell) {
  actionsCell.replaceChildren(
    el('button', { class: 'btn-link', onclick: () => enterIfaceEdit(row, host, iface) }, 'Edit'),
    el('button', {
      class: 'btn-link btn-link-danger',
      onclick: () => beginIfaceDelete(row, host, iface, actionsCell),
    }, 'Delete'),
  );
}

function enterIfaceEdit(row, host, iface) {
  const editRow = buildIfaceEditRow(host, iface);
  row.replaceWith(editRow);
}

function buildIfaceEditRow(host, iface) {
  const isNew = iface == null;
  const row = el('tr', { class: 'iface-edit-row' });
  const inputs = {};
  for (const f of IFACE_FIELDS) {
    const input = el('input', {
      class: 'iface-edit-input',
      type: 'text',
      name: f,
      placeholder: IFACE_PLACEHOLDERS[f],
      value: iface?.[f] ?? '',
    });
    inputs[f] = input;
    row.appendChild(el('td', {}, input));
  }
  const actions = el('td', { class: 'actions-cell' });
  row.appendChild(actions);

  let errorRow = null;
  const showError = (msg) => {
    clearError();
    errorRow = el('tr', { class: 'iface-error-row' },
      el('td', { colspan: IFACE_FIELDS.length + 1 },
        el('div', { class: 'iface-error' }, msg)));
    row.parentNode.insertBefore(errorRow, row);
  };
  const clearError = () => { if (errorRow) { errorRow.remove(); errorRow = null; } };

  const cancel = el('button', {
    class: 'btn-link',
    onclick: () => {
      clearError();
      if (isNew) {
        row.remove();
        const tbody = $('#interfaces-body');
        if (tbody && tbody.children.length === 0) {
          const emptyEl = $('#interfaces-empty');
          if (emptyEl) emptyEl.hidden = false;
        }
      } else {
        const display = buildIfaceRow(host, iface);
        row.replaceWith(display);
      }
    },
  }, 'Cancel');

  const save = el('button', {
    class: 'btn-link',
    onclick: async () => {
      clearError();
      const payload = { host_id: host.id };
      for (const f of IFACE_FIELDS) payload[f] = inputs[f].value.trim();
      if (!payload.name) {
        showError('Interface name is required.');
        return;
      }
      try {
        const saved = isNew
          ? await api.interfaces.create(payload)
          : await api.interfaces.update(iface.id, payload);
        const display = buildIfaceRow(host, saved);
        row.replaceWith(display);
        const emptyEl = $('#interfaces-empty');
        if (emptyEl) emptyEl.hidden = true;
      } catch (err) {
        const detailMsg = err.details?.length ? `: ${err.details.join('; ')}` : '';
        showError(`${err.message}${detailMsg}`);
      }
    },
  }, 'Save');

  actions.append(save, cancel);
  return row;
}

function beginIfaceDelete(row, host, iface, actionsCell) {
  actionsCell.replaceChildren(
    el('span', { class: 'confirm-inline' },
      'Delete this interface?',
      el('button', {
        class: 'btn-link btn-link-danger',
        onclick: async () => {
          try {
            await api.interfaces.delete(iface.id);
            row.remove();
            const tbody = $('#interfaces-body');
            if (tbody && tbody.children.length === 0) {
              const emptyEl = $('#interfaces-empty');
              if (emptyEl) emptyEl.hidden = false;
            }
          } catch (err) {
            alert(`Delete failed: ${err.message}`);
            setIfaceDisplayActions(row, host, iface, actionsCell);
          }
        },
      }, 'Yes'),
      el('button', {
        class: 'btn-link',
        onclick: () => setIfaceDisplayActions(row, host, iface, actionsCell),
      }, 'No'),
    ),
  );
}

function beginDeleteFromDetail(host) {
  const actions = $('#detail-actions');
  if (!actions) return;
  actions.replaceChildren(
    el('span', { class: 'confirm-inline' },
      'Delete this host?',
      el('button', {
        class: 'btn btn-danger btn-sm',
        onclick: async () => {
          try {
            await api.hosts.delete(host.id);
            navigate('/');
          } catch (err) {
            alert(`Delete failed: ${err.message}`);
            renderDetail(host.hardware_id);
          }
        },
      }, 'Yes, delete'),
      el('button', { class: 'btn btn-ghost btn-sm', onclick: () => renderDetail(host.hardware_id) }, 'Cancel'),
    ),
  );
}

// ── Host modal ────────────────────────────────────────────────────────────────

const hostModal = $('#host-modal');
const hostForm = $('#host-form');
const hostError = $('#host-error');
const hostTitle = $('#host-modal-title');

let hostBeingEdited = null;
let cachedSites = [];
let cachedServerTypes = [];

async function openHostModal(host = null) {
  hostBeingEdited = host;
  hostTitle.textContent = host ? 'Edit host' : 'New host';
  hostError.hidden = true;
  hostError.textContent = '';
  hostForm.reset();

  await loadDropdowns();

  if (host) {
    hostForm.elements.hostname.value    = host.hostname;
    hostForm.elements.hardware_id.value = host.hardware_id;
    hostForm.elements.asset_id.value    = host.asset_id;
    hostForm.elements.position.value    = host.position ?? '';
    hostForm.elements.site_id.value     = host.site_id;
    await refreshRoomsSelect(host.site_id, host.room_id);
    hostForm.elements.server_type_id.value = host.server_type_id;
  } else {
    if (cachedSites[0]) {
      hostForm.elements.site_id.value = cachedSites[0].id;
      await refreshRoomsSelect(cachedSites[0].id);
    }
    if (cachedServerTypes[0]) {
      hostForm.elements.server_type_id.value = cachedServerTypes[0].id;
    }
  }

  openModal('host-modal');
  setTimeout(() => hostForm.elements.hostname.focus(), 50);
}

async function loadDropdowns() {
  const [sites, serverTypes] = await Promise.all([
    api.sites.list(),
    api.serverTypes.list(),
  ]);
  cachedSites = sites;
  cachedServerTypes = serverTypes;

  const siteSel = hostForm.elements.site_id;
  siteSel.replaceChildren(...sites.map((s) =>
    el('option', { value: s.id }, s.name)));

  const typeSel = hostForm.elements.server_type_id;
  typeSel.replaceChildren(...serverTypes.map((t) =>
    el('option', { value: t.id }, t.name)));
}

async function refreshRoomsSelect(siteId, selectedRoomId = null) {
  const roomSel = hostForm.elements.room_id;
  if (!siteId) {
    roomSel.replaceChildren();
    return;
  }
  const rooms = await api.rooms.list(siteId);
  roomSel.replaceChildren(...rooms.map((r) =>
    el('option', { value: r.id }, r.name)));
  if (selectedRoomId != null) roomSel.value = selectedRoomId;
}

hostForm.elements.site_id.addEventListener('change', (e) => {
  refreshRoomsSelect(Number(e.target.value));
});

hostForm.addEventListener('submit', async (e) => {
  e.preventDefault();
  hostError.hidden = true;
  const fd = new FormData(hostForm);
  const payload = {
    hostname:       fd.get('hostname').trim(),
    hardware_id:    fd.get('hardware_id').trim(),
    asset_id:       fd.get('asset_id').trim(),
    room_id:        Number(fd.get('room_id')),
    position:       (fd.get('position') ?? '').trim(),
    server_type_id: Number(fd.get('server_type_id')),
  };
  let saved;
  try {
    saved = hostBeingEdited
      ? await api.hosts.update(hostBeingEdited.id, payload)
      : await api.hosts.create(payload);
  } catch (err) {
    hostError.textContent = err.details?.length
      ? `${err.message}: ${err.details.join('; ')}`
      : err.message;
    hostError.hidden = false;
    return;
  }
  closeModal('host-modal');
  // Always land on the saved host's page. If we were already on detail and the
  // hardware_id didn't change, replace so back doesn't bounce.
  const url = `/hosts/${encodeURIComponent(saved.hardware_id)}`;
  const replace = currentView === 'detail' && currentHardwareId === saved.hardware_id;
  navigate(url, { replace });
});

$('#new-host-btn').addEventListener('click', () => openHostModal(null));

$('.brand').addEventListener('click', () => {
  searchInput.value = '';
  resultsBody.replaceChildren();
  resultsEmpty.hidden = true;
  resultsEmpty.textContent = 'No hosts match.';
});

// ── Manage modal ──────────────────────────────────────────────────────────────

const manageModal = $('#manage-modal');
const manageBody = $('#manage-body');
let activeTab = 'sites';

$('#manage-btn').addEventListener('click', async () => {
  openModal('manage-modal');
  await renderManageTab();
});

$$('.tab').forEach((btn) => {
  btn.addEventListener('click', async () => {
    $$('.tab').forEach((b) => b.classList.toggle('tab-active', b === btn));
    activeTab = btn.dataset.tab;
    await renderManageTab();
  });
});

async function renderManageTab() {
  manageBody.replaceChildren(el('div', { class: 'manage-empty' }, 'Loading…'));
  if (activeTab === 'sites')        await renderSitesTab();
  if (activeTab === 'rooms')        await renderRoomsTab();
  if (activeTab === 'server-types') await renderTypesTab();
}

async function renderSitesTab() {
  const items = await api.sites.list();
  manageBody.replaceChildren(buildLookupList({
    items,
    placeholder: 'New site name',
    onCreate: (name) => api.sites.create(name),
    onUpdate: (id, name) => api.sites.update(id, name),
    onDelete: (id) => api.sites.delete(id),
    rerender: renderSitesTab,
  }));
}

async function renderTypesTab() {
  const items = await api.serverTypes.list();
  manageBody.replaceChildren(buildLookupList({
    items,
    placeholder: 'New server type',
    onCreate: (name) => api.serverTypes.create(name),
    onUpdate: (id, name) => api.serverTypes.update(id, name),
    onDelete: (id) => api.serverTypes.delete(id),
    rerender: renderTypesTab,
  }));
}

function buildLookupList({ items, placeholder, onCreate, onUpdate, onDelete, rerender }) {
  const list = el('div', { class: 'manage-list' });

  // Add row
  const addInput = el('input', { type: 'text', placeholder, maxlength: 100 });
  const addBtn = el('button', {
    class: 'btn btn-primary btn-sm',
    onclick: async () => {
      const name = addInput.value.trim();
      if (!name) return;
      try {
        await onCreate(name);
        await rerender();
      } catch (err) {
        alert(err.message);
      }
    },
  }, 'Add');
  list.appendChild(el('div', { class: 'manage-row add-row' }, addInput, addBtn));

  if (items.length === 0) {
    list.appendChild(el('div', { class: 'manage-empty' }, 'No entries yet.'));
    return list;
  }

  for (const item of items) {
    list.appendChild(buildLookupRow(item, onUpdate, onDelete, rerender));
  }
  return list;
}

function buildLookupRow(item, onUpdate, onDelete, rerender) {
  const row = el('div', { class: 'manage-row' });
  const labelCell = el('div', { class: 'label' }, item.name);
  const actions = el('div', {});

  const editBtn = el('button', {
    class: 'btn-link',
    onclick: () => enterEdit(),
  }, 'Edit');
  const delBtn = el('button', {
    class: 'btn-link btn-link-danger',
    onclick: () => confirmDelete(),
  }, 'Delete');
  actions.append(editBtn, delBtn);
  row.append(labelCell, actions);

  function enterEdit() {
    const input = el('input', { type: 'text', value: item.name, maxlength: 100 });
    const save = el('button', {
      class: 'btn-link',
      onclick: async () => {
        const name = input.value.trim();
        if (!name) return;
        try {
          await onUpdate(item.id, name);
          await rerender();
        } catch (err) { alert(err.message); }
      },
    }, 'Save');
    const cancel = el('button', { class: 'btn-link', onclick: rerender }, 'Cancel');
    labelCell.replaceChildren(input);
    actions.replaceChildren(save, cancel);
  }

  function confirmDelete() {
    actions.replaceChildren(
      el('span', { class: 'confirm-inline' },
        'Delete?',
        el('button', {
          class: 'btn-link btn-link-danger',
          onclick: async () => {
            try {
              await onDelete(item.id);
              await rerender();
            } catch (err) { alert(err.message); rerender(); }
          },
        }, 'Yes'),
        el('button', { class: 'btn-link', onclick: rerender }, 'No'),
      ),
    );
  }

  return row;
}

async function renderRoomsTab() {
  const [rooms, sites] = await Promise.all([api.rooms.list(), api.sites.list()]);

  if (sites.length === 0) {
    manageBody.replaceChildren(el('div', { class: 'manage-empty' },
      'Add a site first.'));
    return;
  }

  const list = el('div', { class: 'manage-list' });

  // Add row
  const siteSel = el('select', {},
    ...sites.map((s) => el('option', { value: s.id }, s.name)));
  const nameInput = el('input', { type: 'text', placeholder: 'New room name', maxlength: 100 });
  const addBtn = el('button', {
    class: 'btn btn-primary btn-sm',
    onclick: async () => {
      const name = nameInput.value.trim();
      if (!name) return;
      try {
        await api.rooms.create(Number(siteSel.value), name);
        await renderRoomsTab();
      } catch (err) { alert(err.message); }
    },
  }, 'Add');
  list.appendChild(el('div', { class: 'manage-row add-row' },
    el('div', { class: 'grow' }, siteSel, nameInput),
    addBtn,
  ));

  if (rooms.length === 0) {
    list.appendChild(el('div', { class: 'manage-empty' }, 'No rooms yet.'));
    manageBody.replaceChildren(list);
    return;
  }

  for (const room of rooms) {
    list.appendChild(buildRoomRow(room, sites));
  }
  manageBody.replaceChildren(list);
}

function buildRoomRow(room, sites) {
  const row = el('div', { class: 'manage-row' });
  const label = el('div', { class: 'label' },
    el('span', { class: 'muted' }, `${room.site_name} ·`),
    room.name);
  const actions = el('div', {});

  const editBtn = el('button', { class: 'btn-link', onclick: enterEdit }, 'Edit');
  const delBtn = el('button', { class: 'btn-link btn-link-danger', onclick: confirmDelete }, 'Delete');
  actions.append(editBtn, delBtn);
  row.append(label, actions);

  function enterEdit() {
    const siteSel = el('select', {},
      ...sites.map((s) => el('option', { value: s.id, selected: s.id === room.site_id }, s.name)));
    const input = el('input', { type: 'text', value: room.name, maxlength: 100 });
    const save = el('button', {
      class: 'btn-link',
      onclick: async () => {
        const name = input.value.trim();
        if (!name) return;
        try {
          await api.rooms.update(room.id, Number(siteSel.value), name);
          await renderRoomsTab();
        } catch (err) { alert(err.message); }
      },
    }, 'Save');
    const cancel = el('button', { class: 'btn-link', onclick: renderRoomsTab }, 'Cancel');
    label.replaceChildren(el('div', { class: 'grow' }, siteSel, input));
    actions.replaceChildren(save, cancel);
  }

  function confirmDelete() {
    actions.replaceChildren(
      el('span', { class: 'confirm-inline' },
        'Delete?',
        el('button', {
          class: 'btn-link btn-link-danger',
          onclick: async () => {
            try {
              await api.rooms.delete(room.id);
              await renderRoomsTab();
            } catch (err) { alert(err.message); renderRoomsTab(); }
          },
        }, 'Yes'),
        el('button', { class: 'btn-link', onclick: renderRoomsTab }, 'No'),
      ),
    );
  }

  return row;
}

// ── Modal close handlers ──────────────────────────────────────────────────────

document.addEventListener('click', (e) => {
  const closeId = e.target.dataset?.closeModal;
  if (closeId) closeModal(closeId);
  // click on backdrop
  if (e.target.classList.contains('modal')) {
    closeModal(e.target.id);
  }

  // SPA navigation for in-app links
  const link = e.target.closest('a[data-nav]');
  if (link && !e.metaKey && !e.ctrlKey && !e.shiftKey && !e.altKey && e.button === 0) {
    e.preventDefault();
    navigate(link.getAttribute('href'));
  }
});

document.addEventListener('keydown', (e) => {
  if (e.key === 'Escape') {
    $$('.modal').forEach((m) => { if (!m.hidden) m.hidden = true; });
  }
});

// ── Bootstrap ─────────────────────────────────────────────────────────────────

handleRoute();