// inventree - vanilla JS driving the inventory tree and AJAX panels.
// No build step, no frameworks: plain DOM APIs + fetch.
//
// Interaction model: the tree and panels behave like a native file manager.
// Left click selects/opens. Right click (or the keyboard Menu key, which
// browsers also fire as a "contextmenu" event) opens a context menu with
// the actions available for whatever was clicked - a folder, an asset, or
// empty background (which offers "New Folder" / "Add Asset" for wherever
// you right-clicked). There are intentionally very few standalone buttons.
(function () {
  'use strict';

  var treePane = document.getElementById('tree-pane');
  var mainPanel = document.getElementById('main-panel');
  var isAdmin = document.body.classList.contains('role-admin');
  var draggedNode = null;

  // ---------------------------------------------------------------------
  // Generic helpers
  // ---------------------------------------------------------------------

  function escapeHtml(s) {
    return String(s).replace(/[&<>"']/g, function (c) {
      return { '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[c];
    });
  }

  async function fetchText(url) {
    var res = await fetch(url);
    if (!res.ok) throw new Error('Request failed (' + res.status + ')');
    return res.text();
  }

  async function apiFetch(url, opts) {
    opts = opts || {};
    var fetchOpts = { method: opts.method || 'GET', headers: {} };
    if (opts.json !== undefined) {
      fetchOpts.headers['Content-Type'] = 'application/json';
      fetchOpts.body = JSON.stringify(opts.json);
    }
    var res = await fetch(url, fetchOpts);
    var body = null;
    var ct = res.headers.get('content-type') || '';
    if (ct.indexOf('application/json') !== -1) {
      body = await res.json();
    }
    if (!res.ok) {
      var msg = (body && body.error) ? body.error : ('Request failed (' + res.status + ')');
      throw new Error(msg);
    }
    return body ? body.data : null;
  }

  // ---------------------------------------------------------------------
  // Main panel navigation
  // ---------------------------------------------------------------------

  async function loadPanel(type, id) {
    var url;
    if (type === 'root') url = '/app/panel/root';
    else if (type === 'folder') url = '/app/panel/folders/' + id;
    else if (type === 'asset') url = '/app/panel/assets/' + id;
    else return;
    var html = await fetchText(url);
    mainPanel.innerHTML = html;
    mainPanel.dataset.contextType = type;
    mainPanel.dataset.contextId = id || '';
  }

  async function reloadCurrentPanel() {
    var type = mainPanel.dataset.contextType || 'root';
    var id = mainPanel.dataset.contextId || '';
    if (type !== 'root' && type !== 'folder' && type !== 'asset') return;
    await loadPanel(type, id);
  }

  function selectTreeRowVisually(type, id) {
    document.querySelectorAll('.tree-row.selected').forEach(function (r) { r.classList.remove('selected'); });
    var row;
    if (type === 'root') {
      row = document.querySelector('.tree-row[data-type="root"]');
    } else {
      var node = document.querySelector('.tree-node[data-type="' + type + '"][data-id="' + id + '"]');
      row = node ? node.querySelector(':scope > .tree-row') : null;
    }
    if (row) row.classList.add('selected');
  }

  async function navigateAndSelect(type, id) {
    await loadPanel(type, id);
    selectTreeRowVisually(type, id);
  }

  async function selectNode(row) {
    document.querySelectorAll('.tree-row.selected').forEach(function (r) { r.classList.remove('selected'); });
    row.classList.add('selected');
    var type = row.dataset.type;
    var id = row.dataset.id || '';
    await loadPanel(type, id);
  }

  // ---------------------------------------------------------------------
  // Tree: refresh / expand / collapse
  // ---------------------------------------------------------------------

  async function refreshWholeTree() {
    var ul = document.getElementById('top-level-children');
    if (!ul) return;
    var html = await fetchText('/app/tree/children');
    ul.innerHTML = html;
  }

  async function toggleFolder(toggleBtn) {
    var li = toggleBtn.closest('.tree-node');
    var childUl = li.querySelector(':scope > ul.tree-children');
    var id = toggleBtn.dataset.id;
    var expanded = toggleBtn.classList.contains('expanded');
    if (expanded) {
      toggleBtn.classList.remove('expanded');
      if (childUl) childUl.classList.add('d-none');
      fetch('/app/tree/collapse', {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        body: 'folder_id=' + encodeURIComponent(id),
      });
    } else {
      toggleBtn.classList.add('expanded');
      if (childUl) {
        childUl.classList.remove('d-none');
        var html = await fetchText('/app/tree/children?parent_id=' + encodeURIComponent(id) + '&persist=1');
        childUl.innerHTML = html;
      }
    }
  }

  async function expandAllUnder(ul) {
    var folderLis = Array.prototype.filter.call(ul.children, function (li) {
      return li.dataset && li.dataset.type === 'folder';
    });
    for (var i = 0; i < folderLis.length; i++) {
      var li = folderLis[i];
      var toggle = li.querySelector(':scope > .tree-row > .tree-toggle');
      if (toggle && !toggle.classList.contains('expanded')) {
        await toggleFolder(toggle);
      }
      var childUl = li.querySelector(':scope > ul.tree-children');
      if (childUl) await expandAllUnder(childUl);
    }
  }

  async function expandAllHandler() {
    var top = document.getElementById('top-level-children');
    if (top) await expandAllUnder(top);
  }

  async function collapseAllHandler() {
    document.querySelectorAll('.tree-toggle.expanded').forEach(function (t) {
      t.classList.remove('expanded');
      var li = t.closest('.tree-node');
      var childUl = li ? li.querySelector(':scope > ul.tree-children') : null;
      if (childUl) childUl.classList.add('d-none');
    });
    try { await fetch('/app/tree/collapse-all', { method: 'POST' }); } catch (e) { /* ignore */ }
  }

  // ---------------------------------------------------------------------
  // Generic right-click context menu
  // ---------------------------------------------------------------------

  var ctxMenu = null;

  function ensureCtxMenu() {
    if (ctxMenu) return ctxMenu;
    ctxMenu = document.createElement('div');
    ctxMenu.className = 'dropdown-menu ctx-menu';
    ctxMenu.style.display = 'none';
    document.body.appendChild(ctxMenu);
    return ctxMenu;
  }

  function closeCtxMenu() {
    if (ctxMenu) ctxMenu.style.display = 'none';
  }

  // showContextMenu renders `items` (each {label, icon, danger, action} or
  // {divider:true}) as a floating menu at the given viewport coordinates,
  // clamped so it never runs off-screen.
  function showContextMenu(x, y, items) {
    items = items.filter(function (item, i) {
      // Collapse a divider that would be first, last, or doubled.
      if (!item.divider) return true;
      var prevIsDivider = i === 0 || items[i - 1].divider;
      var isLast = i === items.length - 1;
      return !prevIsDivider && !isLast;
    });
    if (items.length === 0) return;

    var menu = ensureCtxMenu();
    menu.innerHTML = items.map(function (item) {
      if (item.divider) return '<div class="dropdown-divider"></div>';
      var cls = 'dropdown-item' + (item.danger ? ' text-danger' : '');
      return '<button type="button" class="' + cls + '"><i class="bi ' + (item.icon || '') + '"></i> ' + escapeHtml(item.label) + '</button>';
    }).join('');

    var buttons = menu.querySelectorAll('button.dropdown-item');
    var actionable = items.filter(function (i) { return !i.divider; });
    buttons.forEach(function (btn, i) {
      btn.addEventListener('click', function () {
        closeCtxMenu();
        actionable[i].action();
      });
    });

    menu.style.display = 'block';
    menu.style.left = '0px';
    menu.style.top = '0px';
    var rect = menu.getBoundingClientRect();
    var left = Math.min(x, window.innerWidth - rect.width - 8);
    var top = Math.min(y, window.innerHeight - rect.height - 8);
    menu.style.left = Math.max(4, left) + 'px';
    menu.style.top = Math.max(4, top) + 'px';
  }

  document.addEventListener('click', function (e) {
    if (ctxMenu && ctxMenu.style.display === 'block' && !ctxMenu.contains(e.target)) closeCtxMenu();
  });
  document.addEventListener('keydown', function (e) {
    if (e.key === 'Escape') closeCtxMenu();
  });
  window.addEventListener('scroll', closeCtxMenu, true);
  window.addEventListener('resize', closeCtxMenu);

  // ---- Menu builders per target kind -----------------------------------

  function folderMenuItems(id) {
    var items = [];
    if (isAdmin) {
      items.push({ label: 'New Subfolder', icon: 'bi-folder-plus', action: function () { openFolderModal({ parentId: id }); } });
      items.push({ label: 'Add Asset', icon: 'bi-plus-lg', action: function () { loadAssetForm({ folderId: id }); } });
      items.push({ divider: true });
      items.push({ label: 'Rename', icon: 'bi-pencil', action: function () { openRenameFolder(id); } });
      items.push({ divider: true });
      items.push({ label: 'Import CSV…', icon: 'bi-upload', action: function () { openImportModal(id); } });
    }
    items.push({ label: 'Export CSV', icon: 'bi-download', action: function () { window.location = '/export/assets.csv?folder_id=' + id + '&recursive=1'; } });
    items.push({ label: 'Print Labels…', icon: 'bi-qr-code', action: function () { window.open('/labels?folder_id=' + id + '&recursive=1', '_blank'); } });
    if (isAdmin) {
      items.push({ divider: true });
      items.push({ label: 'Delete', icon: 'bi-trash', danger: true, action: function () { startDeleteFolder(id); } });
    }
    return items;
  }

  function assetMenuItems(id) {
    var items = [{ label: 'Open', icon: 'bi-box-arrow-up-right', action: function () { navigateAndSelect('asset', id); } }];
    items.push({ label: 'Print Label', icon: 'bi-qr-code', action: function () { window.open('/labels?asset_id=' + id, '_blank'); } });
    if (isAdmin) {
      items.push({ label: 'Edit', icon: 'bi-pencil', action: function () { loadAssetEditForm(id); } });
      items.push({ label: 'Check Out…', icon: 'bi-person-check', action: function () { openCheckoutModal(id); } });
      items.push({ label: 'Duplicate', icon: 'bi-files', action: function () { duplicateAsset(id); } });
      items.push({ label: 'Move to…', icon: 'bi-arrows-move', action: function () { openMoveAssetModal(id); } });
      items.push({ divider: true });
      items.push({ label: 'Delete', icon: 'bi-trash', danger: true, action: function () { deleteAsset(id); } });
    }
    return items;
  }

  // Import is intentionally folder-scoped only (see openImportModal) - it
  // never appears at the top level, since a global admin import with
  // folder-path resolution lives under Settings > Import / Export instead.
  function treeBackgroundMenuItems() {
    var items = [];
    if (isAdmin) {
      items.push({ label: 'New Folder', icon: 'bi-folder-plus', action: function () { openFolderModal({ parentId: null }); } });
      items.push({ label: 'Add Asset', icon: 'bi-plus-lg', action: function () { loadAssetForm({ folderId: null }); } });
      items.push({ divider: true });
    }
    items.push({ label: 'Expand All', icon: 'bi-arrows-expand', action: expandAllHandler });
    items.push({ label: 'Collapse All', icon: 'bi-arrows-collapse', action: collapseAllHandler });
    items.push({ divider: true });
    items.push({ label: 'Export CSV', icon: 'bi-download', action: function () { window.location = '/export/assets.csv'; } });
    return items;
  }

  function panelBackgroundMenuItems(folderId) {
    var items = [];
    if (isAdmin) {
      items.push({ label: folderId ? 'New Subfolder' : 'New Folder', icon: 'bi-folder-plus', action: function () { openFolderModal({ parentId: folderId }); } });
      items.push({ label: 'Add Asset', icon: 'bi-plus-lg', action: function () { loadAssetForm({ folderId: folderId }); } });
      if (folderId) {
        items.push({ divider: true });
        items.push({ label: 'Import CSV…', icon: 'bi-upload', action: function () { openImportModal(folderId); } });
      }
    }
    var exportUrl = folderId ? ('/export/assets.csv?folder_id=' + folderId + '&recursive=1') : '/export/assets.csv';
    items.push({ divider: true });
    items.push({ label: 'Export CSV', icon: 'bi-download', action: function () { window.location = exportUrl; } });
    return items;
  }

  // ---- Wiring: tree pane -------------------------------------------------

  if (treePane) {
    treePane.addEventListener('contextmenu', function (e) {
      if (e.target.closest('input, button')) return; // let native menus work on the search box etc.
      var row = e.target.closest('.tree-row');
      if (!row || row.dataset.type === 'root') {
        e.preventDefault();
        showContextMenu(e.clientX, e.clientY, treeBackgroundMenuItems());
        return;
      }
      var type = row.dataset.type;
      if (type !== 'folder' && type !== 'asset') return; // e.g. the "N more assets" row: no menu
      e.preventDefault();
      document.querySelectorAll('.tree-row.selected').forEach(function (r) { r.classList.remove('selected'); });
      row.classList.add('selected');
      showContextMenu(e.clientX, e.clientY, type === 'folder' ? folderMenuItems(row.dataset.id) : assetMenuItems(row.dataset.id));
    });
  }

  // ---- Wiring: main panel -------------------------------------------------

  if (mainPanel) {
    mainPanel.addEventListener('contextmenu', function (e) {
      var folderLink = e.target.closest('.folder-link');
      if (folderLink) { e.preventDefault(); showContextMenu(e.clientX, e.clientY, folderMenuItems(folderLink.dataset.id)); return; }

      var assetRow = e.target.closest('.asset-link, .asset-row');
      if (assetRow) { e.preventDefault(); showContextMenu(e.clientX, e.clientY, assetMenuItems(assetRow.dataset.id)); return; }

      var assetHeader = e.target.closest('[data-context="asset-header"]');
      if (assetHeader) { e.preventDefault(); showContextMenu(e.clientX, e.clientY, assetMenuItems(assetHeader.dataset.id)); return; }

      var folderHeader = e.target.closest('[data-context="folder-header"]');
      if (folderHeader) { e.preventDefault(); showContextMenu(e.clientX, e.clientY, folderMenuItems(folderHeader.dataset.id)); return; }

      var rootCrumb = e.target.closest('.breadcrumb [data-type="root"]');
      if (rootCrumb) { e.preventDefault(); showContextMenu(e.clientX, e.clientY, panelBackgroundMenuItems(null)); return; }

      var folderCrumb = e.target.closest('.breadcrumb [data-type="folder"]');
      if (folderCrumb) { e.preventDefault(); showContextMenu(e.clientX, e.clientY, folderMenuItems(folderCrumb.dataset.id)); return; }

      if (e.target.closest('a, button, input, select, textarea, form, .list-group-item')) return;
      var panelContent = e.target.closest('.panel-content');
      var panelType = panelContent && panelContent.dataset.panelType;
      if (panelType === 'root' || panelType === 'folder') {
        e.preventDefault();
        var folderId = panelType === 'folder' ? panelContent.dataset.folderId : null;
        showContextMenu(e.clientX, e.clientY, panelBackgroundMenuItems(folderId));
      }
    });
  }

  // ---------------------------------------------------------------------
  // Icon picker: a searchable dropdown of common Bootstrap Icons standing
  // in for a free-text icon-class input (used by the folder modal and the
  // item type form).
  // ---------------------------------------------------------------------

  var COMMON_ICONS = [
    'bi-folder-fill', 'bi-folder', 'bi-archive', 'bi-box-seam', 'bi-boxes',
    'bi-laptop', 'bi-pc-display', 'bi-pc', 'bi-display', 'bi-tv', 'bi-projector',
    'bi-phone', 'bi-telephone', 'bi-tablet', 'bi-smartwatch',
    'bi-camera-video', 'bi-camera', 'bi-printer', 'bi-keyboard', 'bi-mouse',
    'bi-hdd', 'bi-hdd-rack', 'bi-hdd-stack', 'bi-server', 'bi-cpu', 'bi-memory',
    'bi-disc', 'bi-usb-drive', 'bi-usb-plug', 'bi-ethernet', 'bi-router', 'bi-wifi',
    'bi-shield-lock', 'bi-shield-check', 'bi-lock', 'bi-unlock', 'bi-plug',
    'bi-battery', 'bi-battery-charging', 'bi-gear', 'bi-gear-fill', 'bi-tools',
    'bi-wrench', 'bi-tag', 'bi-tags', 'bi-bookmark', 'bi-house-door-fill',
    'bi-building', 'bi-person', 'bi-people',
  ];

  function setIconPickerValue(input, val) {
    input.value = val || '';
    var container = input.closest('.icon-picker');
    if (!container) return;
    var preview = container.querySelector('.icon-picker-preview');
    var label = container.querySelector('.icon-picker-label');
    if (val) {
      preview.className = 'bi ' + val + ' icon-picker-preview';
      label.textContent = val;
      label.classList.remove('text-body-secondary');
    } else {
      preview.className = 'bi icon-picker-preview';
      label.textContent = 'Choose icon…';
      label.classList.add('text-body-secondary');
    }
  }

  function closeAllIconPickers() {
    document.querySelectorAll('.icon-picker-menu.show').forEach(function (m) { m.classList.remove('show'); });
  }

  function initIconPickers() {
    document.querySelectorAll('[data-icon-picker]').forEach(function (container) {
      if (container.dataset.iconPickerInit) return;
      container.dataset.iconPickerInit = '1';

      var input = container.querySelector('input[type="hidden"]');
      var toggle = container.querySelector('.icon-picker-toggle');
      var menu = container.querySelector('.icon-picker-menu');
      var search = container.querySelector('.icon-picker-search');
      var grid = container.querySelector('.icon-picker-grid');
      var clearBtn = container.querySelector('.icon-picker-clear');

      function renderGrid(filter) {
        filter = (filter || '').toLowerCase();
        var list = COMMON_ICONS.filter(function (ic) { return !filter || ic.indexOf(filter) !== -1; });
        grid.innerHTML = list.map(function (ic) {
          return '<button type="button" class="icon-picker-item" data-icon="' + ic + '" title="' + ic + '"><i class="bi ' + ic + '"></i></button>';
        }).join('') || '<div class="text-body-secondary small p-2">No matches</div>';
      }

      toggle.addEventListener('click', function (e) {
        e.stopPropagation();
        var isOpen = menu.classList.contains('show');
        closeAllIconPickers();
        if (!isOpen) {
          menu.classList.add('show');
          search.value = '';
          renderGrid('');
          search.focus();
        }
      });

      search.addEventListener('input', function () { renderGrid(search.value.trim()); });

      grid.addEventListener('click', function (e) {
        var btn = e.target.closest('.icon-picker-item');
        if (!btn) return;
        setIconPickerValue(input, btn.dataset.icon);
        menu.classList.remove('show');
      });

      if (clearBtn) {
        clearBtn.addEventListener('click', function () {
          setIconPickerValue(input, '');
          menu.classList.remove('show');
        });
      }

      renderGrid('');
      setIconPickerValue(input, input.value);
    });
  }

  document.addEventListener('click', function (e) {
    if (!e.target.closest('.icon-picker')) closeAllIconPickers();
  });

  initIconPickers();

  // ---------------------------------------------------------------------
  // Folder create / rename modal
  // ---------------------------------------------------------------------

  var folderModalEl = document.getElementById('folderModal');
  var folderModal = (folderModalEl && window.bootstrap) ? new bootstrap.Modal(folderModalEl) : null;

  function openFolderModal(opts) {
    if (!folderModal) return;
    document.getElementById('folderFormId').value = '';
    document.getElementById('folderFormParentId').value = (opts && opts.parentId) || '';
    document.getElementById('folderFormName').value = '';
    document.getElementById('folderFormDescription').value = '';
    setIconPickerValue(document.getElementById('folderFormIcon'), '');
    document.getElementById('folderFormSortOrder').value = '0';
    document.getElementById('folderModalTitle').textContent = 'New Folder';
    document.getElementById('folderFormError').classList.add('d-none');
    folderModal.show();
  }

  async function openRenameFolder(id) {
    if (!folderModal) return;
    try {
      var f = await apiFetch('/app/folders/' + id);
      document.getElementById('folderFormId').value = f.ID;
      document.getElementById('folderFormParentId').value = '';
      document.getElementById('folderFormName').value = f.Name;
      document.getElementById('folderFormDescription').value = f.Description;
      setIconPickerValue(document.getElementById('folderFormIcon'), f.Icon);
      document.getElementById('folderFormSortOrder').value = f.SortOrder;
      document.getElementById('folderModalTitle').textContent = 'Rename Folder';
      document.getElementById('folderFormError').classList.add('d-none');
      folderModal.show();
    } catch (err) {
      alert('Could not load folder: ' + err.message);
    }
  }

  var folderFormEl = document.getElementById('folderForm');
  if (folderFormEl) {
    folderFormEl.addEventListener('submit', async function (e) {
      e.preventDefault();
      var id = document.getElementById('folderFormId').value;
      var payload = {
        name: document.getElementById('folderFormName').value,
        description: document.getElementById('folderFormDescription').value,
        icon: document.getElementById('folderFormIcon').value,
        sort_order: Number(document.getElementById('folderFormSortOrder').value || 0),
      };
      var errorBox = document.getElementById('folderFormError');
      errorBox.classList.add('d-none');
      try {
        if (id) {
          await apiFetch('/app/folders/' + id, { method: 'PATCH', json: payload });
        } else {
          var parentId = document.getElementById('folderFormParentId').value;
          payload.parent_id = parentId ? Number(parentId) : null;
          await apiFetch('/app/folders', { method: 'POST', json: payload });
        }
        folderModal.hide();
        await refreshWholeTree();
        await reloadCurrentPanel();
      } catch (err) {
        errorBox.textContent = err.message;
        errorBox.classList.remove('d-none');
      }
    });
  }

  // ---------------------------------------------------------------------
  // Folder delete modal
  // ---------------------------------------------------------------------

  var deleteFolderModalEl = document.getElementById('deleteFolderModal');
  var deleteFolderModal = (deleteFolderModalEl && window.bootstrap) ? new bootstrap.Modal(deleteFolderModalEl) : null;

  async function startDeleteFolder(id) {
    if (!deleteFolderModal) return;
    try {
      var info = await apiFetch('/app/folders/' + id + '/delete-info');
      deleteFolderModalEl.dataset.folderId = id;
      document.getElementById('deleteFolderName').textContent = info.folder_name;
      var empty = info.folder_count === 0 && info.asset_count === 0;
      document.getElementById('deleteFolderEmptyNotice').classList.toggle('d-none', !empty);
      document.getElementById('deleteFolderNotEmptyNotice').classList.toggle('d-none', empty);
      if (!empty) {
        document.getElementById('deleteFolderCounts').textContent =
          info.folder_count + ' folder(s) and ' + info.asset_count + ' asset(s)';
        var sel = document.getElementById('deleteFolderDestination');
        sel.innerHTML = info.destinations.map(function (d) {
          return '<option value="' + d.id + '">' + escapeHtml(d.path) + '</option>';
        }).join('');
        document.getElementById('modeRelocate').checked = true;
      }
      deleteFolderModal.show();
    } catch (err) {
      alert('Could not load folder info: ' + err.message);
    }
  }

  var confirmDeleteFolderBtn = document.getElementById('confirmDeleteFolderBtn');
  if (confirmDeleteFolderBtn) {
    confirmDeleteFolderBtn.addEventListener('click', async function () {
      var id = deleteFolderModalEl.dataset.folderId;
      var notEmpty = !document.getElementById('deleteFolderNotEmptyNotice').classList.contains('d-none');
      var url = '/app/folders/' + id;
      if (notEmpty) {
        var mode = document.querySelector('input[name="delete_mode"]:checked').value;
        if (mode === 'cascade') {
          url += '?mode=cascade';
        } else {
          var dest = document.getElementById('deleteFolderDestination').value;
          url += '?mode=relocate&dest=' + encodeURIComponent(dest);
        }
      }
      try {
        await apiFetch(url, { method: 'DELETE' });
        deleteFolderModal.hide();
        await refreshWholeTree();
        await navigateAndSelect('root', '');
      } catch (err) {
        alert('Delete failed: ' + err.message);
      }
    });
  }

  // ---------------------------------------------------------------------
  // Move asset modal
  // ---------------------------------------------------------------------

  var moveAssetModalEl = document.getElementById('moveAssetModal');
  var moveAssetModal = (moveAssetModalEl && window.bootstrap) ? new bootstrap.Modal(moveAssetModalEl) : null;

  async function openMoveAssetModal(id) {
    if (!moveAssetModal) return;
    moveAssetModalEl.dataset.assetId = id;
    var sel = document.getElementById('moveAssetDestination');
    sel.innerHTML = '<option value="">Inventory (top level)</option>';
    try {
      var opts = await apiFetch('/app/folders/options');
      (opts || []).forEach(function (o) {
        var indent = '';
        for (var i = 0; i < o.depth; i++) indent += '&nbsp;&nbsp;&nbsp;';
        var opt = document.createElement('option');
        opt.value = o.id;
        opt.innerHTML = indent + escapeHtml(o.path);
        sel.appendChild(opt);
      });
    } catch (err) { /* fall back to top-level-only */ }
    moveAssetModal.show();
  }

  var confirmMoveAssetBtn = document.getElementById('confirmMoveAssetBtn');
  if (confirmMoveAssetBtn) {
    confirmMoveAssetBtn.addEventListener('click', async function () {
      var id = moveAssetModalEl.dataset.assetId;
      var val = document.getElementById('moveAssetDestination').value;
      try {
        await apiFetch('/app/assets/' + id + '/move', { method: 'POST', json: { folder_id: val ? Number(val) : null } });
        moveAssetModal.hide();
        await refreshWholeTree();
        await navigateAndSelect('asset', id);
      } catch (err) {
        alert('Move failed: ' + err.message);
      }
    });
  }

  // ---------------------------------------------------------------------
  // Check out / check in modal
  // ---------------------------------------------------------------------

  var checkoutModalEl = document.getElementById('checkoutModal');
  var checkoutModal = (checkoutModalEl && window.bootstrap) ? new bootstrap.Modal(checkoutModalEl) : null;

  async function openCheckoutModal(id) {
    if (!checkoutModal) return;
    checkoutModalEl.dataset.assetId = id;
    var sel = document.getElementById('checkoutUserSelect');
    var currentText = document.getElementById('checkoutCurrent');
    sel.innerHTML = '<option value="">Unassigned (check in)</option>';
    currentText.textContent = 'Loading…';
    try {
      var asset = await apiFetch('/app/assets/' + id);
      var users = await apiFetch('/app/users/options');
      (users || []).forEach(function (u) {
        var opt = document.createElement('option');
        opt.value = u.id;
        opt.textContent = u.username;
        if (asset.AssignedUserID === u.id) opt.selected = true;
        sel.appendChild(opt);
      });
      currentText.textContent = asset.AssignedUsername
        ? 'Currently checked out to ' + asset.AssignedUsername + '.'
        : 'Not currently checked out to anyone.';
      document.getElementById('checkoutModalTitle').textContent = 'Check Out "' + asset.Name + '"';
    } catch (err) {
      currentText.textContent = '';
    }
    checkoutModal.show();
  }

  var confirmCheckoutBtn = document.getElementById('confirmCheckoutBtn');
  if (confirmCheckoutBtn) {
    confirmCheckoutBtn.addEventListener('click', async function () {
      var id = checkoutModalEl.dataset.assetId;
      var val = document.getElementById('checkoutUserSelect').value;
      try {
        await apiFetch('/app/assets/' + id + '/checkout', { method: 'POST', json: { assigned_user_id: val ? Number(val) : null } });
        checkoutModal.hide();
        await navigateAndSelect('asset', id);
      } catch (err) {
        alert('Checkout failed: ' + err.message);
      }
    });
  }

  // ---------------------------------------------------------------------
  // Asset form (create / edit) - shown in a modal
  // ---------------------------------------------------------------------

  var assetModalEl = document.getElementById('assetModal');
  var assetModal = (assetModalEl && window.bootstrap) ? new bootstrap.Modal(assetModalEl) : null;

  function showAssetModal(html) {
    if (!assetModal) return;
    document.getElementById('assetModalBody').innerHTML = html;
    var form = document.getElementById('assetForm');
    document.getElementById('assetModalTitle').textContent = form.dataset.title;
    document.getElementById('assetModalSubmit').textContent = form.dataset.mode === 'edit' ? 'Save Changes' : 'Create Asset';
    assetModal.show();
  }

  async function loadAssetForm(opts) {
    var params = new URLSearchParams();
    if (opts && opts.folderId) params.set('folder_id', opts.folderId);
    var qs = params.toString();
    var html = await fetchText('/app/panel/assets/new' + (qs ? '?' + qs : ''));
    showAssetModal(html);
  }

  async function loadAssetEditForm(id) {
    var html = await fetchText('/app/panel/assets/' + id + '/edit');
    showAssetModal(html);
  }

  async function submitAssetForm(form) {
    var errorBox = document.getElementById('assetFormError');
    errorBox.classList.add('d-none');
    var fd = new FormData(form);
    var payload = { fields: {} };
    for (var pair of fd.entries()) {
      var key = pair[0], value = pair[1];
      if (key.indexOf('field_') === 0) {
        payload.fields[key.slice(6)] = value;
      } else if (key === 'item_type_id') {
        payload.item_type_id = Number(value);
      } else if (key === 'folder_id') {
        payload.folder_id = value ? Number(value) : null;
      } else if (key === 'status_id') {
        payload.status_id = Number(value);
      } else if (key === 'assigned_user_id') {
        payload.assigned_user_id = value ? Number(value) : null;
      } else if (key === 'quantity') {
        payload.quantity = Number(value) || 0;
      } else {
        payload[key] = value;
      }
    }
    var mode = form.dataset.mode;
    var url = mode === 'edit' ? '/app/assets/' + form.dataset.assetId : '/app/assets';
    var method = mode === 'edit' ? 'PATCH' : 'POST';
    try {
      var res = await apiFetch(url, { method: method, json: payload });
      if (assetModal) assetModal.hide();
      await refreshWholeTree();
      await navigateAndSelect('asset', res.id);
    } catch (err) {
      errorBox.textContent = err.message;
      errorBox.classList.remove('d-none');
    }
  }

  async function duplicateAsset(id) {
    try {
      var res = await apiFetch('/app/assets/' + id + '/duplicate', { method: 'POST' });
      await refreshWholeTree();
      await navigateAndSelect('asset', res.id);
    } catch (err) {
      alert('Duplicate failed: ' + err.message);
    }
  }

  async function deleteAsset(id) {
    if (!confirm('Delete this asset? This cannot be undone.')) return;
    try {
      var res = await apiFetch('/app/assets/' + id, { method: 'DELETE' });
      await refreshWholeTree();
      if (res.folder_id) await navigateAndSelect('folder', res.folder_id);
      else await navigateAndSelect('root', '');
    } catch (err) {
      alert('Delete failed: ' + err.message);
    }
  }

  // adjustAssetQuantity handles the +/- steppers shown next to non-unique
  // assets (in the asset detail panel and folder asset tables), updating
  // the displayed number in place without reloading the whole panel.
  async function adjustAssetQuantity(stepBtn) {
    var wrapper = stepBtn.closest('[data-quantity-stepper]');
    if (!wrapper) return;
    var id = wrapper.dataset.assetId;
    var valueEl = wrapper.querySelector('[data-quantity-value]');
    var delta = parseInt(stepBtn.dataset.step, 10) || 0;
    try {
      var res = await apiFetch('/app/assets/' + id + '/quantity', { method: 'POST', json: { delta: delta } });
      if (valueEl) valueEl.textContent = res.quantity;
    } catch (err) {
      alert('Could not update quantity: ' + err.message);
    }
  }

  // ---------------------------------------------------------------------
  // Folder listing filters / pagination
  // ---------------------------------------------------------------------

  async function loadFolderPanelWithFilters(folderId, overrides) {
    var form = mainPanel.querySelector('.panel-filter-form');
    var params = new URLSearchParams();
    if (form) {
      var fd = new FormData(form);
      for (var pair of fd.entries()) {
        if (pair[1]) params.set(pair[0], pair[1]);
      }
    }
    if (overrides) {
      for (var k in overrides) params.set(k, overrides[k]);
    }
    var qs = params.toString();
    var html = await fetchText('/app/panel/folders/' + folderId + (qs ? '?' + qs : ''));
    mainPanel.innerHTML = html;
    mainPanel.dataset.contextType = 'folder';
    mainPanel.dataset.contextId = folderId;
  }

  // ---------------------------------------------------------------------
  // Search
  // ---------------------------------------------------------------------

  async function runSearch(q) {
    if (!q || !q.trim()) return;
    var html = await fetchText('/app/search?q=' + encodeURIComponent(q));
    mainPanel.innerHTML = html;
    mainPanel.dataset.contextType = 'search';
    mainPanel.dataset.contextId = '';
    document.querySelectorAll('.tree-row.selected').forEach(function (r) { r.classList.remove('selected'); });
  }

  var treeSearchEl = document.getElementById('tree-search');
  if (treeSearchEl) {
    var searchDebounce;
    treeSearchEl.addEventListener('keydown', function (e) {
      if (e.key === 'Enter') {
        e.preventDefault();
        runSearch(treeSearchEl.value);
      }
    });
    treeSearchEl.addEventListener('input', function () {
      clearTimeout(searchDebounce);
      var q = treeSearchEl.value;
      if (!q) return;
      searchDebounce = setTimeout(function () { runSearch(q); }, 400);
    });
  }

  // ---------------------------------------------------------------------
  // CSV import
  // ---------------------------------------------------------------------

  var importModalEl = document.getElementById('importModal');
  var importModal = (importModalEl && window.bootstrap) ? new bootstrap.Modal(importModalEl) : null;

  function openImportModal(folderId) {
    if (!importModal) return;
    document.getElementById('importFolderId').value = folderId || '';
    document.getElementById('importResult').innerHTML = '';
    var fileInput = document.getElementById('importFile');
    if (fileInput) fileInput.value = '';
    importModal.show();
  }

  var importFormEl = document.getElementById('importForm');
  if (importFormEl) {
    importFormEl.addEventListener('submit', async function (e) {
      e.preventDefault();
      var resultBox = document.getElementById('importResult');
      resultBox.innerHTML = '<div class="text-body-secondary">Importing&hellip;</div>';
      var fd = new FormData(importFormEl);
      try {
        var res = await fetch('/import/assets.csv', { method: 'POST', body: fd });
        var body = await res.json();
        if (!res.ok || !body.ok) throw new Error(body.error || 'Import failed');
        var data = body.data;
        var html = '<div class="alert alert-success py-2">Created ' + data.Created + ', updated ' + data.Updated + '.</div>';
        if (data.Errors && data.Errors.length) {
          html += '<div class="alert alert-warning py-2"><strong>' + data.Errors.length + ' note(s):</strong><ul class="mb-0">' +
            data.Errors.map(function (m) { return '<li>' + escapeHtml(m) + '</li>'; }).join('') + '</ul></div>';
        }
        resultBox.innerHTML = html;
        await refreshWholeTree();
        await reloadCurrentPanel();
      } catch (err) {
        resultBox.innerHTML = '<div class="alert alert-danger py-2">' + escapeHtml(err.message) + '</div>';
      }
    });
  }

  // ---------------------------------------------------------------------
  // Tree pane: click + drag/drop delegation
  // ---------------------------------------------------------------------

  if (treePane) {
    treePane.addEventListener('click', function (e) {
      if (e.target.closest('#btn-expand-all')) { expandAllHandler(); return; }
      if (e.target.closest('#btn-collapse-all')) { collapseAllHandler(); return; }

      var toggle = e.target.closest('.tree-toggle');
      if (toggle) { e.stopPropagation(); toggleFolder(toggle); return; }

      var row = e.target.closest('.tree-row');
      if (row && row.dataset.type && !row.classList.contains('tree-row-more')) {
        selectNode(row);
      }
    });

    // Drag and drop (admin only)
    treePane.addEventListener('dragstart', function (e) {
      if (!isAdmin) { e.preventDefault(); return; }
      var li = e.target.closest('.tree-node[draggable="true"]');
      if (!li) return;
      draggedNode = { type: li.dataset.type, id: li.dataset.id };
      li.classList.add('dragging');
      e.dataTransfer.effectAllowed = 'move';
      e.dataTransfer.setData('text/plain', draggedNode.type + ':' + draggedNode.id);
    });

    treePane.addEventListener('dragend', function () {
      document.querySelectorAll('.tree-node.dragging').forEach(function (n) { n.classList.remove('dragging'); });
      document.querySelectorAll('.tree-row.drop-target').forEach(function (n) { n.classList.remove('drop-target'); });
      draggedNode = null;
    });

    treePane.addEventListener('dragover', function (e) {
      if (!draggedNode) return;
      var row = e.target.closest('.tree-row');
      if (!row) return;
      var type = row.dataset.type;
      if (type !== 'folder' && type !== 'root') return;
      if (type === 'folder' && draggedNode.type === 'folder' && draggedNode.id === row.dataset.id) return;
      e.preventDefault();
      e.dataTransfer.dropEffect = 'move';
      row.classList.add('drop-target');
    });

    treePane.addEventListener('dragleave', function (e) {
      var row = e.target.closest('.tree-row');
      if (row) row.classList.remove('drop-target');
    });

    treePane.addEventListener('drop', async function (e) {
      if (!draggedNode) return;
      var row = e.target.closest('.tree-row');
      if (!row) return;
      var type = row.dataset.type;
      if (type !== 'folder' && type !== 'root') return;
      e.preventDefault();
      row.classList.remove('drop-target');
      var destId = type === 'root' ? null : Number(row.dataset.id);
      var dragged = draggedNode;
      draggedNode = null;
      try {
        if (dragged.type === 'folder') {
          await apiFetch('/app/folders/' + dragged.id + '/move', { method: 'POST', json: { parent_id: destId } });
        } else if (dragged.type === 'asset') {
          await apiFetch('/app/assets/' + dragged.id + '/move', { method: 'POST', json: { folder_id: destId } });
        }
        await refreshWholeTree();
        await reloadCurrentPanel();
      } catch (err) {
        alert('Move failed: ' + err.message);
      }
    });
  }

  // ---------------------------------------------------------------------
  // Main panel: click / change / submit delegation
  // ---------------------------------------------------------------------

  if (mainPanel) {
    mainPanel.addEventListener('click', function (e) {
      var stepBtn = e.target.closest('[data-action="panel-quantity-step"], [data-action="table-quantity-step"]');
      if (stepBtn) { e.preventDefault(); e.stopPropagation(); adjustAssetQuantity(stepBtn); return; }

      var folderLink = e.target.closest('.folder-link');
      if (folderLink) { e.preventDefault(); navigateAndSelect('folder', folderLink.dataset.id); return; }

      var assetLink = e.target.closest('.asset-link, .asset-row');
      if (assetLink) { e.preventDefault(); navigateAndSelect('asset', assetLink.dataset.id); return; }

      var crumb = e.target.closest('.breadcrumb-link');
      if (crumb) { e.preventDefault(); navigateAndSelect(crumb.dataset.type, crumb.dataset.id || ''); return; }

      var pageLink = e.target.closest('.panel-page-link');
      if (pageLink) { e.preventDefault(); loadFolderPanelWithFilters(pageLink.dataset.folderId, { page: pageLink.dataset.page }); return; }
    });

    mainPanel.addEventListener('change', function (e) {
      var filterForm = e.target.closest('.panel-filter-form');
      if (filterForm) {
        loadFolderPanelWithFilters(filterForm.dataset.folderId, { page: 1 });
      }
    });

    var filterDebounce;
    mainPanel.addEventListener('input', function (e) {
      if (e.target.matches && e.target.matches('.panel-filter-form input[name="q"]')) {
        clearTimeout(filterDebounce);
        var form = e.target.closest('.panel-filter-form');
        filterDebounce = setTimeout(function () { loadFolderPanelWithFilters(form.dataset.folderId, { page: 1 }); }, 350);
      }
    });

    mainPanel.addEventListener('submit', function (e) {
      if (e.target.matches && e.target.matches('.panel-filter-form')) {
        e.preventDefault();
        loadFolderPanelWithFilters(e.target.dataset.folderId, { page: 1 });
      }
    });

    // Draggable rows within the panel (subfolder list / asset tables) drop
    // onto the tree only; the tree pane is the primary drag surface.
  }

  // The asset create/edit form lives inside #assetModal (injected fresh
  // each time it's opened), so its dynamic bits are delegated from the
  // modal element itself rather than from #main-panel.
  if (assetModalEl) {
    assetModalEl.addEventListener('change', async function (e) {
      if (e.target.id === 'assetFormItemType') {
        var html = await fetchText('/app/forms/asset-fields?item_type_id=' + e.target.value);
        var container = document.getElementById('asset-fields-container');
        if (container) container.innerHTML = html;
      }
    });
    assetModalEl.addEventListener('submit', function (e) {
      if (e.target.id === 'assetForm') {
        e.preventDefault();
        submitAssetForm(e.target);
      }
    });
    assetModalEl.addEventListener('click', function (e) {
      var stepBtn = e.target.closest('[data-action="quantity-step"]');
      if (!stepBtn) return;
      var input = document.getElementById('assetFormQuantity');
      if (!input) return;
      var next = (parseInt(input.value, 10) || 0) + parseInt(stepBtn.dataset.step, 10);
      input.value = Math.max(0, next);
    });
  }

  // ---------------------------------------------------------------------
  // Item type custom field admin form (item-types/{id}/edit page)
  // ---------------------------------------------------------------------

  var fieldForm = document.getElementById('fieldForm');
  if (fieldForm) {
    document.addEventListener('click', function (e) {
      var editBtn = e.target.closest('.field-edit-btn');
      if (editBtn) {
        document.getElementById('fieldFormTitle').textContent = 'Edit Field';
        document.getElementById('fieldFormName').value = editBtn.dataset.name;
        document.getElementById('fieldFormType').value = editBtn.dataset.type;
        document.getElementById('fieldFormDefault').value = editBtn.dataset.default;
        document.getElementById('fieldFormOptions').value = editBtn.dataset.options || '';
        document.getElementById('fieldFormRequired').checked = editBtn.dataset.required === 'true';
        document.getElementById('fieldFormSortOrder').value = editBtn.dataset.sortOrder;
        document.getElementById('fieldFormSubmit').textContent = 'Save';
        fieldForm.action = window.itemTypeFieldsBaseAction + '/' + editBtn.dataset.id;
        var cancelBtn = document.getElementById('fieldFormCancel');
        cancelBtn.classList.remove('d-none');
        fieldForm.scrollIntoView({ behavior: 'smooth', block: 'center' });
        return;
      }
      var cancelBtn2 = e.target.closest('#fieldFormCancel');
      if (cancelBtn2) {
        document.getElementById('fieldFormTitle').textContent = 'Add Field';
        fieldForm.reset();
        document.getElementById('fieldFormSubmit').textContent = 'Add';
        fieldForm.action = window.itemTypeFieldsBaseAction;
        cancelBtn2.classList.add('d-none');
      }
    });
  }

  // ---------------------------------------------------------------------
  // QR/barcode scan landing: /scan/<tag> redirects here with ?asset=<id>
  // (or ?scan_error=<tag> if the tag didn't match anything).
  // ---------------------------------------------------------------------

  var inventoryShell = document.querySelector('.inventory-shell');
  if (inventoryShell) {
    var autoOpenId = inventoryShell.dataset.autoOpenAsset;
    if (autoOpenId) {
      navigateAndSelect('asset', autoOpenId);
    }
    var scanError = inventoryShell.dataset.scanError;
    if (scanError) {
      alert('No asset found for scanned tag "' + scanError + '".');
    }
    if (autoOpenId || scanError) {
      // Drop the query string so a page refresh doesn't re-trigger this.
      window.history.replaceState({}, '', '/inventory');
    }
  }
})();