import { useConfirm } from "@/components/surface/surface-scope";
import { useHostSpeedSearch } from "./hooks/useHostSpeedSearch";
import {
  useCallback,
  useEffect,
  useMemo,
  useRef,
  useLayoutEffect,
  useState,
} from "react";
import { updatePluginHostSettings } from "@/api/plugins-api";
import { resetHostToDefaults } from "@/api/host-defaults-api";
import { PluginIcon } from "@/lib/plugin-icon";
import { pluginName } from "@/lib/plugin-i18n";
import { usePluginHostSections } from "@/settings/HostPluginSections";
import { useTranslation } from "react-i18next";
import { useVirtualizer } from "@tanstack/react-virtual";
import { useAreaPreferences } from "@/contexts/UiPreferencesContext";
import {
  ChevronDown,
  Download,
  FolderOpen,
  Loader2,
  Plus,
  RotateCcw,
  Server,
  Terminal,
} from "lucide-react";
import { Button } from "@/components/button";
import { EmptyState } from "@/components/empty-state";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@/components/dropdown-menu";
import { toast } from "sonner";
import {
  bulkUpdateSSHHosts,
  createSSHHost,
  deleteSSHHost,
  renameFolder,
  updateFolderMetadata,
  deleteAllHostsInFolder,
  reorderSSHHosts,
  reorderFolders,
} from "@/main-axios";
import { planReorder, renumberSiblings } from "@/sidebar/reorder-utils";
import type { Host, HostFolder, TabType } from "@/types/ui-types";
import type { SSHHostData } from "@/types/index";
import type {
  HostDensity,
  HostClickBehavior,
  HostRowFields,
  HostTrayTrigger,
} from "@/types/host-sidebar-preferences";
import { resolveHostTabType } from "@/lib/host-connection-tabs";
import { canEditHost } from "@/sidebar/host-permissions";
import { FolderMetadataDialog } from "@/sidebar/FolderMetadataDialog";
import { HostShareModal } from "@/sidebar/HostShareModal";
import { HostItem } from "./HostItem/HostItem";
import { FolderItem, folderHostCount } from "./FolderItem/FolderItem";
import {
  isFolder,
  collectVisibleRows,
  collectAllHosts,
  collectAllFolderPaths,
  hostExpandKey,
  hostMatchesQuery,
  buildReorderRows,
  collectOrderableRows,
  rowKey,
  rowKind,
  ROOT_PARENT,
} from "./visible-rows";
import { RESOURCE_ROW_EXTRA, rendersResourceRow } from "./row-metrics";
import { ReorderIndicator } from "@/sidebar/ReorderIndicator";
import { useSidebarSelection } from "./hooks/useSidebarSelection";
import { useSidebarDragState } from "./hooks/useSidebarDragState";

export function SidebarTree({
  children,
  onOpenTab: openTab,
  onEditHost,
  onShareHost,
  query: externalQuery = "",
  selectionMode,
  onToggleSelectionMode,
  loading = false,
  onExportSelected,
  arrangeLocked = true,
  density = "comfortable",
  trayTrigger = "hover",
  showTags = true,
  openOnDoubleClick = false,
  showFolderPaths = true,
  hostClickBehavior = "newTab",
  rowFields,
}: {
  children: (Host | HostFolder)[];
  onOpenTab: (
    host: Host,
    type: TabType,
    options?: {
      data?: Record<string, unknown>;
      label?: string;
      forceNewTab?: boolean;
    },
  ) => void;
  onEditHost: (host: Host) => void;
  onShareHost?: (host: Host) => void;
  query?: string;
  selectionMode: boolean;
  onToggleSelectionMode: () => void;
  loading?: boolean;
  onExportSelected?: (hostIds: string[]) => void;
  /** When true, drag-to-rearrange is off entirely. Toggled from the panel header. */
  arrangeLocked?: boolean;
  density?: HostDensity;
  trayTrigger?: HostTrayTrigger;
  showTags?: boolean;
  openOnDoubleClick?: boolean;
  /** When false, nested folders hide the parent-path breadcrumb before their name. */
  showFolderPaths?: boolean;
  hostClickBehavior?: HostClickBehavior;
  rowFields?: HostRowFields;
}) {
  const { t } = useTranslation();
  const rootRef = useRef<HTMLDivElement>(null);
  // Focus left on the clicked row sends the next keys to the host speed
  // search instead of the session that just opened.
  const onOpenTab: typeof openTab = (...args) => {
    const active = document.activeElement;
    if (active instanceof HTMLElement && rootRef.current?.contains(active)) {
      active.blur();
    }
    openTab(...args);
  };
  const hostSettingPlugins = usePluginHostSections();
  const hostSwitchPlugins = hostSettingPlugins.filter(
    (plugin) => !!plugin.contributes?.settings?.host?.enableKey,
  );
  // Knobs with no other owner come straight from the interface preset; the
  // ones above still come from the host sidebar preferences blob.
  const { showResourceBars, showStatusStripes, rowActions } =
    useAreaPreferences("hostList");
  const [openFolders, setOpenFolders] = useState<Set<string>>(() => {
    try {
      const saved = localStorage.getItem("hostOpenFolders");
      return saved ? new Set<string>(JSON.parse(saved)) : new Set();
    } catch {
      return new Set();
    }
  });
  // Sub-host parents default to expanded (unlike folders, which default
  // collapsed) -- a host reparented under another shouldn't seem to vanish
  // just because its new parent row starts closed. This tracks the opposite:
  // parents the user has explicitly collapsed.
  const [closedHostParents, setClosedHostParents] = useState<Set<string>>(
    () => {
      try {
        const saved = localStorage.getItem("hostClosedParents");
        return saved ? new Set<string>(JSON.parse(saved)) : new Set();
      } catch {
        return new Set();
      }
    },
  );
  function toggleHostParent(key: string) {
    setClosedHostParents((prev) => {
      const next = new Set(prev);
      if (next.has(key)) next.delete(key);
      else next.add(key);
      persistClosedHostParents(next);
      return next;
    });
  }
  const {
    selectedHostIds,
    setSelectedHostIds,
    openMenuHostId,
    setOpenMenuHostId,
    openTrayHostId,
    setOpenTrayHostId,
    hoveredHostId,
    setHoveredHostId,
    toggleSelect,
    toggleSelectMany,
  } = useSidebarSelection();
  // Selection mode can be toggled off from outside this component (e.g. the
  // topbar button in HostsPanel), which has no way to reach into this
  // component's own selectedHostIds state -- clear it here instead so stale
  // selections don't stay visually highlighted after leaving selection mode.
  useEffect(() => {
    if (!selectionMode) setSelectedHostIds(new Set());
  }, [selectionMode, setSelectedHostIds]);
  const confirm = useConfirm();
  const setConfirmDialog = (
    request: { message: string; onConfirm: () => Promise<void> | void } | null,
  ) => {
    if (!request) return;
    void confirm({ title: request.message }).then((ok) => {
      if (ok) void request.onConfirm();
    });
  };
  const { draggedHostIds, setDraggedHostIds, rootDragOver, setRootDragOver } =
    useSidebarDragState();
  const [folderDialog, setFolderDialog] = useState<{
    mode: "create" | "edit";
    folder?: HostFolder;
  } | null>(null);
  const [shareFolderTarget, setShareFolderTarget] = useState<string | null>(
    null,
  );
  // Tracks the single item being dragged in manual sort mode, separate from
  // draggedHostIds (which drives multi-select folder-assignment drops).
  const [draggedReorderKey, setDraggedReorderKey] = useState<string | null>(
    null,
  );
  // Tracks which single row is currently the drop target during a manual
  // reorder drag, lifted here (rather than local state per row) so only one
  // row can ever show the drop-indicator bar at a time -- per-row local
  // state could get stuck showing a stale bar when the pointer jumped
  // directly from one virtualized row to another without a clean
  // dragleave firing on the row being left.
  const [reorderHoverKey, setReorderHoverKey] = useState<string | null>(null);
  const [reorderHoverEdge, setReorderHoverEdge] = useState<
    "before" | "after" | null
  >(null);
  // Gated on the lock alone. Unlocking also switches the panel to manual
  // sort, but that write lands separately -- requiring it here meant the
  // unlock did nothing until the sort state caught up.
  const arrangeMode = !arrangeLocked;

  const hostsById = useMemo(() => {
    const map = new Map<string, Host>();
    for (const host of collectAllHosts(children)) map.set(host.id, host);
    return map;
  }, [children]);

  function handleDragHostStart(hostId: string) {
    // When the dragged host is part of an active selection, move the whole set.
    if (selectionMode && selectedHostIds.has(hostId)) {
      setDraggedHostIds([...selectedHostIds]);
    } else {
      setDraggedHostIds([hostId]);
    }
  }

  async function handleMoveHostsToFolder(
    hostIds: string[],
    targetPath: string,
  ) {
    setDraggedHostIds(null);
    // A selection can mix owned hosts with shared ones the recipient may not
    // edit; moving those would fail server-side and take the whole batch down.
    const movableIds = hostIds.filter((id) => {
      const host = hostsById.get(id);
      return !host || canEditHost(host);
    });
    if (movableIds.length === 0) return;

    // Folders only exist visibly via an sshFolders metadata row or by having
    // hosts in them (see buildHostTree in AppShell.tsx). A folder that was
    // never explicitly created and loses its last host here would otherwise
    // vanish with no trace the moment this move lands -- persist it first so
    // it stays visible-but-empty until the user explicitly deletes it.
    const sourceFolders = new Set(
      movableIds
        .map((id) => hostsById.get(id)?.folder)
        .filter((f): f is string => !!f && f !== targetPath),
    );
    const emptiedFolders = [...sourceFolders].filter((path) => {
      const remaining = collectAllHosts(children).filter(
        (h) => h.folder === path && !movableIds.includes(h.id),
      );
      return remaining.length === 0;
    });

    try {
      await bulkUpdateSSHHosts(movableIds.map(Number), { folder: targetPath });
      await Promise.all(
        emptiedFolders.map((path) =>
          updateFolderMetadata(path).catch(() => {
            /* best-effort; worst case the folder disappears as before */
          }),
        ),
      );
      window.dispatchEvent(new CustomEvent("termix:hosts-changed"));
      toast.success(
        t("hosts.movedToFolder", {
          count: movableIds.length,
          folder: targetPath || t("hosts.folderPickerNone"),
        }),
      );
    } catch {
      toast.error(t("hosts.failedToMoveHosts"));
    }
  }

  function isDescendantOfDragged(candidateId: string, draggedIds: string[]) {
    let current: string | null | undefined = candidateId;
    const visited = new Set<string>();
    while (current) {
      if (draggedIds.includes(current)) return true;
      if (visited.has(current)) return false;
      visited.add(current);
      current = hostsById.get(current)?.parentHostId;
    }
    return false;
  }

  async function handleMoveHostsToParent(hostIds: string[], parentId: string) {
    setDraggedHostIds(null);
    const movableIds = hostIds.filter((id) => {
      const host = hostsById.get(id);
      return !host || canEditHost(host);
    });
    if (movableIds.length === 0) return;
    if (movableIds.includes(parentId)) return;
    // A host can't become its own descendant's child -- guard client-side so
    // the drop just silently no-ops rather than round-tripping to the
    // backend's own cycle rejection.
    if (isDescendantOfDragged(parentId, movableIds)) {
      toast.error(t("hosts.cannotNestUnderDescendant"));
      return;
    }

    try {
      await bulkUpdateSSHHosts(movableIds.map(Number), {
        parentHostId: Number(parentId),
      });
      window.dispatchEvent(new CustomEvent("termix:hosts-changed"));
      const parentHost = hostsById.get(parentId);
      toast.success(
        t("hosts.movedToParent", {
          count: movableIds.length,
          parent: parentHost?.name ?? parentId,
        }),
      );
    } catch {
      toast.error(t("hosts.failedToMoveHosts"));
    }
  }

  /**
   * Resolves a drop into position and (when the drop crossed into another
   * folder) a folder move, then writes both. Siblings are scoped to the drop
   * target's own folder rather than every row of the same type -- comparing
   * against unrelated neighbours in other folders produced sort orders that
   * put the row nowhere near where it was dropped.
   */
  async function handleReorderDrop(
    targetKey: string,
    position: "before" | "after",
  ) {
    const draggedKey = draggedReorderKey;
    setDraggedReorderKey(null);
    setReorderHoverKey(null);
    setReorderHoverEdge(null);
    if (!draggedKey) return;

    const [draggedType] = draggedKey.split(":", 2);
    const [targetType] = targetKey.split(":", 2);

    // A host dropped on a folder header has no neighbour to position
    // against, so it lands at the end of that folder. It still needs an
    // explicit sortOrder: a null one sorts last in manual mode and then
    // falls back to alphabetical, losing the placement entirely.
    if (draggedType === "host" && targetType === "folder") {
      const draggedId = draggedKey.slice("host:".length);
      const folderPath = targetKey.slice("folder:".length);
      if (folderPath.startsWith("__group__:")) return;

      const host = hostsById.get(draggedId);
      if (host && !canEditHost(host)) {
        toast.error(t("hosts.failedToMoveHosts"));
        return;
      }

      const destination = collectAllHosts(children).filter(
        (h) => h.folder === folderPath && h.id !== draggedId,
      );
      const ordered = [
        ...destination.filter((h) => h.sortOrder != null),
        ...destination.filter((h) => h.sortOrder == null),
      ];

      try {
        await bulkUpdateSSHHosts([Number(draggedId)], {
          folder: folderPath,
          parentHostId: null,
        });
        await reorderSSHHosts(
          renumberSiblings([...ordered, { id: draggedId }]).map((r) => ({
            id: Number(r.id),
            sortOrder: r.sortOrder,
          })),
        );
        window.dispatchEvent(new CustomEvent("termix:hosts-changed"));
      } catch {
        toast.error(t("hosts.failedToMoveHosts"));
      }
      return;
    }
    if (draggedType !== targetType) return;

    // Built from the whole tree, not visibleRows: a collapsed destination
    // folder contributes no visible rows, so planning off the rendered list
    // compared against a partial sibling group and only landed correctly on
    // a second drop.
    const rows = buildReorderRows(collectOrderableRows(children)).filter(
      (r) => rowKind(r.key) === draggedType,
    );
    const plan = planReorder(rows, draggedKey, targetKey, position);
    if (!plan) return;

    const draggedId = draggedKey.slice(draggedKey.indexOf(":") + 1);

    try {
      if (draggedType === "host") {
        // A cross-folder drop has to move the host as well as position it,
        // otherwise it snaps back to its old folder on the next refresh.
        if (plan.movedTo !== null) {
          const host = hostsById.get(draggedId);
          if (host && !canEditHost(host)) {
            toast.error(t("hosts.failedToMoveHosts"));
            return;
          }
          // movedTo is a parent KEY ("folder:Homelab" / "host:11" / the root
          // sentinel), not a folder path -- writing it raw created folders
          // literally named "folder:Homelab".
          if (plan.movedTo === ROOT_PARENT) {
            await bulkUpdateSSHHosts([Number(draggedId)], {
              folder: "",
              parentHostId: null,
            });
          } else if (plan.movedTo.startsWith("folder:")) {
            await bulkUpdateSSHHosts([Number(draggedId)], {
              folder: plan.movedTo.slice("folder:".length),
              parentHostId: null,
            });
          } else {
            await bulkUpdateSSHHosts([Number(draggedId)], {
              folder: "",
              parentHostId: Number(plan.movedTo.slice("host:".length)),
            });
          }
        }
        await reorderSSHHosts(
          plan.positions.map((pos) => ({
            id: Number(pos.key.slice(pos.key.indexOf(":") + 1)),
            sortOrder: pos.sortOrder,
          })),
        );
      } else {
        await reorderFolders(
          plan.positions.map((pos) => ({
            name: pos.key.slice(pos.key.indexOf(":") + 1),
            sortOrder: pos.sortOrder,
          })),
        );
      }
      window.dispatchEvent(new CustomEvent("termix:hosts-changed"));
    } catch {
      toast.error(t("hosts.failedToReorder"));
    }
  }

  function handleManageFolder(folder: HostFolder) {
    setFolderDialog({ mode: "edit", folder });
  }

  function handleOpenAllSessions(folder: HostFolder) {
    const hosts = collectAllHosts(folder.children);
    for (const host of hosts) {
      const type = resolveHostTabType(host);
      if (type) onOpenTab(host, type);
    }
  }

  async function handleSaveFolderMetadata(value: {
    name: string;
    color: string;
    icon: string;
    credentialId: number | null;
    localOnly: boolean;
  }) {
    const existing = folderDialog?.folder;
    try {
      if (existing) {
        const oldPath = existing.path ?? existing.name;
        const parent = oldPath.includes(" / ")
          ? oldPath.slice(0, oldPath.lastIndexOf(" / "))
          : "";
        const newPath = parent ? `${parent} / ${value.name}` : value.name;
        if (newPath !== oldPath) {
          await renameFolder(oldPath, newPath);
        }
        await updateFolderMetadata(
          newPath,
          value.color,
          value.icon,
          value.credentialId,
          value.localOnly,
        );
      } else {
        await updateFolderMetadata(
          value.name,
          value.color,
          value.icon,
          value.credentialId,
          value.localOnly,
        );
      }
      window.dispatchEvent(new CustomEvent("termix:hosts-changed"));
      toast.success(t("hosts.folderSaved"));
    } catch {
      toast.error(t("hosts.failedToSaveFolder"));
    }
  }

  function handleDeleteFolder(folder: HostFolder) {
    const folderPath = folder.path ?? folder.name;
    const total = folderHostCount(folder);
    setConfirmDialog({
      message: t("hosts.deleteFolderConfirm", {
        name: folder.name,
        count: total,
      }),
      onConfirm: async () => {
        try {
          await deleteAllHostsInFolder(folderPath);
          window.dispatchEvent(new CustomEvent("termix:hosts-changed"));
          toast.success(t("hosts.folderDeleted", { name: folder.name }));
        } catch {
          toast.error(t("hosts.failedToDeleteFolder"));
        }
      },
    });
  }

  useEffect(() => {
    const openCreate = () => setFolderDialog({ mode: "create" });
    const expandAll = () => {
      const next = new Set(collectAllFolderPaths(children));
      persistOpenFolders(next);
      setOpenFolders(next);
      persistClosedHostParents(new Set());
      setClosedHostParents(new Set());
    };
    const collapseAll = () => {
      const next = new Set<string>();
      persistOpenFolders(next);
      setOpenFolders(next);
      const closedHosts = new Set(
        collectAllHosts(children)
          .filter((h) => h.childHosts && h.childHosts.length > 0)
          .map((h) => hostExpandKey(h)),
      );
      persistClosedHostParents(closedHosts);
      setClosedHostParents(closedHosts);
    };
    window.addEventListener("hosts:create-folder", openCreate);
    window.addEventListener("hosts:expand-all", expandAll);
    window.addEventListener("hosts:collapse-all", collapseAll);
    return () => {
      window.removeEventListener("hosts:create-folder", openCreate);
      window.removeEventListener("hosts:expand-all", expandAll);
      window.removeEventListener("hosts:collapse-all", collapseAll);
    };
  }, [children]);

  function persistOpenFolders(next: Set<string>) {
    try {
      localStorage.setItem("hostOpenFolders", JSON.stringify([...next]));
    } catch {
      // ignore quota/serialization failures
    }
  }

  function persistClosedHostParents(next: Set<string>) {
    try {
      localStorage.setItem("hostClosedParents", JSON.stringify([...next]));
    } catch {
      // ignore quota/serialization failures
    }
  }

  function toggleFolder(name: string) {
    setOpenFolders((prev) => {
      const next = new Set(prev);
      if (next.has(name)) {
        next.delete(name);
      } else {
        next.add(name);
      }
      persistOpenFolders(next);
      return next;
    });
  }

  function handleDeleteHost(host: Host) {
    setConfirmDialog({
      message: t("hosts.deleteHostConfirm", { name: host.name }),
      onConfirm: async () => {
        try {
          await deleteSSHHost(Number(host.id));
          window.dispatchEvent(new CustomEvent("termix:hosts-changed"));
          toast.success(t("hosts.deletedCount", { count: 1 }));
        } catch {
          toast.error(t("hosts.failedToDeleteCount", { count: 1 }));
        }
      },
    });
  }

  async function handleDuplicateHost(host: Host) {
    try {
      const duplicateHost: SSHHostData = {
        name: `${host.name} (copy)`,
        ip: host.ip,
        port: host.port,
        username: host.username,
        folder: host.folder,
        parentHostId: host.parentHostId ? Number(host.parentHostId) : null,
        tags: host.tags ?? [],
        pin: host.pin ?? false,
        notes: host.notes,
        // Key material is never sent to the frontend, so a cloned key-auth
        // host would have authType "key" with no key, which is unusable. Reset to
        // password so the clone is in a connectable (editable) state.
        authType: host.authType === "key" ? "password" : host.authType,
        password: host.authType === "key" ? null : (host.password ?? null),
        key: null,
        keyPassword: null,
        keyType: null,
        credentialId: host.credentialId ? Number(host.credentialId) : null,
        overrideCredentialUsername: host.overrideCredentialUsername ?? false,
        enableSsh: host.enableSsh,
        sshPort: host.sshPort,
        // Saved passwords never reach the browser, so a copy starts without them.
        protocolAuth: Object.fromEntries(
          Object.entries(host.protocolAuth ?? {}).map(([protocol, login]) => [
            protocol,
            {
              authType: login.authType,
              credentialId: login.credentialId ?? null,
              username: login.username ?? null,
              fields: login.fields ?? {},
            },
          ]),
        ),
        forceKeyboardInteractive: host.forceKeyboardInteractive ?? false,
        useSocks5: host.useSocks5,
        socks5Host: host.socks5Host ?? null,
        socks5Port: host.socks5Port ?? null,
        socks5Username: host.socks5Username ?? null,
        socks5Password: host.socks5Password ?? null,
        socks5ProxyChain: host.socks5ProxyChain ?? null,
        jumpHosts: (host.jumpHosts ?? []).map((j) => ({
          hostId: Number(j.hostId),
        })),
        portKnockSequence: host.portKnockSequence ?? [],
        statusCheckEnabled: host.statusCheckEnabled,
        statusCheckInterval: host.statusCheckInterval,
        sshOptions: host.sshOptions ?? null,
      };
      const created = await createSSHHost(duplicateHost);
      // Plugin host settings live outside the host row. Secrets come back
      // redacted, and sending the marker back is a no-op, so they stay unset.
      for (const [pluginId, fields] of Object.entries(
        host.pluginSettings ?? {},
      )) {
        if (!fields || Object.keys(fields).length === 0) continue;
        await updatePluginHostSettings(
          pluginId,
          Number(created.id),
          fields,
        ).catch(() => {});
      }
      window.dispatchEvent(new CustomEvent("termix:hosts-changed"));
      toast.success(t("hosts.duplicatedHost", { name: host.name }));
    } catch {
      toast.error(t("hosts.failedToDuplicateHost"));
    }
  }

  const speedSearch = useHostSpeedSearch();
  const query = speedSearch.open
    ? speedSearch.text.trim().toLowerCase()
    : externalQuery;
  const allHosts = collectAllHosts(children);
  const allFolderPaths = collectAllFolderPaths(children);

  const visibleRows = collectVisibleRows(
    children,
    query,
    openFolders,
    [],
    0,
    closedHostParents,
  );
  const parentRef = useRef<HTMLDivElement>(null);
  const matchingRows = visibleRows
    .map((row, index) => ({ row, index }))
    .filter(
      ({ row }) => !isFolder(row.item) && hostMatchesQuery(row.item, query),
    );
  const activeMatch =
    matchingRows[Math.min(speedSearch.index, matchingRows.length - 1)];

  const isTouchOnly =
    typeof window !== "undefined" && window.matchMedia("(hover: none)").matches;
  const alwaysShowActions = trayTrigger === "always";
  const actionsOnly = trayTrigger === "actionsOnly";
  const clickTrayActive =
    !alwaysShowActions &&
    !actionsOnly &&
    (trayTrigger === "click" || isTouchOnly);
  const isCompactDensity = density === "compact";

  // Fixed, exactly-computed row heights rather than estimate-then-measure:
  // the redesigned rows have a small, known set of shapes (folder header,
  // host closed, host with its tray open, in each density), so there is
  // nothing left to discover at layout time. estimateSize doubled as the
  // real size unconditionally used to cause visible gaps between rows --
  // ResizeObserver-based remeasuring raced the tray's open/close transition
  // and could lock in a stale height for a row that happened to get measured
  // mid-animation. A fixed lookup has no such window: every row's height is
  // decided before the virtualizer ever asks.
  // Re-measured live after fixing two padding bugs: (1) the comfortable-
  // density row's top/bottom padding asymmetry (was pt-2.5 pb-2, now the
  // symmetric py-2), and (2) redundant stacked top padding between the
  // always-visible connection-buttons row and the management-buttons row
  // (the tray wrapper's own pt-1.5 plus the management row's separate
  // pt-1 mt-0.5 compounded into a much larger gap there than between any
  // other pair of rows in the card).
  // Click mode adds a size-5 expand-actions chevron to the name row, which is
  // taller than anything hover mode puts there -- the base heights were
  // measured in hover mode, so a click-mode row renders past its slot and its
  // status stripe runs into the row below. Most visible down an indented
  // sub-host group, where rows stack with no folder header between them.
  // Measured off the rendered row (49.5 in a 45 slot). actionsOnly renders the
  // same chevron but its own constants were measured with it, so it is not
  // included here.
  const CLICK_CHEVRON_EXTRA = clickTrayActive ? 4.5 : 0;
  const HOST_ROW_HEIGHT = (isCompactDensity ? 27.5 : 45) + CLICK_CHEVRON_EXTRA;
  const FOLDER_ROW_HEIGHT = 31.5;
  // "always" mode permanently renders the connection-buttons row plus the
  // management row -- measured directly rather than derived, since it has its
  // own fixed shape. The resource bars are NOT included: they only render for
  // an online host with CPU/RAM, so rowHeight adds RESOURCE_ROW_EXTRA per row.
  // Carries the click-mode chevron so the open row lands at its measured
  // 104.75 rather than always mode's 100.25. The term cancels out of
  // OPEN_TRAY_EXTRA below, leaving HOST_ROW_HEIGHT to supply it once.
  const ALWAYS_ROW_HEIGHT =
    (isCompactDensity ? 73.75 : 83) + CLICK_CHEVRON_EXTRA;
  const OPEN_TRAY_EXTRA = ALWAYS_ROW_HEIGHT - HOST_ROW_HEIGHT;
  // "actionsOnly" permanently renders just the connection-buttons row above
  // the tray; the management row/resource bars stay collapsed until toggled.
  const ACTIONS_ONLY_ROW_HEIGHT = isCompactDensity ? 50.25 : 75.75;
  // Opening the management row from actionsOnly's closed state (which
  // already includes the connection row). Excludes the resource bars for the
  // same reason as ALWAYS_ROW_HEIGHT -- rowHeight adds them per row.
  const ACTIONS_ONLY_OPEN_ROW_HEIGHT = isCompactDensity ? 79.25 : 87.5;
  // Tag pills are a separate flex row. Comfortable density adds the row plus
  // its gap; compact density pulls it upward by 2px but still needs a slot.
  const TAG_ROW_EXTRA = isCompactDensity ? 12.5 : 18.5;
  // The username@ip line plus its gap.
  const ADDRESS_ROW_SAVED = rowFields && !rowFields.showAddress ? 14.5 : 0;
  // showResourceBars:false simply drops RESOURCE_ROW_EXTRA from every row.

  const rowHeight = useCallback(
    (index: number) => {
      const row = visibleRows[index];
      if (!row) return FOLDER_ROW_HEIGHT;
      if (isFolder(row.item)) return FOLDER_ROW_HEIGHT;
      if (isCompactDensity) return 29;
      const tagRowExtra = showTags && row.item.tags?.length ? TAG_ROW_EXTRA : 0;
      // The resource bars only render for an online host that reported CPU/RAM.
      // Reserving their height unconditionally left a gap under every offline
      // row. measureElement corrects any drift from live status this estimate
      // can't see.
      const resourceExtra = rendersResourceRow(
        row.item,
        showResourceBars,
        isCompactDensity,
      )
        ? RESOURCE_ROW_EXTRA
        : 0;
      const tagExtra = tagRowExtra - ADDRESS_ROW_SAVED;
      if (alwaysShowActions)
        return ALWAYS_ROW_HEIGHT + tagExtra + resourceExtra;
      const toggledOpen =
        (openTrayHostId === row.item.id || openMenuHostId === row.item.id) &&
        (clickTrayActive || actionsOnly);
      // In hover mode the tray expands on pointer-over, so the row needs the
      // taller height reserved or it overlaps the row below it.
      const hoverOpen =
        !clickTrayActive &&
        !actionsOnly &&
        !selectionMode &&
        (hoveredHostId === row.item.id || openMenuHostId === row.item.id);
      const isOpen = toggledOpen || hoverOpen;
      // The bars live inside the tray, so they only take space once it opens.
      const openResourceExtra = isOpen ? resourceExtra : 0;
      if (actionsOnly) {
        return (
          (isOpen ? ACTIONS_ONLY_OPEN_ROW_HEIGHT : ACTIONS_ONLY_ROW_HEIGHT) +
          tagExtra +
          openResourceExtra
        );
      }
      return (
        (isOpen ? HOST_ROW_HEIGHT + OPEN_TRAY_EXTRA : HOST_ROW_HEIGHT) +
        tagExtra +
        openResourceExtra
      );
    },
    [
      visibleRows,
      openTrayHostId,
      openMenuHostId,
      hoveredHostId,
      selectionMode,
      clickTrayActive,
      alwaysShowActions,
      actionsOnly,
      showTags,
      HOST_ROW_HEIGHT,
      CLICK_CHEVRON_EXTRA,
      OPEN_TRAY_EXTRA,
      ALWAYS_ROW_HEIGHT,
      ACTIONS_ONLY_ROW_HEIGHT,
      ACTIONS_ONLY_OPEN_ROW_HEIGHT,
      TAG_ROW_EXTRA,
      ADDRESS_ROW_SAVED,
      showResourceBars,
      isCompactDensity,
    ],
  );

  const virtualizer = useVirtualizer({
    count: visibleRows.length,
    getScrollElement: () => parentRef.current,
    estimateSize: rowHeight,
    overscan: 12,
    // The library's default rounds every measurement to a whole pixel. Rows
    // here land on fractions (a 63.84px row rounds to 64), and the rounded-up
    // size becomes the slot pitch -- leaving a visible sliver under every
    // single row, which stacks into the gaps the list is judged by. Keep the
    // sub-pixel size so slots sit flush against the row above.
    measureElement: (element, entry) => {
      const box = entry?.borderBoxSize?.[0];
      return box ? box.blockSize : element.getBoundingClientRect().height;
    },
    getItemKey: (index) => {
      const row = visibleRows[index];
      if (!row) return index;
      // Group-by views (e.g. by tags) can list the same host under several
      // group folders, so parentPath is folded in to keep each occurrence's
      // key unique -- a shared key across rows made the virtualizer collide
      // their measured positions and render them stacked on top of each other.
      return isFolder(row.item)
        ? `folder:${row.item.path ?? row.item.name}`
        : `${row.parentPath}>host:${row.item.id}`;
    },
  });

  // One indicator for the whole tree, placed off the virtualizer's slot
  // geometry rather than by the hovered row. Row-drawn bars disagreed about
  // where the seam was whenever the hovered row's tray expanded it, so two
  // candidate lines appeared and flickered with the pointer.
  const reorderIndicatorTop = (() => {
    if (!arrangeMode || !reorderHoverKey || !reorderHoverEdge) return null;
    const index = visibleRows.findIndex(
      (row) => rowKey(row.item) === reorderHoverKey,
    );
    if (index === -1) return null;
    const slot = virtualizer
      .getVirtualItems()
      .find((vItem) => vItem.index === index);
    if (!slot) return null;
    return reorderHoverEdge === "before" ? slot.start : slot.start + slot.size;
  })();

  // rowHeight is only an estimate: a row's real height also depends on live
  // state the tree can't cheaply know per row (an offline host drops the
  // resource bars "always" mode reserves space for). measureElement corrects
  // it from the DOM, keyed by getItemKey rather than index so a deleted row's
  // size is never reused for whatever shifts into its slot.
  //
  // measure() wipes the ENTIRE measurement cache, so it may only run when
  // every row's shape changes at once -- a density/trigger/tag switch. Hover
  // and tray state are deliberately absent: they change one row, which
  // re-renders and re-measures itself through the observer anyway, whereas
  // calling measure() for them threw all 5000 rows back to their estimates
  // and made the list visibly jump apart on every pointer move.
  useLayoutEffect(() => {
    virtualizer.measure();
    // Rebuild the cleared size cache before measuring the mounted rows again.
    virtualizer.getTotalSize();
    // Unchanged rows will not trigger ResizeObserver after their cache is cleared.
    parentRef.current
      ?.querySelectorAll<HTMLElement>("[data-index]")
      .forEach((element) => virtualizer.measureElement(element));
  }, [
    virtualizer,
    density,
    trayTrigger,
    showTags,
    showResourceBars,
    ADDRESS_ROW_SAVED,
  ]);

  useEffect(() => {
    if (speedSearch.open) speedSearch.inputRef.current?.focus();
  }, [speedSearch.open, speedSearch.inputRef]);
  const activeMatchIndex = activeMatch?.index;
  useEffect(() => {
    if (speedSearch.open && activeMatchIndex !== undefined)
      virtualizer.scrollToIndex(activeMatchIndex, { align: "auto" });
  }, [speedSearch.open, activeMatchIndex, query, virtualizer]);

  if (loading) {
    return (
      <div className="relative flex flex-col flex-1 min-h-0">
        <div className="flex-1 min-h-0 overflow-y-auto px-2 py-2 space-y-1.5">
          {[28, 20, 24, 20, 28, 20].map((w, i) => (
            <div
              key={i}
              className={`flex items-center gap-2 px-3 py-2 ${i % 2 === 1 ? "ml-4" : ""}`}
            >
              <div className="size-3 rounded-sm bg-muted/50 animate-pulse shrink-0" />
              <div
                className="h-3 rounded bg-muted/50 animate-pulse"
                style={{ width: `${w * 3}px` }}
              />
            </div>
          ))}
          <div className="flex items-center justify-center gap-2 pt-4 text-muted-foreground/40">
            <Loader2 className="size-3.5 animate-spin" />
            <span className="text-xs">{t("hosts.loadingHosts")}</span>
          </div>
        </div>
      </div>
    );
  }

  return (
    <div
      ref={rootRef}
      className="relative flex flex-col flex-1 min-h-0"
      onKeyDown={(event) => {
        if (selectionMode || arrangeMode) return;
        speedSearch.onKeyDown(
          event,
          matchingRows.length,
          (index) => {
            const host = matchingRows[index]?.row.item;
            if (!host || isFolder(host)) return;
            const type = resolveHostTabType(host);
            if (type)
              onOpenTab(host, type, {
                forceNewTab: hostClickBehavior === "newTab",
              });
          },
          () => parentRef.current?.focus(),
        );
      }}
      onBlur={(event) => {
        if (!event.currentTarget.contains(event.relatedTarget as Node | null))
          speedSearch.close();
      }}
    >
      {speedSearch.open && (
        <div className="flex items-center gap-2 border-b border-border bg-popover px-3 py-2">
          <input
            ref={speedSearch.inputRef}
            type="search"
            aria-label={t("hosts.speedSearch")}
            placeholder={t("hosts.speedSearch")}
            value={speedSearch.text}
            onChange={(event) => speedSearch.change(event.target.value)}
            className="min-w-0 flex-1 bg-transparent text-sm outline-none"
          />
          <span role="status" className="text-xs text-muted-foreground">
            {matchingRows.length
              ? Math.min(speedSearch.index + 1, matchingRows.length)
              : 0}{" "}
            / {matchingRows.length}
          </span>
        </div>
      )}
      <div
        ref={parentRef}
        tabIndex={0}
        aria-label={t("hosts.speedSearchList")}
        className={`flex-1 min-h-0 overflow-y-auto ${rootDragOver ? "ring-1 ring-inset ring-accent-brand/50" : ""}`}
        // Only the container's own empty space is a root drop target. Without
        // the target check this fired for every child row the pointer crossed
        // (dragover bubbles), and dragleave never cleared it because leaving a
        // child never satisfies currentTarget === target -- so the ring stuck
        // around for the rest of the session.
        onDragOver={(e) => {
          if (arrangeMode && draggedHostIds && e.currentTarget === e.target) {
            e.preventDefault();
            setRootDragOver(true);
          }
        }}
        onDragLeave={(e) => {
          if (e.currentTarget === e.target) setRootDragOver(false);
        }}
        onDragEnd={() => setRootDragOver(false)}
        onDrop={(e) => {
          setRootDragOver(false);
          if (arrangeMode && draggedHostIds && e.currentTarget === e.target) {
            e.preventDefault();
            handleMoveHostsToFolder(draggedHostIds, "");
          }
        }}
      >
        {visibleRows.length === 0 ? (
          <EmptyState
            className="py-12"
            icon={Server}
            title={
              query ? t("hosts.noHostsMatchSearch") : t("hosts.noHostsYet")
            }
            hint={query ? undefined : t("hosts.noHostsYetHint")}
            action={
              query ? undefined : (
                <Button
                  size="sm"
                  variant="outline"
                  className="h-7 text-[11px] border-accent-brand/40 text-accent-brand hover:bg-accent-brand/10 hover:text-accent-brand"
                  onClick={() =>
                    window.dispatchEvent(
                      new CustomEvent("host-manager:add-host"),
                    )
                  }
                >
                  <Plus className="size-3" />
                  {t("hosts.addHost")}
                </Button>
              )
            }
          />
        ) : (
          <div
            className="relative w-full"
            style={{ height: virtualizer.getTotalSize() }}
          >
            {reorderIndicatorTop !== null && (
              <ReorderIndicator top={reorderIndicatorTop} />
            )}
            {virtualizer.getVirtualItems().map((vItem) => {
              const row = visibleRows[vItem.index];
              if (!row) return null;
              const { item, depth } = row;
              return (
                <div
                  key={vItem.key}
                  data-index={vItem.index}
                  ref={virtualizer.measureElement}
                  data-speed-search-active={
                    (speedSearch.open && activeMatch?.index === vItem.index) ||
                    undefined
                  }
                  className={`absolute top-0 left-0 w-full ${speedSearch.open && activeMatch?.index === vItem.index ? "ring-1 ring-inset ring-accent-brand bg-accent/30" : ""}`}
                  style={{
                    transform: `translateY(${vItem.start}px)`,
                  }}
                >
                  {isFolder(item) ? (
                    <FolderItem
                      folder={item}
                      depth={depth}
                      flat
                      onOpenTab={onOpenTab}
                      onEditHost={onEditHost}
                      onShareHost={onShareHost}
                      onDeleteHost={handleDeleteHost}
                      onDuplicateHost={handleDuplicateHost}
                      query={query}
                      openFolders={openFolders}
                      onToggleFolder={toggleFolder}
                      selectionMode={selectionMode}
                      selectedHostIds={selectedHostIds}
                      onToggleSelect={toggleSelect}
                      onToggleSelectFolder={(f) =>
                        toggleSelectMany(
                          collectAllHosts(f.children).map((h) => h.id),
                        )
                      }
                      openMenuHostId={openMenuHostId}
                      onMenuOpenChange={setOpenMenuHostId}
                      openTrayHostId={openTrayHostId}
                      onTrayOpenChange={setOpenTrayHostId}
                      onManageFolder={handleManageFolder}
                      onDeleteFolder={handleDeleteFolder}
                      onOpenAllSessions={handleOpenAllSessions}
                      onShareFolder={(folder) =>
                        setShareFolderTarget(folder.path ?? folder.name)
                      }
                      onMoveHostsToFolder={handleMoveHostsToFolder}
                      draggedHostIds={draggedHostIds}
                      onDragHostStart={handleDragHostStart}
                      onDragEnd={() => {
                        setDraggedHostIds(null);
                        setDraggedReorderKey(null);
                        setReorderHoverKey(null);
                        setReorderHoverEdge(null);
                      }}
                      stripeIndex={vItem.index}
                      density={density}
                      trayTrigger={trayTrigger}
                      showTags={showTags}
                      openOnDoubleClick={openOnDoubleClick}
                      showFolderPaths={showFolderPaths}
                      hostClickBehavior={hostClickBehavior}
                      arrangeMode={arrangeMode}
                      isDragging={
                        draggedReorderKey === `folder:${item.path ?? item.name}`
                      }
                      onReorderDrop={handleReorderDrop}
                      onFolderDragStart={(path) =>
                        setDraggedReorderKey(`folder:${path}`)
                      }
                      onFolderDragEnd={() => {
                        setDraggedReorderKey(null);
                        setReorderHoverKey(null);
                        setReorderHoverEdge(null);
                      }}
                      isReorderHovered={
                        reorderHoverKey === `folder:${item.path ?? item.name}`
                      }
                      reorderHoverEdge={reorderHoverEdge}
                      onReorderHoverChange={(edge) => {
                        const key = `folder:${item.path ?? item.name}`;
                        setReorderHoverKey(edge ? key : null);
                        setReorderHoverEdge(edge);
                      }}
                    />
                  ) : (
                    <HostItem
                      host={item}
                      depth={depth}
                      onOpenTab={(type, options) =>
                        onOpenTab(item, type, options)
                      }
                      onEditHost={() => onEditHost(item)}
                      onShareHost={
                        onShareHost ? () => onShareHost(item) : undefined
                      }
                      onDelete={() => handleDeleteHost(item)}
                      onDuplicate={() => handleDuplicateHost(item)}
                      query={query}
                      stripeIndex={vItem.index}
                      selectionMode={selectionMode}
                      selected={selectedHostIds.has(item.id)}
                      onToggleSelect={() => toggleSelect(item.id)}
                      isMenuOpen={openMenuHostId === item.id}
                      onMenuOpenChange={(open) =>
                        setOpenMenuHostId(open ? item.id : null)
                      }
                      isTrayOpen={openTrayHostId === item.id}
                      onTrayOpenChange={(open) =>
                        setOpenTrayHostId(open ? item.id : null)
                      }
                      isHovered={hoveredHostId === item.id}
                      onHoverChange={(hovered) =>
                        setHoveredHostId((prev) =>
                          hovered ? item.id : prev === item.id ? null : prev,
                        )
                      }
                      onDragStart={() => {
                        // Both paths arm at once: the drop target decides
                        // whether this becomes a reorder or a move/nest.
                        setDraggedReorderKey(`host:${item.id}`);
                        handleDragHostStart(item.id);
                      }}
                      onDragEnd={() => {
                        setDraggedHostIds(null);
                        setDraggedReorderKey(null);
                        setReorderHoverKey(null);
                        setReorderHoverEdge(null);
                      }}
                      density={density}
                      trayTrigger={trayTrigger}
                      showTags={showTags}
                      openOnDoubleClick={openOnDoubleClick}
                      hostClickBehavior={hostClickBehavior}
                      showResourceBars={showResourceBars}
                      showStatusStripes={showStatusStripes}
                      rowFields={rowFields}
                      rowActions={rowActions}
                      arrangeMode={arrangeMode}
                      isDragging={draggedReorderKey === `host:${item.id}`}
                      onReorderDrop={(position) =>
                        handleReorderDrop(`host:${item.id}`, position)
                      }
                      isReorderHovered={reorderHoverKey === `host:${item.id}`}
                      reorderHoverEdge={reorderHoverEdge}
                      onReorderHoverChange={(edge) => {
                        setReorderHoverKey(edge ? `host:${item.id}` : null);
                        setReorderHoverEdge(edge);
                      }}
                      isExpanded={!closedHostParents.has(hostExpandKey(item))}
                      onToggleExpand={
                        item.childHosts && item.childHosts.length > 0
                          ? () => toggleHostParent(hostExpandKey(item))
                          : undefined
                      }
                      draggedHostIds={draggedHostIds}
                      onDropChildHosts={(ids) =>
                        handleMoveHostsToParent(ids, item.id)
                      }
                    />
                  )}
                </div>
              );
            })}
          </div>
        )}
      </div>

      {/* Floating selection bar */}
      {selectionMode && (
        <div className="motion-panel-enter absolute bottom-4 inset-x-3 z-50">
          <div className="bg-popover border border-border shadow-xl px-2.5 py-2 flex items-center gap-1.5 flex-wrap">
            <span className="text-xs font-semibold tabular-nums shrink-0">
              {t("hosts.nSelected", { count: selectedHostIds.size })}
            </span>
            <div className="w-px h-4 bg-border mx-0.5" />
            <button
              className="text-[10px] text-muted-foreground hover:text-foreground px-1.5 py-1 hover:bg-muted rounded transition-colors"
              onClick={() => {
                if (selectedHostIds.size === allHosts.length)
                  setSelectedHostIds(new Set());
                else setSelectedHostIds(new Set(allHosts.map((h) => h.id)));
              }}
            >
              {selectedHostIds.size === allHosts.length
                ? t("hosts.deselectAll")
                : t("hosts.selectAll")}
            </button>
            <DropdownMenu>
              <DropdownMenuTrigger asChild>
                <button
                  className="text-[10px] text-muted-foreground hover:text-foreground px-1.5 py-1 hover:bg-muted rounded transition-colors flex items-center gap-1 disabled:opacity-40"
                  disabled={selectedHostIds.size === 0}
                >
                  {t("hosts.featuresMenu")} <ChevronDown className="size-2.5" />
                </button>
              </DropdownMenuTrigger>
              <DropdownMenuContent align="start" className="text-xs">
                {hostSwitchPlugins.flatMap((plugin) =>
                  [true, false].map((value) => (
                    <DropdownMenuItem
                      key={`${plugin.id}:${value}`}
                      onClick={async () => {
                        const ids = Array.from(selectedHostIds).map(Number);
                        try {
                          await bulkUpdateSSHHosts(ids, {
                            pluginEnable: { [plugin.id]: value },
                          });
                          window.dispatchEvent(
                            new CustomEvent("termix:hosts-changed"),
                          );
                          toast.success(
                            t("hosts.updatedCount", { count: ids.length }),
                          );
                        } catch {
                          toast.error(t("hosts.bulkUpdateFailed"));
                        }
                      }}
                    >
                      <PluginIcon
                        name={plugin.icon}
                        className="size-3.5 mr-2"
                      />
                      {t(
                        value
                          ? "hosts.enablePluginFeature"
                          : "hosts.disablePluginFeature",
                        { name: pluginName(t, plugin) },
                      )}
                    </DropdownMenuItem>
                  )),
                )}
              </DropdownMenuContent>
            </DropdownMenu>
            <DropdownMenu>
              <DropdownMenuTrigger asChild>
                <button
                  className="text-[10px] text-muted-foreground hover:text-foreground px-1.5 py-1 hover:bg-muted rounded transition-colors flex items-center gap-1 disabled:opacity-40"
                  disabled={selectedHostIds.size === 0}
                >
                  {t("hostDefaults.resetMenu")}{" "}
                  <ChevronDown className="size-2.5" />
                </button>
              </DropdownMenuTrigger>
              <DropdownMenuContent align="start" className="text-xs">
                {[
                  { id: "all", label: t("hostDefaults.resetAll") },
                  { id: "core", label: t("hostDefaults.resetCore") },
                  ...hostSettingPlugins.map((plugin) => ({
                    id: plugin.id,
                    label: pluginName(t, plugin),
                  })),
                ].map((option) => (
                  <DropdownMenuItem
                    key={option.id}
                    onClick={async () => {
                      const ids = Array.from(selectedHostIds).map(Number);
                      try {
                        await resetHostToDefaults(
                          ids,
                          option.id === "all"
                            ? { all: true }
                            : { namespaces: [option.id] },
                        );
                        window.dispatchEvent(
                          new CustomEvent("termix:hosts-changed"),
                        );
                        toast.success(
                          t("hostDefaults.resetDone", { count: ids.length }),
                        );
                      } catch {
                        toast.error(t("hosts.bulkUpdateFailed"));
                      }
                    }}
                  >
                    <RotateCcw className="size-3.5 mr-2" />
                    {option.label}
                  </DropdownMenuItem>
                ))}
              </DropdownMenuContent>
            </DropdownMenu>
            <DropdownMenu>
              <DropdownMenuTrigger asChild>
                <button
                  className="text-[10px] text-muted-foreground hover:text-foreground px-1.5 py-1 hover:bg-muted rounded transition-colors flex items-center gap-1 disabled:opacity-40"
                  disabled={selectedHostIds.size === 0}
                >
                  {t("hosts.moveMenu")} <ChevronDown className="size-2.5" />
                </button>
              </DropdownMenuTrigger>
              <DropdownMenuContent align="start" className="text-xs">
                <DropdownMenuItem
                  onClick={async () => {
                    const ids = Array.from(selectedHostIds).map(Number);
                    try {
                      await bulkUpdateSSHHosts(ids, { folder: "" });
                      window.dispatchEvent(
                        new CustomEvent("termix:hosts-changed"),
                      );
                      toast.success(t("hosts.movedToRoot"));
                    } catch {
                      toast.error(t("hosts.failedToMoveHosts"));
                    }
                  }}
                >
                  <FolderOpen className="size-3.5 mr-2" />
                  {t("hosts.noFolderOption")}
                </DropdownMenuItem>
                {allFolderPaths.map((f) => (
                  <DropdownMenuItem
                    key={f}
                    onClick={async () => {
                      const ids = Array.from(selectedHostIds).map(Number);
                      try {
                        await bulkUpdateSSHHosts(ids, { folder: f });
                        window.dispatchEvent(
                          new CustomEvent("termix:hosts-changed"),
                        );
                        toast.success(t("hosts.movedToFolder", { folder: f }));
                      } catch {
                        toast.error(t("hosts.failedToMoveHosts"));
                      }
                    }}
                  >
                    <FolderOpen className="size-3.5 mr-2" />
                    {f}
                  </DropdownMenuItem>
                ))}
              </DropdownMenuContent>
            </DropdownMenu>
            <button
              className="text-[10px] text-muted-foreground hover:text-foreground px-1.5 py-1 hover:bg-muted rounded transition-colors flex items-center gap-1 disabled:opacity-40"
              disabled={selectedHostIds.size === 0}
              onClick={() => {
                onExportSelected?.(Array.from(selectedHostIds));
                setSelectedHostIds(new Set());
                onToggleSelectionMode();
              }}
            >
              <Download className="size-3" />
              {t("hosts.export.bulkButton")}
            </button>
            <button
              className="text-[10px] text-muted-foreground hover:text-foreground px-1.5 py-1 hover:bg-muted rounded transition-colors flex items-center gap-1 disabled:opacity-40"
              disabled={selectedHostIds.size === 0}
              onClick={() => {
                const selectedHosts = allHosts.filter((h) =>
                  selectedHostIds.has(String(h.id)),
                );
                for (const host of selectedHosts) {
                  const type = resolveHostTabType(host);
                  if (type) onOpenTab(host, type);
                }
                setSelectedHostIds(new Set());
                onToggleSelectionMode();
              }}
            >
              <Terminal className="size-3" />
              {t("hosts.connectSelected")}
            </button>
            <button
              className="text-[10px] text-destructive hover:text-destructive px-1.5 py-1 hover:bg-destructive/10 rounded transition-colors disabled:opacity-40"
              disabled={selectedHostIds.size === 0}
              onClick={() => {
                setConfirmDialog({
                  message: t("hosts.deleteHostsConfirm", {
                    count: selectedHostIds.size,
                  }),
                  onConfirm: async () => {
                    const ids = Array.from(selectedHostIds);
                    const results = await Promise.allSettled(
                      ids.map((id) => deleteSSHHost(Number(id))),
                    );
                    const succeeded = results.filter(
                      (r) => r.status === "fulfilled",
                    ).length;
                    const failed = results.filter(
                      (r) => r.status === "rejected",
                    ).length;
                    setSelectedHostIds(new Set());
                    window.dispatchEvent(
                      new CustomEvent("termix:hosts-changed"),
                    );
                    if (succeeded > 0)
                      toast.success(
                        t("hosts.deletedCount", { count: succeeded }),
                      );
                    if (failed > 0)
                      toast.error(
                        t("hosts.failedToDeleteCount", { count: failed }),
                      );
                  },
                });
              }}
            >
              {t("hosts.deleteSelected")}
            </button>
            <div className="flex-1" />
            <button
              className="text-[10px] text-muted-foreground hover:text-foreground px-1.5 py-1 hover:bg-muted rounded transition-colors"
              onClick={() => {
                onToggleSelectionMode();
                setSelectedHostIds(new Set());
              }}
            >
              {t("hosts.cancelSelection")}
            </button>
          </div>
        </div>
      )}

      <FolderMetadataDialog
        open={folderDialog !== null}
        mode={folderDialog?.mode ?? "create"}
        initial={
          folderDialog?.folder
            ? {
                name: folderDialog.folder.name,
                color: folderDialog.folder.color,
                icon: folderDialog.folder.icon,
                credentialId: folderDialog.folder.credentialId,
                localOnly: folderDialog.folder.localOnly,
              }
            : undefined
        }
        existingPaths={allFolderPaths}
        currentPath={
          folderDialog?.folder
            ? (folderDialog.folder.path ?? folderDialog.folder.name)
            : undefined
        }
        onOpenChange={(v) => !v && setFolderDialog(null)}
        onSubmit={handleSaveFolderMetadata}
      />

      <HostShareModal
        open={shareFolderTarget !== null}
        onClose={() => setShareFolderTarget(null)}
        host={null}
        folder={shareFolderTarget}
      />
    </div>
  );
}