import { useQueryClient } from "@tanstack/react-query";
import { EventType } from "@umt/contracts";
import {
  ArrowDownAZ,
  ArrowUp,
  ArrowUpAZ,
  ClipboardCopy,
  Cloud,
  Copy,
  Download,
  Eye,
  EyeOff,
  FileDown,
  FileStack,
  FolderInput,
  FolderOpen,
  FolderPlus,
  FolderTree,
  HardDrive,
  Keyboard,
  Library,
  MoreHorizontal,
  PanelLeftClose,
  PanelLeftOpen,
  PenLine,
  RefreshCw,
  RotateCw,
  ScanSearch,
  Search,
  SearchX,
  ServerCrash,
  Sparkles,
  Trash2,
  Wand2,
  X,
} from "lucide-react";
import { useCallback, useEffect, useMemo, useRef, useState } from "react";
import { useNavigate, useSearchParams } from "react-router";
import { toast } from "sonner";
import { useSession } from "~/api/auth.ts";
import {
  type FileEntry,
  type FileRef,
  type FileRoot,
  filesErrorText,
  filesKeys,
  filesMockEnabled,
  isRootOffline,
  type ListQuery,
  refKey,
  refreshRemoteDir,
  useFileList,
  useFileRoots,
  useProbe,
  useTrash,
} from "~/api/files.ts";
import { EmptyState, ErrorState, LoadingState } from "~/components/console/empty-state.tsx";
import { StatusBadge } from "~/components/console/status-badge.tsx";
import { useListPagination } from "~/components/console/use-list-pagination.ts";
import { ContextMenu, type MenuAnchor, type MenuItem } from "~/components/files/context-menu.tsx";
import {
  CopyPathDialog,
  DeleteDialog,
  MkdirDialog,
  RefreshMetadataDialog,
  RenameDialog,
  ScrapeDialog,
  TransferDialog,
  UploadButton,
} from "~/components/files/dialogs.tsx";
import { DirTree } from "~/components/files/dir-tree.tsx";
import { FileDetail } from "~/components/files/file-detail.tsx";
import { DRAG_MIME, FileList } from "~/components/files/file-list.tsx";
import {
  displayPath,
  emptySelection,
  FILTER_CHIPS,
  groupRoots,
  initialLocation,
  type Loc,
  type MenuKey,
  menuModel,
  OP_LABEL,
  opApplies,
  opDisabledReason,
  parentRel,
  pruneSelection,
  type Selection,
  SORT_OPTIONS,
  totalSize,
} from "~/components/files/model.ts";
import { PathBreadcrumb } from "~/components/files/path-breadcrumb.tsx";
import { ShortcutsDialog } from "~/components/files/shortcuts-dialog.tsx";
import { TrashView } from "~/components/files/trash-view.tsx";
import { useIsMobile } from "~/components/files/use-mobile.ts";
import type { WizardEntity } from "~/components/organize-wizard/model.ts";
import { type OrganizeSource, OrganizeWizard } from "~/components/organize-wizard/organize-wizard.tsx";
import { Button } from "~/components/ui/button.tsx";
import { Input } from "~/components/ui/input.tsx";
import { Pagination } from "~/components/ui/pagination.tsx";
import { SegmentedControl } from "~/components/ui/segmented.tsx";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "~/components/ui/select.tsx";
import { Sheet, SheetContent, SheetHeader, SheetTitle } from "~/components/ui/sheet.tsx";
import { relTime } from "~/components/workbench/release-fields.ts";
import { useSse } from "~/lib/sse.ts";
import { cn, formatBytes } from "~/lib/utils.ts";

const HEALTH_REASON: Record<string, string> = {
  root_missing: "挂载点不存在",
  sentinel_missing: "目录不可访问或未挂载",
  timeout: "探测超时",
  permission_denied: "没有读取权限",
};
const healthReasonText = (r: string | null) => (r ? (HEALTH_REASON[r] ?? r) : "挂载点没有响应");

type Dialog =
  | { kind: "rename"; entry: FileEntry }
  | { kind: "transfer"; items: FileRef[]; mode: "move" | "copy"; target?: FileRef | null }
  | { kind: "delete"; items: FileRef[] }
  | { kind: "mkdir" }
  | { kind: "copyPath"; entry: FileEntry }
  | { kind: "refresh"; items: FileEntry[] }
  | { kind: "scrape"; items: FileEntry[] }
  | { kind: "wizard"; source: OrganizeSource }
  | { kind: "wizardSource"; source: Extract<OrganizeSource, { kind: "files" }> }
  | { kind: "shortcuts" };

/** 宽布局:内容区不受全站最大宽度限制,目录树贴着侧边栏(layout.tsx 读 handle.layout) */
export const handle = { layout: "wide" };

const TREE_W_KEY = "umt-files-tree-w";
const TREE_W_DEFAULT = 280;
const TREE_W_MIN = 200;
const TREE_W_MAX = 520;
const TREE_OPEN_KEY = "umt-files-tree-open";
const LAST_LOC_KEY = "umt-files-last";
const FILES_CHANGED = "files.changed";

const MENU_ICON: Record<MenuKey, typeof FolderOpen> = {
  open: FolderOpen,
  organize: Wand2,
  identify: Sparkles,
  rename: PenLine,
  move: FolderInput,
  copy: Copy,
  scrape: RefreshCw,
  writeNfo: FileDown,
  probe: ScanSearch,
  copyPath: ClipboardCopy,
  openMedia: Library,
  records: FileStack,
  delete: Trash2,
};
const MENU_HINT: Partial<Record<MenuKey, string>> = { open: "Enter", rename: "F2", delete: "Del" };

function readStore(key: string): string | null {
  try {
    return localStorage.getItem(key);
  } catch {
    return null;
  }
}
function writeStore(key: string, v: string) {
  try {
    localStorage.setItem(key, v);
  } catch {
    // 存储不可用时不记
  }
}

function useTreeWidth() {
  const [w, setW] = useState(TREE_W_DEFAULT);
  useEffect(() => {
    const v = Number(readStore(TREE_W_KEY));
    if (v >= TREE_W_MIN && v <= TREE_W_MAX) setW(v);
  }, []);
  const save = (v: number) => {
    const c = Math.max(TREE_W_MIN, Math.min(TREE_W_MAX, Math.round(v)));
    setW(c);
    writeStore(TREE_W_KEY, String(c));
  };
  return [w, save] as const;
}

function useTreeOpen() {
  const [open, setOpen] = useState(true);
  useEffect(() => {
    if (readStore(TREE_OPEN_KEY) === "0") setOpen(false);
  }, []);
  const save = (v: boolean) => {
    setOpen(v);
    writeStore(TREE_OPEN_KEY, v ? "1" : "0");
  };
  return [open, save] as const;
}

function readLastLoc(): Loc | null {
  try {
    const v = JSON.parse(readStore(LAST_LOC_KEY) ?? "null") as Loc | null;
    return v && typeof v.root === "string" && typeof v.path === "string" ? v : null;
  } catch {
    return null;
  }
}

const hnrPathsOf = (list: FileEntry[]) =>
  list.filter((e) => e.download && (e.download.hnr !== "satisfied" || e.status === "downloading")).map((e) => e.path);

/** 折叠后的左栏:52px 圆角卡片里的图标条(登记目录 + 回收站),展开钮与主面板工具栏第一行对齐 */
function TreeRail({
  roots,
  current,
  onSelect,
  onExpand,
  trashCount,
  trashOpen,
  onTrash,
}: {
  roots: FileRoot[];
  current: string;
  onSelect: (loc: Loc) => void;
  onExpand: () => void;
  trashCount: string;
  trashOpen: boolean;
  onTrash: () => void;
}) {
  return (
    <nav aria-label="登记目录" className="flex flex-col items-center gap-1 py-2.5">
      <Button variant="ghost" size="icon-sm" aria-label="展开目录树" title="展开目录树" onClick={onExpand}>
        <PanelLeftOpen />
      </Button>
      <span aria-hidden className="my-1 h-px w-6 bg-border" />
      {groupRoots(roots).flatMap((g) =>
        g.items.map((r) => {
          const Icon = r.kind === "download" ? Download : r.kind === "storage" ? Cloud : HardDrive;
          return (
            <button
              key={r.id}
              type="button"
              title={`${r.name}${r.health === "offline" ? " · 离线" : ""}`}
              aria-label={r.name}
              aria-current={current === r.id && !trashOpen ? "location" : undefined}
              onClick={() => onSelect({ root: r.id, path: "" })}
              className={cn(
                "relative grid h-8 w-8 place-items-center rounded-lg text-muted-foreground hover:bg-foreground/[0.06] hover:text-foreground",
                current === r.id && !trashOpen && "pill-selected text-foreground",
              )}
            >
              <Icon className="h-4 w-4" />
              <span
                aria-hidden
                className={cn(
                  "absolute right-1 bottom-1 h-1.5 w-1.5 rounded-full",
                  r.health === "healthy" ? "bg-success" : r.health === "offline" ? "bg-destructive" : "bg-warning",
                )}
              />
            </button>
          );
        }),
      )}
      <span aria-hidden className="my-1 h-px w-6 bg-border" />
      <button
        type="button"
        title={`回收站 ${trashCount}`}
        aria-label={`回收站 ${trashCount}`}
        aria-current={trashOpen ? "location" : undefined}
        onClick={onTrash}
        className={cn(
          "grid h-8 w-8 place-items-center rounded-lg text-muted-foreground hover:bg-foreground/[0.06] hover:text-foreground",
          trashOpen && "pill-selected text-foreground",
        )}
      >
        <Trash2 className="h-4 w-4" />
      </button>
    </nav>
  );
}

export default function FilesPage() {
  const [params, setParams] = useSearchParams();
  const navigate = useNavigate();
  const qc = useQueryClient();
  const session = useSession();
  const isAdmin = session.data?.actor?.type === "admin";
  const mobile = useIsMobile();
  const [treeW, setTreeW] = useTreeWidth();
  const [treeOpen, setTreeOpenStored] = useTreeOpen();
  const roots = useFileRoots();
  const rootList = roots.data ?? [];
  const trash = useTrash();
  const trashFirst = trash.data?.pages[0];
  const trashCount = trashFirst ? `${trashFirst.items.length}${trashFirst.nextCursor ? "+" : ""}` : "";

  const rootId = params.get("root") ?? "";
  const path = params.get("path") ?? "";
  const sort = (params.get("sort") ?? "name") as ListQuery["sort"];
  const order = (params.get("order") ?? "asc") as "asc" | "desc";
  const filter = params.get("f") ?? "";
  const hidden = params.get("hidden") === "1";
  const selParam = params.get("sel");
  const identifyAuto = params.get("idf") === "1";
  // 回收站是右侧的一个视图(?view=trash),不再单独一页
  const trashView = params.get("view") === "trash";
  const [qInput, setQInput] = useState(params.get("q") ?? "");
  const q = params.get("q") ?? "";
  const root = rootList.find((r) => r.id === rootId);

  const patch = useCallback(
    (p: Record<string, string | null>, replace = false) =>
      setParams(
        (prev) => {
          const next = new URLSearchParams(prev);
          for (const [k, v] of Object.entries(p)) {
            if (v === null || v === "") next.delete(k);
            else next.set(k, v);
          }
          return next;
        },
        { replace },
      ),
    [setParams],
  );

  // 初始位置:上次位置 > 第一个下载目录 > 第一个库根(§2 #2)
  useEffect(() => {
    if (rootId || trashView || !rootList.length) return;
    const loc = initialLocation(rootList, readLastLoc());
    if (loc) patch({ root: loc.root, path: loc.path || null }, true);
  }, [rootId, trashView, rootList, patch]);

  // 记住上次位置
  useEffect(() => {
    if (root) writeStore(LAST_LOC_KEY, JSON.stringify({ root: root.id, path }));
  }, [root, path]);

  // 搜索 300 ms 防抖写回 URL
  useEffect(() => {
    const t = setTimeout(() => {
      if (qInput.trim() !== q) patch({ q: qInput.trim() || null }, true);
    }, 300);
    return () => clearTimeout(t);
  }, [qInput, q, patch]);

  const listQ: ListQuery | null =
    root && root.health !== "offline" ? { root: root.id, path, sort, order, q, filter, hidden } : null;
  const list = useFileList(listQ);
  const pages = useMemo(() => list.data?.pages ?? [], [list.data]);
  const entries = useMemo(() => pages.flatMap((p) => p.entries), [pages]);
  const paged = useListPagination(entries, {
    hasMore: list.hasNextPage,
    onLoadMore: () => list.fetchNextPage(),
    loadingMore: list.isFetchingNextPage,
    error: list.error,
    resetKey: JSON.stringify({ rootId, path, q, sort, order, filter, hidden }),
  });
  const first = pages[0];
  const keyOf = useCallback((e: FileEntry) => refKey({ root: rootId, path: e.path }), [rootId]);

  // 目录快照变了(cursor stale)→ 从头重载
  const refetchList = list.refetch;
  useEffect(() => {
    if (pages.some((p) => p.stale)) void refetchList();
  }, [pages, refetchList]);

  const [sel, setSel] = useState<Selection>(emptySelection);
  // biome-ignore lint/correctness/useExhaustiveDependencies: 换目录清空选择
  useEffect(() => setSel(emptySelection()), [rootId, path]);
  useEffect(() => {
    setSel((s) => {
      const n = pruneSelection(s, entries.map(keyOf));
      return n.keys.size === s.keys.size && n.anchor === s.anchor && n.focus === s.focus ? s : n;
    });
  }, [entries, keyOf]);

  const [dialog, setDialog] = useState<Dialog | null>(null);
  const [menu, setMenu] = useState<{ at: MenuAnchor; items: MenuItem[] } | null>(null);
  const [treeSheet, setTreeSheet] = useState(false);
  const [searchOpen, setSearchOpen] = useState(false);
  const dragRefs = useRef<FileRef[]>([]);
  const gridRef = useRef<HTMLDivElement>(null);
  const searchRef = useRef<HTMLInputElement>(null);
  const probe = useProbe();

  const selected = useMemo(() => entries.filter((e) => sel.keys.has(keyOf(e))), [entries, sel.keys, keyOf]);
  const detail = selParam != null ? (entries.find((e) => e.path === selParam) ?? null) : null;

  // SSE:files.changed 与整理事件 → 刷新受影响目录
  useSse([FILES_CHANGED, EventType.organizationChanged], (ev) => {
    const p = ev.payload as { rootId?: string; dirs?: string[] } | undefined;
    if (ev.type === FILES_CHANGED && p?.rootId) {
      for (const d of p.dirs ?? [""]) {
        void qc.invalidateQueries({ queryKey: ["files", "list", p.rootId, d] });
        void qc.invalidateQueries({ queryKey: filesKeys.tree(p.rootId, d) });
      }
      void qc.invalidateQueries({ queryKey: filesKeys.trash });
    } else void qc.invalidateQueries({ queryKey: ["files", "list"] });
  });

  const go = (loc: { root: string; path: string }) => {
    setTreeSheet(false);
    patch({ root: loc.root, path: loc.path || null, sel: null, idf: null, q: null, view: null });
    setQInput("");
  };
  const open = (e: FileEntry) => {
    if (e.escape) return toast.error("链接指向登记目录之外，不能打开");
    if (e.type === "dir") go({ root: rootId, path: e.path });
    else patch({ sel: e.path, idf: null });
  };
  const showTrash = () => {
    setTreeSheet(false);
    patch({ view: "trash", sel: null, idf: null });
  };
  const up = () => {
    if (path) go({ root: rootId, path: parentRel(path) });
  };

  const refs = (list: FileEntry[]) => list.map((e) => ({ root: rootId, path: e.path }));
  const targets = (e?: FileEntry) => (e && !sel.keys.has(keyOf(e)) ? [e] : selected.length ? selected : e ? [e] : []);

  /** 整理只取视频和目录;选中的字幕/NFO 等附属文件随主文件处理,不单独提交 */
  const openWizard = (all: FileEntry[], preset?: WizardEntity | null) => {
    if (!root || !all.length) return;
    const list = all.filter((x) => opApplies("identify", x));
    if (!list.length) return toast.error("只有视频或目录能整理");
    const why = list.map((x) => opDisabledReason("organize", x, root)).find(Boolean);
    if (why) return toast.error(why);
    setDialog({
      kind: "wizard",
      source: { kind: "files", items: refs(list), hnrPaths: hnrPathsOf(list), preset: preset ?? null },
    });
  };

  const doProbe = (list: FileEntry[]) => {
    const vids = list.filter((e) => e.type === "file" && e.fileKind === "video").slice(0, 20);
    if (!vids.length) return toast.info("选中项里没有视频文件");
    probe.mutate(
      { items: refs(vids) },
      {
        onSuccess: (r) => {
          const ok = r.items.filter((i) => i.status === "ok").length;
          toast.success(`探测完成：${ok}/${r.items.length} 个读到媒体信息`, {
            description: r.items.some((i) => i.savedToAsset)
              ? "媒体信息已写入媒体库记录"
              : "未登记文件的结果缓存 24 小时",
          });
        },
        onError: (err) => toast.error(filesErrorText(err, "探测失败")),
      },
    );
  };

  const copyPaths = async (list: FileEntry[]) => {
    if (!root) return;
    const text = list.map((e) => displayPath(root, e.path)).join("\n");
    try {
      await navigator.clipboard.writeText(text);
      toast.success(`已复制 ${list.length} 个路径`);
    } catch {
      toast.error("浏览器不允许写剪贴板");
    }
  };

  const openDelete = (list: FileEntry[]) => {
    if (!root || !list.length) return;
    const blocked = list.map((e) => opDisabledReason("delete", e, root)).find(Boolean);
    if (blocked && list.length === 1) return toast.error(blocked);
    setDialog({ kind: "delete", items: refs(list) });
  };
  const openRename = (e: FileEntry) => {
    if (!root) return;
    const why = opDisabledReason("rename", e, root);
    if (why) return toast.error(why);
    setDialog({ kind: "rename", entry: e });
  };

  /** 菜单 / 行内操作的统一出口 */
  const act = (op: MenuKey, list: FileEntry[]) => {
    const e = list[0];
    if (!e) return;
    switch (op) {
      case "open":
        return open(e);
      case "organize":
        return openWizard(list);
      case "identify":
        if (list.length === 1) return patch({ sel: e.path, idf: "1" });
        return openWizard(list);
      case "rename":
        return openRename(e);
      case "move":
      case "copy":
        return setDialog({ kind: "transfer", items: refs(list), mode: op });
      case "scrape":
        return setDialog({ kind: "refresh", items: list });
      case "writeNfo":
        return setDialog({ kind: "scrape", items: list });
      case "probe":
        return doProbe(list);
      case "copyPath":
        return list.length > 1 ? void copyPaths(list) : setDialog({ kind: "copyPath", entry: e });
      case "openMedia":
        return e.asset && navigate(`/console/library/${e.asset.mediaEntityId}`);
      case "records":
        return e.asset && navigate(`/console/organize?mediaEntityId=${e.asset.mediaEntityId}`);
      case "delete":
        return openDelete(list);
    }
  };

  const menuItems = (list: FileEntry[]): MenuItem[] => {
    if (!root || !list.length) return [];
    const multi = list.length > 1;
    const e = list[0] as FileEntry;
    return menuModel(list, root).map((m) => {
      if ("separator" in m) return m;
      let label = OP_LABEL[m.key];
      if (m.key === "open") label = e.type === "dir" ? "打开" : "详情";
      if (multi && m.key === "organize") label = `整理 ${list.length} 项`;
      if (multi && m.key === "delete") label = `删除 ${list.length} 项`;
      if (m.key === "scrape") label = "刷新元数据";
      return {
        key: m.key,
        label,
        icon: MENU_ICON[m.key],
        hint: multi ? undefined : MENU_HINT[m.key],
        disabled: m.disabled,
        destructive: m.key === "delete",
        onSelect: () => act(m.key, list),
      };
    });
  };

  // 快捷键(§11):/ 搜索 · Alt+↑ 上一级 · Ctrl/⌘+Enter 整理选中项 · ? 快捷键浮层
  const keyRef = useRef<(e: KeyboardEvent) => void>(() => {});
  keyRef.current = (e: KeyboardEvent) => {
    const t = e.target as HTMLElement;
    const typing = !!t.closest("input,textarea,select,[contenteditable=true]");
    const inDialog = !!t.closest("[role=dialog],[role=alertdialog],[role=menu]");
    if (inDialog || dialog) return;
    if (e.altKey && e.key === "ArrowUp" && !typing) {
      e.preventDefault();
      e.stopPropagation();
      up();
      return;
    }
    if ((e.ctrlKey || e.metaKey) && e.key === "Enter" && !typing) {
      const list = selected.length ? selected : [];
      if (list.length) {
        e.preventDefault();
        e.stopPropagation();
        openWizard(list);
      }
      return;
    }
    if (typing || e.ctrlKey || e.metaKey || e.altKey) return;
    if (e.key === "/") {
      e.preventDefault();
      setSearchOpen(true);
      requestAnimationFrame(() => searchRef.current?.focus());
    } else if (e.key === "?") {
      e.preventDefault();
      setDialog({ kind: "shortcuts" });
    }
  };
  useEffect(() => {
    const on = (e: KeyboardEvent) => keyRef.current(e);
    window.addEventListener("keydown", on, true);
    return () => window.removeEventListener("keydown", on, true);
  }, []);

  // 拖拽:列表项 → 树节点 / 面包屑 / 列表里的目录 = 移动到(Alt 复制),一律先出预览
  const onDragRows = (e: FileEntry, ev: React.DragEvent) => {
    const k = keyOf(e);
    const list = sel.keys.has(k) ? selected : [e];
    if (!sel.keys.has(k)) setSel({ keys: new Set([k]), anchor: k, focus: k });
    dragRefs.current = refs(list);
    ev.dataTransfer.effectAllowed = "copyMove";
    ev.dataTransfer.setData(DRAG_MIME, JSON.stringify(dragRefs.current));
    ev.dataTransfer.setData("text/plain", list.map((x) => x.name).join("\n"));
  };
  const onDropTo = (target: FileRef, ev: React.DragEvent) => {
    const items = dragRefs.current;
    dragRefs.current = [];
    if (!items.length) return;
    if (items.every((i) => i.root === target.root && (i.path === target.path || parentRel(i.path) === target.path)))
      return;
    const tRoot = rootList.find((r) => r.id === target.root);
    if (!tRoot?.writable) return toast.error("只能拖到可写的媒体库目录");
    setDialog({ kind: "transfer", items, mode: ev.altKey ? "copy" : "move", target });
  };

  const clearFilters = () => {
    setQInput("");
    patch({ q: null, f: null });
  };

  const openMenuAt = (el: HTMLElement, items: MenuItem[]) => {
    const r = el.getBoundingClientRect();
    setMenu({ at: { x: r.left, y: r.bottom + 6 }, items });
  };

  // ── 左栏 ──
  const tree = (
    <div className="space-y-3">
      {roots.isPending ? <LoadingState rows={4} /> : null}
      {roots.error ? <ErrorState plain error={roots.error} onRetry={() => void roots.refetch()} /> : null}
      {rootList.length ? (
        <DirTree
          roots={rootList}
          current={root && !trashView ? { root: root.id, path } : null}
          onSelect={go}
          onDropTo={onDropTo}
        />
      ) : null}
      {roots.data && !rootList.length ? (
        <EmptyState
          plain
          icon={FolderTree}
          title="还没有登记目录"
          description="在设置里添加媒体库目录或下载器路径映射。"
          className="px-2 py-8"
        />
      ) : null}
      <button
        type="button"
        aria-current={trashView ? "location" : undefined}
        onClick={showTrash}
        className={cn(
          "flex w-full cursor-pointer items-center gap-2 rounded-lg px-2 py-1.5 text-left text-caption text-muted-foreground hover:bg-foreground/[0.04] hover:text-foreground",
          trashView && "pill-selected text-foreground",
        )}
      >
        <Trash2 className="h-4 w-4" />
        回收站
        {trashCount && trashCount !== "0" ? <span className="ml-auto tabular-nums">{trashCount}</span> : null}
      </button>
    </div>
  );

  // ── 列表区主体 ──
  const offline = list.error && isRootOffline(list.error);
  const filtered = !!(q || filter);
  let body: React.ReactNode;
  if (!root) {
    body = roots.isPending ? <LoadingState rows={8} className="p-4" /> : null;
  } else if (root.health === "offline" || offline) {
    body = (
      <div role="alert" className="flex flex-col items-center px-6 py-14 text-center">
        <span className="mb-4 grid h-11 w-11 place-items-center rounded-full bg-destructive/10 text-destructive">
          <ServerCrash className="h-5 w-5" />
        </span>
        <p className="text-lead font-medium text-foreground">{root.name} 离线</p>
        <p className="mt-1.5 max-w-md text-caption text-muted-foreground">
          {offline ? filesErrorText(list.error) : healthReasonText(root.healthReason)}。离线期间文件状态不变。
        </p>
        <p className="mt-1 text-meta text-muted-foreground">上次检查：{relTime(root.checkedAt)}</p>
        <Button
          variant="outline"
          size="sm"
          className="mt-5"
          onClick={() => {
            void roots.refetch();
            void list.refetch();
          }}
        >
          <RotateCw />
          重试
        </Button>
      </div>
    );
  } else if (list.isPending) {
    body = <LoadingState rows={10} className="p-4" />;
  } else if (list.error && !entries.length) {
    body = (
      <ErrorState
        plain
        error={new Error(filesErrorText(list.error, "读取目录失败"))}
        onRetry={() => void list.refetch()}
      />
    );
  } else if (!entries.length) {
    body = filtered ? (
      <EmptyState
        plain
        icon={SearchX}
        title="没有符合筛选的项"
        description={q ? `没有匹配「${q}」的项。支持子串和 glob，如 *.mkv` : undefined}
        action={
          <Button variant="outline" size="sm" onClick={clearFilters}>
            <X />
            清除筛选
          </Button>
        }
      />
    ) : (
      <EmptyState
        plain
        icon={FolderOpen}
        title="空目录"
        action={
          root.writable ? (
            <Button variant="outline" size="sm" onClick={() => setDialog({ kind: "mkdir" })}>
              <FolderPlus />
              新建目录
            </Button>
          ) : undefined
        }
      />
    );
  } else {
    body = (
      <FileList
        key={`${rootId}|${path}|${paged.pagination.page}|${paged.pagination.pageSize}`}
        gridRef={gridRef}
        entries={paged.items ?? []}
        keyOf={keyOf}
        selection={sel}
        onSelection={setSel}
        onOpen={open}
        onUp={up}
        onMenu={(entry, at) => setMenu({ at, items: menuItems(targets(entry)) })}
        onRename={openRename}
        onDelete={openDelete}
        onAction={(e, op) => act(op, [e])}
        opState={(e, op) => (root ? opDisabledReason(op, e, root) : null)}
        onDragRows={onDragRows}
        onDropToDir={(dir, ev) => onDropTo({ root: rootId, path: dir.path }, ev)}
        hasMore={false}
        onLoadMore={() => void list.fetchNextPage()}
        loadingMore={list.isFetchingNextPage}
        mobile={mobile}
      />
    );
  }

  // ── 批量栏 ──
  const selCount = selected.length;
  const blockedTip = (op: Parameters<typeof opDisabledReason>[0]) => {
    if (!root) return null;
    const bad = selected.map((e) => opDisabledReason(op, e, root)).filter(Boolean) as string[];
    return bad.length ? `${bad[0]}（${bad.length} 项）` : null;
  };
  const moreItems = (): MenuItem[] => {
    const items: MenuItem[] = [];
    if (mobile) items.push({ key: "copy", label: "复制到…", icon: Copy, onSelect: () => act("copy", selected) });
    if (selected.some((e) => opApplies("probe", e)))
      items.push({ key: "probe", label: "探测", icon: ScanSearch, onSelect: () => act("probe", selected) });
    items.push({
      key: "scrape",
      label: "刷新元数据",
      icon: RefreshCw,
      disabled: selected.every((e) => e.asset) ? null : "只能刷新已整理的文件",
      onSelect: () => act("scrape", selected),
    });
    items.push({
      key: "writeNfo",
      label: "刮削…",
      icon: FileDown,
      disabled: selected.every((e) => opApplies("writeNfo", e)) ? blockedTip("writeNfo") : "只能刮削视频文件或目录",
      onSelect: () => act("writeNfo", selected),
    });
    items.push({ key: "copyPath", label: "复制路径", icon: ClipboardCopy, onSelect: () => void copyPaths(selected) });
    return items;
  };
  const organizeTip = !selected.some((e) => opApplies("identify", e))
    ? "只有视频或目录能整理"
    : (() => {
        const bad = selected
          .filter((e) => opApplies("identify", e))
          .map((e) => (root ? opDisabledReason("organize", e, root) : null))
          .filter(Boolean) as string[];
        return bad.length ? `${bad[0]}（${bad.length} 项）` : null;
      })();
  const moveTip = blockedTip("move");
  const deleteTip = blockedTip("delete");
  const actionBar =
    selCount > 0 && root ? (
      <div
        className={cn(
          "pg-float z-30 flex items-center gap-1.5 overflow-x-auto rounded-full px-2 py-1.5 scroll-bleed",
          mobile
            ? "fixed right-3 bottom-3 left-3"
            : "absolute bottom-12 left-1/2 max-w-[calc(100%-2rem)] -translate-x-1/2",
        )}
        role="toolbar"
        aria-label="批量操作"
      >
        <span className="shrink-0 px-2 text-caption whitespace-nowrap">
          已选 {selCount}
          {totalSize(selected) ? ` · ${formatBytes(totalSize(selected), 1)}` : ""}
        </span>
        <span title={organizeTip ?? undefined}>
          <Button size="sm" onClick={() => openWizard(selected)} disabled={!!organizeTip}>
            <Wand2 />
            整理
          </Button>
        </span>
        <span title={moveTip ?? undefined}>
          <Button size="sm" variant="outline" onClick={() => act("move", selected)} disabled={!!moveTip}>
            <FolderInput />
            移动
          </Button>
        </span>
        {!mobile ? (
          <Button size="sm" variant="outline" onClick={() => act("copy", selected)}>
            <Copy />
            复制
          </Button>
        ) : null}
        <Button size="sm" variant="outline" onClick={(ev) => openMenuAt(ev.currentTarget, moreItems())}>
          <MoreHorizontal />
          更多
        </Button>
        <span title={deleteTip ?? undefined}>
          <Button size="sm" variant="destructive" onClick={() => openDelete(selected)} disabled={!!deleteTip}>
            <Trash2 />
            删除
          </Button>
        </span>
        <Button size="icon-sm" variant="ghost" aria-label="清除选择" onClick={() => setSel(emptySelection())}>
          <X />
        </Button>
      </div>
    ) : null;

  // ── 工具栏 ──
  const chips = (
    <div className="min-w-0 overflow-x-auto scroll-bleed">
      <SegmentedControl
        label="筛选"
        size="xs"
        value={filter || "all"}
        onChange={(v) => patch({ f: v === "all" ? null : v })}
        options={FILTER_CHIPS.map((c) => ({ value: c.value || "all", label: c.label }))}
      />
    </div>
  );
  const searchBox = (
    <div className="relative w-full sm:w-60">
      <Search className="pointer-events-none absolute top-1/2 left-3 h-4 w-4 -translate-y-1/2 text-muted-foreground" />
      <Input
        ref={searchRef}
        value={qInput}
        onChange={(e) => setQInput(e.target.value)}
        onKeyDown={(e) => {
          if (e.key === "Escape") {
            setQInput("");
            setSearchOpen(false);
            gridRef.current?.focus();
          }
          if (e.key === "ArrowDown") gridRef.current?.focus();
        }}
        placeholder="名称或 glob，如 *.mkv"
        aria-label="搜索当前目录"
        className="h-8 pl-9"
      />
    </div>
  );
  const sortControls = (
    <div className="flex items-center gap-2">
      <Select value={sort} onValueChange={(v) => patch({ sort: v === "name" ? null : v })}>
        <SelectTrigger size="sm" aria-label="排序" className="min-w-28 text-caption">
          <SelectValue />
        </SelectTrigger>
        <SelectContent position="popper" align="end">
          {SORT_OPTIONS.map((o) => (
            <SelectItem key={o.value} value={o.value}>
              按{o.label}
            </SelectItem>
          ))}
        </SelectContent>
      </Select>
      <Button
        variant="outline"
        size="icon-sm"
        aria-label={order === "asc" ? "升序，切换为降序" : "降序，切换为升序"}
        title={order === "asc" ? "升序" : "降序"}
        onClick={() => patch({ order: order === "asc" ? "desc" : null })}
      >
        {order === "asc" ? <ArrowDownAZ /> : <ArrowUpAZ />}
      </Button>
      <Button
        variant="outline"
        size="icon-sm"
        aria-pressed={hidden}
        aria-label={hidden ? "不显示隐藏文件" : "显示隐藏文件"}
        title={hidden ? "正在显示隐藏文件" : "显示隐藏文件"}
        onClick={() => patch({ hidden: hidden ? null : "1" })}
      >
        {hidden ? <Eye /> : <EyeOff />}
      </Button>
    </div>
  );
  const mobileMore = (): MenuItem[] => [
    ...SORT_OPTIONS.map((o) => ({
      key: `sort-${o.value}`,
      label: `按${o.label}${sort === o.value ? " ✓" : ""}`,
      onSelect: () => patch({ sort: o.value === "name" ? null : o.value }),
    })),
    {
      key: "order",
      label: order === "asc" ? "改为降序" : "改为升序",
      icon: order === "asc" ? ArrowUpAZ : ArrowDownAZ,
      onSelect: () => patch({ order: order === "asc" ? "desc" : null }),
    },
    {
      key: "hidden",
      label: hidden ? "不显示隐藏文件" : "显示隐藏文件",
      icon: hidden ? EyeOff : Eye,
      onSelect: () => patch({ hidden: hidden ? null : "1" }),
    },
    { key: "sep", separator: true },
    {
      key: "mkdir",
      label: "新建目录",
      icon: FolderPlus,
      disabled: root?.writable ? null : root?.kind === "download" ? "下载目录里不能新建目录" : "只读目录，不能新建",
      onSelect: () => setDialog({ kind: "mkdir" }),
    },
    {
      key: "trash",
      label: `回收站${trashCount && trashCount !== "0" ? ` ${trashCount}` : ""}`,
      icon: Trash2,
      onSelect: showTrash,
    },
  ];

  return (
    <>
      {/* 顶栏已显示页面名,这里只给读屏留标题,把高度让给列表 */}
      <h1 className="sr-only">文件管理</h1>
      <div className={cn("flex h-[calc(100dvh-3.5rem)] min-w-0 gap-3 p-3", mobile && "flex-col")}>
        {/* 桌面左栏:与主面板同款的圆角卡片(同背景、边框、圆角),上下与主面板对齐;可折叠、可拖宽,宽度记在本机 */}
        {!mobile ? (
          <aside
            className="relative flex shrink-0"
            style={{ width: treeOpen ? treeW : 52 }}
            aria-label="登记目录与目录树"
          >
            <div className="pg-slab pg-slab-solid flex min-h-0 w-full flex-col overflow-hidden rounded-2xl">
              {treeOpen ? (
                <>
                  {/* 头部一行与主面板工具栏第一行等高(同 px-3 py-2.5 + 按钮高度) */}
                  <div className="flex shrink-0 items-center gap-1.5 px-3 py-2.5">
                    <Button
                      variant="ghost"
                      size="icon-sm"
                      aria-label="折叠目录树"
                      title="折叠目录树"
                      onClick={() => setTreeOpenStored(false)}
                    >
                      <PanelLeftClose />
                    </Button>
                    <span className="min-w-0 flex-1 truncate text-sm font-medium text-foreground">目录</span>
                    {filesMockEnabled() ? <StatusBadge tone="warning">演示数据</StatusBadge> : null}
                  </div>
                  <div className="min-h-0 flex-1 overflow-y-auto px-2 pb-2">{tree}</div>
                </>
              ) : (
                <TreeRail
                  roots={rootList}
                  current={rootId}
                  onSelect={go}
                  onExpand={() => setTreeOpenStored(true)}
                  trashCount={trashCount}
                  trashOpen={trashView}
                  onTrash={showTrash}
                />
              )}
            </div>
            {treeOpen ? (
              // biome-ignore lint/a11y/useSemanticElements: 可拖动、可键盘调整的分隔条,hr 不能获焦
              <div
                role="separator"
                aria-orientation="vertical"
                aria-label="调整目录树宽度"
                title="拖动调整宽度，双击恢复默认"
                aria-valuenow={treeW}
                aria-valuemin={TREE_W_MIN}
                aria-valuemax={TREE_W_MAX}
                tabIndex={0}
                onKeyDown={(e) => {
                  if (e.key === "ArrowLeft") setTreeW(treeW - 16);
                  if (e.key === "ArrowRight") setTreeW(treeW + 16);
                }}
                onDoubleClick={() => setTreeW(TREE_W_DEFAULT)}
                onPointerDown={(e) => {
                  e.preventDefault();
                  const startX = e.clientX;
                  const startW = treeW;
                  const move = (ev: PointerEvent) => setTreeW(startW + ev.clientX - startX);
                  const upH = () => {
                    window.removeEventListener("pointermove", move);
                    window.removeEventListener("pointerup", upH);
                  };
                  window.addEventListener("pointermove", move);
                  window.addEventListener("pointerup", upH);
                }}
                // 放在两张卡片之间的缝里
                className="absolute inset-y-3 -right-2.5 z-10 w-2 cursor-col-resize rounded-full hover:bg-foreground/[0.08] focus-visible:bg-foreground/[0.12] focus-visible:outline-none"
              />
            ) : null}
          </aside>
        ) : null}

        {trashView ? (
          <section
            className="pg-slab pg-slab-solid relative flex min-h-[24rem] min-w-0 flex-1 flex-col overflow-y-auto rounded-2xl p-3 md:p-4"
            aria-label="回收站"
          >
            <TrashView
              leading={
                mobile ? (
                  <Button variant="outline" size="icon-sm" aria-label="目录" onClick={() => setTreeSheet(true)}>
                    <FolderTree />
                  </Button>
                ) : null
              }
            />
          </section>
        ) : (
          <section
            className="pg-slab pg-slab-solid relative flex min-h-[24rem] min-w-0 flex-1 flex-col overflow-hidden rounded-2xl"
            aria-label="目录内容"
          >
            {/* 工具栏 */}
            {mobile ? (
              <div className="space-y-2 border-b border-border px-3 py-2">
                <div className="flex min-w-0 items-center gap-1.5">
                  <Button variant="outline" size="icon-sm" aria-label="目录" onClick={() => setTreeSheet(true)}>
                    <FolderTree />
                  </Button>
                  {searchOpen ? (
                    <div className="min-w-0 flex-1">{searchBox}</div>
                  ) : root ? (
                    <PathBreadcrumb
                      root={root}
                      path={path}
                      onNavigate={(p) => go({ root: root.id, path: p })}
                      className="min-w-0 flex-1"
                    />
                  ) : (
                    <span className="flex-1" />
                  )}
                  <Button
                    variant="outline"
                    size="icon-sm"
                    aria-label={searchOpen ? "收起搜索" : "搜索"}
                    onClick={() => {
                      setSearchOpen((v) => !v);
                      if (!searchOpen) requestAnimationFrame(() => searchRef.current?.focus());
                    }}
                  >
                    {searchOpen ? <X /> : <Search />}
                  </Button>
                  <Button
                    variant="outline"
                    size="icon-sm"
                    aria-label="更多"
                    onClick={(ev) => openMenuAt(ev.currentTarget, mobileMore())}
                  >
                    <MoreHorizontal />
                  </Button>
                </div>
                {chips}
              </div>
            ) : (
              <div className="space-y-2 border-b border-border px-3 py-2.5">
                <div className="flex min-w-0 items-center gap-1.5">
                  <Button
                    variant="outline"
                    size="icon-sm"
                    aria-label="上一级"
                    title="上一级(Alt+↑)"
                    disabled={!path}
                    onClick={up}
                  >
                    <ArrowUp />
                  </Button>
                  {root ? (
                    <PathBreadcrumb
                      root={root}
                      path={path}
                      onNavigate={(p) => go({ root: root.id, path: p })}
                      onDropTo={(p, ev) => onDropTo({ root: root.id, path: p }, ev)}
                      className="min-w-0 flex-1"
                    />
                  ) : (
                    <span className="flex-1" />
                  )}
                  <Button
                    variant="outline"
                    size="icon-sm"
                    aria-label="刷新"
                    title="刷新"
                    onClick={async () => {
                      // Alist:手动刷新才让 Alist 刷新目录缓存(穿透到网盘接口)
                      if (root?.storage) await refreshRemoteDir(root.id, path).catch(() => undefined);
                      void roots.refetch();
                      void list.refetch();
                    }}
                  >
                    <RotateCw className={cn(list.isFetching && !list.isFetchingNextPage && "animate-spin")} />
                  </Button>
                  <Button
                    variant="outline"
                    size="icon-sm"
                    aria-label="快捷键"
                    title="快捷键(?)"
                    onClick={() => setDialog({ kind: "shortcuts" })}
                  >
                    <Keyboard />
                  </Button>
                  <span
                    title={
                      root?.writable
                        ? undefined
                        : root?.kind === "download"
                          ? "下载目录里不能新建目录"
                          : "只读目录，不能新建"
                    }
                  >
                    <Button
                      variant="outline"
                      size="sm"
                      disabled={!root?.writable}
                      onClick={() => setDialog({ kind: "mkdir" })}
                    >
                      <FolderPlus />
                      新建目录
                    </Button>
                  </span>
                  {root ? <UploadButton root={root} path={path} /> : null}
                </div>
                <div className="flex flex-wrap items-center gap-2">
                  {searchBox}
                  {chips}
                  <div className="ml-auto">{sortControls}</div>
                </div>
              </div>
            )}

            {first?.truncated ? (
              <div
                role="status"
                className="border-b border-warning/30 bg-warning/10 px-3 py-1.5 text-meta text-warning"
              >
                目录过大，只读了前 {first.total.toLocaleString("zh-CN")} 项。用搜索或进入子目录。
              </div>
            ) : null}

            <div className="relative flex min-h-0 flex-1 flex-col">{body}</div>
            {!list.isPending && root ? <Pagination {...paged.pagination} /> : null}

            {/* 状态栏 */}
            {root && !offline && root.health !== "offline" && !mobile ? (
              <div className="flex items-center gap-3 border-t border-border px-3 py-1.5 text-meta text-muted-foreground">
                <span>
                  {first ? `${entries.length.toLocaleString("zh-CN")}/${first.total.toLocaleString("zh-CN")} 项` : "—"}
                </span>
                {selCount ? (
                  <span>
                    已选 {selCount}
                    {totalSize(selected) ? ` · ${formatBytes(totalSize(selected), 1)}` : ""}
                  </span>
                ) : null}
                {/* 靠左排:右下角是 Agent 悬浮按钮(QA U6) */}
                {root.usage ? <span>剩余 {formatBytes(root.usage.freeBytes, 1)}</span> : null}
                {!root.writable && root.kind === "library" ? <StatusBadge>只读</StatusBadge> : null}
              </div>
            ) : null}
            {!mobile ? actionBar : null}
          </section>
        )}
      </div>
      {mobile && !trashView ? actionBar : null}

      {/* 手机:登记目录与目录树收进左侧抽屉 */}
      <Sheet open={treeSheet} onOpenChange={setTreeSheet}>
        <SheetContent side="left" className="w-[85vw] gap-0 p-0 sm:max-w-sm">
          <SheetHeader className="border-b border-[var(--shell-border)] px-4 py-3">
            <SheetTitle>目录</SheetTitle>
          </SheetHeader>
          <div className="min-h-0 flex-1 overflow-y-auto p-2.5">{tree}</div>
        </SheetContent>
      </Sheet>

      <ContextMenu anchor={menu?.at ?? null} items={menu?.items ?? []} onClose={() => setMenu(null)} />

      {detail && root && !trashView ? (
        <FileDetail
          root={root}
          entry={detail}
          identifyAuto={identifyAuto}
          onOrganize={(preset) => openWizard([detail], preset)}
          onClose={() => patch({ sel: null, idf: null })}
          actions={
            <>
              {opApplies("organize", detail) ? (
                <Button
                  size="sm"
                  onClick={() => openWizard([detail])}
                  disabled={!!opDisabledReason("organize", detail, root)}
                >
                  <Wand2 />
                  整理
                </Button>
              ) : null}
              {detail.asset ? (
                <Button size="sm" variant="outline" onClick={() => act("scrape", [detail])}>
                  <RefreshCw />
                  刷新元数据
                </Button>
              ) : null}
              {opApplies("writeNfo", detail) ? (
                <Button
                  size="sm"
                  variant="outline"
                  onClick={() => act("writeNfo", [detail])}
                  disabled={!!opDisabledReason("writeNfo", detail, root)}
                  title={opDisabledReason("writeNfo", detail, root) ?? undefined}
                >
                  <FileDown />
                  刮削
                </Button>
              ) : null}
              <Button
                variant="outline"
                size="sm"
                onClick={() => openRename(detail)}
                disabled={!!opDisabledReason("rename", detail, root)}
                title={opDisabledReason("rename", detail, root) ?? undefined}
              >
                <PenLine />
                重命名
              </Button>
              <Button
                variant="outline"
                size="sm"
                onClick={() => act("move", [detail])}
                disabled={!!opDisabledReason("move", detail, root)}
                title={opDisabledReason("move", detail, root) ?? undefined}
              >
                <FolderInput />
                移动
              </Button>
              <Button
                variant="destructive"
                size="sm"
                onClick={() => openDelete([detail])}
                disabled={!!opDisabledReason("delete", detail, root)}
                title={opDisabledReason("delete", detail, root) ?? undefined}
              >
                <Trash2 />
                删除
              </Button>
            </>
          }
        />
      ) : null}

      {dialog?.kind === "rename" && root ? (
        <RenameDialog
          root={root}
          entry={dialog.entry}
          siblings={entries.map((e) => e.name)}
          onClose={() => setDialog(null)}
        />
      ) : null}
      {dialog?.kind === "transfer" ? (
        <TransferDialog
          roots={rootList}
          items={dialog.items}
          initialMode={dialog.mode}
          initialTarget={dialog.target}
          onClose={() => setDialog(null)}
        />
      ) : null}
      {dialog?.kind === "delete" ? (
        <DeleteDialog roots={rootList} items={dialog.items} isAdmin={isAdmin} onClose={() => setDialog(null)} />
      ) : null}
      {root ? (
        <MkdirDialog
          root={root}
          path={path}
          open={dialog?.kind === "mkdir"}
          onOpenChange={(o) => !o && setDialog(null)}
        />
      ) : null}
      {dialog?.kind === "copyPath" && root ? (
        <CopyPathDialog root={root} entry={dialog.entry} onClose={() => setDialog(null)} />
      ) : null}
      {dialog?.kind === "refresh" ? (
        <RefreshMetadataDialog items={dialog.items} onClose={() => setDialog(null)} />
      ) : null}
      {dialog?.kind === "scrape" && root ? (
        <ScrapeDialog items={dialog.items} root={root} onClose={() => setDialog(null)} />
      ) : null}
      {dialog?.kind === "wizard" ? <OrganizeWizard source={dialog.source} onClose={() => setDialog(null)} /> : null}
      <ShortcutsDialog open={dialog?.kind === "shortcuts"} onOpenChange={(o) => !o && setDialog(null)} />
    </>
  );
}