mnote/wolai-frontend/src/components/editor/document-content.tsx

"use client";

import dynamic from "next/dynamic";
import { useCallback, useEffect, useMemo, useRef, useState, type ChangeEvent, type KeyboardEvent as ReactKeyboardEvent } from "react";
import type { BooleanPageOptionKey, DocumentStats, PageOptionsState, PageFont, PageLayoutDensity } from "@/types/page-options";
import { PageOptionsSidebar } from "@/components/editor/page-options-sidebar";
import { PageBacklinksPanel } from "@/components/editor/page-backlinks-panel";
import { useEditorBridgeStore } from "@/store/editor-bridge";
import { usePageLayoutStore } from "@/store/page-layout";
import { useCurrentDocumentStore } from "@/store/current-document";
import type { Json } from "@/types/supabase";
import { DocumentHistoryDrawer } from "@/components/editor/document-history-drawer";
import { DocumentCommentsDrawer } from "@/components/editor/document-comments-drawer";
import type { DocumentSnapshot } from "@/types/document";
import { useDebouncedCallback } from "@/hooks/use-debounced-callback";
import { ImagePickerProvider } from "@/components/media/image-picker-context";
import { useRouter } from "next/navigation";
import { DocumentAiAgentPanel } from "./DocumentAiAgentPanel";
import { CONTENT_LOADING_DELAY_MS } from "@/lib/constants";
import { useCommentsUiStore } from "@/store/comments-ui";
import { useAppPreferencesStore } from "@/store/app-preferences";
import { useMoveEmbedPickerStore } from "@/store/move-embed-picker";
import { cn } from "@/lib/utils";

const BlockNoteEditor = dynamic(
  () => import("@/components/editor/blocknote-editor").then((mod) => mod.BlockNoteEditor),
  {
    ssr: false,
    loading: () => (
      <div className="flex h-64 items-center justify-center text-sm text-gray-400">编辑器加载中...</div>
    ),
  },
);

export interface DocumentContentProps {
  documentId: string;
  workspaceId: string;
  title: string | null;
  updatedAt: string | null;
  initialContent: unknown;
  initialOptions: PageOptionsState;
  initialStats: DocumentStats | null;
  openTableId?: string | null;
  readOnly?: boolean;
  disableDownload?: boolean;
  disableCopy?: boolean;
}

const defaultOptions: PageOptionsState = {
  wideLayout: false,
  smallText: false,
  showHeadingNumbers: true,
  showToc: false,
  showStructure: false,
  protectEditing: false,
  showWordCount: true,
  collapseBacklinks: false,
  pageFont: "default",
  layoutDensity: "normal",
  hideChildPages: false,
  showBlockRefCount: false,
  embedDefaultBlockId: null,
};
const defaultStats: DocumentStats = { wordCount: 0, characterCount: 0, blockCount: 0, todoTotal: 0, todoDone: 0 };

export function DocumentContent({
  documentId,
  workspaceId,
  title,
  updatedAt,
  initialContent,
  initialOptions,
  initialStats,
  openTableId,
  readOnly = false,
  disableDownload = false,
  disableCopy = false,
}: DocumentContentProps) {
  const setCurrentDocument = useCurrentDocumentStore((state) => state.setCurrent);
  const clearIfMatch = useCurrentDocumentStore((state) => state.clearIfMatch);
  const [options, setOptions] = useState<PageOptionsState>(initialOptions ?? defaultOptions);
  const [stats, setStats] = useState<DocumentStats>(initialStats ?? defaultStats);
  const [history, setHistory] = useState<DocumentSnapshot[]>([]);
  const [historyOpen, setHistoryOpen] = useState(false);
  const editorBridge = useEditorBridgeStore((state) => state.bridge);
  const router = useRouter();
  const showInspector = usePageLayoutStore((state) => state.showInspector);
  const openCommentsForPage = useCommentsUiStore((s) => s.openForPage);
  const spellCheck = useAppPreferencesStore((s) => s.spellCheck);
  const openMoveEmbedPicker = useMoveEmbedPickerStore((s) => s.openPicker);
  const [pageTitle, setPageTitle] = useState(title ?? "无标题");
  const [content, setContent] = useState<unknown>(initialContent);
  const [contentLoading, setContentLoading] = useState(() => initialContent == null);
  const [contentError, setContentError] = useState<string | null>(null);
  const [contentReloadKey, setContentReloadKey] = useState(0);
  const [showContentLoadingIndicator, setShowContentLoadingIndicator] = useState(false);
  const contentLoadingTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
  const pendingOpenTableRef = useRef<string | null>(null);
  const latestBlocksRef = useRef<Json | null>(null);
  const pageRootRef = useRef<HTMLDivElement>(null);
  const lastCopyBlockedAtRef = useRef<number>(0);

  useEffect(() => {
    setCurrentDocument(documentId, readOnly, disableDownload, disableCopy);
    return () => {
      clearIfMatch(documentId);
    };
  }, [clearIfMatch, disableCopy, disableDownload, documentId, readOnly, setCurrentDocument]);

  useEffect(() => {
    if (!disableCopy) return;

    const isEventInsidePage = () => {
      const root = pageRootRef.current;
      if (!root) return false;
      const selection = typeof window !== "undefined" ? window.getSelection() : null;
      const anchor = selection?.anchorNode ?? null;
      const focus = selection?.focusNode ?? null;
      const anchorEl =
        anchor && "nodeType" in anchor && anchor.nodeType === Node.TEXT_NODE
          ? anchor.parentElement
          : (anchor as any as Element | null);
      const focusEl =
        focus && "nodeType" in focus && focus.nodeType === Node.TEXT_NODE
          ? focus.parentElement
          : (focus as any as Element | null);
      return Boolean((anchorEl && root.contains(anchorEl)) || (focusEl && root.contains(focusEl)));
    };

    const notifyBlocked = () => {
      const now = Date.now();
      if (now - lastCopyBlockedAtRef.current < 1200) return;
      lastCopyBlockedAtRef.current = now;
      window.alert("该页面已禁止复制");
    };

    const onCopy = (event: ClipboardEvent) => {
      if (!isEventInsidePage()) return;
      event.preventDefault();
      event.stopPropagation();
      notifyBlocked();
    };

    const onCut = (event: ClipboardEvent) => {
      if (!isEventInsidePage()) return;
      event.preventDefault();
      event.stopPropagation();
      notifyBlocked();
    };

    const onKeyDown = (event: KeyboardEvent) => {
      if (!isEventInsidePage()) return;
      const key = String(event.key ?? "").toLowerCase();
      const ctrlOrMeta = event.ctrlKey || event.metaKey;
      if (!ctrlOrMeta) return;
      if (key === "c" || key === "x" || key === "insert") {
        event.preventDefault();
        event.stopPropagation();
        notifyBlocked();
      }
    };

    document.addEventListener("copy", onCopy, true);
    document.addEventListener("cut", onCut, true);
    document.addEventListener("keydown", onKeyDown, true);
    return () => {
      document.removeEventListener("copy", onCopy, true);
      document.removeEventListener("cut", onCut, true);
      document.removeEventListener("keydown", onKeyDown, true);
    };
  }, [disableCopy]);

  useEffect(() => {
    const tableId = (openTableId ?? "").trim();
    if (!tableId) return;
    if (!editorBridge?.openTableFullScreen) return;
    if (pendingOpenTableRef.current === tableId) return;
    pendingOpenTableRef.current = tableId;

    editorBridge.openTableFullScreen(tableId);

    // 清理 URL 参数，避免刷新/回退时重复触发
    if (typeof window !== "undefined") {
      try {
        const url = new URL(window.location.href);
        url.searchParams.delete("openTableId");
        window.history.replaceState({}, "", url.toString());
      } catch {
        // fallback：不影响主流程
        router.replace(`/documents/${documentId}`);
      }
    }
  }, [documentId, editorBridge, openTableId, router]);

   
  useEffect(() => {
    setPageTitle(title ?? "无标题");
  }, [title]);

  useEffect(() => {
    setOptions(initialOptions ?? defaultOptions);
  }, [initialOptions]);

  useEffect(() => {
    setStats(initialStats ?? defaultStats);
  }, [initialStats]);
   

  useEffect(() => {
    let canceled = false;
    const controller = new AbortController();

    const load = async () => {
      setContentError(null);
      setContentLoading(initialContent == null);
      setContent(initialContent);
      setShowContentLoadingIndicator(false);

      if (initialContent != null) {
        return;
      }

      if (contentLoadingTimerRef.current) {
        clearTimeout(contentLoadingTimerRef.current);
        contentLoadingTimerRef.current = null;
      }
      // 避免"秒闪"的加载提示：只有当加载超过短阈值时才显示提示
      contentLoadingTimerRef.current = setTimeout(() => {
        if (!canceled) {
          setShowContentLoadingIndicator(true);
        }
      }, CONTENT_LOADING_DELAY_MS);

      try {
        const response = await fetch(
          `/api/documents/content?documentId=${encodeURIComponent(documentId)}&workspaceId=${encodeURIComponent(workspaceId)}`,
          {
          method: "GET",
          credentials: "include",
          signal: controller.signal,
          },
        );
        if (!response.ok) {
          const payload = await response.json().catch(() => ({}));
          throw new Error(payload?.error ?? "加载页面内容失败");
        }
        const payload = (await response.json()) as { content?: unknown };
        if (canceled) return;
        setContent(payload.content ?? null);
      } catch (error) {
        if (canceled) return;
        if ((error as { name?: string })?.name === "AbortError") return;
        setContentError(error instanceof Error ? error.message : "加载页面内容失败");
      } finally {
        if (!canceled) {
          setContentLoading(false);
          setShowContentLoadingIndicator(false);
        }
        if (contentLoadingTimerRef.current) {
          clearTimeout(contentLoadingTimerRef.current);
          contentLoadingTimerRef.current = null;
        }
      }
    };

    void load();

    return () => {
      canceled = true;
      controller.abort();
      if (contentLoadingTimerRef.current) {
        clearTimeout(contentLoadingTimerRef.current);
        contentLoadingTimerRef.current = null;
      }
    };
  }, [documentId, initialContent, contentReloadKey, workspaceId]);

  const persistTitle = useCallback(
    async (nextTitle: string) => {
      if (readOnly) return;
      const payload = nextTitle.trim() || "无标题";
      await fetch("/api/documents/title", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ documentId, workspaceId, title: payload }),
      });
    },
    [documentId, readOnly, workspaceId],
  );

  const debouncedPersistTitle = useDebouncedCallback((value: string) => {
    void persistTitle(value);
  }, 600);

  const handleTitleChange = (event: ChangeEvent<HTMLInputElement>) => {
    if (readOnly) return;
    const value = event.target.value;
    setPageTitle(value);
    debouncedPersistTitle(value);
  };

  const handleTitleBlur = () => {
    if (readOnly) return;
    void persistTitle(pageTitle);
  };

  const handleTitleKeyDown = (event: ReactKeyboardEvent<HTMLInputElement>) => {
    if (event.key === "Enter") {
      event.preventDefault();
      event.currentTarget.blur();
    }
  };

  const persistOptions = useCallback(
    async (patch: Partial<PageOptionsState>) => {
      if (readOnly) return;
      try {
        const response = await fetch("/api/documents/options", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ documentId, workspaceId, options: patch }),
        });
        if (!response.ok) {
          const payload = await response.json().catch(() => null);
          console.error(payload?.error ?? "更新页面选项失败");
        }
      } catch (error) {
        console.error(error);
      }
    },
    [documentId, readOnly, workspaceId],
  );

  const toggleOption = useCallback(
    (key: BooleanPageOptionKey) => {
      if (readOnly) return;
      setOptions((prev) => {
        const nextValue = !prev[key];
        const next = { ...prev, [key]: nextValue };
        void persistOptions({ [key]: nextValue } as Partial<PageOptionsState>);
        return next;
      });
    },
    [persistOptions, readOnly],
  );

  const setOptionPatch = useCallback(
    (patch: Partial<PageOptionsState>) => {
      if (readOnly) return;
      setOptions((prev) => {
        const next = { ...prev, ...patch };
        void persistOptions(patch);
        return next;
      });
    },
    [persistOptions, readOnly],
  );

  const closeToc = useCallback(() => {
    if (readOnly) return;
    setOptions((prev) => {
      if (!prev.showToc) return prev;
      const next = { ...prev, showToc: false };
      void persistOptions({ showToc: false });
      return next;
    });
  }, [persistOptions, readOnly]);

  const handleSetPageFont = useCallback(
    (font: PageFont) => {
      setOptionPatch({ pageFont: font });
    },
    [setOptionPatch],
  );

  const handleSetLayoutDensity = useCallback(
    (density: PageLayoutDensity) => {
      setOptionPatch({ layoutDensity: density });
    },
    [setOptionPatch],
  );

  const handleSetEmbedDefaultToCursor = useCallback(() => {
    if (readOnly) return;
    const blockId = editorBridge?.getCursorBlockId?.() ?? null;
    if (!blockId) {
      window.alert("未找到当前光标所在块，请先在编辑器中点击任意块");
      return;
    }
    setOptionPatch({ embedDefaultBlockId: blockId });
    window.alert("已设置“嵌入默认位置”");
  }, [editorBridge, readOnly, setOptionPatch]);

  const handleClearEmbedDefault = useCallback(() => {
    if (readOnly) return;
    setOptionPatch({ embedDefaultBlockId: null });
    window.alert("已清除“嵌入默认位置”");
  }, [readOnly, setOptionPatch]);

  useEffect(() => {
    const onKeyDown = (event: KeyboardEvent) => {
      const root = pageRootRef.current;
      if (root) {
        const target = event.target;
        if (target && target instanceof Node && !root.contains(target)) {
          return;
        }
      }
      const ctrlOrMeta = event.ctrlKey || event.metaKey;
      if (!ctrlOrMeta) return;
      if (!event.shiftKey) return;
      const key = String(event.key ?? "").toLowerCase();
      if (key === "l") {
        event.preventDefault();
        toggleOption("showToc");
      } else if (key === "c") {
        event.preventDefault();
        toggleOption("protectEditing");
      }
    };
    window.addEventListener("keydown", onKeyDown);
    return () => window.removeEventListener("keydown", onKeyDown);
  }, [toggleOption]);

  const buildDocumentUrl = useCallback((id: string): string => {
    if (typeof window === "undefined" || !window.location) {
      return `/documents/${id}`;
    }
    return `${window.location.origin}/documents/${id}`;
  }, []);

  const copyText = useCallback(async (text: string, successMessage: string) => {
    if (typeof navigator !== "undefined" && navigator.clipboard) {
      try {
        await navigator.clipboard.writeText(text);
        window.alert(successMessage);
        return;
      } catch {
        // ignore and fallback
      }
    }
    window.prompt("复制失败，请手动复制内容", text);
  }, []);

  const handleCopyPageLink = useCallback(
    async (includeTitle: boolean) => {
      const url = buildDocumentUrl(documentId);
      if (includeTitle) {
        const text = `${pageTitle || "无标题"}\n${url}`;
        await copyText(text, "标题 + 链接已复制");
        return;
      }
      await copyText(url, "页面链接已复制");
    },
    [buildDocumentUrl, copyText, documentId, pageTitle],
  );

  const handleCopyPageReference = useCallback(
    async (mode: "inline" | "embed") => {
      const template = mode === "inline" ? `((${documentId}))` : `{{${documentId}}}`;
      await copyText(template, mode === "inline" ? "行内引用已复制" : "嵌入引用已复制");
    },
    [copyText, documentId],
  );

  const handleUndo = useCallback(() => {
    editorBridge?.undo?.();
  }, [editorBridge]);

  const handleRedo = useCallback(() => {
    editorBridge?.redo?.();
  }, [editorBridge]);

  const handleDeletePage = useCallback(async () => {
    if (readOnly) return;
    const ok = window.confirm("确定删除该页面吗？删除后会进入垃圾桶。");
    if (!ok) return;
    const resp = await fetch("/api/documents/delete", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ documentId }),
    });
    if (!resp.ok) {
      const payload = await resp.json().catch(() => ({}));
      window.alert(payload?.error ?? "删除失败");
      return;
    }
    router.push("/");
    router.refresh();
  }, [documentId, readOnly, router]);

  const handleOpenMoveEmbed = useCallback(() => {
    if (readOnly) return;
    openMoveEmbedPicker({
      workspaceId,
      defaultMode: "move",
      modes: ["move", "embed"],
      allowRoot: true,
      excludeIds: [documentId],
      onPick: async (mode, targetId) => {
        if (mode === "move") {
          const resp = await fetch("/api/documents/move", {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify({ documentId, parentId: targetId ?? null, position: 999999 }),
          });
          if (!resp.ok) {
            const payload = await resp.json().catch(() => ({}));
            window.alert(payload?.error ?? "移动失败");
            return;
          }
          window.alert("移动成功");
          router.refresh();
          return;
        }

        const resp = await fetch("/api/documents/embed", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ sourceId: documentId, targetId }),
        });
        if (!resp.ok) {
          const payload = await resp.json().catch(() => ({}));
          window.alert(payload?.error ?? "嵌入失败");
          return;
        }
        window.alert("已嵌入到目标页面");
      },
    });
  }, [documentId, openMoveEmbedPicker, readOnly, router, workspaceId]);

  const handleAddToTemplates = useCallback(async () => {
    if (readOnly) return;
    const ok = window.confirm("将该页面添加为模板？");
    if (!ok) return;
    const resp = await fetch("/api/documents/template", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ documentId, isTemplate: true }),
    });
    if (!resp.ok) {
      const payload = await resp.json().catch(() => ({}));
      window.alert(payload?.error ?? "设置模板失败");
      return;
    }
    window.alert("已添加为模板");
    router.refresh();
  }, [documentId, readOnly, router]);

  const formattedUpdatedAt = useMemo(() => {
    if (!updatedAt) return "";
    return new Date(updatedAt).toLocaleString();
  }, [updatedAt]);

  const handleExport = useCallback(() => {
    if (disableDownload) {
      window.alert("该页面已禁止下载");
      return;
    }
    const latest = history[0];
    if (!latest) {
      window.alert("暂无可导出的内容");
      return;
    }
    const payload = JSON.stringify(latest.blocks, null, 2);
    const blob = new Blob([payload], { type: "application/json" });
    const url = URL.createObjectURL(blob);
    const anchor = document.createElement("a");
    anchor.href = url;
    anchor.download = `${title ?? "未命名页面"}-${new Date(latest.timestamp).toISOString()}.json`;
    anchor.click();
    URL.revokeObjectURL(url);
  }, [disableDownload, history, title]);

  const pageRootClass = cn(
    "flex h-full overflow-hidden bg-wolai-bg",
    options.pageFont === "song" && "wolai-page-font-song",
    options.pageFont === "kai" && "wolai-page-font-kai",
    options.layoutDensity === "compact" && "wolai-page-density-compact",
    options.layoutDensity === "spacious" && "wolai-page-density-spacious",
    options.smallText && "wolai-small-text",
    options.hideChildPages && "wolai-hide-child-pages",
  );

  const handleSnapshot = useCallback((payload: { blocks: Json; stats: DocumentStats }) => {
    latestBlocksRef.current = payload.blocks;
    setHistory((prev) => {
      const now = Date.now();
      if (prev.length > 0 && now - prev[0].timestamp < 4000) {
        return prev;
      }
      const snapshot: DocumentSnapshot = {
        id: `${now}-${Math.random().toString(36).slice(2, 8)}`,
        timestamp: now,
        blocks: payload.blocks,
        stats: payload.stats,
      };
      return [snapshot, ...prev].slice(0, 15);
    });
  }, []);

  const persistStatsRequest = useCallback((next: DocumentStats) => {
    void fetch("/api/documents/stats", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ documentId, workspaceId, stats: next }),
    }).catch((error) => console.error(error));
  }, [documentId, workspaceId]);

  const persistStats = useDebouncedCallback(persistStatsRequest, 1500);

  const handleStatsChange = useCallback(
    (nextStats: DocumentStats) => {
      setStats(nextStats);
      persistStats(nextStats);
    },
    [persistStats],
  );

  const handleRestoreSnapshot = useCallback(
    (snapshot: DocumentSnapshot) => {
      if (!editorBridge) {
        window.alert("编辑器尚未准备好，无法恢复历史版本");
        return;
      }
      editorBridge.replaceWithSnapshot(snapshot.blocks);
      setHistoryOpen(false);
    },
    [editorBridge],
  );

  return (
    <ImagePickerProvider documentId={documentId} workspaceId={workspaceId}>
      <div className={pageRootClass} ref={pageRootRef}>
        <div className="flex h-full flex-1 flex-col overflow-hidden">
          <div className="border-b border-wolai-border px-12 pb-6 pt-8">
            <div className="relative">
              <input
                value={pageTitle}
                onChange={handleTitleChange}
                onBlur={handleTitleBlur}
                onKeyDown={handleTitleKeyDown}
                placeholder="无标题"
                className="w-full border-none bg-transparent text-3xl font-semibold text-wolai-text-primary outline-none focus:ring-0"
                aria-label="页面标题"
                disabled={options.protectEditing || readOnly}
                spellCheck={spellCheck}
              />
            </div>
            {readOnly ? (
              <p className="mt-1 text-sm text-gray-500">该页面为只读共享，无法编辑。</p>
            ) : options.protectEditing ? (
              <p className="mt-1 text-sm text-[#b91c1c]">当前页面已开启编辑保护，关闭后方可修改内容。</p>
            ) : null}
            <p className="text-sm text-wolai-text-secondary">最近更新：{formattedUpdatedAt}</p>
          </div>
          <div className="flex-1 overflow-y-auto px-12 py-6">
            {contentLoading ? (
              showContentLoadingIndicator ? (
                <div className="flex h-64 items-center justify-center text-sm text-gray-400">
                  页面内容加载中...
                </div>
              ) : (
                <div className="h-64" />
              )
            ) : contentError ? (
              <div className="flex h-64 flex-col items-center justify-center gap-2 text-sm text-red-600">
                <div>{contentError}</div>
                <button
                  type="button"
                  className="rounded-md border border-red-200 bg-red-50 px-3 py-1 text-sm text-red-700 hover:bg-red-100"
                  onClick={() => {
                    setContentError(null);
                    setContentLoading(true);
                    setContentReloadKey((prev) => prev + 1);
                  }}
                >
                  重试
                </button>
              </div>
            ) : (
              <BlockNoteEditor
                documentId={documentId}
                workspaceId={workspaceId}
                initialContent={content}
                pageOptions={options}
                readOnly={readOnly}
                onStatsChange={handleStatsChange}
                onSnapshot={handleSnapshot}
                onCloseToc={closeToc}
              />
            )}
            <PageBacklinksPanel
              className="mt-10"
              workspaceId={workspaceId}
              documentId={documentId}
              defaultCollapsed={options.collapseBacklinks}
            />
          </div>
        </div>
        {showInspector && (
          <PageOptionsSidebar
            documentId={documentId}
            options={options}
            stats={stats}
            onToggle={toggleOption}
            onSetPageFont={handleSetPageFont}
            onSetLayoutDensity={handleSetLayoutDensity}
            onSetEmbedDefaultToCursor={handleSetEmbedDefaultToCursor}
            onClearEmbedDefault={handleClearEmbedDefault}
            onExport={handleExport}
            onOpenHistory={() => setHistoryOpen(true)}
            onOpenComments={() => openCommentsForPage({ workspaceId, documentId })}
            onUndo={handleUndo}
            onRedo={handleRedo}
            onDeletePage={handleDeletePage}
            onOpenMoveEmbedPicker={handleOpenMoveEmbed}
            onCopyPageLink={handleCopyPageLink}
            onCopyPageReference={handleCopyPageReference}
            onAddToTemplates={handleAddToTemplates}
          />
        )}
      </div>
      <DocumentHistoryDrawer
        open={historyOpen}
        onOpenChange={setHistoryOpen}
        history={history}
        onRestore={handleRestoreSnapshot}
      />
      <DocumentCommentsDrawer />
      <DocumentAiAgentPanel documentId={documentId} getLatestBlocks={() => latestBlocksRef.current} />
    </ImagePickerProvider>
  );
}