✨(frontend) add comments feature

Implemented the comments feature for the document
editor.
We are now able to add, view, and manage comments
within the document editor interface.

src/frontend/apps/impress/src/features/auth/api/types.ts

@@ -13,3 +13,5 @@ export interface User {
   short_name: string;
   language?: string;
 }
+
+export type UserLight = Pick<User, 'full_name' | 'short_name'>;

src/frontend/apps/impress/src/features/docs/doc-editor/components/BlockNoteEditor.tsx

@@ -14,11 +14,13 @@ import { useCreateBlockNote } from '@blocknote/react';
 import { HocuspocusProvider } from '@hocuspocus/provider';
 import { useEffect, useRef } from 'react';
 import { useTranslation } from 'react-i18next';
+import { css } from 'styled-components';
 import * as Y from 'yjs';
 
 import { Box, TextErrors } from '@/components';
 import { Doc, useProviderStore } from '@/docs/doc-management';
 import { useAuth } from '@/features/auth';
+import { useResponsiveStore } from '@/stores';
 
 import {
   useHeadings,
@@ -34,6 +36,7 @@ import { randomColor } from '../utils';
 
 import { BlockNoteSuggestionMenu } from './BlockNoteSuggestionMenu';
 import { BlockNoteToolbar } from './BlockNoteToolBar/BlockNoteToolbar';
+import { cssComments, useComments } from './comments/';
 import {
   AccessibleImageBlock,
   CalloutBlock,
@@ -79,8 +82,10 @@ export const BlockNoteEditor = ({ doc, provider }: BlockNoteEditorProps) => {
   const { user } = useAuth();
   const { setEditor } = useEditorStore();
   const { t } = useTranslation();
+  const { isDesktop } = useResponsiveStore();
   const { isSynced: isConnectedToCollabServer } = useProviderStore();
   const refEditorContainer = useRef<HTMLDivElement>(null);
+  const canSeeComment = doc.abilities.comment && isDesktop;
 
   useSaveDoc(doc.id, provider.document, isConnectedToCollabServer);
   const { i18n } = useTranslation();
@@ -91,6 +96,8 @@ export const BlockNoteEditor = ({ doc, provider }: BlockNoteEditorProps) => {
   const collabName = user?.full_name || user?.email || t('Anonymous');
   const showCursorLabels: 'always' | 'activity' | (string & {}) = 'activity';
 
+  const threadStore = useComments(doc.id, canSeeComment, user);
+
   const editor: DocsBlockNoteEditor = useCreateBlockNote(
     {
       collaboration: {
@@ -138,11 +145,25 @@ export const BlockNoteEditor = ({ doc, provider }: BlockNoteEditorProps) => {
         },
         showCursorLabels: showCursorLabels as 'always' | 'activity',
       },
+      comments: { threadStore },
       dictionary: {
         ...locales[lang as keyof typeof locales],
         multi_column:
           multiColumnLocales?.[lang as keyof typeof multiColumnLocales],
       },
+      resolveUsers: async (userIds) => {
+        return Promise.resolve(
+          userIds.map((encodedURIUserId) => {
+            const fullName = decodeURIComponent(encodedURIUserId);
+
+            return {
+              id: encodedURIUserId,
+              username: fullName || t('Anonymous'),
+              avatarUrl: 'https://i.pravatar.cc/300',
+            };
+          }),
+        );
+      },
       tables: {
         splitCells: true,
         cellBackgroundColor: true,
@@ -152,7 +173,7 @@ export const BlockNoteEditor = ({ doc, provider }: BlockNoteEditorProps) => {
       uploadFile,
       schema: blockNoteSchema,
     },
-    [collabName, lang, provider, uploadFile],
+    [collabName, lang, provider, uploadFile, threadStore],
   );
 
   useHeadings(editor);
@@ -170,7 +191,13 @@ export const BlockNoteEditor = ({ doc, provider }: BlockNoteEditorProps) => {
   }, [setEditor, editor]);
 
   return (
-    <Box ref={refEditorContainer} $css={cssEditor}>
+    <Box
+      ref={refEditorContainer}
+      $css={css`
+        ${cssEditor};
+        ${cssComments(canSeeComment)}
+      `}
+    >
       {errorAttachment && (
         <Box $margin={{ bottom: 'big', top: 'none', horizontal: 'large' }}>
           <TextErrors
@@ -180,12 +207,13 @@ export const BlockNoteEditor = ({ doc, provider }: BlockNoteEditorProps) => {
           />
         </Box>
       )}
-
       <BlockNoteView
+        className="--docs--main-editor"
         editor={editor}
         formattingToolbar={false}
         slashMenu={false}
         theme="light"
+        comments={canSeeComment}
         aria-label={t('Document editor')}
       >
         <BlockNoteSuggestionMenu />
@@ -196,11 +224,17 @@ export const BlockNoteEditor = ({ doc, provider }: BlockNoteEditorProps) => {
 };
 
 interface BlockNoteReaderProps {
+  docId: Doc['id'];
   initialContent: Y.XmlFragment;
 }
 
-export const BlockNoteReader = ({ initialContent }: BlockNoteReaderProps) => {
+export const BlockNoteReader = ({
+  docId,
+  initialContent,
+}: BlockNoteReaderProps) => {
+  const { user } = useAuth();
   const { setEditor } = useEditorStore();
+  const threadStore = useComments(docId, false, user);
   const { t } = useTranslation();
   const editor = useCreateBlockNote(
     {
@@ -213,6 +247,10 @@ export const BlockNoteReader = ({ initialContent }: BlockNoteReaderProps) => {
         provider: undefined,
       },
       schema: blockNoteSchema,
+      comments: { threadStore },
+      resolveUsers: async () => {
+        return Promise.resolve([]);
+      },
     },
     [initialContent],
   );
@@ -228,14 +266,21 @@ export const BlockNoteReader = ({ initialContent }: BlockNoteReaderProps) => {
   useHeadings(editor);
 
   return (
-    <Box $css={cssEditor}>
+    <Box
+      $css={css`
+        ${cssEditor};
+        ${cssComments(false)}
+      `}
+    >
       <BlockNoteView
+        className="--docs--main-editor"
         editor={editor}
         editable={false}
         theme="light"
         aria-label={t('Document version viewer')}
         formattingToolbar={false}
         slashMenu={false}
+        comments={false}
       />
     </Box>
   );

src/frontend/apps/impress/src/features/docs/doc-editor/components/DocEditor.tsx

@@ -117,6 +117,7 @@ export const DocEditor = ({ doc }: DocEditorProps) => {
               initialContent={provider.document.getXmlFragment(
                 'document-store',
               )}
+              docId={doc.id}
             />
           ) : (
             <BlockNoteEditor doc={doc} provider={provider} />

src/frontend/apps/impress/src/features/docs/doc-editor/components/comments/DocsThreadStore.tsx

@@ -0,0 +1,569 @@
+import { CommentBody, ThreadStore } from '@blocknote/core/comments';
+import type { Awareness } from 'y-protocols/awareness';
+
+import { APIError, APIList, errorCauses, fetchAPI } from '@/api';
+import { Doc } from '@/features/docs/doc-management';
+
+import { useEditorStore } from '../../stores';
+
+import { DocsThreadStoreAuth } from './DocsThreadStoreAuth';
+import {
+  ClientCommentData,
+  ClientThreadData,
+  ServerComment,
+  ServerReaction,
+  ServerThread,
+} from './types';
+
+type ServerThreadListResponse = APIList<ServerThread>;
+
+export class DocsThreadStore extends ThreadStore {
+  protected static COMMENTS_PING = 'commentsPing';
+  protected threads: Map<string, ClientThreadData> = new Map();
+  private subscribers = new Set<
+    (threads: Map<string, ClientThreadData>) => void
+  >();
+  private awareness?: Awareness;
+  private lastPingAt = 0;
+  private pingTimer?: ReturnType<typeof setTimeout>;
+
+  constructor(
+    protected docId: Doc['id'],
+    awareness: Awareness | undefined,
+    protected docAuth: DocsThreadStoreAuth,
+  ) {
+    super(docAuth);
+
+    if (docAuth.canSee) {
+      this.awareness = awareness;
+      this.awareness?.on('update', this.onAwarenessUpdate);
+      void this.refreshThreads();
+    }
+  }
+
+  public destroy() {
+    this.awareness?.off('update', this.onAwarenessUpdate);
+    if (this.pingTimer) {
+      clearTimeout(this.pingTimer);
+    }
+  }
+
+  private onAwarenessUpdate = async ({
+    added,
+    updated,
+  }: {
+    added: number[];
+    updated: number[];
+  }) => {
+    if (!this.awareness) {
+      return;
+    }
+    const states = this.awareness.getStates();
+    const listClientIds = [...added, ...updated];
+    for (const clientId of listClientIds) {
+      // Skip our own client ID
+      if (clientId === this.awareness.clientID) {
+        continue;
+      }
+
+      const state = states.get(clientId) as
+        | {
+            [DocsThreadStore.COMMENTS_PING]?: {
+              at: number;
+              docId: string;
+              isResolving: boolean;
+              threadId: string;
+            };
+          }
+        | undefined;
+
+      const ping = state?.commentsPing;
+
+      // Skip if no ping information is available
+      if (!ping) {
+        continue;
+      }
+
+      // Skip if the document ID doesn't match
+      if (ping.docId !== this.docId) {
+        continue;
+      }
+
+      // Skip if the ping timestamp is past
+      if (ping.at <= this.lastPingAt) {
+        continue;
+      }
+
+      this.lastPingAt = ping.at;
+
+      // If we know the threadId, schedule a targeted refresh. Otherwise, fall back to full refresh.
+      if (ping.threadId) {
+        await this.refreshThread(ping.threadId);
+      } else {
+        await this.refreshThreads();
+      }
+    }
+  };
+
+  /**
+   * To ping the other clients for updates on a specific thread
+   * @param threadId
+   */
+  private ping(threadId?: string) {
+    this.awareness?.setLocalStateField(DocsThreadStore.COMMENTS_PING, {
+      at: Date.now(),
+      docId: this.docId,
+      threadId,
+    });
+  }
+
+  /**
+   * Notifies all subscribers about the current thread state
+   */
+  private notifySubscribers() {
+    // Always emit a new Map reference to help consumers detect changes
+    const threads = new Map(this.threads);
+    this.subscribers.forEach((cb) => {
+      try {
+        cb(threads);
+      } catch (e) {
+        console.warn('DocsThreadStore subscriber threw', e);
+      }
+    });
+  }
+
+  private upsertClientThreadData(thread: ClientThreadData) {
+    const next = new Map(this.threads);
+    next.set(thread.id, thread);
+    this.threads = next;
+  }
+
+  private removeThread(threadId: string) {
+    const next = new Map(this.threads);
+    next.delete(threadId);
+    this.threads = next;
+  }
+
+  /**
+   * To subscribe to thread updates
+   * @param cb
+   * @returns
+   */
+  public subscribe(cb: (threads: Map<string, ClientThreadData>) => void) {
+    if (!this.docAuth.canSee) {
+      return () => {};
+    }
+
+    this.subscribers.add(cb);
+
+    // Emit initial state asynchronously to avoid running during editor init
+    setTimeout(() => {
+      if (this.subscribers.has(cb)) {
+        cb(this.getThreads());
+      }
+    }, 0);
+
+    return () => {
+      this.subscribers.delete(cb);
+    };
+  }
+
+  public addThreadToDocument = (options: {
+    threadId: string;
+    selection: {
+      prosemirror: {
+        head: number;
+        anchor: number;
+      };
+      yjs: {
+        head: unknown;
+        anchor: unknown;
+      };
+    };
+  }) => {
+    const { threadId } = options;
+    const { editor } = useEditorStore.getState();
+
+    // Should not happen
+    if (!editor) {
+      console.warn('Editor to add thread not ready');
+      return Promise.resolve();
+    }
+
+    editor._tiptapEditor
+      .chain()
+      .focus?.()
+      .setMark?.('comment', { orphan: false, threadId })
+      .run?.();
+
+    return Promise.resolve();
+  };
+
+  public createThread = async (options: {
+    initialComment: {
+      body: CommentBody;
+      metadata?: unknown;
+    };
+    metadata?: unknown;
+  }) => {
+    const response = await fetchAPI(`documents/${this.docId}/threads/`, {
+      method: 'POST',
+      body: JSON.stringify({
+        body: options.initialComment.body,
+      }),
+    });
+
+    if (!response.ok) {
+      throw new APIError(
+        'Failed to create thread in document',
+        await errorCauses(response),
+      );
+    }
+
+    const thread = (await response.json()) as ServerThread;
+    const threadData: ClientThreadData = serverThreadToClientThread(thread);
+    this.upsertClientThreadData(threadData);
+    this.notifySubscribers();
+    this.ping(threadData.id);
+    return threadData;
+  };
+
+  public getThread(threadId: string) {
+    const thread = this.threads.get(threadId);
+    if (!thread) {
+      throw new Error('Thread not found');
+    }
+
+    return thread;
+  }
+
+  public getThreads(): Map<string, ClientThreadData> {
+    if (!this.docAuth.canSee) {
+      return new Map();
+    }
+
+    return this.threads;
+  }
+
+  public async refreshThread(threadId: string) {
+    const response = await fetchAPI(
+      `documents/${this.docId}/threads/${threadId}/`,
+      { method: 'GET' },
+    );
+
+    // If not OK and 404, the thread might have been deleted but the
+    // thread modal is still open, so we close it to avoid side effects
+    if (response.status === 404) {
+      // use escape key event to close the thread modal
+      document.dispatchEvent(
+        new KeyboardEvent('keydown', {
+          key: 'Escape',
+          code: 'Escape',
+          keyCode: 27,
+          bubbles: true,
+          cancelable: true,
+        }),
+      );
+
+      await this.refreshThreads();
+      return;
+    }
+
+    if (!response.ok) {
+      throw new APIError(
+        `Failed to fetch thread ${threadId}`,
+        await errorCauses(response),
+      );
+    }
+
+    const serverThread = (await response.json()) as ServerThread;
+
+    const clientThread = serverThreadToClientThread(serverThread);
+    this.upsertClientThreadData(clientThread);
+    this.notifySubscribers();
+  }
+
+  public async refreshThreads(): Promise<void> {
+    const response = await fetchAPI(`documents/${this.docId}/threads/`, {
+      method: 'GET',
+    });
+
+    if (!response.ok) {
+      throw new APIError(
+        'Failed to get threads in document',
+        await errorCauses(response),
+      );
+    }
+
+    const threads = (await response.json()) as ServerThreadListResponse;
+    const next = new Map<string, ClientThreadData>();
+    threads.results.forEach((thread) => {
+      const threadData: ClientThreadData = serverThreadToClientThread(thread);
+      next.set(thread.id, threadData);
+    });
+    this.threads = next;
+    this.notifySubscribers();
+  }
+
+  public addComment = async (options: {
+    comment: {
+      body: CommentBody;
+      metadata?: unknown;
+    };
+    threadId: string;
+  }) => {
+    const { threadId } = options;
+
+    const response = await fetchAPI(
+      `documents/${this.docId}/threads/${threadId}/comments/`,
+      {
+        method: 'POST',
+        body: JSON.stringify({
+          body: options.comment.body,
+        }),
+      },
+    );
+
+    if (!response.ok) {
+      throw new APIError('Failed to add comment ', await errorCauses(response));
+    }
+
+    const comment = (await response.json()) as ServerComment;
+
+    // Optimistically update local thread with new comment
+    const existing = this.threads.get(threadId);
+    if (existing) {
+      const updated: ClientThreadData = {
+        ...existing,
+        updatedAt: new Date(comment.updated_at || comment.created_at),
+        comments: [...existing.comments, serverCommentToClientComment(comment)],
+      };
+      this.upsertClientThreadData(updated);
+      this.notifySubscribers();
+    } else {
+      // Fallback to fetching the thread if we don't have it locally
+      await this.refreshThread(threadId);
+    }
+    this.ping(threadId);
+    return serverCommentToClientComment(comment);
+  };
+
+  public updateComment = async (options: {
+    comment: {
+      body: CommentBody;
+      metadata?: unknown;
+    };
+    threadId: string;
+    commentId: string;
+  }) => {
+    const { threadId, commentId, comment } = options;
+
+    const response = await fetchAPI(
+      `documents/${this.docId}/threads/${threadId}/comments/${commentId}/`,
+      {
+        method: 'PUT',
+        body: JSON.stringify({
+          body: comment.body,
+        }),
+      },
+    );
+
+    if (!response.ok) {
+      throw new APIError(
+        'Failed to add thread to document',
+        await errorCauses(response),
+      );
+    }
+
+    await this.refreshThread(threadId);
+    this.ping(threadId);
+
+    return;
+  };
+
+  public deleteComment = async (options: {
+    threadId: string;
+    commentId: string;
+    softDelete?: boolean;
+  }) => {
+    const { threadId, commentId } = options;
+
+    const response = await fetchAPI(
+      `documents/${this.docId}/threads/${threadId}/comments/${commentId}/`,
+      {
+        method: 'DELETE',
+      },
+    );
+
+    if (!response.ok) {
+      throw new APIError(
+        'Failed to delete comment',
+        await errorCauses(response),
+      );
+    }
+
+    // Optimistically remove the comment locally if we have the thread
+    const existing = this.threads.get(threadId);
+    if (existing) {
+      const updated: ClientThreadData = {
+        ...existing,
+        updatedAt: new Date(),
+        comments: existing.comments.filter((c) => c.id !== commentId),
+      };
+      this.upsertClientThreadData(updated);
+      this.notifySubscribers();
+    } else {
+      // Fallback to fetching the thread
+      await this.refreshThread(threadId);
+    }
+    this.ping(threadId);
+  };
+
+  /**
+   * UI not implemented
+   * @param _options
+   */
+  public deleteThread = async (_options: { threadId: string }) => {
+    const response = await fetchAPI(
+      `documents/${this.docId}/threads/${_options.threadId}/`,
+      {
+        method: 'DELETE',
+      },
+    );
+
+    if (!response.ok) {
+      throw new APIError(
+        'Failed to delete thread',
+        await errorCauses(response),
+      );
+    }
+
+    // Remove locally and notify; no need to refetch everything
+    this.removeThread(_options.threadId);
+    this.notifySubscribers();
+    this.ping(_options.threadId);
+  };
+
+  public resolveThread = async (_options: { threadId: string }) => {
+    const { threadId } = _options;
+
+    const response = await fetchAPI(
+      `documents/${this.docId}/threads/${threadId}/resolve/`,
+      { method: 'POST' },
+    );
+
+    if (!response.ok) {
+      throw new APIError(
+        'Failed to resolve thread',
+        await errorCauses(response),
+      );
+    }
+
+    await this.refreshThreads();
+    this.ping(threadId);
+  };
+
+  /**
+   * Todo: Not implemented backend side
+   * @returns
+   * @throws
+   */
+  public unresolveThread = async (_options: { threadId: string }) => {
+    const response = await fetchAPI(
+      `documents/${this.docId}/threads/${_options.threadId}/unresolve/`,
+      { method: 'POST' },
+    );
+
+    if (!response.ok) {
+      throw new APIError(
+        'Failed to unresolve thread',
+        await errorCauses(response),
+      );
+    }
+
+    await this.refreshThread(_options.threadId);
+    this.ping(_options.threadId);
+  };
+
+  public addReaction = async (options: {
+    threadId: string;
+    commentId: string;
+    emoji: string;
+  }) => {
+    const response = await fetchAPI(
+      `documents/${this.docId}/threads/${options.threadId}/comments/${options.commentId}/reactions/`,
+      {
+        method: 'POST',
+        body: JSON.stringify({ emoji: options.emoji }),
+      },
+    );
+
+    if (!response.ok) {
+      throw new APIError(
+        'Failed to add reaction to comment',
+        await errorCauses(response),
+      );
+    }
+
+    await this.refreshThread(options.threadId);
+    this.notifySubscribers();
+    this.ping(options.threadId);
+  };
+
+  public deleteReaction = async (options: {
+    threadId: string;
+    commentId: string;
+    emoji: string;
+  }) => {
+    const response = await fetchAPI(
+      `documents/${this.docId}/threads/${options.threadId}/comments/${options.commentId}/reactions/`,
+      { method: 'DELETE', body: JSON.stringify({ emoji: options.emoji }) },
+    );
+
+    if (!response.ok) {
+      throw new APIError(
+        'Failed to delete reaction from comment',
+        await errorCauses(response),
+      );
+    }
+
+    await this.refreshThread(options.threadId);
+    this.notifySubscribers();
+    this.ping(options.threadId);
+  };
+}
+
+const serverReactionToReactionData = (r: ServerReaction) => {
+  return {
+    emoji: r.emoji,
+    createdAt: new Date(r.created_at),
+    userIds: r.users?.map((user) =>
+      encodeURIComponent(user.full_name || ''),
+    ) || [''],
+  };
+};
+
+const serverCommentToClientComment = (c: ServerComment): ClientCommentData => ({
+  type: 'comment',
+  id: c.id,
+  userId: encodeURIComponent(c.user?.full_name || ''),
+  body: c.body,
+  createdAt: new Date(c.created_at),
+  updatedAt: new Date(c.updated_at),
+  reactions: (c.reactions ?? []).map(serverReactionToReactionData),
+  metadata: { abilities: c.abilities },
+});
+
+const serverThreadToClientThread = (t: ServerThread): ClientThreadData => ({
+  type: 'thread',
+  id: t.id,
+  createdAt: new Date(t.created_at),
+  updatedAt: new Date(t.updated_at),
+  comments: (t.comments ?? []).map(serverCommentToClientComment),
+  resolved: t.resolved,
+  resolvedUpdatedAt: t.resolved_updated_at
+    ? new Date(t.resolved_updated_at)
+    : undefined,
+  resolvedBy: t.resolved_by || undefined,
+  metadata: { abilities: t.abilities, metadata: t.metadata },
+});

src/frontend/apps/impress/src/features/docs/doc-editor/components/comments/DocsThreadStoreAuth.tsx

@@ -0,0 +1,94 @@
+import { ThreadStoreAuth } from '@blocknote/core/comments';
+
+import { ClientCommentData, ClientThreadData } from './types';
+
+export class DocsThreadStoreAuth extends ThreadStoreAuth {
+  constructor(
+    private readonly userId: string,
+    public canSee: boolean,
+  ) {
+    super();
+  }
+
+  canCreateThread(): boolean {
+    return true;
+  }
+
+  canAddComment(_thread: ClientThreadData): boolean {
+    return true;
+  }
+
+  canUpdateComment(comment: ClientCommentData): boolean {
+    if (
+      comment.metadata.abilities.partial_update &&
+      comment.userId === this.userId
+    ) {
+      return true;
+    }
+
+    return false;
+  }
+
+  canDeleteComment(comment: ClientCommentData): boolean {
+    if (comment.metadata.abilities.destroy) {
+      return true;
+    }
+
+    return false;
+  }
+
+  canDeleteThread(thread: ClientThreadData): boolean {
+    if (thread.metadata.abilities.destroy) {
+      return true;
+    }
+
+    return false;
+  }
+
+  canResolveThread(thread: ClientThreadData): boolean {
+    if (thread.metadata.abilities.resolve) {
+      return true;
+    }
+
+    return false;
+  }
+
+  /**
+   * Not implemented backend side
+   * @param _thread
+   * @returns
+   */
+  canUnresolveThread(_thread: ClientThreadData): boolean {
+    return false;
+  }
+
+  canAddReaction(comment: ClientCommentData, emoji?: string): boolean {
+    if (!comment.metadata.abilities.reactions) {
+      return false;
+    }
+
+    if (!emoji) {
+      return true;
+    }
+
+    return !comment.reactions.some(
+      (reaction) =>
+        reaction.emoji === emoji && reaction.userIds.includes(this.userId),
+    );
+  }
+
+  canDeleteReaction(comment: ClientCommentData, emoji?: string): boolean {
+    if (!comment.metadata.abilities.reactions) {
+      return false;
+    }
+
+    if (!emoji) {
+      return true;
+    }
+
+    return comment.reactions.some(
+      (reaction) =>
+        reaction.emoji === emoji && reaction.userIds.includes(this.userId),
+    );
+  }
+}

src/frontend/apps/impress/src/features/docs/doc-editor/components/comments/index.ts

@@ -0,0 +1,2 @@
+export * from './styles';
+export * from './useComments';

src/frontend/apps/impress/src/features/docs/doc-editor/components/comments/styles.tsx

@@ -0,0 +1,198 @@
+import { css } from 'styled-components';
+
+export const cssComments = (canSeeComment: boolean) => css`
+  & .--docs--main-editor,
+  & .--docs--main-editor .ProseMirror {
+    // Comments marks in the editor
+    .bn-editor {
+      .bn-thread-mark:not([data-orphan='true']),
+      .bn-thread-mark-selected:not([data-orphan='true']) {
+        background: ${canSeeComment ? '#EDB40066' : 'transparent'};
+        color: var(--c--theme--colors--greyscale-700);
+      }
+    }
+
+    em-emoji-picker {
+      box-shadow: 0px 6px 18px 0px #00001229;
+      min-height: 420px;
+    }
+
+    // Thread modal
+    .bn-thread {
+      width: 400px;
+      padding: 8px;
+      box-shadow: 0px 6px 18px 0px #00001229;
+      margin-left: 20px;
+      gap: 0;
+      overflow: auto;
+      max-height: 500px;
+
+      .bn-default-styles {
+        font-family: var(--c--theme--font--families--base);
+      }
+
+      .bn-block {
+        font-size: 14px;
+      }
+
+      .bn-inline-content:has(> .ProseMirror-trailingBreak:only-child):before {
+        font-style: normal;
+        font-size: 14px;
+      }
+
+      // Remove tooltip
+      *[role='tooltip'] {
+        display: none;
+      }
+
+      .bn-thread-comment {
+        padding: 8px;
+
+        & .bn-editor {
+          padding-left: 32px;
+          .bn-inline-content {
+            color: var(--c--theme--colors--greyscale-700);
+          }
+        }
+
+        // Emoji
+        & .bn-badge-group {
+          padding-left: 32px;
+          .bn-badge label {
+            padding: 0 4px;
+            background: none;
+            border: 1px solid var(--c--theme--colors--greyscale-300);
+            border-radius: 4px;
+            height: 24px;
+          }
+        }
+
+        // Top bar (Name / Date / Actions) when actions displayed
+        &:has(.bn-comment-actions) {
+          & > .mantine-Group-root {
+            max-width: 70%;
+            right: 0.3rem !important;
+            top: 0.3rem !important;
+          }
+
+          .bn-menu-dropdown {
+            box-shadow: 0px 0px 6px 0px #0000911a;
+          }
+        }
+
+        // Top bar (Name / Date / Actions)
+        & > .mantine-Group-root {
+          flex-wrap: nowrap;
+          max-width: 100%;
+          gap: 0.5rem;
+
+          // Date
+          span.mantine-focus-auto {
+            display: inline-block;
+          }
+
+          .bn-comment-actions {
+            background: transparent;
+            border: none;
+
+            .mantine-Button-root {
+              background-color: transparent;
+
+              &:hover {
+                background-color: var(--c--theme--colors--greyscale-100);
+              }
+            }
+
+            button[role='menuitem'] svg {
+              color: var(--c--theme--colors--greyscale-600);
+            }
+          }
+
+          & svg {
+            color: var(--c--theme--colors--info-600);
+          }
+        }
+
+        // Actions button edit comment
+        .bn-container + .bn-comment-actions-wrapper {
+          .bn-comment-actions {
+            flex-direction: row-reverse;
+            background: none;
+            border: none;
+            gap: 0.4rem !important;
+
+            & > button {
+              height: 24px;
+              padding-inline: 4px;
+
+              &[data-test='save'] {
+                border: 1px solid var(--c--theme--colors--info-600);
+                background: var(--c--theme--colors--info-600);
+                color: white;
+              }
+
+              &[data-test='cancel'] {
+                background: white;
+                border: 1px solid var(--c--theme--colors--greyscale-300);
+                color: var(--c--theme--colors--info-600);
+              }
+            }
+          }
+        }
+      }
+
+      // Input to add a new comment
+      .bn-thread-composer,
+      &:has(> .bn-comment-editor + .bn-comment-actions-wrapper) {
+        padding: 0.5rem 8px;
+        flex-direction: row;
+        gap: 10px;
+
+        .bn-container.bn-comment-editor {
+          min-width: 0;
+        }
+      }
+
+      // Actions button send comment
+      .bn-thread-composer .bn-comment-actions-wrapper,
+      &:not(.selected) .bn-comment-actions-wrapper {
+        flex-basis: fit-content;
+
+        .bn-action-toolbar.bn-comment-actions {
+          border: none;
+
+          button {
+            font-size: 0;
+            background: var(--c--theme--colors--info-600);
+            width: 24px;
+            height: 24px;
+            padding: 0;
+
+            &:disabled {
+              background: var(--c--theme--colors--greyscale-300);
+            }
+
+            & .mantine-Button-label::before {
+              content: '🡡';
+              font-size: 13px;
+              color: var(--c--theme--colors--greyscale-100);
+            }
+          }
+        }
+      }
+
+      // Input first comment
+      &:not(.selected) {
+        gap: 0.5rem;
+
+        .bn-container.bn-comment-editor {
+          min-width: 0;
+
+          .ProseMirror.bn-editor {
+            cursor: text;
+          }
+        }
+      }
+    }
+  }
+`;

src/frontend/apps/impress/src/features/docs/doc-editor/components/comments/types.ts

@@ -0,0 +1,55 @@
+import { CommentData, ThreadData } from '@blocknote/core/comments';
+
+import { UserLight } from '@/features/auth';
+
+export interface CommentAbilities {
+  destroy: boolean;
+  update: boolean;
+  partial_update: boolean;
+  retrieve: boolean;
+  reactions: boolean;
+}
+export interface ThreadAbilities {
+  destroy: boolean;
+  update: boolean;
+  partial_update: boolean;
+  retrieve: boolean;
+  resolve: boolean;
+}
+
+export interface ServerReaction {
+  emoji: string;
+  created_at: string;
+  users: UserLight[] | null;
+}
+
+export interface ServerComment {
+  id: string;
+  user: UserLight | null;
+  body: unknown;
+  created_at: string;
+  updated_at: string;
+  reactions: ServerReaction[];
+  abilities: CommentAbilities;
+}
+
+export interface ServerThread {
+  id: string;
+  created_at: string;
+  updated_at: string;
+  user: UserLight | null;
+  resolved: boolean;
+  resolved_updated_at: string | null;
+  resolved_by: string | null;
+  metadata: unknown;
+  comments: ServerComment[];
+  abilities: ThreadAbilities;
+}
+
+export type ClientCommentData = Omit<CommentData, 'metadata'> & {
+  metadata: { abilities: CommentAbilities };
+};
+
+export type ClientThreadData = Omit<ThreadData, 'metadata'> & {
+  metadata: { abilities: ThreadAbilities; metadata: unknown };
+};

src/frontend/apps/impress/src/features/docs/doc-editor/components/comments/useComments.ts

@@ -0,0 +1,33 @@
+import { useEffect, useMemo } from 'react';
+
+import { User } from '@/features/auth';
+import { Doc, useProviderStore } from '@/features/docs/doc-management';
+
+import { DocsThreadStore } from './DocsThreadStore';
+import { DocsThreadStoreAuth } from './DocsThreadStoreAuth';
+
+export function useComments(
+  docId: Doc['id'],
+  canComment: boolean,
+  user: User | null | undefined,
+) {
+  const { provider } = useProviderStore();
+  const threadStore = useMemo(() => {
+    return new DocsThreadStore(
+      docId,
+      provider?.awareness ?? undefined,
+      new DocsThreadStoreAuth(
+        encodeURIComponent(user?.full_name || ''),
+        canComment,
+      ),
+    );
+  }, [docId, canComment, provider?.awareness, user?.full_name]);
+
+  useEffect(() => {
+    return () => {
+      threadStore?.destroy();
+    };
+  }, [threadStore]);
+
+  return threadStore;
+}

src/frontend/apps/impress/src/features/docs/doc-management/types.tsx

@@ -80,6 +80,7 @@ export interface Doc {
     children_create: boolean;
     children_list: boolean;
     collaboration_auth: boolean;
+    comment: boolean;
     destroy: boolean;
     duplicate: boolean;
     favorite: boolean;

src/frontend/apps/impress/src/features/docs/doc-versioning/components/DocVersionEditor.tsx

@@ -77,7 +77,9 @@ export const DocVersionEditor = ({
   return (
     <DocEditorContainer
       docHeader={<DocVersionHeader />}
-      docEditor={<BlockNoteReader initialContent={initialContent} />}
+      docEditor={
+        <BlockNoteReader initialContent={initialContent} docId={version.id} />
+      }
       isDeletedDoc={false}
       readOnly={true}
     />

src/frontend/apps/impress/src/features/service-worker/plugins/ApiPlugin.ts

@@ -188,6 +188,7 @@ export class ApiPlugin implements WorkboxPlugin {
         children_create: true,
         children_list: true,
         collaboration_auth: true,
+        comment: true,
         destroy: true,
         duplicate: true,
         favorite: true,