feat: ai chat

apps/client/src/App.tsx

@@ -38,6 +38,7 @@ import UserApiKeys from "@/ee/api-key/pages/user-api-keys";
 import WorkspaceApiKeys from "@/ee/api-key/pages/workspace-api-keys";
 import AiSettings from "@/ee/ai/pages/ai-settings.tsx";
 import AuditLogs from "@/ee/audit/pages/audit-logs.tsx";
+import AiChat from "@/ee/ai-chat/pages/ai-chat.tsx";
 
 export default function App() {
   const { t } = useTranslation();
@@ -79,6 +80,8 @@ export default function App() {
 
         <Route element={<Layout />}>
           <Route path={"/home"} element={<Home />} />
+          <Route path={"/ai"} element={<AiChat />} />
+          <Route path={"/ai/chat/:chatId"} element={<AiChat />} />
           <Route path={"/spaces"} element={<SpacesPage />} />
           <Route path={"/s/:spaceSlug"} element={<SpaceHome />} />
           <Route path={"/s/:spaceSlug/trash"} element={<SpaceTrash />} />

apps/client/src/components/layouts/global/app-header.tsx

@@ -24,7 +24,10 @@ import {
 } from "@/features/search/constants.ts";
 import { NotificationPopover } from "@/features/notification/components/notification-popover.tsx";
 
-const links = [{ link: APP_ROUTE.HOME, label: "Home" }];
+const links = [
+  { link: APP_ROUTE.HOME, label: "Home" },
+  { link: "/ai", label: "AI Chat" },
+];
 
 export function AppHeader() {
   const { t } = useTranslation();

apps/client/src/components/layouts/global/global-app-shell.tsx

@@ -10,6 +10,7 @@ import {
   sidebarWidthAtom,
 } from "@/components/layouts/global/hooks/atoms/sidebar-atom.ts";
 import { SpaceSidebar } from "@/features/space/components/sidebar/space-sidebar.tsx";
+import AiChatSidebar from "@/ee/ai-chat/components/ai-chat-sidebar.tsx";
 import { AppHeader } from "@/components/layouts/global/app-header.tsx";
 import Aside from "@/components/layouts/global/aside.tsx";
 import classes from "./app-shell.module.css";
@@ -72,6 +73,7 @@ export default function GlobalAppShell({
   const location = useLocation();
   const isSettingsRoute = location.pathname.startsWith("/settings");
   const isSpaceRoute = location.pathname.startsWith("/s/");
+  const isAiRoute = location.pathname.startsWith("/ai");
   const isHomeRoute = location.pathname.startsWith("/home");
   const isSpacesRoute = location.pathname === "/spaces";
   const isPageRoute = location.pathname.includes("/p/");
@@ -82,7 +84,7 @@ export default function GlobalAppShell({
       header={{ height: 45 }}
       navbar={
         !hideSidebar && {
-          width: isSpaceRoute ? sidebarWidth : 300,
+          width: isAiRoute ? 260 : isSpaceRoute ? sidebarWidth : 300,
           breakpoint: "sm",
           collapsed: {
             mobile: !mobileOpened,
@@ -108,9 +110,10 @@ export default function GlobalAppShell({
           withBorder={false}
           ref={sidebarRef}
         >
-          <div className={classes.resizeHandle} onMouseDown={startResizing} />
+          {!isAiRoute && <div className={classes.resizeHandle} onMouseDown={startResizing} />}
           {isSpaceRoute && <SpaceSidebar />}
           {isSettingsRoute && <SettingsSidebar />}
+          {isAiRoute && <AiChatSidebar />}
         </AppShell.Navbar>
       )}
       <AppShell.Main>

apps/client/src/ee/ai-chat/components/ai-chat-layout.tsx

@@ -0,0 +1,80 @@
+import { useEffect } from "react";
+import { useParams } from "react-router-dom";
+import { useChatInfoQuery } from "../queries/ai-chat-query";
+import { useChatStream } from "../hooks/use-chat-stream";
+import ChatMessageList from "./chat-message-list";
+import ChatEmptyState from "./chat-empty-state";
+import ChatInput from "./chat-input";
+import classes from "../styles/ai-chat.module.css";
+
+export default function AiChatLayout() {
+  const { chatId } = useParams<{ chatId: string }>();
+  const chatInfoQuery = useChatInfoQuery(chatId);
+  const {
+    messages,
+    streamingContent,
+    streamingToolCalls,
+    isStreaming,
+    error,
+    sendMessage,
+    stopGeneration,
+    initMessages,
+  } = useChatStream(chatId);
+
+  useEffect(() => {
+    if (chatInfoQuery.data?.messages) {
+      initMessages(chatInfoQuery.data.messages);
+    }
+  }, [chatInfoQuery.data, initMessages]);
+
+  useEffect(() => {
+    if (!chatId) {
+      initMessages([]);
+    }
+  }, [chatId, initMessages]);
+
+  const hasMessages = messages.length > 0 || isStreaming;
+
+  if (!hasMessages) {
+    return (
+      <div className={classes.main}>
+        <ChatEmptyState
+          isStreaming={isStreaming}
+          onSend={sendMessage}
+          onStop={stopGeneration}
+        />
+      </div>
+    );
+  }
+
+  return (
+    <div className={classes.main}>
+      <ChatMessageList
+        messages={messages}
+        isStreaming={isStreaming}
+        streamingContent={streamingContent}
+        streamingToolCalls={streamingToolCalls}
+      />
+
+      {error && (
+        <div
+          style={{
+            padding: "0 var(--mantine-spacing-lg)",
+            color: "var(--mantine-color-red-6)",
+            fontSize: "var(--mantine-font-size-sm)",
+          }}
+        >
+          {error}
+        </div>
+      )}
+
+      <div className={classes.inputArea}>
+        <ChatInput
+          isStreaming={isStreaming}
+          onSend={sendMessage}
+          onStop={stopGeneration}
+        />
+      </div>
+    </div>
+  );
+}

apps/client/src/ee/ai-chat/components/ai-chat-sidebar-item.tsx

@@ -0,0 +1,117 @@
+import { useState, useRef, useEffect } from "react";
+import { ActionIcon, Menu, Popover, TextInput } from "@mantine/core";
+import { IconDots, IconTrash, IconEdit } from "@tabler/icons-react";
+import { Link } from "react-router-dom";
+import type { AiChat } from "../types/ai-chat.types";
+import classes from "../styles/chat-sidebar.module.css";
+
+type Props = {
+  chat: AiChat;
+  isActive: boolean;
+  onDelete: (chatId: string) => void;
+  onRename: (chatId: string, title: string) => void;
+};
+
+export default function AiChatSidebarItem({
+  chat,
+  isActive,
+  onDelete,
+  onRename,
+}: Props) {
+  const [renaming, setRenaming] = useState(false);
+  const [renameValue, setRenameValue] = useState("");
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (renaming) {
+      inputRef.current?.select();
+    }
+  }, [renaming]);
+
+  const startRename = () => {
+    setRenameValue(chat.title || "");
+    setRenaming(true);
+  };
+
+  const submitRename = () => {
+    const trimmed = renameValue.trim();
+    if (trimmed && trimmed !== chat.title) {
+      onRename(chat.id, trimmed);
+    }
+    setRenaming(false);
+  };
+
+  return (
+    <Popover
+      opened={renaming}
+      onClose={() => setRenaming(false)}
+      position="bottom-start"
+      withinPortal
+      trapFocus
+    >
+      <Popover.Target>
+        <Link
+          to={`/ai/chat/${chat.id}`}
+          className={classes.chatItem}
+          data-active={isActive || undefined}
+        >
+          <span className={classes.chatItemTitle}>
+            {chat.title || "Untitled chat"}
+          </span>
+          <div className={classes.chatItemActions}>
+            <Menu position="bottom-end" withinPortal>
+              <Menu.Target>
+                <ActionIcon
+                  variant="subtle"
+                  size="xs"
+                  color="gray"
+                  onClick={(e) => e.preventDefault()}
+                >
+                  <IconDots size={14} />
+                </ActionIcon>
+              </Menu.Target>
+              <Menu.Dropdown>
+                <Menu.Item
+                  leftSection={<IconEdit size={14} />}
+                  onClick={(e) => {
+                    e.preventDefault();
+                    startRename();
+                  }}
+                >
+                  Rename
+                </Menu.Item>
+                <Menu.Item
+                  leftSection={<IconTrash size={14} />}
+                  color="red"
+                  onClick={(e) => {
+                    e.preventDefault();
+                    onDelete(chat.id);
+                  }}
+                >
+                  Delete
+                </Menu.Item>
+              </Menu.Dropdown>
+            </Menu>
+          </div>
+        </Link>
+      </Popover.Target>
+      <Popover.Dropdown p="xs">
+        <TextInput
+          ref={inputRef}
+          size="xs"
+          placeholder="Chat name"
+          value={renameValue}
+          onChange={(e) => setRenameValue(e.currentTarget.value)}
+          onKeyDown={(e) => {
+            if (e.key === "Enter") {
+              submitRename();
+            } else if (e.key === "Escape") {
+              setRenaming(false);
+            }
+          }}
+          onBlur={submitRename}
+        />
+      </Popover.Dropdown>
+    </Popover>
+  );
+}

apps/client/src/ee/ai-chat/components/ai-chat-sidebar.tsx

@@ -0,0 +1,96 @@
+import { useState, useCallback, useMemo } from "react";
+import { useNavigate, useParams } from "react-router-dom";
+import { ActionIcon, TextInput, Loader } from "@mantine/core";
+import { useDebouncedValue } from "@mantine/hooks";
+import { IconPlus, IconSearch } from "@tabler/icons-react";
+import {
+  useChatsQuery,
+  useDeleteChatMutation,
+  useUpdateChatTitleMutation,
+  useSearchChatsQuery,
+} from "../queries/ai-chat-query";
+import AiChatSidebarItem from "./ai-chat-sidebar-item";
+import type { AiChat } from "../types/ai-chat.types";
+import classes from "../styles/chat-sidebar.module.css";
+
+export default function AiChatSidebar() {
+  const navigate = useNavigate();
+  const { chatId } = useParams<{ chatId: string }>();
+  const [search, setSearch] = useState("");
+  const [debouncedSearch] = useDebouncedValue(search, 300);
+  const chatsQuery = useChatsQuery();
+  const searchQuery = useSearchChatsQuery(debouncedSearch);
+  const deleteMutation = useDeleteChatMutation();
+  const renameMutation = useUpdateChatTitleMutation();
+
+  const chats = useMemo(() => {
+    if (debouncedSearch) {
+      return searchQuery.data || [];
+    }
+    return chatsQuery.data?.pages.flatMap((p) => p.items) || [];
+  }, [debouncedSearch, searchQuery.data, chatsQuery.data]);
+
+  const handleNewChat = useCallback(() => {
+    navigate("/ai");
+  }, [navigate]);
+
+  const handleDelete = useCallback(
+    (id: string) => {
+      deleteMutation.mutate(id, {
+        onSuccess: () => {
+          if (chatId === id) {
+            navigate("/ai");
+          }
+        },
+      });
+    },
+    [deleteMutation, chatId, navigate],
+  );
+
+  const handleRename = useCallback(
+    (chatId: string, title: string) => {
+      renameMutation.mutate({ chatId, title });
+    },
+    [renameMutation],
+  );
+
+  const isLoading = chatsQuery.isLoading || searchQuery.isLoading;
+
+  return (
+    <div className={classes.sidebar}>
+      <div className={classes.header}>
+        <span className={classes.title}>AI Chat</span>
+        <ActionIcon
+          variant="subtle"
+          color="gray"
+          onClick={handleNewChat}
+          aria-label="New chat"
+        >
+          <IconPlus size={18} />
+        </ActionIcon>
+      </div>
+
+      <TextInput
+        className={classes.searchInput}
+        placeholder="Search chats..."
+        leftSection={<IconSearch size={14} />}
+        size="xs"
+        value={search}
+        onChange={(e) => setSearch(e.currentTarget.value)}
+      />
+
+      <div className={classes.chatList}>
+        {isLoading && <Loader size="xs" mx="auto" mt="md" />}
+        {chats.map((chat) => (
+          <AiChatSidebarItem
+            key={chat.id}
+            chat={chat}
+            isActive={chat.id === chatId}
+            onDelete={handleDelete}
+            onRename={handleRename}
+          />
+        ))}
+      </div>
+    </div>
+  );
+}

apps/client/src/ee/ai-chat/components/chat-empty-state.tsx

@@ -0,0 +1,85 @@
+import {
+  IconSparkles,
+  IconSearch,
+  IconFilePlus,
+  IconEdit,
+  IconFileText,
+} from "@tabler/icons-react";
+import ChatInput from "./chat-input";
+import type { ChatAttachment, PageMention } from "../types/ai-chat.types";
+import classes from "../styles/ai-chat.module.css";
+
+type Suggestion = {
+  icon: React.ReactNode;
+  text: string;
+  prompt: string;
+};
+
+const SUGGESTIONS: Suggestion[] = [
+  {
+    icon: <IconSearch size={16} />,
+    text: "Search across all pages",
+    prompt: "Search for pages about ",
+  },
+  {
+    icon: <IconFilePlus size={16} />,
+    text: "Create a new page",
+    prompt: "Create a new page titled ",
+  },
+  {
+    icon: <IconFileText size={16} />,
+    text: "Summarize a page",
+    prompt: "Summarize the page @",
+  },
+  {
+    icon: <IconEdit size={16} />,
+    text: "Update page content",
+    prompt: "Update the page @",
+  },
+];
+
+type Props = {
+  isStreaming: boolean;
+  onSend: (content: string, mentions: PageMention[], attachments: ChatAttachment[]) => void;
+  onStop: () => void;
+};
+
+export default function ChatEmptyState({ isStreaming, onSend, onStop }: Props) {
+  const handleSuggestionClick = (prompt: string) => {
+    onSend(prompt, [], []);
+  };
+
+  return (
+    <div className={classes.emptyState}>
+      <IconSparkles size={48} stroke={1.5} className={classes.emptyStateIcon} />
+      <div className={classes.emptyStateTitle}>What can I help you with?</div>
+
+      <div className={classes.emptyStateInput}>
+        <ChatInput
+          isStreaming={isStreaming}
+          onSend={onSend}
+          onStop={onStop}
+          placeholder="Ask anything... Use @ to mention pages"
+          autofocus
+        />
+      </div>
+
+      <div className={classes.suggestionsSection}>
+        <div className={classes.suggestionsLabel}>Get started</div>
+        <div className={classes.suggestionsGrid}>
+          {SUGGESTIONS.map((s) => (
+            <button
+              key={s.text}
+              type="button"
+              className={classes.suggestionCard}
+              onClick={() => handleSuggestionClick(s.prompt)}
+            >
+              <span className={classes.suggestionIcon}>{s.icon}</span>
+              <span className={classes.suggestionText}>{s.text}</span>
+            </button>
+          ))}
+        </div>
+      </div>
+    </div>
+  );
+}

apps/client/src/ee/ai-chat/components/chat-input.tsx

@@ -0,0 +1,297 @@
+import { useCallback, useRef, useEffect, useState } from "react";
+import { IconArrowUp, IconPaperclip, IconPlayerStopFilled, IconX, IconFile, IconPhoto } from "@tabler/icons-react";
+import { EditorContent, ReactNodeViewRenderer, useEditor } from "@tiptap/react";
+import { Placeholder } from "@tiptap/extension-placeholder";
+import { StarterKit } from "@tiptap/starter-kit";
+import { Mention, LinkExtension } from "@docmost/editor-ext";
+import EmojiCommand from "@/features/editor/extensions/emoji-command";
+import mentionRenderItems from "@/features/editor/components/mention/mention-suggestion";
+import MentionView from "@/features/editor/components/mention/mention-view";
+import { uploadChatFile } from "../services/ai-chat-service";
+import type { ChatAttachment, PageMention } from "../types/ai-chat.types";
+import classes from "../styles/chat-input.module.css";
+
+type PendingAttachment = ChatAttachment & { uploading: boolean };
+
+const IMAGE_EXTENSIONS = ["png", "jpg", "jpeg", "webp", "gif"];
+const ACCEPTED_FILE_TYPES = ".pdf,.docx,.txt,.csv,.md,.png,.jpg,.jpeg,.webp";
+
+type Props = {
+  isStreaming: boolean;
+  onSend: (content: string, mentions: PageMention[], attachments: ChatAttachment[]) => void;
+  onStop: () => void;
+  placeholder?: string;
+  autofocus?: boolean;
+};
+
+function extractMentions(json: any): PageMention[] {
+  const mentions: PageMention[] = [];
+  const seen = new Set<string>();
+
+  function walk(node: any) {
+    if (node.type === "mention" && node.attrs?.entityType === "page" && node.attrs?.entityId) {
+      if (!seen.has(node.attrs.entityId)) {
+        seen.add(node.attrs.entityId);
+        mentions.push({
+          id: node.attrs.entityId,
+          title: node.attrs.label || "",
+          slugId: node.attrs.slugId || "",
+        });
+      }
+    }
+    if (node.content) {
+      for (const child of node.content) {
+        walk(child);
+      }
+    }
+  }
+
+  walk(json);
+  return mentions;
+}
+
+function editorJsonToText(json: any): string {
+  let text = "";
+
+  function walk(node: any) {
+    if (node.type === "text") {
+      text += node.text || "";
+    } else if (node.type === "mention") {
+      text += `@${node.attrs?.label || ""}`;
+    } else if (node.type === "paragraph") {
+      if (text.length > 0) text += "\n";
+      if (node.content) {
+        for (const child of node.content) {
+          walk(child);
+        }
+      }
+      return;
+    }
+    if (node.content) {
+      for (const child of node.content) {
+        walk(child);
+      }
+    }
+  }
+
+  walk(json);
+  return text;
+}
+
+export default function ChatInput({
+  isStreaming,
+  onSend,
+  onStop,
+  placeholder,
+  autofocus = true,
+}: Props) {
+  const [isEmpty, setIsEmpty] = useState(true);
+  const [pendingAttachments, setPendingAttachments] = useState<PendingAttachment[]>([]);
+  const fileInputRef = useRef<HTMLInputElement>(null);
+  const onSendRef = useRef(onSend);
+  onSendRef.current = onSend;
+
+  const handleFileSelect = useCallback(async (files: FileList | null) => {
+    if (!files?.length) return;
+
+    for (const file of Array.from(files)) {
+      const tempId = `uploading-${Date.now()}-${Math.random()}`;
+      const ext = file.name.split(".").pop()?.toLowerCase() || "";
+
+      const placeholder: PendingAttachment = {
+        id: tempId,
+        fileName: file.name,
+        fileExt: ext,
+        fileSize: file.size,
+        mimeType: file.type,
+        uploading: true,
+      };
+
+      setPendingAttachments((prev) => [...prev, placeholder]);
+
+      try {
+        const uploaded = await uploadChatFile(file);
+        setPendingAttachments((prev) =>
+          prev.map((a) =>
+            a.id === tempId ? { ...uploaded, uploading: false } : a,
+          ),
+        );
+      } catch {
+        setPendingAttachments((prev) => prev.filter((a) => a.id !== tempId));
+      }
+    }
+
+    if (fileInputRef.current) {
+      fileInputRef.current.value = "";
+    }
+  }, []);
+
+  const removeAttachment = useCallback((id: string) => {
+    setPendingAttachments((prev) => prev.filter((a) => a.id !== id));
+  }, []);
+
+  const handleSubmit = useCallback(() => {
+    if (!editor || isStreaming) return;
+    const json = editor.getJSON();
+    const text = editorJsonToText(json).trim();
+    const readyAttachments = pendingAttachments.filter((a) => !a.uploading);
+    if (!text && readyAttachments.length === 0) return;
+
+    const mentions = extractMentions(json);
+    onSendRef.current(text, mentions, readyAttachments);
+    editor.commands.clearContent();
+    editor.commands.focus();
+    setPendingAttachments([]);
+  }, [isStreaming, pendingAttachments]);
+
+  const handleSubmitRef = useRef(handleSubmit);
+  handleSubmitRef.current = handleSubmit;
+
+  const editor = useEditor({
+    extensions: [
+      StarterKit.configure({
+        gapcursor: false,
+        dropcursor: false,
+        link: false,
+      }),
+      Placeholder.configure({
+        placeholder: placeholder || "Ask anything... Use @ to mention pages",
+      }),
+      LinkExtension,
+      EmojiCommand,
+      Mention.configure({
+        suggestion: {
+          allowSpaces: true,
+          items: () => [],
+          // @ts-ignore
+          render: mentionRenderItems,
+        },
+        HTMLAttributes: {
+          class: "mention",
+        },
+      }).extend({
+        addNodeView() {
+          this.editor.isInitialized = true;
+          return ReactNodeViewRenderer(MentionView);
+        },
+      }),
+    ],
+    editorProps: {
+      handleDOMEvents: {
+        keydown: (_view, event) => {
+          if (
+            ["ArrowUp", "ArrowDown", "ArrowLeft", "ArrowRight", "Enter"].includes(
+              event.key,
+            )
+          ) {
+            const emojiCommand = document.querySelector("#emoji-command");
+            const mentionPopup = document.querySelector("#mention");
+            if (emojiCommand || mentionPopup) {
+              return true;
+            }
+          }
+
+          if (event.key === "Enter" && !event.shiftKey) {
+            event.preventDefault();
+            handleSubmitRef.current();
+            return true;
+          }
+        },
+      },
+    },
+    content: "",
+    editable: true,
+    immediatelyRender: true,
+    shouldRerenderOnTransaction: false,
+    autofocus: autofocus ? "end" : false,
+    onUpdate: ({ editor: e }) => {
+      setIsEmpty(!e.getText().trim());
+    },
+  });
+
+  useEffect(() => {
+    if (editor && autofocus) {
+      editor.commands.focus();
+    }
+  }, [editor]);
+
+  const hasContent = !isEmpty || pendingAttachments.some((a) => !a.uploading);
+
+  return (
+    <div className={classes.inputWrapper} data-chat-input>
+      <input
+        ref={fileInputRef}
+        type="file"
+        accept={ACCEPTED_FILE_TYPES}
+        multiple
+        style={{ display: "none" }}
+        onChange={(e) => handleFileSelect(e.target.files)}
+      />
+
+      {pendingAttachments.length > 0 && (
+        <div className={classes.attachmentChips}>
+          {pendingAttachments.map((attachment) => (
+            <div
+              key={attachment.id}
+              className={`${classes.attachmentChip} ${attachment.uploading ? classes.attachmentChipUploading : ""}`}
+            >
+              {IMAGE_EXTENSIONS.includes(attachment.fileExt) ? (
+                <IconPhoto size={14} />
+              ) : (
+                <IconFile size={14} />
+              )}
+              <span className={classes.attachmentChipName}>
+                {attachment.fileName}
+              </span>
+              {!attachment.uploading && (
+                <button
+                  type="button"
+                  className={classes.attachmentChipRemove}
+                  onClick={() => removeAttachment(attachment.id)}
+                  aria-label={`Remove ${attachment.fileName}`}
+                >
+                  <IconX size={12} />
+                </button>
+              )}
+            </div>
+          ))}
+        </div>
+      )}
+
+      <EditorContent editor={editor} className={classes.editorContent} />
+      <div className={classes.actions}>
+        <button
+          type="button"
+          className={classes.attachButton}
+          onClick={() => fileInputRef.current?.click()}
+          aria-label="Attach file"
+        >
+          <IconPaperclip size={18} />
+        </button>
+
+        <div style={{ flex: 1 }} />
+
+        {isStreaming ? (
+          <button
+            type="button"
+            className={classes.stopButton}
+            onClick={onStop}
+            aria-label="Stop generation"
+          >
+            <IconPlayerStopFilled size={14} />
+          </button>
+        ) : (
+          <button
+            type="button"
+            className={classes.sendButton}
+            onClick={handleSubmit}
+            disabled={!hasContent}
+            aria-label="Send message"
+          >
+            <IconArrowUp size={16} stroke={2.5} />
+          </button>
+        )}
+      </div>
+    </div>
+  );
+}

apps/client/src/ee/ai-chat/components/chat-message-list.tsx

@@ -0,0 +1,49 @@
+import { useEffect, useRef } from "react";
+import type { AiChatMessage, AiChatToolCall } from "../types/ai-chat.types";
+import ChatMessage from "./chat-message";
+import classes from "../styles/ai-chat.module.css";
+
+type Props = {
+  messages: AiChatMessage[];
+  isStreaming: boolean;
+  streamingContent: string;
+  streamingToolCalls: AiChatToolCall[];
+};
+
+export default function ChatMessageList({
+  messages,
+  isStreaming,
+  streamingContent,
+  streamingToolCalls,
+}: Props) {
+  const bottomRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    bottomRef.current?.scrollIntoView({ behavior: "smooth" });
+  }, [messages.length, streamingContent, streamingToolCalls.length]);
+
+  return (
+    <div className={classes.messageList}>
+      {messages.map((msg) => (
+        <ChatMessage key={msg.id} message={msg} />
+      ))}
+      {isStreaming && (
+        <ChatMessage
+          message={{
+            id: "streaming",
+            chatId: "",
+            role: "assistant",
+            content: null,
+            toolCalls: null,
+            metadata: null,
+            createdAt: new Date().toISOString(),
+          }}
+          isStreaming
+          streamingContent={streamingContent}
+          streamingToolCalls={streamingToolCalls}
+        />
+      )}
+      <div ref={bottomRef} />
+    </div>
+  );
+}

apps/client/src/ee/ai-chat/components/chat-message.tsx

@@ -0,0 +1,108 @@
+import { useCallback } from "react";
+import { useNavigate } from "react-router";
+import DOMPurify from "dompurify";
+import { IconFile, IconLoader2, IconPhoto } from "@tabler/icons-react";
+import { markdownToHtml } from "@docmost/editor-ext";
+import type { AiChatMessage, AiChatToolCall } from "../types/ai-chat.types";
+import ChatToolResult from "./chat-tool-result";
+import classes from "../styles/chat-message.module.css";
+
+const IMAGE_EXTENSIONS = ["png", "jpg", "jpeg", "webp", "gif"];
+
+type Props = {
+  message: AiChatMessage;
+  isStreaming?: boolean;
+  streamingContent?: string;
+  streamingToolCalls?: AiChatToolCall[];
+};
+
+export default function ChatMessage({
+  message,
+  isStreaming,
+  streamingContent,
+  streamingToolCalls,
+}: Props) {
+  const navigate = useNavigate();
+
+  const handleContentClick = useCallback(
+    (e: React.MouseEvent<HTMLDivElement>) => {
+      const target = e.target as HTMLElement;
+      const anchor = target.closest("a");
+      if (!anchor) return;
+
+      const href = anchor.getAttribute("href");
+      if (href && (href.startsWith("/s/") || href.startsWith("/p/"))) {
+        e.preventDefault();
+        navigate(href);
+      }
+    },
+    [navigate],
+  );
+
+  if (message.role === "tool") return null;
+
+  const isUser = message.role === "user";
+  const content = isStreaming ? streamingContent : message.content;
+  const toolCalls = isStreaming ? streamingToolCalls : message.toolCalls;
+
+  if (isUser) {
+    const displayContent = (content || "").replace(
+      /\n\n<referenced_pages>[\s\S]*<\/referenced_pages>$/,
+      "",
+    );
+    const attachments = (message.metadata?.attachments as { id: string; fileName: string; fileExt: string }[]) || [];
+
+    return (
+      <div className={classes.userMessage}>
+        <div className={classes.userBubble}>
+          {attachments.length > 0 && (
+            <div className={classes.messageAttachments}>
+              {attachments.map((a) => (
+                <span key={a.id} className={classes.messageAttachmentChip}>
+                  {IMAGE_EXTENSIONS.includes(a.fileExt) ? (
+                    <IconPhoto size={13} />
+                  ) : (
+                    <IconFile size={13} />
+                  )}
+                  {a.fileName}
+                </span>
+              ))}
+            </div>
+          )}
+          {displayContent}
+        </div>
+      </div>
+    );
+  }
+
+  return (
+    <div className={classes.assistantMessage}>
+      <div className={classes.messageContent}>
+        {toolCalls?.map((tc) => (
+          <ChatToolResult key={tc.id} toolCall={tc} />
+        ))}
+        {content && (
+          <div
+            onClick={handleContentClick}
+            dangerouslySetInnerHTML={{
+              __html: DOMPurify.sanitize(
+                markdownToHtml(content) as string,
+              ),
+            }}
+          />
+        )}
+        {isStreaming && (
+          <>
+            {!content && (
+              <span className={classes.processingIndicator}>
+                <IconLoader2 size={16} className={classes.processingSpinner} />
+                Thinking
+              </span>
+            )}
+            <span className={classes.streamingCursor} />
+          </>
+        )}
+      </div>
+    </div>
+  );
+}

apps/client/src/ee/ai-chat/components/chat-tool-result.tsx

@@ -0,0 +1,49 @@
+import { useState } from "react";
+import { IconChevronRight, IconChevronDown, IconTool } from "@tabler/icons-react";
+import type { AiChatToolCall } from "../types/ai-chat.types";
+import classes from "../styles/chat-message.module.css";
+
+const TOOL_LABELS: Record<string, string> = {
+  list_spaces: "Listed spaces",
+  search_pages: "Searched pages",
+  get_page: "Read page",
+  create_page: "Created page",
+  update_page: "Updated page",
+};
+
+type Props = {
+  toolCall: AiChatToolCall;
+};
+
+export default function ChatToolResult({ toolCall }: Props) {
+  const [expanded, setExpanded] = useState(false);
+  const label = TOOL_LABELS[toolCall.name] || toolCall.name;
+
+  return (
+    <div className={classes.toolCallCard}>
+      <div
+        className={classes.toolCallHeader}
+        onClick={() => setExpanded((prev) => !prev)}
+      >
+        <IconTool size={14} stroke={1.5} />
+        <span className={classes.toolCallName}>{label}</span>
+        {expanded ? (
+          <IconChevronDown size={14} />
+        ) : (
+          <IconChevronRight size={14} />
+        )}
+      </div>
+      {expanded && (
+        <div className={classes.toolCallDetails}>
+          <pre style={{ margin: 0, whiteSpace: "pre-wrap" }}>
+            {JSON.stringify(
+              { args: toolCall.args, result: toolCall.result },
+              null,
+              2,
+            )}
+          </pre>
+        </div>
+      )}
+    </div>
+  );
+}

apps/client/src/ee/ai-chat/components/enable-ai-chat.tsx

@@ -0,0 +1,60 @@
+import { Group, Text, Switch } from "@mantine/core";
+import { useAtom } from "jotai";
+import { workspaceAtom } from "@/features/user/atoms/current-user-atom.ts";
+import { useState } from "react";
+import { useTranslation } from "react-i18next";
+import { updateWorkspace } from "@/features/workspace/services/workspace-service.ts";
+import { notifications } from "@mantine/notifications";
+import { isCloud } from "@/lib/config.ts";
+import useLicense from "@/ee/hooks/use-license.tsx";
+
+export default function EnableAiChat() {
+  const { t } = useTranslation();
+
+  return (
+    <Group justify="space-between" wrap="nowrap" gap="xl">
+      <div>
+        <Text size="md">{t("AI Chat")}</Text>
+        <Text size="sm" c="dimmed">
+          {t(
+            "Enable AI Chat to allow users to have multi-turn conversations with AI about your workspace content.",
+          )}
+        </Text>
+      </div>
+
+      <AiChatToggle />
+    </Group>
+  );
+}
+
+function AiChatToggle() {
+  const { t } = useTranslation();
+  const [workspace, setWorkspace] = useAtom(workspaceAtom);
+  const [checked, setChecked] = useState(workspace?.settings?.ai?.chat);
+  const { hasLicenseKey } = useLicense();
+
+  const hasAccess = isCloud() || (!isCloud() && hasLicenseKey);
+
+  const handleChange = async (event: React.ChangeEvent<HTMLInputElement>) => {
+    const value = event.currentTarget.checked;
+    try {
+      const updatedWorkspace = await updateWorkspace({ aiChat: value } as any);
+      setChecked(value);
+      setWorkspace(updatedWorkspace);
+    } catch (err: any) {
+      notifications.show({
+        message: err?.response?.data?.message,
+        color: "red",
+      });
+    }
+  };
+
+  return (
+    <Switch
+      defaultChecked={checked}
+      onChange={handleChange}
+      disabled={!hasAccess}
+      aria-label={t("Toggle AI Chat")}
+    />
+  );
+}

apps/client/src/ee/ai-chat/hooks/use-chat-stream.ts

@@ -0,0 +1,182 @@
+import { useState, useCallback, useRef } from "react";
+import { useQueryClient } from "@tanstack/react-query";
+import { useNavigate } from "react-router-dom";
+import { sendChatMessage } from "../services/ai-chat-service";
+import type {
+  AiChatMessage,
+  AiChatStreamEvent,
+  AiChatToolCall,
+  ChatAttachment,
+  PageMention,
+} from "../types/ai-chat.types";
+
+export function useChatStream(chatId: string | undefined) {
+  const [messages, setMessages] = useState<AiChatMessage[]>([]);
+  const [streamingContent, setStreamingContent] = useState("");
+  const [streamingToolCalls, setStreamingToolCalls] = useState<AiChatToolCall[]>(
+    [],
+  );
+  const [isStreaming, setIsStreaming] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const abortRef = useRef<AbortController | null>(null);
+  const queryClient = useQueryClient();
+  const navigate = useNavigate();
+  const currentChatIdRef = useRef(chatId);
+  currentChatIdRef.current = chatId;
+
+  const initMessages = useCallback((msgs: AiChatMessage[]) => {
+    setMessages(msgs);
+  }, []);
+
+  const sendMessage = useCallback(
+    (content: string, mentions: PageMention[] = [], attachments: ChatAttachment[] = []) => {
+      if (isStreaming || (!content.trim() && attachments.length === 0)) return;
+
+      setError(null);
+      setIsStreaming(true);
+      setStreamingContent("");
+      setStreamingToolCalls([]);
+
+      const metadata: Record<string, unknown> = {};
+      if (mentions.length) {
+        metadata.mentionedPageIds = mentions.map((m) => m.id);
+      }
+      if (attachments.length) {
+        metadata.attachments = attachments.map((a) => ({
+          id: a.id,
+          fileName: a.fileName,
+          fileExt: a.fileExt,
+        }));
+      }
+
+      const userMessage: AiChatMessage = {
+        id: `temp-${Date.now()}`,
+        chatId: currentChatIdRef.current || "",
+        role: "user",
+        content,
+        toolCalls: null,
+        metadata: Object.keys(metadata).length ? metadata : null,
+        createdAt: new Date().toISOString(),
+      };
+
+      setMessages((prev) => [...prev, userMessage]);
+
+      const attachmentIds = attachments.map((a) => a.id);
+
+      const abortController = sendChatMessage(
+        {
+          chatId: currentChatIdRef.current,
+          content,
+          mentionedPageIds: mentions.map((m) => m.id),
+          ...(attachmentIds.length && { attachmentIds }),
+        },
+        (event: AiChatStreamEvent) => {
+          switch (event.type) {
+            case "chat_created":
+              currentChatIdRef.current = event.chatId;
+              navigate(`/ai/chat/${event.chatId}`, { replace: true });
+              queryClient.invalidateQueries({ queryKey: ["ai-chats"] });
+              break;
+            case "content":
+              setStreamingContent((prev) => prev + event.text);
+              break;
+            case "tool_call":
+              setStreamingToolCalls((prev) => [
+                ...prev,
+                {
+                  id: event.id,
+                  name: event.name,
+                  args: event.args,
+                },
+              ]);
+              break;
+            case "tool_result":
+              setStreamingToolCalls((prev) =>
+                prev.map((tc) =>
+                  tc.id === event.id ? { ...tc, result: event.result } : tc,
+                ),
+              );
+              break;
+            case "done": {
+              setStreamingContent((currentContent) => {
+                setStreamingToolCalls((currentToolCalls) => {
+                  const assistantMessage: AiChatMessage = {
+                    id: event.messageId,
+                    chatId: currentChatIdRef.current || "",
+                    role: "assistant",
+                    content: currentContent || null,
+                    toolCalls: currentToolCalls.length
+                      ? currentToolCalls
+                      : null,
+                    metadata: event.usage ? { tokenUsage: event.usage } : null,
+                    createdAt: new Date().toISOString(),
+                  };
+
+                  setMessages((prev) => [...prev, assistantMessage]);
+                  return [];
+                });
+                return "";
+              });
+              setIsStreaming(false);
+              queryClient.invalidateQueries({
+                queryKey: ["ai-chat", currentChatIdRef.current],
+              });
+              break;
+            }
+            case "error":
+              setError(event.message);
+              setIsStreaming(false);
+              break;
+          }
+        },
+        (errorMsg) => {
+          setError(errorMsg);
+          setIsStreaming(false);
+        },
+        () => {
+          setIsStreaming(false);
+        },
+      );
+
+      abortRef.current = abortController;
+    },
+    [isStreaming, navigate, queryClient],
+  );
+
+  const stopGeneration = useCallback(() => {
+    abortRef.current?.abort();
+    abortRef.current = null;
+
+    setStreamingContent((currentContent) => {
+      setStreamingToolCalls((currentToolCalls) => {
+        if (currentContent || currentToolCalls.length > 0) {
+          const partialMessage: AiChatMessage = {
+            id: `stopped-${Date.now()}`,
+            chatId: currentChatIdRef.current || "",
+            role: "assistant",
+            content: currentContent || null,
+            toolCalls: currentToolCalls.length ? currentToolCalls : null,
+            metadata: null,
+            createdAt: new Date().toISOString(),
+          };
+          setMessages((prev) => [...prev, partialMessage]);
+        }
+        return [];
+      });
+      return "";
+    });
+
+    setIsStreaming(false);
+  }, []);
+
+  return {
+    messages,
+    streamingContent,
+    streamingToolCalls,
+    isStreaming,
+    error,
+    sendMessage,
+    stopGeneration,
+    initMessages,
+  };
+}

apps/client/src/ee/ai-chat/pages/ai-chat.tsx

@@ -0,0 +1,10 @@
+import AiChatLayout from "../components/ai-chat-layout";
+import classes from "../styles/ai-chat.module.css";
+
+export default function AiChat() {
+  return (
+    <div className={classes.layout}>
+      <AiChatLayout />
+    </div>
+  );
+}

apps/client/src/ee/ai-chat/queries/ai-chat-query.ts

@@ -0,0 +1,61 @@
+import {
+  useQuery,
+  useMutation,
+  useQueryClient,
+  useInfiniteQuery,
+} from "@tanstack/react-query";
+import {
+  listChats,
+  getChatInfo,
+  deleteChat,
+  updateChatTitle,
+  searchChats,
+} from "../services/ai-chat-service";
+
+export function useChatsQuery() {
+  return useInfiniteQuery({
+    queryKey: ["ai-chats"],
+    queryFn: ({ pageParam }) =>
+      listChats({ cursor: pageParam, limit: 30 }),
+    initialPageParam: undefined as string | undefined,
+    getNextPageParam: (lastPage) =>
+      lastPage.meta.hasNextPage ? lastPage.meta.nextCursor : undefined,
+  });
+}
+
+export function useChatInfoQuery(chatId: string | undefined) {
+  return useQuery({
+    queryKey: ["ai-chat", chatId],
+    queryFn: () => getChatInfo(chatId!),
+    enabled: !!chatId,
+  });
+}
+
+export function useDeleteChatMutation() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: (chatId: string) => deleteChat(chatId),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["ai-chats"] });
+    },
+  });
+}
+
+export function useUpdateChatTitleMutation() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: ({ chatId, title }: { chatId: string; title: string }) =>
+      updateChatTitle(chatId, title),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["ai-chats"] });
+    },
+  });
+}
+
+export function useSearchChatsQuery(query: string) {
+  return useQuery({
+    queryKey: ["ai-chats-search", query],
+    queryFn: () => searchChats(query),
+    enabled: query.length > 0,
+  });
+}

apps/client/src/ee/ai-chat/services/ai-chat-service.ts

@@ -0,0 +1,137 @@
+import api from "@/lib/api-client.ts";
+import type {
+  AiChat,
+  AiChatMessage,
+  AiChatStreamEvent,
+  ChatAttachment,
+} from "../types/ai-chat.types";
+import { IPagination } from "@/lib/types.ts";
+
+export async function createChat(): Promise<AiChat> {
+  const req = await api.post<AiChat>("/ai-chat/create");
+  return req.data;
+}
+
+export async function listChats(params?: {
+  limit?: number;
+  cursor?: string;
+}): Promise<IPagination<AiChat>> {
+  const req = await api.post("/ai-chat/list", params);
+  return req.data;
+}
+
+export async function getChatInfo(
+  chatId: string,
+): Promise<{ chat: AiChat; messages: AiChatMessage[] }> {
+  const req = await api.post("/ai-chat/info", { chatId });
+  return req.data;
+}
+
+export async function deleteChat(chatId: string): Promise<void> {
+  await api.post("/ai-chat/delete", { chatId });
+}
+
+export async function updateChatTitle(
+  chatId: string,
+  title: string,
+): Promise<void> {
+  await api.post("/ai-chat/update", { chatId, title });
+}
+
+export async function searchChats(query: string): Promise<AiChat[]> {
+  const req = await api.post("/ai-chat/search", { query });
+  return req.data;
+}
+
+export async function uploadChatFile(file: File): Promise<ChatAttachment> {
+  const formData = new FormData();
+  formData.append("file", file);
+  return await api.post("/ai-chat/upload", formData, {
+    headers: { "Content-Type": "multipart/form-data" },
+  });
+}
+
+export function sendChatMessage(
+  params: {
+    chatId?: string;
+    content: string;
+    mentionedPageIds?: string[];
+    attachmentIds?: string[];
+  },
+  onEvent: (event: AiChatStreamEvent) => void,
+  onError?: (error: string) => void,
+  onComplete?: () => void,
+): AbortController {
+  const abortController = new AbortController();
+
+  (async () => {
+    try {
+      const response = await fetch("/api/ai-chat/send", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify(params),
+        signal: abortController.signal,
+        credentials: "include",
+      });
+
+      if (!response.ok) {
+        const errorBody = await response.text();
+        let errorMessage = `HTTP error ${response.status}`;
+        try {
+          const parsed = JSON.parse(errorBody);
+          errorMessage = parsed.message || errorMessage;
+        } catch {
+          // use default
+        }
+        onError?.(errorMessage);
+        return;
+      }
+
+      const reader = response.body?.getReader();
+      const decoder = new TextDecoder();
+
+      if (!reader) {
+        onError?.("Response body is not readable");
+        return;
+      }
+
+      let buffer = "";
+      try {
+        while (true) {
+          const { done, value } = await reader.read();
+          if (done) break;
+
+          buffer += decoder.decode(value, { stream: true });
+          const lines = buffer.split("\n");
+          buffer = lines.pop() || "";
+
+          for (const line of lines) {
+            if (line.startsWith("data: ")) {
+              const data = line.slice(6);
+              if (data === "[DONE]") {
+                onComplete?.();
+                return;
+              }
+              try {
+                const parsed = JSON.parse(data) as AiChatStreamEvent;
+                onEvent(parsed);
+              } catch {
+                // Skip invalid JSON
+              }
+            }
+          }
+        }
+      } finally {
+        reader.releaseLock();
+      }
+
+      onComplete?.();
+    } catch (error: any) {
+      if (error.name !== "AbortError") {
+        onError?.(error.message);
+      }
+    }
+  })();
+
+  return abortController;
+}

apps/client/src/ee/ai-chat/styles/ai-chat.module.css

@@ -0,0 +1,109 @@
+.layout {
+  display: flex;
+  height: 100%;
+  width: 100%;
+}
+
+.main {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  height: calc(100vh - 45px - 2 * var(--mantine-spacing-md));
+  max-width: 900px;
+  margin: 0 auto;
+  width: 100%;
+}
+
+.messageList {
+  flex: 1;
+  overflow-y: auto;
+  padding: var(--mantine-spacing-md) var(--mantine-spacing-lg);
+  scroll-behavior: smooth;
+}
+
+.inputArea {
+  padding: var(--mantine-spacing-xs) var(--mantine-spacing-lg) var(--mantine-spacing-lg);
+}
+
+/* Empty state - Notion AI style centered layout */
+.emptyState {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  padding: var(--mantine-spacing-xl) var(--mantine-spacing-lg);
+}
+
+.emptyStateIcon {
+  width: 48px;
+  height: 48px;
+  margin-bottom: var(--mantine-spacing-lg);
+  color: light-dark(var(--mantine-color-gray-6), var(--mantine-color-dark-2));
+}
+
+.emptyStateTitle {
+  font-size: 1.5rem;
+  font-weight: 600;
+  color: light-dark(var(--mantine-color-gray-8), var(--mantine-color-dark-0));
+  margin-bottom: var(--mantine-spacing-xl);
+  text-align: center;
+}
+
+.emptyStateInput {
+  width: 100%;
+  max-width: 600px;
+  margin-bottom: var(--mantine-spacing-xl);
+  padding: 6px 0;
+}
+
+.suggestionsSection {
+  width: 100%;
+  max-width: 600px;
+}
+
+.suggestionsLabel {
+  font-size: var(--mantine-font-size-xs);
+  font-weight: 500;
+  color: light-dark(var(--mantine-color-gray-5), var(--mantine-color-dark-3));
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+  margin-bottom: var(--mantine-spacing-sm);
+}
+
+.suggestionsGrid {
+  display: grid;
+  grid-template-columns: repeat(2, 1fr);
+  gap: var(--mantine-spacing-sm);
+}
+
+.suggestionCard {
+  display: flex;
+  align-items: flex-start;
+  gap: var(--mantine-spacing-sm);
+  padding: var(--mantine-spacing-sm) var(--mantine-spacing-md);
+  border: 1px solid light-dark(var(--mantine-color-gray-2), var(--mantine-color-dark-5));
+  border-radius: var(--mantine-radius-md);
+  cursor: pointer;
+  background: transparent;
+  transition: background-color 150ms, border-color 150ms;
+  text-align: left;
+  width: 100%;
+
+  @mixin hover {
+    background: light-dark(var(--mantine-color-gray-0), var(--mantine-color-dark-6));
+    border-color: light-dark(var(--mantine-color-gray-3), var(--mantine-color-dark-4));
+  }
+}
+
+.suggestionIcon {
+  flex-shrink: 0;
+  color: light-dark(var(--mantine-color-gray-6), var(--mantine-color-dark-2));
+  margin-top: 1px;
+}
+
+.suggestionText {
+  font-size: var(--mantine-font-size-sm);
+  color: light-dark(var(--mantine-color-gray-7), var(--mantine-color-dark-1));
+  line-height: 1.4;
+}

apps/client/src/ee/ai-chat/styles/chat-input.module.css

@@ -0,0 +1,163 @@
+.inputWrapper {
+  position: relative;
+  border: 1px solid light-dark(var(--mantine-color-gray-3), var(--mantine-color-dark-4));
+  border-radius: 16px;
+  background: light-dark(var(--mantine-color-white), var(--mantine-color-dark-7));
+  box-shadow:
+    0 1px 3px rgba(0, 0, 0, 0.04),
+    0 4px 12px rgba(0, 0, 0, 0.06);
+  transition: border-color 150ms, box-shadow 150ms;
+
+  &:focus-within {
+    border-color: light-dark(var(--mantine-color-gray-4), var(--mantine-color-dark-3));
+    box-shadow:
+      0 1px 3px rgba(0, 0, 0, 0.04),
+      0 4px 16px rgba(0, 0, 0, 0.1);
+  }
+}
+
+.attachmentChips {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+  padding: 10px 14px 0;
+}
+
+.attachmentChip {
+  display: inline-flex;
+  align-items: center;
+  gap: 5px;
+  padding: 4px 8px;
+  border-radius: 8px;
+  background: light-dark(var(--mantine-color-gray-1), var(--mantine-color-dark-6));
+  color: light-dark(var(--mantine-color-gray-7), var(--mantine-color-dark-1));
+  font-size: var(--mantine-font-size-xs);
+  max-width: 200px;
+}
+
+.attachmentChipUploading {
+  opacity: 0.55;
+}
+
+.attachmentChipName {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.attachmentChipRemove {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border: none;
+  background: none;
+  cursor: pointer;
+  padding: 0;
+  margin-left: 2px;
+  color: light-dark(var(--mantine-color-gray-5), var(--mantine-color-dark-3));
+  border-radius: 50%;
+
+  @mixin hover {
+    color: light-dark(var(--mantine-color-gray-8), var(--mantine-color-dark-0));
+  }
+}
+
+.editorContent {
+  overflow: hidden;
+
+  :global(.ProseMirror) {
+    outline: none;
+    border: none;
+    padding: 14px 18px 8px;
+    font-size: 15px;
+    line-height: 1.6;
+    max-height: 200px;
+    overflow-y: auto;
+    min-height: 24px;
+    color: light-dark(var(--mantine-color-gray-9), var(--mantine-color-dark-0));
+  }
+
+  :global(.ProseMirror p) {
+    margin-block-start: 0;
+    margin-block-end: 0;
+  }
+
+  :global(.ProseMirror p.is-editor-empty:first-child::before) {
+    color: light-dark(var(--mantine-color-gray-4), var(--mantine-color-dark-3));
+    content: attr(data-placeholder);
+    float: left;
+    height: 0;
+    pointer-events: none;
+  }
+}
+
+.actions {
+  display: flex;
+  align-items: center;
+  justify-content: flex-end;
+  padding: 4px 12px 10px;
+  gap: var(--mantine-spacing-xs);
+}
+
+.sendButton {
+  width: 28px;
+  height: 28px;
+  min-width: 28px;
+  min-height: 28px;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border: none;
+  cursor: pointer;
+  transition: background-color 150ms, opacity 150ms;
+  background: light-dark(var(--mantine-color-dark-9), var(--mantine-color-gray-0));
+  color: light-dark(var(--mantine-color-white), var(--mantine-color-dark-9));
+
+  &:disabled {
+    opacity: 0.25;
+    cursor: default;
+  }
+
+  @mixin hover {
+    &:not(:disabled) {
+      opacity: 0.85;
+    }
+  }
+}
+
+.attachButton {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border: none;
+  background: none;
+  cursor: pointer;
+  padding: 2px;
+  color: light-dark(var(--mantine-color-gray-5), var(--mantine-color-dark-3));
+  transition: color 150ms;
+
+  @mixin hover {
+    color: light-dark(var(--mantine-color-gray-7), var(--mantine-color-dark-1));
+  }
+}
+
+.stopButton {
+  width: 28px;
+  height: 28px;
+  min-width: 28px;
+  min-height: 28px;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border: 1px solid light-dark(var(--mantine-color-gray-3), var(--mantine-color-dark-4));
+  cursor: pointer;
+  transition: background-color 150ms;
+  background: light-dark(var(--mantine-color-white), var(--mantine-color-dark-6));
+  color: light-dark(var(--mantine-color-gray-7), var(--mantine-color-dark-1));
+
+  @mixin hover {
+    background: light-dark(var(--mantine-color-gray-1), var(--mantine-color-dark-5));
+  }
+}

apps/client/src/ee/ai-chat/styles/chat-message.module.css

@@ -0,0 +1,231 @@
+.message {
+  margin-bottom: var(--mantine-spacing-lg);
+}
+
+.userMessage {
+  composes: message;
+  display: flex;
+  justify-content: flex-end;
+}
+
+.userBubble {
+  max-width: 75%;
+  padding: 10px 16px;
+  border-radius: 18px;
+  background: light-dark(var(--mantine-color-gray-1), var(--mantine-color-dark-6));
+  color: light-dark(var(--mantine-color-gray-9), var(--mantine-color-dark-0));
+  font-size: 15px;
+  line-height: 1.6;
+  word-wrap: break-word;
+  overflow-wrap: break-word;
+}
+
+.userBubble p {
+  margin: 0;
+}
+
+.messageAttachments {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 4px;
+  margin-bottom: 6px;
+}
+
+.messageAttachmentChip {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  padding: 2px 8px;
+  border-radius: 6px;
+  background: light-dark(var(--mantine-color-gray-2), var(--mantine-color-dark-5));
+  color: light-dark(var(--mantine-color-gray-7), var(--mantine-color-dark-2));
+  font-size: var(--mantine-font-size-xs);
+  max-width: 180px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.assistantMessage {
+  composes: message;
+}
+
+.messageContent {
+  font-size: 15px;
+  line-height: 1.7;
+  color: light-dark(var(--mantine-color-gray-8), var(--mantine-color-dark-1));
+  word-wrap: break-word;
+  overflow-wrap: break-word;
+}
+
+.messageContent p {
+  margin: 0 0 0.75em 0;
+}
+
+.messageContent p:last-child {
+  margin-bottom: 0;
+}
+
+.messageContent ul,
+.messageContent ol {
+  margin: 0.5em 0 0.75em 0;
+  padding-left: 1.5em;
+}
+
+.messageContent li {
+  margin-bottom: 0.3em;
+}
+
+.messageContent h1,
+.messageContent h2,
+.messageContent h3 {
+  margin: 1em 0 0.5em 0;
+  font-weight: 600;
+  color: light-dark(var(--mantine-color-gray-9), var(--mantine-color-dark-0));
+}
+
+.messageContent h1 {
+  font-size: 1.4em;
+}
+
+.messageContent h2 {
+  font-size: 1.2em;
+}
+
+.messageContent h3 {
+  font-size: 1.05em;
+}
+
+.messageContent pre {
+  background-color: light-dark(var(--mantine-color-gray-0), var(--mantine-color-dark-7));
+  padding: var(--mantine-spacing-sm) var(--mantine-spacing-md);
+  border-radius: var(--mantine-radius-md);
+  overflow-x: auto;
+  font-size: var(--mantine-font-size-sm);
+  margin: 0.75em 0;
+}
+
+.messageContent code {
+  background-color: light-dark(var(--mantine-color-gray-1), var(--mantine-color-dark-6));
+  padding: 2px 6px;
+  border-radius: 4px;
+  font-size: 0.88em;
+}
+
+.messageContent pre code {
+  background: none;
+  padding: 0;
+}
+
+.messageContent blockquote {
+  border-left: 3px solid light-dark(var(--mantine-color-gray-3), var(--mantine-color-dark-4));
+  padding-left: var(--mantine-spacing-md);
+  margin: 0.75em 0;
+  color: light-dark(var(--mantine-color-gray-7), var(--mantine-color-dark-2));
+}
+
+.messageContent a {
+  color: light-dark(var(--mantine-color-blue-7), var(--mantine-color-blue-4));
+  text-decoration: none;
+
+  @mixin hover {
+    text-decoration: underline;
+  }
+}
+
+.messageContent a[href^="/s/"],
+.messageContent a[href^="/p/"] {
+  color: light-dark(var(--mantine-color-dark-4), var(--mantine-color-dark-1));
+  font-weight: 500;
+  text-decoration: none;
+  cursor: pointer;
+
+  @mixin light {
+    border-bottom: 0.05em solid var(--mantine-color-dark-0);
+  }
+
+  @mixin dark {
+    border-bottom: 0.05em solid var(--mantine-color-dark-2);
+  }
+
+  @mixin hover {
+    text-decoration: none;
+    @mixin light {
+      border-bottom-color: var(--mantine-color-dark-2);
+    }
+    @mixin dark {
+      border-bottom-color: var(--mantine-color-dark-0);
+    }
+  }
+}
+
+.messageContent hr {
+  border: none;
+  border-top: 1px solid light-dark(var(--mantine-color-gray-2), var(--mantine-color-dark-5));
+  margin: 1em 0;
+}
+
+.toolCallCard {
+  margin: var(--mantine-spacing-xs) 0;
+  padding: var(--mantine-spacing-xs) var(--mantine-spacing-sm);
+  border-radius: var(--mantine-radius-sm);
+  border: 1px solid light-dark(var(--mantine-color-gray-3), var(--mantine-color-dark-5));
+  background: light-dark(var(--mantine-color-gray-0), var(--mantine-color-dark-7));
+  font-size: var(--mantine-font-size-xs);
+}
+
+.toolCallHeader {
+  display: flex;
+  align-items: center;
+  gap: var(--mantine-spacing-xs);
+  cursor: pointer;
+  user-select: none;
+}
+
+.toolCallName {
+  font-weight: 600;
+  color: light-dark(var(--mantine-color-blue-7), var(--mantine-color-blue-4));
+}
+
+.toolCallDetails {
+  margin-top: var(--mantine-spacing-xs);
+  padding-top: var(--mantine-spacing-xs);
+  border-top: 1px solid light-dark(var(--mantine-color-gray-2), var(--mantine-color-dark-5));
+}
+
+.processingIndicator {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  color: light-dark(var(--mantine-color-gray-5), var(--mantine-color-dark-3));
+  font-size: var(--mantine-font-size-sm);
+}
+
+.processingSpinner {
+  animation: spin 1s linear infinite;
+}
+
+@keyframes spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+.streamingCursor {
+  display: inline-block;
+  width: 2px;
+  height: 1em;
+  background: light-dark(var(--mantine-color-gray-7), var(--mantine-color-dark-0));
+  animation: blink 1s step-end infinite;
+  vertical-align: text-bottom;
+  margin-left: 1px;
+}
+
+@keyframes blink {
+  50% {
+    opacity: 0;
+  }
+}

apps/client/src/ee/ai-chat/styles/chat-sidebar.module.css

@@ -0,0 +1,78 @@
+.sidebar {
+  height: 100%;
+  width: 100%;
+  padding: var(--mantine-spacing-md);
+  display: flex;
+  flex-direction: column;
+  gap: var(--mantine-spacing-xs);
+}
+
+.header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding-bottom: var(--mantine-spacing-xs);
+}
+
+.title {
+  font-weight: 600;
+  font-size: var(--mantine-font-size-sm);
+}
+
+.searchInput {
+  margin-bottom: var(--mantine-spacing-xs);
+}
+
+.chatList {
+  flex: 1;
+  overflow-y: auto;
+}
+
+.chatItem {
+  display: flex;
+  align-items: center;
+  padding: 8px var(--mantine-spacing-xs);
+  border-radius: var(--mantine-radius-sm);
+  cursor: pointer;
+  text-decoration: none;
+  color: light-dark(var(--mantine-color-gray-7), var(--mantine-color-dark-1));
+  font-size: var(--mantine-font-size-sm);
+  user-select: none;
+  gap: var(--mantine-spacing-xs);
+
+  @mixin hover {
+    background-color: light-dark(
+      var(--mantine-color-gray-1),
+      var(--mantine-color-dark-6)
+    );
+  }
+
+  &[data-active] {
+    background-color: light-dark(
+      var(--mantine-color-gray-2),
+      var(--mantine-color-dark-6)
+    );
+  }
+}
+
+.chatItemTitle {
+  flex: 1;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.chatItemDate {
+  font-size: var(--mantine-font-size-xs);
+  color: light-dark(var(--mantine-color-gray-5), var(--mantine-color-dark-3));
+  white-space: nowrap;
+}
+
+.chatItemActions {
+  opacity: 0;
+  transition: opacity 150ms;
+}
+
+.chatItem:hover .chatItemActions {
+  opacity: 1;
+}

apps/client/src/ee/ai-chat/types/ai-chat.types.ts

@@ -0,0 +1,49 @@
+export type AiChat = {
+  id: string;
+  workspaceId: string;
+  creatorId: string;
+  title: string | null;
+  createdAt: string;
+  updatedAt: string;
+};
+
+export type AiChatToolCall = {
+  id: string;
+  name: string;
+  args: Record<string, unknown>;
+  result?: unknown;
+};
+
+export type AiChatMessage = {
+  id: string;
+  chatId: string;
+  role: 'user' | 'assistant' | 'tool';
+  content: string | null;
+  toolCalls: AiChatToolCall[] | null;
+  metadata: Record<string, unknown> | null;
+  createdAt: string;
+};
+
+export type AiChatStreamEvent =
+  | { type: 'chat_created'; chatId: string }
+  | { type: 'content'; text: string }
+  | { type: 'tool_call'; id: string; name: string; args: Record<string, unknown> }
+  | { type: 'tool_result'; id: string; result: unknown }
+  | { type: 'done'; messageId: string; usage?: Record<string, number> }
+  | { type: 'error'; message: string };
+
+export type PageMention = {
+  id: string;
+  title: string;
+  slugId: string;
+  spaceSlug?: string;
+  icon?: string;
+};
+
+export type ChatAttachment = {
+  id: string;
+  fileName: string;
+  fileExt: string;
+  fileSize: number;
+  mimeType: string;
+};

apps/client/src/ee/ai/pages/ai-settings.tsx

@@ -6,6 +6,7 @@ import useUserRole from "@/hooks/use-user-role.tsx";
 import { useTranslation } from "react-i18next";
 import EnableAiSearch from "@/ee/ai/components/enable-ai-search.tsx";
 import EnableGenerativeAi from "@/ee/ai/components/enable-generative-ai.tsx";
+import EnableAiChat from "@/ee/ai-chat/components/enable-ai-chat.tsx";
 import McpSettings from "@/ee/ai/components/mcp-settings.tsx";
 import { Alert, Stack, Tabs } from "@mantine/core";
 import { IconInfoCircle } from "@tabler/icons-react";
@@ -68,6 +69,7 @@ export default function AiSettings() {
           <Stack gap="md">
             {!isCloud() && <EnableAiSearch />}
             <EnableGenerativeAi />
+            <EnableAiChat />
           </Stack>
         </Tabs.Panel>
 

apps/client/src/features/editor/components/mention/mention-list.tsx

@@ -62,7 +62,7 @@ const MentionList = forwardRef<any, MentionListProps>((props, ref) => {
     query: props.query,
     includeUsers: true,
     includePages: true,
-    spaceId: space.id,
+    spaceId: space?.id,
     limit: props.query ? 10 : 5,
     preload: true,
   });

apps/client/src/features/editor/components/mention/mention-suggestion.ts

@@ -53,8 +53,8 @@ const mentionRenderItems = () => {
       const editorDom = props.editor?.view?.dom;
       const asideEl = editorDom?.closest(".mantine-AppShell-aside");
       const dialogEl = editorDom?.closest("[data-comment-dialog]");
-      const isInCommentContext = !!(asideEl || dialogEl);
+      const chatInput = editorDom?.closest("[data-chat-input]");
-     // const isInCommentContext = !!asideEl;
+      const isInCommentContext = !!(asideEl || dialogEl || chatInput);
 
       component = new ReactRenderer(MentionList, {
         props: { ...props, isInCommentContext },

apps/client/src/features/workspace/types/workspace.types.ts

@@ -44,6 +44,7 @@ export interface IWorkspaceAiSettings {
   search?: boolean;
   generative?: boolean;
   mcp?: boolean;
+  chat?: boolean;
 }
 
 export interface IWorkspaceSharingSettings {

apps/server/src/core/workspace/dto/update-workspace.dto.ts

@@ -46,6 +46,10 @@ export class UpdateWorkspaceDto extends PartialType(CreateWorkspaceDto) {
   @IsBoolean()
   mcpEnabled: boolean;
 
+  @IsOptional()
+  @IsBoolean()
+  aiChat: boolean;
+
   @IsOptional()
   @IsInt()
   @Min(1)

apps/server/src/core/workspace/services/workspace.service.ts

@@ -440,11 +440,26 @@ export class WorkspaceService {
         );
       }
 
+      if (typeof updateWorkspaceDto.aiChat !== 'undefined') {
+        const prev = settingsBefore?.ai?.chat ?? false;
+        if (prev !== updateWorkspaceDto.aiChat) {
+          before.aiChat = prev;
+          after.aiChat = updateWorkspaceDto.aiChat;
+        }
+        await this.workspaceRepo.updateAiSettings(
+          workspaceId,
+          'chat',
+          updateWorkspaceDto.aiChat,
+          trx,
+        );
+      }
+
       delete updateWorkspaceDto.restrictApiToAdmins;
       delete updateWorkspaceDto.aiSearch;
       delete updateWorkspaceDto.generativeAi;
       delete updateWorkspaceDto.disablePublicSharing;
       delete updateWorkspaceDto.mcpEnabled;
+      delete updateWorkspaceDto.aiChat;
 
       await this.workspaceRepo.updateWorkspace(
         updateWorkspaceDto,

apps/server/src/database/migrations/20260305T120000-ai-chat.ts

@@ -0,0 +1,60 @@
+import { type Kysely, sql } from 'kysely';
+
+export async function up(db: Kysely<any>): Promise<void> {
+  await db.schema
+    .createTable('ai_chats')
+    .addColumn('id', 'uuid', (col) =>
+      col.primaryKey().defaultTo(sql`gen_uuid_v7()`),
+    )
+    .addColumn('workspace_id', 'uuid', (col) =>
+      col.references('workspaces.id').onDelete('cascade').notNull(),
+    )
+    .addColumn('creator_id', 'uuid', (col) =>
+      col.references('users.id').notNull(),
+    )
+    .addColumn('title', 'varchar', (col) => col)
+    .addColumn('created_at', 'timestamptz', (col) =>
+      col.notNull().defaultTo(sql`now()`),
+    )
+    .addColumn('updated_at', 'timestamptz', (col) =>
+      col.notNull().defaultTo(sql`now()`),
+    )
+    .execute();
+
+  await db.schema
+    .createIndex('idx_ai_chats_workspace_creator')
+    .on('ai_chats')
+    .columns(['workspace_id', 'creator_id', 'id'])
+    .execute();
+
+  await db.schema
+    .createTable('ai_chat_messages')
+    .addColumn('id', 'uuid', (col) =>
+      col.primaryKey().defaultTo(sql`gen_uuid_v7()`),
+    )
+    .addColumn('chat_id', 'uuid', (col) =>
+      col.references('ai_chats.id').onDelete('cascade').notNull(),
+    )
+    .addColumn('workspace_id', 'uuid', (col) =>
+      col.references('workspaces.id').onDelete('cascade').notNull(),
+    )
+    .addColumn('role', 'varchar', (col) => col.notNull())
+    .addColumn('content', 'text', (col) => col)
+    .addColumn('tool_calls', 'jsonb', (col) => col)
+    .addColumn('metadata', 'jsonb', (col) => col)
+    .addColumn('created_at', 'timestamptz', (col) =>
+      col.notNull().defaultTo(sql`now()`),
+    )
+    .execute();
+
+  await db.schema
+    .createIndex('idx_ai_chat_messages_chat_id')
+    .on('ai_chat_messages')
+    .columns(['chat_id', 'id'])
+    .execute();
+}
+
+export async function down(db: Kysely<any>): Promise<void> {
+  await db.schema.dropTable('ai_chat_messages').execute();
+  await db.schema.dropTable('ai_chats').execute();
+}

apps/server/src/database/repos/attachment/attachment.repo.ts

@@ -44,6 +44,21 @@ export class AttachmentRepo {
       .executeTakeFirst();
   }
 
+  async findByIdWithContent(
+    attachmentId: string,
+    opts?: {
+      trx?: KyselyTransaction;
+    },
+  ): Promise<Attachment> {
+    const db = dbOrTx(this.db, opts?.trx);
+
+    return db
+      .selectFrom('attachments')
+      .select([...this.baseFields, 'textContent'])
+      .where('id', '=', attachmentId)
+      .executeTakeFirst();
+  }
+
   async insertAttachment(
     insertableAttachment: InsertableAttachment,
     trx?: KyselyTransaction,

apps/server/src/database/types/db.d.ts

@@ -429,7 +429,29 @@ export interface PagePermissions {
   updatedAt: Generated<Timestamp>;
 }
 
+export interface AiChats {
+  id: Generated<string>;
+  workspaceId: string;
+  creatorId: string;
+  title: string | null;
+  createdAt: Generated<Timestamp>;
+  updatedAt: Generated<Timestamp>;
+}
+
+export interface AiChatMessages {
+  id: Generated<string>;
+  chatId: string;
+  workspaceId: string;
+  role: string;
+  content: string | null;
+  toolCalls: Json | null;
+  metadata: Json | null;
+  createdAt: Generated<Timestamp>;
+}
+
 export interface DB {
+  aiChats: AiChats;
+  aiChatMessages: AiChatMessages;
   apiKeys: ApiKeys;
   attachments: Attachments;
   audit: Audit;

apps/server/src/database/types/entity.types.ts

@@ -1,5 +1,7 @@
 import { Insertable, Selectable, Updateable } from 'kysely';
 import {
+  AiChats,
+  AiChatMessages,
   Attachments,
   Comments,
   Groups,
@@ -28,6 +30,15 @@ import {
 } from './db';
 import { PageEmbeddings } from '@docmost/db/types/embeddings.types';
 
+// AI Chat
+export type AiChat = Selectable<AiChats>;
+export type InsertableAiChat = Insertable<AiChats>;
+export type UpdatableAiChat = Updateable<Omit<AiChats, 'id'>>;
+
+// AI Chat Message
+export type AiChatMessage = Selectable<AiChatMessages>;
+export type InsertableAiChatMessage = Insertable<AiChatMessages>;
+
 // Workspace
 export type Workspace = Selectable<Workspaces>;
 export type InsertableWorkspace = Insertable<Workspaces>;

apps/server/src/integrations/environment/environment.service.ts

@@ -252,6 +252,13 @@ export class EnvironmentService {
     return this.configService.get<string>('AI_COMPLETION_MODEL');
   }
 
+  getAiChatModel(): string {
+    return (
+      this.configService.get<string>('AI_CHAT_MODEL') ||
+      this.configService.get<string>('AI_COMPLETION_MODEL')
+    );
+  }
+
   getAiEmbeddingDimension(): number {
     return parseInt(
       this.configService.get<string>('AI_EMBEDDING_DIMENSION'),