refactor: move biz logic to core

frontend/src/app/workspace/chats/[thread_id]/page.tsx

@@ -1,11 +1,8 @@
 "use client";
 
-import { type HumanMessage } from "@langchain/core/messages";
-import { useQueryClient } from "@tanstack/react-query";
 import { useParams, useRouter } from "next/navigation";
 import { useCallback, useEffect, useMemo, useState } from "react";
 
-import type { PromptInputMessage } from "@/components/ai-elements/prompt-input";
 import { BreadcrumbItem } from "@/components/ui/breadcrumb";
 import { InputBox } from "@/components/workspace/input-box";
 import { MessageList } from "@/components/workspace/message-list/message-list";
@@ -17,13 +14,12 @@ import {
 } from "@/components/workspace/workspace-container";
 import { useLocalSettings } from "@/core/settings";
 import { type AgentThread } from "@/core/threads";
-import { useThreadStream } from "@/core/threads/hooks";
-import { titleOfThread } from "@/core/threads/utils";
+import { useSubmitThread, useThreadStream } from "@/core/threads/hooks";
+import { pathOfThread, titleOfThread } from "@/core/threads/utils";
 import { uuid } from "@/core/utils/uuid";
 
 export default function ChatPage() {
   const router = useRouter();
-  const queryClient = useQueryClient();
   const { thread_id: threadIdFromPath } = useParams<{ thread_id: string }>();
   const isNewThread = useMemo(
     () => threadIdFromPath === "new",
@@ -43,40 +39,15 @@ export default function ChatPage() {
     isNewThread,
     threadId,
   });
-  const handleSubmit = useCallback(
-    async (message: PromptInputMessage) => {
-      const text = message.text.trim();
-      if (isNewThread) {
-        router.replace(`/workspace/chats/${threadId}`);
-      }
-      await thread.submit(
-        {
-          messages: [
-            {
-              type: "human",
-              content: [
-                {
-                  type: "text",
-                  text,
-                },
-              ],
-            },
-          ] as HumanMessage[],
-        },
-        {
-          threadId: isNewThread ? threadId! : undefined,
-          streamSubgraphs: true,
-          streamResumable: true,
-          context: {
-            ...threadContext,
-            thread_id: threadId!,
-          },
-        },
-      );
-      void queryClient.invalidateQueries({ queryKey: ["threads", "search"] });
+  const handleSubmit = useSubmitThread({
+    isNewThread,
+    threadId,
+    thread,
+    threadContext,
+    afterSubmit() {
+      router.push(pathOfThread(threadId!));
     },
-    [isNewThread, queryClient, router, thread, threadContext, threadId],
-  );
+  });
   const handleStop = useCallback(async () => {
     await thread.stop();
   }, [thread]);

frontend/src/components/workspace/message-list/message-list-item.tsx

@@ -5,6 +5,7 @@ import {
   Message as AIElementMessage,
   MessageContent as AIElementMessageContent,
   MessageResponse as AIElementMessageResponse,
+  MessageToolbar,
 } from "@/components/ai-elements/message";
 import {
   extractContentFromMessage,
@@ -15,6 +16,7 @@ import { useRehypeSplitWordsIntoSpans } from "@/core/rehype";
 import { cn } from "@/lib/utils";
 
 import { MessageGroup } from "./message-group";
+import { CopyButton } from "../copy-button";
 
 export function MessageListItem({
   className,
@@ -38,6 +40,17 @@ export function MessageListItem({
         messagesInGroup={messagesInGroup}
         isLoading={isLoading}
       />
+      <MessageToolbar
+        className={cn(
+          message.type === "human" && "justify-end",
+          message.type === "human" ? "-bottom-9" : "-bottom-8",
+          "absolute right-0 left-0 z-20 opacity-0 transition-opacity delay-200 duration-300 group-hover/conversation-message:opacity-100",
+        )}
+      >
+        <div className="flex gap-1">
+          <CopyButton clipboardData={extractContentFromMessage(message)} />
+        </div>
+      </MessageToolbar>
     </AIElementMessage>
   );
 }

frontend/src/components/workspace/message-list/message-list.tsx

@@ -31,7 +31,7 @@ export function MessageList({
       <ConversationContent className="mx-auto w-full max-w-(--container-width-md)">
         {groupMessages(
           thread.messages,
-          (groupedMessages, groupIndex, isLastGroup) => {
+          (groupedMessages) => {
             if (groupedMessages[0] && hasContent(groupedMessages[0])) {
               const message = groupedMessages[0];
               return (

frontend/src/components/workspace/recent-chat-list.tsx

@@ -57,7 +57,7 @@ export function RecentChatList() {
         <SidebarMenu>
           <div className="flex w-full flex-col gap-1">
             {threads.map((thread) => {
-              const isActive = pathOfThread(thread, false) === pathname;
+              const isActive = pathOfThread(thread.thread_id) === pathname;
               return (
                 <SidebarMenuItem
                   key={thread.thread_id}
@@ -67,7 +67,7 @@ export function RecentChatList() {
                     <div>
                       <Link
                         className="text-muted-foreground block w-full whitespace-nowrap group-hover/side-menu-item:overflow-hidden"
-                        href={pathOfThread(thread)}
+                        href={pathOfThread(thread.thread_id)}
                       >
                         {titleOfThread(thread)}
                       </Link>

frontend/src/core/threads/hooks.ts

@@ -22,16 +22,37 @@ export function useThreadStream({
   threadId: string | null | undefined;
 }) {
   const queryClient = useQueryClient();
-  return useStream<AgentThreadState>({
+  const thread = useStream<AgentThreadState>({
     client: getAPIClient(),
     assistantId: "lead_agent",
     threadId: isNewThread ? undefined : threadId,
     reconnectOnMount: true,
     fetchStateHistory: true,
-    onFinish() {
-      void queryClient.invalidateQueries({ queryKey: ["threads", "search"] });
+    onFinish(state) {
+      // void queryClient.invalidateQueries({ queryKey: ["threads", "search"] });
+      queryClient.setQueriesData(
+        {
+          queryKey: ["threads", "search"],
+          exact: false,
+        },
+        (oldData: Array<AgentThread>) => {
+          return oldData.map((t) => {
+            if (t.thread_id === threadId) {
+              return {
+                ...t,
+                values: {
+                  ...t.values,
+                  title: state.values.title,
+                },
+              };
+            }
+            return t;
+          });
+        },
+      );
     },
   });
+  return thread;
 }
 
 export function useSubmitThread({
@@ -39,43 +60,47 @@ export function useSubmitThread({
   thread,
   threadContext,
   isNewThread,
-  message,
+  afterSubmit,
 }: {
   isNewThread: boolean;
-  threadId: string;
+  threadId: string | null | undefined;
   thread: UseStream<AgentThreadState>;
-  threadContext: AgentThreadContext;
-  message: PromptInputMessage;
+  threadContext: Omit<AgentThreadContext, "thread_id">;
+  afterSubmit?: () => void;
 }) {
   const queryClient = useQueryClient();
-  const text = message.text.trim();
-  const callback = useCallback(async () => {
-    await thread.submit(
-      {
-        messages: [
-          {
-            type: "human",
-            content: [
-              {
-                type: "text",
-                text,
-              },
-            ],
-          },
-        ] as HumanMessage[],
-      },
-      {
-        threadId: isNewThread ? threadId : undefined,
-        streamSubgraphs: true,
-        streamResumable: true,
-        context: {
-          ...threadContext,
-          thread_id: threadId,
+  const callback = useCallback(
+    async (message: PromptInputMessage) => {
+      const text = message.text.trim();
+      await thread.submit(
+        {
+          messages: [
+            {
+              type: "human",
+              content: [
+                {
+                  type: "text",
+                  text,
+                },
+              ],
+            },
+          ] as HumanMessage[],
         },
-      },
-    );
-    void queryClient.invalidateQueries({ queryKey: ["threads", "search"] });
-  }, [queryClient, thread, threadContext, threadId, isNewThread, text]);
+        {
+          threadId: isNewThread ? threadId! : undefined,
+          streamSubgraphs: true,
+          streamResumable: true,
+          context: {
+            ...threadContext,
+            thread_id: threadId,
+          },
+        },
+      );
+      void queryClient.invalidateQueries({ queryKey: ["threads", "search"] });
+      afterSubmit?.();
+    },
+    [thread, isNewThread, threadId, threadContext, queryClient, afterSubmit],
+  );
   return callback;
 }
 
@@ -86,12 +111,11 @@ export function useThreads(
     sortOrder: "desc",
   },
 ) {
-  const langGraphClient = getAPIClient();
+  const apiClient = getAPIClient();
   return useQuery<AgentThread[]>({
     queryKey: ["threads", "search", params],
     queryFn: async () => {
-      const response =
-        await langGraphClient.threads.search<AgentThreadState>(params);
+      const response = await apiClient.threads.search<AgentThreadState>(params);
       return response as AgentThread[];
     },
   });
@@ -99,10 +123,10 @@ export function useThreads(
 
 export function useDeleteThread() {
   const queryClient = useQueryClient();
-  const langGraphClient = getAPIClient();
+  const apiClient = getAPIClient();
   return useMutation({
     mutationFn: async ({ threadId }: { threadId: string }) => {
-      await langGraphClient.threads.delete(threadId);
+      await apiClient.threads.delete(threadId);
     },
     onSuccess(_, { threadId }) {
       queryClient.setQueriesData(