improve canvas agent session handling

components/canvas/CanvasChatPanel.tsx

@@ -1650,6 +1650,7 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
   const hasInitializedChatStateRef = useRef(false);
   const sessionMenuRef = useRef<HTMLDivElement>(null);
   const historyScrollTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+  const forceHistoryHydrationRef = useRef<string | null>(null);
   
   // 🆕 标签悬停预览状态
   const [tagPreview, setTagPreview] = useState<TagPreviewInfo | null>(null);
@@ -1680,34 +1681,83 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
     unitCost: number;
     imageCount: number;
   } | null>(null);
-  const [streamImageGenerationState, setStreamImageGenerationState] =
+  const [streamImageGenerationStateByChatId, setStreamImageGenerationStateByChatId] =
-    useState<ImageGenerationStatusStreamPayload | null>(null);
+    useState<Record<string, ImageGenerationStatusStreamPayload | null>>({});
+  const streamImageGenerationState = useMemo(
+    () => streamImageGenerationStateByChatId[activeChatId] || null,
+    [activeChatId, streamImageGenerationStateByChatId]
+  );
   const imageParamsRef = useRef(imageParams);
   const videoParamsRef = useRef(videoParams);
   const deepThinkingEnabledRef = useRef(deepThinkingEnabled);
   const imageAutoTitleCacheRef = useRef<Map<string, string>>(new Map());
-  const sendGuardRef = useRef<{
+  const sendGuardRef = useRef<Record<string, {
     inFlight: boolean;
     signature: string;
     timestamp: number;
-  }>({
+  }>>({});
-    inFlight: false,
-    signature: "",
-    timestamp: 0,
-  });
   const storyboardNodeMapRef = useRef<Record<string, Record<number, string>>>({});
-  const releaseSendGuard = useCallback(() => {
+  const getSendGuard = useCallback((chatSessionId: string) => {
-    sendGuardRef.current.inFlight = false;
+    return (
+      sendGuardRef.current[chatSessionId] || {
+        inFlight: false,
+        signature: "",
+        timestamp: 0,
+      }
+    );
   }, []);
 
-  const shouldBlockDuplicateSend = useCallback((signature: string) => {
+  const setSendGuard = useCallback(
+    (
+      chatSessionId: string,
+      next: {
+        inFlight: boolean;
+        signature: string;
+        timestamp: number;
+      }
+    ) => {
+      sendGuardRef.current[chatSessionId] = next;
+    },
+    []
+  );
+
+  const releaseSendGuard = useCallback(
+    (chatSessionId: string) => {
+      sendGuardRef.current[chatSessionId] = {
+        ...getSendGuard(chatSessionId),
+        inFlight: false,
+      };
+    },
+    [getSendGuard]
+  );
+
+  const setStreamImageGenerationStateForChat = useCallback(
+    (chatSessionId: string, next: ImageGenerationStatusStreamPayload | null) => {
+      setStreamImageGenerationStateByChatId((prev) => ({
+        ...prev,
+        [chatSessionId]: next,
+      }));
+    },
+    []
+  );
+
+  const clearStreamImageGenerationStateForChat = useCallback((chatSessionId: string) => {
+    setStreamImageGenerationStateByChatId((prev) => {
+      if (!(chatSessionId in prev)) return prev;
+      const next = { ...prev };
+      delete next[chatSessionId];
+      return next;
+    });
+  }, []);
+
+  const shouldBlockDuplicateSend = useCallback((chatSessionId: string, signature: string) => {
     const now = Date.now();
-    const previous = sendGuardRef.current;
+    const previous = getSendGuard(chatSessionId);
     return (
       previous.signature === signature &&
       now - previous.timestamp < 4500
     );
-  }, []);
+  }, [getSendGuard]);
 
   const handleTypewriterActiveChange = useCallback((typingKey: string, active: boolean) => {
     setActiveTypingSections((prev) => {
@@ -2941,9 +2991,21 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
       ? "视频"
       : activeComposerMode === "detail"
         ? "AI详情"
-      : activeComposerMode === "image"
+        : activeComposerMode === "image"
-        ? "生图"
+          ? "生图"
-        : "Agent";
+          : "Agent";
+  const shouldMaskAgentRuntimeModelName =
+    activeComposerMode === "agent" || selectedModelId === "auto";
+  const getAgentSafeModelName = useCallback(
+    (modelName?: string | null) => {
+      const normalized = String(modelName || "").trim();
+      if (!shouldMaskAgentRuntimeModelName) {
+        return normalized || undefined;
+      }
+      return normalized ? "agent model" : "agent model";
+    },
+    [shouldMaskAgentRuntimeModelName]
+  );
   
   // 默认选择模型（根据系统设置）
   useEffect(() => {
@@ -3426,7 +3488,6 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
     setMessages,
     sendMessage,
     status,
-    stop,
   } = useChat<ChatMessage>({
     id: activeChatId,
     messages: mergedInitialMessages,
@@ -3494,13 +3555,13 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
             typeof dataPart.data === "string" ? JSON.parse(dataPart.data) : dataPart.data;
           if (!payload || typeof payload !== "object") return;
           if (payload.phase === "completed") {
-            setStreamImageGenerationState(null);
+            clearStreamImageGenerationStateForChat(activeChatId);
             return;
           }
-          setStreamImageGenerationState({
+          setStreamImageGenerationStateForChat(activeChatId, {
             phase: payload.phase || "processing",
             providerType: payload.providerType,
-            modelName: payload.modelName,
+            modelName: getAgentSafeModelName(payload.modelName),
             imageCount: Number(payload.imageCount || 0) || undefined,
           });
         } catch (e) {
@@ -3543,28 +3604,59 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
                   part.text.includes("<!-- IMAGE_GENERATION_END -->")
               )
             : false;
-          if (hasImageGenStartMarker) {
-            setStreamImageGenerationState((prev) => ({
-              phase: "processing",
-              providerType:
-                prev?.providerType ||
-                (activeComposerMode === "agent" ? "alibaba-image" : currentModel?.providerType),
-              modelName:
-                prev?.modelName ||
-                (activeComposerMode === "agent"
-                  ? "智能处理"
-                  : currentModel?.displayName || undefined),
-              imageCount:
-                prev?.imageCount || Math.max(1, Number(imageParamsRef.current?.imageCount || 1)),
-            }));
-          }
-          if (hasImageGenEndMarker) {
-            setStreamImageGenerationState(null);
-          }
           const normalizedParts = Array.isArray(messageData.parts) ? messageData.parts : [];
           const normalizedAttachments = Array.isArray(messageData.attachments)
             ? messageData.attachments
             : [];
+          const emptyNearestUserImageKeys = new Set<string>();
+          const incomingImageUrls = normalizedParts.flatMap((part: any) =>
+            part?.type === "text" && typeof part?.text === "string"
+              ? extractAssistantImageUrls(part.text, emptyNearestUserImageKeys)
+              : typeof part?.url === "string" && /^https?:\/\//i.test(part.url)
+                ? [part.url]
+                : []
+          );
+          const incomingVideoUrls = normalizedParts.flatMap((part: any) =>
+            part?.type === "text" && typeof part?.text === "string"
+              ? extractVideoUrls(part.text)
+              : typeof part?.url === "string" &&
+                  /^https?:\/\//i.test(part.url) &&
+                  /\.(mp4|mov|webm|m4v)(?:[?#].*)?$/i.test(part.url)
+                ? [part.url]
+                : []
+          );
+          normalizedAttachments.forEach((attachment: any) => {
+            const rawUrl = String(attachment?.url || "").trim();
+            if (!rawUrl || !/^https?:\/\//i.test(rawUrl)) return;
+            const contentType = String(attachment?.contentType || "").toLowerCase();
+            if (
+              contentType.startsWith("video/") ||
+              /\.(mp4|mov|webm|m4v)(?:[?#].*)?$/i.test(rawUrl)
+            ) {
+              incomingVideoUrls.push(rawUrl);
+              return;
+            }
+            incomingImageUrls.push(rawUrl);
+          });
+          if (hasImageGenStartMarker) {
+            const previousState =
+              streamImageGenerationStateByChatId[activeChatId] || null;
+            setStreamImageGenerationStateForChat(activeChatId, {
+              phase: "processing",
+              providerType:
+                previousState?.providerType ||
+                (activeComposerMode === "agent" ? "alibaba-image" : currentModel?.providerType),
+              modelName:
+                previousState?.modelName ||
+                getAgentSafeModelName(currentModel?.displayName),
+              imageCount:
+                previousState?.imageCount ||
+                Math.max(1, Number(imageParamsRef.current?.imageCount || 1)),
+            });
+          }
+          if (hasImageGenEndMarker || incomingImageUrls.length > 0 || incomingVideoUrls.length > 0) {
+            clearStreamImageGenerationStateForChat(activeChatId);
+          }
           
           setMessages((prevMessages) => {
             const existingIndex = prevMessages.findIndex(
@@ -3728,6 +3820,8 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
       }
     },
     onError: (error) => {
+      clearStreamImageGenerationStateForChat(activeChatId);
+      releaseSendGuard(activeChatId);
       const fallbackMessage =
         error instanceof Error ? error.message : "生成失败";
       const responseData = (error as any)?.data;
@@ -3757,9 +3851,9 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
 
   useEffect(() => {
     if (status === "ready") {
-      releaseSendGuard();
+      releaseSendGuard(activeChatId);
     }
-  }, [releaseSendGuard, status]);
+  }, [activeChatId, releaseSendGuard, status]);
 
   useEffect(() => {
     const launchPayload = pendingLaunchRef.current;
@@ -3817,7 +3911,8 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
     }
 
     if (!historyData || !rawChatId) return;
-    if (status === "streaming" || status === "submitted") return;
+    const shouldForceHydrate = forceHistoryHydrationRef.current === rawChatId;
+    if ((status === "streaming" || status === "submitted") && !shouldForceHydrate) return;
 
     const historyMessages = historyData.messages || [];
     const lastMessageId = historyMessages.at(-1)?.id || "none";
@@ -3828,6 +3923,7 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
     loadedHistorySignatureRef.current = signature;
     processedMessageIds.current = new Set();
     hasHydratedHistoryRef.current = true;
+    forceHistoryHydrationRef.current = null;
     setMessages(historyMessages);
     setMessageViewportKey((prev) => prev + 1);
     console.log("[CanvasChat] 已同步历史消息:", historyMessages.length, signature);
@@ -6223,20 +6319,21 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
 
   // 处理发送（图片已在上传时添加到画布，这里只发送消息）
   const handleSend = useCallback(async () => {
-    if (sendGuardRef.current.inFlight || status === "streaming" || status === "submitted") {
+    const currentSendGuard = getSendGuard(activeChatId);
+    if (currentSendGuard.inFlight || status === "streaming" || status === "submitted") {
       return;
     }
 
     if (isDetailGenerationMode && aiDetailGenerationEnabled) {
-      sendGuardRef.current = {
+      setSendGuard(activeChatId, {
         inFlight: true,
         signature: `detail:${activeChatId}:${Date.now()}`,
         timestamp: Date.now(),
-      };
+      });
       try {
         await handleDetailGeneration();
       } finally {
-        releaseSendGuard();
+        releaseSendGuard(activeChatId);
       }
       return;
     }
@@ -6389,17 +6486,17 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
       mode: activeComposerMode,
     });
 
-    if (shouldBlockDuplicateSend(sendSignature)) {
+    if (shouldBlockDuplicateSend(activeChatId, sendSignature)) {
       toast.message("检测到重复发送，已自动忽略");
       return;
     }
 
-      sendGuardRef.current = {
+      setSendGuard(activeChatId, {
         inFlight: true,
         signature: sendSignature,
         timestamp: Date.now(),
-      };
+      });
-      setStreamImageGenerationState(null);
+      clearStreamImageGenerationStateForChat(activeChatId);
 
       // 使用与 multimodal-input 相同的格式发送消息
       try {
@@ -6408,7 +6505,7 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
         parts: parts,
       });
     } catch (error) {
-      releaseSendGuard();
+      releaseSendGuard(activeChatId);
       console.error("[CanvasChat] sendMessage failed:", error);
       toast.error("发送失败，请重试");
       return;
@@ -6448,8 +6545,10 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
     aiDetailGenerationEnabled,
     handleDetailGeneration,
     ensureImagePointsBeforeSend,
-    isVideoModel,
+    getSendGuard,
+    clearStreamImageGenerationStateForChat,
     releaseSendGuard,
+    setSendGuard,
     shouldBlockDuplicateSend,
     status,
   ]);
@@ -7001,20 +7100,23 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
       updatedAt: now,
     };
 
+    releaseSendGuard(activeChatId);
     setChatSessions((prevSessions) => [newSession, ...prevSessions]);
     setActiveChatId(newChatSessionId);
     toast.success("已新建聊天窗口");
-  }, [chatSessions.length]);
+  }, [activeChatId, chatSessions.length, releaseSendGuard]);
 
   const switchToSession = useCallback((sessionId: string) => {
     if (!sessionId || sessionId === activeChatId) {
       setIsSessionMenuOpen(false);
       return;
     }
+    forceHistoryHydrationRef.current = toRawCanvasChatId(sessionId);
+    releaseSendGuard(activeChatId);
     setActiveChatId(sessionId);
     setIsSessionMenuOpen(false);
     toast.success("已切换聊天窗口");
-  }, [activeChatId]);
+  }, [activeChatId, releaseSendGuard]);
 
   const activeSessionTitle = useMemo(() => {
     const current = chatSessions.find((session) => session.id === activeChatId);